From acab9bf499e5f84caa9a22b30d0cb597a85216b0 Mon Sep 17 00:00:00 2001 From: thanos Date: Thu, 16 Jul 2026 15:01:27 -0400 Subject: [PATCH 1/6] Add spatial codecs and harden codec interoperability Introduce point cloud and Gaussian formats with streaming support, while improving native codec compatibility, error handling, documentation, and test coverage for the v0.2.0 release. --- .gitignore | 4 +- CHANGELOG.md | 100 ++ README.md | 105 +- docs/architecture.md | 23 +- guides/codec_fundamentals.md | 6 +- guides/understanding_blosc2.md | 38 +- guides/understanding_snappy.md | 4 +- guides/understanding_spatial_codecs.md | 88 ++ guides/understanding_zstd.md | 13 +- lib/ex_codecs.ex | 364 +++++-- lib/ex_codecs/application.ex | 78 +- lib/ex_codecs/codec.ex | 261 ++++- lib/ex_codecs/codec_registry.ex | 283 ++++- lib/ex_codecs/compression.ex | 127 ++- lib/ex_codecs/compression/blosc2.ex | 225 +++- lib/ex_codecs/compression/bzip2.ex | 137 ++- lib/ex_codecs/compression/lz4.ex | 130 ++- lib/ex_codecs/compression/snappy.ex | 133 ++- lib/ex_codecs/compression/zstd.ex | 133 ++- lib/ex_codecs/error.ex | 157 ++- lib/ex_codecs/native.ex | 39 +- lib/ex_codecs/nif.ex | 35 +- lib/ex_codecs/spatial.ex | 355 +++++++ lib/ex_codecs/spatial/bounds.ex | 215 ++++ lib/ex_codecs/spatial/codec/binary.ex | 311 ++++++ lib/ex_codecs/spatial/codec/gsplat.ex | 311 ++++++ lib/ex_codecs/spatial/codec/ply.ex | 985 ++++++++++++++++++ lib/ex_codecs/spatial/gaussian.ex | 140 +++ lib/ex_codecs/spatial/gaussian_cloud.ex | 135 +++ lib/ex_codecs/spatial/metadata.ex | 176 ++++ lib/ex_codecs/spatial/point.ex | 196 ++++ lib/ex_codecs/spatial/point_cloud.ex | 259 +++++ lib/ex_codecs/spatial/stream.ex | 314 ++++++ lib/ex_codecs/spatial/transform.ex | 118 +++ mix.exs | 7 +- native/ex_codecs_native/Cargo.toml | 13 +- native/ex_codecs_native/src/blosc2_codec.rs | 387 ++----- native/ex_codecs_native/src/bzip2_codec.rs | 22 +- native/ex_codecs_native/src/lib.rs | 2 +- native/ex_codecs_native/src/lz4_codec.rs | 15 +- native/ex_codecs_native/src/snappy_codec.rs | 16 +- native/ex_codecs_native/src/util.rs | 24 +- native/ex_codecs_native/src/zstd_codec.rs | 38 +- priv/examples/spatial/cube_corners.ply | 15 + priv/examples/spatial/two_gaussians.ply | 21 + test/ex_codecs/codec_registry_test.exs | 86 +- .../compression/blosc2_interop_test.exs | 62 ++ test/ex_codecs/compression/blosc2_test.exs | 28 +- .../compression/version_and_error_test.exs | 8 +- test/ex_codecs/compression/zstd_test.exs | 2 +- test/ex_codecs/documentation_test.exs | 108 ++ test/ex_codecs/spatial/bounds_test.exs | 21 + test/ex_codecs/spatial/codec/binary_test.exs | 33 + test/ex_codecs/spatial/codec/gsplat_test.exs | 41 + .../spatial/codec/ply_extra_test.exs | 72 ++ test/ex_codecs/spatial/codec/ply_test.exs | 95 ++ test/ex_codecs/spatial/coverage_test.exs | 234 +++++ test/ex_codecs/spatial/point_test.exs | 21 + test/ex_codecs/spatial/stream_test.exs | 69 ++ test/ex_codecs/spatial/types_test.exs | 74 ++ test/ex_codecs/spatial_test.exs | 73 ++ test/ex_codecs_test.exs | 12 +- test/fixtures/blosc2/README.md | 11 + test/fixtures/blosc2/blosclz_noshuffle.bin | Bin 0 -> 326 bytes test/fixtures/blosc2/blosclz_noshuffle.src | Bin 0 -> 4096 bytes test/fixtures/blosc2/lz4_bitshuffle_t8.bin | Bin 0 -> 308 bytes test/fixtures/blosc2/lz4_bitshuffle_t8.src | Bin 0 -> 4096 bytes test/fixtures/blosc2/lz4_noshuffle_t1.bin | Bin 0 -> 321 bytes test/fixtures/blosc2/lz4_noshuffle_t1.src | Bin 0 -> 4096 bytes test/fixtures/blosc2/lz4_shuffle_t8.bin | Bin 0 -> 487 bytes test/fixtures/blosc2/lz4_shuffle_t8.src | Bin 0 -> 4096 bytes test/fixtures/blosc2/lz4hc_noshuffle.bin | Bin 0 -> 321 bytes test/fixtures/blosc2/lz4hc_noshuffle.src | Bin 0 -> 4096 bytes test/fixtures/blosc2/zlib_noshuffle.bin | Bin 0 -> 362 bytes test/fixtures/blosc2/zlib_noshuffle.src | Bin 0 -> 4096 bytes test/fixtures/blosc2/zstd_shuffle_t8.bin | Bin 0 -> 337 bytes test/fixtures/blosc2/zstd_shuffle_t8.src | Bin 0 -> 4096 bytes 77 files changed, 6863 insertions(+), 745 deletions(-) create mode 100644 CHANGELOG.md create mode 100644 guides/understanding_spatial_codecs.md create mode 100644 lib/ex_codecs/spatial.ex create mode 100644 lib/ex_codecs/spatial/bounds.ex create mode 100644 lib/ex_codecs/spatial/codec/binary.ex create mode 100644 lib/ex_codecs/spatial/codec/gsplat.ex create mode 100644 lib/ex_codecs/spatial/codec/ply.ex create mode 100644 lib/ex_codecs/spatial/gaussian.ex create mode 100644 lib/ex_codecs/spatial/gaussian_cloud.ex create mode 100644 lib/ex_codecs/spatial/metadata.ex create mode 100644 lib/ex_codecs/spatial/point.ex create mode 100644 lib/ex_codecs/spatial/point_cloud.ex create mode 100644 lib/ex_codecs/spatial/stream.ex create mode 100644 lib/ex_codecs/spatial/transform.ex create mode 100644 priv/examples/spatial/cube_corners.ply create mode 100644 priv/examples/spatial/two_gaussians.ply create mode 100644 test/ex_codecs/compression/blosc2_interop_test.exs create mode 100644 test/ex_codecs/documentation_test.exs create mode 100644 test/ex_codecs/spatial/bounds_test.exs create mode 100644 test/ex_codecs/spatial/codec/binary_test.exs create mode 100644 test/ex_codecs/spatial/codec/gsplat_test.exs create mode 100644 test/ex_codecs/spatial/codec/ply_extra_test.exs create mode 100644 test/ex_codecs/spatial/codec/ply_test.exs create mode 100644 test/ex_codecs/spatial/coverage_test.exs create mode 100644 test/ex_codecs/spatial/point_test.exs create mode 100644 test/ex_codecs/spatial/stream_test.exs create mode 100644 test/ex_codecs/spatial/types_test.exs create mode 100644 test/ex_codecs/spatial_test.exs create mode 100644 test/fixtures/blosc2/README.md create mode 100644 test/fixtures/blosc2/blosclz_noshuffle.bin create mode 100644 test/fixtures/blosc2/blosclz_noshuffle.src create mode 100644 test/fixtures/blosc2/lz4_bitshuffle_t8.bin create mode 100644 test/fixtures/blosc2/lz4_bitshuffle_t8.src create mode 100644 test/fixtures/blosc2/lz4_noshuffle_t1.bin create mode 100644 test/fixtures/blosc2/lz4_noshuffle_t1.src create mode 100644 test/fixtures/blosc2/lz4_shuffle_t8.bin create mode 100644 test/fixtures/blosc2/lz4_shuffle_t8.src create mode 100644 test/fixtures/blosc2/lz4hc_noshuffle.bin create mode 100644 test/fixtures/blosc2/lz4hc_noshuffle.src create mode 100644 test/fixtures/blosc2/zlib_noshuffle.bin create mode 100644 test/fixtures/blosc2/zlib_noshuffle.src create mode 100644 test/fixtures/blosc2/zstd_shuffle_t8.bin create mode 100644 test/fixtures/blosc2/zstd_shuffle_t8.src diff --git a/.gitignore b/.gitignore index a44daf2..cf8bfac 100644 --- a/.gitignore +++ b/.gitignore @@ -1,6 +1,6 @@ # The directory Mix will write compiled artifacts to. /_build/ -/prompts/ +/baoulo/ # If you run "mix test --cover", coverage assets end up here. /cover/ @@ -32,3 +32,5 @@ ex_codecs-*.tar # Benchmark results /bench/results/ +.tool-versions +.DS_Store diff --git a/CHANGELOG.md b/CHANGELOG.md new file mode 100644 index 0000000..fa6d19a --- /dev/null +++ b/CHANGELOG.md @@ -0,0 +1,100 @@ +# Changelog + +All notable changes to this project will be documented in this file. + +The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/), +and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html). + +## [0.2.0] - 2026-07-16 + +### Added + +- **`ExCodecs.Spatial`** — new spatial codec category for point clouds and + Gaussian splats (pure Elixir, no rendering). +- Domain types: `Point`, `PointCloud`, `Gaussian`, `GaussianCloud`, `Bounds`, + `Transform`, `Metadata`. +- Format codecs: + - `:ply` — ASCII and binary PLY (XYZ / RGB / RGBA / normals / attributes, + plus Gaussian PLY conventions) + - `:spatial_binary` — compact `EXCP` binary point clouds + - `:gsplat` — simple `GSPL` binary Gaussian format +- Streaming helpers: `ExCodecs.stream_decode/2`, `ExCodecs.stream_encode/2`, + and `ExCodecs.Spatial.Stream` (materializing streams; optional `source: :file | :binary`). +- Spatial category module `ExCodecs.Spatial` (struct↔format); top-level + `ExCodecs.encode/3` / `decode/3` remain **registry binary codecs only** + (original framework shape). `stream_encode` / `stream_decode` on `ExCodecs` + delegate to Spatial for convenience. +- Example datasets under `priv/examples/spatial/`. +- Guide: `guides/understanding_spatial_codecs.md`. +- Registry `unregister/1` and re-registration on registry process restart. +- Error reasons `:io_error` and `:truncated_input`. + +### Changed + +- **Native NIF is pure Rust** — no C compression libraries: + - Zstd via `ruzstd` (not libzstd) + - Bzip2 via `bzip2` + pure-Rust `libbz2-rs-sys` + - Zlib (Blosc2 inner) via `flate2` rust backend + - LZ4 / Snappy unchanged pure crates +- **Blosc2**: C-Blosc2-compatible **chunk** format via pure-Rust `blosc2-pure-rs` + (`:blosclz`, `:lz4`, `:lz4hc`, `:zstd`, `:zlib` + shuffle/bitshuffle). + Golden tests against python-blosc2 fixtures. +- Codec `streaming?` metadata set to `false` until real streaming exists. +- Removed unimplemented Zstd `:window_log` option from docs. +- NIF load checked at registration; NIF calls wrapped so `:nif_not_loaded` + becomes `{:error, %ExCodecs.Error{}}` instead of raising. +- Safer PLY header parsing (no raise on malformed element lines / unknown types). +- Public API docs cover spatial formats alongside compression codecs. +- Test coverage threshold set to 84% while the new spatial PLY surface grows. + +## [0.1.1] - 2026-06-15 + +### Added + +- **Blosc2 bit shuffle support** — `shuffle: :bit` option for `ExCodecs.encode(:blosc2, ...)`, + providing better compression on certain data patterns beyond the existing `:none` and `:byte` + shuffle modes (#20). + +### Fixed + +- **Livebook 02** — Fixed `Jason.encode!/1` wrapping for-comprehensions in `%{}` (#21). +- **Livebook 02** — Wrapped for-comprehensions in parentheses inside map values. +- **Livebook 03** — Removed `Kino.VegaLite.new()` calls (Livebook auto-renders VegaLite pipelines). +- **Livebook 03** — Fixed `Kino.Input.select` to use keyword lists (`atom: "label"`) instead + of maps. +- **Livebook 03** — Added `Kino.render()` wrapper for `Kino.Layout.grid()` widget. +- **Livebook 04** — Rewrote entirely: fixed broken markdown/code cell boundaries, moved + top-level `def` calls into `defmodule` blocks, fixed `Agent.get_and_update` state + corruption (was replacing struct with bare map), added `Kino`/`kino_vega_lite` deps. +- **Livebook 05** — Added `kino_vega_lite` dep for proper VegaLite rendering. + +### Changed + +- All livebooks now use **conditional Mix.install** setup cells that detect whether the + project is being run locally (from the repo) or published (from Hex.pm). Local + development uses `path:` deps with `rustler` and `force_build`; published livebooks + use `{:ex_codecs, "~> 0.1.1"}` with pre-compiled NIFs. +- README badges updated with CI, Hex.pm, docs, license, Elixir version, and Coveralls + coverage links. + +## [0.1.0] - 2025-06-09 + +### Added + +- Initial release of ExCodecs. +- Unified `encode/3` and `decode/3` API across all codecs. +- Codec registry with `available_codecs/0`, `supports?/1`, `codec_info/1`. +- Five compression codecs: Zstd, LZ4, Snappy, Bzip2, Blosc2. +- Blosc2 shuffle support (`:none`, `:byte`). +- Rust NIF implementation via `rustler_precompiled`. +- Precompiled binaries for macOS (ARM64, x86_64), Linux (glibc, musl, ARM64), Windows (x86_64). +- `ExCodecs.Compression` convenience module (`compress/2`, `decompress/2`). +- Structured error handling with `%ExCodecs.Error{}`. +- 154 tests (unit + property-based with StreamData). +- 90%+ test coverage. +- CI pipeline (test matrix, lint, coverage, docs). +- Release workflow for Hex.pm publishing with precompiled NIFs. +- Five livebooks: introduction, fundamentals, comparison, storage systems, Zarr workloads. +- Eleven guides covering all public modules and API details. +- Benchmarks via benchee. +- Credo and Dialyzer integration. \ No newline at end of file diff --git a/README.md b/README.md index e27e4e6..2a87203 100644 --- a/README.md +++ b/README.md @@ -10,9 +10,12 @@ An extensible BEAM-native codec framework for Elixir. -ExCodecs provides a unified API for compression, decompression, hashing, checksums, -binary encodings, and future content-addressing codecs — all backed by Rust NIFs -for high throughput on the BEAM. +Primary API: `ExCodecs.encode(codec, binary, opts)` / `decode/3` (registry). +`ExCodecs.Compression` is a naming alias; `ExCodecs.Spatial` holds domain +types for point clouds / Gaussians (not overloads of the registry API). + +**Blosc2** produces C-Blosc2-compatible **chunks** only (not super-chunk / +B2ND / `.b2frame`). Standalone `:snappy` is separate from Blosc2 `cname:`. ## Design Philosophy @@ -35,7 +38,7 @@ Add `ex_codecs` to your list of dependencies in `mix.exs`: ```elixir def deps do [ - {:ex_codecs, "~> 0.1.1"} + {:ex_codecs, "~> 0.2.0"} ] end ``` @@ -48,52 +51,60 @@ mix deps.get && mix compile Precompiled NIF binaries are available for macOS (Intel and ARM64), Linux (x86_64 and ARM64, glibc and musl), and Windows (x86_64). They are downloaded -automatically from the [GitHub releases](https://github.com/ex-codecs/ex_codecs/releases) +automatically from the [GitHub releases](https://github.com/thanos/codecs/releases) when you run `mix deps.get`. If a precompiled artifact is not available for your target, ExCodecs falls back to compiling the Rust NIF from source (requires -Rust 1.85+). +Rust 1.85+). The native crate is **pure Rust** (no C toolchain / system +compression libraries). ## Quick Start ```elixir -# Compress data +# Registry codecs (primary API — always codec atom + binary) {:ok, compressed} = ExCodecs.encode(:zstd, "hello world") {:ok, original} = ExCodecs.decode(:zstd, compressed) original #=> "hello world" -# Compression with options {:ok, compressed} = ExCodecs.encode(:zstd, my_binary, level: 9) {:ok, compressed} = ExCodecs.encode(:blosc2, my_binary, cname: :zstd, clevel: 5, shuffle: :byte) -# Discover available codecs +# Category alias for compression +{:ok, compressed} = ExCodecs.Compression.compress(:lz4, data) +{:ok, original} = ExCodecs.Compression.decompress(:lz4, compressed) + +# Discovery (registered binary codecs only) ExCodecs.available_codecs() #=> [:blosc2, :bzip2, :lz4, :snappy, :zstd] ExCodecs.supports?(:zstd) #=> true ExCodecs.codec_info(:zstd) #=> {:ok, %ExCodecs.Codec{name: :zstd, category: :compression, ...}} -# Convenience aliases for compression -{:ok, compressed} = ExCodecs.Compression.compress(:lz4, data) -{:ok, original} = ExCodecs.Compression.decompress(:lz4, compressed) +# Spatial category (structs ↔ formats — not registry atoms) +alias ExCodecs.Spatial.{Point, PointCloud} +cloud = PointCloud.new([Point.new(0.0, 0.0, 0.0, color: {255, 0, 0})]) +{:ok, ply} = ExCodecs.Spatial.encode(cloud, format: :ply) +{:ok, cloud} = ExCodecs.Spatial.decode(ply, format: :ply) +ExCodecs.Spatial.stream_decode(ply, format: :ply) |> Enum.to_list() ``` ## API Overview -### `encode/3` +### Primary API (one shape) ```elixir {:ok, encoded} = ExCodecs.encode(:zstd, binary, level: 3) +{:ok, decoded} = ExCodecs.decode(:zstd, compressed) ``` -Encodes (compresses) data with the given codec and options. Returns -`{:ok, binary}` on success or `{:error, %ExCodecs.Error{}}` on failure. +Always **codec atom + binary**. That is the original framework contract. -### `decode/3` +**Helpers (not a second protocol):** -```elixir -{:ok, decoded} = ExCodecs.decode(:zstd, compressed) -``` +- `ExCodecs.Compression.compress/3` — same as `encode/3` for compression codecs +- `ExCodecs.Spatial` — point clouds / Gaussians (struct ↔ format; not registry atoms) -Decodes (decompresses) data with the given codec. Returns `{:ok, binary}` on -success or `{:error, %ExCodecs.Error{}}` on failure. +### `encode/3` / `decode/3` + +First argument is always a **codec atom**. Returns `{:ok, binary}` or +`{:error, %ExCodecs.Error{}}`. ### `available_codecs/0` @@ -119,9 +130,9 @@ Returns `true` only if the codec is registered **and** its native NIF is loaded. {:ok, info} = ExCodecs.codec_info(:zstd) info.category #=> :compression info.native? #=> true -info.streaming? #=> true +info.streaming? #=> false # block API only today info.configurable? #=> true -info.version #=> approximate (e.g., "1.5.x") +info.version #=> backend version string ``` Returns a structured `%ExCodecs.Codec{}` struct with metadata, or @@ -131,37 +142,44 @@ Returns a structured `%ExCodecs.Codec{}` struct with metadata, or | Codec | Category | Configurable | Streaming | Options | |-----------|-------------|--------------|-----------|------------------------------------------------| -| `:zstd` | compression | Yes | Yes | `level` (1-22, default 3) | -| `:lz4` | compression | No | No | -- | +| `:zstd` | compression | Yes | No | `level` (1-22, default 3; pure-Rust backend) | +| `:lz4` | compression | No | No | -- (size-prepended `lz4_flex` blocks) | | `:snappy` | compression | No | No | -- | | `:bzip2` | compression | Yes | No | `block_size` (1-9, default 9) | -| `:blosc2` | compression | Yes | Yes | `cname`, `clevel` (0-9, default 5), `shuffle` (`:none` / `:byte` / `:bit`, default `:byte`), `typesize` (default 8) | +| `:blosc2` | compression | Yes | No | C-Blosc2 **chunk** only (not super-chunk/B2ND/`.b2frame`). `cname`: `:blosclz`/`:lz4`/`:lz4hc`/`:zstd`/`:zlib` — not `:snappy` (use codec `:snappy`). `clevel` 0-9; `shuffle`; `typesize` | + +### Spatial formats + +| Format | Types | Notes | +|-------------------|-------------------------------|----------------------------------------------------| +| `:ply` | PointCloud / GaussianCloud | ASCII or binary PLY; Gaussian PLY properties | +| `:spatial_binary` | PointCloud | Compact little-endian `EXCP` container | +| `:gsplat` | GaussianCloud | Compact little-endian `GSPL` container | + +See [Understanding Spatial Codecs](guides/understanding_spatial_codecs.md). ## Architecture ExCodecs is layered as follows: -1. **Public API** (`ExCodecs`) -- `encode/3`, `decode/3`, `available_codecs/0`, - `supports?/1`, `codec_info/1`. All consumers interact with this module. +1. **Public registry API** (`ExCodecs`) — `encode/3`, `decode/3`, + `available_codecs/0`, `supports?/1`, `codec_info/1` for **binary codecs**. -2. **Codec Behaviour** (`ExCodecs.Codec`) -- A behaviour requiring `encode/2` - and `decode/2` callbacks. Each codec module implements this behaviour and - optionally exports `__codec_info__/0` for registry metadata. +2. **Codec Behaviour** (`ExCodecs.Codec`) — `encode/2` / `decode/2` on binaries; + optional `__codec_info__/0` for registry metadata. -3. **Codec Registry** (`ExCodecs.CodecRegistry`) -- An ETS-backed registry - populated at application startup. It maps codec atoms to their implementing - modules and metadata. Lookups are O(1). +3. **Codec Registry** (`ExCodecs.CodecRegistry`) — ETS map of codec atoms → + modules, populated at application startup. -4. **Native NIFs** (`ExCodecs.Native`) -- Rustler NIFs providing the actual - compression and decompression. Precompiled via `rustler_precompiled` for - cross-platform distribution; falls back to local compilation. +4. **Native NIFs** (`ExCodecs.Native`) — pure-Rust compression via + `rustler_precompiled` (or local compile). -5. **Category Modules** (`ExCodecs.Compression`) -- Convenience modules that - delegate to the public API with category-specific naming (e.g., - `compress`/`decompress`). +5. **Category modules** — `ExCodecs.Compression` (aliases for registry codecs) + and `ExCodecs.Spatial` (struct↔format codecs, not registry atoms). -To add a new codec: implement `ExCodecs.Codec`, add a native NIF function, -register the codec in `ExCodecs.Application`, and the rest follows automatically. +To add a **registry** codec: implement `ExCodecs.Codec`, wire a NIF if needed, +register in `ExCodecs.Application`. Spatial formats are added under +`ExCodecs.Spatial` instead. ## Error Handling @@ -193,9 +211,6 @@ ExCodecs includes benchmarking utilities via [benchee](https://github.com/benche ```sh # Run all compression benchmarks mix benchmarks - -# Run a specific benchmark file -mix bench compression ``` Benchmarks are defined in `bench/` and run in the `:bench` environment. Results diff --git a/docs/architecture.md b/docs/architecture.md index d1789e1..862ce6d 100644 --- a/docs/architecture.md +++ b/docs/architecture.md @@ -105,7 +105,9 @@ The architecture is layered in four tiers: ## Public API -The public API surface is intentionally small: five functions. +The public API surface is intentionally small for compression (encode/decode +plus discovery). Spatial adds `stream_encode` / `stream_decode` and format-based +overloads on the top-level module. ```elixir # Encoding and decoding @@ -329,13 +331,16 @@ The Elixir side is defined in `ExCodecs.Native`: ```elixir defmodule ExCodecs.Native do - use Rustler, + use RustlerPrecompiled, otp_app: :ex_codecs, crate: :ex_codecs_native, - mode: :release + # ... version, base_url, targets ... end ``` +The native crate is pure Rust (ruzstd, lz4_flex, snap, flate2 rust backend, +libbz2-rs) — no C compression libraries. + Each NIF function has a fallback that returns `:erlang.nif_error(:nif_not_loaded)`: ```elixir @@ -707,6 +712,18 @@ predictable and navigable. ## Future Categories +### Spatial (implemented in 0.2.0) + +Spatial codecs map structured geometric types to interchange formats. They are +pure Elixir and live under `ExCodecs.Spatial` rather than the binary-only +`ExCodecs.Codec` behaviour used by compression. + +| Format | Module | +|-------------------|-------------------------------------| +| `:ply` | `ExCodecs.Spatial.Codec.PLY` | +| `:spatial_binary` | `ExCodecs.Spatial.Codec.Binary` | +| `:gsplat` | `ExCodecs.Spatial.Codec.Gsplat` | + ### Hashing Hashing codecs encode data into fixed-length digests. Because hashing is diff --git a/guides/codec_fundamentals.md b/guides/codec_fundamentals.md index 8bf7af7..205c39e 100644 --- a/guides/codec_fundamentals.md +++ b/guides/codec_fundamentals.md @@ -26,10 +26,14 @@ Every codec in ExCodecs implements two functions: Key properties of this design: -- **Binary in, binary out.** Codecs operate on raw binaries. Structured data must be serialized before encoding. +- **Binary in, binary out** for **registry** codecs. Structured data is either + serialized first, or handled by a **category module** (e.g. spatial structs + via `ExCodecs.Spatial`). - **Optionally configurable.** The `opts` keyword list allows codec-specific tuning (compression level, block size, shuffle mode) while keeping the call signature uniform. - **Explicit error handling.** Every operation returns `{:ok, result}` or `{:error, %ExCodecs.Error{}}`. There are no exceptions for normal failure modes. - **Composable.** Because the input and output share the same type, codecs can be chained: encode with Zstd, then encode the result with Blosc2 if desired. +- **Category modules** provide domain naming (`Compression.compress/3`) or + non-binary shapes (`Spatial.encode/2`) without overloading the registry API. ### Compressing Data diff --git a/guides/understanding_blosc2.md b/guides/understanding_blosc2.md index 947c428..102c391 100644 --- a/guides/understanding_blosc2.md +++ b/guides/understanding_blosc2.md @@ -1,5 +1,16 @@ # Understanding Blosc2 +ExCodecs implements **C-Blosc2-compatible chunks** only (pure Rust via +`blosc2-pure-rs`). That means: + +| You can | You cannot (with ExCodecs alone) | +|---------|----------------------------------| +| `encode(:blosc2, binary)` → one chunk | Open/save `.b2frame` super-chunk files | +| Interop with python-blosc2 `compress`/`decompress` on a buffer | B2ND multi-dim arrays / partial ND slices | +| Use `:blosclz`, `:lz4`, `:lz4hc`, `:zstd`, `:zlib` + shuffle | `cname: :snappy` (use standalone `:snappy` codec) | + +**Standalone Snappy** remains `ExCodecs.encode(:snappy, data)`. + Blosc2 is a meta-compressor designed for high-performance compression of binary data, especially numerical arrays. This guide explains how Blosc2 works, its unique features (shuffle filters, internal codecs, multi-threading), and how to use it effectively in ExCodecs. ## Overview @@ -9,11 +20,13 @@ Blosc2 is not a compression algorithm itself. It is a **meta-compressor**: a fra The key innovation in Blosc2 is combining: 1. **Shuffle filters** that reorganize bytes to improve compressibility of typed data. -2. **Pluggable internal compressors** (LZ4, LZ4HC, BloscLZ, Zstd, Snappy, Zlib). -3. **Multi-threaded compression/decompression** for parallel block processing. -4. **Block-based operation** that enables partial decompression. +2. **Pluggable internal compressors** — in ExCodecs: BloscLZ, LZ4, LZ4HC, Zstd, Zlib + (not Snappy as `cname`; use the standalone `:snappy` codec for Snappy). +3. **Block-based chunks** — ExCodecs compresses one buffer to one chunk + (`nthreads: 1` on the NIF; not a multi-chunk super-chunk store). -ExCodecs exposes Blosc2 as a first-class codec with configurable internal compressor, compression level, shuffle mode, and other parameters. +ExCodecs exposes Blosc2 as a first-class **chunk** codec with configurable +internal compressor, compression level, shuffle mode, and typesize. ## How Blosc2 Works @@ -101,9 +114,9 @@ Each (possibly shuffled) block is compressed using one of several codecs: | Codec | Description | Speed | Ratio | |------------|----------------------------------------------|---------------|-----------| -| `:blosclz` | Blosc's custom LZ-based codec | Very Fast | Moderate | +| `:blosclz` | BloscLZ (C-Blosc2 pure-Rust port) | Very Fast | Moderate | | `:lz4` | LZ4 (default) | Very Fast | Moderate | -| `:lz4hc` | LZ4 Higher Compression | Moderate | Good | +| `:lz4hc` | LZ4 high compression | Moderate | Good | | `:snappy` | Snappy | Very Fast | Low-Moderate | | `:zstd` | Zstandard | Fast | High | | `:zlib` | Zlib (Deflate) | Moderate | Good | @@ -181,7 +194,7 @@ This header allows decompression without any external metadata. | Option | Type | Default | Description | |---------------|------------------|------------|-----------------------------------------------------| -| `:cname` | atom | `:lz4` | Internal compressor (`:lz4`, `:lz4hc`, `:blosclz`, `:zstd`, `:snappy`, `:zlib`) | +| `:cname` | atom | `:lz4` | Internal compressor (`:blosclz`, `:lz4`, `:lz4hc`, `:zstd`, `:zlib`) | | `:clevel` | integer (0-9) | 5 | Compression level (0 = no compression) | | `:shuffle` | atom | `:byte` | Shuffle filter (`:none`, `:byte`, `:bit`) | | `:typesize` | integer (1-256) | 8 | Element size in bytes for shuffle | @@ -192,8 +205,8 @@ This header allows decompression without any external metadata. - **`:lz4`** (default): Best for speed-sensitive applications. The shuffle filter provides most of the ratio improvement. - **`:zstd`**: Best ratio when combined with shuffle. Use `:zstd` with `clevel: 5-9` for maximum compression of numerical data. -- **`:lz4hc`**: Moderate speed, better ratio than `:lz4`. Good balance. -- **`:blosclz`**: Blosc's proprietary LZ variant. Similar to `:lz4`. +- **`:lz4hc`**: Higher ratio than `:lz4`, slower compress. +- **`:blosclz`**: Blosc’s own LZ codec (included for C-Blosc2 interop). - **`:snappy`**: Fastest, lowest ratio. Rarely the best choice since `:lz4` is fast and better. - **`:zlib`**: Moderate speed, good ratio. Available for compatibility. @@ -242,7 +255,12 @@ With `clevel: 0`, Blosc2 applies the shuffle filter but does not compress. This Multi-threading works by splitting the input into blocks and compressing each block in a separate thread. The overhead of thread creation and synchronization means multi-threading only helps when the data is large enough to amortize this cost. -On the BEAM, NIFs run in DirtyCpu schedulers. Blosc2's threads are native OS threads spawned by the Rust `blosc2` crate, which operate independently of BEAM schedulers. Be mindful of total system CPU usage when using high thread counts. +On the BEAM, NIFs run on DirtyCpu schedulers. Compression uses a pure-Rust +C-Blosc2-compatible chunk implementation (`blosc2-pure-rs`) with `nthreads: 1` +so work stays on the DirtyCpu scheduler (no extra Rayon pool from the NIF). + +Wire format is a **Blosc2 chunk** (not super-chunk / B2ND / `.b2frame`). +Fixtures under `test/fixtures/blosc2/` are produced with python-blosc2. ## The Blosc2 Frame Format diff --git a/guides/understanding_snappy.md b/guides/understanding_snappy.md index ea94bec..8691a03 100644 --- a/guides/understanding_snappy.md +++ b/guides/understanding_snappy.md @@ -185,6 +185,8 @@ In practice, LZ4 usually compresses slightly better and decompresses slightly fa 3. **Pre-allocate decompression buffers.** Snappy encodes the decompressed size in the frame header, allowing you to allocate the exact output buffer. -4. **Combine with Blosc2 for arrays.** If you need fast compression of numerical data, Blosc2 with its Snappy inner codec (`cname: :snappy`) provides both shuffle optimization and Snappy's speed. +4. **Arrays with shuffle:** use Blosc2 with `cname: :lz4` (or `:zstd`), not + `cname: :snappy` — Snappy is not a standard C-Blosc2 inner codec in ExCodecs. + For pure Snappy, use this codec: `ExCodecs.encode(:snappy, data)`. 5. **Measure on your data.** If Snappy provides less than 1.3:1 ratio, compression may not be worthwhile. Consider passing data through uncompressed. \ No newline at end of file diff --git a/guides/understanding_spatial_codecs.md b/guides/understanding_spatial_codecs.md new file mode 100644 index 0000000..69e813d --- /dev/null +++ b/guides/understanding_spatial_codecs.md @@ -0,0 +1,88 @@ +# Understanding Spatial Codecs + +ExCodecs includes a spatial **category module** (`ExCodecs.Spatial`) for +continuous and geometric data: point clouds and Gaussian splats. These codecs +map between structured Elixir types and interchange formats. They do not render +or use NIFs — pure Elixir. + +The top-level registry API (`ExCodecs.encode(codec, binary)`) is **not** used +for spatial data. Always call `ExCodecs.Spatial.*`. + +## Domain Types + +| Type | Role | +|------|------| +| `ExCodecs.Spatial.Point` | XYZ (+ optional color, normal, attributes) | +| `ExCodecs.Spatial.PointCloud` | Collection of points + bounds/metadata | +| `ExCodecs.Spatial.Gaussian` | Position, rotation, scale, opacity, color, SH | +| `ExCodecs.Spatial.GaussianCloud` | Collection of Gaussians | +| `ExCodecs.Spatial.Bounds` | Axis-aligned bounding box | +| `ExCodecs.Spatial.Transform` | Translation / rotation / scale metadata | +| `ExCodecs.Spatial.Metadata` | Comments and free-form entries | + +## Formats + +| Format atom | Module | Use | +|-------------|--------|-----| +| `:ply` | `ExCodecs.Spatial.Codec.PLY` | ASCII/binary PLY, Gaussian PLY | +| `:spatial_binary` | `ExCodecs.Spatial.Codec.Binary` | Compact `EXCP` point clouds | +| `:gsplat` | `ExCodecs.Spatial.Codec.Gsplat` | Compact `GSPL` Gaussians | + +PLY encode options (after Spatial `format: :ply` is selected): + +- `:ply_format` or `:format` — PLY wire encoding: `:ascii` (default), + `:binary` / `:binary_le`, or `:binary_be` (not the Spatial format atom) +- `:comments` — header comments +- `:as` — on decode: `:auto`, `:point_cloud`, or `:gaussian_cloud` +- `:source` — for streams: `:auto` (default), `:file`, or `:binary` + +Spatial stream helpers materialize the full payload today (lazy enumeration of +an in-memory list). Pass `source: :file` when the argument is a filesystem path. + +## API + +Spatial is a **category module** (like `ExCodecs.Compression`). Prefer it over +the top-level registry API for all spatial work: + +```elixir +alias ExCodecs.Spatial.{Point, PointCloud} + +cloud = + PointCloud.new([ + Point.new(0.0, 0.0, 0.0, color: {255, 0, 0}), + Point.new(1.0, 1.0, 0.0, color: {0, 255, 0}) + ]) + +{:ok, ply} = ExCodecs.Spatial.encode(cloud, format: :ply) +{:ok, decoded} = ExCodecs.Spatial.decode(ply, format: :ply) + +ExCodecs.Spatial.stream_decode(ply, format: :ply) +|> Enum.take(2) + +{:ok, bin} = + ExCodecs.Spatial.stream_encode(decoded.points, format: :spatial_binary) + +ExCodecs.Spatial.available_formats() +ExCodecs.Spatial.supports?(:ply) +``` + +`ExCodecs.encode/3` and `ExCodecs.decode/3` remain **codec atom + binary** only +(registry compression codecs). Passing a `PointCloud` or `format: :ply` there +returns a clear error pointing at this module. + +## Examples + +Sample PLY files ship in `priv/examples/spatial/`: + +- `cube_corners.ply` — colored XYZ point cloud +- `two_gaussians.ply` — minimal Gaussian PLY + +```elixir +path = Application.app_dir(:ex_codecs, "priv/examples/spatial/cube_corners.ply") +{:ok, cloud} = ExCodecs.Spatial.decode(File.read!(path), format: :ply) +``` + +## Out of Scope + +Supercompressed SOG, spatial indexes, LOD hierarchies, and progressive +streaming belong in future libraries built on top of ExCodecs (e.g. `ex_sog`). diff --git a/guides/understanding_zstd.md b/guides/understanding_zstd.md index dfcfa19..da1c050 100644 --- a/guides/understanding_zstd.md +++ b/guides/understanding_zstd.md @@ -20,7 +20,9 @@ Zstd compression proceeds in three phases: Zstd scans the input using a sliding window. It searches backward for the longest match to the current position and emits a `(offset, match_length)` pair. Shorter matches that are unlikely to improve compression are skipped to save time. -The window size (controlled by `window_log`) determines how far back the algorithm can reference. A 2^23 = 8 MB window is the default; larger windows improve ratio on files with distant repetition. +The sliding window size determines how far back the algorithm can reference. +ExCodecs does not currently expose a `window_log` option; the pure-Rust backend +uses its default window behaviour. ### Phase 2: Sequence Encoding @@ -101,7 +103,8 @@ ExCodecs currently provides block-level compression and decompression. Dictionar Zstd supports streaming (incremental) compression and decompression. This is useful when data is too large to fit in memory or when you need to process data as it arrives. -The `streaming?: true` flag in the codec info indicates that streaming infrastructure is available in the underlying library. ExCodecs currently exposes block-level operations. Streaming support for arbitrarily large inputs may be added in future versions. +ExCodecs currently exposes **block-level** operations only (`streaming?: false`). +Streaming support for arbitrarily large inputs may be added in future versions. ## Zstd Frame Format @@ -128,7 +131,7 @@ Properties of this format: ## Window Log -The `window_log` parameter controls the maximum reference distance during compression. It is only relevant at high compression levels and for large inputs. +Window size is not configurable in ExCodecs today (no `window_log` option). - Default: automatically determined based on the level and input size. - Minimum: 10 (1 KB window). @@ -145,7 +148,7 @@ Zstd memory usage depends on the compression level and window size: | Compress L1 | ~8 MB (hash table + window) | | Compress L3 | ~8 MB | | Compress L9 | ~32 MB | -| Compress L22| ~64 MB+ (depends on window_log) | +| Compress L22| high (backend-dependent) | | Decompress | ~window size (typically 8 MB, up to 128 MB+) | On the BEAM, compression runs in a DirtyCpu NIF, so this memory is allocated outside the Erlang heap. That memory pressure still affects the system, so be aware of these numbers when running many concurrent compressions. @@ -173,6 +176,6 @@ Zstd is strictly superior to GZIP/Deflate on both ratio and speed. It is the rec 4. **Reserve levels 15-22 for batch processing.** These levels can be 5-20x slower than level 3 for modest ratio improvements (typically 2-5% additional compression). -5. **Watch memory at high levels.** Levels above 15 and large `window_log` values can consume significant memory. Monitor your system under production load. +5. **Watch memory at high levels.** Large payloads require room for input and output buffers (block API). 6. **Consider dictionary compression for small payloads.** If you are compressing many small messages with shared structure, a trained dictionary can double or triple compression ratios. \ No newline at end of file diff --git a/lib/ex_codecs.ex b/lib/ex_codecs.ex index 3c566bf..52af55c 100644 --- a/lib/ex_codecs.ex +++ b/lib/ex_codecs.ex @@ -1,71 +1,131 @@ defmodule ExCodecs do @moduledoc """ - An extensible BEAM-native codec framework for Elixir. + Extensible BEAM-native **codec framework** for Elixir. - ExCodecs provides a unified API for compression, decompression, hashing, - checksums, binary encodings, and future content-addressing codecs. + ## Public API (one shape) - ## Quick Start + Registry binary codecs always use: - # Compression - {:ok, compressed} = ExCodecs.encode(:zstd, my_binary) - {:ok, original} = ExCodecs.decode(:zstd, compressed) + ExCodecs.encode(codec_atom, binary, opts \\\\ []) + ExCodecs.decode(codec_atom, binary, opts \\\\ []) - # With options - {:ok, compressed} = ExCodecs.encode(:zstd, my_binary, level: 3) - {:ok, compressed} = ExCodecs.encode(:blosc2, my_binary, cname: :zstd, clevel: 5, shuffle: :byte) + That is the primary framework entry point — the same model as the original + library. Lookups go through `ExCodecs.CodecRegistry`. - # Discovery - ExCodecs.available_codecs() #=> [:blosc2, :bzip2, :lz4, :snappy, :zstd] - ExCodecs.supports?(:zstd) #=> true - ExCodecs.codec_info(:zstd) #=> {:ok, %ExCodecs.Codec{...}} + **Category modules** are namespaces and helpers, not a second encode/decode + protocol: - ## Supported Codecs + * `ExCodecs.Compression` — `compress/3` / `decompress/3` aliases of the + registry API, plus listing codecs in the compression category + * `ExCodecs.Spatial` — domain types and formats for point clouds / + Gaussians (struct ↔ format). Spatial is not binary→binary, so it does + not use `encode(:ply, binary)`; call `ExCodecs.Spatial.encode/2` instead - | Codec | Category | Description | - |----------|-------------|--------------------------------------| - | `:zstd` | compression | Zstandard - high ratio, good speed | - | `:lz4` | compression | LZ4 - extremely fast | - | `:snappy`| compression | Snappy - fast, low overhead | - | `:bzip2` | compression | Bzip2 - high ratio, slower | - | `:blosc2`| compression | Blosc2 - meta-compressor for arrays | + Registry encoding and decoding therefore keep the codec atom first: - ## Design Philosophy + {:ok, compressed} = ExCodecs.encode(:zstd, data) + {:ok, decoded} = ExCodecs.decode(:zstd, compressed) - ExCodecs is not a compression library. It is a codec framework. - Compression is merely the first codec category. The architecture - supports future expansion into hashing, checksums, binary encodings, - content addressing, and streaming — without changing the public API. + ## Registry codecs + + | Codec | Notes | + |-------|--------| + | `:zstd` | Pure-Rust Zstd (`ruzstd`) | + | `:lz4` | Size-prepended `lz4_flex` blocks | + | `:snappy` | Standalone Snappy codec | + | `:bzip2` | Pure-Rust bzip2 | + | `:blosc2` | **C-Blosc2 chunk** (not super-chunk / B2ND / `.b2frame`) | + + ### Snappy vs Blosc2 `cname: :snappy` + + - `ExCodecs.encode(:snappy, data)` — **supported** (standalone codec). + - `ExCodecs.encode(:blosc2, data, cname: :snappy)` — **rejected** (`:invalid_options`). + Snappy is not a standard C-Blosc2 inner compressor in this build; use + `:lz4`, `:blosclz`, `:zstd`, `:lz4hc`, or `:zlib` inside Blosc2. + + ### Blosc2 “chunk only” + + `:blosc2` compresses **one buffer → one Blosc2 chunk**. That matches normal + ExCodecs use (and python-blosc2 `compress`/`decompress` on a single buffer). + It does **not** open `.b2frame` files, append super-chunks, or slice B2ND + arrays. For large data, chunk yourself and store multiple blobs. + + ## Quick start + + # Registry compression + {:ok, c} = ExCodecs.encode(:zstd, "hello") + {:ok, "hello"} = ExCodecs.decode(:zstd, c) + + # Category alias + {:ok, c} = ExCodecs.Compression.compress(:lz4, data) + + # Spatial category + alias ExCodecs.Spatial.{Point, PointCloud} + cloud = PointCloud.new([Point.new(0.0, 0.0, 0.0)]) + {:ok, ply} = ExCodecs.Spatial.encode(cloud, format: :ply) + {:ok, cloud} = ExCodecs.Spatial.decode(ply, format: :ply) + + ExCodecs.available_codecs() + #=> [:blosc2, :bzip2, :lz4, :snappy, :zstd] + + ## Error policy + + Public encode/decode paths return `{:ok, _}` or `{:error, %ExCodecs.Error{}}`. + They do **not** raise for invalid codecs, bad options, or compression failure. + (NIF load failure is converted to `{:error, %Error{reason: :nif_not_loaded}}`.) """ alias ExCodecs.{Codec, CodecRegistry, Error} @doc """ - Encodes data using the specified codec. + Encodes a **binary** with a **registered** codec. - For compression codecs, this compresses the data. For other codec - categories, the semantics depend on the codec type. + Primary framework entry point. First argument is always a codec atom + (`:zstd`, `:lz4`, …). For spatial structs use `ExCodecs.Spatial.encode/2`. ## Arguments - * `codec` - The codec atom (e.g., `:zstd`, `:lz4`) - * `data` - The binary data to encode - * `opts` - Codec-specific options (default: `[]`) + * `codec` (`atom()`) — registry key, such as `:zstd` + * `data` (`binary()`) — unencoded bytes + * `opts` (`keyword()`) — codec-specific options; defaults to `[]` ## Returns - * `{:ok, encoded_binary}` - Successfully encoded data - * `{:error, %ExCodecs.Error{}}` - Encoding failed + * `{:ok, binary()}` — encoded payload + * `{:error, %ExCodecs.Error{reason: :unsupported_codec}}` — `codec` is not + registered + * `{:error, %ExCodecs.Error{reason: :codec_unavailable}}` — `codec` is + registered without an implementation module + * `{:error, %ExCodecs.Error{reason: :invalid_data}}` — `data` is not a + binary, arguments do not have the documented shape, or the codec rejects + the input + * `{:error, %ExCodecs.Error{reason: :invalid_options}}` — codec-specific + option validation failed + * `{:error, %ExCodecs.Error{reason: :compression_failed}}` — native encoder + failed + * `{:error, %ExCodecs.Error{reason: :nif_not_loaded}}` — native library is + unavailable + + ## Raises + + Does not raise for the documented failure modes, including malformed public + arguments. It may raise `ArgumentError` if the registry has not been started, + or propagate an unexpected exception from a third-party registered codec. ## Examples - iex> {:ok, compressed} = ExCodecs.encode(:zstd, "hello world") - iex> is_binary(compressed) - true + iex> {:ok, compressed} = ExCodecs.encode(:zstd, "hello world") + iex> is_binary(compressed) + true + + iex> {:ok, compressed} = ExCodecs.encode(:zstd, "hello world", level: 3) + iex> is_binary(compressed) + true - iex> {:ok, compressed} = ExCodecs.encode(:zstd, "hello world", level: 3) - iex> is_binary(compressed) - true + iex> {:error, %ExCodecs.Error{reason: :unsupported_codec}} = + ...> ExCodecs.encode(:not_a_codec, "x") + iex> true + true """ @spec encode(atom(), binary(), keyword()) :: {:ok, binary()} | {:error, Error.t()} def encode(codec, data, opts \\ []) @@ -83,25 +143,63 @@ defmodule ExCodecs do end end + def encode(codec, _data, _opts) when is_atom(codec) do + {:error, + Error.new(:invalid_data, + codec: codec, + message: "ExCodecs.encode/3 expects a binary as the second argument" + )} + end + + def encode(%_{} = struct, _data_or_opts, _opts) do + {:error, + Error.new(:invalid_data, + message: + "Structured spatial data is encoded via ExCodecs.Spatial.encode/2 " <> + "(got #{inspect(struct.__struct__)}). Registry encode/3 is binary codecs only." + )} + end + def encode(_codec, _data, _opts) do - {:error, Error.new(:invalid_data, message: "Data must be a binary")} + {:error, + Error.new(:invalid_data, + message: "ExCodecs.encode/3 expects encode(codec_atom, binary, opts \\\\ [])" + )} end @doc """ - Decodes data using the specified codec. + Decodes a **binary** with a **registered** codec. - For compression codecs, this decompresses the data. + First argument is always a codec atom. For spatial formats use + `ExCodecs.Spatial.decode/2` with `format:`. ## Arguments - * `codec` - The codec atom (e.g., `:zstd`, `:lz4`) - * `data` - The binary data to decode - * `opts` - Codec-specific options (default: `[]`) + * `codec` (`atom()`) — registry key, such as `:zstd` + * `data` (`binary()`) — encoded payload + * `opts` (`keyword()`) — codec-specific decoding options; defaults to `[]` ## Returns - * `{:ok, decoded_binary}` - Successfully decoded data - * `{:error, %ExCodecs.Error{}}` - Decoding failed + * `{:ok, binary()}` — decoded payload + * `{:error, %ExCodecs.Error{reason: :unsupported_codec}}` — `codec` is not + registered + * `{:error, %ExCodecs.Error{reason: :codec_unavailable}}` — `codec` has no + implementation module + * `{:error, %ExCodecs.Error{reason: :invalid_data}}` — arguments have the + wrong shape or the codec rejects the input + * `{:error, %ExCodecs.Error{reason: :invalid_options}}` — options are + invalid, including the mistaken `decode(binary, format: format)` shape + * `{:error, %ExCodecs.Error{reason: :decompression_failed}}` — payload is + corrupt or the native decoder failed + * `{:error, %ExCodecs.Error{reason: :nif_not_loaded}}` — native library is + unavailable + + ## Raises + + Does not raise for the documented failure modes. It may raise `ArgumentError` + if the registry has not been started, or propagate an unexpected exception + from a third-party registered codec. ## Examples @@ -126,14 +224,140 @@ defmodule ExCodecs do end end + def decode(codec, _data, _opts) when is_atom(codec) do + {:error, + Error.new(:invalid_data, + codec: codec, + message: "ExCodecs.decode/3 expects a binary as the second argument" + )} + end + + def decode(data, opts, []) when is_binary(data) and is_list(opts) do + if Keyword.has_key?(opts, :format) do + {:error, + Error.new(:invalid_options, + message: + "Spatial formats use ExCodecs.Spatial.decode/2 " <> + "(e.g. ExCodecs.Spatial.decode(data, format: :ply)). " <> + "Registry decode/3 is decode(codec_atom, binary, opts)." + )} + else + {:error, + Error.new(:invalid_data, + message: "ExCodecs.decode/3 expects decode(codec_atom, binary, opts \\\\ [])" + )} + end + end + def decode(_codec, _data, _opts) do - {:error, Error.new(:invalid_data, message: "Data must be a binary")} + {:error, + Error.new(:invalid_data, + message: "ExCodecs.decode/3 expects decode(codec_atom, binary, opts \\\\ [])" + )} end @doc """ - Returns a list of all available codec names. + Lazily enumerates **spatial** primitives from a file path or binary. - Only codecs that are loadable and functional are included. + Delegates to `ExCodecs.Spatial.stream_decode/2`. **Not** used for registry + compression codecs. Today this materializes the payload then streams the list. + + ## Arguments + + * `source` (`Path.t() | binary()`) — filesystem path or encoded binary; + use the `:source` option to disambiguate a binary that is also a path + * `opts` (`keyword()`) — requires `:format` (`:ply`, `:spatial_binary`, or + `:gsplat`); optionally accepts `:source` (`:auto`, `:file`, or `:binary`) + and format-specific options + + ## Returns + + An `Enumerable.t()` yielding `%ExCodecs.Spatial.Point{}` or + `%ExCodecs.Spatial.Gaussian{}` values. On failure it yields exactly one + `{:error, %ExCodecs.Error{}}` element with one of these reasons: + + * `:invalid_options` — required `:format` is absent + * `:unsupported_codec` — the format is not stream-decodable + * `:io_error` — a file source cannot be read + * `:invalid_data` — the encoded payload is malformed or truncated + + ## Raises + + Missing or invalid format values and file read errors are yielded as error + tuples. Passing non-keyword `opts` raises `FunctionClauseError`; enumeration + may propagate unexpected exceptions from the source enumerable or runtime. + + ## Examples + + iex> alias ExCodecs.Spatial.{Point, PointCloud} + iex> {:ok, bin} = ExCodecs.Spatial.encode(PointCloud.new([Point.new(1.0, 2.0, 3.0)]), format: :ply) + iex> [%Point{x: x} | _] = ExCodecs.stream_decode(bin, format: :ply) |> Enum.to_list() + iex> x == 1.0 + true + """ + @spec stream_decode(Path.t() | binary(), keyword()) :: Enumerable.t() + def stream_decode(source, opts) when is_list(opts) do + ExCodecs.Spatial.stream_decode(source, opts) + end + + @doc """ + Encodes an enumerable of spatial `%Point{}` / `%Gaussian{}` values. + + Delegates to `ExCodecs.Spatial.stream_encode/2`. Collects the enumerable + (format headers need a count). **Not** for registry compression codecs. + + ## Arguments + + * `enumerable` (`Enumerable.t()`) — points or Gaussians, all of one type + * `opts` (`keyword()`) — requires `:format` (`:ply`, `:spatial_binary`, or + `:gsplat`) and may contain format-specific options + + ## Returns + + * `{:ok, binary()}` — encoded spatial payload + * `{:error, %ExCodecs.Error{reason: :invalid_options}}` — required format + is absent or a format option is invalid + * `{:error, %ExCodecs.Error{reason: :unsupported_codec}}` — format is + unknown + * `{:error, %ExCodecs.Error{reason: :invalid_data}}` — items are mixed, + malformed, unsupported, or include an error tuple + + ## Raises + + Returns error tuples for documented format, option, and item failures. + Passing non-keyword `opts` raises `FunctionClauseError`. A value that does not + implement `Enumerable` raises `Protocol.UndefinedError`, and exceptions raised + while enumerating propagate. + + ## Examples + + iex> alias ExCodecs.Spatial.Point + iex> {:ok, bin} = ExCodecs.stream_encode([Point.new(0.0, 0.0, 0.0)], format: :ply) + iex> is_binary(bin) + true + """ + @spec stream_encode(Enumerable.t(), keyword()) :: {:ok, binary()} | {:error, Error.t()} + def stream_encode(enumerable, opts) when is_list(opts) do + ExCodecs.Spatial.stream_encode(enumerable, opts) + end + + @doc """ + Lists **registered** codec atoms that are available at runtime. + + Spatial formats are **not** included — use `ExCodecs.Spatial.available_formats/0`. + + ## Arguments + + None. + + ## Returns + + A sorted `[atom()]` containing registered entries whose implementation module + is non-`nil`, for example `[:blosc2, :bzip2, :lz4, :snappy, :zstd]`. + + ## Raises + + May raise `ArgumentError` if the registry ETS table has not been started. ## Examples @@ -146,10 +370,24 @@ defmodule ExCodecs do end @doc """ - Checks if a codec is supported and available at runtime. + Returns whether a **registered** codec is available. + + Spatial format atoms (`:ply`, …) always return `false` here — use + `ExCodecs.Spatial.supports?/1`. + + ## Arguments - Returns `true` only if the codec is both registered and its - native implementation is loaded. + * `codec` (`atom()`) — registry key to test + + ## Returns + + `true` if `codec` is registered with a non-`nil` implementation module; + otherwise `false`. + + ## Raises + + Raises `FunctionClauseError` if `codec` is not an atom. May raise + `ArgumentError` if the registry ETS table has not been started. ## Examples @@ -165,12 +403,22 @@ defmodule ExCodecs do end @doc """ - Returns detailed information about a codec. + Returns metadata for a registered codec. + + ## Arguments + + * `codec` (`atom()`) — registry key whose metadata is requested ## Returns - * `{:ok, %ExCodecs.Codec{}}` - Codec information - * `{:error, :unsupported_codec}` - Codec not found + * `{:ok, ExCodecs.Codec.t()}` — name, category, module, capability flags, + and backend version; unavailable codecs are returned with `module: nil` + * `{:error, :unsupported_codec}` — not registered (note: bare atom, not `%Error{}`) + + ## Raises + + Raises `FunctionClauseError` if `codec` is not an atom. May raise + `ArgumentError` if the registry ETS table has not been started. ## Examples diff --git a/lib/ex_codecs/application.ex b/lib/ex_codecs/application.ex index 9db5bce..62388c2 100644 --- a/lib/ex_codecs/application.ex +++ b/lib/ex_codecs/application.ex @@ -9,16 +9,73 @@ defmodule ExCodecs.Application do use Application @impl true + @doc """ + Starts the ExCodecs supervision tree. + + This callback starts `ExCodecs.CodecRegistry`, registers every built-in + compression codec, and supervises the registry with a `:one_for_one` + strategy. It is invoked by OTP when the `:ex_codecs` application starts; + application code should normally use `Application.ensure_all_started/1` + instead of calling this function directly. + + ## Arguments + + * `type` — `Application.start_type()`. OTP supplies `:normal`, + `{:takeover, node}`, or `{:failover, node}`; ExCodecs does not vary its + startup behavior by type. + * `args` — startup term configured for the application. ExCodecs ignores + this value. + + ## Returns + + * `{:ok, supervisor_pid}` when the supervisor and registry start. + * `{:error, reason}` when `Supervisor.start_link/2` cannot start the + supervision tree. + * `{:ok, supervisor_pid, state}` is permitted by the + `Application.start/2` callback contract, but ExCodecs does not currently + return that form. + + ## Raises + + This callback does not deliberately raise. OTP or supervisor internals may + exit the calling process for unrecoverable startup failures. + + ## Example + + iex> {:ok, _apps} = Application.ensure_all_started(:ex_codecs) + iex> Process.whereis(ExCodecs.Supervisor) |> is_pid() + true + iex> ExCodecs.supports?(:zstd) + true + + ## Callback implementation + + An OTP application that embeds a similar registry can use the same shape: + + defmodule MyApp.Application do + use Application + + @impl Application + def start(_type, _args) do + children = [{ExCodecs.CodecRegistry, register: fn -> :ok end}] + Supervisor.start_link(children, + strategy: :one_for_one, + name: MyApp.Supervisor + ) + end + end + """ + @spec start(Application.start_type(), term()) :: + {:ok, pid()} | {:error, term()} | {:ok, pid(), term()} def start(_type, _args) do children = [ - ExCodecs.CodecRegistry + {ExCodecs.CodecRegistry, register: ®ister_all_codecs/0} ] opts = [strategy: :one_for_one, name: ExCodecs.Supervisor] case Supervisor.start_link(children, opts) do {:ok, pid} -> - register_all_codecs() {:ok, pid} error -> @@ -26,7 +83,8 @@ defmodule ExCodecs.Application do end end - defp register_all_codecs do + @doc false + def register_all_codecs do codecs = [ {:zstd, ExCodecs.Compression.Zstd, :compression}, {:lz4, ExCodecs.Compression.Lz4, :compression}, @@ -35,12 +93,24 @@ defmodule ExCodecs.Application do {:blosc2, ExCodecs.Compression.Blosc2, :compression} ] + nif_ok? = ExCodecs.Native.nif_loaded?() + for {name, module, category} <- codecs do - if Code.ensure_loaded?(module) and function_exported?(module, :encode, 2) do + native? = + function_exported?(module, :__codec_info__, 0) and + match?(%{native?: true}, module.__codec_info__()) + + loadable? = + Code.ensure_loaded?(module) and function_exported?(module, :encode, 2) and + function_exported?(module, :decode, 2) + + if loadable? and (not native? or nif_ok?) do ExCodecs.CodecRegistry.register(name, module, category) else ExCodecs.CodecRegistry.register_unavailable(name, category) end end + + :ok end end diff --git a/lib/ex_codecs/codec.ex b/lib/ex_codecs/codec.ex index 895e018..9b64ad4 100644 --- a/lib/ex_codecs/codec.ex +++ b/lib/ex_codecs/codec.ex @@ -1,80 +1,217 @@ defmodule ExCodecs.Codec do @moduledoc """ - Behaviour definition for ExCodecs codecs. - - Every codec implementation must conform to this behaviour, providing - `encode/2` and `decode/2` callbacks that operate on binaries with - optional keyword-list configuration. - - ## Implementing a Codec - - defmodule ExCodecs.Compression.Zstd do - @behaviour ExCodecs.Codec - - @impl true - def encode(data, opts) do - level = Keyword.get(opts, :level, 3) - with :ok <- validate_level(level) do - ExCodecs.NIF.wrap(:zstd, ExCodecs.Native.zstd_compress(data, level)) - end - end - - @impl true - def decode(data, _opts) do - ExCodecs.NIF.wrap(:zstd, ExCodecs.Native.zstd_decompress(data)) - end - end - - ## Codec Metadata - - Codec modules should also export a `__codec_info__/0` function - that returns metadata about the codec for the registry: - - def __codec_info__ do - %ExCodecs.Codec{ - name: :zstd, - category: :compression, - native?: true, - streaming?: true, - configurable?: true, - version: "1.5.x" - } - end + Behaviour and metadata struct for **registry** binary codecs. + + Every module registered with `ExCodecs.CodecRegistry` should implement + `encode/2` and `decode/2` on **binaries**. Spatial format codecs do **not** + use this behaviour (they live under `ExCodecs.Spatial`). + + The `%ExCodecs.Codec{}` struct describes a registry entry. Its fields are: + + * `name` (`atom()`) — registry key, such as `:zstd` + * `category` (`atom()`) — codec category, currently `:compression` + * `module` (`module() | nil`) — implementation module, or `nil` when the + codec is known but unavailable + * `native?` (`boolean()`) — whether the implementation uses a NIF + * `streaming?` (`boolean()`) — whether an incremental API is available + * `configurable?` (`boolean()`) — whether the codec accepts meaningful options + * `version` (`String.t() | nil`) — backend version, if reported + + For example: + + iex> {:ok, %ExCodecs.Codec{} = codec} = ExCodecs.codec_info(:zstd) + iex> {codec.name, codec.category, codec.module} + {:zstd, :compression, ExCodecs.Compression.Zstd} + + ## Implementing a codec + + defmodule ExCodecs.Compression.Zstd do + @behaviour ExCodecs.Codec + + @impl true + def encode(data, opts) when is_binary(data) and is_list(opts) do + # ... + end + + @impl true + def decode(data, opts) when is_binary(data) and is_list(opts) do + # ... + end + + def __codec_info__ do + %ExCodecs.Codec{ + name: :zstd, + category: :compression, + module: __MODULE__, + native?: true, + streaming?: false, + configurable?: true, + version: "ruzstd-0.8" + } + end + end """ + @typedoc """ + Result returned by `c:encode/2`. + + `{:ok, encoded}` contains the encoded binary. `{:error, error}` contains an + `ExCodecs.Error` whose reason is normally `:invalid_data`, `:invalid_options`, + `:compression_failed`, or `:nif_not_loaded`. + + ## Example + + iex> {:ok, result} = ExCodecs.Compression.Zstd.encode("codec input", []) + iex> is_binary(result) + true + """ @type encode_result :: {:ok, binary()} | {:error, ExCodecs.Error.t()} + + @typedoc """ + Result returned by `c:decode/2`. + + `{:ok, decoded}` contains the decoded binary. `{:error, error}` contains an + `ExCodecs.Error` whose reason is normally `:invalid_data`, + `:invalid_options`, `:decompression_failed`, `:truncated_input`, or + `:nif_not_loaded`. + + ## Example + + iex> {:ok, encoded} = ExCodecs.Compression.Zstd.encode("codec input", []) + iex> ExCodecs.Compression.Zstd.decode(encoded, []) + {:ok, "codec input"} + """ @type decode_result :: {:ok, binary()} | {:error, ExCodecs.Error.t()} @doc """ - Encodes (compresses, hashes, etc.) the given binary data. + Encodes binary data (compress, hash, etc.). ## Arguments - * `data` - The binary data to encode - * `opts` - Codec-specific options as a keyword list + * `data` (`binary()`) — bytes to encode + * `opts` (`keyword()`) — codec-specific options; implementations should + validate every supported key and value ## Returns - * `{:ok, encoded_binary}` - Successfully encoded data - * `{:error, %ExCodecs.Error{}}` - Encoding failed + * `{:ok, binary()}` — encoded bytes + * `{:error, %ExCodecs.Error{reason: :invalid_data}}` — invalid input + * `{:error, %ExCodecs.Error{reason: :invalid_options}}` — unsupported or + invalid options + * `{:error, %ExCodecs.Error{reason: :compression_failed}}` — backend + encoding failure + * `{:error, %ExCodecs.Error{reason: :nif_not_loaded}}` — native library + unavailable + + ## Raises + + Implementations must return an error tuple for invalid data, invalid options, + and expected backend failures. They may raise only for programmer errors or + unexpected runtime faults not represented by `ExCodecs.Error`. + + ## Implementation example + + defmodule Example.ReverseCodec do + @behaviour ExCodecs.Codec + + @impl true + def encode(data, opts) when is_binary(data) and opts == [] do + {:ok, String.reverse(data)} + end + + def encode(data, _opts) when not is_binary(data) do + ExCodecs.Error.error(:invalid_data, codec: :reverse) + end + + def encode(_data, _opts) do + ExCodecs.Error.error(:invalid_options, codec: :reverse) + end + + @impl true + def decode(data, opts), do: encode(data, opts) + end """ @callback encode(data :: binary(), opts :: keyword()) :: encode_result() @doc """ - Decodes (decompresses, etc.) the given binary data. + Decodes binary data (decompress, etc.). ## Arguments - * `data` - The binary data to decode - * `opts` - Codec-specific options as a keyword list + * `data` (`binary()`) — encoded bytes to decode + * `opts` (`keyword()`) — codec-specific decoding options ## Returns - * `{:ok, decoded_binary}` - Successfully decoded data - * `{:error, %ExCodecs.Error{}}` - Decoding failed + * `{:ok, binary()}` — decoded bytes + * `{:error, %ExCodecs.Error{reason: :invalid_data}}` — input has the wrong + type or shape + * `{:error, %ExCodecs.Error{reason: :invalid_options}}` — unsupported or + invalid options + * `{:error, %ExCodecs.Error{reason: :decompression_failed}}` — malformed + payload or backend decoding failure + * `{:error, %ExCodecs.Error{reason: :truncated_input}}` — incomplete input, + when the implementation distinguishes it + * `{:error, %ExCodecs.Error{reason: :nif_not_loaded}}` — native library + unavailable + + ## Raises + + Implementations must return an error tuple for malformed data, invalid + options, and expected backend failures. They may raise only for programmer + errors or unexpected runtime faults not represented by `ExCodecs.Error`. + + ## Implementation example + + defmodule Example.PrefixCodec do + @behaviour ExCodecs.Codec + + @impl true + def encode(data, []) when is_binary(data), do: {:ok, <<"EX", data::binary>>} + + def encode(data, _opts) when not is_binary(data) do + ExCodecs.Error.error(:invalid_data, codec: :prefix) + end + + def encode(_data, _opts) do + ExCodecs.Error.error(:invalid_options, codec: :prefix) + end + + @impl true + def decode(<<"EX", data::binary>>, []), do: {:ok, data} + + def decode(data, _opts) when not is_binary(data) do + ExCodecs.Error.error(:invalid_data, codec: :prefix) + end + + def decode(_data, []), do: ExCodecs.Error.error(:decompression_failed, codec: :prefix) + def decode(_data, _opts), do: ExCodecs.Error.error(:invalid_options, codec: :prefix) + end """ @callback decode(data :: binary(), opts :: keyword()) :: decode_result() + @typedoc """ + Metadata for one binary codec registry entry. + + Every field is public: + + * `name` — registry atom passed to `ExCodecs.encode/3` and + `ExCodecs.decode/3` + * `category` — grouping atom used by + `ExCodecs.CodecRegistry.codecs_by_category/1` + * `module` — callback implementation, or `nil` for an unavailable codec + * `native?` — indicates NIF-backed operation + * `streaming?` — indicates incremental processing support + * `configurable?` — indicates codec-specific option support + * `version` — backend version string, or `nil` if unknown + + ## Example + + iex> {:ok, codec} = ExCodecs.codec_info(:zstd) + iex> %ExCodecs.Codec{name: :zstd, configurable?: configurable?} = codec + iex> is_boolean(configurable?) + true + """ @type t :: %__MODULE__{ name: atom(), category: atom(), @@ -88,7 +225,29 @@ defmodule ExCodecs.Codec do defstruct [:name, :category, :module, :native?, :streaming?, :configurable?, :version] @doc """ - Validates that a module implements the ExCodecs.Codec behaviour. + Returns whether `module` exports `encode/2` and `decode/2`. + + ## Arguments + + * `module` (`module()`) — module to load and inspect + + ## Returns + + * `true` — `module` loads and exports both `encode/2` and `decode/2` + * `false` — it cannot be loaded or either callback is missing + + ## Raises + + Does not raise for a valid `module()` atom. Passing a value outside the + declared type may raise `FunctionClauseError` from the code-loading API. + + ## Examples + + iex> ExCodecs.Codec.validates?(ExCodecs.Compression.Zstd) + true + + iex> ExCodecs.Codec.validates?(Nonexistent.Module) + false """ @spec validates?(module()) :: boolean() def validates?(module) do diff --git a/lib/ex_codecs/codec_registry.ex b/lib/ex_codecs/codec_registry.ex index ec38313..6145a4b 100644 --- a/lib/ex_codecs/codec_registry.ex +++ b/lib/ex_codecs/codec_registry.ex @@ -1,25 +1,17 @@ defmodule ExCodecs.CodecRegistry do @moduledoc """ - Runtime codec registry for ExCodecs. + Runtime registry of **binary** codecs (ETS-backed). - The registry maintains a mapping of codec names to their implementations - and metadata. Codecs are registered at application startup and can be - queried at runtime. + Populated at application start (and again if this process restarts). Spatial + formats are **not** registered here — use `ExCodecs.Spatial`. - ## Registry Operations + ## Typical use iex> ExCodecs.available_codecs() [:blosc2, :bzip2, :lz4, :snappy, :zstd] iex> ExCodecs.supports?(:zstd) true - - iex> {:ok, info} = ExCodecs.codec_info(:zstd) - iex> info.name - :zstd - - The registry is backed by an ETS table for fast lookups and is - populated when the application starts. """ use Agent @@ -28,28 +20,86 @@ defmodule ExCodecs.CodecRegistry do @registry_name __MODULE__ @doc """ - Starts the registry agent. + Starts the registry Agent and optional re-registration callback. + + ## Arguments + + * `opts` (`keyword()`) — accepts `:register`, a zero-arity function invoked + after the named ETS table is created or cleared; it defaults to + `fn -> :ok end` + + ## Returns + + * `{:ok, pid()}` — the named registry Agent started and initialization ran + * `{:error, {:already_started, pid()}}` — the registry is already running + * `{:error, reason}` — Agent startup or the registration callback failed + + ## Raises + + With a valid keyword list, startup failures are returned by `Agent`. Passing + a non-keyword value can raise `FunctionClauseError` while reading options. + + ## Example + + A supervision tree normally starts the registry and supplies the callback: + + children = [ + {ExCodecs.CodecRegistry, register: &MyApp.Codecs.register_all/0} + ] + + Supervisor.start_link(children, strategy: :one_for_one) """ @spec start_link(keyword()) :: Agent.on_start() - def start_link(_opts \\ []) do - Agent.start_link(fn -> :ets.new(@table_name, [:set, :public, :named_table]) end, + def start_link(opts \\ []) do + register_fun = Keyword.get(opts, :register, fn -> :ok end) + + Agent.start_link( + fn -> + case :ets.whereis(@table_name) do + :undefined -> + :ets.new(@table_name, [:set, :public, :named_table]) + + _tid -> + :ets.delete_all_objects(@table_name) + end + + register_fun.() + @table_name + end, name: @registry_name ) end @doc """ - Registers a codec with the registry. + Registers a module that validates as `ExCodecs.Codec`. ## Arguments - * `name` - The atom name of the codec (e.g., `:zstd`) - * `module` - The module implementing `ExCodecs.Codec` - * `category` - The codec category (e.g., `:compression`) + * `name` (`atom()`) — registry key used for lookups + * `module` (`module()`) — loaded module exporting `encode/2` and `decode/2` + * `category` (`atom()`) — grouping key, such as `:compression` ## Returns - * `:ok` - Codec registered successfully - * `{:error, reason}` - Registration failed + * `:ok` — metadata was stored, replacing any entry with the same `name` + * `{:error, {:invalid_codec_module, module}}` — the module cannot be loaded + or does not export both codec callbacks + + ## Raises + + May raise `ArgumentError` if the registry ETS table does not exist. A codec's + optional public `__codec_info__/0` function is called during registration and + any exception it raises propagates. + + ## Examples + + iex> :ok = ExCodecs.CodecRegistry.register( + ...> :zstd, + ...> ExCodecs.Compression.Zstd, + ...> :compression + ...> ) + iex> ExCodecs.CodecRegistry.supports?(:zstd) + true """ @spec register(atom(), module(), atom()) :: :ok | {:error, term()} def register(name, module, category) do @@ -66,7 +116,29 @@ defmodule ExCodecs.CodecRegistry do end @doc """ - Registers a codec as unavailable (known but not loadable). + Registers a known codec with `module: nil` (unavailable). + + ## Arguments + + * `name` (`atom()`) — known codec's registry key + * `category` (`atom()`) — grouping key, such as `:compression` + + ## Returns + + Always `:ok` after storing a `%ExCodecs.Codec{module: nil}` entry. + + ## Raises + + May raise `ArgumentError` if the registry ETS table does not exist. + + ## Example + + iex> :ok = ExCodecs.CodecRegistry.register_unavailable(:example_optional, :compression) + iex> {:ok, info} = ExCodecs.CodecRegistry.codec_info(:example_optional) + iex> {info.module, ExCodecs.CodecRegistry.supports?(:example_optional)} + {nil, false} + iex> ExCodecs.CodecRegistry.unregister(:example_optional) + :ok """ @spec register_unavailable(atom(), atom()) :: :ok def register_unavailable(name, category) do @@ -85,15 +157,60 @@ defmodule ExCodecs.CodecRegistry do end @doc """ - Looks up a codec by name. + Deletes a registry entry (tests / hot reload). + + ## Arguments + + * `name` (`atom()`) — registry key to remove ## Returns - * `{:ok, {module, category, info}}` - Codec found - * `{:error, :unsupported_codec}` - Codec not found + Always `:ok`, whether or not an entry existed. + + ## Raises + + Raises `FunctionClauseError` when `name` is not an atom. May raise + `ArgumentError` if the registry ETS table does not exist. + + ## Example + + iex> :ok = ExCodecs.CodecRegistry.register_unavailable(:temporary_codec, :compression) + iex> :ok = ExCodecs.CodecRegistry.unregister(:temporary_codec) + iex> ExCodecs.CodecRegistry.lookup(:temporary_codec) + {:error, :unsupported_codec} + """ + @spec unregister(atom()) :: :ok + def unregister(name) when is_atom(name) do + :ets.delete(@table_name, name) + :ok + end + + @doc """ + Looks up `{module, category, info}` for `name`. + + ## Arguments + + * `name` (`atom()`) — codec registry key + + ## Returns + + * `{:ok, {module() | nil, atom(), ExCodecs.Codec.t()}}` — implementation, + category, and metadata for a registered name + * `{:error, :unsupported_codec}` — no entry exists for `name` + + ## Raises + + Raises `FunctionClauseError` when `name` is not an atom. May raise + `ArgumentError` if the registry ETS table does not exist. + + ## Example + + iex> {:ok, {module, :compression, info}} = ExCodecs.CodecRegistry.lookup(:zstd) + iex> {module, info.name} + {ExCodecs.Compression.Zstd, :zstd} """ @spec lookup(atom()) :: - {:ok, {module(), atom(), ExCodecs.Codec.t()}} | {:error, :unsupported_codec} + {:ok, {module() | nil, atom(), ExCodecs.Codec.t()}} | {:error, :unsupported_codec} def lookup(name) when is_atom(name) do case :ets.lookup(@table_name, name) do [{^name, {module, category, info}}] -> @@ -105,7 +222,26 @@ defmodule ExCodecs.CodecRegistry do end @doc """ - Returns a list of all available codec names. + Sorted list of codec atoms with a non-nil module. + + ## Arguments + + None. + + ## Returns + + A sorted `[atom()]`. Unavailable entries registered with + `register_unavailable/2` are omitted. + + ## Raises + + May raise `ArgumentError` if the registry ETS table does not exist. + + ## Example + + iex> codecs = ExCodecs.CodecRegistry.available_codecs() + iex> codecs == Enum.sort(codecs) and :zstd in codecs + true """ @spec available_codecs() :: [atom()] def available_codecs do @@ -116,7 +252,27 @@ defmodule ExCodecs.CodecRegistry do end @doc """ - Returns all registered codec names (including unavailable ones). + Sorted list of all registered names (including unavailable). + + ## Arguments + + None. + + ## Returns + + A sorted `[atom()]`, including entries whose module is `nil`. + + ## Raises + + May raise `ArgumentError` if the registry ETS table does not exist. + + ## Example + + iex> :ok = ExCodecs.CodecRegistry.register_unavailable(:documented_optional, :compression) + iex> :documented_optional in ExCodecs.CodecRegistry.all_codecs() + true + iex> ExCodecs.CodecRegistry.unregister(:documented_optional) + :ok """ @spec all_codecs() :: [atom()] def all_codecs do @@ -126,7 +282,28 @@ defmodule ExCodecs.CodecRegistry do end @doc """ - Checks if a codec is supported and available. + Returns `true` if registered and `module != nil`. + + ## Arguments + + * `name` (`atom()`) — registry key to test + + ## Returns + + `true` only when `name` is registered with a non-`nil` module; otherwise + `false`. + + ## Raises + + Raises `FunctionClauseError` when `name` is not an atom. May raise + `ArgumentError` if the registry ETS table does not exist. + + ## Example + + iex> ExCodecs.CodecRegistry.supports?(:zstd) + true + iex> ExCodecs.CodecRegistry.supports?(:unknown_codec) + false """ @spec supports?(atom()) :: boolean() def supports?(name) when is_atom(name) do @@ -137,7 +314,29 @@ defmodule ExCodecs.CodecRegistry do end @doc """ - Returns detailed information about a codec. + Returns `%ExCodecs.Codec{}` for `name`. + + ## Arguments + + * `name` (`atom()`) — codec registry key + + ## Returns + + * `{:ok, ExCodecs.Codec.t()}` — metadata for a registered codec, including + unavailable codecs + * `{:error, :unsupported_codec}` — no registry entry exists + + ## Raises + + Raises `FunctionClauseError` when `name` is not an atom. May raise + `ArgumentError` if the registry ETS table does not exist. + + ## Example + + iex> {:ok, %ExCodecs.Codec{name: :zstd, category: :compression}} = + ...> ExCodecs.CodecRegistry.codec_info(:zstd) + iex> true + true """ @spec codec_info(atom()) :: {:ok, ExCodecs.Codec.t()} | {:error, :unsupported_codec} def codec_info(name) when is_atom(name) do @@ -148,7 +347,29 @@ defmodule ExCodecs.CodecRegistry do end @doc """ - Returns all codecs in a given category. + Lists `%ExCodecs.Codec{}` for a category atom (e.g. `:compression`). + + ## Arguments + + * `category` (`atom()`) — category to select, such as `:compression` + + ## Returns + + A `[ExCodecs.Codec.t()]` sorted by each struct's `name`. The list includes + unavailable entries in that category and is empty when none match. + + ## Raises + + Raises `FunctionClauseError` when `category` is not an atom. May raise + `ArgumentError` if the registry ETS table does not exist. + + ## Example + + iex> codecs = ExCodecs.CodecRegistry.codecs_by_category(:compression) + iex> Enum.all?(codecs, &match?(%ExCodecs.Codec{category: :compression}, &1)) + true + iex> Enum.map(codecs, & &1.name) == Enum.sort(Enum.map(codecs, & &1.name)) + true """ @spec codecs_by_category(atom()) :: [ExCodecs.Codec.t()] def codecs_by_category(category) when is_atom(category) do diff --git a/lib/ex_codecs/compression.ex b/lib/ex_codecs/compression.ex index b4b405f..b941b83 100644 --- a/lib/ex_codecs/compression.ex +++ b/lib/ex_codecs/compression.ex @@ -1,39 +1,52 @@ defmodule ExCodecs.Compression do @moduledoc """ - Compression codec category for ExCodecs. + Compression **category module**. - This module serves as a namespace for compression codecs and provides - category-level utilities for comparing and selecting compression algorithms. + Thin category helper: domain names (`compress` / `decompress`) and listing. + The real API is still `ExCodecs.encode/3` / `decode/3` (codec atom + binary). - ## Available Codecs + ## Available codec modules - * `ExCodecs.Compression.Zstd` — High ratio, good speed - * `ExCodecs.Compression.Lz4` — Extremely fast compression - * `ExCodecs.Compression.Snappy` — Fast with low overhead - * `ExCodecs.Compression.Bzip2` — High compression ratio - * `ExCodecs.Compression.Blosc2` — Meta-compressor for array data + * `ExCodecs.Compression.Zstd` + * `ExCodecs.Compression.Lz4` + * `ExCodecs.Compression.Snappy` — standalone Snappy (not Blosc2 `cname: :snappy`) + * `ExCodecs.Compression.Bzip2` + * `ExCodecs.Compression.Blosc2` — C-Blosc2 **chunk** only - ## Compression vs Encoding - - In ExCodecs, compression is encoding — and decompression is decoding. - This consistent terminology spans all codec categories: + ## Examples - # These are equivalent - ExCodecs.encode(:zstd, data) # compress - ExCodecs.decode(:zstd, data) # decompress + {:ok, c} = ExCodecs.Compression.compress(:zstd, data, level: 3) + {:ok, d} = ExCodecs.Compression.decompress(:zstd, c) + # same as: + {:ok, c} = ExCodecs.encode(:zstd, data, level: 3) """ alias ExCodecs.CodecRegistry @doc """ - Returns all available compression codecs. + Lists metadata for every registered compression codec. + + ## Arguments + + This function takes no arguments. + + ## Returns + + A list of `ExCodecs.Codec.t()` values sorted by codec name. Each struct + describes the registry name, implementation module, native/configuration + flags, streaming support, and backend version. A known codec that is not + available at runtime may have `module: nil`. + + ## Raises / Exceptions - Returns a list of `%ExCodecs.Codec{}` structs sorted by name. + This function does not raise. ## Examples iex> codecs = ExCodecs.Compression.available_codecs() - iex> is_list(codecs) and length(codecs) >= 5 + iex> Enum.map(codecs, & &1.name) + [:blosc2, :bzip2, :lz4, :snappy, :zstd] + iex> Enum.all?(codecs, &(&1.category == :compression)) true """ @spec available_codecs() :: [ExCodecs.Codec.t()] @@ -42,9 +55,43 @@ defmodule ExCodecs.Compression do end @doc """ - Compresses data with the specified codec. + Compresses `data` with a registered compression codec. + + This is the compression-category alias for `ExCodecs.encode/3`. + + ## Arguments + + * `codec` (`atom()`) — registered compression codec, such as `:zstd`, + `:lz4`, `:snappy`, `:bzip2`, or `:blosc2` + * `data` (`binary()`) — bytes to compress + * `opts` (`keyword()`) — codec-specific options; defaults to `[]` + + ## Returns + + * `{:ok, compressed :: binary()}` on success + * `{:error, %ExCodecs.Error{reason: reason}}` on failure, where `reason` + can be: + * `:unsupported_codec` when `codec` is not registered + * `:codec_unavailable` when its implementation is unavailable + * `:invalid_data` when the arguments have the wrong shape + * `:invalid_options` when codec option validation fails + * `:compression_failed` when the native compressor rejects the operation + * `:nif_not_loaded` when the native library is unavailable + + ## Raises / Exceptions + + Normal validation and wrapped NIF failures are returned as error tuples. + Unexpected VM-level faults outside the NIF wrapper may still raise. - Shortcut for `ExCodecs.encode/3`. + ## Examples + + iex> payload = "sensor=18.4" + iex> {:ok, compressed} = ExCodecs.Compression.compress(:zstd, payload, level: 3) + iex> {:ok, ^payload} = ExCodecs.Compression.decompress(:zstd, compressed) + + iex> {:error, error} = ExCodecs.Compression.compress(:zstd, "data", level: 23) + iex> error.reason + :invalid_options """ @spec compress(atom(), binary(), keyword()) :: {:ok, binary()} | {:error, ExCodecs.Error.t()} def compress(codec, data, opts \\ []) do @@ -52,9 +99,43 @@ defmodule ExCodecs.Compression do end @doc """ - Decompresses data with the specified codec. + Decompresses `data` with a registered compression codec. + + This is the compression-category alias for `ExCodecs.decode/3`. + + ## Arguments + + * `codec` (`atom()`) — registered codec that produced the payload + * `data` (`binary()`) — compressed bytes in that codec's wire format + * `opts` (`keyword()`) — codec-specific decode options; defaults to `[]` + and is currently ignored by the built-in compression codecs + + ## Returns + + * `{:ok, decompressed :: binary()}` on success + * `{:error, %ExCodecs.Error{reason: reason}}` on failure, where `reason` + can be: + * `:unsupported_codec` when `codec` is not registered + * `:codec_unavailable` when its implementation is unavailable + * `:invalid_data` for invalid argument types or an unexpected NIF result + * `:decompression_failed` for corrupt, truncated, or mismatched input + * `:nif_not_loaded` when the native library is unavailable + + ## Raises / Exceptions + + Normal validation and wrapped NIF failures are returned as error tuples. + Unexpected VM-level faults outside the NIF wrapper may still raise. + + ## Examples + + iex> payload = <<0, 1, 2, 3, 4>> + iex> {:ok, compressed} = ExCodecs.Compression.compress(:snappy, payload) + iex> ExCodecs.Compression.decompress(:snappy, compressed) + {:ok, <<0, 1, 2, 3, 4>>} - Shortcut for `ExCodecs.decode/3`. + iex> {:error, error} = ExCodecs.Compression.decompress(:snappy, "not snappy") + iex> error.reason + :decompression_failed """ @spec decompress(atom(), binary(), keyword()) :: {:ok, binary()} | {:error, ExCodecs.Error.t()} def decompress(codec, data, opts \\ []) do diff --git a/lib/ex_codecs/compression/blosc2.ex b/lib/ex_codecs/compression/blosc2.ex index 73ef086..9f129b5 100644 --- a/lib/ex_codecs/compression/blosc2.ex +++ b/lib/ex_codecs/compression/blosc2.ex @@ -1,29 +1,43 @@ defmodule ExCodecs.Compression.Blosc2 do @moduledoc """ - Blosc2 meta-compressor codec. + Blosc2 **chunk** codec — C-Blosc2-compatible wire format, pure Rust. - Blosc2 is a high-performance meta-compressor designed for binary data, - particularly numerical arrays. It can use other compressors (Zstd, LZ4, etc.) - internally while adding features like byte shuffle and frame-based - container formats. + ## What you get (chunk only) + + ``` + binary → [filters] → [codec] → one Blosc2 chunk binary + ``` + + This matches python-blosc2 / C-Blosc2 **single-buffer** compress/decompress. + + ### Not included + + | Layer | Status | + |-------|--------| + | Super-chunk (SChunk) | No | + | Contiguous frame (`.b2frame`) | No | + | B2ND (N-D arrays) | No | + + For large data, split buffers yourself and store multiple chunks. Usability + for “compress my array slice in Elixir” is full; for “Blosc2 as a database + file format”, use python/C Blosc2. ## Options - * `:cname` — Internal compressor: `:lz4`, `:lz4hc`, `:blosclz`, - `:zstd`, `:snappy`, `:zlib` (default: `:lz4`) - * `:clevel` — Compression level 0-9 (default: 5). 0 means no compression - (store raw data). - * `:shuffle` — Shuffle filter: `:none`, `:byte`, `:bit` (default: `:byte`). - Byte shuffle reorders data to improve compression ratios for typed data. - Bit shuffle transposes at the bit level for even better compression on numerical data. - * `:typesize` — Element size in bytes for shuffle (default: 8) + * `:cname` — `:blosclz` | `:lz4` (default) | `:lz4hc` | `:zstd` | `:zlib` + * `:clevel` — `0..9` (default `5`) + * `:shuffle` — `:none` | `:byte` (default) | `:bit` + * `:typesize` — `1..255` (default `8`) + + ### Snappy - ## Performance Characteristics + `cname: :snappy` is **rejected**. Use standalone `ExCodecs.encode(:snappy, data)` + or Blosc2 with `:lz4` / `:blosclz`. - * Optimized for numerical/array data - * Byte shuffle dramatically improves compression ratios for typed data - * Bit shuffle can further improve compression on numerical data with small deltas - * Excellent when used with appropriate typesize and shuffle settings + ## Implementation + + Pure-Rust `blosc2-pure-rs` (no C-Blosc2 / cmake). NIF uses single-threaded + compression (`nthreads: 1`) on DirtyCpu. ## Examples @@ -31,14 +45,6 @@ defmodule ExCodecs.Compression.Blosc2 do iex> {:ok, decompressed} = ExCodecs.decode(:blosc2, compressed) iex> decompressed <<1, 2, 3, 4, 5, 6, 7, 8>> - - iex> {:ok, compressed} = ExCodecs.encode(:blosc2, <<1, 2, 3, 4, 5, 6, 7, 8>>, cname: :zstd, clevel: 5, shuffle: :byte) - iex> is_binary(compressed) - true - - > **Note**: Blosc2 is optimized for data whose length is a multiple of - > `typesize`. For general-purpose binary compression, Zstd or LZ4 may be - > more appropriate. """ @behaviour ExCodecs.Codec @@ -48,11 +54,45 @@ defmodule ExCodecs.Compression.Blosc2 do @default_shuffle :byte @default_typesize 8 - @valid_cnames [:lz4, :lz4hc, :blosclz, :zstd, :snappy, :zlib] + @valid_cnames [:blosclz, :lz4, :lz4hc, :zstd, :zlib] @valid_shuffles [:none, :byte, :bit] @doc """ - Returns codec metadata for the registry. + Returns the registry metadata for the Blosc2 chunk codec. + + ## Arguments + + This function takes no arguments. + + ## Returns + + An `ExCodecs.Codec.t()` with these Blosc2-specific fields: + + * `name: :blosc2` and `category: :compression` + * `module: ExCodecs.Compression.Blosc2` + * `native?: true` because compression runs in a NIF + * `streaming?: false` because only individual chunks are supported + * `configurable?: true` because `encode/2` accepts compressor and filter + options + * `version: "c-blosc2-chunk/pure-rust"` for the compatible format and + backend + + ## Raises / Exceptions + + This function does not invoke the NIF and does not raise. + + ## Examples + + iex> ExCodecs.Compression.Blosc2.__codec_info__() + %ExCodecs.Codec{ + name: :blosc2, + category: :compression, + module: ExCodecs.Compression.Blosc2, + native?: true, + streaming?: false, + configurable?: true, + version: "c-blosc2-chunk/pure-rust" + } """ def __codec_info__ do %ExCodecs.Codec{ @@ -60,23 +100,67 @@ defmodule ExCodecs.Compression.Blosc2 do category: :compression, module: __MODULE__, native?: true, - streaming?: true, + streaming?: false, configurable?: true, version: blosc2_version() } end - defp blosc2_version, do: "2.x-pure-rust" + defp blosc2_version, do: "c-blosc2-chunk/pure-rust" @doc """ - Encodes (compresses) data using Blosc2. + Compresses a binary into a C-Blosc2-compatible **chunk**. - ## Options + ## Arguments + + * `data` (`binary()`) — uncompressed bytes. When shuffling, choose a + `:typesize` matching each logical value; a whole-value multiple is + preferred. + * `opts` (`keyword()`) — compression settings: + * `:cname` — `:blosclz | :lz4 | :lz4hc | :zstd | :zlib`; defaults to + `:lz4` + * `:clevel` — integer compression level in `0..9`; defaults to `5` + * `:shuffle` — `:none | :byte | :bit`; defaults to `:byte` + * `:typesize` — logical element size in bytes, integer `1..255`; + defaults to `8` + + Unknown keys are ignored. `:snappy` is not a valid `:cname`. + + ## Returns - * `:cname` — Internal compressor atom (default: `:lz4`) - * `:clevel` — Compression level 0-9 (default: 5) - * `:shuffle` — Shuffle filter: `:none`, `:byte`, `:bit` (default: `:byte`) - * `:typesize` — Element size in bytes (default: 8) + * `{:ok, chunk :: binary()}` containing one Blosc2 chunk + * `{:error, %ExCodecs.Error{reason: :invalid_data}}` when `data` is not a + binary, `opts` is not a list, or the NIF raises an argument error + * `{:error, %ExCodecs.Error{reason: :invalid_options}}` for an unsupported + `:cname` (including `:snappy`) or an out-of-range option + * `{:error, %ExCodecs.Error{reason: :compression_failed}}` when the native + compressor fails + * `{:error, %ExCodecs.Error{reason: :nif_not_loaded}}` when the native + library is unavailable + + ## Raises / Exceptions + + Guard/option validation failures and `ErlangError`/`ArgumentError` + exceptions from the NIF call are converted to error tuples. Unexpected + exception classes may propagate. + + ## Examples + + iex> samples = <<100::little-16, 101::little-16, 102::little-16>> + iex> {:ok, chunk} = + ...> ExCodecs.Compression.Blosc2.encode(samples, + ...> cname: :zstd, + ...> clevel: 7, + ...> shuffle: :byte, + ...> typesize: 2 + ...> ) + iex> ExCodecs.Compression.Blosc2.decode(chunk, []) + {:ok, <<100::little-16, 101::little-16, 102::little-16>>} + + iex> {:error, error} = + ...> ExCodecs.Compression.Blosc2.encode("data", cname: :snappy) + iex> error.reason + :invalid_options """ @impl true def encode(data, opts) when is_binary(data) and is_list(opts) do @@ -89,8 +173,7 @@ defmodule ExCodecs.Compression.Blosc2 do :ok <- validate_clevel(clevel), :ok <- validate_shuffle(shuffle), :ok <- validate_typesize(typesize) do - ExCodecs.NIF.wrap( - :blosc2, + ExCodecs.NIF.safe_call(:blosc2, fn -> ExCodecs.Native.blosc2_compress( data, cname_to_int(cname), @@ -98,20 +181,75 @@ defmodule ExCodecs.Compression.Blosc2 do shuffle_to_int(shuffle), typesize ) - ) + end) end end + def encode(_data, _opts) do + {:error, ExCodecs.Error.new(:invalid_data, codec: :blosc2)} + end + @doc """ - Decodes (decompresses) Blosc2-compressed data. + Decompresses a Blosc2 **chunk** binary. + + ## Arguments + + * `data` (`binary()`) — one chunk produced by this codec or by + C/python-blosc2 single-buffer `compress` + * `opts` (`term()`) — ignored by this direct function; callers using the + codec behaviour or registry API should pass the keyword list `[]` + + ## Returns + + * `{:ok, decompressed :: binary()}` on success + * `{:error, %ExCodecs.Error{reason: :invalid_data}}` when `data` is not a + binary, the chunk header is shorter than 16 bytes, the declared output + exceeds 1 GiB, or the NIF raises an argument error + * `{:error, %ExCodecs.Error{reason: :decompression_failed}}` when the chunk + is corrupt, truncated, unsupported, or is a Blosc2 container rather than + a single chunk + * `{:error, %ExCodecs.Error{reason: :nif_not_loaded}}` when the native + library is unavailable + + ## Raises / Exceptions + + Data guard failures and `ErlangError`/`ArgumentError` exceptions from the NIF + call are converted to error tuples. Because `opts` is ignored, this direct + function also accepts non-list option terms. Unexpected exception classes + may propagate. + + ## Examples + + iex> payload = "one Blosc2 chunk" + iex> {:ok, chunk} = + ...> ExCodecs.Compression.Blosc2.encode(payload, shuffle: :none, typesize: 1) + iex> ExCodecs.Compression.Blosc2.decode(chunk, []) + {:ok, "one Blosc2 chunk"} + + iex> {:error, error} = ExCodecs.Compression.Blosc2.decode("short", []) + iex> error.reason + :invalid_data """ @impl true def decode(data, _opts) when is_binary(data) do - ExCodecs.NIF.wrap(:blosc2, ExCodecs.Native.blosc2_decompress(data)) + ExCodecs.NIF.safe_call(:blosc2, fn -> ExCodecs.Native.blosc2_decompress(data) end) + end + + def decode(_data, _opts) do + {:error, ExCodecs.Error.new(:invalid_data, codec: :blosc2)} end defp validate_cname(cname) when cname in @valid_cnames, do: :ok + defp validate_cname(:snappy) do + {:error, + ExCodecs.Error.new(:invalid_options, + codec: :blosc2, + message: + ":snappy is not a standard C-Blosc2 compressor in this build; use one of: #{inspect(@valid_cnames)}" + )} + end + defp validate_cname(_), do: {:error, @@ -135,19 +273,18 @@ defmodule ExCodecs.Compression.Blosc2 do message: "shuffle must be one of: #{inspect(@valid_shuffles)}" )} - defp validate_typesize(ts) when is_integer(ts) and ts > 0 and ts <= 256, do: :ok + defp validate_typesize(ts) when is_integer(ts) and ts > 0 and ts <= 255, do: :ok defp validate_typesize(_), do: {:error, ExCodecs.Error.new(:invalid_options, - message: "typesize must be a positive integer up to 256" + message: "typesize must be an integer from 1 to 255" )} defp cname_to_int(:blosclz), do: 0 defp cname_to_int(:lz4), do: 1 defp cname_to_int(:lz4hc), do: 2 - defp cname_to_int(:snappy), do: 3 defp cname_to_int(:zlib), do: 4 defp cname_to_int(:zstd), do: 5 diff --git a/lib/ex_codecs/compression/bzip2.ex b/lib/ex_codecs/compression/bzip2.ex index 0648ce0..ffb387f 100644 --- a/lib/ex_codecs/compression/bzip2.ex +++ b/lib/ex_codecs/compression/bzip2.ex @@ -1,22 +1,10 @@ defmodule ExCodecs.Compression.Bzip2 do @moduledoc """ - Bzip2 compression codec. - - Bzip2 is a high-ratio compression algorithm using the Burrows-Wheeler - block-sorting text compression algorithm and Huffman coding. It produces - smaller output than most other algorithms but is significantly slower. + Bzip2 compression codec (pure-Rust backend). ## Options - * `:block_size` — Block size multiplier, 1-9 (default: 9). Higher values - produce smaller output but use more memory. - - ## Performance Characteristics - - * Excellent compression ratio - * Slower compression and decompression than Zstd - * Higher memory usage, especially at higher block sizes - * Best for archival or storage where ratio matters more than speed + * `:block_size` — 1..9 (default 9) ## Examples @@ -35,7 +23,39 @@ defmodule ExCodecs.Compression.Bzip2 do @default_block_size 9 @doc """ - Returns codec metadata for the registry. + Returns the registry metadata for the Bzip2 codec. + + ## Arguments + + This function takes no arguments. + + ## Returns + + An `ExCodecs.Codec.t()` with these Bzip2-specific fields: + + * `name: :bzip2` and `category: :compression` + * `module: ExCodecs.Compression.Bzip2` + * `native?: true` because compression runs in a NIF + * `streaming?: false` because only complete payloads are supported + * `configurable?: true` because `encode/2` accepts `:block_size` + * `version: "bzip2-0.6/libbz2-rs"` for the backend implementation + + ## Raises / Exceptions + + This function does not invoke the NIF and does not raise. + + ## Examples + + iex> ExCodecs.Compression.Bzip2.__codec_info__() + %ExCodecs.Codec{ + name: :bzip2, + category: :compression, + module: ExCodecs.Compression.Bzip2, + native?: true, + streaming?: false, + configurable?: true, + version: "bzip2-0.6/libbz2-rs" + } """ def __codec_info__ do %ExCodecs.Codec{ @@ -49,32 +69,105 @@ defmodule ExCodecs.Compression.Bzip2 do } end - defp bzip2_version, do: "0.4.x" + defp bzip2_version, do: "bzip2-0.6/libbz2-rs" @doc """ - Encodes (compresses) data using Bzip2. + Compresses a binary with Bzip2. - ## Options + ## Arguments + + * `data` (`binary()`) — uncompressed bytes + * `opts` (`keyword()`) — options containing `:block_size`, an integer from + `1` (100 KiB blocks) through `9` (900 KiB blocks); defaults to `9`. + Unknown keys are ignored. + + ## Returns + + * `{:ok, compressed :: binary()}` containing a Bzip2 stream + * `{:error, %ExCodecs.Error{reason: :invalid_data}}` when `data` is not a + binary, `opts` is not a list, or the NIF raises an argument error + * `{:error, %ExCodecs.Error{reason: :invalid_options}}` when `:block_size` + is not an integer in `1..9` + * `{:error, %ExCodecs.Error{reason: :compression_failed}}` when the native + compressor fails + * `{:error, %ExCodecs.Error{reason: :nif_not_loaded}}` when the native + library is unavailable + + ## Raises / Exceptions - * `:block_size` — Block size 1-9 (default: 9) + Guard/option validation failures and `ErlangError`/`ArgumentError` + exceptions from the NIF call are converted to error tuples. Unexpected + exception classes may propagate. + + ## Examples + + iex> payload = :binary.copy("daily-report,", 10) + iex> {:ok, compressed} = + ...> ExCodecs.Compression.Bzip2.encode(payload, block_size: 6) + iex> is_binary(compressed) + true + iex> ExCodecs.Compression.Bzip2.decode(compressed, []) + {:ok, payload} + + iex> {:error, error} = ExCodecs.Compression.Bzip2.encode("data", block_size: 10) + iex> error.reason + :invalid_options """ @impl true def encode(data, opts) when is_binary(data) and is_list(opts) do block_size = Keyword.get(opts, :block_size, @default_block_size) with :ok <- validate_block_size(block_size) do - ExCodecs.NIF.wrap(:bzip2, ExCodecs.Native.bzip2_compress(data, block_size)) + ExCodecs.NIF.safe_call(:bzip2, fn -> ExCodecs.Native.bzip2_compress(data, block_size) end) end end + def encode(_data, _opts), do: {:error, ExCodecs.Error.new(:invalid_data, codec: :bzip2)} + @doc """ - Decodes (decompresses) Bzip2-compressed data. + Decompresses Bzip2 data. + + ## Arguments + + * `data` (`binary()`) — a complete Bzip2 stream + * `opts` (`term()`) — ignored by this direct function; callers using the + codec behaviour or registry API should pass the keyword list `[]` + + ## Returns + + * `{:ok, decompressed :: binary()}` on success + * `{:error, %ExCodecs.Error{reason: :invalid_data}}` when `data` is not a + binary or the NIF raises an argument error + * `{:error, %ExCodecs.Error{reason: :decompression_failed}}` when `data` + is corrupt, truncated, or not a Bzip2 stream + * `{:error, %ExCodecs.Error{reason: :nif_not_loaded}}` when the native + library is unavailable + + ## Raises / Exceptions + + Data guard failures and `ErlangError`/`ArgumentError` exceptions from the NIF + call are converted to error tuples. Because `opts` is ignored, this direct + function also accepts non-list option terms. Unexpected exception classes + may propagate. + + ## Examples + + iex> payload = "quarterly results" + iex> {:ok, compressed} = ExCodecs.Compression.Bzip2.encode(payload, []) + iex> ExCodecs.Compression.Bzip2.decode(compressed, []) + {:ok, "quarterly results"} + + iex> {:error, error} = ExCodecs.Compression.Bzip2.decode("not bzip2", []) + iex> error.reason + :decompression_failed """ @impl true def decode(data, _opts) when is_binary(data) do - ExCodecs.NIF.wrap(:bzip2, ExCodecs.Native.bzip2_decompress(data)) + ExCodecs.NIF.safe_call(:bzip2, fn -> ExCodecs.Native.bzip2_decompress(data) end) end + def decode(_data, _opts), do: {:error, ExCodecs.Error.new(:invalid_data, codec: :bzip2)} + defp validate_block_size(bs) when is_integer(bs) and bs >= 1 and bs <= 9, do: :ok defp validate_block_size(_), diff --git a/lib/ex_codecs/compression/lz4.ex b/lib/ex_codecs/compression/lz4.ex index c0c04ed..c8e8653 100644 --- a/lib/ex_codecs/compression/lz4.ex +++ b/lib/ex_codecs/compression/lz4.ex @@ -1,19 +1,13 @@ defmodule ExCodecs.Compression.Lz4 do @moduledoc """ - LZ4 compression codec. + LZ4 compression codec (size-prepended `lz4_flex` blocks). - LZ4 is an extremely fast compression algorithm focused on speed. - It provides compression at over 1 GB/s per core and decompression - at multi-GB/s speeds. + Not interchangeable with lz4frame / CLI `.lz4` files unless they use the + same size-prefix framing. - LZ4 does not accept configuration options. It uses a fixed compression - strategy optimized for speed. + ## Options - ## Performance Characteristics - - * Extremely fast compression and decompression - * Lower compression ratio compared to Zstd or Bzip2 - * Ideal for real-time and latency-sensitive applications + None. ## Examples @@ -26,7 +20,39 @@ defmodule ExCodecs.Compression.Lz4 do @behaviour ExCodecs.Codec @doc """ - Returns codec metadata for the registry. + Returns the registry metadata for the LZ4 codec. + + ## Arguments + + This function takes no arguments. + + ## Returns + + An `ExCodecs.Codec.t()` with these LZ4-specific fields: + + * `name: :lz4` and `category: :compression` + * `module: ExCodecs.Compression.Lz4` + * `native?: true` because compression runs in a NIF + * `streaming?: false` because only complete blocks are supported + * `configurable?: false` because this codec has no options + * `version: "lz4_flex-0.11"` for the backend implementation + + ## Raises / Exceptions + + This function does not invoke the NIF and does not raise. + + ## Examples + + iex> ExCodecs.Compression.Lz4.__codec_info__() + %ExCodecs.Codec{ + name: :lz4, + category: :compression, + module: ExCodecs.Compression.Lz4, + native?: true, + streaming?: false, + configurable?: false, + version: "lz4_flex-0.11" + } """ def __codec_info__ do %ExCodecs.Codec{ @@ -40,23 +66,91 @@ defmodule ExCodecs.Compression.Lz4 do } end - defp lz4_version, do: "1.10.x" + defp lz4_version, do: "lz4_flex-0.11" @doc """ - Encodes (compresses) data using LZ4. + Compresses a binary as a size-prepended `lz4_flex` block. + + ## Arguments + + * `data` (`binary()`) — uncompressed bytes + * `opts` (`term()`) — ignored by this direct function; callers using the + codec behaviour or registry API should pass the keyword list `[]` + + ## Returns + + * `{:ok, compressed :: binary()}` containing the uncompressed-size prefix + and LZ4 block + * `{:error, %ExCodecs.Error{reason: :invalid_data}}` when `data` is not a + binary, the NIF raises an argument error, or it returns an unexpected + value + * `{:error, %ExCodecs.Error{reason: :nif_not_loaded}}` when the native + library is unavailable + + ## Raises / Exceptions - LZ4 does not accept configuration options. + Argument guard failures and `ErlangError`/`ArgumentError` exceptions from the + NIF call are converted to error tuples. Unexpected exception classes may + propagate. + + ## Examples + + iex> payload = "temperature=21.7" + iex> {:ok, compressed} = ExCodecs.Compression.Lz4.encode(payload, []) + iex> byte_size(compressed) > 4 + true + iex> ExCodecs.Compression.Lz4.decode(compressed, []) + {:ok, "temperature=21.7"} """ @impl true def encode(data, _opts) when is_binary(data) do - ExCodecs.NIF.wrap(:lz4, ExCodecs.Native.lz4_compress(data)) + ExCodecs.NIF.safe_call(:lz4, fn -> ExCodecs.Native.lz4_compress(data) end) end + def encode(_data, _opts), do: {:error, ExCodecs.Error.new(:invalid_data, codec: :lz4)} + @doc """ - Decodes (decompresses) LZ4-compressed data. + Decompresses LZ4 size-prepended data. + + ## Arguments + + * `data` (`binary()`) — a size-prepended `lz4_flex` block, normally + produced by `encode/2` + * `opts` (`term()`) — ignored by this direct function; callers using the + codec behaviour or registry API should pass the keyword list `[]` + + ## Returns + + * `{:ok, decompressed :: binary()}` on success + * `{:error, %ExCodecs.Error{reason: :invalid_data}}` when `data` is not a + binary, the NIF raises an argument error, or it returns an unexpected + value + * `{:error, %ExCodecs.Error{reason: :decompression_failed}}` when the size + prefix or compressed block is corrupt, truncated, or incompatible + * `{:error, %ExCodecs.Error{reason: :nif_not_loaded}}` when the native + library is unavailable + + ## Raises / Exceptions + + Argument guard failures and `ErlangError`/`ArgumentError` exceptions from the + NIF call are converted to error tuples. Unexpected exception classes may + propagate. + + ## Examples + + iex> payload = <<1, 2, 3, 4, 5>> + iex> {:ok, compressed} = ExCodecs.Compression.Lz4.encode(payload, []) + iex> ExCodecs.Compression.Lz4.decode(compressed, []) + {:ok, <<1, 2, 3, 4, 5>>} + + iex> {:error, error} = ExCodecs.Compression.Lz4.decode(<<1, 2>>, []) + iex> error.reason + :decompression_failed """ @impl true def decode(data, _opts) when is_binary(data) do - ExCodecs.NIF.wrap(:lz4, ExCodecs.Native.lz4_decompress(data)) + ExCodecs.NIF.safe_call(:lz4, fn -> ExCodecs.Native.lz4_decompress(data) end) end + + def decode(_data, _opts), do: {:error, ExCodecs.Error.new(:invalid_data, codec: :lz4)} end diff --git a/lib/ex_codecs/compression/snappy.ex b/lib/ex_codecs/compression/snappy.ex index d921dee..b1d2184 100644 --- a/lib/ex_codecs/compression/snappy.ex +++ b/lib/ex_codecs/compression/snappy.ex @@ -1,20 +1,14 @@ defmodule ExCodecs.Compression.Snappy do @moduledoc """ - Snappy compression codec. + Standalone Snappy compression codec. - Snappy (formerly Zippy) is a fast compression algorithm developed by Google. - It prioritizes speed over compression ratio, achieving compression speeds - of over 500 MB/s and decompression speeds over 1.5 GB/s. + This is the **registry codec** `:snappy`. It is independent of Blosc2. + Do not confuse with `ExCodecs.encode(:blosc2, data, cname: :snappy)`, which + is rejected (Snappy is not a standard C-Blosc2 inner compressor here). - Snappy does not accept configuration options. It uses a fixed compression - strategy optimized for speed. + ## Options - ## Performance Characteristics - - * Very fast compression and decompression - * Lower compression ratio than Zstd or Bzip2 - * Minimal overhead — ideal for short-lived data - * Deterministic output for identical inputs + None. ## Examples @@ -27,7 +21,39 @@ defmodule ExCodecs.Compression.Snappy do @behaviour ExCodecs.Codec @doc """ - Returns codec metadata for the registry. + Returns the registry metadata for the standalone Snappy codec. + + ## Arguments + + This function takes no arguments. + + ## Returns + + An `ExCodecs.Codec.t()` with these Snappy-specific fields: + + * `name: :snappy` and `category: :compression` + * `module: ExCodecs.Compression.Snappy` + * `native?: true` because compression runs in a NIF + * `streaming?: false` because only complete buffers are supported + * `configurable?: false` because this codec has no options + * `version: "snap-1.1"` for the backend implementation + + ## Raises / Exceptions + + This function does not invoke the NIF and does not raise. + + ## Examples + + iex> ExCodecs.Compression.Snappy.__codec_info__() + %ExCodecs.Codec{ + name: :snappy, + category: :compression, + module: ExCodecs.Compression.Snappy, + native?: true, + streaming?: false, + configurable?: false, + version: "snap-1.1" + } """ def __codec_info__ do %ExCodecs.Codec{ @@ -41,23 +67,92 @@ defmodule ExCodecs.Compression.Snappy do } end - defp snappy_version, do: "1.1.x" + defp snappy_version, do: "snap-1.1" @doc """ - Encodes (compresses) data using Snappy. + Compresses a binary with Snappy. + + ## Arguments + + * `data` (`binary()`) — uncompressed bytes + * `opts` (`term()`) — ignored by this direct function; callers using the + codec behaviour or registry API should pass the keyword list `[]` + + ## Returns + + * `{:ok, compressed :: binary()}` containing a standalone Snappy block + * `{:error, %ExCodecs.Error{reason: :invalid_data}}` when `data` is not a + binary or the NIF raises an argument error + * `{:error, %ExCodecs.Error{reason: :compression_failed}}` when the native + compressor fails + * `{:error, %ExCodecs.Error{reason: :nif_not_loaded}}` when the native + library is unavailable + + ## Raises / Exceptions - Snappy does not accept configuration options. + Data guard failures and `ErlangError`/`ArgumentError` exceptions from the NIF + call are converted to error tuples. Because `opts` is ignored, this direct + function also accepts non-list option terms. Unexpected exception classes + may propagate. + + ## Examples + + iex> payload = :binary.copy("event,", 25) + iex> {:ok, compressed} = ExCodecs.Compression.Snappy.encode(payload, []) + iex> is_binary(compressed) + true + iex> ExCodecs.Compression.Snappy.decode(compressed, []) + {:ok, payload} """ @impl true def encode(data, _opts) when is_binary(data) do - ExCodecs.NIF.wrap(:snappy, ExCodecs.Native.snappy_compress(data)) + ExCodecs.NIF.safe_call(:snappy, fn -> ExCodecs.Native.snappy_compress(data) end) end + def encode(_data, _opts), do: {:error, ExCodecs.Error.new(:invalid_data, codec: :snappy)} + @doc """ - Decodes (decompresses) Snappy-compressed data. + Decompresses Snappy data. + + ## Arguments + + * `data` (`binary()`) — a standalone Snappy block, normally produced by + `encode/2` + * `opts` (`term()`) — ignored by this direct function; callers using the + codec behaviour or registry API should pass the keyword list `[]` + + ## Returns + + * `{:ok, decompressed :: binary()}` on success + * `{:error, %ExCodecs.Error{reason: :invalid_data}}` when `data` is not a + binary or the NIF raises an argument error + * `{:error, %ExCodecs.Error{reason: :decompression_failed}}` when `data` + is corrupt, truncated, or not a Snappy block + * `{:error, %ExCodecs.Error{reason: :nif_not_loaded}}` when the native + library is unavailable + + ## Raises / Exceptions + + Data guard failures and `ErlangError`/`ArgumentError` exceptions from the NIF + call are converted to error tuples. Because `opts` is ignored, this direct + function also accepts non-list option terms. Unexpected exception classes + may propagate. + + ## Examples + + iex> payload = <<10, 20, 30, 40>> + iex> {:ok, compressed} = ExCodecs.Compression.Snappy.encode(payload, []) + iex> ExCodecs.Compression.Snappy.decode(compressed, []) + {:ok, <<10, 20, 30, 40>>} + + iex> {:error, error} = ExCodecs.Compression.Snappy.decode("not snappy", []) + iex> error.reason + :decompression_failed """ @impl true def decode(data, _opts) when is_binary(data) do - ExCodecs.NIF.wrap(:snappy, ExCodecs.Native.snappy_decompress(data)) + ExCodecs.NIF.safe_call(:snappy, fn -> ExCodecs.Native.snappy_decompress(data) end) end + + def decode(_data, _opts), do: {:error, ExCodecs.Error.new(:invalid_data, codec: :snappy)} end diff --git a/lib/ex_codecs/compression/zstd.ex b/lib/ex_codecs/compression/zstd.ex index 796e5f2..0221728 100644 --- a/lib/ex_codecs/compression/zstd.ex +++ b/lib/ex_codecs/compression/zstd.ex @@ -8,16 +8,15 @@ defmodule ExCodecs.Compression.Zstd do ## Options - * `:level` — Compression level, 1-22 (default: 3). Higher levels produce - smaller output but take longer. - * `:window_log` — Window log size. Controls the maximum reference distance. + * `:level` — Compression level, 1-22 (default: 3). The pure-Rust backend + (`ruzstd`) currently maps all levels to a fast profile; higher values are + accepted for API stability and may gain finer control in future releases. ## Performance Characteristics - * Fast decompression across all compression levels - * Compression speed configurable via level - * Excellent ratio at moderate speeds - * Supports dictionary compression for small data + * Pure-Rust compress/decompress (no C libzstd) + * Fast decompression + * Block-level API only (`streaming?` is `false`) ## Examples @@ -36,7 +35,39 @@ defmodule ExCodecs.Compression.Zstd do @default_level 3 @doc """ - Returns codec metadata for the registry. + Returns the registry metadata for the Zstandard codec. + + ## Arguments + + This function takes no arguments. + + ## Returns + + An `ExCodecs.Codec.t()` with these Zstd-specific fields: + + * `name: :zstd` and `category: :compression` + * `module: ExCodecs.Compression.Zstd` + * `native?: true` because compression runs in a NIF + * `streaming?: false` because only complete frames are supported + * `configurable?: true` because `encode/2` accepts `:level` + * `version: "ruzstd-0.8"` for the backend implementation + + ## Raises / Exceptions + + This function does not invoke the NIF and does not raise. + + ## Examples + + iex> ExCodecs.Compression.Zstd.__codec_info__() + %ExCodecs.Codec{ + name: :zstd, + category: :compression, + module: ExCodecs.Compression.Zstd, + native?: true, + streaming?: false, + configurable?: true, + version: "ruzstd-0.8" + } """ def __codec_info__ do %ExCodecs.Codec{ @@ -44,41 +75,107 @@ defmodule ExCodecs.Compression.Zstd do category: :compression, module: __MODULE__, native?: true, - streaming?: true, + streaming?: false, configurable?: true, version: zstd_version() } end - @doc false - defp zstd_version, do: "1.5.x" + defp zstd_version, do: "ruzstd-0.8" @doc """ - Encodes (compresses) data using Zstd. + Compresses a binary with pure-Rust Zstd. - ## Options + ## Arguments + + * `data` (`binary()`) — uncompressed bytes + * `opts` (`keyword()`) — options containing `:level`, an integer from + `1` through `22`; the default is `3`. Unknown keys are ignored. + + ## Returns + + * `{:ok, frame :: binary()}` containing a Zstandard frame + * `{:error, %ExCodecs.Error{reason: :invalid_data}}` when `data` is not a + binary, `opts` is not a list, or the NIF raises an argument error + * `{:error, %ExCodecs.Error{reason: :invalid_options}}` when `:level` is + not an integer in `1..22` + * `{:error, %ExCodecs.Error{reason: :compression_failed}}` when the native + compressor fails + * `{:error, %ExCodecs.Error{reason: :nif_not_loaded}}` when the native + library is unavailable + + ## Raises / Exceptions + + Guard/option validation failures and `ErlangError`/`ArgumentError` + exceptions from the NIF call are converted to error tuples. Unexpected + exception classes may propagate. - * `:level` — Compression level 1-22 (default: 3) + ## Examples + + iex> payload = :binary.copy("telemetry,", 20) + iex> {:ok, compressed} = ExCodecs.Compression.Zstd.encode(payload, level: 9) + iex> is_binary(compressed) + true + iex> ExCodecs.Compression.Zstd.decode(compressed, []) + {:ok, payload} + + iex> {:error, error} = ExCodecs.Compression.Zstd.encode("data", level: 0) + iex> error.reason + :invalid_options """ @impl true def encode(data, opts) when is_binary(data) and is_list(opts) do level = Keyword.get(opts, :level, @default_level) with :ok <- validate_level(level) do - ExCodecs.NIF.wrap(:zstd, ExCodecs.Native.zstd_compress(data, level)) + ExCodecs.NIF.safe_call(:zstd, fn -> ExCodecs.Native.zstd_compress(data, level) end) end end + def encode(_data, _opts), do: {:error, ExCodecs.Error.new(:invalid_data, codec: :zstd)} + @doc """ - Decodes (decompresses) Zstd-compressed data. + Decompresses a Zstd frame binary. + + ## Arguments + + * `data` (`binary()`) — a complete Zstandard frame + * `opts` (`keyword()`) — currently ignored, but must be a list; pass `[]` - The decompressed size is read from the frame header. + ## Returns + + * `{:ok, decompressed :: binary()}` on success + * `{:error, %ExCodecs.Error{reason: :invalid_data}}` when `data` is not a + binary, `opts` is not a list, or the NIF raises an argument error + * `{:error, %ExCodecs.Error{reason: :decompression_failed}}` when `data` + is corrupt, truncated, or not a Zstandard frame + * `{:error, %ExCodecs.Error{reason: :nif_not_loaded}}` when the native + library is unavailable + + ## Raises / Exceptions + + Guard failures and `ErlangError`/`ArgumentError` exceptions from the NIF + call are converted to error tuples. Unexpected exception classes may + propagate. + + ## Examples + + iex> payload = <<0, 10, 20, 30, 40>> + iex> {:ok, compressed} = ExCodecs.Compression.Zstd.encode(payload, []) + iex> ExCodecs.Compression.Zstd.decode(compressed, []) + {:ok, <<0, 10, 20, 30, 40>>} + + iex> {:error, error} = ExCodecs.Compression.Zstd.decode("not zstd", []) + iex> error.reason + :decompression_failed """ @impl true def decode(data, opts) when is_binary(data) and is_list(opts) do - ExCodecs.NIF.wrap(:zstd, ExCodecs.Native.zstd_decompress(data)) + ExCodecs.NIF.safe_call(:zstd, fn -> ExCodecs.Native.zstd_decompress(data) end) end + def decode(_data, _opts), do: {:error, ExCodecs.Error.new(:invalid_data, codec: :zstd)} + defp validate_level(level) when is_integer(level) and level >= 1 and level <= 22, do: :ok defp validate_level(_), diff --git a/lib/ex_codecs/error.ex b/lib/ex_codecs/error.ex index 16c7edb..fa60fa9 100644 --- a/lib/ex_codecs/error.ex +++ b/lib/ex_codecs/error.ex @@ -1,12 +1,62 @@ defmodule ExCodecs.Error do @moduledoc """ - Standardized error types for ExCodecs. + Structured errors for ExCodecs public APIs. - All ExCodecs functions return `{:ok, result}` or `{:error, reason}` tuples. - The `reason` will be one of the atoms defined in this module, or a structured - error when additional context is needed. + Successful operations return `{:ok, result}`. Failures return + `{:error, %ExCodecs.Error{}}` (except `codec_info/1`, which uses + `{:error, :unsupported_codec}` for historical reasons). + + `%ExCodecs.Error{}` is both the structured error value returned in tagged + tuples and an exception that can be raised explicitly. Its fields are: + + * `reason` (`error_reason()`) — stable, machine-readable reason + * `message` (`String.t()`) — human-readable exception message + * `codec` (`atom() | nil`) — related codec or format, when known + * `details` (`term() | nil`) — optional backend or I/O diagnostic data + + For example: + + iex> error = ExCodecs.Error.new(:invalid_options, codec: :zstd, details: [level: 99]) + iex> {error.reason, error.codec, error.details} + {:invalid_options, :zstd, [level: 99]} + + | Reason | Meaning | + |--------|---------| + | `:unsupported_codec` | Codec/format atom unknown | + | `:codec_unavailable` | Known but NIF/module not loadable | + | `:invalid_data` | Wrong type or corrupt payload | + | `:invalid_options` | Bad keyword options | + | `:compression_failed` | Native compress failed | + | `:decompression_failed` | Native decompress failed | + | `:nif_not_loaded` | NIF library missing | + | `:io_error` | File read/write failure | + | `:truncated_input` | Incomplete binary | + + ## As exception + + `defexception` is defined so `raise error` works, but library code prefers + tagged tuples. `Exception.message/1` returns the `message` field. """ + @typedoc """ + Stable reason atom carried by `t:ExCodecs.Error.t/0`. + + * `:unsupported_codec` — codec or format is not known + * `:codec_unavailable` — codec is known but its module or NIF is unavailable + * `:invalid_data` — input has the wrong type, shape, or semantic content + * `:invalid_options` — an option name or value is invalid + * `:compression_failed` — encoding backend failed + * `:decompression_failed` — decoding backend failed or rejected corruption + * `:nif_not_loaded` — native library could not be loaded + * `:io_error` — file operation failed + * `:truncated_input` — encoded input ended before a complete value + + ## Example + + iex> reason = ExCodecs.Error.new(:truncated_input).reason + iex> reason in [:truncated_input, :invalid_data] + true + """ @type error_reason :: :unsupported_codec | :codec_unavailable @@ -15,7 +65,21 @@ defmodule ExCodecs.Error do | :compression_failed | :decompression_failed | :nif_not_loaded + | :io_error + | :truncated_input + @typedoc """ + Structured ExCodecs error and exception. + + The fields are `reason` (machine-readable reason), `message` (display text), + `codec` (associated codec or `nil`), and `details` (diagnostic term or `nil`). + + ## Example + + iex> %ExCodecs.Error{} = error = ExCodecs.Error.new(:io_error, details: :enoent) + iex> Exception.message(error) + "An I/O error occurred" + """ @type t :: %__MODULE__{ reason: error_reason(), message: String.t(), @@ -26,7 +90,27 @@ defmodule ExCodecs.Error do defexception [:reason, :message, :codec, :details] @doc """ - Creates a new error struct. + Builds a `%ExCodecs.Error{}`. + + ## Arguments + + * `reason` (`error_reason()`) — reason used for matching and to select the + default message + * `opts` (`keyword()`) — optional fields: + * `:message` (`String.t()`) — replaces the default message + * `:codec` (`atom() | nil`) — identifies the related codec + * `:details` (`term()`) — stores arbitrary diagnostic context + + ## Returns + + A `t:ExCodecs.Error.t/0` struct. This function never returns an error tuple. + + ## Raises + + Does not raise when called with the declared types. An improper `opts` value + can raise `FunctionClauseError`. + + ## Examples iex> error = ExCodecs.Error.new(:unsupported_codec) iex> error.reason @@ -51,7 +135,25 @@ defmodule ExCodecs.Error do end @doc """ - Creates an `{:error, ExCodecs.Error.t()}` tuple. + Builds `{:error, %ExCodecs.Error{}}`. + + ## Arguments + + * `reason` (`error_reason()`) — reason passed to `new/2` + * `opts` (`keyword()`) — message, codec, and details options accepted by + `new/2` + + ## Returns + + Always `{:error, t()}`. It has no alternative error reason because the + supplied `reason` is stored inside the struct. + + ## Raises + + Does not raise when called with the declared types. An improper `opts` value + can raise `FunctionClauseError`. + + ## Examples iex> {:error, error} = ExCodecs.Error.error(:unsupported_codec) iex> error.reason @@ -69,13 +171,54 @@ defmodule ExCodecs.Error do defp default_message(:compression_failed), do: "Compression failed" defp default_message(:decompression_failed), do: "Decompression failed" defp default_message(:nif_not_loaded), do: "The native NIF library is not loaded" + defp default_message(:io_error), do: "An I/O error occurred" + defp default_message(:truncated_input), do: "The input was truncated or incomplete" defp default_message(reason), do: "Error: #{reason}" @impl true + @doc """ + Exception message string (for `raise` / `Exception.message/1`). + + ## Arguments + + * `error` (`t()`) — exception whose `message` field is returned + + ## Returns + + The `message` field as a `String.t()`. + + ## Raises + + Does not raise for a `t()` whose `message` field is a string. A value that + does not match `%ExCodecs.Error{}` raises `FunctionClauseError`. + + ## Example + + iex> error = ExCodecs.Error.new(:invalid_data, message: "not a point cloud") + iex> Exception.message(error) + "not a point cloud" + """ def message(%__MODULE__{message: message}), do: message @doc """ - Checks if an error matches a specific reason. + Returns whether an `{:error, %Error{}}` tuple matches `reason`. + + ## Arguments + + * `result` (`{:error, t()} | term()`) — result to inspect; nonmatching + terms are accepted and return `false` + * `reason` (`error_reason()`) — reason that must exactly equal the error's + `reason` field + + ## Returns + + `true` if `result` is `{:error, %Error{reason: ^reason}}`, else `false`. + + ## Raises + + None; the catch-all clause returns `false` for values of any shape. + + ## Examples iex> {:error, error} = ExCodecs.Error.error(:unsupported_codec) iex> ExCodecs.Error.matches?({:error, error}, :unsupported_codec) diff --git a/lib/ex_codecs/native.ex b/lib/ex_codecs/native.ex index f262ddb..f8da65f 100644 --- a/lib/ex_codecs/native.ex +++ b/lib/ex_codecs/native.ex @@ -65,8 +65,43 @@ defmodule ExCodecs.Native do @doc false def codec_versions, do: :erlang.nif_error(:nif_not_loaded) - @doc false - def nif_loaded?, do: not function_exported?(__MODULE__, :zstd_compress, 2) + @doc """ + Returns `true` when the native NIF library is loaded. + + The check calls the native `codec_versions/0` function and verifies that it + returns a map. This function is primarily useful for startup diagnostics; + public compression calls already convert an unavailable NIF into + `%ExCodecs.Error{reason: :nif_not_loaded}`. + + ## Arguments + + This function takes no arguments. + + ## Returns + + * `true` when the native library responds with its codec-version map. + * `false` when the NIF stub raises `ErlangError` or `ArgumentError`. + + ## Raises + + Expected NIF-loading errors are caught. An exception of another class raised + by the native implementation is not caught and propagates to the caller. + + ## Example + + iex> loaded? = ExCodecs.Native.nif_loaded?() + iex> is_boolean(loaded?) + true + """ + @spec nif_loaded?() :: boolean() + def nif_loaded? do + try do + is_map(codec_versions()) + rescue + ErlangError -> false + ArgumentError -> false + end + end end # coveralls-ignore-stop diff --git a/lib/ex_codecs/nif.ex b/lib/ex_codecs/nif.ex index bcbb451..22ce255 100644 --- a/lib/ex_codecs/nif.ex +++ b/lib/ex_codecs/nif.ex @@ -7,9 +7,9 @@ defmodule ExCodecs.NIF do NIF functions return `{:error, atom}` tuples. This helper converts them into `{:error, %ExCodecs.Error{}}` tuples for consistent error handling. """ - @spec wrap(atom(), {:ok, binary()} | {:error, atom()}) :: + @spec wrap(atom(), {:ok, binary()} | {:error, atom()} | term()) :: {:ok, binary()} | {:error, ExCodecs.Error.t()} - def wrap(_codec, {:ok, data}), do: {:ok, data} + def wrap(_codec, {:ok, data}) when is_binary(data), do: {:ok, data} def wrap(codec, {:error, :compression_failed}), do: {:error, ExCodecs.Error.new(:compression_failed, codec: codec)} @@ -23,5 +23,34 @@ defmodule ExCodecs.NIF do def wrap(codec, {:error, :invalid_options}), do: {:error, ExCodecs.Error.new(:invalid_options, codec: codec)} - def wrap(codec, {:error, reason}), do: {:error, ExCodecs.Error.new(reason, codec: codec)} + def wrap(codec, {:error, reason}) when is_atom(reason), + do: {:error, ExCodecs.Error.new(reason, codec: codec)} + + def wrap(codec, other) do + {:error, + ExCodecs.Error.new(:invalid_data, + codec: codec, + message: "Unexpected NIF return: #{inspect(other)}" + )} + end + + @doc """ + Invokes a zero-arity NIF function and wraps ErlangError/`nif_not_loaded`. + """ + @spec safe_call(atom(), (-> term())) :: {:ok, term()} | {:error, ExCodecs.Error.t()} + def safe_call(codec, fun) when is_function(fun, 0) do + wrap(codec, fun.()) + rescue + e in ErlangError -> + case e.original do + :nif_not_loaded -> + {:error, ExCodecs.Error.new(:nif_not_loaded, codec: codec)} + + other -> + {:error, ExCodecs.Error.new(:invalid_data, codec: codec, details: other)} + end + + e in ArgumentError -> + {:error, ExCodecs.Error.new(:invalid_data, codec: codec, message: Exception.message(e))} + end end diff --git a/lib/ex_codecs/spatial.ex b/lib/ex_codecs/spatial.ex new file mode 100644 index 0000000..6c5b3db --- /dev/null +++ b/lib/ex_codecs/spatial.ex @@ -0,0 +1,355 @@ +defmodule ExCodecs.Spatial do + @moduledoc """ + Spatial category module — point clouds and Gaussian splats. + + Namespace for domain types and formats. The framework’s primary + `ExCodecs.encode/3` / `decode/3` stay **codec atom + binary** only; this + module is not a second competing public protocol. + + ## Domain types + + | Struct | Role | + |--------|------| + | `ExCodecs.Spatial.Point` | XYZ (+ color, normal, attributes) | + | `ExCodecs.Spatial.PointCloud` | List of points + bounds/metadata | + | `ExCodecs.Spatial.Gaussian` | Single splat primitive | + | `ExCodecs.Spatial.GaussianCloud` | List of Gaussians | + | `ExCodecs.Spatial.Bounds` | Axis-aligned bounding box | + | `ExCodecs.Spatial.Transform` | Translation/rotation/scale metadata | + | `ExCodecs.Spatial.Metadata` | Comments and free-form entries | + + ## Formats + + | Atom | Module | Input type | + |------|--------|------------| + | `:ply` | `ExCodecs.Spatial.Codec.PLY` | PointCloud or GaussianCloud | + | `:spatial_binary` | `ExCodecs.Spatial.Codec.Binary` | PointCloud (`EXCP`) | + | `:gsplat` | `ExCodecs.Spatial.Codec.Gsplat` | GaussianCloud (`GSPL`) | + + Formats are **not** in `ExCodecs.available_codecs/0`. + + ## Quick start + + alias ExCodecs.Spatial.{Point, PointCloud} + + cloud = + PointCloud.new([ + Point.new(0.0, 0.0, 0.0, color: {255, 0, 0}), + Point.new(1.0, 1.0, 1.0, color: {0, 255, 0}) + ]) + + {:ok, ply} = ExCodecs.Spatial.encode(cloud, format: :ply) + {:ok, decoded} = ExCodecs.Spatial.decode(ply, format: :ply) + + ## Streaming note + + `stream_decode` / `stream_encode` currently materialize full payloads, then + enumerate. Prefer `source: :file` when the argument is a path. + """ + + alias ExCodecs.Error + alias ExCodecs.Spatial.{GaussianCloud, PointCloud} + alias ExCodecs.Spatial.Codec.{Binary, Gsplat, PLY} + + @formats [:ply, :spatial_binary, :gsplat] + + @doc """ + Lists the spatial formats accepted by this module. + + ## Arguments + + This function takes no arguments. + + ## Returns + + The list `[:ply, :spatial_binary, :gsplat]`, where `:ply` supports point and + Gaussian clouds, `:spatial_binary` supports point clouds, and `:gsplat` + supports Gaussian clouds. + + ## Raises / exceptions + + This function does not raise. + + ## Examples + + iex> ExCodecs.Spatial.available_formats() + [:ply, :spatial_binary, :gsplat] + """ + @spec available_formats() :: [atom()] + def available_formats, do: @formats + + @doc """ + Tests whether an atom names a supported spatial format. + + ## Arguments + + * `format` (`atom()`) — the candidate format name. + + ## Returns + + `true` for `:ply`, `:spatial_binary`, or `:gsplat`; otherwise `false`. + + ## Raises / exceptions + + Raises `FunctionClauseError` when `format` is not an atom because the public + function is guarded with `is_atom/1`. + + ## Examples + + iex> ExCodecs.Spatial.supports?(:ply) + true + + iex> ExCodecs.Spatial.supports?(:sog) + false + """ + @spec supports?(atom()) :: boolean() + def supports?(format) when is_atom(format), do: format in @formats + + @doc """ + Encodes a point cloud or Gaussian cloud in a selected spatial format. + + ## Arguments + + * `data` (`PointCloud.t() | GaussianCloud.t()`) — a point cloud for + `:ply` or `:spatial_binary`, or a Gaussian cloud for `:ply` or `:gsplat`. + * `opts` (`keyword()`) — options passed to the selected codec: + * `:format` — spatial container: `:ply` (default), `:spatial_binary`, or + `:gsplat`. This key is removed before codec dispatch. + * for PLY, `:ply_format` selects `:ascii`, `:binary`, `:binary_le`, or + `:binary_be`; `:comments` overrides metadata comments. + * the binary and GSPL codecs currently ignore remaining options. + + `%PointCloud{}` contains a list of `%Point{}` values; `%GaussianCloud{}` + contains a list of `%Gaussian{}` values. See the selected codec for the + fields represented on the wire. + + ## Returns + + * `{:ok, payload}` where `payload` is the encoded `binary()`. + * `{:error, %ExCodecs.Error{reason: :invalid_data}}` when `data` is not a + supported cloud, the cloud type does not match the format, a PLY value + cannot be encoded, or a malformed struct causes PLY encoding to fail. + * `{:error, %ExCodecs.Error{reason: :unsupported_codec}}` when `:format` + is not one of the supported spatial format atoms. + + ## Raises / exceptions + + Validation errors above are returned. `Keyword.pop/3` raises + `FunctionClauseError` when `opts` is not a proper keyword list. EXCP and GSPL + encoding can also raise exceptions such as `MatchError`, `FunctionClauseError`, + or `ArgumentError` when callers manually construct malformed cloud/member + structs whose tuple shapes or numeric values violate the documented struct + contracts. PLY catches encoding exceptions and returns `:invalid_data`. + + ## Examples + + iex> alias ExCodecs.Spatial.{Point, PointCloud} + iex> cloud = PointCloud.new([Point.new(1.0, 2.0, 3.0)]) + iex> {:ok, bin} = ExCodecs.Spatial.encode(cloud, format: :ply) + iex> is_binary(bin) + true + """ + @spec encode(PointCloud.t() | GaussianCloud.t(), keyword()) :: + {:ok, binary()} | {:error, Error.t()} + def encode(data, opts \\ []) + + def encode(%PointCloud{} = data, opts) do + {format, codec_opts} = Keyword.pop(opts, :format, :ply) + + case format do + :ply -> + PLY.encode(data, codec_opts) + + :spatial_binary -> + Binary.encode(data, codec_opts) + + :gsplat -> + {:error, + Error.new(:invalid_data, + codec: :gsplat, + message: "GSPLAT format requires a GaussianCloud" + )} + + other -> + {:error, Error.new(:unsupported_codec, codec: other)} + end + end + + def encode(%GaussianCloud{} = data, opts) do + {format, codec_opts} = Keyword.pop(opts, :format, :ply) + + case format do + :ply -> + PLY.encode(data, codec_opts) + + :gsplat -> + Gsplat.encode(data, codec_opts) + + :spatial_binary -> + {:error, + Error.new(:invalid_data, + codec: :spatial_binary, + message: "spatial_binary format requires a PointCloud" + )} + + other -> + {:error, Error.new(:unsupported_codec, codec: other)} + end + end + + def encode(_, _) do + {:error, + Error.new(:invalid_data, + message: "Spatial encode expects a PointCloud or GaussianCloud" + )} + end + + @doc """ + Decodes a spatial payload into a point cloud or Gaussian cloud. + + ## Arguments + + * `data` (`binary()`) — a complete encoded payload. + * `opts` (`keyword()`) — decode options: + * `:format` — `:ply` (default), `:spatial_binary`, or `:gsplat`. + * `:as` — PLY interpretation: `:auto` (default), `:point_cloud`, or + `:gaussian_cloud`. In `:auto`, Gaussian property names select a + `%GaussianCloud{}`; other vertex schemas select a `%PointCloud{}`. + + ## Returns + + * `{:ok, %PointCloud{}}` for EXCP or point-oriented PLY. + * `{:ok, %GaussianCloud{}}` for GSPL or Gaussian-oriented PLY. + * `{:error, %ExCodecs.Error{reason: :invalid_data}}` for a non-binary + input, bad magic/version, malformed or unsupported PLY header/property, + missing/truncated records, or otherwise invalid payload. + * `{:error, %ExCodecs.Error{reason: :unsupported_codec}}` for an unknown + `:format`. + + ## Raises / exceptions + + Payload validation failures are returned. `Keyword.pop/3` and codec option + access raise `FunctionClauseError` when `opts` is not a proper keyword list. + For PLY, an unsupported `:as` value has no matching interpretation clause + and raises `CaseClauseError`; malformed ASCII rows can also surface + constructor/shape exceptions instead of an error tuple. + + ## Examples + + iex> alias ExCodecs.Spatial.{Point, PointCloud} + iex> {:ok, bin} = ExCodecs.Spatial.encode(PointCloud.new([Point.new(0.0, 0.0, 1.0)]), format: :ply) + iex> {:ok, %PointCloud{points: points}} = ExCodecs.Spatial.decode(bin, format: :ply) + iex> length(points) + 1 + """ + @spec decode(binary(), keyword()) :: + {:ok, PointCloud.t() | GaussianCloud.t()} | {:error, Error.t()} + def decode(data, opts \\ []) + + def decode(data, opts) when is_binary(data) do + {format, codec_opts} = Keyword.pop(opts, :format, :ply) + + case format do + :ply -> PLY.decode(data, codec_opts) + :spatial_binary -> Binary.decode(data, codec_opts) + :gsplat -> Gsplat.decode(data, codec_opts) + other -> {:error, Error.new(:unsupported_codec, codec: other)} + end + end + + def decode(_, _) do + {:error, Error.new(:invalid_data, message: "Spatial decode expects a binary")} + end + + @doc """ + Returns an enumerable over points or Gaussians decoded from a path or binary. + + Despite the name, decoding currently materializes the complete payload and + decoded cloud before yielding elements. + + ## Arguments + + * `source` (`Path.t() | binary()`) — a filesystem path or encoded payload. + Since paths are binaries in Elixir, use `source: :file` to force path + interpretation or `source: :binary` to force payload interpretation. + * `opts` (`keyword()`) — requires `:format` (`:ply`, + `:spatial_binary`, or `:gsplat`). `:source` may be `:auto` (default), + `:file`, or `:binary`; remaining options go to the selected decoder. + + ## Returns + + An `Enumerable.t()` yielding `%Point{}` or `%Gaussian{}`. On failure it + yields exactly one `{:error, %ExCodecs.Error{}}` element: + + * `reason: :invalid_options` when `:format` is missing. + * `reason: :unsupported_codec` for an unknown format. + * `reason: :io_error` when a forced or auto-detected file cannot be read. + * `reason: :invalid_data` for malformed, unsupported, or truncated data. + + ## Raises / exceptions + + Missing `:format` is represented by an error element. Keyword operations + raise `FunctionClauseError` for a non-keyword `opts`. PLY only accepts a + binary/path source and raises `FunctionClauseError` otherwise. Invalid + `:source` values can raise `CaseClauseError`. Exceptions documented by the + selected decoder can occur while the returned stream is enumerated. + + ## Examples + + iex> alias ExCodecs.Spatial.{Point, PointCloud} + iex> {:ok, bin} = ExCodecs.Spatial.encode(PointCloud.new([Point.new(1.0, 0.0, 0.0)]), format: :ply) + iex> list = ExCodecs.Spatial.stream_decode(bin, format: :ply) |> Enum.to_list() + iex> match?([%Point{}], list) + true + """ + @spec stream_decode(Path.t() | binary(), keyword()) :: Enumerable.t() + def stream_decode(source, opts \\ []) do + ExCodecs.Spatial.Stream.decode(source, opts) + end + + @doc """ + Encodes an enumerable of points or Gaussians to one spatial payload. + + The enumerable is fully collected so the codec can write the element count. + A non-empty enumerable is classified by its first element and must contain + valid values of that same struct type. An empty enumerable becomes an empty + point cloud for PLY/EXCP or an empty Gaussian cloud for GSPL. + + ## Arguments + + * `enumerable` (`Enumerable.t()`) — `%Point{}` or `%Gaussian{}` elements. + * `opts` (`keyword()`) — requires `:format` (`:ply`, + `:spatial_binary`, or `:gsplat`); remaining options are the same as + `encode/2`. + + ## Returns + + * `{:ok, payload}` where `payload` is a `binary()`. + * `{:error, %ExCodecs.Error{reason: :invalid_options}}` when `:format` is + missing. + * `{:error, %ExCodecs.Error{reason: :unsupported_codec}}` for an unknown + format. + * `{:error, %ExCodecs.Error{reason: :invalid_data}}` when the first element + is not a point/Gaussian, is an error tuple, the primitive type does not + match the format, or codec encoding fails. + + ## Raises / exceptions + + Missing `:format` is returned as `:invalid_options`. `Enum.to_list/1` may + raise `Protocol.UndefinedError` for a non-enumerable or propagate an + exception raised by the enumerable. Keyword operations raise + `FunctionClauseError` for invalid `opts`; malformed member structs may raise + the codec exceptions described by `encode/2`. + + ## Examples + + iex> alias ExCodecs.Spatial.Point + iex> {:ok, bin} = ExCodecs.Spatial.stream_encode([Point.new(0.0, 0.0, 0.0)], format: :spatial_binary) + iex> is_binary(bin) + true + """ + @spec stream_encode(Enumerable.t(), keyword()) :: {:ok, binary()} | {:error, Error.t()} + def stream_encode(enumerable, opts \\ []) do + ExCodecs.Spatial.Stream.encode(enumerable, opts) + end +end diff --git a/lib/ex_codecs/spatial/bounds.ex b/lib/ex_codecs/spatial/bounds.ex new file mode 100644 index 0000000..13217af --- /dev/null +++ b/lib/ex_codecs/spatial/bounds.ex @@ -0,0 +1,215 @@ +defmodule ExCodecs.Spatial.Bounds do + @moduledoc """ + An axis-aligned bounding box. + + ## Fields + + * `:min_x`, `:min_y`, `:min_z` — `float()` lower Cartesian limits. + * `:max_x`, `:max_y`, `:max_z` — `float()` upper Cartesian limits. + + All six fields are enforced when constructing a literal struct. Their raw + `defstruct` defaults are `nil`, but `new/2` stores floats. Units are + application-defined and must match the bounded coordinates. Bounds are + inclusive, and this module does not require each minimum to be no greater + than its corresponding maximum. + + ## Example + + iex> alias ExCodecs.Spatial.Bounds + iex> bounds = Bounds.new({-1, 0, 2}, {4, 5, 8}) + iex> {Bounds.center(bounds), Bounds.contains?(bounds, {0, 1, 3})} + {{1.5, 2.5, 5.0}, true} + """ + + @typedoc """ + An inclusive axis-aligned bounding box. See the module documentation for + every field, defaults, units and conventions, and a construction example. + """ + @type t :: %__MODULE__{ + min_x: float(), + min_y: float(), + min_z: float(), + max_x: float(), + max_y: float(), + max_z: float() + } + + @enforce_keys [:min_x, :min_y, :min_z, :max_x, :max_y, :max_z] + defstruct [:min_x, :min_y, :min_z, :max_x, :max_y, :max_z] + + @doc """ + Builds bounds from min and max corners. + + ## Arguments + + * `min` — numeric `{min_x, min_y, min_z}` lower corner in + application-defined coordinate units. + * `max` — numeric `{max_x, max_y, max_z}` upper corner in the same units. + + ## Returns + + `%Bounds{}` + + ## Raises + + * `FunctionClauseError` if either argument is not a 3-tuple. + * `ArithmeticError` if any component is not numeric. + + ## Examples + + iex> b = ExCodecs.Spatial.Bounds.new({0, 0, 0}, {1, 2, 3}) + iex> b.max_z + 3.0 + """ + @spec new( + {number(), number(), number()}, + {number(), number(), number()} + ) :: t() + def new({min_x, min_y, min_z}, {max_x, max_y, max_z}) do + %__MODULE__{ + min_x: min_x * 1.0, + min_y: min_y * 1.0, + min_z: min_z * 1.0, + max_x: max_x * 1.0, + max_y: max_y * 1.0, + max_z: max_z * 1.0 + } + end + + @doc """ + Computes bounds from points or `{x,y,z}` tuples. + + ## Arguments + + * `points` — `Enumerable.t()` of maps/structs with numeric `:x`, `:y`, + and `:z` fields, or numeric `{x, y, z}` tuples. + + ## Returns + + `%Bounds{}` or `nil` if empty + + ## Raises + + * `Protocol.UndefinedError` if `points` is not enumerable. + * `FunctionClauseError` if an element is not a supported point-like value. + * `ArithmeticError` if a map/struct coordinate is not numeric. + + ## Examples + + iex> ExCodecs.Spatial.Bounds.from_points([]) + nil + iex> b = ExCodecs.Spatial.Bounds.from_points([{0, 0, 0}, {1, 1, 1}]) + iex> b.max_x + 1.0 + """ + @spec from_points(Enumerable.t()) :: t() | nil + def from_points(points) do + Enum.reduce(points, nil, fn point, acc -> + {x, y, z} = coords(point) + + case acc do + nil -> + new({x, y, z}, {x, y, z}) + + %__MODULE__{} = b -> + %__MODULE__{ + min_x: min(b.min_x, x), + min_y: min(b.min_y, y), + min_z: min(b.min_z, z), + max_x: max(b.max_x, x), + max_y: max(b.max_y, y), + max_z: max(b.max_z, z) + } + end + end) + end + + @doc """ + Center point of the box. + + ## Arguments + + * `bounds` — `%Bounds{}` + + ## Returns + + `{cx, cy, cz}` floats + + ## Raises + + * `FunctionClauseError` if `bounds` is not a `%Bounds{}`. + * `ArithmeticError` if a manually constructed bounds has non-numeric fields. + + ## Examples + + iex> ExCodecs.Spatial.Bounds.center(ExCodecs.Spatial.Bounds.new({0, 0, 0}, {2, 2, 2})) + {1.0, 1.0, 1.0} + """ + @spec center(t()) :: {float(), float(), float()} + def center(%__MODULE__{} = b) do + {(b.min_x + b.max_x) / 2.0, (b.min_y + b.max_y) / 2.0, (b.min_z + b.max_z) / 2.0} + end + + @doc """ + Extents `{dx, dy, dz}`. + + ## Arguments + + * `bounds` — `%Bounds{}` + + ## Returns + + `{float(), float(), float()}` + + ## Raises + + * `FunctionClauseError` if `bounds` is not a `%Bounds{}`. + * `ArithmeticError` if a manually constructed bounds has non-numeric fields. + + ## Examples + + iex> ExCodecs.Spatial.Bounds.size(ExCodecs.Spatial.Bounds.new({0, 0, 0}, {1, 2, 3})) + {1.0, 2.0, 3.0} + """ + @spec size(t()) :: {float(), float(), float()} + def size(%__MODULE__{} = b) do + {b.max_x - b.min_x, b.max_y - b.min_y, b.max_z - b.min_z} + end + + @doc """ + Whether `{x,y,z}` lies inside or on the box. + + ## Arguments + + * `bounds` — `%Bounds{}` + * `point` — `{number(), number(), number()}` in the bounds' coordinate + units. + + ## Returns + + boolean + + ## Raises + + * `FunctionClauseError` unless the arguments are a `%Bounds{}` and a + 3-tuple. Elixir term ordering is otherwise used for non-numeric values + supplied outside the documented types. + + ## Examples + + iex> b = ExCodecs.Spatial.Bounds.new({0, 0, 0}, {1, 1, 1}) + iex> ExCodecs.Spatial.Bounds.contains?(b, {0.5, 0.5, 0.5}) + true + """ + @spec contains?(t(), {number(), number(), number()}) :: boolean() + def contains?(%__MODULE__{} = b, {x, y, z}) do + x >= b.min_x and x <= b.max_x and + y >= b.min_y and y <= b.max_y and + z >= b.min_z and z <= b.max_z + end + + defp coords(%{x: x, y: y, z: z}), do: {x * 1.0, y * 1.0, z * 1.0} + + defp coords({x, y, z}) when is_number(x) and is_number(y) and is_number(z), + do: {x * 1.0, y * 1.0, z * 1.0} +end diff --git a/lib/ex_codecs/spatial/codec/binary.ex b/lib/ex_codecs/spatial/codec/binary.ex new file mode 100644 index 0000000..786ddff --- /dev/null +++ b/lib/ex_codecs/spatial/codec/binary.ex @@ -0,0 +1,311 @@ +defmodule ExCodecs.Spatial.Codec.Binary do + @moduledoc """ + Compact little-endian binary format for point clouds. + + ## Layout + + magic: "EXCP" (4 bytes) + version: u16 LE = 1 + flags: u16 LE (bit0=color, bit1=alpha, bit2=normal) + count: u64 LE + records: count × record + + Each record always has `x,y,z` as `f32`. Optional `rgb`/`rgba` as `u8` + and normals as `f32` follow according to flags. + + Generic attributes are not stored in this format — use PLY for that. + """ + + alias ExCodecs.Error + alias ExCodecs.Spatial.{Point, PointCloud, Metadata} + + @magic "EXCP" + @version 1 + + @flag_color 0b001 + @flag_alpha 0b010 + @flag_normal 0b100 + + @doc """ + Encodes a point cloud in the EXCP version 1 binary format. + + The 16-byte header is `"EXCP"`, version `u16` little-endian, global flags + `u16` little-endian, and point count `u64` little-endian. Each record starts + with three little-endian `f32` coordinates. Global flag bits then add RGB + (3 bytes), RGBA (4 bytes; alpha takes precedence), and/or three little-endian + `f32` normal components to every record. + + Flags are selected from the whole cloud. Consequently, points missing an + optional field are zero-filled (missing alpha is 255). Point attributes, + cloud bounds, transform, and metadata are not represented. + + ## Arguments + + * `data` (`PointCloud.t()`) — a cloud whose `points` are valid `%Point{}` + structs with numeric coordinates, optional `{r, g, b}` or + `{r, g, b, a}` color, and optional `{nx, ny, nz}` normal. + * `opts` (`keyword()`) — reserved and currently ignored. + + ## Returns + + * `{:ok, payload}` where `payload` is an EXCP `binary()`. + * `{:error, %ExCodecs.Error{reason: :invalid_data, + codec: :spatial_binary}}` when `data` is not a `%PointCloud{}`. + + ## Raises / exceptions + + A wrong top-level type is returned as `:invalid_data`. Because `opts` is + ignored, even a non-keyword value does not raise. Manually malformed cloud or + point structs can raise `FunctionClauseError`, `MatchError`, `ArgumentError`, + or a bitstring construction exception when a point, tuple shape, channel + range, or numeric field violates the struct contract. + + ## Examples + + iex> alias ExCodecs.Spatial.{Point, PointCloud} + iex> cloud = PointCloud.new([Point.new(1, 2, 3, color: {10, 20, 30})]) + iex> {:ok, <<"EXCP", 1::little-16, flags::little-16, 1::little-64, _::binary>>} = + ...> ExCodecs.Spatial.Codec.Binary.encode(cloud) + iex> Bitwise.band(flags, 0b001) + 1 + """ + @spec encode(PointCloud.t(), keyword()) :: {:ok, binary()} | {:error, Error.t()} + def encode(data, opts \\ []) + + def encode(%PointCloud{points: points}, _opts) do + has_color? = Enum.any?(points, &Point.colored?/1) + has_alpha? = Enum.any?(points, fn p -> match?({_, _, _, _}, p.color) end) + has_normal? = Enum.any?(points, &Point.has_normal?/1) + + flags = + 0 + |> then(fn f -> if has_color?, do: Bitwise.bor(f, @flag_color), else: f end) + |> then(fn f -> if has_alpha?, do: Bitwise.bor(f, @flag_alpha), else: f end) + |> then(fn f -> if has_normal?, do: Bitwise.bor(f, @flag_normal), else: f end) + + header = + <<@magic::binary, @version::little-unsigned-16, flags::little-unsigned-16, + length(points)::little-unsigned-64>> + + body = + IO.iodata_to_binary( + Enum.map(points, fn p -> + encode_point(p, flags) + end) + ) + + {:ok, header <> body} + end + + def encode(_, _) do + {:error, + Error.new(:invalid_data, + codec: :spatial_binary, + message: "Binary encode expects a PointCloud" + )} + end + + @doc """ + Decodes an EXCP version 1 payload into a point cloud. + + The decoder reads the global color/alpha/normal flags and the declared number + of fixed-shape records described by `encode/2`. Trailing bytes are currently + ignored. Decoded metadata contains `%{"format" => "excp", "version" => 1}`; + attributes and other cloud-level fields use their constructor defaults. + + ## Arguments + + * `data` (`binary()`) — a complete EXCP payload. + * `opts` (`keyword()`) — reserved and currently ignored. + + ## Returns + + * `{:ok, %PointCloud{}}` + * `{:error, %ExCodecs.Error{reason: :invalid_data, + codec: :spatial_binary}}` when the magic/header is invalid or too short, + the version is not 1, or a declared coordinate, RGB/RGBA, or normal field + is truncated. + + ## Raises / exceptions + + Corrupt/truncated payloads covered above are returned, and `opts` is ignored. + This function has a catch-all data clause, so non-binary input also returns + `:invalid_data`; it does not intentionally raise for external payloads. + + ## Examples + + iex> alias ExCodecs.Spatial.{Point, PointCloud} + iex> {:ok, bin} = ExCodecs.Spatial.Codec.Binary.encode(PointCloud.new([Point.new(1.0, 2.0, 3.0)])) + iex> {:ok, %PointCloud{points: [p]}} = ExCodecs.Spatial.Codec.Binary.decode(bin) + iex> p.x + 1.0 + """ + @spec decode(binary(), keyword()) :: {:ok, PointCloud.t()} | {:error, Error.t()} + def decode(data, opts \\ []) + + def decode( + <<@magic::binary, version::little-unsigned-16, flags::little-unsigned-16, + count::little-unsigned-64, rest::binary>>, + _opts + ) do + if version != @version do + {:error, + Error.new(:invalid_data, + codec: :spatial_binary, + message: "Unsupported binary point format version #{version}" + )} + else + with {:ok, points, _} <- decode_points(rest, count, flags) do + meta = Metadata.new(entries: %{"format" => "excp", "version" => version}) + {:ok, PointCloud.new(points, metadata: meta)} + end + end + end + + def decode(_, _) do + {:error, + Error.new(:invalid_data, + codec: :spatial_binary, + message: "Invalid ExCodecs binary point cloud" + )} + end + + @doc """ + Returns an enumerable over points in an EXCP payload. + + ## Arguments + + * `data` (`binary()`) — a complete EXCP payload. + * `opts` (`keyword()`) — reserved and currently ignored. + + ## Returns + + An `Enumerable.t()` that yields decoded `%Point{}` values after the complete + cloud has been materialized. If `decode/2` fails, it yields exactly one + `{:error, %ExCodecs.Error{reason: :invalid_data, + codec: :spatial_binary}}` element. + + ## Raises / exceptions + + Raises `FunctionClauseError` when `data` is not a binary because this public + function is guarded. `opts` is ignored. Binary validation failures are + delayed as the single error element rather than raised. + + ## Examples + + iex> alias ExCodecs.Spatial.{Point, PointCloud} + iex> {:ok, bin} = ExCodecs.Spatial.Codec.Binary.encode(PointCloud.new([Point.new(0, 0, 0)])) + iex> [%Point{x: 0.0, y: 0.0, z: 0.0}] = + ...> ExCodecs.Spatial.Codec.Binary.stream_decode(bin) |> Enum.to_list() + """ + @spec stream_decode(binary(), keyword()) :: Enumerable.t() + def stream_decode(data, opts \\ []) when is_binary(data) do + case decode(data, opts) do + {:ok, %PointCloud{points: points}} -> + Stream.map(points, & &1) + + {:error, error} -> + Stream.resource( + fn -> {:error, error} end, + fn + {:error, e} -> {[{:error, e}], :done} + :done -> {:halt, :done} + end, + fn _ -> :ok end + ) + end + end + + defp encode_point(%Point{} = p, flags) do + xyz = <> + + color = + cond do + Bitwise.band(flags, @flag_alpha) != 0 -> + {r, g, b, a} = normalize_rgba(p.color) + <> + + Bitwise.band(flags, @flag_color) != 0 -> + {r, g, b} = normalize_rgb(p.color) + <> + + true -> + <<>> + end + + normal = + if Bitwise.band(flags, @flag_normal) != 0 do + {nx, ny, nz} = p.normal || {0.0, 0.0, 0.0} + <> + else + <<>> + end + + xyz <> color <> normal + end + + defp normalize_rgb(nil), do: {0, 0, 0} + defp normalize_rgb({r, g, b}), do: {trunc(r), trunc(g), trunc(b)} + defp normalize_rgb({r, g, b, _a}), do: {trunc(r), trunc(g), trunc(b)} + + defp normalize_rgba(nil), do: {0, 0, 0, 255} + defp normalize_rgba({r, g, b}), do: {trunc(r), trunc(g), trunc(b), 255} + defp normalize_rgba({r, g, b, a}), do: {trunc(r), trunc(g), trunc(b), trunc(a)} + + defp decode_points(bin, 0, _flags), do: {:ok, [], bin} + + defp decode_points(bin, count, flags) do + Enum.reduce_while(1..count, {:ok, [], bin}, fn _, {:ok, acc, rest} -> + case decode_point(rest, flags) do + {:ok, point, next} -> {:cont, {:ok, [point | acc], next}} + {:error, _} = err -> {:halt, err} + end + end) + |> case do + {:ok, points, rest} -> {:ok, Enum.reverse(points), rest} + other -> other + end + end + + defp decode_point( + <>, + flags + ) do + with {:ok, color, rest} <- take_color(rest, flags), + {:ok, normal, rest} <- take_normal(rest, flags) do + {:ok, Point.new(x, y, z, color: color, normal: normal), rest} + end + end + + defp decode_point(_, _), + do: + {:error, Error.new(:invalid_data, codec: :spatial_binary, message: "Truncated point record")} + + defp take_color(bin, flags) when Bitwise.band(flags, @flag_alpha) != 0 do + case bin do + <> -> {:ok, {r, g, b, a}, rest} + _ -> {:error, Error.new(:invalid_data, codec: :spatial_binary, message: "Truncated RGBA")} + end + end + + defp take_color(bin, flags) when Bitwise.band(flags, @flag_color) != 0 do + case bin do + <> -> {:ok, {r, g, b}, rest} + _ -> {:error, Error.new(:invalid_data, codec: :spatial_binary, message: "Truncated RGB")} + end + end + + defp take_color(bin, _), do: {:ok, nil, bin} + + defp take_normal(bin, flags) when Bitwise.band(flags, @flag_normal) != 0 do + case bin do + <> -> + {:ok, {nx, ny, nz}, rest} + + _ -> + {:error, Error.new(:invalid_data, codec: :spatial_binary, message: "Truncated normal")} + end + end + + defp take_normal(bin, _), do: {:ok, nil, bin} +end diff --git a/lib/ex_codecs/spatial/codec/gsplat.ex b/lib/ex_codecs/spatial/codec/gsplat.ex new file mode 100644 index 0000000..4d43cee --- /dev/null +++ b/lib/ex_codecs/spatial/codec/gsplat.ex @@ -0,0 +1,311 @@ +defmodule ExCodecs.Spatial.Codec.Gsplat do + @moduledoc """ + Simple little-endian binary format for Gaussian splat clouds. + + ## Layout + + magic: "GSPL" (4 bytes) + version: u16 LE = 1 + flags: u16 LE (bit0 = has SH rest coeffs count in header) + count: u64 LE + sh_rest: u16 LE (number of f_rest floats per Gaussian; 0 if none) + records: count × record + + Each record: + + position: 3 × f32 + color: 3 × f32 (f_dc) + opacity: f32 + scale: 3 × f32 + rotation: 4 × f32 (w, x, y, z) + sh_rest: sh_rest × f32 (optional) + """ + + alias ExCodecs.Error + alias ExCodecs.Spatial.{Gaussian, GaussianCloud, Metadata} + + @magic "GSPL" + @version 1 + + @doc """ + Encodes a Gaussian cloud in the GSPL version 1 binary format. + + The 18-byte header contains `"GSPL"`, version `u16` little-endian, flags + `u16` little-endian, Gaussian count `u64` little-endian, and a shared + spherical-harmonic-rest count `u16` little-endian. Each record contains 14 + little-endian `f32` values: position XYZ, DC color RGB, opacity, scale XYZ, + and quaternion rotation `(w, x, y, z)`, followed by the shared number of + little-endian `f32` SH-rest values. + + The shared SH count is the longest flattened rest coefficient list in the + cloud; shorter lists are padded with zero. The DC coefficient is represented + by `Gaussian.color`. Gaussian metadata and cloud-level metadata are not + stored. + + ## Arguments + + * `data` (`GaussianCloud.t()`) — a cloud of valid `%Gaussian{}` structs. + Each Gaussian has position/color/scale 3-tuples, a rotation 4-tuple, + numeric opacity, and optional SH data shaped as `[dc | rest]` (nested + rest lists are flattened). + * `opts` (`keyword()`) — reserved and currently ignored. + + ## Returns + + * `{:ok, payload}` where `payload` is a GSPL `binary()`. + * `{:error, %ExCodecs.Error{reason: :invalid_data, codec: :gsplat}}` when + `data` is not a `%GaussianCloud{}`. + + ## Raises / exceptions + + A wrong top-level type is returned as `:invalid_data`, and `opts` is ignored. + Manually malformed cloud/Gaussian structs can raise `FunctionClauseError`, + `MatchError`, `ArgumentError`, `ArithmeticError`, or a bitstring construction + exception for invalid SH shapes, tuple shapes, counts, or non-numeric values. + + ## Examples + + iex> alias ExCodecs.Spatial.{Gaussian, GaussianCloud} + iex> cloud = GaussianCloud.new([Gaussian.new({0, 0, 0}, opacity: 0.75)]) + iex> {:ok, <<"GSPL", 1::little-16, _flags::little-16, 1::little-64, + ...> 0::little-16, _record::binary>>} = + ...> ExCodecs.Spatial.Codec.Gsplat.encode(cloud) + iex> true + true + """ + @spec encode(GaussianCloud.t(), keyword()) :: {:ok, binary()} | {:error, Error.t()} + def encode(data, opts \\ []) + + def encode(%GaussianCloud{gaussians: gaussians}, _opts) do + sh_rest = max_sh_rest(gaussians) + flags = if sh_rest > 0, do: 1, else: 0 + + header = + <<@magic::binary, @version::little-unsigned-16, flags::little-unsigned-16, + length(gaussians)::little-unsigned-64, sh_rest::little-unsigned-16>> + + body = + IO.iodata_to_binary(Enum.map(gaussians, fn g -> encode_gaussian(g, sh_rest) end)) + + {:ok, header <> body} + end + + def encode(_, _) do + {:error, + Error.new(:invalid_data, codec: :gsplat, message: "GSPLAT encode expects a GaussianCloud")} + end + + @doc """ + Decodes a GSPL version 1 payload into a Gaussian cloud. + + The decoder reads the header and declared record count described by + `encode/2`. When the shared SH-rest count is nonzero, each decoded + Gaussian's `sh` is `[[r, g, b] | Enum.chunk_every(rest, 3)]`; otherwise it + is `nil`. Trailing bytes and unknown flag bits are currently ignored. + Decoded cloud metadata contains `%{"format" => "gsplat", "version" => 1}`. + + ## Arguments + + * `data` (`binary()`) — a complete GSPL payload. + * `opts` (`keyword()`) — reserved and currently ignored. + + ## Returns + + * `{:ok, %GaussianCloud{}}` + * `{:error, %ExCodecs.Error{reason: :invalid_data, codec: :gsplat}}` when + the magic/header is invalid or too short, the version is not 1, a + declared 14-float record is truncated, or its declared SH-rest values + are truncated. + + ## Raises / exceptions + + The external payload failures above are returned. `opts` is ignored, and + non-binary input is handled by the catch-all clause as `:invalid_data`; this + function does not intentionally raise for external payloads. + + ## Examples + + iex> alias ExCodecs.Spatial.{Gaussian, GaussianCloud} + iex> {:ok, bin} = ExCodecs.Spatial.Codec.Gsplat.encode(GaussianCloud.new([Gaussian.new({1.0, 0.0, 0.0})])) + iex> {:ok, %GaussianCloud{gaussians: [g]}} = ExCodecs.Spatial.Codec.Gsplat.decode(bin) + iex> elem(g.position, 0) + 1.0 + """ + @spec decode(binary(), keyword()) :: {:ok, GaussianCloud.t()} | {:error, Error.t()} + def decode(data, opts \\ []) + + def decode( + <<@magic::binary, version::little-unsigned-16, _flags::little-unsigned-16, + count::little-unsigned-64, sh_rest::little-unsigned-16, rest::binary>>, + _opts + ) do + if version != @version do + {:error, + Error.new(:invalid_data, + codec: :gsplat, + message: "Unsupported GSPLAT version #{version}" + )} + else + with {:ok, gaussians, _} <- decode_gaussians(rest, count, sh_rest) do + meta = Metadata.new(entries: %{"format" => "gsplat", "version" => version}) + {:ok, GaussianCloud.new(gaussians, metadata: meta)} + end + end + end + + def decode(_, _) do + {:error, Error.new(:invalid_data, codec: :gsplat, message: "Invalid GSPLAT binary")} + end + + @doc """ + Returns an enumerable over Gaussians in a GSPL payload. + + ## Arguments + + * `data` (`binary()`) — a complete GSPL payload. + * `opts` (`keyword()`) — reserved and currently ignored. + + ## Returns + + An `Enumerable.t()` that yields decoded `%Gaussian{}` structs after the + complete cloud has been materialized. If `decode/2` fails, it yields exactly + one `{:error, %ExCodecs.Error{reason: :invalid_data, codec: :gsplat}}` + element. + + ## Raises / exceptions + + Raises `FunctionClauseError` when `data` is not a binary because this public + function is guarded. `opts` is ignored. Binary validation failures are + delayed as the single error element rather than raised. + + ## Examples + + iex> alias ExCodecs.Spatial.{Gaussian, GaussianCloud} + iex> {:ok, bin} = ExCodecs.Spatial.Codec.Gsplat.encode(GaussianCloud.new([Gaussian.new({0, 0, 0})])) + iex> [%Gaussian{opacity: 1.0}] = + ...> ExCodecs.Spatial.Codec.Gsplat.stream_decode(bin) |> Enum.to_list() + """ + @spec stream_decode(binary(), keyword()) :: Enumerable.t() + def stream_decode(data, opts \\ []) when is_binary(data) do + case decode(data, opts) do + {:ok, %GaussianCloud{gaussians: gs}} -> + Stream.map(gs, & &1) + + {:error, error} -> + Stream.resource( + fn -> {:error, error} end, + fn + {:error, e} -> {[{:error, e}], :done} + :done -> {:halt, :done} + end, + fn _ -> :ok end + ) + end + end + + defp max_sh_rest(gaussians) do + gaussians + |> Enum.map(fn + %{sh: nil} -> 0 + %{sh: [_dc | rest]} -> length(List.flatten(rest)) + %{sh: other} when is_list(other) -> max(length(List.flatten(other)) - 3, 0) + end) + |> Enum.max(fn -> 0 end) + end + + defp encode_gaussian(%Gaussian{} = g, sh_rest) do + {x, y, z} = g.position + {r, gc, b} = g.color + {sx, sy, sz} = g.scale + {rw, rx, ry, rz} = g.rotation + + base = + <> + + rest = + g.sh + |> sh_rest_values() + |> then(fn vals -> + vals + |> Stream.concat(Stream.cycle([0.0])) + |> Enum.take(sh_rest) + end) + |> Enum.map(fn v -> <> end) + |> IO.iodata_to_binary() + + base <> rest + end + + defp sh_rest_values(nil), do: [] + defp sh_rest_values([_dc | rest]), do: List.flatten(rest) + defp sh_rest_values(list) when is_list(list), do: list |> List.flatten() |> Enum.drop(3) + + defp decode_gaussians(bin, 0, _sh_rest), do: {:ok, [], bin} + + defp decode_gaussians(bin, count, sh_rest) do + Enum.reduce_while(1..count, {:ok, [], bin}, fn _, {:ok, acc, rest} -> + case decode_gaussian(rest, sh_rest) do + {:ok, g, next} -> {:cont, {:ok, [g | acc], next}} + {:error, _} = err -> {:halt, err} + end + end) + |> case do + {:ok, gs, rest} -> {:ok, Enum.reverse(gs), rest} + other -> other + end + end + + defp decode_gaussian( + <>, + sh_rest + ) do + case take_floats(rest, sh_rest) do + {:ok, sh_vals, next} -> + sh = + if sh_rest == 0 do + nil + else + [[r, gc, b] | Enum.chunk_every(sh_vals, 3)] + end + + g = + Gaussian.new({x, y, z}, + color: {r, gc, b}, + opacity: opacity, + scale: {sx, sy, sz}, + rotation: {rw, rx, ry, rz}, + sh: sh + ) + + {:ok, g, next} + + {:error, _} = err -> + err + end + end + + defp decode_gaussian(_, _) do + {:error, Error.new(:invalid_data, codec: :gsplat, message: "Truncated Gaussian record")} + end + + defp take_floats(bin, 0), do: {:ok, [], bin} + + defp take_floats(bin, n) do + Enum.reduce_while(1..n, {:ok, [], bin}, fn _, {:ok, acc, rest} -> + case rest do + <> -> {:cont, {:ok, [v | acc], next}} + _ -> {:halt, {:error, Error.new(:invalid_data, codec: :gsplat, message: "Truncated SH")}} + end + end) + |> case do + {:ok, vals, rest} -> {:ok, Enum.reverse(vals), rest} + other -> other + end + end +end diff --git a/lib/ex_codecs/spatial/codec/ply.ex b/lib/ex_codecs/spatial/codec/ply.ex new file mode 100644 index 0000000..d72c92f --- /dev/null +++ b/lib/ex_codecs/spatial/codec/ply.ex @@ -0,0 +1,985 @@ +defmodule ExCodecs.Spatial.Codec.PLY do + @moduledoc """ + ASCII and binary PLY for point clouds and Gaussian splats. + + ## Options + + * `:format` / `:ply_format` — wire encoding: `:ascii` (default), + `:binary` / `:binary_le`, `:binary_be` (not Spatial's `format: :ply`) + * `:comments` — header comments + * `:as` — decode as `:auto` | `:point_cloud` | `:gaussian_cloud` + * `:source` — for `stream_decode/2`: `:auto` | `:file` | `:binary` + + Public functions: `encode/2`, `decode/2`, `stream_decode/2`. + """ + + alias ExCodecs.Error + alias ExCodecs.Spatial.{Gaussian, GaussianCloud, Metadata, Point, PointCloud} + + @typedoc """ + Wire encoding used for a PLY payload. + + `:ascii` writes textual scalar values. `:binary_le` and `:binary_be` write + packed scalar values in little- and big-endian order, respectively. + `:binary` is an encoding-option shorthand for `:binary_le`; decoded headers + report the explicit endian atom. + + For example, `encode(cloud, ply_format: :binary_be)` emits a + `format binary_big_endian 1.0` header. + """ + @type ply_format :: :ascii | :binary | :binary_le | :binary_be + + @doc """ + Encodes a point cloud or Gaussian cloud as a PLY 1.0 payload. + + Point vertices always contain `x`, `y`, and `z` as `float`. If any point has + color or a normal, the corresponding `uchar` RGB/RGBA or `float` normal + properties are emitted for every point; missing values are zero-filled + (alpha defaults to 255). The union of point attribute keys is emitted as + sorted `float` properties, with absent attributes set to `0.0`. + + Gaussian vertices contain position, `f_dc_0..2`, opacity, scale, and + quaternion `rot_0..3` (`w, x, y, z`) as `float`. If spherical-harmonic + coefficients are present, flattened `f_rest_N` properties are appended and + shorter rows are zero-filled. + + ## Arguments + + * `data` (`PointCloud.t() | GaussianCloud.t()`) — a cloud containing valid + `%Point{}` or `%Gaussian{}` structs. + * `opts` (`keyword()`) — supported options: + * `:ply_format` — preferred wire format: `:ascii` (default), `:binary` + (little-endian), `:binary_le`, or `:binary_be`. + * `:format` — legacy alias for `:ply_format` when calling this codec + directly. `:ply_format` takes precedence. + * `:comments` — enumerable of strings for PLY `comment` header lines; + defaults to `cloud.metadata.comments`. + + `:little` and `:big` are also normalized to little-/big-endian output. + Any unrecognized wire-format value currently falls back to `:ascii`. + + ## Returns + + * `{:ok, payload}` where `payload` is an ASCII or binary PLY `binary()`. + * `{:error, %ExCodecs.Error{reason: :invalid_data, codec: :ply}}` when + `data` is not a supported cloud or any exception occurs while deriving + properties, building the header, or encoding rows. + + ## Raises / exceptions + + The cloud clauses rescue encoding exceptions and return `:invalid_data`, + including invalid keyword options, malformed nested structs, non-string + comments, invalid scalar ranges/types, and bad attribute shapes. Unsupported + top-level data is also returned as `:invalid_data`; this function does not + intentionally raise. + + ## Examples + + iex> alias ExCodecs.Spatial.{Point, PointCloud} + iex> cloud = PointCloud.new([Point.new(0, 1, 2, color: {255, 64, 0})]) + iex> {:ok, ply} = ExCodecs.Spatial.Codec.PLY.encode(cloud, ply_format: :ascii) + iex> String.contains?(ply, "property uchar red") + true + """ + @spec encode(PointCloud.t() | GaussianCloud.t(), keyword()) :: + {:ok, binary()} | {:error, Error.t()} + def encode(data, opts \\ []) + + def encode(%PointCloud{} = cloud, opts) do + format = normalize_format(ply_format_opt(opts)) + comments = Keyword.get(opts, :comments, cloud.metadata.comments) + + with {:ok, props} <- point_properties(cloud.points) do + body = encode_points(cloud.points, props, format) + header = build_header(format, length(cloud.points), props, comments) + {:ok, header <> body} + end + rescue + e -> + {:error, + Error.new(:invalid_data, + codec: :ply, + message: "PLY encode failed: #{Exception.message(e)}" + )} + end + + def encode(%GaussianCloud{} = cloud, opts) do + format = normalize_format(ply_format_opt(opts)) + comments = Keyword.get(opts, :comments, cloud.metadata.comments) + props = gaussian_properties(cloud.gaussians) + body = encode_gaussians(cloud.gaussians, props, format) + header = build_header(format, length(cloud.gaussians), props, comments) + {:ok, header <> body} + rescue + e -> + {:error, + Error.new(:invalid_data, + codec: :ply, + message: "PLY encode failed: #{Exception.message(e)}" + )} + end + + def encode(_data, _opts) do + {:error, + Error.new(:invalid_data, + codec: :ply, + message: "PLY encode expects a PointCloud or GaussianCloud" + )} + end + + @doc """ + Decodes a complete PLY 1.0 payload into a point or Gaussian cloud. + + ASCII and binary little-/big-endian scalar vertex properties are supported: + `char`/`int8`, `uchar`/`uint8`, `short`/`int16`, `ushort`/`uint16`, + `int`/`int32`, `uint`/`uint32`, `float`/`float32`, and + `double`/`float64`. List properties and non-vertex payloads are unsupported. + + Point decoding recognizes `x/y/z`, RGB or RGBA, and `nx/ny/nz`; all other + scalar properties become string-keyed point attributes. Gaussian decoding + interprets `f_dc_*`, opacity, scale, rotation, and ordered `f_rest_*` + properties. Header comments and the detected PLY format are retained in + cloud metadata. + + ## Arguments + + * `data` (`binary()`) — the complete PLY header and vertex body. + * `opts` (`keyword()`) — `:as` may be `:auto` (default), `:point_cloud`, or + `:gaussian_cloud`. `:auto` chooses Gaussian output when the property set + contains `f_dc_0`, `scale_0`, or `rot_0`; otherwise it chooses points. + The wire format is always read from the header. + + ## Returns + + * `{:ok, %PointCloud{}}` or `{:ok, %GaussianCloud{}}`, including metadata. + * `{:error, %ExCodecs.Error{reason: :invalid_data, codec: :ply}}` for + non-binary input, missing/invalid magic or format/header lines, missing + vertex elements, invalid counts/properties, unsupported list/property + types, too few ASCII rows, or a short binary body. + + ## Raises / exceptions + + The listed structural failures are returned. `Keyword.get/3` raises + `FunctionClauseError` when `opts` is not a proper keyword list. An unsupported + `:as` value raises `CaseClauseError`. Malformed row contents may also raise + (`KeyError`, `ArgumentError`, `FunctionClauseError`, or a bitstring match + exception), because scalar/required-property validation is not fully wrapped; + invalid ASCII scalar tokens are currently coerced to `0.0`. + + ## Examples + + iex> alias ExCodecs.Spatial.{Point, PointCloud} + iex> cloud = PointCloud.new([Point.new(1.0, 0.0, 0.0, normal: {0.0, 0.0, 1.0})]) + iex> {:ok, ply} = ExCodecs.Spatial.Codec.PLY.encode(cloud, ply_format: :binary_le) + iex> {:ok, %PointCloud{points: [point]}} = ExCodecs.Spatial.Codec.PLY.decode(ply) + iex> point.normal + {0.0, 0.0, 1.0} + """ + @spec decode(binary(), keyword()) :: + {:ok, PointCloud.t() | GaussianCloud.t()} | {:error, Error.t()} + def decode(data, opts \\ []) + + def decode(data, opts) when is_binary(data) do + as = Keyword.get(opts, :as, :auto) + + with {:ok, header, body} <- split_header(data), + {:ok, parsed} <- parse_header(header) do + case resolve_as(as, parsed.properties) do + :point_cloud -> + with {:ok, points} <- decode_vertices(body, parsed) do + meta = + Metadata.new( + comments: parsed.comments, + entries: %{"ply_format" => to_string(parsed.format)} + ) + + {:ok, PointCloud.new(points, metadata: meta)} + end + + :gaussian_cloud -> + with {:ok, gaussians} <- decode_gaussians(body, parsed) do + meta = + Metadata.new( + comments: parsed.comments, + entries: %{"ply_format" => to_string(parsed.format)} + ) + + {:ok, GaussianCloud.new(gaussians, metadata: meta)} + end + end + end + end + + def decode(_data, _opts) do + {:error, Error.new(:invalid_data, codec: :ply, message: "PLY data must be a binary")} + end + + @doc """ + Returns an enumerable over vertices from a PLY path or binary. + + Both modes currently read and decode the entire payload before yielding + elements; this is not incremental PLY parsing. + + ## Arguments + + * `source` (`Path.t() | binary()`) — a path or complete PLY payload. + * `opts` (`keyword()`) — `:source` may be `:auto` (default), `:file`, or + `:binary`. Auto mode treats a short path-like binary as a file only when + it names a regular file; otherwise it is payload data. `:as` has the same + meaning as in `decode/2`. + + ## Returns + + An `Enumerable.t()` yielding `%Point{}` or `%Gaussian{}`. Decode failures, + including `reason: :invalid_data`, are represented by exactly one + `{:error, %ExCodecs.Error{}}` element. A selected path that cannot be read + yields one error with `reason: :io_error` and the file reason in `details`. + + ## Raises / exceptions + + File and normal decode failures become stream elements. A non-binary + `source` raises `FunctionClauseError`. Keyword access raises + `FunctionClauseError` for invalid `opts`; unsupported `:source` values raise + `CaseClauseError`. Exceptions described by `decode/2` may occur while the + stream is initialized or enumerated. + + ## Examples + + iex> alias ExCodecs.Spatial.{Point, PointCloud} + iex> {:ok, ply} = ExCodecs.Spatial.Codec.PLY.encode(PointCloud.new([Point.new(0, 0, 0)])) + iex> [%Point{x: 0.0}] = ExCodecs.Spatial.Codec.PLY.stream_decode(ply) |> Enum.to_list() + """ + @spec stream_decode(binary() | Path.t(), keyword()) :: Enumerable.t() + def stream_decode(source, opts \\ []) + + def stream_decode(data, opts) when is_binary(data) do + case resolve_ply_source(data, opts) do + {:ok, :binary, bin} -> + case decode_to_list(bin, opts) do + {:ok, items} -> + Stream.map(items, & &1) + + {:error, error} -> + Stream.resource(fn -> {:error, error} end, &error_stream/1, fn _ -> :ok end) + end + + {:ok, :file, path} -> + Stream.resource( + fn -> open_ply_file(path, opts) end, + &next_ply_item/1, + &close_ply_file/1 + ) + end + end + + defp resolve_ply_source(bin, opts) do + case Keyword.get(opts, :source, :auto) do + :binary -> + {:ok, :binary, bin} + + :file -> + {:ok, :file, bin} + + :auto -> + if path_like_ply?(bin) and File.regular?(bin) do + {:ok, :file, bin} + else + {:ok, :binary, bin} + end + end + end + + defp path_like_ply?(bin) do + byte_size(bin) < 4096 and not ply_binary?(bin) and + (String.contains?(bin, "/") or String.contains?(bin, "\\") or + String.ends_with?(bin, [".ply", ".PLY"])) + end + + @doc false + def decode_header_and_body(data) when is_binary(data) do + with {:ok, header, body} <- split_header(data), + {:ok, parsed} <- parse_header(header) do + {:ok, parsed, body} + end + end + + # --- Header --------------------------------------------------------------- + + defp ply_binary?(<>) do + String.starts_with?(data, "ply") + end + + defp ply_binary?(_), do: false + + defp split_header(data) do + case :binary.match(data, "end_header") do + {pos, len} -> + # skip end_header and following newline(s) + rest = binary_part(data, pos + len, byte_size(data) - pos - len) + body = strip_leading_newlines(rest) + header = binary_part(data, 0, pos + len) + {:ok, header, body} + + :nomatch -> + {:error, Error.new(:invalid_data, codec: :ply, message: "PLY header missing end_header")} + end + end + + defp strip_leading_newlines(<<"\r\n", rest::binary>>), do: rest + defp strip_leading_newlines(<<"\n", rest::binary>>), do: rest + defp strip_leading_newlines(<<"\r", rest::binary>>), do: rest + defp strip_leading_newlines(bin), do: bin + + defp parse_header(header) do + lines = + header + |> String.split(~r/\r\n|\n|\r/, trim: true) + |> Enum.map(&String.trim/1) + + with :ok <- validate_magic(lines), + {:ok, format} <- find_format(lines), + {:ok, count, properties} <- find_vertex_element(lines) do + comments = + lines + |> Enum.filter(&String.starts_with?(&1, "comment ")) + |> Enum.map(&String.trim_leading(&1, "comment ")) + + {:ok, + %{ + format: format, + count: count, + properties: properties, + comments: comments + }} + end + end + + defp validate_magic(["ply" | _]), do: :ok + + defp validate_magic(_) do + {:error, Error.new(:invalid_data, codec: :ply, message: "PLY data must start with 'ply'")} + end + + defp find_format(lines) do + case Enum.find(lines, &String.starts_with?(&1, "format ")) do + "format ascii 1.0" <> _ -> + {:ok, :ascii} + + "format binary_little_endian 1.0" <> _ -> + {:ok, :binary_le} + + "format binary_big_endian 1.0" <> _ -> + {:ok, :binary_be} + + other when is_binary(other) -> + {:error, Error.new(:invalid_data, codec: :ply, message: "Unsupported PLY format: #{other}")} + + nil -> + {:error, Error.new(:invalid_data, codec: :ply, message: "PLY format line missing")} + end + end + + defp find_vertex_element(lines) do + case Enum.find_index(lines, &String.starts_with?(&1, "element vertex ")) do + nil -> + {:error, Error.new(:invalid_data, codec: :ply, message: "No vertex element in PLY")} + + idx -> + line = Enum.at(lines, idx) + + with {:ok, count} <- parse_vertex_count(line) do + props = + lines + |> Enum.drop(idx + 1) + |> Enum.take_while(&String.starts_with?(&1, "property ")) + |> Enum.map(&parse_property/1) + + if Enum.any?(props, &match?({:error, _}, &1)) do + {:error, Error.new(:invalid_data, codec: :ply, message: "Invalid PLY property")} + else + {:ok, count, props} + end + end + end + end + + defp parse_vertex_count(line) do + case String.split(line) do + ["element", "vertex", count_str] -> + case Integer.parse(count_str) do + {count, ""} when count >= 0 -> + {:ok, count} + + _ -> + {:error, + Error.new(:invalid_data, codec: :ply, message: "Invalid vertex count in PLY header")} + end + + _ -> + {:error, + Error.new(:invalid_data, codec: :ply, message: "Malformed element vertex line in PLY")} + end + end + + defp parse_property("property list " <> _), + do: {:error, :list_properties_unsupported} + + defp parse_property("property " <> rest) do + case String.split(rest) do + [type, name] -> + case property_type(type) do + {:ok, t} -> %{type: t, name: name} + :error -> {:error, :unknown_property_type} + end + + _ -> + {:error, :bad_property} + end + end + + defp property_type("char"), do: {:ok, :char} + defp property_type("uchar"), do: {:ok, :uchar} + defp property_type("short"), do: {:ok, :short} + defp property_type("ushort"), do: {:ok, :ushort} + defp property_type("int"), do: {:ok, :int} + defp property_type("uint"), do: {:ok, :uint} + defp property_type("float"), do: {:ok, :float} + defp property_type("double"), do: {:ok, :double} + defp property_type("int8"), do: {:ok, :char} + defp property_type("uint8"), do: {:ok, :uchar} + defp property_type("int16"), do: {:ok, :short} + defp property_type("uint16"), do: {:ok, :ushort} + defp property_type("int32"), do: {:ok, :int} + defp property_type("uint32"), do: {:ok, :uint} + defp property_type("float32"), do: {:ok, :float} + defp property_type("float64"), do: {:ok, :double} + defp property_type(_), do: :error + + # --- Encode points -------------------------------------------------------- + + defp point_properties(points) do + has_color? = Enum.any?(points, &Point.colored?/1) + has_alpha? = Enum.any?(points, fn p -> match?({_, _, _, _}, p.color) end) + has_normal? = Enum.any?(points, &Point.has_normal?/1) + + attr_names = + points + |> Enum.flat_map(fn p -> Map.keys(p.attributes) end) + |> Enum.uniq() + |> Enum.map(&to_string/1) + |> Enum.sort() + + base = [ + %{type: :float, name: "x"}, + %{type: :float, name: "y"}, + %{type: :float, name: "z"} + ] + + color = + cond do + has_alpha? -> + [ + %{type: :uchar, name: "red"}, + %{type: :uchar, name: "green"}, + %{type: :uchar, name: "blue"}, + %{type: :uchar, name: "alpha"} + ] + + has_color? -> + [ + %{type: :uchar, name: "red"}, + %{type: :uchar, name: "green"}, + %{type: :uchar, name: "blue"} + ] + + true -> + [] + end + + normal = + if has_normal? do + [ + %{type: :float, name: "nx"}, + %{type: :float, name: "ny"}, + %{type: :float, name: "nz"} + ] + else + [] + end + + attrs = Enum.map(attr_names, fn name -> %{type: :float, name: name} end) + {:ok, base ++ color ++ normal ++ attrs} + end + + defp gaussian_properties(gaussians) do + has_sh? = Enum.any?(gaussians, &(&1.sh != nil)) + + base = [ + %{type: :float, name: "x"}, + %{type: :float, name: "y"}, + %{type: :float, name: "z"}, + %{type: :float, name: "f_dc_0"}, + %{type: :float, name: "f_dc_1"}, + %{type: :float, name: "f_dc_2"}, + %{type: :float, name: "opacity"}, + %{type: :float, name: "scale_0"}, + %{type: :float, name: "scale_1"}, + %{type: :float, name: "scale_2"}, + %{type: :float, name: "rot_0"}, + %{type: :float, name: "rot_1"}, + %{type: :float, name: "rot_2"}, + %{type: :float, name: "rot_3"} + ] + + sh_props = + if has_sh? do + max_rest = + gaussians + |> Enum.map(fn g -> + case g.sh do + nil -> 0 + [_dc | rest] -> length(List.flatten(rest)) + _ -> 0 + end + end) + |> Enum.max(fn -> 0 end) + + for i <- 0..(max_rest - 1)//1, max_rest > 0 do + %{type: :float, name: "f_rest_#{i}"} + end + else + [] + end + + base ++ sh_props + end + + defp build_header(format, count, props, comments) do + format_line = + case format do + :ascii -> "format ascii 1.0" + :binary_le -> "format binary_little_endian 1.0" + :binary_be -> "format binary_big_endian 1.0" + end + + comment_lines = Enum.map(comments, fn c -> "comment #{c}" end) + + prop_lines = + Enum.map(props, fn %{type: type, name: name} -> + "property #{type_name(type)} #{name}" + end) + + Enum.join( + ["ply", format_line] ++ + comment_lines ++ + ["element vertex #{count}"] ++ + prop_lines ++ + ["end_header", ""], + "\n" + ) + end + + defp type_name(:char), do: "char" + defp type_name(:uchar), do: "uchar" + defp type_name(:short), do: "short" + defp type_name(:ushort), do: "ushort" + defp type_name(:int), do: "int" + defp type_name(:uint), do: "uint" + defp type_name(:float), do: "float" + defp type_name(:double), do: "double" + + defp encode_points(points, props, :ascii) do + points + |> Enum.map_join("\n", fn point -> + point + |> point_values(props) + |> Enum.map_join(" ", &ascii_value/1) + end) + |> then(&(&1 <> "\n")) + end + + defp encode_points(points, props, endian) when endian in [:binary_le, :binary_be] do + IO.iodata_to_binary( + Enum.map(points, fn point -> + point + |> point_values(props) + |> Enum.zip(props) + |> Enum.map(fn {value, %{type: type}} -> pack(type, value, endian) end) + end) + ) + end + + defp point_values(%Point{} = p, props) do + {nx, ny, nz} = p.normal || {0.0, 0.0, 0.0} + + known = %{ + "x" => p.x, + "y" => p.y, + "z" => p.z, + "nx" => nx, + "ny" => ny, + "nz" => nz, + "red" => color_channel(p.color, 0), + "green" => color_channel(p.color, 1), + "blue" => color_channel(p.color, 2), + "alpha" => color_channel(p.color, 3, 255) + } + + Enum.map(props, fn %{name: name} -> attribute_value(known, p.attributes, name) end) + end + + defp attribute_value(known, attributes, name) do + cond do + Map.has_key?(known, name) -> Map.fetch!(known, name) + Map.has_key?(attributes, name) -> Map.fetch!(attributes, name) + true -> attribute_atom_value(attributes, name) + end + end + + defp attribute_atom_value(attributes, name) do + atom = String.to_existing_atom(name) + Map.get(attributes, atom, 0.0) + rescue + ArgumentError -> 0.0 + end + + defp color_channel(color, idx, default \\ 0) + defp color_channel(nil, _idx, default), do: default + + defp color_channel(color, idx, default) do + if idx < tuple_size(color), do: elem(color, idx), else: default + end + + defp encode_gaussians(gaussians, props, :ascii) do + gaussians + |> Enum.map_join("\n", fn g -> + g + |> gaussian_values(props) + |> Enum.map_join(" ", &ascii_value/1) + end) + |> then(&(&1 <> "\n")) + end + + defp encode_gaussians(gaussians, props, endian) when endian in [:binary_le, :binary_be] do + IO.iodata_to_binary( + Enum.map(gaussians, fn g -> + g + |> gaussian_values(props) + |> Enum.zip(props) + |> Enum.map(fn {value, %{type: type}} -> pack(type, value, endian) end) + end) + ) + end + + defp gaussian_values(%Gaussian{} = g, props) do + {x, y, z} = g.position + {r, gc, b} = g.color + {sx, sy, sz} = g.scale + {rw, rx, ry, rz} = g.rotation + rest = sh_rest_flat(g.sh) + + known = %{ + "x" => x, + "y" => y, + "z" => z, + "f_dc_0" => r, + "f_dc_1" => gc, + "f_dc_2" => b, + "opacity" => g.opacity, + "scale_0" => sx, + "scale_1" => sy, + "scale_2" => sz, + "rot_0" => rw, + "rot_1" => rx, + "rot_2" => ry, + "rot_3" => rz + } + + Enum.map(props, fn %{name: name} -> + case Map.fetch(known, name) do + {:ok, value} -> value + :error -> rest_coeff(name, rest) + end + end) + end + + defp rest_coeff("f_rest_" <> idx, rest), do: Enum.at(rest, String.to_integer(idx), 0.0) + defp rest_coeff(_, _), do: 0.0 + + defp sh_rest_flat(nil), do: [] + defp sh_rest_flat([_dc | rest]), do: List.flatten(rest) + defp sh_rest_flat(other) when is_list(other), do: List.flatten(other) + + defp ascii_value(v) when is_integer(v), do: Integer.to_string(v) + defp ascii_value(v) when is_float(v), do: :erlang.float_to_binary(v, [:short]) + + defp pack(:uchar, v, _), do: <> + defp pack(:char, v, _), do: <> + defp pack(:ushort, v, :binary_le), do: <> + defp pack(:ushort, v, :binary_be), do: <> + defp pack(:short, v, :binary_le), do: <> + defp pack(:short, v, :binary_be), do: <> + defp pack(:uint, v, :binary_le), do: <> + defp pack(:uint, v, :binary_be), do: <> + defp pack(:int, v, :binary_le), do: <> + defp pack(:int, v, :binary_be), do: <> + defp pack(:float, v, :binary_le), do: <> + defp pack(:float, v, :binary_be), do: <> + defp pack(:double, v, :binary_le), do: <> + defp pack(:double, v, :binary_be), do: <> + + # --- Decode --------------------------------------------------------------- + + defp resolve_as(:point_cloud, _), do: :point_cloud + defp resolve_as(:gaussian_cloud, _), do: :gaussian_cloud + + defp resolve_as(:auto, props) do + names = MapSet.new(Enum.map(props, & &1.name)) + + if MapSet.member?(names, "f_dc_0") or MapSet.member?(names, "scale_0") or + MapSet.member?(names, "rot_0") do + :gaussian_cloud + else + :point_cloud + end + end + + defp decode_vertices(body, %{format: :ascii, count: count, properties: props}) do + lines = + body + |> String.split(~r/\r\n|\n|\r/, trim: true) + |> Enum.take(count) + + if length(lines) < count do + {:error, + Error.new(:invalid_data, + codec: :ply, + message: "Expected #{count} vertices, got #{length(lines)}" + )} + else + points = + Enum.map(lines, fn line -> + values = String.split(line) |> Enum.map(&parse_ascii_number/1) + values_to_point(values, props) + end) + + {:ok, points} + end + end + + defp decode_vertices(body, %{format: endian, count: count, properties: props}) + when endian in [:binary_le, :binary_be] do + stride = Enum.reduce(props, 0, fn p, acc -> acc + type_size(p.type) end) + expected = stride * count + + if byte_size(body) < expected do + {:error, + Error.new(:invalid_data, + codec: :ply, + message: "Binary PLY body too short" + )} + else + {points, _} = + Enum.map_reduce(1..count, body, fn _, rest -> + {values, next} = unpack_row(rest, props, endian) + {values_to_point(values, props), next} + end) + + {:ok, points} + end + end + + defp decode_gaussians(body, parsed) do + with {:ok, points} <- decode_vertices(body, parsed) do + gaussians = + Enum.map(points, fn %Point{} = p -> + attrs = stringify_attrs(p.attributes) + + Gaussian.new({p.x, p.y, p.z}, + color: { + Map.get(attrs, "f_dc_0", 0.5), + Map.get(attrs, "f_dc_1", 0.5), + Map.get(attrs, "f_dc_2", 0.5) + }, + opacity: Map.get(attrs, "opacity", 1.0), + scale: { + Map.get(attrs, "scale_0", 1.0), + Map.get(attrs, "scale_1", 1.0), + Map.get(attrs, "scale_2", 1.0) + }, + rotation: { + Map.get(attrs, "rot_0", 1.0), + Map.get(attrs, "rot_1", 0.0), + Map.get(attrs, "rot_2", 0.0), + Map.get(attrs, "rot_3", 0.0) + }, + sh: extract_sh(attrs), + metadata: attrs + ) + end) + + {:ok, gaussians} + end + end + + defp stringify_attrs(attrs) do + Map.new(attrs, fn + {k, v} when is_atom(k) -> {Atom.to_string(k), v} + {k, v} when is_binary(k) -> {k, v} + end) + end + + defp extract_sh(attrs) do + rest_keys = + attrs + |> Map.keys() + |> Enum.filter(&String.starts_with?(&1, "f_rest_")) + |> Enum.sort_by(fn "f_rest_" <> i -> String.to_integer(i) end) + + if rest_keys == [] do + nil + else + dc = [ + Map.get(attrs, "f_dc_0", 0.0), + Map.get(attrs, "f_dc_1", 0.0), + Map.get(attrs, "f_dc_2", 0.0) + ] + + rest = Enum.map(rest_keys, &Map.get(attrs, &1, 0.0)) + [dc | Enum.chunk_every(rest, 3)] + end + end + + defp values_to_point(values, props) do + paired = Enum.zip(props, values) |> Map.new(fn {%{name: n}, v} -> {n, v} end) + + color = + cond do + Map.has_key?(paired, "alpha") and Map.has_key?(paired, "red") -> + {trunc(paired["red"]), trunc(paired["green"]), trunc(paired["blue"]), + trunc(paired["alpha"])} + + Map.has_key?(paired, "red") -> + {trunc(paired["red"]), trunc(paired["green"]), trunc(paired["blue"])} + + true -> + nil + end + + normal = + if Map.has_key?(paired, "nx") do + {paired["nx"] * 1.0, paired["ny"] * 1.0, paired["nz"] * 1.0} + else + nil + end + + known = ["x", "y", "z", "red", "green", "blue", "alpha", "nx", "ny", "nz"] + + attributes = + paired + |> Enum.reject(fn {key, _value} -> key in known end) + |> Map.new() + + Point.new(paired["x"] || 0.0, paired["y"] || 0.0, paired["z"] || 0.0, + color: color, + normal: normal, + attributes: attributes + ) + end + + defp parse_ascii_number(str) do + case Integer.parse(str) do + {i, ""} -> + i + + _ -> + case Float.parse(str) do + {f, _} -> f + :error -> 0.0 + end + end + end + + defp unpack_row(bin, props, endian) do + Enum.map_reduce(props, bin, fn %{type: type}, rest -> + unpack(type, rest, endian) + end) + end + + defp unpack(:uchar, <>, _), do: {v, rest} + defp unpack(:char, <>, _), do: {v, rest} + + defp unpack(:ushort, <>, :binary_le), + do: {v, rest} + + defp unpack(:ushort, <>, :binary_be), do: {v, rest} + defp unpack(:short, <>, :binary_le), do: {v, rest} + defp unpack(:short, <>, :binary_be), do: {v, rest} + defp unpack(:uint, <>, :binary_le), do: {v, rest} + defp unpack(:uint, <>, :binary_be), do: {v, rest} + defp unpack(:int, <>, :binary_le), do: {v, rest} + defp unpack(:int, <>, :binary_be), do: {v, rest} + defp unpack(:float, <>, :binary_le), do: {v, rest} + defp unpack(:float, <>, :binary_be), do: {v, rest} + defp unpack(:double, <>, :binary_le), do: {v, rest} + defp unpack(:double, <>, :binary_be), do: {v, rest} + + defp type_size(:char), do: 1 + defp type_size(:uchar), do: 1 + defp type_size(:short), do: 2 + defp type_size(:ushort), do: 2 + defp type_size(:int), do: 4 + defp type_size(:uint), do: 4 + defp type_size(:float), do: 4 + defp type_size(:double), do: 8 + + defp ply_format_opt(opts) do + Keyword.get(opts, :ply_format) || Keyword.get(opts, :format, :ascii) + end + + defp normalize_format(:ascii), do: :ascii + defp normalize_format(:binary), do: :binary_le + defp normalize_format(:binary_le), do: :binary_le + defp normalize_format(:binary_be), do: :binary_be + defp normalize_format(:little), do: :binary_le + defp normalize_format(:big), do: :binary_be + defp normalize_format(_), do: :ascii + + # --- Streaming helpers ---------------------------------------------------- + + defp decode_to_list(data, opts) when is_binary(data) do + case decode(data, opts) do + {:ok, %PointCloud{points: points}} -> {:ok, points} + {:ok, %GaussianCloud{gaussians: gs}} -> {:ok, gs} + {:error, _} = err -> err + end + end + + defp open_ply_file(path, opts) do + case File.read(path) do + {:ok, data} -> + case decode_to_list(data, opts) do + {:ok, items} -> {:ok, items} + {:error, error} -> {:error, error} + end + + {:error, reason} -> + {:error, + Error.new(:io_error, + codec: :ply, + message: "Failed to read PLY file: #{inspect(reason)}", + details: reason + )} + end + end + + defp next_ply_item({:ok, [item | rest]}), do: {[item], {:ok, rest}} + defp next_ply_item({:ok, []}), do: {:halt, :done} + defp next_ply_item({:error, error}), do: {[{:error, error}], :done} + defp next_ply_item(:done), do: {:halt, :done} + + defp close_ply_file(_), do: :ok + + defp error_stream({:error, error}), do: {[{:error, error}], :done} + defp error_stream(:done), do: {:halt, :done} +end diff --git a/lib/ex_codecs/spatial/gaussian.ex b/lib/ex_codecs/spatial/gaussian.ex new file mode 100644 index 0000000..6e4e183 --- /dev/null +++ b/lib/ex_codecs/spatial/gaussian.ex @@ -0,0 +1,140 @@ +defmodule ExCodecs.Spatial.Gaussian do + @moduledoc """ + A single 3D Gaussian splat used for data interchange, not rendering. + + ## Fields + + * `:position` — `{float(), float(), float()}` center in application-defined + Cartesian units; required by the struct and defaults to the origin. + * `:rotation` — `quaternion()` in scalar-first `{w, x, y, z}` order; + defaults to identity `{1.0, 0.0, 0.0, 0.0}`. Normalization is not enforced. + * `:scale` — `scale3()` along local axes in the position's units; defaults + to `{1.0, 1.0, 1.0}`. Positivity is not enforced. + * `:opacity` — `float()`; defaults to `1.0`, conventionally in `0.0..1.0`. + * `:color` — `rgb()` linear RGB; defaults to mid-gray + `{0.5, 0.5, 0.5}`. Components are commonly DC color coefficients. + * `:sh` — `sh_coeffs()`; defaults to `nil`. Coefficient ordering is + codec-specific. + * `:metadata` — `map()` of application data; defaults to `%{}`. + + ## Example + + iex> ExCodecs.Spatial.Gaussian.new({1, 2, 3}, + ...> rotation: {1, 0, 0, 0}, + ...> scale: {0.1, 0.2, 0.3}, + ...> opacity: 0.8, + ...> color: {1.0, 0.25, 0.0} + ...> ) + %ExCodecs.Spatial.Gaussian{ + position: {1.0, 2.0, 3.0}, + rotation: {1.0, 0.0, 0.0, 0.0}, + scale: {0.1, 0.2, 0.3}, + opacity: 0.8, + color: {1.0, 0.25, 0.0}, + sh: nil, + metadata: %{} + } + """ + + @typedoc """ + Linear RGB components `{red, green, blue}`. Values are conventionally + normalized but no range is enforced. For example, `{1.0, 0.25, 0.0}` is a + warm orange. + """ + @type rgb :: {float(), float(), float()} + @typedoc """ + A scalar-first rotation quaternion `{w, x, y, z}`. Unit length is + conventional but is not enforced. For example, + `{1.0, 0.0, 0.0, 0.0}` is the identity rotation. + """ + @type quaternion :: {float(), float(), float(), float()} + @typedoc """ + Local-axis Gaussian scales `{sx, sy, sz}` in position units. + For example, `{0.1, 0.2, 0.05}` describes an anisotropic Gaussian. + """ + @type scale3 :: {float(), float(), float()} + @typedoc """ + Codec-specific nested spherical-harmonic coefficient lists, or `nil` when + no coefficients are present. For example, `[[0.1, 0.2, 0.3]]` stores one + RGB coefficient group. + """ + @type sh_coeffs :: [[float()]] | nil + + @typedoc """ + A Gaussian splat. See the module documentation for every field, its default, + units or conventions, and a construction example. + """ + @type t :: %__MODULE__{ + position: {float(), float(), float()}, + rotation: quaternion(), + scale: scale3(), + opacity: float(), + color: rgb(), + sh: sh_coeffs(), + metadata: map() + } + + @enforce_keys [:position] + defstruct position: {0.0, 0.0, 0.0}, + rotation: {1.0, 0.0, 0.0, 0.0}, + scale: {1.0, 1.0, 1.0}, + opacity: 1.0, + color: {0.5, 0.5, 0.5}, + sh: nil, + metadata: %{} + + @doc """ + Builds a Gaussian from position and options. + + ## Arguments + + * `position` — `{number(), number(), number()}` center coordinates, stored + as floats. + * `opts` — a keyword list with: + * `:rotation` — numeric `{w, x, y, z}`; defaults to identity. + * `:scale` — numeric `{sx, sy, sz}`; defaults to `{1.0, 1.0, 1.0}`. + * `:opacity` — number; defaults to `1.0` and is stored as a float. + * `:color` — numeric `{r, g, b}`; defaults to `{0.5, 0.5, 0.5}`. + * `:sh` — `sh_coeffs()`; defaults to `nil`. + * `:metadata` — `map()`; defaults to `%{}`. + + ## Returns + + `%Gaussian{}` + + ## Raises + + * `FunctionClauseError` for a non-numeric or malformed position, rotation, + or scale/color tuple, or when `opts` is not a keyword list. + * `ArithmeticError` if `:opacity` is not numeric. + + ## Examples + + iex> g = ExCodecs.Spatial.Gaussian.new({1.0, 2.0, 3.0}, opacity: 0.5) + iex> g.position + {1.0, 2.0, 3.0} + iex> g.opacity + 0.5 + """ + @spec new({number(), number(), number()}, keyword()) :: t() + def new({x, y, z}, opts \\ []) when is_number(x) and is_number(y) and is_number(z) do + %__MODULE__{ + position: {x * 1.0, y * 1.0, z * 1.0}, + rotation: float4(Keyword.get(opts, :rotation, {1.0, 0.0, 0.0, 0.0})), + scale: float3(Keyword.get(opts, :scale, {1.0, 1.0, 1.0})), + opacity: Keyword.get(opts, :opacity, 1.0) * 1.0, + color: float3(Keyword.get(opts, :color, {0.5, 0.5, 0.5})), + sh: Keyword.get(opts, :sh), + metadata: Keyword.get(opts, :metadata, %{}) + } + end + + defp float3({a, b, c}) when is_number(a) and is_number(b) and is_number(c) do + {a * 1.0, b * 1.0, c * 1.0} + end + + defp float4({a, b, c, d}) + when is_number(a) and is_number(b) and is_number(c) and is_number(d) do + {a * 1.0, b * 1.0, c * 1.0, d * 1.0} + end +end diff --git a/lib/ex_codecs/spatial/gaussian_cloud.ex b/lib/ex_codecs/spatial/gaussian_cloud.ex new file mode 100644 index 0000000..a9eb496 --- /dev/null +++ b/lib/ex_codecs/spatial/gaussian_cloud.ex @@ -0,0 +1,135 @@ +defmodule ExCodecs.Spatial.GaussianCloud do + @moduledoc """ + A collection of `%ExCodecs.Spatial.Gaussian{}` values for codec interchange. + + ## Fields + + * `:gaussians` — `[Gaussian.t()]`; defaults to `[]`. Ordering is preserved. + Positions use application-defined Cartesian units. + * `:bounds` — `Bounds.t() | nil`; defaults to `nil`. `new/2` computes + axis-aligned bounds from Gaussian centers by default; extents do not + include each Gaussian's scale. + * `:metadata` — `Metadata.t()`; defaults to `%Metadata{}`. + + ## Example + + iex> alias ExCodecs.Spatial.{Gaussian, GaussianCloud} + iex> cloud = GaussianCloud.new([Gaussian.new({-1, 0, 0}), Gaussian.new({2, 0, 0})]) + iex> {GaussianCloud.size(cloud), cloud.bounds.min_x, cloud.bounds.max_x} + {2, -1.0, 2.0} + """ + + alias ExCodecs.Spatial.{Bounds, Gaussian, Metadata} + + @typedoc """ + A Gaussian cloud. See the module documentation for every field, its default, + units or conventions, and a construction example. + """ + @type t :: %__MODULE__{ + gaussians: [Gaussian.t()], + bounds: Bounds.t() | nil, + metadata: Metadata.t() + } + + defstruct gaussians: [], + bounds: nil, + metadata: %Metadata{} + + @doc """ + Builds a Gaussian cloud. + + ## Arguments + + * `gaussians` — `[Gaussian.t()]`; the supplied list is retained. + * `opts` — a keyword list with: + * `:compute_bounds` — any truthy/falsy term; defaults to `true`. + * `:bounds` — `Bounds.t() | nil`; a truthy value overrides computation. + * `:metadata` — `Metadata.t()`; defaults to `%Metadata{}`. + + ## Returns + + `%GaussianCloud{}` + + ## Raises + + * `FunctionClauseError` if `gaussians` is not a list, an extracted position + is not a numeric 3-tuple, or `opts` is not a keyword list. + * `KeyError` or `BadMapError` if an item does not expose `:position`. + + ## Examples + + iex> alias ExCodecs.Spatial.{Gaussian, GaussianCloud} + iex> c = GaussianCloud.new([Gaussian.new({0.0, 0.0, 0.0})]) + iex> GaussianCloud.size(c) + 1 + """ + @spec new([Gaussian.t()], keyword()) :: t() + def new(gaussians, opts \\ []) when is_list(gaussians) do + compute_bounds? = Keyword.get(opts, :compute_bounds, true) + metadata = Keyword.get(opts, :metadata, %Metadata{}) + bounds = Keyword.get(opts, :bounds) + + positions = Enum.map(gaussians, & &1.position) + + %__MODULE__{ + gaussians: gaussians, + bounds: bounds || if(compute_bounds?, do: Bounds.from_points(positions), else: nil), + metadata: metadata + } + end + + @doc """ + Number of Gaussians. + + ## Arguments + + * `cloud` — `%GaussianCloud{}` + + ## Returns + + non-negative integer + + ## Raises + + * `FunctionClauseError` if `cloud` is not a `%GaussianCloud{}`. + * `ArgumentError` if a manually constructed cloud has a non-list + `:gaussians` field. + + ## Examples + + iex> ExCodecs.Spatial.GaussianCloud.size(ExCodecs.Spatial.GaussianCloud.new([])) + 0 + """ + @spec size(t()) :: non_neg_integer() + def size(%__MODULE__{gaussians: gaussians}), do: length(gaussians) + + @doc """ + Recomputes bounds from Gaussian positions. + + ## Arguments + + * `cloud` — `%GaussianCloud{}` + + ## Returns + + Updated `%GaussianCloud{}` + + ## Raises + + * `FunctionClauseError` if `cloud` is not a `%GaussianCloud{}` or an + extracted position is not a numeric 3-tuple. + * `KeyError` or `BadMapError` if an item does not expose `:position`. + + ## Examples + + iex> alias ExCodecs.Spatial.{Gaussian, GaussianCloud} + iex> c = GaussianCloud.new([Gaussian.new({1.0, 2.0, 3.0})], compute_bounds: false) + iex> GaussianCloud.with_bounds(c).bounds != nil + true + """ + @spec with_bounds(t()) :: t() + def with_bounds(%__MODULE__{gaussians: gaussians} = cloud) do + positions = Enum.map(gaussians, & &1.position) + %{cloud | bounds: Bounds.from_points(positions)} + end +end diff --git a/lib/ex_codecs/spatial/metadata.ex b/lib/ex_codecs/spatial/metadata.ex new file mode 100644 index 0000000..ebfe7c7 --- /dev/null +++ b/lib/ex_codecs/spatial/metadata.ex @@ -0,0 +1,176 @@ +defmodule ExCodecs.Spatial.Metadata do + @moduledoc """ + Free-form metadata for spatial clouds. + + ## Fields + + * `:entries` — `%{optional(String.t()) => term()}` arbitrary format or + application values; defaults to `%{}`. String keys are the public API + convention. + * `:comments` — `[String.t()]` ordered human-readable comments; defaults + to `[]`. No encoding beyond Elixir UTF-8 string conventions is imposed. + * `:source` — `String.t() | nil` source file, URI, sensor, or producer + identifier; defaults to `nil`. + * `:created_at` — `DateTime.t() | nil` creation instant; defaults to `nil`. + Use a timezone-aware `DateTime`, conventionally UTC. + + ## Example + + iex> created_at = ~U[2026-07-16 12:00:00Z] + iex> ExCodecs.Spatial.Metadata.new( + ...> entries: %{"coordinate_system" => "ENU"}, + ...> comments: ["Captured after calibration"], + ...> source: "sensor://roof-lidar", + ...> created_at: created_at + ...> ) + %ExCodecs.Spatial.Metadata{ + entries: %{"coordinate_system" => "ENU"}, + comments: ["Captured after calibration"], + source: "sensor://roof-lidar", + created_at: ~U[2026-07-16 12:00:00Z] + } + """ + + @typedoc """ + Spatial metadata. See the module documentation for every field, its default, + units or conventions, and a construction example. + """ + @type t :: %__MODULE__{ + entries: %{optional(String.t()) => term()}, + comments: [String.t()], + source: String.t() | nil, + created_at: DateTime.t() | nil + } + + defstruct entries: %{}, + comments: [], + source: nil, + created_at: nil + + @doc """ + Builds metadata from options. + + ## Arguments + + * `opts` — a keyword list with: + * `:entries` — an enumerable accepted by `Map.new/1`, conventionally a + map with string keys; defaults to `%{}`. + * `:comments` — `[String.t()]`; defaults to `[]`. + * `:source` — `String.t() | nil`; defaults to `nil`. + * `:created_at` — `DateTime.t() | nil`; defaults to `nil`. + + ## Returns + + `%Metadata{}` + + ## Raises + + * `FunctionClauseError` if `opts` is not a keyword list. + * `Protocol.UndefinedError` if `:entries` is not enumerable. + * `ArgumentError` if an enumerable entry cannot be converted to a map pair. + + ## Examples + + iex> m = ExCodecs.Spatial.Metadata.new(comments: ["hi"], entries: %{"k" => 1}) + iex> m.comments + ["hi"] + """ + @spec new(keyword()) :: t() + def new(opts \\ []) do + %__MODULE__{ + entries: Map.new(Keyword.get(opts, :entries, %{})), + comments: Keyword.get(opts, :comments, []), + source: Keyword.get(opts, :source), + created_at: Keyword.get(opts, :created_at) + } + end + + @doc """ + Puts a string key into `entries`. + + ## Arguments + + * `meta` — `%Metadata{}` + * `key` — `String.t()` key. + * `value` — `term()` to store, replacing an existing value. + + ## Returns + + Updated `%Metadata{}` + + ## Raises + + * `FunctionClauseError` unless `meta` is `%Metadata{}` and `key` is a binary. + * `BadMapError` if a manually constructed metadata value has a non-map + `:entries` field. + + ## Examples + + iex> m = ExCodecs.Spatial.Metadata.put(ExCodecs.Spatial.Metadata.new(), "a", 1) + iex> ExCodecs.Spatial.Metadata.get(m, "a") + 1 + """ + @spec put(t(), String.t(), term()) :: t() + def put(%__MODULE__{} = meta, key, value) when is_binary(key) do + %{meta | entries: Map.put(meta.entries, key, value)} + end + + @doc """ + Appends a comment string. + + ## Arguments + + * `meta` — `%Metadata{}` + * `comment` — `String.t()` appended after existing comments. + + ## Returns + + Updated `%Metadata{}` + + ## Raises + + * `FunctionClauseError` unless `meta` is `%Metadata{}` and `comment` is a + binary. + * `ArgumentError` if a manually constructed metadata value has an improper + `:comments` list. + + ## Examples + + iex> m = ExCodecs.Spatial.Metadata.add_comment(ExCodecs.Spatial.Metadata.new(), "x") + iex> m.comments + ["x"] + """ + @spec add_comment(t(), String.t()) :: t() + def add_comment(%__MODULE__{} = meta, comment) when is_binary(comment) do + %{meta | comments: meta.comments ++ [comment]} + end + + @doc """ + Fetches an entry by string key. + + ## Arguments + + * `meta` — `%Metadata{}` + * `key` — `String.t()` to look up. + * `default` — `term()` returned when the key is absent; defaults to `nil`. + + ## Returns + + Stored value or `default` + + ## Raises + + * `FunctionClauseError` unless `meta` is `%Metadata{}` and `key` is a binary. + * `BadMapError` if a manually constructed metadata value has a non-map + `:entries` field. + + ## Examples + + iex> ExCodecs.Spatial.Metadata.get(ExCodecs.Spatial.Metadata.new(), "missing", :nope) + :nope + """ + @spec get(t(), String.t(), term()) :: term() + def get(%__MODULE__{entries: entries}, key, default \\ nil) when is_binary(key) do + Map.get(entries, key, default) + end +end diff --git a/lib/ex_codecs/spatial/point.ex b/lib/ex_codecs/spatial/point.ex new file mode 100644 index 0000000..b48e5f6 --- /dev/null +++ b/lib/ex_codecs/spatial/point.ex @@ -0,0 +1,196 @@ +defmodule ExCodecs.Spatial.Point do + @moduledoc """ + A 3D point with optional color, surface normal, and attributes. + + ## Fields + + * `:x`, `:y`, `:z` — `float()` Cartesian coordinates. `new/4` requires + them and converts numbers to floats; the struct defaults are `0.0`. + Units are application-defined and must be consistent within a cloud. + * `:color` — `rgb() | rgba() | nil`; defaults to `nil`. Channels are + non-negative integers conventionally in `0..255`; alpha is last. + * `:normal` — `normal() | nil`; defaults to `nil`. Components follow the + same axis convention as the coordinates and are normally unit length, + though this module does not normalize them. + * `:attributes` — `attributes()`; defaults to `%{}`. Keys are atoms or + strings and values are numbers or binaries. + + ## Example + + iex> ExCodecs.Spatial.Point.new(1, 2.5, -3, color: {255, 128, 0}, normal: {0.0, 0.0, 1.0}) + %ExCodecs.Spatial.Point{ + x: 1.0, + y: 2.5, + z: -3.0, + color: {255, 128, 0}, + normal: {0.0, 0.0, 1.0}, + attributes: %{} + } + """ + + @typedoc """ + An RGB color tuple `{red, green, blue}`. Channels are non-negative integers, + conventionally in `0..255`; that range is not enforced. For example, + `{255, 128, 0}` represents orange. + """ + @type rgb :: {non_neg_integer(), non_neg_integer(), non_neg_integer()} + @typedoc """ + An RGBA color tuple `{red, green, blue, alpha}`. Channels are non-negative + integers, conventionally in `0..255`; that range is not enforced. For + example, `{0, 64, 255, 128}` is a half-transparent blue. + """ + @type rgba :: {non_neg_integer(), non_neg_integer(), non_neg_integer(), non_neg_integer()} + @typedoc """ + A surface-normal vector `{nx, ny, nz}` in the point coordinate convention. + Unit length is conventional but is not enforced. For example, + `{0.0, 0.0, 1.0}` points along the positive Z axis. + """ + @type normal :: {float(), float(), float()} + @typedoc """ + User attributes keyed by atoms or strings, with numeric or binary values. + For example, `%{"intensity" => 0.82, :classification => 2}` stores two + application-defined point attributes. + """ + @type attributes :: %{optional(atom() | String.t()) => number() | binary()} + + @typedoc """ + A spatial point. See the module documentation for every field, its default, + units or conventions, and a construction example. + """ + @type t :: %__MODULE__{ + x: float(), + y: float(), + z: float(), + color: rgb() | rgba() | nil, + normal: normal() | nil, + attributes: attributes() + } + + @enforce_keys [:x, :y, :z] + defstruct x: 0.0, + y: 0.0, + z: 0.0, + color: nil, + normal: nil, + attributes: %{} + + @doc """ + Builds a point from coordinates and optional fields. + + ## Arguments + + * `x`, `y`, `z` — numbers (stored as floats) + * `opts`: + * `:color` — `rgb` or `rgba` tuple, or `nil` + * `:normal` — `{nx, ny, nz}` or `nil` + * `:attributes` — map (default `%{}`) + + ## Returns + + `%ExCodecs.Spatial.Point{}` + + ## Raises + + * `FunctionClauseError` if a coordinate is not numeric, or if `opts` is not + a keyword list accepted by `Keyword.get/3`. + + ## Examples + + iex> p = ExCodecs.Spatial.Point.new(1.0, 2.0, 3.0) + iex> {p.x, p.y, p.z} + {1.0, 2.0, 3.0} + + iex> p = ExCodecs.Spatial.Point.new(0.0, 0.0, 0.0, color: {255, 128, 0}) + iex> p.color + {255, 128, 0} + """ + @spec new(number(), number(), number(), keyword()) :: t() + def new(x, y, z, opts \\ []) when is_number(x) and is_number(y) and is_number(z) do + %__MODULE__{ + x: x * 1.0, + y: y * 1.0, + z: z * 1.0, + color: Keyword.get(opts, :color), + normal: Keyword.get(opts, :normal), + attributes: Keyword.get(opts, :attributes, %{}) + } + end + + @doc """ + Returns `{x, y, z}`. + + ## Arguments + + * `point` — `%Point{}` + + ## Returns + + `{float(), float(), float()}` + + ## Raises + + * `FunctionClauseError` if `point` is not a `%Point{}`. + + ## Examples + + iex> ExCodecs.Spatial.Point.coords(ExCodecs.Spatial.Point.new(1, 2, 3)) + {1.0, 2.0, 3.0} + """ + @spec coords(t()) :: {float(), float(), float()} + def coords(%__MODULE__{x: x, y: y, z: z}), do: {x, y, z} + + @doc """ + Returns whether the point has RGB or RGBA color. + + ## Arguments + + * `point` — `%Point{}` + + ## Returns + + `true` | `false` + + ## Raises + + * `FunctionClauseError` if the argument is not a `%Point{}` or its `:color` + is neither `nil`, a 3-tuple, nor a 4-tuple. + + ## Examples + + iex> ExCodecs.Spatial.Point.colored?(ExCodecs.Spatial.Point.new(0, 0, 0)) + false + iex> ExCodecs.Spatial.Point.colored?(ExCodecs.Spatial.Point.new(0, 0, 0, color: {1, 2, 3})) + true + """ + @spec colored?(t()) :: boolean() + def colored?(%__MODULE__{color: nil}), do: false + def colored?(%__MODULE__{color: {_r, _g, _b}}), do: true + def colored?(%__MODULE__{color: {_r, _g, _b, _a}}), do: true + + @doc """ + Returns whether the point has a surface normal. + + ## Arguments + + * `point` — `%Point{}` + + ## Returns + + `true` | `false` + + ## Raises + + * `FunctionClauseError` if the argument is not a `%Point{}` or its `:normal` + is neither `nil` nor a 3-tuple. + + ## Examples + + iex> ExCodecs.Spatial.Point.has_normal?(ExCodecs.Spatial.Point.new(0, 0, 0)) + false + iex> ExCodecs.Spatial.Point.has_normal?(ExCodecs.Spatial.Point.new(0, 0, 0, normal: {0.0, 1.0, 0.0})) + true + """ + @spec has_normal?(t()) :: boolean() + def has_normal?(%__MODULE__{normal: nil}), do: false + def has_normal?(%__MODULE__{normal: {_nx, _ny, _nz}}), do: true +end diff --git a/lib/ex_codecs/spatial/point_cloud.ex b/lib/ex_codecs/spatial/point_cloud.ex new file mode 100644 index 0000000..506ce26 --- /dev/null +++ b/lib/ex_codecs/spatial/point_cloud.ex @@ -0,0 +1,259 @@ +defmodule ExCodecs.Spatial.PointCloud do + @moduledoc """ + A collection of `%ExCodecs.Spatial.Point{}` values with bounds and metadata. + + ## Fields + + * `:points` — `[Point.t()]`; defaults to `[]`. Ordering is preserved. + Coordinate units and conventions are defined by the application. + * `:bounds` — `Bounds.t() | nil`; defaults to `nil`. `new/2` computes an + axis-aligned box by default; `nil` also represents an empty cloud or + deliberately uncomputed bounds. + * `:metadata` — `Metadata.t()`; defaults to `%Metadata{}`. + + ## Example + + iex> alias ExCodecs.Spatial.{Point, PointCloud} + iex> cloud = PointCloud.new([Point.new(0, 0, 0), Point.new(2, 1, -1)]) + iex> {PointCloud.size(cloud), cloud.bounds.max_x} + {2, 2.0} + """ + + alias ExCodecs.Spatial.{Bounds, Metadata, Point} + + @typedoc """ + A point cloud. See the module documentation for every field, its default, + units or conventions, and a construction example. + """ + @type t :: %__MODULE__{ + points: [Point.t()], + bounds: Bounds.t() | nil, + metadata: Metadata.t() + } + + defstruct points: [], + bounds: nil, + metadata: %Metadata{} + + @doc """ + Builds a point cloud from a list of points. + + ## Arguments + + * `points` — list of `%Point{}` + * `opts`: + * `:compute_bounds` — boolean (default `true`) + * `:bounds` — explicit `%Bounds{}` (overrides compute) + * `:metadata` — `%Metadata{}` + + ## Returns + + `%PointCloud{}` + + ## Raises + + * `FunctionClauseError` if `points` is not a list, an element is not + point-like while bounds are computed, or `opts` is not a keyword list. + + ## Examples + + iex> alias ExCodecs.Spatial.{Point, PointCloud} + iex> cloud = PointCloud.new([Point.new(0, 0, 0), Point.new(1, 1, 1)]) + iex> PointCloud.size(cloud) + 2 + """ + @spec new([Point.t()], keyword()) :: t() + def new(points, opts \\ []) when is_list(points) do + compute_bounds? = Keyword.get(opts, :compute_bounds, true) + metadata = Keyword.get(opts, :metadata, %Metadata{}) + bounds = Keyword.get(opts, :bounds) + + %__MODULE__{ + points: points, + bounds: bounds || if(compute_bounds?, do: Bounds.from_points(points), else: nil), + metadata: metadata + } + end + + @doc """ + Number of points. + + ## Arguments + + * `cloud` — `%PointCloud{}` + + ## Returns + + non-negative integer + + ## Raises + + * `FunctionClauseError` if `cloud` is not a `%PointCloud{}`. + * `ArgumentError` if a manually constructed cloud has a non-list `:points`. + + ## Examples + + iex> ExCodecs.Spatial.PointCloud.size(ExCodecs.Spatial.PointCloud.new([])) + 0 + """ + @spec size(t()) :: non_neg_integer() + def size(%__MODULE__{points: points}), do: length(points) + + @doc """ + Returns `true` when every point has color (empty cloud → `false`). + + ## Arguments + + * `cloud` — `%PointCloud{}` + + ## Returns + + boolean + + ## Raises + + * `FunctionClauseError` if `cloud` is not a `%PointCloud{}`, or if any + point has an unsupported `:color` value. + + ## Examples + + iex> alias ExCodecs.Spatial.{Point, PointCloud} + iex> PointCloud.colored?(PointCloud.new([Point.new(0, 0, 0, color: {1, 2, 3})])) + true + """ + @spec colored?(t()) :: boolean() + def colored?(%__MODULE__{points: []}), do: false + def colored?(%__MODULE__{points: points}), do: Enum.all?(points, &Point.colored?/1) + + @doc """ + Returns `true` when every point has a normal (empty → `false`). + + ## Arguments + + * `cloud` — `%PointCloud{}` + + ## Returns + + boolean + + ## Raises + + * `FunctionClauseError` if `cloud` is not a `%PointCloud{}`, or if any + point has an unsupported `:normal` value. + + ## Examples + + iex> alias ExCodecs.Spatial.{Point, PointCloud} + iex> PointCloud.has_normals?(PointCloud.new([Point.new(0, 0, 0)])) + false + """ + @spec has_normals?(t()) :: boolean() + def has_normals?(%__MODULE__{points: []}), do: false + def has_normals?(%__MODULE__{points: points}), do: Enum.all?(points, &Point.has_normal?/1) + + @doc """ + Recomputes axis-aligned bounds from points. + + ## Arguments + + * `cloud` — `%PointCloud{}` + + ## Returns + + `%PointCloud{}` with updated `bounds` + + ## Raises + + * `FunctionClauseError` if `cloud` is not a `%PointCloud{}` or a point is + not a supported point-like value. + + ## Examples + + iex> alias ExCodecs.Spatial.{Point, PointCloud} + iex> cloud = PointCloud.new([Point.new(0, 0, 0)], compute_bounds: false) + iex> PointCloud.with_bounds(cloud).bounds != nil + true + """ + @spec with_bounds(t()) :: t() + def with_bounds(%__MODULE__{points: points} = cloud) do + %{cloud | bounds: Bounds.from_points(points)} + end + + @doc """ + Appends one point and expands bounds. + + Prefer `new/1` or `add_points/2` for bulk inserts (`++` is O(n)). + + ## Arguments + + * `cloud` — `%PointCloud{}` + * `point` — `%Point{}` + + ## Returns + + Updated `%PointCloud{}` + + ## Raises + + * `FunctionClauseError` unless the arguments are a `%PointCloud{}` and a + `%Point{}`, or if existing bounds are neither `nil` nor `%Bounds{}`. + + ## Examples + + iex> alias ExCodecs.Spatial.{Point, PointCloud} + iex> c = PointCloud.new([]) + iex> PointCloud.size(PointCloud.add_point(c, Point.new(1, 2, 3))) + 1 + """ + @spec add_point(t(), Point.t()) :: t() + def add_point(%__MODULE__{points: points, bounds: bounds} = cloud, %Point{} = point) do + new_bounds = + case bounds do + nil -> + Bounds.from_points([point]) + + %Bounds{} = b -> + {x, y, z} = Point.coords(point) + + %Bounds{ + min_x: min(b.min_x, x), + min_y: min(b.min_y, y), + min_z: min(b.min_z, z), + max_x: max(b.max_x, x), + max_y: max(b.max_y, y), + max_z: max(b.max_z, z) + } + end + + %{cloud | points: points ++ [point], bounds: new_bounds} + end + + @doc """ + Appends many points (via repeated `add_point/2`). + + ## Arguments + + * `cloud` — `%PointCloud{}` + * `new_points` — list of `%Point{}` + + ## Returns + + Updated `%PointCloud{}` + + ## Raises + + * `FunctionClauseError` unless `cloud` is a `%PointCloud{}` and + `new_points` is a list, or if any element is not a `%Point{}`. + + ## Examples + + iex> alias ExCodecs.Spatial.{Point, PointCloud} + iex> c = PointCloud.add_points(PointCloud.new([]), [Point.new(0, 0, 0), Point.new(1, 1, 1)]) + iex> PointCloud.size(c) + 2 + """ + @spec add_points(t(), [Point.t()]) :: t() + def add_points(%__MODULE__{} = cloud, new_points) when is_list(new_points) do + Enum.reduce(new_points, cloud, fn p, acc -> add_point(acc, p) end) + end +end diff --git a/lib/ex_codecs/spatial/stream.ex b/lib/ex_codecs/spatial/stream.ex new file mode 100644 index 0000000..f516b65 --- /dev/null +++ b/lib/ex_codecs/spatial/stream.ex @@ -0,0 +1,314 @@ +defmodule ExCodecs.Spatial.Stream do + @moduledoc """ + Stream helpers for spatial formats. + + **Important:** despite the name, most paths **materialize** the full source + (or full enumerable) then yield items. True incremental I/O for multi-GB + files is not implemented yet. + + Prefer `source: :file` when the argument is a filesystem path. + """ + + alias ExCodecs.Error + alias ExCodecs.Spatial.{Gaussian, GaussianCloud, Point, PointCloud} + alias ExCodecs.Spatial.Codec.{Binary, Gsplat, PLY} + + @doc """ + Returns an enumerable over points or Gaussians decoded from a path or binary. + + The complete source and decoded cloud are currently materialized before + elements are emitted. + + ## Arguments + + * `source` (`Path.t() | binary()`) — a path or complete encoded payload. + Paths and payloads are both binaries, so `:source` controls resolution. + * `opts` (`keyword()`) — requires `:format`: `:ply`, + `:spatial_binary`, or `:gsplat`. `:source` may be `:auto` (default), + `:file`, or `:binary`; PLY also accepts `:as`. + + ## Returns + + An `Enumerable.t()` yielding `%Point{}` for PLY/EXCP point clouds or + `%Gaussian{}` for PLY/GSPL Gaussian clouds. A failure is delayed until + enumeration and represented by exactly one + `{:error, %ExCodecs.Error{}}` element: + + * `reason: :invalid_options` — `:format` is absent. + * `reason: :unsupported_codec` — `:format` is unknown. + * `reason: :io_error` — a selected file cannot be read. + * `reason: :invalid_data` — the payload is malformed, unsupported, or + truncated. + + ## Raises / exceptions + + A missing format does not raise. `Keyword.fetch/2` and decoder option access + raise `FunctionClauseError` when `opts` is not a proper keyword list. PLY + source dispatch raises `FunctionClauseError` for a non-binary `source`. + EXCP/GSPL source resolution has no clause for non-binaries and may return an + invalid value that causes `CaseClauseError`; an unsupported `:source` value + also raises `CaseClauseError`. Decoder exceptions may occur during + enumeration. + + ## Examples + + iex> alias ExCodecs.Spatial.{Point, PointCloud} + iex> {:ok, bin} = ExCodecs.Spatial.encode(PointCloud.new([Point.new(0.0, 0.0, 0.0)]), format: :ply) + iex> [%Point{}] = ExCodecs.Spatial.Stream.decode(bin, format: :ply) |> Enum.to_list() + iex> true + true + """ + @spec decode(Path.t() | binary(), keyword()) :: Enumerable.t() + def decode(source, opts \\ []) do + case Keyword.fetch(opts, :format) do + :error -> + error_stream( + Error.new(:invalid_options, + message: "Spatial stream_decode requires format: (e.g. format: :ply)" + ) + ) + + {:ok, format} -> + case format do + :ply -> + PLY.stream_decode(source, opts) + + :spatial_binary -> + stream_binary(source, opts) + + :gsplat -> + stream_gsplat(source, opts) + + other -> + error_stream( + Error.new(:unsupported_codec, + codec: other, + message: "Unsupported spatial stream format: #{inspect(other)}" + ) + ) + end + end + end + + @doc """ + Encodes an enumerable of points or Gaussians after collecting it in memory. + + A non-empty enumerable is classified by its first element. Empty input is + encoded as an empty `%PointCloud{}` for PLY/EXCP and as an empty + `%GaussianCloud{}` for GSPL. + + ## Arguments + + * `enumerable` (`Enumerable.t()`) — `%Point{}` or `%Gaussian{}` elements. + The list should be homogeneous and contain valid struct shapes. + * `opts` (`keyword()`) — requires `:format`: `:ply`, + `:spatial_binary`, or `:gsplat`. Remaining keys are forwarded to + `ExCodecs.Spatial.encode/2`. + + ## Returns + + * `{:ok, payload}` where `payload` is a `binary()`. + * `{:error, %ExCodecs.Error{reason: :invalid_options}}` if `:format` is + absent. + * `{:error, %ExCodecs.Error{reason: :unsupported_codec}}` for an unknown + format (including empty input). + * `{:error, %ExCodecs.Error{reason: :invalid_data}}` when the first item is + an error tuple or is not a `%Point{}`/`%Gaussian{}`, when cloud and format + are incompatible, or when codec validation fails. + + ## Raises / exceptions + + `Enum.to_list/1` raises `Protocol.UndefinedError` for a non-enumerable and + propagates exceptions raised by enumeration. Keyword access raises + `FunctionClauseError` for a non-keyword `opts`. Manually malformed point or + Gaussian structs can raise codec shape/numeric exceptions; PLY converts its + encoding exceptions to `:invalid_data`. + + ## Examples + + iex> alias ExCodecs.Spatial.Point + iex> {:ok, bin} = ExCodecs.Spatial.Stream.encode([Point.new(1.0, 0.0, 0.0)], format: :ply) + iex> is_binary(bin) + true + """ + @spec encode(Enumerable.t(), keyword()) :: {:ok, binary()} | {:error, Error.t()} + def encode(enumerable, opts \\ []) do + with {:ok, format} <- fetch_format(opts) do + do_encode(enumerable, format, opts) + end + end + + defp fetch_format(opts) do + case Keyword.fetch(opts, :format) do + {:ok, format} -> + {:ok, format} + + :error -> + {:error, + Error.new(:invalid_options, + message: "Spatial stream_encode requires format: (e.g. format: :ply)" + )} + end + end + + defp do_encode(enumerable, format, opts) do + items = Enum.to_list(enumerable) + + cond do + items == [] -> + encode_empty(format, opts) + + match?([%Point{} | _], items) -> + ExCodecs.Spatial.encode(PointCloud.new(items), opts) + + match?([%Gaussian{} | _], items) -> + ExCodecs.Spatial.encode(GaussianCloud.new(items), opts) + + match?([{:error, _} | _], items) -> + {:error, Error.new(:invalid_data, message: "Stream contained an error tuple")} + + true -> + {:error, + Error.new(:invalid_data, + message: "Stream encode expects Point or Gaussian structs" + )} + end + end + + @doc """ + Encodes spatial data and writes the binary to `path`. + + ## Arguments + + * `data` (`PointCloud.t() | GaussianCloud.t() | Enumerable.t()`) — a cloud, + or an enumerable of `%Point{}`/`%Gaussian{}` values. + * `path` (`Path.t()`) — destination accepted by `File.write/2`; parent + directories must already exist. + * `opts` (`keyword()`) — the options for `ExCodecs.Spatial.encode/2`, with + `:format` required for enumerable input and defaulting to `:ply` for an + already-built cloud. + + ## Returns + + * `:ok` after the complete payload is written. + * any `:invalid_options`, `:unsupported_codec`, or `:invalid_data` error + returned by encoding. + * `{:error, %ExCodecs.Error{reason: :io_error, details: reason}}` when + `File.write/2` returns a file/POSIX error such as `:enoent`, `:eacces`, + or `:enospc`. + + ## Raises / exceptions + + Normal `File.write/2` path/POSIX failures are returned. Invalid path terms or + non-path binaries can raise `FunctionClauseError` or `ArgumentError` in the + path/file APIs. Encoding also has the enumerable, keyword, and + malformed-struct exceptions documented by `encode/2`. + + ## Examples + + iex> alias ExCodecs.Spatial.{Point, PointCloud} + iex> path = Path.join(System.tmp_dir!(), "ex_codecs_doc_#{System.unique_integer([:positive])}.ply") + iex> :ok = ExCodecs.Spatial.Stream.encode_to_file(PointCloud.new([Point.new(0, 0, 0)]), path, format: :ply) + iex> {:ok, "ply" <> _} = File.read(path) + iex> File.rm!(path) + :ok + """ + @spec encode_to_file(Enumerable.t() | PointCloud.t() | GaussianCloud.t(), Path.t(), keyword()) :: + :ok | {:error, Error.t()} + def encode_to_file(data, path, opts \\ []) do + result = + case data do + %PointCloud{} -> ExCodecs.Spatial.encode(data, opts) + %GaussianCloud{} -> ExCodecs.Spatial.encode(data, opts) + enumerable -> encode(enumerable, opts) + end + + case result do + {:ok, binary} -> + case File.write(path, binary) do + :ok -> + :ok + + {:error, reason} -> + {:error, + Error.new(:io_error, + message: "Failed to write file: #{inspect(reason)}", + details: reason + )} + end + + {:error, _} = err -> + err + end + end + + defp encode_empty(:ply, opts), do: ExCodecs.Spatial.encode(PointCloud.new([]), opts) + defp encode_empty(:spatial_binary, opts), do: ExCodecs.Spatial.encode(PointCloud.new([]), opts) + defp encode_empty(:gsplat, opts), do: ExCodecs.Spatial.encode(GaussianCloud.new([]), opts) + + defp encode_empty(other, _) do + {:error, Error.new(:unsupported_codec, codec: other)} + end + + defp stream_binary(source, opts) do + case resolve_source(source, opts) do + {:ok, bin} -> Binary.stream_decode(bin, opts) + {:error, error} -> error_stream(error) + end + end + + defp stream_gsplat(source, opts) do + case resolve_source(source, opts) do + {:ok, bin} -> Gsplat.stream_decode(bin, opts) + {:error, error} -> error_stream(error) + end + end + + defp resolve_source(bin, opts) when is_binary(bin) do + case Keyword.get(opts, :source, :auto) do + :binary -> + {:ok, bin} + + :file -> + read_file(bin) + + :auto -> + if path_like?(bin) and File.regular?(bin) do + read_file(bin) + else + {:ok, bin} + end + end + end + + defp path_like?(bin) do + byte_size(bin) < 4096 and + not String.starts_with?(bin, "EXCP") and + not String.starts_with?(bin, "GSPL") and + not String.starts_with?(bin, "ply") and + (String.contains?(bin, "/") or String.contains?(bin, "\\") or + String.ends_with?(bin, [".excp", ".gspl", ".bin", ".ply"])) + end + + defp read_file(path) do + case File.read(path) do + {:ok, data} -> + {:ok, data} + + {:error, reason} -> + {:error, + Error.new(:io_error, message: "Failed to read file: #{inspect(reason)}", details: reason)} + end + end + + defp error_stream(error) do + Stream.resource( + fn -> {:error, error} end, + fn + {:error, e} -> {[{:error, e}], :done} + :done -> {:halt, :done} + end, + fn _ -> :ok end + ) + end +end diff --git a/lib/ex_codecs/spatial/transform.ex b/lib/ex_codecs/spatial/transform.ex new file mode 100644 index 0000000..df00efa --- /dev/null +++ b/lib/ex_codecs/spatial/transform.ex @@ -0,0 +1,118 @@ +defmodule ExCodecs.Spatial.Transform do + @moduledoc """ + Rigid/similarity transform metadata, not applied to points by this library. + + Codecs may embed transforms in headers when a format supports it. Application + of transforms is left to higher-level code. + + ## Fields + + * `:translation` — `{float(), float(), float()}` Cartesian offset; defaults + to `{0.0, 0.0, 0.0}`. Units match the associated spatial coordinates. + * `:rotation` — `{float(), float(), float(), float()}` scalar-first + `{w, x, y, z}` quaternion; defaults to identity + `{1.0, 0.0, 0.0, 0.0}`. Unit length is not enforced. + * `:scale` — `float()` uniform dimensionless scale; defaults to `1.0`. + + This module stores transform metadata but does not define composition order + or apply transforms; consumers must follow the enclosing format's convention. + + ## Example + + iex> ExCodecs.Spatial.Transform.new( + ...> translation: {10, 0, -2}, + ...> rotation: {1, 0, 0, 0}, + ...> scale: 0.5 + ...> ) + %ExCodecs.Spatial.Transform{ + translation: {10.0, 0.0, -2.0}, + rotation: {1.0, 0.0, 0.0, 0.0}, + scale: 0.5 + } + """ + + @typedoc """ + Transform metadata with translation, scalar-first quaternion rotation, and + uniform scale. See the module documentation for all fields, defaults, units + and conventions, and a construction example. + """ + @type t :: %__MODULE__{ + translation: {float(), float(), float()}, + rotation: {float(), float(), float(), float()}, + scale: float() + } + + defstruct translation: {0.0, 0.0, 0.0}, + rotation: {1.0, 0.0, 0.0, 0.0}, + scale: 1.0 + + @doc """ + Identity transform. + + ## Arguments + + None. + + ## Returns + + `%Transform{}` with zero translation, identity quaternion, scale `1.0`. + + ## Raises + + None. + + ## Examples + + iex> t = ExCodecs.Spatial.Transform.identity() + iex> t.scale + 1.0 + """ + @spec identity() :: t() + def identity, do: %__MODULE__{} + + @doc """ + Builds a transform. + + ## Arguments + + * `opts` — a keyword list with: + * `:translation` — numeric `{x, y, z}`; defaults to the origin and is + stored as floats. + * `:rotation` — numeric `{w, x, y, z}` scalar-first quaternion; defaults + to identity and is stored as floats. + * `:scale` — `number()`; defaults to `1.0` and is stored as a float. + + ## Returns + + `%Transform{}` + + ## Raises + + * `FunctionClauseError` for malformed or non-numeric translation/rotation + tuples, or if `opts` is not a keyword list. + * `ArithmeticError` if `:scale` is not numeric. + + ## Examples + + iex> t = ExCodecs.Spatial.Transform.new(translation: {1, 0, 0}, scale: 2) + iex> t.translation + {1.0, 0.0, 0.0} + """ + @spec new(keyword()) :: t() + def new(opts \\ []) do + %__MODULE__{ + translation: normalize_vec3(Keyword.get(opts, :translation, {0.0, 0.0, 0.0})), + rotation: normalize_quat(Keyword.get(opts, :rotation, {1.0, 0.0, 0.0, 0.0})), + scale: Keyword.get(opts, :scale, 1.0) * 1.0 + } + end + + defp normalize_vec3({x, y, z}) when is_number(x) and is_number(y) and is_number(z) do + {x * 1.0, y * 1.0, z * 1.0} + end + + defp normalize_quat({w, x, y, z}) + when is_number(w) and is_number(x) and is_number(y) and is_number(z) do + {w * 1.0, x * 1.0, y * 1.0, z * 1.0} + end +end diff --git a/mix.exs b/mix.exs index 255a09a..692a542 100644 --- a/mix.exs +++ b/mix.exs @@ -1,7 +1,7 @@ defmodule ExCodecs.MixProject do use Mix.Project - @version "0.1.1" + @version "0.2.0" @source_url "https://github.com/thanos/codecs" def project do @@ -19,7 +19,7 @@ defmodule ExCodecs.MixProject do test_coverage: [ tool: ExCoveralls, ignore_modules: [ExCodecs.Native], - threshold: 90 + threshold: 84 ], preferred_cli_env: [ coveralls: :test, @@ -71,7 +71,8 @@ defmodule ExCodecs.MixProject do defp package do [ - description: "An extensible BEAM-native codec framework for Elixir", + description: + "An extensible BEAM-native codec framework for Elixir — compression and spatial formats", licenses: ["Apache-2.0"], links: %{ "GitHub" => @source_url, diff --git a/native/ex_codecs_native/Cargo.toml b/native/ex_codecs_native/Cargo.toml index fe86b56..b3b191a 100644 --- a/native/ex_codecs_native/Cargo.toml +++ b/native/ex_codecs_native/Cargo.toml @@ -1,6 +1,6 @@ [package] name = "ex_codecs_native" -version = "0.1.0" +version = "0.2.0" authors = ["ExCodecs Team"] edition = "2021" rust-version = "1.85" @@ -12,10 +12,15 @@ crate-type = ["cdylib"] [dependencies] rustler = { version = "0.36", default-features = false, features = ["derive"] } -zstd = "0.13" +# Pure-Rust codecs only — no C compression toolchain (no cmake/c-blosc2). +ruzstd = "0.8" lz4_flex = "0.11" snap = "1.1" -bzip2 = "0.4" +flate2 = { version = "1", default-features = false, features = ["rust_backend"] } +# bzip2 0.6 defaults to pure-Rust libbz2-rs-sys (no C libbzip2). +bzip2 = "0.6" +# Official Blosc2 chunk format (BloscLZ, LZ4, LZ4HC, Zlib, Zstd + filters). +blosc2-pure-rs = { version = "0.2.4", default-features = false, features = ["zlib-rs"] } [features] default = ["nif_version_2_17"] @@ -25,4 +30,4 @@ nif_version_2_17 = ["rustler/nif_version_2_17"] opt-level = 3 lto = true codegen-units = 1 -strip = true \ No newline at end of file +strip = true diff --git a/native/ex_codecs_native/src/blosc2_codec.rs b/native/ex_codecs_native/src/blosc2_codec.rs index 52deb90..36e5601 100644 --- a/native/ex_codecs_native/src/blosc2_codec.rs +++ b/native/ex_codecs_native/src/blosc2_codec.rs @@ -1,182 +1,42 @@ -use rustler::{Binary, Encoder, Env, Term}; +//! C-Blosc2-compatible chunk compress/decompress (pure Rust). +//! +//! Uses [`blosc2_pure_rs`] for the official chunk wire format (header, blocks, +//! filters, codecs including BloscLZ and LZ4HC). No C-Blosc2 is linked. -use crate::atoms; -use crate::util::encode_binary; - -pub fn version() -> String { - "2.x-pure-rust".to_string() -} - -const BLOSC2_MAGIC: u8 = 0x2c; -const BLOSC2_VERSION: u8 = 2; -const BLOSC_MIN_HEADER_LENGTH: usize = 16; - -const BLOSC_BLOSCLZ: u8 = 0; -const BLOSC_LZ4: u8 = 1; -const BLOSC_LZ4HC: u8 = 2; -const BLOSC_SNAPPY: u8 = 3; -const BLOSC_ZLIB: u8 = 4; -const BLOSC_ZSTD: u8 = 5; - -const BLOSC_NOSHUFFLE: u8 = 0; -const BLOSC_BYTESHUFFLE: u8 = 1; -const BLOSC_BITSHUFFLE: u8 = 2; - -fn byte_shuffle(data: &[u8], typesize: usize) -> Vec { - if typesize <= 1 || data.len() < typesize { - return data.to_vec(); - } - - let n_elements = data.len() / typesize; - let mut result = vec![0u8; data.len()]; - - for i in 0..n_elements { - for j in 0..typesize { - result[j * n_elements + i] = data[i * typesize + j]; - } - } - - let offset = n_elements * typesize; - if offset < data.len() { - result[offset..].copy_from_slice(&data[offset..]); - } - - result -} - -fn byte_unshuffle(data: &[u8], typesize: usize) -> Vec { - if typesize <= 1 || data.len() < typesize { - return data.to_vec(); - } - - let n_elements = data.len() / typesize; - let mut result = vec![0u8; data.len()]; - - for i in 0..n_elements { - for j in 0..typesize { - result[i * typesize + j] = data[j * n_elements + i]; - } - } - - let offset = n_elements * typesize; - if offset < data.len() { - result[offset..].copy_from_slice(&data[offset..]); - } - - result -} - -fn bit_shuffle(data: &[u8], typesize: usize) -> Vec { - if typesize == 0 || data.is_empty() { - return data.to_vec(); - } - - let n_elements = data.len() / typesize; - if n_elements == 0 { - return data.to_vec(); - } - - let n_full_blocks = n_elements / 8; - let block_bytes = n_full_blocks * 8 * typesize; - let mut result = vec![0u8; data.len()]; - let mut out_pos = 0; - - for block in 0..n_full_blocks { - let block_start = block * 8; - for byte_idx in 0..typesize { - for bit_idx in 0..8 { - let mut acc: u8 = 0; - for i in 0..8 { - let src = data[(block_start + i) * typesize + byte_idx]; - if src & (1 << (7 - bit_idx)) != 0 { - acc |= 1 << (7 - i); - } - } - result[out_pos] = acc; - out_pos += 1; - } - } - } - - if block_bytes < data.len() { - result[block_bytes..data.len()].copy_from_slice(&data[block_bytes..data.len()]); - } +use rustler::{Binary, Env, Term}; - result -} - -fn bit_unshuffle(data: &[u8], typesize: usize) -> Vec { - if typesize == 0 || data.is_empty() { - return data.to_vec(); - } - - let n_elements = data.len() / typesize; - if n_elements == 0 { - return data.to_vec(); - } +use crate::atoms; +use crate::util::{err, ok_binary}; - let n_full_blocks = n_elements / 8; - let block_bytes = n_full_blocks * 8 * typesize; - let mut result = vec![0u8; data.len()]; - let mut in_pos = 0; +use blosc2_pure_rs::{ + blosc2_compress_ctx, blosc2_create_cctx, blosc2_create_dctx, blosc2_decompress_ctx, + blosc2_free_ctx, blosc2_get_version_string, CParams, DParams, BLOSC2_MAX_OVERHEAD, + BLOSC_BITSHUFFLE, BLOSC_BLOSCLZ, BLOSC_LZ4, BLOSC_LZ4HC, BLOSC_NOSHUFFLE, BLOSC_SHUFFLE, + BLOSC_ZLIB, BLOSC_ZSTD, +}; - for block in 0..n_full_blocks { - let block_start = block * 8; - for byte_idx in 0..typesize { - let mut transposed = [0u8; 8]; - for k in 0..8 { - transposed[k] = data[in_pos]; - in_pos += 1; - } - for i in 0..8 { - let mut byte_val: u8 = 0; - for bit_idx in 0..8 { - if transposed[bit_idx] & (1 << (7 - i)) != 0 { - byte_val |= 1 << (7 - bit_idx); - } - } - result[(block_start + i) * typesize + byte_idx] = byte_val; - } - } - } - - if block_bytes < data.len() { - result[block_bytes..data.len()].copy_from_slice(&data[block_bytes..data.len()]); - } - - result +pub fn version() -> String { + format!("c-blosc2-chunk/{}", blosc2_get_version_string()) } -fn internal_compress(data: &[u8], cname: u8, clevel: u8) -> Result, ()> { - match cname { - BLOSC_BLOSCLZ | BLOSC_LZ4 | BLOSC_LZ4HC => Ok(lz4_flex::compress_prepend_size(data)), - BLOSC_SNAPPY => { - let mut encoder = snap::raw::Encoder::new(); - encoder.compress_vec(data).map_err(|_| ()) - } - BLOSC_ZSTD => { - let level = (clevel as i32).clamp(1, 22); - zstd::bulk::compress(data, level).map_err(|_| ()) - } - BLOSC_ZLIB => Ok(lz4_flex::compress_prepend_size(data)), - _ => Err(()), +fn filter_from_shuffle(shuffle: u8) -> u8 { + match shuffle { + 0 => BLOSC_NOSHUFFLE, + 1 => BLOSC_SHUFFLE, + 2 => BLOSC_BITSHUFFLE, + _ => BLOSC_NOSHUFFLE, } } -fn internal_decompress(data: &[u8], cname: u8, _nbytes: usize) -> Result, ()> { +fn compcode_from_cname(cname: u8) -> Option { match cname { - BLOSC_BLOSCLZ | BLOSC_LZ4 | BLOSC_LZ4HC => { - lz4_flex::decompress_size_prepended(data).map_err(|_| ()) - } - BLOSC_SNAPPY => { - let mut decoder = snap::raw::Decoder::new(); - decoder.decompress_vec(data).map_err(|_| ()) - } - BLOSC_ZSTD => zstd::decode_all(data).map_err(|_| ()), - BLOSC_ZLIB => { - lz4_flex::decompress_size_prepended(data).map_err(|_| ()) - } - _ => Err(()), + 0 => Some(BLOSC_BLOSCLZ), + 1 => Some(BLOSC_LZ4), + 2 => Some(BLOSC_LZ4HC), + 4 => Some(BLOSC_ZLIB), + 5 => Some(BLOSC_ZSTD), + // 3 was historical snappy; not a standard C-Blosc2 compressor id path here + _ => None, } } @@ -190,134 +50,101 @@ pub fn blosc2_compress<'a>( typesize: usize, ) -> Term<'a> { let clevel = clevel.clamp(0, 9) as u8; - let typesize = typesize.max(1); - let cname = cname.clamp(0, 5) as u8; - let shuffle = shuffle.clamp(0, 2) as u8; - - if data.len() > u32::MAX as usize { - return (atoms::error(), atoms::invalid_data()).encode(env); - } - - if data.is_empty() { - let mut header = vec![0u8; BLOSC_MIN_HEADER_LENGTH]; - header[0] = BLOSC2_MAGIC; - header[1] = BLOSC2_VERSION; - header[2] = 0x01; - header[3] = 0; - header[4..8].copy_from_slice(&0u32.to_le_bytes()); - header[8..12].copy_from_slice(&(BLOSC_MIN_HEADER_LENGTH as u32).to_le_bytes()); - header[12] = cname; - header[13] = clevel; - header[14] = BLOSC_NOSHUFFLE; - header[15] = typesize.max(1) as u8; - return (atoms::ok(), encode_binary(env, &header)).encode(env); - } - - let shuffled = match shuffle { - BLOSC_BYTESHUFFLE => byte_shuffle(data.as_slice(), typesize), - BLOSC_BITSHUFFLE => bit_shuffle(data.as_slice(), typesize), - _ => data.as_slice().to_vec(), + let typesize = typesize.clamp(1, 255) as i32; + let Some(compcode) = compcode_from_cname(cname as u8) else { + return err(env, atoms::invalid_options()); }; + let filter = filter_from_shuffle(shuffle.clamp(0, 2) as u8); - if clevel == 0 { - let payload = data.as_slice(); - let total_len = BLOSC_MIN_HEADER_LENGTH + payload.len(); - let mut output = vec![0u8; total_len]; - output[0] = BLOSC2_MAGIC; - output[1] = BLOSC2_VERSION; - output[2] = 0x01; - output[3] = 0; - output[4..8].copy_from_slice(&(payload.len() as u32).to_le_bytes()); - output[8..12].copy_from_slice(&(total_len as u32).to_le_bytes()); - output[12] = 0; - output[13] = 0; - output[14] = BLOSC_NOSHUFFLE; - output[15] = typesize.max(1) as u8; - output[BLOSC_MIN_HEADER_LENGTH..].copy_from_slice(payload); - return (atoms::ok(), encode_binary(env, &output)).encode(env); + if data.len() > i32::MAX as usize { + return err(env, atoms::invalid_data()); } - let compressed = match internal_compress(&shuffled, cname, clevel) { - Ok(c) => c, - Err(()) => return (atoms::error(), atoms::compression_failed()).encode(env), + let mut cparams = CParams::default(); + cparams.compcode = compcode; + cparams.clevel = clevel; + cparams.typesize = typesize; + cparams.nthreads = 1; + cparams.filters = [0, 0, 0, 0, 0, filter]; + cparams.filters_meta = [0; 6]; + + let ctx = match blosc2_create_cctx(cparams) { + Ok(ctx) => ctx, + Err(_) => return err(env, atoms::invalid_options()), }; - if compressed.len() >= shuffled.len() { - let payload = data.as_slice(); - let total_len = BLOSC_MIN_HEADER_LENGTH + payload.len(); - let mut output = vec![0u8; total_len]; - output[0] = BLOSC2_MAGIC; - output[1] = BLOSC2_VERSION; - output[2] = 0x01; - output[3] = 0; - output[4..8].copy_from_slice(&(payload.len() as u32).to_le_bytes()); - output[8..12].copy_from_slice(&(total_len as u32).to_le_bytes()); - output[12] = 0; - output[13] = 0; - output[14] = BLOSC_NOSHUFFLE; - output[15] = typesize.max(1) as u8; - output[BLOSC_MIN_HEADER_LENGTH..].copy_from_slice(payload); - return (atoms::ok(), encode_binary(env, &output)).encode(env); + let src = data.as_slice(); + let srcsize = src.len() as i32; + let mut destsize = (src.len() + BLOSC2_MAX_OVERHEAD) as i32; + if destsize < BLOSC2_MAX_OVERHEAD as i32 { + destsize = BLOSC2_MAX_OVERHEAD as i32; + } + let mut dest = vec![0u8; destsize as usize]; + + let n = blosc2_compress_ctx(&ctx, src, srcsize, &mut dest, destsize); + blosc2_free_ctx(ctx); + + if n < 0 { + return err(env, atoms::compression_failed()); + } + if n == 0 { + // Destination too small — retry with a larger buffer. + let destsize2 = ((src.len() * 2) + BLOSC2_MAX_OVERHEAD).max(BLOSC2_MAX_OVERHEAD) as i32; + let mut dest2 = vec![0u8; destsize2 as usize]; + let mut cparams2 = CParams::default(); + cparams2.compcode = compcode; + cparams2.clevel = clevel; + cparams2.typesize = typesize; + cparams2.nthreads = 1; + cparams2.filters = [0, 0, 0, 0, 0, filter]; + let Ok(ctx2) = blosc2_create_cctx(cparams2) else { + return err(env, atoms::compression_failed()); + }; + let n2 = blosc2_compress_ctx(&ctx2, src, srcsize, &mut dest2, destsize2); + blosc2_free_ctx(ctx2); + if n2 <= 0 { + return err(env, atoms::compression_failed()); + } + dest2.truncate(n2 as usize); + return ok_binary(env, &dest2); } - let total_len = BLOSC_MIN_HEADER_LENGTH + compressed.len(); - let mut output = vec![0u8; total_len]; - output[0] = BLOSC2_MAGIC; - output[1] = BLOSC2_VERSION; - output[2] = 0x00; - output[3] = 0; - output[4..8].copy_from_slice(&(data.len() as u32).to_le_bytes()); - output[8..12].copy_from_slice(&(total_len as u32).to_le_bytes()); - output[12] = cname; - output[13] = clevel; - output[14] = shuffle; - output[15] = typesize.max(1) as u8; - output[BLOSC_MIN_HEADER_LENGTH..].copy_from_slice(&compressed); - - (atoms::ok(), encode_binary(env, &output)).encode(env) + dest.truncate(n as usize); + ok_binary(env, &dest) } #[rustler::nif(schedule = "DirtyCpu")] pub fn blosc2_decompress<'a>(env: Env<'a>, data: Binary) -> Term<'a> { - if data.len() < BLOSC_MIN_HEADER_LENGTH { - return (atoms::error(), atoms::invalid_data()).encode(env); - } - - if data[0] != BLOSC2_MAGIC { - return (atoms::error(), atoms::invalid_data()).encode(env); + if data.len() < 16 { + return err(env, atoms::invalid_data()); } + // nbytes at offset 4 (little-endian int32) in the Blosc chunk header. let nbytes = u32::from_le_bytes([data[4], data[5], data[6], data[7]]) as usize; - let cbytes = u32::from_le_bytes([data[8], data[9], data[10], data[11]]) as usize; - let flags = data[2]; - let cname = data[12]; - let _clevel = data[13]; - let shuffle = data[14]; - let typesize = data[15] as usize; - - if cbytes > data.len() { - return (atoms::error(), atoms::invalid_data()).encode(env); + // Cap single-chunk decompress to 1 GiB. + if nbytes > (1usize << 30) { + return err(env, atoms::invalid_data()); } - if flags & 0x01 != 0 { - if BLOSC_MIN_HEADER_LENGTH + nbytes > data.len() { - return (atoms::error(), atoms::invalid_data()).encode(env); - } - let result = data[BLOSC_MIN_HEADER_LENGTH..BLOSC_MIN_HEADER_LENGTH + nbytes].to_vec(); - return (atoms::ok(), encode_binary(env, &result)).encode(env); - } - - let payload = &data[BLOSC_MIN_HEADER_LENGTH..cbytes]; - let decompressed = match internal_decompress(payload, cname, nbytes) { - Ok(d) => d, - Err(()) => return (atoms::error(), atoms::decompression_failed()).encode(env), + let mut dparams = DParams::default(); + dparams.nthreads = 1; + let ctx = match blosc2_create_dctx(dparams) { + Ok(ctx) => ctx, + Err(_) => return err(env, atoms::decompression_failed()), }; - let result = match shuffle { - BLOSC_BYTESHUFFLE => byte_unshuffle(&decompressed, typesize), - BLOSC_BITSHUFFLE => bit_unshuffle(&decompressed, typesize), - _ => decompressed, - }; + let src = data.as_slice(); + let srcsize = src.len() as i32; + let mut dest = vec![0u8; nbytes.max(1)]; + let destsize = dest.len() as i32; - (atoms::ok(), encode_binary(env, &result)).encode(env) -} \ No newline at end of file + let n = blosc2_decompress_ctx(&ctx, src, srcsize, &mut dest, destsize); + blosc2_free_ctx(ctx); + + if n < 0 { + return err(env, atoms::decompression_failed()); + } + + dest.truncate(n as usize); + ok_binary(env, &dest) +} diff --git a/native/ex_codecs_native/src/bzip2_codec.rs b/native/ex_codecs_native/src/bzip2_codec.rs index 48d45ee..e48c1cd 100644 --- a/native/ex_codecs_native/src/bzip2_codec.rs +++ b/native/ex_codecs_native/src/bzip2_codec.rs @@ -1,11 +1,11 @@ -use rustler::{Binary, Encoder, Env, Term}; +use rustler::{Binary, Env, Term}; use std::io::{Read, Write}; use crate::atoms; -use crate::util::encode_binary; +use crate::util::{err, ok_binary}; pub fn version() -> String { - "0.4.x".to_string() + "bzip2-0.6/libbz2-rs".to_string() } #[rustler::nif(schedule = "DirtyCpu")] @@ -15,10 +15,8 @@ pub fn bzip2_compress<'a>(env: Env<'a>, data: Binary, block_size: u32) -> Term<' let result: Result, std::io::Error> = (|| { let mut compressed = Vec::with_capacity(data.len() / 2); { - let mut writer = bzip2::write::BzEncoder::new( - &mut compressed, - bzip2::Compression::new(block_size), - ); + let mut writer = + bzip2::write::BzEncoder::new(&mut compressed, bzip2::Compression::new(block_size)); writer.write_all(data.as_slice())?; writer.finish()?; } @@ -26,8 +24,8 @@ pub fn bzip2_compress<'a>(env: Env<'a>, data: Binary, block_size: u32) -> Term<' })(); match result { - Ok(compressed) => (atoms::ok(), encode_binary(env, &compressed)).encode(env), - Err(_) => (atoms::error(), atoms::compression_failed()).encode(env), + Ok(compressed) => ok_binary(env, &compressed), + Err(_) => err(env, atoms::compression_failed()), } } @@ -43,7 +41,7 @@ pub fn bzip2_decompress<'a>(env: Env<'a>, data: Binary) -> Term<'a> { })(); match result { - Ok(decompressed) => (atoms::ok(), encode_binary(env, &decompressed)).encode(env), - Err(_) => (atoms::error(), atoms::decompression_failed()).encode(env), + Ok(decompressed) => ok_binary(env, &decompressed), + Err(_) => err(env, atoms::decompression_failed()), } -} \ No newline at end of file +} diff --git a/native/ex_codecs_native/src/lib.rs b/native/ex_codecs_native/src/lib.rs index b57b8a7..a1e6118 100644 --- a/native/ex_codecs_native/src/lib.rs +++ b/native/ex_codecs_native/src/lib.rs @@ -17,4 +17,4 @@ fn codec_versions() -> std::collections::HashMap<&'static str, String> { versions.insert("bzip2", bzip2_codec::version()); versions.insert("blosc2", blosc2_codec::version()); versions -} \ No newline at end of file +} diff --git a/native/ex_codecs_native/src/lz4_codec.rs b/native/ex_codecs_native/src/lz4_codec.rs index b02f9b0..fa67a48 100644 --- a/native/ex_codecs_native/src/lz4_codec.rs +++ b/native/ex_codecs_native/src/lz4_codec.rs @@ -1,23 +1,22 @@ -use rustler::{Binary, Encoder, Env, Term}; +use rustler::{Binary, Env, Term}; use crate::atoms; -use crate::util::encode_binary; +use crate::util::{err, ok_binary}; pub fn version() -> String { - "1.10.x".to_string() + "lz4_flex-0.11".to_string() } #[rustler::nif(schedule = "DirtyCpu")] pub fn lz4_compress<'a>(env: Env<'a>, data: Binary) -> Term<'a> { let compressed = lz4_flex::compress_prepend_size(data.as_slice()); - - (atoms::ok(), encode_binary(env, &compressed)).encode(env) + ok_binary(env, &compressed) } #[rustler::nif(schedule = "DirtyCpu")] pub fn lz4_decompress<'a>(env: Env<'a>, data: Binary) -> Term<'a> { match lz4_flex::decompress_size_prepended(data.as_slice()) { - Ok(decompressed) => (atoms::ok(), encode_binary(env, &decompressed)).encode(env), - Err(_) => (atoms::error(), atoms::decompression_failed()).encode(env), + Ok(decompressed) => ok_binary(env, &decompressed), + Err(_) => err(env, atoms::decompression_failed()), } -} \ No newline at end of file +} diff --git a/native/ex_codecs_native/src/snappy_codec.rs b/native/ex_codecs_native/src/snappy_codec.rs index 687d3ab..4f8100c 100644 --- a/native/ex_codecs_native/src/snappy_codec.rs +++ b/native/ex_codecs_native/src/snappy_codec.rs @@ -1,18 +1,18 @@ -use rustler::{Binary, Encoder, Env, Term}; +use rustler::{Binary, Env, Term}; use crate::atoms; -use crate::util::encode_binary; +use crate::util::{err, ok_binary}; pub fn version() -> String { - "1.1.x".to_string() + "snap-1.1".to_string() } #[rustler::nif(schedule = "DirtyCpu")] pub fn snappy_compress<'a>(env: Env<'a>, data: Binary) -> Term<'a> { let mut encoder = snap::raw::Encoder::new(); match encoder.compress_vec(data.as_slice()) { - Ok(compressed) => (atoms::ok(), encode_binary(env, &compressed)).encode(env), - Err(_) => (atoms::error(), atoms::compression_failed()).encode(env), + Ok(compressed) => ok_binary(env, &compressed), + Err(_) => err(env, atoms::compression_failed()), } } @@ -20,7 +20,7 @@ pub fn snappy_compress<'a>(env: Env<'a>, data: Binary) -> Term<'a> { pub fn snappy_decompress<'a>(env: Env<'a>, data: Binary) -> Term<'a> { let mut decoder = snap::raw::Decoder::new(); match decoder.decompress_vec(data.as_slice()) { - Ok(decompressed) => (atoms::ok(), encode_binary(env, &decompressed)).encode(env), - Err(_) => (atoms::error(), atoms::decompression_failed()).encode(env), + Ok(decompressed) => ok_binary(env, &decompressed), + Err(_) => err(env, atoms::decompression_failed()), } -} \ No newline at end of file +} diff --git a/native/ex_codecs_native/src/util.rs b/native/ex_codecs_native/src/util.rs index fd12713..4eab0e7 100644 --- a/native/ex_codecs_native/src/util.rs +++ b/native/ex_codecs_native/src/util.rs @@ -2,12 +2,28 @@ use rustler::{Binary, Encoder, Env, OwnedBinary, Term}; use crate::atoms; -pub fn encode_binary<'a>(env: Env<'a>, data: &[u8]) -> Term<'a> { +/// Copy bytes into an Erlang binary term. +/// +/// Returns `Ok(binary_term)` or `Err` when allocation fails so callers never +/// nest `{:ok, {:error, _}}`. +pub fn encode_binary<'a>(env: Env<'a>, data: &[u8]) -> Result, ()> { match OwnedBinary::new(data.len()) { Some(mut owned) => { owned.as_mut_slice().copy_from_slice(data); - Binary::from_owned(owned, env).encode(env) + Ok(Binary::from_owned(owned, env).encode(env)) } - None => (atoms::error(), atoms::invalid_data()).encode(env), + None => Err(()), } -} \ No newline at end of file +} + +/// Encode `{:ok, binary}` or `{:error, reason}` for NIF returns. +pub fn ok_binary<'a>(env: Env<'a>, data: &[u8]) -> Term<'a> { + match encode_binary(env, data) { + Ok(bin) => (atoms::ok(), bin).encode(env), + Err(()) => (atoms::error(), atoms::invalid_data()).encode(env), + } +} + +pub fn err<'a>(env: Env<'a>, reason: rustler::types::atom::Atom) -> Term<'a> { + (atoms::error(), reason).encode(env) +} diff --git a/native/ex_codecs_native/src/zstd_codec.rs b/native/ex_codecs_native/src/zstd_codec.rs index 480cb74..f1228d0 100644 --- a/native/ex_codecs_native/src/zstd_codec.rs +++ b/native/ex_codecs_native/src/zstd_codec.rs @@ -1,26 +1,40 @@ -use rustler::{Binary, Encoder, Env, Term}; +use rustler::{Binary, Env, Term}; +use std::io::Read; use crate::atoms; -use crate::util::encode_binary; +use crate::util::{err, ok_binary}; pub fn version() -> String { - "1.5.x".to_string() + "ruzstd-0.8".to_string() +} + +fn compression_level(level: i32) -> ruzstd::encoding::CompressionLevel { + // ruzstd only fully implements Fastest today; map all positive levels there + // and keep Uncompressed for level 0 edge cases (Elixir validates 1..=22). + match level { + i if i <= 0 => ruzstd::encoding::CompressionLevel::Uncompressed, + _ => ruzstd::encoding::CompressionLevel::Fastest, + } } #[rustler::nif(schedule = "DirtyCpu")] pub fn zstd_compress<'a>(env: Env<'a>, data: Binary, level: i32) -> Term<'a> { let level = level.clamp(1, 22); - - match zstd::bulk::compress(data.as_slice(), level) { - Ok(compressed) => (atoms::ok(), encode_binary(env, &compressed)).encode(env), - Err(_) => (atoms::error(), atoms::compression_failed()).encode(env), - } + let compressed = + ruzstd::encoding::compress_to_vec(data.as_slice(), compression_level(level)); + ok_binary(env, &compressed) } #[rustler::nif(schedule = "DirtyCpu")] pub fn zstd_decompress<'a>(env: Env<'a>, data: Binary) -> Term<'a> { - match zstd::decode_all(data.as_slice()) { - Ok(decompressed) => (atoms::ok(), encode_binary(env, &decompressed)).encode(env), - Err(_) => (atoms::error(), atoms::decompression_failed()).encode(env), + match ruzstd::decoding::StreamingDecoder::new(data.as_slice()) { + Ok(mut decoder) => { + let mut out = Vec::new(); + match decoder.read_to_end(&mut out) { + Ok(_) => ok_binary(env, &out), + Err(_) => err(env, atoms::decompression_failed()), + } + } + Err(_) => err(env, atoms::decompression_failed()), } -} \ No newline at end of file +} diff --git a/priv/examples/spatial/cube_corners.ply b/priv/examples/spatial/cube_corners.ply new file mode 100644 index 0000000..45f3d29 --- /dev/null +++ b/priv/examples/spatial/cube_corners.ply @@ -0,0 +1,15 @@ +ply +format ascii 1.0 +comment ex_codecs example point cloud +element vertex 4 +property float x +property float y +property float z +property uchar red +property uchar green +property uchar blue +end_header +0.0 0.0 0.0 255 0 0 +1.0 0.0 0.0 0 255 0 +0.0 1.0 0.0 0 0 255 +0.0 0.0 1.0 255 255 0 diff --git a/priv/examples/spatial/two_gaussians.ply b/priv/examples/spatial/two_gaussians.ply new file mode 100644 index 0000000..b09a514 --- /dev/null +++ b/priv/examples/spatial/two_gaussians.ply @@ -0,0 +1,21 @@ +ply +format ascii 1.0 +comment ex_codecs example gaussian splat +element vertex 2 +property float x +property float y +property float z +property float f_dc_0 +property float f_dc_1 +property float f_dc_2 +property float opacity +property float scale_0 +property float scale_1 +property float scale_2 +property float rot_0 +property float rot_1 +property float rot_2 +property float rot_3 +end_header +0.0 0.0 0.0 0.5 0.4 0.3 0.9 0.1 0.1 0.1 1.0 0.0 0.0 0.0 +1.0 1.0 1.0 0.2 0.6 0.8 0.7 0.2 0.2 0.2 0.9 0.1 0.0 0.0 diff --git a/test/ex_codecs/codec_registry_test.exs b/test/ex_codecs/codec_registry_test.exs index c210769..f1c2e15 100644 --- a/test/ex_codecs/codec_registry_test.exs +++ b/test/ex_codecs/codec_registry_test.exs @@ -4,69 +4,76 @@ defmodule ExCodecs.CodecRegistryTest do alias ExCodecs.CodecRegistry setup do - CodecRegistry.start_link([]) - :ok + # Use the application-owned registry; clean up any names we register. + names = + for i <- 1..20 do + :"registry_test_#{System.unique_integer([:positive])}_#{i}" + end + + on_exit(fn -> + Enum.each(names, &CodecRegistry.unregister/1) + end) + + {:ok, names: names} end describe "register/3" do - test "registers a valid codec module" do - assert :ok = CodecRegistry.register(:zstd, ExCodecs.Compression.Zstd, :compression) - assert {:ok, {ExCodecs.Compression.Zstd, :compression, _}} = CodecRegistry.lookup(:zstd) + test "registers a valid codec module", %{names: [name | _]} do + assert :ok = CodecRegistry.register(name, ExCodecs.Compression.Zstd, :compression) + assert {:ok, {ExCodecs.Compression.Zstd, :compression, _}} = CodecRegistry.lookup(name) end - test "returns error for invalid module" do + test "returns error for invalid module", %{names: [name | _]} do assert {:error, {:invalid_codec_module, NonexistentModule}} = - CodecRegistry.register(:fake, NonexistentModule, :compression) + CodecRegistry.register(name, NonexistentModule, :compression) end - test "returns error for module missing encode/2" do + test "returns error for module missing encode/2", %{names: [name | _]} do defmodule NoEncode do def decode(_data, _opts), do: {:ok, ""} end assert {:error, {:invalid_codec_module, NoEncode}} = - CodecRegistry.register(:no_encode, NoEncode, :compression) + CodecRegistry.register(name, NoEncode, :compression) end - test "returns error for module missing decode/2" do + test "returns error for module missing decode/2", %{names: [name | _]} do defmodule NoDecode do def encode(_data, _opts), do: {:ok, ""} end assert {:error, {:invalid_codec_module, NoDecode}} = - CodecRegistry.register(:no_decode, NoDecode, :compression) + CodecRegistry.register(name, NoDecode, :compression) end end describe "register_unavailable/2" do - test "registers codec as unavailable" do - assert :ok = CodecRegistry.register_unavailable(:future_codec, :compression) - assert {:ok, {nil, :compression, info}} = CodecRegistry.lookup(:future_codec) + test "registers codec as unavailable", %{names: [name | _]} do + assert :ok = CodecRegistry.register_unavailable(name, :compression) + assert {:ok, {nil, :compression, info}} = CodecRegistry.lookup(name) assert info.module == nil assert info.native? == false end - test "unavailable codec is not in available_codecs" do - CodecRegistry.register_unavailable(:unavail, :compression) - refute :unavail in CodecRegistry.available_codecs() + test "unavailable codec is not in available_codecs", %{names: [name | _]} do + CodecRegistry.register_unavailable(name, :compression) + refute name in CodecRegistry.available_codecs() end - test "unavailable codec shows in all_codecs" do - CodecRegistry.register_unavailable(:unavail, :compression) - assert :unavail in CodecRegistry.all_codecs() + test "unavailable codec shows in all_codecs", %{names: [name | _]} do + CodecRegistry.register_unavailable(name, :compression) + assert name in CodecRegistry.all_codecs() end end describe "lookup/1" do test "returns error for unknown codec" do - assert {:error, :unsupported_codec} = CodecRegistry.lookup(:nonexistent) + assert {:error, :unsupported_codec} = CodecRegistry.lookup(:nonexistent_codec_xyz) end end describe "available_codecs/0" do - test "returns list of available codec names" do - CodecRegistry.register(:zstd, ExCodecs.Compression.Zstd, :compression) - CodecRegistry.register(:lz4, ExCodecs.Compression.Lz4, :compression) + test "includes built-in codecs from application start" do codecs = CodecRegistry.available_codecs() assert :zstd in codecs assert :lz4 in codecs @@ -74,34 +81,31 @@ defmodule ExCodecs.CodecRegistryTest do end describe "all_codecs/0" do - test "returns all codecs including unavailable" do - CodecRegistry.register(:zstd, ExCodecs.Compression.Zstd, :compression) - CodecRegistry.register_unavailable(:future_codec, :compression) + test "returns all codecs including unavailable", %{names: [name | _]} do + CodecRegistry.register_unavailable(name, :compression) all = CodecRegistry.all_codecs() assert :zstd in all - assert :future_codec in all + assert name in all end end describe "supports?/1" do test "returns true for available codecs" do - CodecRegistry.register(:zstd, ExCodecs.Compression.Zstd, :compression) assert CodecRegistry.supports?(:zstd) == true end - test "returns false for unavailable codecs" do - CodecRegistry.register_unavailable(:future_codec, :compression) - assert CodecRegistry.supports?(:future_codec) == false + test "returns false for unavailable codecs", %{names: [name | _]} do + CodecRegistry.register_unavailable(name, :compression) + assert CodecRegistry.supports?(name) == false end test "returns false for unknown codecs" do - assert CodecRegistry.supports?(:nonexistent) == false + assert CodecRegistry.supports?(:nonexistent_codec_xyz) == false end end describe "codec_info/1" do test "returns info for registered codec" do - CodecRegistry.register(:zstd, ExCodecs.Compression.Zstd, :compression) assert {:ok, info} = CodecRegistry.codec_info(:zstd) assert info.name == :zstd assert info.category == :compression @@ -109,14 +113,12 @@ defmodule ExCodecs.CodecRegistryTest do end test "returns error for unknown codec" do - assert {:error, :unsupported_codec} = CodecRegistry.codec_info(:nonexistent) + assert {:error, :unsupported_codec} = CodecRegistry.codec_info(:nonexistent_codec_xyz) end end describe "codecs_by_category/1" do test "returns codecs in a category" do - CodecRegistry.register(:zstd, ExCodecs.Compression.Zstd, :compression) - CodecRegistry.register(:lz4, ExCodecs.Compression.Lz4, :compression) codecs = CodecRegistry.codecs_by_category(:compression) assert length(codecs) >= 2 names = Enum.map(codecs, & &1.name) @@ -125,7 +127,15 @@ defmodule ExCodecs.CodecRegistryTest do end test "returns empty list for unknown category" do - assert [] = CodecRegistry.codecs_by_category(:nonexistent) + assert [] = CodecRegistry.codecs_by_category(:nonexistent_category_xyz) + end + end + + describe "unregister/1" do + test "removes a codec entry", %{names: [name | _]} do + assert :ok = CodecRegistry.register_unavailable(name, :compression) + assert :ok = CodecRegistry.unregister(name) + assert {:error, :unsupported_codec} = CodecRegistry.lookup(name) end end end diff --git a/test/ex_codecs/compression/blosc2_interop_test.exs b/test/ex_codecs/compression/blosc2_interop_test.exs new file mode 100644 index 0000000..a0b373d --- /dev/null +++ b/test/ex_codecs/compression/blosc2_interop_test.exs @@ -0,0 +1,62 @@ +defmodule ExCodecs.Compression.Blosc2InteropTest do + use ExUnit.Case, async: true + + @moduletag :blosc2_interop + + @fixture_dir Path.expand("../../fixtures/blosc2", __DIR__) + + @goldens [ + "lz4_noshuffle_t1.bin", + "lz4_shuffle_t8.bin", + "zstd_shuffle_t8.bin", + "blosclz_noshuffle.bin", + "lz4hc_noshuffle.bin", + "zlib_noshuffle.bin", + "lz4_bitshuffle_t8.bin" + ] + + describe "python-blosc2 golden chunks" do + for name <- @goldens do + test "decompresses #{name}" do + bin = File.read!(Path.join(@fixture_dir, unquote(name))) + src = File.read!(Path.join(@fixture_dir, String.replace(unquote(name), ".bin", ".src"))) + + assert {:ok, decompressed} = ExCodecs.decode(:blosc2, bin) + assert decompressed == src + end + end + end + + describe "round-trip all official cnames" do + test "blosclz lz4 lz4hc zlib zstd with filters" do + data = :crypto.strong_rand_bytes(4096) + floats = for i <- 1..512, into: <<>>, do: <> + + for cname <- [:blosclz, :lz4, :lz4hc, :zlib, :zstd] do + assert {:ok, c} = ExCodecs.encode(:blosc2, data, cname: cname, shuffle: :none, typesize: 1) + assert {:ok, ^data} = ExCodecs.decode(:blosc2, c) + end + + for {shuffle, typesize, payload} <- [ + {:byte, 8, floats}, + {:bit, 8, floats}, + {:none, 1, data} + ] do + assert {:ok, c} = + ExCodecs.encode(:blosc2, payload, + cname: :lz4, + clevel: 5, + shuffle: shuffle, + typesize: typesize + ) + + assert {:ok, ^payload} = ExCodecs.decode(:blosc2, c) + end + end + + test "rejects snappy" do + assert {:error, %ExCodecs.Error{reason: :invalid_options}} = + ExCodecs.encode(:blosc2, "x", cname: :snappy) + end + end +end diff --git a/test/ex_codecs/compression/blosc2_test.exs b/test/ex_codecs/compression/blosc2_test.exs index 740d860..49790d1 100644 --- a/test/ex_codecs/compression/blosc2_test.exs +++ b/test/ex_codecs/compression/blosc2_test.exs @@ -149,9 +149,35 @@ defmodule ExCodecs.Compression.Blosc2Test do assert info.name == :blosc2 assert info.category == :compression assert info.configurable? == true - assert info.streaming? == true + assert info.streaming? == false assert info.native? == true assert is_binary(info.version) end end + + describe "c-blosc2 cnames" do + test "accepts blosclz and lz4hc" do + data = :crypto.strong_rand_bytes(1024) + + assert {:ok, c} = Blosc2.encode(data, cname: :blosclz, shuffle: :none) + assert {:ok, ^data} = Blosc2.decode(c, []) + + assert {:ok, c} = Blosc2.encode(data, cname: :lz4hc, shuffle: :none) + assert {:ok, ^data} = Blosc2.decode(c, []) + end + + test "round-trips official cnames" do + data = :crypto.strong_rand_bytes(2048) + + for cname <- [:blosclz, :lz4, :lz4hc, :zlib, :zstd] do + assert {:ok, compressed} = Blosc2.encode(data, cname: cname, shuffle: :none, typesize: 1) + assert {:ok, ^data} = Blosc2.decode(compressed, []) + end + end + + test "rejects snappy" do + assert {:error, %ExCodecs.Error{reason: :invalid_options}} = + Blosc2.encode("data", cname: :snappy) + end + end end diff --git a/test/ex_codecs/compression/version_and_error_test.exs b/test/ex_codecs/compression/version_and_error_test.exs index 77bc1a9..32f67a5 100644 --- a/test/ex_codecs/compression/version_and_error_test.exs +++ b/test/ex_codecs/compression/version_and_error_test.exs @@ -11,7 +11,7 @@ defmodule ExCodecs.Compression.CodecVersionTest do assert info.category == :compression assert info.module == Zstd assert info.native? == true - assert info.streaming? == true + assert info.streaming? == false assert info.configurable? == true assert is_binary(info.version) end @@ -52,7 +52,7 @@ defmodule ExCodecs.Compression.CodecVersionTest do assert info.category == :compression assert info.module == Blosc2 assert info.native? == true - assert info.streaming? == true + assert info.streaming? == false assert info.configurable? == true assert is_binary(info.version) end @@ -80,8 +80,10 @@ defmodule ExCodecs.Compression.CodecVersionTest do end test "blosc2 returns error for invalid magic" do - assert {:error, %Error{reason: :invalid_data}} = + assert {:error, %Error{reason: reason}} = ExCodecs.decode(:blosc2, <<0xFF, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0>>) + + assert reason in [:invalid_data, :decompression_failed] end test "blosc2 validates cname option" do diff --git a/test/ex_codecs/compression/zstd_test.exs b/test/ex_codecs/compression/zstd_test.exs index 5ef78c3..36e7f1a 100644 --- a/test/ex_codecs/compression/zstd_test.exs +++ b/test/ex_codecs/compression/zstd_test.exs @@ -91,7 +91,7 @@ defmodule ExCodecs.Compression.ZstdTest do assert info.name == :zstd assert info.category == :compression assert info.native? == true - assert info.streaming? == true + assert info.streaming? == false assert info.configurable? == true end end diff --git a/test/ex_codecs/documentation_test.exs b/test/ex_codecs/documentation_test.exs new file mode 100644 index 0000000..c631844 --- /dev/null +++ b/test/ex_codecs/documentation_test.exs @@ -0,0 +1,108 @@ +defmodule ExCodecs.DocumentationTest do + use ExUnit.Case, async: true + + @documented_modules [ + ExCodecs, + ExCodecs.Application, + ExCodecs.Codec, + ExCodecs.CodecRegistry, + ExCodecs.Compression, + ExCodecs.Compression.Blosc2, + ExCodecs.Compression.Bzip2, + ExCodecs.Compression.Lz4, + ExCodecs.Compression.Snappy, + ExCodecs.Compression.Zstd, + ExCodecs.Error, + ExCodecs.Native, + ExCodecs.Spatial, + ExCodecs.Spatial.Bounds, + ExCodecs.Spatial.Codec.Binary, + ExCodecs.Spatial.Codec.Gsplat, + ExCodecs.Spatial.Codec.PLY, + ExCodecs.Spatial.Gaussian, + ExCodecs.Spatial.GaussianCloud, + ExCodecs.Spatial.Metadata, + ExCodecs.Spatial.Point, + ExCodecs.Spatial.PointCloud, + ExCodecs.Spatial.Stream, + ExCodecs.Spatial.Transform + ] + + @function_sections ["## Arguments", "## Returns", "## Raises", "## Example"] + + test "all visible public functions document their contract and an example" do + failures = + for module <- @documented_modules, + {{kind, name, arity}, annotation, _signature, doc, metadata} <- docs(module), + kind in [:function, :macro], + not generated?(annotation, metadata), + is_map(doc), + section <- @function_sections, + not String.contains?(doc["en"], section), + do: "#{inspect(module)}.#{name}/#{arity} is missing #{section}" + + assert failures == [], Enum.join(failures, "\n") + end + + test "all visible public types have descriptions and examples" do + failures = + for module <- @documented_modules, + {{:type, name, arity}, _line, _signature, doc, _metadata} <- docs(module), + do: type_doc_failure(module, name, arity, doc) + + failures = Enum.reject(failures, &is_nil/1) + assert failures == [], Enum.join(failures, "\n") + end + + test "all callbacks document a realistic implementation" do + failures = + for module <- @documented_modules, + {{kind, name, arity}, _line, _signature, doc, _metadata} <- docs(module), + kind in [:callback, :macrocallback], + do: callback_doc_failure(module, name, arity, doc) + + failures = Enum.reject(failures, &is_nil/1) + assert failures == [], Enum.join(failures, "\n") + end + + defp docs(module) do + case Code.fetch_docs(module) do + {:docs_v1, _, _, _, _, _, docs} -> docs + {:error, reason} -> flunk("Could not fetch docs for #{inspect(module)}: #{inspect(reason)}") + end + end + + defp generated?(annotation, metadata) do + annotation_generated? = + is_list(annotation) and Keyword.get(annotation, :generated, false) + + metadata_generated? = + (is_map(metadata) and Map.get(metadata, :generated, false)) or + (is_list(metadata) and Keyword.get(metadata, :generated, false)) + + annotation_generated? or metadata_generated? + end + + defp type_doc_failure(module, name, arity, doc) when not is_map(doc), + do: "#{inspect(module)}.#{name}/#{arity} has no @typedoc" + + defp type_doc_failure(module, name, arity, %{"en" => text}) do + if String.contains?(String.downcase(text), "example") do + nil + else + "#{inspect(module)}.#{name}/#{arity} is missing a realistic type example" + end + end + + defp callback_doc_failure(module, name, arity, doc) when not is_map(doc), + do: "#{inspect(module)}.#{name}/#{arity} has no callback documentation" + + defp callback_doc_failure(module, name, arity, %{"en" => text}) do + required = ["## Arguments", "## Returns", "## Raises", "implementation"] + + case Enum.find(required, &(not String.contains?(String.downcase(text), String.downcase(&1)))) do + nil -> nil + missing -> "#{inspect(module)}.#{name}/#{arity} callback is missing #{missing}" + end + end +end diff --git a/test/ex_codecs/spatial/bounds_test.exs b/test/ex_codecs/spatial/bounds_test.exs new file mode 100644 index 0000000..1c8c699 --- /dev/null +++ b/test/ex_codecs/spatial/bounds_test.exs @@ -0,0 +1,21 @@ +defmodule ExCodecs.Spatial.BoundsTest do + use ExUnit.Case, async: true + + alias ExCodecs.Spatial.{Bounds, Point} + + test "computes bounds from points" do + points = [Point.new(0, 0, 0), Point.new(2, 4, 6)] + bounds = Bounds.from_points(points) + + assert bounds.min_x == 0.0 + assert bounds.max_z == 6.0 + assert Bounds.center(bounds) == {1.0, 2.0, 3.0} + assert Bounds.size(bounds) == {2.0, 4.0, 6.0} + assert Bounds.contains?(bounds, {1.0, 1.0, 1.0}) + refute Bounds.contains?(bounds, {10.0, 0.0, 0.0}) + end + + test "empty enumerable yields nil" do + assert Bounds.from_points([]) == nil + end +end diff --git a/test/ex_codecs/spatial/codec/binary_test.exs b/test/ex_codecs/spatial/codec/binary_test.exs new file mode 100644 index 0000000..ba8fd96 --- /dev/null +++ b/test/ex_codecs/spatial/codec/binary_test.exs @@ -0,0 +1,33 @@ +defmodule ExCodecs.Spatial.Codec.BinaryTest do + use ExUnit.Case, async: true + + alias ExCodecs.Spatial.{Point, PointCloud} + alias ExCodecs.Spatial.Codec.Binary + + test "round-trips colored points with normals" do + cloud = + PointCloud.new([ + Point.new(1.0, 2.0, 3.0, color: {10, 20, 30}, normal: {0.0, 1.0, 0.0}), + Point.new(4.0, 5.0, 6.0, color: {40, 50, 60}, normal: {1.0, 0.0, 0.0}) + ]) + + assert {:ok, bin} = Binary.encode(cloud) + assert String.starts_with?(bin, "EXCP") + assert {:ok, decoded} = Binary.decode(bin) + assert length(decoded.points) == 2 + assert hd(decoded.points).color == {10, 20, 30} + assert hd(decoded.points).normal == {0.0, 1.0, 0.0} + end + + test "round-trips RGBA" do + cloud = PointCloud.new([Point.new(0, 0, 0, color: {1, 2, 3, 4})]) + assert {:ok, bin} = Binary.encode(cloud) + assert {:ok, decoded} = Binary.decode(bin) + assert hd(decoded.points).color == {1, 2, 3, 4} + end + + test "rejects bad magic" do + assert {:error, %{reason: :invalid_data}} = + Binary.decode(<<"XXXX", 0, 1, 0, 0, 0, 0, 0, 0, 0, 0>>) + end +end diff --git a/test/ex_codecs/spatial/codec/gsplat_test.exs b/test/ex_codecs/spatial/codec/gsplat_test.exs new file mode 100644 index 0000000..3b5ed69 --- /dev/null +++ b/test/ex_codecs/spatial/codec/gsplat_test.exs @@ -0,0 +1,41 @@ +defmodule ExCodecs.Spatial.Codec.GsplatTest do + use ExUnit.Case, async: true + + alias ExCodecs.Spatial.{Gaussian, GaussianCloud} + alias ExCodecs.Spatial.Codec.Gsplat + + test "round-trips Gaussians" do + cloud = + GaussianCloud.new([ + Gaussian.new({1.0, 2.0, 3.0}, + color: {0.1, 0.2, 0.3}, + opacity: 0.9, + scale: {0.2, 0.3, 0.4}, + rotation: {0.9, 0.1, 0.0, 0.0} + ) + ]) + + assert {:ok, bin} = Gsplat.encode(cloud) + assert String.starts_with?(bin, "GSPL") + assert {:ok, decoded} = Gsplat.decode(bin) + [g] = decoded.gaussians + assert_in_delta elem(g.position, 2), 3.0, 0.0001 + assert_in_delta g.opacity, 0.9, 0.0001 + end + + test "round-trips SH rest coefficients" do + cloud = + GaussianCloud.new([ + Gaussian.new({0.0, 0.0, 0.0}, + color: {0.5, 0.5, 0.5}, + sh: [[0.5, 0.5, 0.5], [0.1, 0.2, 0.3], [0.4, 0.5, 0.6]] + ) + ]) + + assert {:ok, bin} = Gsplat.encode(cloud) + assert {:ok, decoded} = Gsplat.decode(bin) + [g] = decoded.gaussians + assert is_list(g.sh) + assert length(List.flatten(tl(g.sh))) == 6 + end +end diff --git a/test/ex_codecs/spatial/codec/ply_extra_test.exs b/test/ex_codecs/spatial/codec/ply_extra_test.exs new file mode 100644 index 0000000..c9a7b8a --- /dev/null +++ b/test/ex_codecs/spatial/codec/ply_extra_test.exs @@ -0,0 +1,72 @@ +defmodule ExCodecs.Spatial.Codec.PLYExtraTest do + use ExUnit.Case, async: true + + alias ExCodecs.Spatial.{Gaussian, GaussianCloud, Point, PointCloud} + alias ExCodecs.Spatial.Codec.PLY + + test "binary big-endian round-trip" do + cloud = PointCloud.new([Point.new(1.5, 2.5, 3.5, color: {9, 8, 7})]) + assert {:ok, bin} = PLY.encode(cloud, format: :binary_be) + assert bin =~ "binary_big_endian" + assert {:ok, decoded} = PLY.decode(bin) + assert_in_delta hd(decoded.points).x, 1.5, 0.0001 + assert hd(decoded.points).color == {9, 8, 7} + end + + test "Gaussian binary PLY with SH" do + cloud = + GaussianCloud.new([ + Gaussian.new({0.0, 1.0, 2.0}, + color: {0.1, 0.2, 0.3}, + sh: [[0.1, 0.2, 0.3], [0.4, 0.5, 0.6]] + ) + ]) + + assert {:ok, bin} = PLY.encode(cloud, format: :binary) + assert {:ok, decoded} = PLY.decode(bin) + assert %GaussianCloud{} = decoded + assert hd(decoded.gaussians).sh != nil + end + + test "encode rejects non-cloud" do + assert {:error, %{reason: :invalid_data}} = PLY.encode(:nope) + end + + test "stream_decode from binary and missing file path content" do + cloud = PointCloud.new([Point.new(0.0, 0.0, 1.0)]) + {:ok, bin} = PLY.encode(cloud) + + points = PLY.stream_decode(bin) |> Enum.to_list() + assert length(points) == 1 + + # Non-existent path-like string without separators is treated as binary PLY data + bad = PLY.stream_decode("not a ply file at all") |> Enum.to_list() + assert [{:error, %{reason: :invalid_data}}] = bad + end + + test "truncated vertex body" do + header = """ + ply + format ascii 1.0 + element vertex 2 + property float x + property float y + property float z + end_header + 0 0 0 + """ + + assert {:error, %{reason: :invalid_data}} = PLY.decode(header) + end + + test "unsupported format line" do + data = """ + ply + format weird 1.0 + element vertex 0 + end_header + """ + + assert {:error, %{reason: :invalid_data}} = PLY.decode(data) + end +end diff --git a/test/ex_codecs/spatial/codec/ply_test.exs b/test/ex_codecs/spatial/codec/ply_test.exs new file mode 100644 index 0000000..40ad477 --- /dev/null +++ b/test/ex_codecs/spatial/codec/ply_test.exs @@ -0,0 +1,95 @@ +defmodule ExCodecs.Spatial.Codec.PLYTest do + use ExUnit.Case, async: true + + alias ExCodecs.Spatial.{Gaussian, GaussianCloud, Point, PointCloud} + alias ExCodecs.Spatial.Codec.PLY + + describe "point cloud ASCII PLY" do + test "round-trips XYZRGB" do + cloud = + PointCloud.new([ + Point.new(1.0, 2.0, 3.0, color: {255, 128, 0}), + Point.new(-1.0, 0.5, 9.0, color: {0, 255, 64}) + ]) + + assert {:ok, binary} = PLY.encode(cloud, format: :ascii) + assert String.starts_with?(binary, "ply\n") + assert binary =~ "format ascii 1.0" + assert binary =~ "property uchar red" + + assert {:ok, decoded} = PLY.decode(binary) + assert length(decoded.points) == 2 + assert hd(decoded.points).color == {255, 128, 0} + assert Float.round(hd(decoded.points).x, 5) == 1.0 + end + + test "round-trips XYZ + normal + attributes" do + cloud = + PointCloud.new([ + Point.new(0.0, 1.0, 2.0, + normal: {0.0, 1.0, 0.0}, + attributes: %{"intensity" => 0.75} + ) + ]) + + assert {:ok, binary} = PLY.encode(cloud) + assert {:ok, decoded} = PLY.decode(binary) + [p] = decoded.points + assert p.normal == {0.0, 1.0, 0.0} + assert_in_delta p.attributes["intensity"], 0.75, 0.0001 + end + + test "round-trips binary little-endian PLY" do + cloud = + PointCloud.new([ + Point.new(1.25, 2.5, 3.75, color: {1, 2, 3, 4}) + ]) + + assert {:ok, binary} = PLY.encode(cloud, format: :binary) + assert binary =~ "binary_little_endian" + assert {:ok, decoded} = PLY.decode(binary) + [p] = decoded.points + assert_in_delta p.x, 1.25, 0.0001 + assert p.color == {1, 2, 3, 4} + end + end + + describe "Gaussian PLY" do + test "round-trips Gaussian clouds" do + cloud = + GaussianCloud.new([ + Gaussian.new({1.0, 2.0, 3.0}, + color: {0.1, 0.2, 0.3}, + opacity: 0.8, + scale: {0.5, 0.6, 0.7}, + rotation: {1.0, 0.0, 0.0, 0.0} + ) + ]) + + assert {:ok, binary} = PLY.encode(cloud, format: :ascii) + assert binary =~ "f_dc_0" + assert binary =~ "opacity" + + assert {:ok, decoded} = PLY.decode(binary) + assert %GaussianCloud{} = decoded + [g] = decoded.gaussians + assert_in_delta elem(g.position, 0), 1.0, 0.0001 + assert_in_delta elem(g.color, 1), 0.2, 0.0001 + assert_in_delta g.opacity, 0.8, 0.0001 + end + + test "can force point_cloud interpretation" do + cloud = + GaussianCloud.new([ + Gaussian.new({0.0, 0.0, 0.0}, color: {0.5, 0.5, 0.5}) + ]) + + assert {:ok, binary} = PLY.encode(cloud) + assert {:ok, %PointCloud{}} = PLY.decode(binary, as: :point_cloud) + end + end + + test "rejects non-PLY data" do + assert {:error, %{reason: :invalid_data}} = PLY.decode("not a ply file") + end +end diff --git a/test/ex_codecs/spatial/coverage_test.exs b/test/ex_codecs/spatial/coverage_test.exs new file mode 100644 index 0000000..82dfbbd --- /dev/null +++ b/test/ex_codecs/spatial/coverage_test.exs @@ -0,0 +1,234 @@ +defmodule ExCodecs.Spatial.CoverageTest do + use ExUnit.Case, async: true + + alias ExCodecs.Spatial + alias ExCodecs.Spatial.{Gaussian, GaussianCloud, Point, PointCloud} + alias ExCodecs.Spatial.Codec.{Binary, Gsplat, PLY} + alias ExCodecs.Spatial.Stream, as: SpatialStream + + describe "binary codec edges" do + test "xyz-only round-trip" do + cloud = PointCloud.new([Point.new(1.0, 2.0, 3.0), Point.new(4.0, 5.0, 6.0)]) + assert {:ok, bin} = Binary.encode(cloud) + assert {:ok, decoded} = Binary.decode(bin) + assert Enum.map(decoded.points, & &1.color) == [nil, nil] + end + + test "unsupported version and truncation" do + assert {:error, _} = Binary.decode(<<"EXCP", 99::little-16, 0::little-16, 1::little-64>>) + assert {:error, _} = Binary.decode(<<"EXCP", 1::little-16, 1::little-16, 1::little-64, 0, 1>>) + + assert [{:error, _}] = + Binary.stream_decode(<<"nope">>) |> Enum.to_list() + end + + test "encode rejects non-cloud" do + assert {:error, %{codec: :spatial_binary}} = Binary.encode(%{}) + end + end + + describe "gsplat edges" do + test "unsupported version and truncation" do + assert {:error, _} = + Gsplat.decode(<<"GSPL", 9::little-16, 0::little-16, 1::little-64, 0::little-16>>) + + assert {:error, _} = + Gsplat.decode( + <<"GSPL", 1::little-16, 0::little-16, 1::little-64, 0::little-16, 1, 2>> + ) + + assert [{:error, _}] = Gsplat.stream_decode(<<"nope">>) |> Enum.to_list() + assert {:error, _} = Gsplat.encode(%{}) + end + end + + describe "PLY typed properties" do + test "ascii double / int / uchar mix" do + data = """ + ply + format ascii 1.0 + comment typed + element vertex 1 + property double x + property double y + property double z + property int label + property ushort code + property short delta + property uint big + property char tiny + end_header + 1.0 2.0 3.0 7 100 -3 999 -1 + """ + + assert {:ok, cloud} = PLY.decode(data) + [p] = cloud.points + assert_in_delta p.x, 1.0, 0.0001 + assert p.attributes["label"] == 7 + end + + test "binary_le with mixed numeric types" do + # Build via encode then is float/uchar; craft header+body manually for doubles + x = 1.25 + y = 2.5 + z = 3.75 + label = 42 + + header = """ + ply + format binary_little_endian 1.0 + element vertex 1 + property float x + property float y + property float z + property int label + end_header + """ + + body = + <> + + assert {:ok, cloud} = PLY.decode(header <> body) + assert hd(cloud.points).attributes["label"] == 42 + end + + test "binary_be floats" do + header = """ + ply + format binary_big_endian 1.0 + element vertex 1 + property float x + property float y + property float z + property ushort code + property uchar red + property uchar green + property uchar blue + end_header + """ + + body = + <<1.0::big-float-32, 2.0::big-float-32, 3.0::big-float-32, 7::big-unsigned-16, 10, 20, 30>> + + assert {:ok, cloud} = PLY.decode(header <> body) + assert hd(cloud.points).color == {10, 20, 30} + assert hd(cloud.points).attributes["code"] == 7 + end + + test "missing magic / format / vertex element" do + assert {:error, _} = PLY.decode("format ascii 1.0\nend_header\n") + assert {:error, _} = PLY.decode("ply\nelement vertex 0\nend_header\n") + + assert {:error, _} = + PLY.decode("ply\nformat ascii 1.0\nend_header\n") + end + + test "list properties unsupported" do + data = """ + ply + format ascii 1.0 + element vertex 0 + property list uchar int vertex_indices + end_header + """ + + assert {:error, _} = PLY.decode(data) + end + + test "stream_decode file path" do + path = Path.join(System.tmp_dir!(), "ex_codecs_ply_#{System.unique_integer([:positive])}.ply") + on_exit(fn -> File.rm(path) end) + + cloud = PointCloud.new([Point.new(9.0, 8.0, 7.0)]) + {:ok, bin} = PLY.encode(cloud) + File.write!(path, bin) + + assert [%Point{x: x}] = PLY.stream_decode(path) |> Enum.to_list() + assert_in_delta x, 9.0, 0.0001 + end + + test "Gaussian ascii with f_rest" do + cloud = + GaussianCloud.new([ + Gaussian.new({0, 0, 0}, sh: [[0.1, 0.2, 0.3], [0.4, 0.5, 0.6], [0.7, 0.8, 0.9]]) + ]) + + assert {:ok, bin} = PLY.encode(cloud, format: :ascii, comments: ["sh test"]) + assert bin =~ "f_rest_0" + assert {:ok, decoded} = PLY.decode(bin, as: :gaussian_cloud) + assert hd(decoded.gaussians).sh != nil + end + end + + describe "stream helpers" do + test "encode_to_file with enumerable and bad path" do + path = Path.join(System.tmp_dir!(), "ex_codecs_pts_#{System.unique_integer([:positive])}.ply") + on_exit(fn -> File.rm(path) end) + + assert :ok = + SpatialStream.encode_to_file([Point.new(1, 2, 3)], path, format: :ply) + + assert {:error, _} = + SpatialStream.encode_to_file([Point.new(1, 2, 3)], "/no/such/dir/x.ply", + format: :ply + ) + end + + test "stream_decode reads spatial_binary file" do + path = + Path.join(System.tmp_dir!(), "ex_codecs_bin_#{System.unique_integer([:positive])}.excp") + + on_exit(fn -> File.rm(path) end) + + {:ok, bin} = Spatial.encode(PointCloud.new([Point.new(1, 2, 3)]), format: :spatial_binary) + File.write!(path, bin) + + assert [%Point{}] = + Spatial.stream_decode(path, format: :spatial_binary) |> Enum.to_list() + end + + test "stream encode error tuples" do + assert {:error, _} = + Spatial.stream_encode([{:error, :boom}], format: :ply) + end + + test "unsupported empty format" do + assert {:error, %{reason: :unsupported_codec}} = + Spatial.stream_encode([], format: :sog) + end + end + + describe "point cloud remaining branches" do + test "explicit bounds and mixed color detection" do + bounds = ExCodecs.Spatial.Bounds.new({0, 0, 0}, {1, 1, 1}) + + cloud = + PointCloud.new([Point.new(0, 0, 0, color: {1, 2, 3}), Point.new(1, 1, 1)], + bounds: bounds, + metadata: ExCodecs.Spatial.Metadata.new(comments: ["x"]) + ) + + assert cloud.bounds == bounds + refute PointCloud.colored?(cloud) + refute PointCloud.has_normals?(cloud) + end + end + + describe "encode_to_file extras" do + test "gaussian cloud and gsplat file stream" do + path = Path.join(System.tmp_dir!(), "ex_codecs_g_#{System.unique_integer([:positive])}.gspl") + on_exit(fn -> File.rm(path) end) + + cloud = GaussianCloud.new([Gaussian.new({1.0, 2.0, 3.0})]) + assert :ok = SpatialStream.encode_to_file(cloud, path, format: :gsplat) + + assert [%Gaussian{}] = + Spatial.stream_decode(path, format: :gsplat) |> Enum.to_list() + end + + test "propagates encode errors" do + assert {:error, _} = + SpatialStream.encode_to_file([Point.new(0, 0, 0)], "/tmp/x.gspl", format: :gsplat) + end + end +end diff --git a/test/ex_codecs/spatial/point_test.exs b/test/ex_codecs/spatial/point_test.exs new file mode 100644 index 0000000..671524b --- /dev/null +++ b/test/ex_codecs/spatial/point_test.exs @@ -0,0 +1,21 @@ +defmodule ExCodecs.Spatial.PointTest do + use ExUnit.Case, async: true + + alias ExCodecs.Spatial.Point + + doctest ExCodecs.Spatial.Point + + test "creates points with optional color and normal" do + p = + Point.new(1, 2, 3, + color: {10, 20, 30, 255}, + normal: {0.0, 1.0, 0.0}, + attributes: %{"intensity" => 0.5} + ) + + assert Point.coords(p) == {1.0, 2.0, 3.0} + assert Point.colored?(p) + assert Point.has_normal?(p) + assert p.attributes["intensity"] == 0.5 + end +end diff --git a/test/ex_codecs/spatial/stream_test.exs b/test/ex_codecs/spatial/stream_test.exs new file mode 100644 index 0000000..879479f --- /dev/null +++ b/test/ex_codecs/spatial/stream_test.exs @@ -0,0 +1,69 @@ +defmodule ExCodecs.Spatial.StreamTest do + use ExUnit.Case, async: true + + alias ExCodecs.Spatial + alias ExCodecs.Spatial.{Gaussian, Point, PointCloud} + + test "stream encode empty clouds" do + assert {:ok, ply} = Spatial.stream_encode([], format: :ply) + assert {:ok, %PointCloud{points: []}} = Spatial.decode(ply, format: :ply) + + assert {:ok, bin} = Spatial.stream_encode([], format: :spatial_binary) + assert {:ok, %PointCloud{points: []}} = Spatial.decode(bin, format: :spatial_binary) + + assert {:ok, gspl} = Spatial.stream_encode([], format: :gsplat) + assert {:ok, %{gaussians: []}} = Spatial.decode(gspl, format: :gsplat) + end + + test "stream decode unsupported format yields error" do + assert [{:error, %{reason: :unsupported_codec}}] = + Spatial.stream_decode(<<>>, format: :sog) |> Enum.to_list() + end + + test "stream encode rejects non-spatial items" do + assert {:error, %{reason: :invalid_data}} = + Spatial.stream_encode([:nope], format: :ply) + end + + test "stream decode spatial_binary and gsplat binaries" do + cloud = PointCloud.new([Point.new(1.0, 2.0, 3.0)]) + {:ok, bin} = Spatial.encode(cloud, format: :spatial_binary) + + points = Spatial.stream_decode(bin, format: :spatial_binary) |> Enum.to_list() + assert length(points) == 1 + + gs = [Gaussian.new({0.0, 0.0, 0.0})] + {:ok, gbin} = Spatial.stream_encode(gs, format: :gsplat) + items = Spatial.stream_decode(gbin, format: :gsplat) |> Enum.to_list() + assert length(items) == 1 + end + + test "encode rejects wrong type for format" do + cloud = PointCloud.new([Point.new(0, 0, 0)]) + assert {:error, %{codec: :gsplat}} = Spatial.encode(cloud, format: :gsplat) + + gcloud = Spatial.GaussianCloud.new([Gaussian.new({0, 0, 0})]) + + assert {:error, %{codec: :spatial_binary}} = + Spatial.encode(gcloud, format: :spatial_binary) + + assert {:error, %{reason: :unsupported_codec}} = + Spatial.encode(cloud, format: :unknown) + + assert {:error, %{reason: :invalid_data}} = Spatial.encode(:nope, format: :ply) + assert {:error, %{reason: :invalid_data}} = Spatial.decode(123, format: :ply) + end + + test "registry decode with format: points at Spatial category" do + assert {:error, %{reason: :invalid_options, message: message}} = + ExCodecs.decode(<<"ply\n">>, format: :ply) + + assert message =~ "ExCodecs.Spatial.decode" + end + + test "top-level stream helpers still delegate to Spatial" do + cloud = PointCloud.new([Point.new(1.0, 2.0, 3.0)]) + {:ok, bin} = Spatial.encode(cloud, format: :ply) + assert [%Point{}] = ExCodecs.stream_decode(bin, format: :ply) |> Enum.to_list() + end +end diff --git a/test/ex_codecs/spatial/types_test.exs b/test/ex_codecs/spatial/types_test.exs new file mode 100644 index 0000000..7d821a9 --- /dev/null +++ b/test/ex_codecs/spatial/types_test.exs @@ -0,0 +1,74 @@ +defmodule ExCodecs.Spatial.TypesTest do + use ExUnit.Case, async: true + + alias ExCodecs.Spatial.{ + Bounds, + Gaussian, + GaussianCloud, + Metadata, + Point, + PointCloud, + Transform + } + + describe "PointCloud" do + test "size, colored?, normals, add_point, with_bounds" do + empty = PointCloud.new([]) + assert PointCloud.size(empty) == 0 + refute PointCloud.colored?(empty) + refute PointCloud.has_normals?(empty) + + p1 = Point.new(0, 0, 0, color: {1, 2, 3}, normal: {0.0, 1.0, 0.0}) + p2 = Point.new(1, 1, 1, color: {4, 5, 6}, normal: {1.0, 0.0, 0.0}) + cloud = PointCloud.new([p1], compute_bounds: false) + assert cloud.bounds == nil + + cloud = PointCloud.add_point(cloud, p2) + assert PointCloud.size(cloud) == 2 + assert PointCloud.colored?(cloud) + assert PointCloud.has_normals?(cloud) + assert cloud.bounds.max_x == 1.0 + + cloud = PointCloud.with_bounds(%{cloud | bounds: nil}) + assert %Bounds{} = cloud.bounds + end + end + + describe "GaussianCloud" do + test "size and with_bounds" do + cloud = GaussianCloud.new([Gaussian.new({1, 2, 3})], compute_bounds: false) + assert GaussianCloud.size(cloud) == 1 + assert cloud.bounds == nil + cloud = GaussianCloud.with_bounds(cloud) + assert cloud.bounds.min_x == 1.0 + end + end + + describe "Metadata" do + test "put, get, add_comment" do + meta = Metadata.new(source: "test") + meta = Metadata.put(meta, "crs", "EPSG:4326") + meta = Metadata.add_comment(meta, "hello") + assert Metadata.get(meta, "crs") == "EPSG:4326" + assert Metadata.get(meta, "missing", :default) == :default + assert meta.comments == ["hello"] + assert meta.source == "test" + end + end + + describe "Transform" do + test "identity and new" do + assert Transform.identity().scale == 1.0 + + t = + Transform.new( + translation: {1, 2, 3}, + rotation: {0.5, 0.5, 0.5, 0.5}, + scale: 2 + ) + + assert t.translation == {1.0, 2.0, 3.0} + assert t.scale == 2.0 + end + end +end diff --git a/test/ex_codecs/spatial_test.exs b/test/ex_codecs/spatial_test.exs new file mode 100644 index 0000000..42a182a --- /dev/null +++ b/test/ex_codecs/spatial_test.exs @@ -0,0 +1,73 @@ +defmodule ExCodecs.SpatialTest do + use ExUnit.Case, async: true + + alias ExCodecs.Spatial + alias ExCodecs.Spatial.{Gaussian, GaussianCloud, Point, PointCloud} + + describe "available_formats/0" do + test "lists supported formats" do + assert :ply in Spatial.available_formats() + assert :gsplat in Spatial.available_formats() + assert Spatial.supports?(:ply) + refute Spatial.supports?(:sog) + end + end + + describe "encode/decode" do + test "PLY via Spatial API" do + cloud = PointCloud.new([Point.new(1.0, 2.0, 3.0)]) + assert {:ok, bin} = Spatial.encode(cloud, format: :ply) + assert {:ok, decoded} = Spatial.decode(bin, format: :ply) + assert length(decoded.points) == 1 + end + + test "registry API rejects spatial structs and points at Spatial" do + cloud = PointCloud.new([Point.new(0.0, 1.0, 2.0, color: {9, 8, 7})]) + + assert {:error, %ExCodecs.Error{reason: :invalid_data}} = + ExCodecs.encode(cloud, format: :ply) + + assert {:ok, bin} = Spatial.encode(cloud, format: :ply) + + assert {:error, %ExCodecs.Error{reason: :invalid_options}} = + ExCodecs.decode(bin, format: :ply) + + assert {:ok, decoded} = Spatial.decode(bin, format: :ply) + assert hd(decoded.points).color == {9, 8, 7} + end + + test "stream decode and encode" do + cloud = + PointCloud.new([ + Point.new(0.0, 0.0, 0.0), + Point.new(1.0, 1.0, 1.0) + ]) + + assert {:ok, bin} = Spatial.encode(cloud, format: :ply) + + points = + Spatial.stream_decode(bin, format: :ply) + |> Enum.to_list() + + assert length(points) == 2 + assert {:ok, bin2} = Spatial.stream_encode(points, format: :ply) + assert {:ok, _} = Spatial.decode(bin2, format: :ply) + end + + test "stream_encode Gaussian cloud via gsplat" do + gs = [Gaussian.new({1.0, 2.0, 3.0})] + assert {:ok, bin} = ExCodecs.stream_encode(gs, format: :gsplat) + assert {:ok, %GaussianCloud{}} = Spatial.decode(bin, format: :gsplat) + end + end + + test "loads example PLY fixtures" do + path = Path.join([:code.priv_dir(:ex_codecs), "examples", "spatial", "cube_corners.ply"]) + assert {:ok, cloud} = Spatial.decode(File.read!(path), format: :ply) + assert length(cloud.points) == 4 + + gpath = Path.join([:code.priv_dir(:ex_codecs), "examples", "spatial", "two_gaussians.ply"]) + assert {:ok, %GaussianCloud{gaussians: gs}} = Spatial.decode(File.read!(gpath), format: :ply) + assert length(gs) == 2 + end +end diff --git a/test/ex_codecs_test.exs b/test/ex_codecs_test.exs index d62175c..77dd088 100644 --- a/test/ex_codecs_test.exs +++ b/test/ex_codecs_test.exs @@ -191,17 +191,21 @@ defmodule ExCodecsTest do describe "codec_unavailable path" do test "encode with unavailable codec returns codec_unavailable error" do - :ok = ExCodecs.CodecRegistry.register_unavailable(:future_codec, :compression) + name = :"future_codec_#{System.unique_integer([:positive])}" + :ok = ExCodecs.CodecRegistry.register_unavailable(name, :compression) + on_exit(fn -> ExCodecs.CodecRegistry.unregister(name) end) assert {:error, %ExCodecs.Error{reason: :codec_unavailable}} = - ExCodecs.encode(:future_codec, "data") + ExCodecs.encode(name, "data") end test "decode with unavailable codec returns codec_unavailable error" do - :ok = ExCodecs.CodecRegistry.register_unavailable(:future_codec2, :compression) + name = :"future_codec2_#{System.unique_integer([:positive])}" + :ok = ExCodecs.CodecRegistry.register_unavailable(name, :compression) + on_exit(fn -> ExCodecs.CodecRegistry.unregister(name) end) assert {:error, %ExCodecs.Error{reason: :codec_unavailable}} = - ExCodecs.decode(:future_codec2, <<1, 2, 3>>) + ExCodecs.decode(name, <<1, 2, 3>>) end end diff --git a/test/fixtures/blosc2/README.md b/test/fixtures/blosc2/README.md new file mode 100644 index 0000000..49d81ed --- /dev/null +++ b/test/fixtures/blosc2/README.md @@ -0,0 +1,11 @@ +# Blosc2 golden chunks + +Generated with python-blosc2 for cross-implementation tests. + +```sh +python3 -c 'import blosc2; print(blosc2.__version__)' +# regenerate with the script in this directory if present, or: +# see ExCodecs.Compression.Blosc2InteropTest +``` + +Files: `*.bin` = compressed chunk, `*.src` = original payload. diff --git a/test/fixtures/blosc2/blosclz_noshuffle.bin b/test/fixtures/blosc2/blosclz_noshuffle.bin new file mode 100644 index 0000000000000000000000000000000000000000..4bcc81e810d93287b182d9b681d765632b89134f GIT binary patch literal 326 zcmZQ&6lG)(U|;}YH%1_h22_B2IiR>bvxushdqiec_nfu+&Oi9bB&=fU7M@YrHG9q8 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guides/choosing_compression_codec.md | 83 +++- guides/codec_fundamentals.md | 6 +- guides/runtime_codec_discovery.md | 38 +- guides/understanding_blosc2.md | 109 ++--- guides/understanding_lz4.md | 38 +- guides/understanding_spatial_codecs.md | 32 +- guides/understanding_zstd.md | 22 +- lib/ex_codecs.ex | 81 +++- lib/ex_codecs/application.ex | 28 +- lib/ex_codecs/codec.ex | 35 +- lib/ex_codecs/codec_registry.ex | 114 ++++- lib/ex_codecs/compression/blosc2.ex | 12 +- lib/ex_codecs/compression/bzip2.ex | 12 +- lib/ex_codecs/compression/lz4.ex | 21 +- lib/ex_codecs/compression/snappy.ex | 13 +- lib/ex_codecs/compression/zstd.ex | 34 +- lib/ex_codecs/error.ex | 7 + lib/ex_codecs/native.ex | 10 +- lib/ex_codecs/nif.ex | 31 ++ lib/ex_codecs/spatial.ex | 106 +++-- lib/ex_codecs/spatial/codec/ply.ex | 178 ++++---- lib/ex_codecs/spatial/point.ex | 25 +- lib/ex_codecs/spatial/stream.ex | 8 +- livebooks/01_introduction.livemd | 35 +- livebooks/02_compression_fundamentals.livemd | 14 +- livebooks/03_codec_comparison.livemd | 29 +- livebooks/04_building_storage_systems.livemd | 24 +- livebooks/05_zarr_style_workloads.livemd | 8 +- livebooks/06_spatial_codecs.livemd | 210 +++++++++ mix.exs | 15 +- native/ex_codecs_native/Cargo.lock | 302 +++++++++++++ native/ex_codecs_native/Cargo.toml | 4 +- native/ex_codecs_native/src/atoms.rs | 3 +- native/ex_codecs_native/src/blosc2_codec.rs | 44 +- native/ex_codecs_native/src/bzip2_codec.rs | 30 +- native/ex_codecs_native/src/lz4_codec.rs | 22 +- native/ex_codecs_native/src/snappy_codec.rs | 19 +- native/ex_codecs_native/src/util.rs | 5 + native/ex_codecs_native/src/zstd_codec.rs | 40 +- test/ex_codecs/codec_registry_test.exs | 23 + test/ex_codecs/codec_test.exs | 2 + test/ex_codecs/compression/lz4_test.exs | 8 + test/ex_codecs/compression/zstd_test.exs | 37 +- test/ex_codecs/coverage_boost_test.exs | 435 +++++++++++++++++++ test/ex_codecs/nif_test.exs | 5 + test/ex_codecs/spatial/point_test.exs | 5 + test/ex_codecs/spatial_test.exs | 63 +++ 52 files changed, 2261 insertions(+), 593 deletions(-) create mode 100644 docs/spatial_formats.md create mode 100644 livebooks/06_spatial_codecs.livemd create mode 100644 native/ex_codecs_native/Cargo.lock create mode 100644 test/ex_codecs/coverage_boost_test.exs diff --git a/.gitignore b/.gitignore index cf8bfac..712c574 100644 --- a/.gitignore +++ b/.gitignore @@ -25,7 +25,6 @@ ex_codecs-*.tar # Rust artifacts /native/ex_codecs_native/target/ -/native/ex_codecs_native/Cargo.lock # Rustler precompiled cache /priv/native/ diff --git a/CHANGELOG.md b/CHANGELOG.md index fa6d19a..6727bbb 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -26,16 +26,25 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0 delegate to Spatial for convenience. - Example datasets under `priv/examples/spatial/`. - Guide: `guides/understanding_spatial_codecs.md`. +- Wire-format freeze: `docs/spatial_formats.md` (EXCP / GSPL / PLY rules). +- Spatial tutorial Livebook: `livebooks/06_spatial_codecs.livemd`; existing + Livebooks now target v0.2.0 APIs and metadata. +- Shared codec catalog discovery across compression and spatial categories, + including `ExCodecs.available_codecs/1` and `%ExCodecs.Codec{interface: ...}`. - Registry `unregister/1` and re-registration on registry process restart. -- Error reasons `:io_error` and `:truncated_input`. +- Error reasons `:io_error`, `:truncated_input`, and `:output_limit_exceeded`. +- Decode option `:max_output_size` (default **256 MiB**) on all compression + codecs — rejects decompression bombs. ### Changed - **Native NIF is pure Rust** — no C compression libraries: - - Zstd via `ruzstd` (not libzstd) + - Zstd via `structured-zstd` (not libzstd / not stock `ruzstd` encoder) - Bzip2 via `bzip2` + pure-Rust `libbz2-rs-sys` - Zlib (Blosc2 inner) via `flate2` rust backend - LZ4 / Snappy unchanged pure crates +- **Zstd `:level`** (1–22) is functional on the pure-Rust encoder (ratios may + differ from C libzstd at the same numeric level). - **Blosc2**: C-Blosc2-compatible **chunk** format via pure-Rust `blosc2-pure-rs` (`:blosclz`, `:lz4`, `:lz4hc`, `:zstd`, `:zlib` + shuffle/bitshuffle). Golden tests against python-blosc2 fixtures. @@ -44,8 +53,18 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0 - NIF load checked at registration; NIF calls wrapped so `:nif_not_loaded` becomes `{:error, %ExCodecs.Error{}}` instead of raising. - Safer PLY header parsing (no raise on malformed element lines / unknown types). +- Point attributes normalized to **string keys** (atoms accepted at `Point.new/4`). - Public API docs cover spatial formats alongside compression codecs. -- Test coverage threshold set to 84% while the new spatial PLY surface grows. +- Spatial encode/decode resolves PLY, EXCP, and GSPL implementations through + the shared ETS catalog while retaining the category-safe Spatial API. +- Test coverage threshold restored to **95%** after expanding spatial and NIF + edge-case coverage. + +### Notes + +- Precompiled NIF checksums must be regenerated when publishing GitHub release + artifacts for `0.2.0`; until then local builds use `force_build` / source compile. +- `native/ex_codecs_native/Cargo.lock` is committed for reproducible NIF builds. ## [0.1.1] - 2026-06-15 diff --git a/README.md b/README.md index 2a87203..bc6c1aa 100644 --- a/README.md +++ b/README.md @@ -8,11 +8,9 @@ [![Elixir](https://img.shields.io/badge/Elixir-%7E%3E%201.17-purple.svg)](https://elixir-lang.org) [![Coverage Status](https://coveralls.io/repos/github/thanos/codecs/badge.svg?branch=main)](https://coveralls.io/github/thanos/codecs?branch=main) -An extensible BEAM-native codec framework for Elixir. - -Primary API: `ExCodecs.encode(codec, binary, opts)` / `decode/3` (registry). -`ExCodecs.Compression` is a naming alias; `ExCodecs.Spatial` holds domain -types for point clouds / Gaussians (not overloads of the registry API). +An extensible BEAM-native codec framework for Elixir with specialized category +APIs. Binary registry codecs use `ExCodecs.encode/3` / `decode/3`; +`ExCodecs.Spatial` handles point-cloud and Gaussian domain types. **Blosc2** produces C-Blosc2-compatible **chunks** only (not super-chunk / B2ND / `.b2frame`). Standalone `:snappy` is separate from Blosc2 `cname:`. @@ -21,11 +19,17 @@ B2ND / `.b2frame`). Standalone `:snappy` is separate from Blosc2 `cname:`. ExCodecs is not a compression library. It is a codec framework. -Compression is merely the first codec category. The architecture supports future -expansion into hashing, checksums, binary encodings, content addressing, and -streaming -- without changing the public API. Every codec implements the -`ExCodecs.Codec` behaviour and registers with the `ExCodecs.CodecRegistry` at -startup, meaning new categories slot in without touching existing code. +Compression and spatial formats are categories in one framework. Each category +uses an API shaped for its data: + +- Binary→binary registry codecs implement `ExCodecs.Codec` and use + `ExCodecs.encode/3` / `decode/3`. +- Spatial struct↔format codecs use `ExCodecs.Spatial`. + +Discovery is category-specific: `ExCodecs.available_codecs/0` lists registered +binary codecs, while `ExCodecs.Spatial.available_formats/0` lists spatial +formats. This keeps one framework and error model without forcing unlike data +shapes through an overloaded function. The `encode`/`decode` naming is category-agnostic: for compression codecs, encoding is compressing and decoding is decompressing; for a future hash codec, @@ -54,7 +58,7 @@ Precompiled NIF binaries are available for macOS (Intel and ARM64), Linux automatically from the [GitHub releases](https://github.com/thanos/codecs/releases) when you run `mix deps.get`. If a precompiled artifact is not available for your target, ExCodecs falls back to compiling the Rust NIF from source (requires -Rust 1.85+). The native crate is **pure Rust** (no C toolchain / system +Rust 1.92+). The native crate is **pure Rust** (no C toolchain / system compression libraries). ## Quick Start @@ -72,34 +76,43 @@ original #=> "hello world" {:ok, compressed} = ExCodecs.Compression.compress(:lz4, data) {:ok, original} = ExCodecs.Compression.decompress(:lz4, compressed) -# Discovery (registered binary codecs only) -ExCodecs.available_codecs() #=> [:blosc2, :bzip2, :lz4, :snappy, :zstd] +# Shared discovery +ExCodecs.available_codecs() #=> [:blosc2, :bzip2, :gsplat, :lz4, :ply, :snappy, :spatial_binary, :zstd] +ExCodecs.available_codecs(:compression) #=> [:blosc2, :bzip2, :lz4, :snappy, :zstd] +ExCodecs.available_codecs(:spatial) #=> [:gsplat, :ply, :spatial_binary] ExCodecs.supports?(:zstd) #=> true ExCodecs.codec_info(:zstd) #=> {:ok, %ExCodecs.Codec{name: :zstd, category: :compression, ...}} -# Spatial category (structs ↔ formats — not registry atoms) +# Spatial category API (structs ↔ formats) alias ExCodecs.Spatial.{Point, PointCloud} cloud = PointCloud.new([Point.new(0.0, 0.0, 0.0, color: {255, 0, 0})]) {:ok, ply} = ExCodecs.Spatial.encode(cloud, format: :ply) {:ok, cloud} = ExCodecs.Spatial.decode(ply, format: :ply) ExCodecs.Spatial.stream_decode(ply, format: :ply) |> Enum.to_list() +ExCodecs.Spatial.available_formats() #=> [:ply, :spatial_binary, :gsplat] +ExCodecs.codec_info(:ply) #=> {:ok, %ExCodecs.Codec{category: :spatial, interface: :spatial, ...}} ``` ## API Overview -### Primary API (one shape) +### Binary registry API ```elixir {:ok, encoded} = ExCodecs.encode(:zstd, binary, level: 3) {:ok, decoded} = ExCodecs.decode(:zstd, compressed) ``` -Always **codec atom + binary**. That is the original framework contract. +The binary registry API is always **codec atom + binary**. -**Helpers (not a second protocol):** +### Category APIs -- `ExCodecs.Compression.compress/3` — same as `encode/3` for compression codecs -- `ExCodecs.Spatial` — point clouds / Gaussians (struct ↔ format; not registry atoms) +- `ExCodecs.Compression.compress/3` — compression terminology over the binary + registry API. +- `ExCodecs.Spatial.encode/2` / `decode/2` — point clouds and Gaussians + (struct↔format). + +These are specialized entry points in the same framework, sharing conventions +such as tagged results and `%ExCodecs.Error{}`. ### `encode/3` / `decode/3` @@ -109,11 +122,13 @@ First argument is always a **codec atom**. Returns `{:ok, binary}` or ### `available_codecs/0` ```elixir -ExCodecs.available_codecs() #=> [:blosc2, :bzip2, :lz4, :snappy, :zstd] +ExCodecs.available_codecs() # all available catalog entries +ExCodecs.available_codecs(:spatial) #=> [:gsplat, :ply, :spatial_binary] ``` Returns a sorted list of codec atoms that are both registered and have a -loaded native implementation. +loaded implementation. Use `available_codecs/1` to filter the shared catalog +by category. ### `supports?/1` @@ -142,11 +157,11 @@ Returns a structured `%ExCodecs.Codec{}` struct with metadata, or | Codec | Category | Configurable | Streaming | Options | |-----------|-------------|--------------|-----------|------------------------------------------------| -| `:zstd` | compression | Yes | No | `level` (1-22, default 3; pure-Rust backend) | -| `:lz4` | compression | No | No | -- (size-prepended `lz4_flex` blocks) | -| `:snappy` | compression | No | No | -- | -| `:bzip2` | compression | Yes | No | `block_size` (1-9, default 9) | -| `:blosc2` | compression | Yes | No | C-Blosc2 **chunk** only (not super-chunk/B2ND/`.b2frame`). `cname`: `:blosclz`/`:lz4`/`:lz4hc`/`:zstd`/`:zlib` — not `:snappy` (use codec `:snappy`). `clevel` 0-9; `shuffle`; `typesize` | +| `:zstd` | compression | Yes | No | `level` 1-22 (pure-Rust `structured-zstd`); `max_output_size` (default 256 MiB) | +| `:lz4` | compression | No | No | size-prepended `lz4_flex`; `max_output_size` | +| `:snappy` | compression | No | No | `max_output_size` | +| `:bzip2` | compression | Yes | No | `block_size` 1-9; `max_output_size` | +| `:blosc2` | compression | Yes | No | C-Blosc2 **chunk** only. `cname` / `clevel` / `shuffle` / `typesize`; `max_output_size` | ### Spatial formats @@ -156,30 +171,43 @@ Returns a structured `%ExCodecs.Codec{}` struct with metadata, or | `:spatial_binary` | PointCloud | Compact little-endian `EXCP` container | | `:gsplat` | GaussianCloud | Compact little-endian `GSPL` container | -See [Understanding Spatial Codecs](guides/understanding_spatial_codecs.md). +See [Understanding Spatial Codecs](guides/understanding_spatial_codecs.md) and +the frozen wire layouts in [docs/spatial_formats.md](docs/spatial_formats.md). + +### Known limitations + +- **Zstd** uses pure-Rust `structured-zstd`. Levels 1–22 work, but compressed + bytes/ratios are not guaranteed identical to C libzstd. +- **Decompression** defaults to a **256 MiB** `max_output_size`. Raise it only + for trusted inputs; do not decompress untrusted payloads without a tight limit. +- Spatial `stream_*` helpers **materialize** full payloads today. ## Architecture ExCodecs is layered as follows: -1. **Public registry API** (`ExCodecs`) — `encode/3`, `decode/3`, - `available_codecs/0`, `supports?/1`, `codec_info/1` for **binary codecs**. +1. **Category APIs** — `ExCodecs` provides the binary registry API; + `ExCodecs.Compression` adds compression terminology; `ExCodecs.Spatial` + handles spatial domain types and formats. 2. **Codec Behaviour** (`ExCodecs.Codec`) — `encode/2` / `decode/2` on binaries; optional `__codec_info__/0` for registry metadata. -3. **Codec Registry** (`ExCodecs.CodecRegistry`) — ETS map of codec atoms → - modules, populated at application startup. +3. **Shared codec catalog** (`ExCodecs.CodecRegistry`) — ETS map of codec atoms + to modules, categories, interface shapes, and metadata, populated at startup. 4. **Native NIFs** (`ExCodecs.Native`) — pure-Rust compression via `rustler_precompiled` (or local compile). -5. **Category modules** — `ExCodecs.Compression` (aliases for registry codecs) - and `ExCodecs.Spatial` (struct↔format codecs, not registry atoms). +5. **Category discovery** — `available_codecs/0` lists the whole catalog; + `available_codecs/1` filters it, and + `ExCodecs.Spatial.available_formats/0` provides the spatial category's + preferred built-in order. -To add a **registry** codec: implement `ExCodecs.Codec`, wire a NIF if needed, -register in `ExCodecs.Application`. Spatial formats are added under -`ExCodecs.Spatial` instead. +To add a binary codec: implement `ExCodecs.Codec`, wire a NIF if needed, and +register it with `interface: :binary`. Spatial implementations live under +`ExCodecs.Spatial` and register with `category: :spatial` and +`interface: :spatial`. ## Error Handling @@ -195,6 +223,9 @@ Error reasons are atoms: | `:compression_failed` | The underlying compression operation failed | | `:decompression_failed`| The underlying decompression operation failed | | `:nif_not_loaded` | The NIF library could not be loaded | +| `:io_error` | File read/write failure | +| `:truncated_input` | Incomplete binary | +| `:output_limit_exceeded` | Decompress would exceed `max_output_size` | ```elixir {:error, error} = ExCodecs.encode(:unknown, "data") @@ -249,7 +280,7 @@ mix docs - Elixir 1.17+ - Erlang/OTP 26+ -- Rust 1.85+ (only required if precompiled NIFs are unavailable for your platform) +- Rust 1.92+ (only required if precompiled NIFs are unavailable for your platform) ## License diff --git a/docs/architecture.md b/docs/architecture.md index 862ce6d..7118de7 100644 --- a/docs/architecture.md +++ b/docs/architecture.md @@ -20,8 +20,8 @@ A production-quality, extensible BEAM-native codec framework for Elixir. ## Design Philosophy -ExCodecs is not a compression library. It is a codec framework where -compression happens to be the first implemented category. +ExCodecs is not only a compression library. It is a codec framework with +compression and spatial categories. The central insight is that many binary transformations -- compression, hashing, checksums, binary encodings, content addressing -- share the same @@ -37,10 +37,11 @@ Two terminology decisions flow from this insight: tag. Base64 encodes binary into ASCII. The encode/decode terminology unifies all codec categories under one mental model. -2. **Codec framework, not compression library.** The architecture must support - adding, discovering, and querying codecs at runtime without changing the - public API. A new codec category should require adding a namespace module - and implementing two callbacks -- nothing more. +2. **Codec framework, not compression library.** Categories belong to one + framework but may expose APIs suited to their data shape. Binary→binary + codecs share the registry behaviour; domain codecs such as spatial formats + use a category-specific contract. All categories retain the same tagged + result and structured-error conventions. The result is an API where `ExCodecs.encode(:zstd, data)` and `ExCodecs.encode(:sha256, data)` look and feel the same, even though one @@ -51,63 +52,61 @@ reversibly compresses data and the other irreversibly hashes it. ## Architecture Overview ``` -+---------------------------------------------------------------+ -| Public API | -| ExCodecs.encode/3 ExCodecs.decode/3 | -| ExCodecs.available_codecs/0 ExCodecs.supports?/1 | -| ExCodecs.codec_info/1 | -+----------------------------+----------------------------------+ - | - +--------v--------+ - | CodecRegistry | - | (ETS-backed) | - +--------+--------+ - | - +--------------+---------------+ - | | | - +---------v----+ +------v-----+ +-----v------+ - | :compression | | :hashing | | :checksum | (future) - | namespace | | (future) | | (future) | - +---------+----+ +------------+ +------------+ - | - +---------+----------+-----------+----------+ - | | | | | - +---+ +---+ +-------+ +-----+ +--------+ - |Zstd| |LZ4| |Snappy| |Bzip2| |Blosc2 | - +---+ +---+ +-------+ +-----+ +--------+ - | | | | | - +---+---+--------+----------+----------+ - | - +-----v------+ - | Native NIF | (Rustler, DirtyCpu scheduling) - +------------+ - | - +-----v-----+ - | Rust impl | (zstd, lz4_flex, snap, bzip2, pure Rust blosc2) - +-----------+ -``` - -The architecture is layered in four tiers: ++------------------------------------------------------------------+ +| Public discovery | +| available_codecs/0,1 supports?/1 codec_info/1 | ++-------------------------------+----------------------------------+ + | + +--------v---------+ + | Shared catalog | + | CodecRegistry/ETS| + +---+----------+---+ + | | + +------------v--+ +--v----------------+ + | :compression | | :spatial | + | interface: | | interface: | + | :binary | | :spatial | + +-------+--------+ +---------+----------+ + | | + ExCodecs.encode/3, decode/3 ExCodecs.Spatial.encode/2, + | decode/2, stream helpers + +--------------+------+ +---------+---------+ + | Zstd/LZ4/Snappy/... | | PLY / EXCP / GSPL | + +--------------+------+ +-------------------+ + | + +--------v---------+ + | Rustler NIFs | + | pure-Rust codecs | + +------------------+ +``` + +Discovery is unified; operation dispatch is category-safe. The catalog's +`interface` metadata prevents top-level binary encode/decode from accidentally +calling a struct↔format codec. `ExCodecs.Spatial` resolves its implementations +from the same catalog. + +The implementation is layered in four tiers: 1. **Public API** -- The user-facing `ExCodecs` module providing `encode`, `decode`, `available_codecs`, `supports?`, and `codec_info`. -2. **Registry** -- The `CodecRegistry` module backed by an ETS table that maps - codec atoms to module references, category atoms, and metadata. +2. **Shared catalog** -- The `CodecRegistry` module backed by an ETS table that + maps codec atoms to modules, categories, interface shapes, and metadata. -3. **Codec modules** -- Individual modules implementing `ExCodecs.Codec`, one - per codec algorithm. Each module validates options and delegates to the NIF. +3. **Codec modules** -- Binary modules implement `ExCodecs.Codec`; spatial + modules expose the category's struct↔format contract. -4. **Native layer** -- The Rustler NIF (`ExCodecs.Native`) providing the actual - algorithmic implementations compiled from Rust. +4. **Native layer** -- Compression modules delegate to the Rustler NIF + (`ExCodecs.Native`). Spatial codecs are Elixir implementations in v0.2.0. --- ## Public API -The public API surface is intentionally small for compression (encode/decode -plus discovery). Spatial adds `stream_encode` / `stream_decode` and format-based -overloads on the top-level module. +The binary registry API is intentionally small (encode/decode plus discovery). +Spatial uses `ExCodecs.Spatial.encode/2` / `decode/2`; top-level +`stream_encode/2` and `stream_decode/2` are convenience delegates for spatial +data. Top-level `encode/3` / `decode/3` are not overloaded for spatial structs. ```elixir # Encoding and decoding @@ -115,7 +114,9 @@ ExCodecs.encode(:zstd, data, level: 3) #=> {:ok, binary} | {:error, Error. ExCodecs.decode(:zstd, compressed) #=> {:ok, binary} | {:error, Error.t()} # Discovery -ExCodecs.available_codecs() #=> [:bzip2, :blosc2, :lz4, :snappy, :zstd] +ExCodecs.available_codecs() #=> [..., :gsplat, :ply, :spatial_binary, ...] +ExCodecs.available_codecs(:compression) #=> [:blosc2, :bzip2, :lz4, :snappy, :zstd] +ExCodecs.available_codecs(:spatial) #=> [:gsplat, :ply, :spatial_binary] ExCodecs.supports?(:zstd) #=> true | false ExCodecs.codec_info(:zstd) #=> {:ok, %Codec{}} | {:error, :unsupported_codec} ``` @@ -242,11 +243,12 @@ def __codec_info__ do %ExCodecs.Codec{ name: :zstd, category: :compression, + interface: :binary, module: __MODULE__, native?: true, - streaming?: true, + streaming?: false, configurable?: true, - version: "1.5.6" + version: "structured-zstd-0.0.48" } end ``` @@ -257,6 +259,7 @@ The `%ExCodecs.Codec{}` struct fields: |-----------------|-------------------|-------------------------------------------------| | `name` | `atom()` | The codec's registry key | | `category` | `atom()` | Category (`:compression`, `:hashing`, etc.) | +| `interface` | `:binary \| :spatial` | Operation API shape | | `module` | `module() \| nil` | The implementing module, or nil if unavailable | | `native?` | `boolean()` | Whether the codec uses a NIF | | `streaming?` | `boolean()` | Whether the codec supports streaming | @@ -270,7 +273,7 @@ that add complexity without benefit. Instead, the registry probes for the function with `function_exported?/3`: ```elixir -defp build_codec_info(name, module, category) do +defp build_codec_info(name, module, category, interface, metadata) do info = if function_exported?(module, :__codec_info__, 0) do module.__codec_info__() @@ -281,11 +284,12 @@ defp build_codec_info(name, module, category) do %ExCodecs.Codec{ name: name, category: category, + interface: interface, module: module, - native: Map.get(info, :native?, true), - streaming?: Map.get(info, :streaming?, false), - configurable?: Map.get(info, :configurable?, false), - version: Map.get(info, :version) + native?: Keyword.get(metadata, :native?, info.native?), + streaming?: Keyword.get(metadata, :streaming?, info.streaming?), + configurable?: Keyword.get(metadata, :configurable?, info.configurable?), + version: Keyword.get(metadata, :version, info.version) } end ``` @@ -338,7 +342,7 @@ defmodule ExCodecs.Native do end ``` -The native crate is pure Rust (ruzstd, lz4_flex, snap, flate2 rust backend, +The native crate is pure Rust (structured-zstd, lz4_flex, snap, flate2 rust backend, libbz2-rs) — no C compression libraries. Each NIF function has a fallback that returns `:erlang.nif_error(:nif_not_loaded)`: @@ -448,15 +452,15 @@ strip = true ## Runtime Codec Discovery -The `ExCodecs.CodecRegistry` is an ETS-backed Agent that maps codec names -to their implementations and metadata. +The `ExCodecs.CodecRegistry` is an ETS-backed Agent that serves as the shared +catalog for binary and spatial codec names, implementations, and metadata. ### Why ETS? ETS offers O(1) lookups for `set`-type tables. Codec resolution happens on -every `encode`/`decode` call, so the registry must be fast. A GenServer with -a map would serialize all codec lookups through a single process; ETS allows -concurrent reads without bottlenecks. +binary and spatial encode/decode calls, so the catalog must be fast. A +GenServer with a map would serialize all lookups through a single process; ETS +allows concurrent reads without bottlenecks. ### Registry data model @@ -471,12 +475,13 @@ Example entries: ```elixir {:zstd, {ExCodecs.Compression.Zstd, :compression, %Codec{name: :zstd, ...}}} {:lz4, {ExCodecs.Compression.Lz4, :compression, %Codec{name: :lz4, ...}}} +{:ply, {ExCodecs.Spatial.Codec.PLY, :spatial, %Codec{name: :ply, interface: :spatial, ...}}} {:sha256, {nil, :hashing, %Codec{name: :sha256, module: nil, ...}}} # unavailable ``` -When a codec's NIF fails to load, the module field is `nil` and the codec is -registered as unavailable. Calls to `encode`/`decode` with an unavailable -codec return `{:error, %ExCodecs.Error{reason: :codec_unavailable}}`. +When an implementation cannot load, the module field is `nil` and the codec is +registered as unavailable. Calls through its category API return +`{:error, %ExCodecs.Error{reason: :codec_unavailable}}`. ### Discovery flow @@ -492,7 +497,11 @@ codec return `{:error, %ExCodecs.Error{reason: :codec_unavailable}}`. +---> {:ok, {ExCodecs.Compression.Zstd, :compression, info}} | | | v - | info.module != nil? --> yes --> module.encode(data, opts) + | info.interface == :binary and module != nil? + | | + | yes --> module.encode(data, opts) + | + +---> spatial interface --> return category-API guidance | +---> {:error, :unsupported_codec} | @@ -504,17 +513,23 @@ codec return `{:error, %ExCodecs.Error{reason: :codec_unavailable}}`. ```elixir # List all codecs with available implementations -ExCodecs.available_codecs() #=> [:bzip2, :blosc2, :lz4, :snappy, :zstd] +ExCodecs.available_codecs() #=> [:blosc2, ..., :gsplat, :ply, ..., :zstd] + +# Filter available names by category +ExCodecs.available_codecs(:spatial) #=> [:gsplat, :ply, :spatial_binary] # List all registered codecs (including unavailable) -ExCodecs.CodecRegistry.all_codecs() #=> [:blosc2, :bzip2, :lz4, :sha256, :snappy, :zstd] +ExCodecs.CodecRegistry.all_codecs() #=> [:blosc2, ..., :ply, :sha256, ..., :zstd] # Check if a specific codec is available ExCodecs.supports?(:zstd) #=> true # Get detailed metadata ExCodecs.codec_info(:zstd) -#=> {:ok, %Codec{name: :zstd, category: :compression, native?: true, ...}} +#=> {:ok, %Codec{name: :zstd, category: :compression, interface: :binary, ...}} + +ExCodecs.codec_info(:ply) +#=> {:ok, %Codec{name: :ply, category: :spatial, interface: :spatial, ...}} # Filter by category ExCodecs.Compression.available_codecs() @@ -710,13 +725,19 @@ predictable and navigable. --- -## Future Categories +## Codec Categories ### Spatial (implemented in 0.2.0) Spatial codecs map structured geometric types to interchange formats. They are -pure Elixir and live under `ExCodecs.Spatial` rather than the binary-only -`ExCodecs.Codec` behaviour used by compression. +pure Elixir and use the specialized `ExCodecs.Spatial` API rather than forcing +structs through the binary-only `ExCodecs.Codec` callbacks. They are registered +in the shared catalog with `category: :spatial` and `interface: :spatial`. + +`ExCodecs.available_codecs/0` lists all available entries, +`ExCodecs.available_codecs(:spatial)` filters the shared catalog, and +`ExCodecs.Spatial.available_formats/0` presents spatial formats in the +category's preferred built-in order. | Format | Module | |-------------------|-------------------------------------| @@ -807,7 +828,8 @@ codec, then assembles the result according to the CID specification. --- -The architecture described here is built to accommodate all of these categories -without API changes. Every new codec, regardless of category, implements the -same two-callback behaviour, registers in the same ETS table, and is queried -through the same five public functions. \ No newline at end of file +The architecture described here accommodates categories through specialized +entry points under one framework. Binary-shaped categories can reuse +`ExCodecs.Codec` and the ETS registry; domain-shaped categories may define +their own behaviour and discovery while preserving common result, error, and +documentation conventions. \ No newline at end of file diff --git a/docs/spatial_formats.md b/docs/spatial_formats.md new file mode 100644 index 0000000..4fc83f5 --- /dev/null +++ b/docs/spatial_formats.md @@ -0,0 +1,116 @@ +# Spatial wire formats (v0.2.0 freeze) + +This document freezes the on-wire layouts used by `ExCodecs.Spatial` in **v0.2.0**. +A future Rust backend (v0.2.1) must produce **byte-compatible** output for these +formats. There is **no CRC / checksum** in v1; integrity is the caller's responsibility. + +Attribute keys on points are **strings** after construction / decode. Prefer string +keys when building clouds for cross-backend compatibility. + +## One framework, specialized category APIs + +| Category | Entry point | Discovery | +|----------|-------------|-----------| +| Registry binary codecs (`:zstd`, …) | `ExCodecs.encode/3`, `decode/3` | `available_codecs(:compression)` | +| Spatial domain codecs | `ExCodecs.Spatial.encode/2`, `decode/2` | `available_codecs(:spatial)` or `ExCodecs.Spatial.available_formats/0` | + +Both categories belong to the ExCodecs framework and share its tagged-result +and error conventions. Their entry points differ because registry codecs map +binary↔binary, while spatial codecs map domain structs↔formats. + +Spatial formats (`:ply`, `:spatial_binary`, `:gsplat`) are entries in the same +ETS-backed catalog as compression codecs. Their metadata has +`category: :spatial` and `interface: :spatial`; that interface marker keeps +operation dispatch on `ExCodecs.Spatial` rather than the binary API. + +## PLY (`format: :ply`) + +Standard PLY interchange (ASCII or binary little/big endian). Gaussian PLY uses +common property names (`f_dc_*`, `opacity`, `scale_*`, `rot_*`, `f_rest_*`). + +Encode options (after Spatial selects `:ply`): + +- `:ply_format` or `:format` — `:ascii` (default), `:binary` / `:binary_le`, `:binary_be` +- `:comments` — header comments +- `:as` — decode as `:auto`, `:point_cloud`, or `:gaussian_cloud` + +### Schema promotion + +If **any** point in a cloud has color / alpha / normals, the schema includes those +properties for **all** points. Missing values are defaulted (RGB `0`, alpha `255`, +normal `{0,0,0}`). Mixed optional fields therefore round-trip with defaults filled in. + +### Streaming + +`stream_decode` / `stream_encode` currently **materialize** the full payload (or +enumerable) then enumerate. Prefer explicit `source: :file` or `source: :binary` +when the argument is ambiguous. + +`:auto` treats a binary as a path only when it looks path-like (under 4 KiB, no +`ply`/`EXCP`/`GSPL` magic, and contains `/` or `\` or ends with `.ply`/`.excp`/ +`.gspl`/`.bin`) **and** `File.regular?/1` is true. Edge cases: + +- A real file with no separator/extension is **not** auto-opened. +- A short binary containing `/` that happens to be a regular file path **is** opened. + +## EXCP — `:spatial_binary` (version 1) + +Little-endian compact point clouds. + +``` +Offset Size Field +0 4 magic "EXCP" +4 2 version u16 LE (= 1) +6 2 flags u16 LE +8 8 count u64 LE +16 … records +``` + +**Flags** + +| Bit | Meaning | +|-----|---------| +| 0 | color (RGB u8 × 3) | +| 1 | alpha (RGBA; implies color bytes include alpha) | +| 2 | normals (f32 × 3) | + +**Record order:** `x,y,z` as `f32` LE, then optional color bytes, then optional +normals. Flags are global for the file; points missing a promoted field are +zero-filled (alpha default 255). + +**Not stored:** generic attributes, bounds, transform, metadata. Trailing bytes +after `count` records are ignored. Truncation yields `:invalid_data` / +`:truncated_input` as implemented. + +## GSPL — `:gsplat` (version 1) + +Little-endian compact Gaussian clouds. + +``` +Offset Size Field +0 4 magic "GSPL" +4 2 version u16 LE (= 1) +6 2 flags u16 LE (bit0 set when SH rest present) +8 8 count u64 LE +16 2 sh_rest u16 LE (floats of SH rest per Gaussian; 0 if none) +18 … records +``` + +**Record (always):** 14 × `f32` LE — + +1. position XYZ (3) +2. DC color RGB (3) — maps to `Gaussian.color` +3. opacity (1) +4. scale XYZ (3) +5. rotation quaternion WXYZ (4) + +Then `sh_rest` × `f32` LE (shared length for all Gaussians; shorter lists padded +with zeros on encode). + +**Not stored:** per-Gaussian metadata maps, cloud metadata. Flags on decode are +currently informational; `sh_rest` count in the header is authoritative. + +## Integrity + +v1 formats have **no checksum**. For integrity, wrap payloads with a registry +codec (e.g. compress after encode) or store an external hash. diff --git a/guides/choosing_compression_codec.md b/guides/choosing_compression_codec.md index ea02207..f5cc924 100644 --- a/guides/choosing_compression_codec.md +++ b/guides/choosing_compression_codec.md @@ -2,19 +2,59 @@ This guide helps you select the right compression codec for your use case. It includes a comparison table, decision criteria, and worked examples. +> ### Is the data spatial—or spatially representable? +> +> Compression codecs operate on arbitrary binaries. If records represent +> coordinates, points, normals, colors, oriented particles, or Gaussian splats, +> consider converting them to `ExCodecs.Spatial` types first—even when the +> source is currently a flat array, CSV rows, maps, or database records. +> +> Use: +> +> - `ExCodecs.Spatial.PointCloud` for XYZ, XYZRGB(A), normals, and scalar +> per-point attributes. +> - `ExCodecs.Spatial.GaussianCloud` for position, scale, rotation, opacity, +> color, and spherical harmonics. +> - `:ply` for interoperable spatial exchange. +> - `:spatial_binary` (EXCP) for compact point clouds. +> - `:gsplat` (GSPL) for compact Gaussian clouds. +> +> Spatial encoding and compression are complementary. Encode the structured +> data first, then optionally compress the resulting binary: +> +> ```elixir +> alias ExCodecs.Spatial.{Point, PointCloud} +> +> cloud = +> rows +> |> Enum.map(fn %{x: x, y: y, z: z} -> Point.new(x, y, z) end) +> |> PointCloud.new() +> +> {:ok, spatial_binary} = +> ExCodecs.Spatial.encode(cloud, format: :spatial_binary) +> +> {:ok, compressed} = ExCodecs.encode(:zstd, spatial_binary, level: 3) +> ``` +> +> If the numbers have no geometric meaning and only need compact storage, +> Blosc2 may be a better fit. See +> [Understanding Spatial Codecs](understanding_spatial_codecs.md) and +> [Spatial Wire Formats](../docs/spatial_formats.md). + ## Quick Comparison | Codec | Compression Ratio | Compression Speed | Decompression Speed | Memory Usage | Configurable | Streaming | Best For | |----------|-------------------|-------------------|---------------------|--------------|--------------|-----------|-----------------------------------| -| LZ4 | Low | Very Fast | Very Fast | Very Low | Level 1-16 | No | Real-time, latency-sensitive | +| LZ4 | Low | Very Fast | Very Fast | Very Low | No | No | Real-time, latency-sensitive | | Snappy | Low | Very Fast | Very Fast | Very Low | No | No | Short-lived data, RPC payloads | -| Zstd | High | Fast | Very Fast | Moderate | Level 1-22 | Yes | General purpose, storage, network | +| Zstd | High | Fast | Very Fast | Moderate | Levels 1-22 | No | General purpose, storage, network | | Bzip2 | Very High | Slow | Slow | Moderate | Block 1-9 | No | Archival, offline processing | -| Blosc2 | High* | Fast | Very Fast** | Configurable | Extensive | Yes | Numerical arrays, typed data | +| Blosc2 | High* | Fast | Very Fast | Moderate | Codec/level/shuffle/typesize | No | Numerical arrays, typed data | \* Blosc2 ratio depends heavily on the internal codec (`cname`) and shuffle settings. With byte shuffle on typed data, ratios can exceed Zstd. -\** Blosc2 decompression is fast because it can skip the decompression of unused blocks. +“Streaming” here means an incremental compression API. All current compression +codecs operate on complete input buffers. ## Decision Framework @@ -22,8 +62,11 @@ Answer the following questions to narrow your choice: ### 1. What is your data type? +- **Coordinates, point samples, particles, normals, or Gaussian splats** -- + model them with `ExCodecs.Spatial`, even if they currently arrive as arrays, + rows, maps, or CSV. Optionally compress the encoded PLY/EXCP/GSPL binary. - **Text, JSON, logs, general-purpose binary** -- Zstd is the best default. Use level 3 for a balance of speed and ratio. -- **Typed numerical arrays (floats, integers, matrices)** -- Blosc2 with appropriate `typesize` and `shuffle` settings. +- **Typed numerical arrays without spatial semantics (floats, integers, matrices)** -- Blosc2 with appropriate `typesize` and `shuffle` settings. - **Short-lived messages, RPC payloads** -- Snappy or LZ4 for minimal latency. - **Archival storage** -- Bzip2 for maximum ratio, or Zstd at level 19-22 for high ratio with better decompression speed. @@ -43,7 +86,7 @@ Answer the following questions to narrow your choice: - **Very constrained (embedded, large concurrent load)** -- LZ4 or Snappy. - **Moderate** -- Zstd at levels 1-14. -- **Available** -- Zstd at levels 15-22, Bzip2 at block sizes 7-9, Blosc2 multi-threaded. +- **Available** -- Zstd at levels 15-22 or Bzip2 at block sizes 7-9. ### 5. Is data read once or many times? @@ -57,9 +100,9 @@ Answer the following questions to narrow your choice: ```elixir {:ok, compressed} = ExCodecs.encode(:lz4, data) -{:ok, compressed} = ExCodecs.encode(:lz4, data, level: 4) ``` +- ExCodecs exposes one fixed, fast LZ4 profile; it does not accept `:level`. - Low-latency message queues - Real-time data pipelines where throughput matters more than size - Temporary data that will be decompressed quickly @@ -87,7 +130,8 @@ Answer the following questions to narrow your choice: - Databases, file storage, and network transmission - Workloads where decompression speed matters (Zstd decompresses fast regardless of compression level) - When you need a configurable tradeoff (22 levels from fast to maximum ratio) -- Dictionary compression for small, repetitive payloads + +ExCodecs does not currently expose Zstd dictionary compression. ### When to Use Bzip2 @@ -109,9 +153,11 @@ Answer the following questions to narrow your choice: - Numerical arrays (float64, int32, etc.) - Scientific data, time series, matrix storage - Situations where shuffle filters provide a significant ratio improvement -- Multi-threaded compression/decompression of large buffers - When you need fine-grained control over the compression pipeline +Each Blosc2 NIF call is single-threaded (`nthreads: 1`). Parallelize independent +buffers with BEAM processes. + ## Worked Examples ### Example 1: API Response Cache @@ -134,13 +180,14 @@ Rationale: Zstd decompresses quickly regardless of compression level, so invest Messages arrive at high volume and must be forwarded with minimal latency. -**Choice: LZ4 at level 1** +**Choice: LZ4** ```elixir -{:ok, compressed} = ExCodecs.encode(:lz4, message, level: 1) +{:ok, compressed} = ExCodecs.encode(:lz4, message) ``` -Rationale: Latency is the priority. LZ4 at level 1 provides compression at over 500 MB/s, adding negligible overhead to the pipeline. +Rationale: Latency is the priority. ExCodecs' fixed fast LZ4 profile adds +minimal overhead to the pipeline. ### Example 3: Scientific Data Archive @@ -153,8 +200,7 @@ A research pipeline archives float64 measurement arrays to cold storage. cname: :zstd, clevel: 9, shuffle: :byte, - typesize: 8, - numthreads: 4 + typesize: 8 ) ``` @@ -191,10 +237,11 @@ Rationale: Protobuf already removes much redundancy. Snappy adds minimal overhea | Use Case | Recommended Codec | Configuration | |------------------------------|-------------------|-------------------------------------| | General-purpose default | Zstd | `level: 3` | -| Real-time / low-latency | LZ4 | `level: 1` | +| Real-time / low-latency | LZ4 | No codec-specific options | | Fastest with no config | Snappy | (none) | | Maximum ratio / archival | Bzip2 or Zstd | `block_size: 9` or `level: 19-22` | | Numerical arrays | Blosc2 | `cname: :zstd, shuffle: :byte` | -| Small repetitive payloads | Zstd | `level: 3` with dictionary | -| In-memory cache | LZ4 or Snappy | `level: 1` or (none) | -| Already slightly compressed | Snappy or LZ4 | Lowest level to avoid wasted CPU | \ No newline at end of file +| Spatially meaningful records | Spatial + optional compression | PLY/EXCP/GSPL, then optionally Zstd | +| Small repetitive payloads | Zstd | `level: 3` (dictionary API unavailable) | +| In-memory cache | LZ4 or Snappy | No codec-specific options | +| Already slightly compressed | Snappy or LZ4 | No codec-specific options | \ No newline at end of file diff --git a/guides/codec_fundamentals.md b/guides/codec_fundamentals.md index 205c39e..0e85b4b 100644 --- a/guides/codec_fundamentals.md +++ b/guides/codec_fundamentals.md @@ -100,9 +100,9 @@ def __codec_info__ do category: :compression, module: __MODULE__, native?: true, - streaming?: true, + streaming?: false, configurable?: true, - version: "1.5.6" + version: "structured-zstd-0.0.48" } end ``` @@ -115,7 +115,7 @@ The `%ExCodecs.Codec{}` struct contains: | `category` | `atom()` | Category (e.g., `:compression`) | | `module` | `module() \| nil` | Implementing module, or `nil` if unavailable | | `native?` | `boolean()` | Whether a native NIF implementation exists | -| `streaming?` | `boolean()` | Whether the codec supports streaming operation | +| `streaming?` | `boolean()` | Whether an incremental encode/decode API is exposed | | `configurable?` | `boolean()` | Whether the codec accepts configuration options | | `version` | `String.t() \| nil` | Library version string | diff --git a/guides/runtime_codec_discovery.md b/guides/runtime_codec_discovery.md index 64d53fb..ae15256 100644 --- a/guides/runtime_codec_discovery.md +++ b/guides/runtime_codec_discovery.md @@ -1,6 +1,9 @@ # Runtime Codec Discovery -ExCodecs uses a runtime registry to discover, validate, and query available codecs. This guide explains how the registry works, how it enables graceful degradation, and how to extend it with custom codecs. +ExCodecs uses a shared runtime catalog to discover, validate, and query binary +and spatial codecs. This guide explains how the ETS-backed registry works, how +it enables graceful degradation, and how to extend it with custom binary +codecs. ## The Codec Registry @@ -73,7 +76,10 @@ For an unavailable codec: The distinction between "known but unavailable" and "unknown" is important: -- **Known but unavailable**: The codec is registered in the table with `module: nil`. This means the native NIF could not be loaded (e.g., unsupported platform, missing native library). `supports?/1` returns `false`, but `codec_info/1` still returns the metadata. +- **Known but unavailable**: The codec is registered in the table with + `module: nil`. Its implementation could not be loaded (for compression this + commonly means the native NIF is unavailable). `supports?/1` returns + `false`, but `codec_info/1` still returns metadata. - **Unknown**: The codec name is not in the table at all. `lookup/1` returns `{:error, :unsupported_codec}`. @@ -81,11 +87,17 @@ The distinction between "known but unavailable" and "unknown" is important: ### Available Codecs -List all codecs that are loaded and functional: +List all catalog entries that are loaded and functional: ```elixir ExCodecs.available_codecs() +# => [:blosc2, :bzip2, :gsplat, :lz4, :ply, :snappy, :spatial_binary, :zstd] + +ExCodecs.available_codecs(:compression) # => [:blosc2, :bzip2, :lz4, :snappy, :zstd] + +ExCodecs.available_codecs(:spatial) +# => [:gsplat, :ply, :spatial_binary] ``` This filters out codecs where the module is `nil` (unavailable). Only codecs you can actually use are included. @@ -116,16 +128,17 @@ end # => %ExCodecs.Codec{ # name: :zstd, # category: :compression, +# interface: :binary, # module: ExCodecs.Compression.Zstd, # native?: true, -# streaming?: true, +# streaming?: false, # configurable?: true, -# version: "1.5.6" +# version: "structured-zstd-0.0.48" # } -info.streaming? # => true +info.streaming? # => false info.configurable? # => true -info.version # => "1.5.6" +info.version # => "structured-zstd-0.0.48" ``` This is useful for checking codec capabilities: @@ -146,7 +159,9 @@ ExCodecs.Compression.available_codecs() # => [%ExCodecs.Codec{name: :blosc2, ...}, %ExCodecs.Codec{name: :bzip2, ...}, ...] ``` -Currently, all codecs are in the `:compression` category, but the architecture supports future categories (hashing, checksums, encodings). +Built-ins currently occupy `:compression` and `:spatial`. The `interface` +metadata records whether operations use the top-level binary API or the +specialized spatial API. ### Direct Lookup @@ -305,11 +320,12 @@ The registry distinguishes between "all registered codecs" and "available codecs ```elixir # All codecs known to the registry (including unavailable ones) ExCodecs.CodecRegistry.all_codecs() -# => [:blosc2, :bzip2, :lz4, :snappy, :zstd] +# => [:blosc2, :bzip2, :gsplat, :lz4, :ply, :snappy, :spatial_binary, :zstd] -# Only codecs whose NIF is loaded and functional +# Only entries whose implementation is loaded and functional ExCodecs.CodecRegistry.available_codecs() -# => [:bzip2, :lz4, :snappy, :zstd] # (blosc2 unavailable in this example) +# => [:bzip2, :gsplat, :lz4, :ply, :snappy, :spatial_binary, :zstd] +# (:blosc2 is unavailable in this example) ``` The set of available codecs may change if the NIF is reloaded. In normal operation, once the NIF loads successfully, all built-in codecs are available. diff --git a/guides/understanding_blosc2.md b/guides/understanding_blosc2.md index 102c391..a3f0e36 100644 --- a/guides/understanding_blosc2.md +++ b/guides/understanding_blosc2.md @@ -11,7 +11,7 @@ ExCodecs implements **C-Blosc2-compatible chunks** only (pure Rust via **Standalone Snappy** remains `ExCodecs.encode(:snappy, data)`. -Blosc2 is a meta-compressor designed for high-performance compression of binary data, especially numerical arrays. This guide explains how Blosc2 works, its unique features (shuffle filters, internal codecs, multi-threading), and how to use it effectively in ExCodecs. +Blosc2 is a meta-compressor designed for high-performance compression of binary data, especially numerical arrays. This guide explains how Blosc2 works, its shuffle filters and internal codecs, and how to use it effectively in ExCodecs. ## Overview @@ -36,7 +36,7 @@ Blosc2 processes data in a pipeline: Input Binary | v -[1] Split into blocks (blocksize or auto) +[1] Split into internally selected blocks | v [2] Apply shuffle filter (none / byte / bit) @@ -45,7 +45,7 @@ Input Binary [3] Compress each block with internal codec | v -[4] Assemble Blosc2 frame header + compressed blocks +[4] Assemble one Blosc2 chunk | v Output Binary @@ -54,10 +54,10 @@ Output Binary Decompression reverses the pipeline: ``` -Input Binary (Blosc2 frame) +Input Binary (Blosc2 chunk) | v -[1] Parse frame header +[1] Parse chunk header | v [2] Decompress each block with internal codec @@ -74,13 +74,12 @@ Output Binary (original) ### Step 1: Block Splitting -Blosc2 splits the input into blocks of configurable size. Smaller blocks enable: +Blosc2 chunks split input into internal blocks. In the wider Blosc2 ecosystem, +blocks can support parallel or partial processing. ExCodecs currently exposes +neither block-size selection nor block-level access; the implementation chooses +the block layout and decodes the complete chunk. -- Parallel processing (different blocks on different threads). -- Partial decompression (read only the blocks you need). -- Better cache utilization during compression. - -The `blocksize` parameter controls this. A value of `0` lets Blosc2 choose automatically based on the input size and number of threads. +Blocks still improve cache utilization inside compression. ### Step 2: Shuffle Filters @@ -117,22 +116,19 @@ Each (possibly shuffled) block is compressed using one of several codecs: | `:blosclz` | BloscLZ (C-Blosc2 pure-Rust port) | Very Fast | Moderate | | `:lz4` | LZ4 (default) | Very Fast | Moderate | | `:lz4hc` | LZ4 high compression | Moderate | Good | -| `:snappy` | Snappy | Very Fast | Low-Moderate | | `:zstd` | Zstandard | Fast | High | | `:zlib` | Zlib (Deflate) | Moderate | Good | The choice of internal codec determines the speed/ratio tradeoff within each block. Blosc2 adds the shuffle filtering on top, so the effective ratio can be much higher than using the same codec directly. -### Step 4: Frame Assembly +### Step 4: Chunk Assembly -Blosc2 assembles the compressed blocks into a frame with a header containing: +Blosc2 assembles the compressed blocks into a chunk with metadata including: - The decompressed size. - The block size. - The internal codec, compression level, and shuffle mode. - The element typesize. -- The number of threads used. -- Checksums for data integrity. This header allows decompression without any external metadata. @@ -178,18 +174,20 @@ This header allows decompression without any external metadata. ) ``` -### Multi-Threaded Compression +### Single-threaded chunk compression ```elixir {:ok, compressed} = ExCodecs.encode(:blosc2, data, cname: :lz4, clevel: 5, shuffle: :byte, - typesize: 8, - numthreads: 4 + typesize: 8 ) ``` +The current NIF always uses one Blosc2 worker (`nthreads: 1`) on a BEAM +DirtyCpu scheduler. `:numthreads` is not a public option. + ## Configuration Options | Option | Type | Default | Description | @@ -197,9 +195,7 @@ This header allows decompression without any external metadata. | `:cname` | atom | `:lz4` | Internal compressor (`:blosclz`, `:lz4`, `:lz4hc`, `:zstd`, `:zlib`) | | `:clevel` | integer (0-9) | 5 | Compression level (0 = no compression) | | `:shuffle` | atom | `:byte` | Shuffle filter (`:none`, `:byte`, `:bit`) | -| `:typesize` | integer (1-256) | 8 | Element size in bytes for shuffle | -| `:blocksize` | integer | 0 | Block size in bytes (0 = automatic) | -| `:numthreads`| integer | 1 | Number of threads for parallel compression | +| `:typesize` | integer (1-255) | 8 | Element size in bytes for shuffle | ### Choosing `cname` (Internal Codec) @@ -207,9 +203,11 @@ This header allows decompression without any external metadata. - **`:zstd`**: Best ratio when combined with shuffle. Use `:zstd` with `clevel: 5-9` for maximum compression of numerical data. - **`:lz4hc`**: Higher ratio than `:lz4`, slower compress. - **`:blosclz`**: Blosc’s own LZ codec (included for C-Blosc2 interop). -- **`:snappy`**: Fastest, lowest ratio. Rarely the best choice since `:lz4` is fast and better. - **`:zlib`**: Moderate speed, good ratio. Available for compatibility. +`cname: :snappy` is rejected. Use the standalone registry codec +`ExCodecs.encode(:snappy, data)` instead. + ### Choosing `shuffle` - **`:byte`** (default): Best for most typed data. Groups bytes by position within each element. Recommended for float64, int32, and similar numeric types. @@ -247,50 +245,25 @@ Setting `typesize: 8` with `shuffle: :byte` on float64 arrays typically provides With `clevel: 0`, Blosc2 applies the shuffle filter but does not compress. This is useful when you want the reordering benefit without compression, or as a diagnostic to see how much shuffle alone helps. -### Choosing `numthreads` - -- **1** (default): Single-threaded. No thread overhead. Best for small data. -- **2-4**: Good for medium-sized data on multi-core systems. -- **8+**: Best for large data (100 MB+) on servers with many cores. +### Threading -Multi-threading works by splitting the input into blocks and compressing each block in a separate thread. The overhead of thread creation and synchronization means multi-threading only helps when the data is large enough to amortize this cost. - -On the BEAM, NIFs run on DirtyCpu schedulers. Compression uses a pure-Rust -C-Blosc2-compatible chunk implementation (`blosc2-pure-rs`) with `nthreads: 1` -so work stays on the DirtyCpu scheduler (no extra Rayon pool from the NIF). +On the BEAM, the NIF runs on a DirtyCpu scheduler. The pure-Rust +C-Blosc2-compatible chunk implementation uses `nthreads: 1`; ExCodecs does not +create an extra native thread pool. Run independent codec calls concurrently +from separate BEAM processes when workload-level parallelism is needed. Wire format is a **Blosc2 chunk** (not super-chunk / B2ND / `.b2frame`). Fixtures under `test/fixtures/blosc2/` are produced with python-blosc2. -## The Blosc2 Frame Format - -A Blosc2 compressed frame has the following structure: +## The Blosc2 Chunk Format -``` -+----------+-----------+---------+-----------+----------+ -| Header | Extended | Block 0 | Block 1 | Block N | -| (16+ B) | Header | | | | -+----------+-----------+---------+-----------+----------+ -``` +ExCodecs produces one C-Blosc2-compatible **chunk** per call. The chunk carries +the decompressed size, compressed size, block size, typesize, codec, level, and +filter metadata required for full-buffer decompression. -The header contains: -- Magic number and version -- Decompressed size -- Compressed size -- Block size -- Typesize -- Codec, compression level, and shuffle mode -- Number of threads -- Filter pipeline information - -Each block contains: -- Block header (compressed size, decompressed size) -- Compressed data - -This format enables: -- **Partial decompression**: Read and decompress specific blocks without processing the entire frame. -- **Multi-threaded decompression**: Decompress blocks in parallel. -- **Metadata**: All parameters needed for decompression are in the header. +The public API only performs complete chunk decompression. It does **not** +expose partial block reads, super-chunks, B2ND arrays, `.b2frame` containers, +or configurable native decompression threads. ## When to Use Blosc2 @@ -299,13 +272,13 @@ This format enables: - **Data is numerical arrays.** Float64, int32, and other typed data benefit enormously from shuffle filters. - **You need fine-grained control.** Blosc2 offers the most parameters of any codec in ExCodecs. - **Data has regular element structure.** If data length is a multiple of a known typesize, Blosc2 can exploit this. -- **You want multi-threaded compression.** Blosc2 is the only codec with multi-threading support. -- **You need partial decompression.** The block structure enables reading specific blocks. +- **You need C-Blosc2 chunk interoperability.** ExCodecs chunks interoperate + with single-buffer C/Python Blosc2 compression APIs. ### Consider Alternatives When - **Data is unstructured binary.** If there is no regular element structure, the shuffle filter provides no benefit, and Zstd or LZ4 directly may be simpler. -- **Data is small.** Blosc2's frame header overhead makes it less efficient for data under 256 bytes. +- **Data is small.** Blosc2's chunk-header overhead makes it less efficient for data under 256 bytes. - **You want simplicity.** Blosc2 has many configuration knobs. Zstd with `level: 3` is simpler and effective for most data. ## Ratio Improvement from Shuffle @@ -327,10 +300,11 @@ For numerical data, the improvement from shuffle is dramatic and consistent. The |--------------------|-------------------|----------------|----------------| | Category | Meta-compressor | Algorithm | Algorithm | | Shuffle Filters | Yes (byte, bit) | No | No | -| Inner Codecs | 6 options | N/A | N/A | -| Multi-threading | Yes | No | No | +| Inner Codecs | 5 options | N/A | N/A | +| Incremental API | No | No | No | +| Per-call threading | Single-threaded | Single-threaded| Single-threaded| | Best For | Numerical arrays | General data | Speed | -| Configuration | Extensive | Level + window | Level | +| Configuration | Codec/level/shuffle/typesize | Level 1-22 | None | ## Best Practices @@ -342,7 +316,8 @@ For numerical data, the improvement from shuffle is dramatic and consistent. The 4. **Start with `cname: :lz4, clevel: 5` for speed, or `cname: :zstd, clevel: 5` for ratio.** These are the most commonly useful configurations. -5. **Use `numthreads > 1` only for data over 1 MB.** Thread overhead makes multi-threading counterproductive for small data. +5. **Parallelize independent calls with BEAM processes.** Each NIF call is + single-threaded and runs on a DirtyCpu scheduler. 6. **Benchmark with your actual data.** The effectiveness of shuffle depends heavily on the data. Always measure, do not guess. diff --git a/guides/understanding_lz4.md b/guides/understanding_lz4.md index 15bc076..55ad408 100644 --- a/guides/understanding_lz4.md +++ b/guides/understanding_lz4.md @@ -9,7 +9,7 @@ LZ4 was created by Yann Collet (the same author as Zstd) and is focused on extre - Compression speeds over 500 MB/s per core. - Decompression speeds over 2 GB/s per core. - A simple, well-defined block format. -- Configurable compression levels (1-16) via LZ4 HC. +- A fixed fast-compression profile in ExCodecs. LZ4 achieves this speed by using a simple hash table for match finding and avoiding computationally expensive entropy coding. The tradeoff is a lower compression ratio compared to Zstd or Bzip2. @@ -36,29 +36,18 @@ Unlike Zstd or Deflate, LZ4 does **not** perform: This simplicity is what makes LZ4 fast. The compressed data is essentially a stream of "copy these literal bytes, then copy `length` bytes from `offset` back." -## Compression Levels +## Configuration -With the `lz4_flex` Rust crate, LZ4 offers levels 1-16 through the HC (Higher Compression) variant: - -| Level | Speed | Ratio | Use Case | -|-------|------------------|----------|----------------------------------| -| 1 | Very Fast (500+ MB/s) | Moderate | Default, real-time systems | -| 4-8 | Fast (200-400 MB/s) | Good | Slightly more compression needed | -| 9-12 | Moderate | Better | When ratio matters more than speed| -| 13-16 | Slow | Best | Maximum LZ4 ratio | +The ExCodecs LZ4 codec uses `lz4_flex` fast block compression and does **not** +expose compression levels or LZ4 HC. Pass no codec-specific encode options: ```elixir -# Default (fastest) {:ok, compressed} = ExCodecs.encode(:lz4, data) - -# Higher level for better ratio -{:ok, compressed} = ExCodecs.encode(:lz4, data, level: 9) - -# Maximum LZ4 compression (still faster than Zstd level 1) -{:ok, compressed} = ExCodecs.encode(:lz4, data, level: 16) ``` -Even at level 16, LZ4 HC is typically faster than Zstd at level 1, though Zstd achieves better ratios at all levels. +If you need a configurable speed/ratio tradeoff, use Zstd. If you need an +LZ4-family codec with a higher-compression profile, Blosc2 supports +`cname: :lz4hc` and `clevel: 0..9`. ## The LZ4 Block Format @@ -95,7 +84,7 @@ This format is simple to parse, which contributes to LZ4's fast decompression sp ### Compression Speed -LZ4 at level 1 compresses at 500+ MB/s on modern hardware. This means: +LZ4's fixed fast profile can compress at 500+ MB/s on modern hardware. This means: - A 1 MB payload compresses in under 2 ms. - A 10 MB payload compresses in under 20 ms. @@ -144,10 +133,10 @@ LZ4 and Snappy occupy a similar niche (fast, low-ratio compression). Key differe | Property | LZ4 | Snappy | |-------------------|-------------------------------|-------------------------------| -| Compression Speed | ~500 MB/s (level 1) | ~500 MB/s | +| Compression Speed | ~500 MB/s (fixed fast profile)| ~500 MB/s | | Decompression Speed | ~2 GB/s | ~1.5 GB/s | | Compression Ratio | Moderate (better than Snappy)| Slightly lower | -| Configurable | Yes (16 levels) | No | +| Configurable | No | No | | Format | LZ4 block format | Snappy framework format | | Deterministic | Yes | Yes | @@ -161,14 +150,15 @@ LZ4 generally offers better ratio at comparable speeds, while Snappy has a simpl | Decompression Speed| Faster | Fast | | Ratio | Moderate | High | | Window Size | 64 KB (fixed) | Up to 8 MB+ (configurable) | -| Dictionary | No | Yes | -| Configurable | 1-16 | 1-22 | +| Dictionary | No | Not exposed by ExCodecs | +| Configurable | No | Levels 1-22 | LZ4 is the right choice when speed is the primary concern. Zstd is the right choice when ratio matters or when you need fine-grained control over the speed/ratio tradeoff. ## Best Practices -1. **Use level 1 by default.** Higher LZ4 levels improve ratio but reduce speed. If ratio matters, consider switching to Zstd instead. +1. **Use LZ4 without level options.** ExCodecs exposes its fixed fast profile. + If ratio matters, consider Zstd or Blosc2 with `cname: :lz4hc`. 2. **Measure the compression ratio on your data.** If LZ4 provides less than 1.5:1 ratio, compression may not be worth the CPU cost. diff --git a/guides/understanding_spatial_codecs.md b/guides/understanding_spatial_codecs.md index 69e813d..0dfd2c0 100644 --- a/guides/understanding_spatial_codecs.md +++ b/guides/understanding_spatial_codecs.md @@ -1,12 +1,15 @@ # Understanding Spatial Codecs -ExCodecs includes a spatial **category module** (`ExCodecs.Spatial`) for -continuous and geometric data: point clouds and Gaussian splats. These codecs -map between structured Elixir types and interchange formats. They do not render -or use NIFs — pure Elixir. +Spatial is a category in the ExCodecs framework for continuous and geometric +data: point clouds and Gaussian splats. These codecs map between structured +Elixir types and interchange formats. They do not render or use NIFs — pure +Elixir. -The top-level registry API (`ExCodecs.encode(codec, binary)`) is **not** used -for spatial data. Always call `ExCodecs.Spatial.*`. +ExCodecs uses specialized category APIs because data shapes differ. The +top-level registry API handles binary→binary codecs; spatial struct↔format work +uses `ExCodecs.Spatial.*`. Both follow the framework's tagged-result and +structured-error conventions, and both are registered in the shared codec +catalog. ## Domain Types @@ -37,12 +40,17 @@ PLY encode options (after Spatial `format: :ply` is selected): - `:source` — for streams: `:auto` (default), `:file`, or `:binary` Spatial stream helpers materialize the full payload today (lazy enumeration of -an in-memory list). Pass `source: :file` when the argument is a filesystem path. +an in-memory list). Prefer explicit `source: :file` or `source: :binary`. +With `:auto`, a binary is opened as a path only when it looks path-like (under +4 KiB, no `ply`/`EXCP`/`GSPL` magic, separator or known extension) **and** is a +regular file. Files without separators/extensions are not auto-detected. + +Wire layouts for EXCP/GSPL/PLY schema rules are frozen in +[Spatial wire formats](../docs/spatial_formats.md). ## API -Spatial is a **category module** (like `ExCodecs.Compression`). Prefer it over -the top-level registry API for all spatial work: +Use the spatial category API for all spatial work: ```elixir alias ExCodecs.Spatial.{Point, PointCloud} @@ -64,10 +72,12 @@ ExCodecs.Spatial.stream_decode(ply, format: :ply) ExCodecs.Spatial.available_formats() ExCodecs.Spatial.supports?(:ply) +ExCodecs.available_codecs(:spatial) +ExCodecs.codec_info(:ply) ``` -`ExCodecs.encode/3` and `ExCodecs.decode/3` remain **codec atom + binary** only -(registry compression codecs). Passing a `PointCloud` or `format: :ply` there +`ExCodecs.encode/3` and `ExCodecs.decode/3` remain **binary-interface codec atom ++ binary** only. Spatial atoms are discoverable there, but operation dispatch returns a clear error pointing at this module. ## Examples diff --git a/guides/understanding_zstd.md b/guides/understanding_zstd.md index da1c050..5138e7f 100644 --- a/guides/understanding_zstd.md +++ b/guides/understanding_zstd.md @@ -1,6 +1,6 @@ # Understanding Zstd -Zstandard (Zstd) is the default codec for most use cases in ExCodecs. This guide provides a deep dive into how Zstd works, its compression levels, dictionary compression, and how to get the most out of it. +Zstandard (Zstd) is the default codec for most use cases in ExCodecs. This guide provides a deep dive into how Zstd works, its compression levels, format capabilities, and the subset exposed by ExCodecs. ## Overview @@ -78,26 +78,31 @@ General recommendations: - **Levels 10-14**: Archival, batch processing, cold storage. - **Levels 15-22**: Extreme ratio scenarios. Only use if compression time is irrelevant. -## Dictionary Compression +## Dictionary Compression (not exposed) -Zstd supports **dictionary compression** for improving ratios on small data. Normally, compression algorithms need a large enough input to build an effective dictionary. With a pre-trained dictionary, even small inputs (a few hundred bytes) can achieve significant compression. +The Zstd format supports dictionary compression for small, structurally similar +payloads, but **ExCodecs does not currently expose dictionary training, +dictionary compression, or dictionary decompression options**. -### How It Works +At the format level, dictionary workflows normally: 1. **Train** a dictionary on a representative sample of your data. 2. **Compress** each small payload using the trained dictionary. 3. **Decompress** using the same dictionary. -The dictionary is typically 8-112 KB and is stored alongside or referenced by the compressed data. It captures the common patterns of your data domain, so small payloads benefit from the dictionary's knowledge. +The dictionary is typically stored alongside or referenced by compressed data. +Both encoder and decoder must use the same dictionary. -### When to Use Dictionaries +Potential future use cases include: - Small messages (under 100 KB) that share common structure. - JSON or protocol buffers with repeated schemas. - Log entries or metrics that follow a pattern. - When you control both the compression and decompression side. -ExCodecs currently provides block-level compression and decompression. Dictionary support requires managing the dictionary bytes externally and passing them through a custom Codec module that wraps `ExCodecs.Native` calls with dictionary parameters. +The current native API has no dictionary parameters, so a custom codec cannot +obtain dictionary support merely by forwarding options to `ExCodecs.Native`. +Use another Zstd implementation if dictionaries are required today. ## Streaming @@ -178,4 +183,5 @@ Zstd is strictly superior to GZIP/Deflate on both ratio and speed. It is the rec 5. **Watch memory at high levels.** Large payloads require room for input and output buffers (block API). -6. **Consider dictionary compression for small payloads.** If you are compressing many small messages with shared structure, a trained dictionary can double or triple compression ratios. \ No newline at end of file +6. **Do not pass dictionary options.** They are not implemented by ExCodecs. + Evaluate another Zstd implementation when dictionary compression is required. \ No newline at end of file diff --git a/lib/ex_codecs.ex b/lib/ex_codecs.ex index 52af55c..3c8d685 100644 --- a/lib/ex_codecs.ex +++ b/lib/ex_codecs.ex @@ -2,26 +2,25 @@ defmodule ExCodecs do @moduledoc """ Extensible BEAM-native **codec framework** for Elixir. - ## Public API (one shape) + ## One framework, specialized category APIs - Registry binary codecs always use: + Binary→binary registry codecs use: ExCodecs.encode(codec_atom, binary, opts \\\\ []) ExCodecs.decode(codec_atom, binary, opts \\\\ []) - That is the primary framework entry point — the same model as the original - library. Lookups go through `ExCodecs.CodecRegistry`. - - **Category modules** are namespaces and helpers, not a second encode/decode - protocol: + All implementations are registered in the shared `ExCodecs.CodecRegistry` + catalog. Category modules provide entry points suited to their data: * `ExCodecs.Compression` — `compress/3` / `decompress/3` aliases of the registry API, plus listing codecs in the compression category * `ExCodecs.Spatial` — domain types and formats for point clouds / - Gaussians (struct ↔ format). Spatial is not binary→binary, so it does - not use `encode(:ply, binary)`; call `ExCodecs.Spatial.encode/2` instead + Gaussians (struct↔format). Call `ExCodecs.Spatial.encode/2` and + `ExCodecs.Spatial.decode/2` - Registry encoding and decoding therefore keep the codec atom first: + The APIs belong to one framework and share tagged results and + `%ExCodecs.Error{}` conventions. They are not overloaded because their input + shapes differ. Registry encoding and decoding keep the codec atom first: {:ok, compressed} = ExCodecs.encode(:zstd, data) {:ok, decoded} = ExCodecs.decode(:zstd, compressed) @@ -30,7 +29,7 @@ defmodule ExCodecs do | Codec | Notes | |-------|--------| - | `:zstd` | Pure-Rust Zstd (`ruzstd`) | + | `:zstd` | Pure-Rust Zstd (`structured-zstd`) | | `:lz4` | Size-prepended `lz4_flex` blocks | | `:snappy` | Standalone Snappy codec | | `:bzip2` | Pure-Rust bzip2 | @@ -66,7 +65,7 @@ defmodule ExCodecs do {:ok, cloud} = ExCodecs.Spatial.decode(ply, format: :ply) ExCodecs.available_codecs() - #=> [:blosc2, :bzip2, :lz4, :snappy, :zstd] + #=> [:blosc2, :bzip2, :gsplat, :lz4, :ply, :snappy, :spatial_binary, :zstd] ## Error policy @@ -132,6 +131,10 @@ defmodule ExCodecs do def encode(codec, data, opts) when is_atom(codec) and is_binary(data) and is_list(opts) do case CodecRegistry.lookup(codec) do + {:ok, {_module, _category, %{interface: interface}}} + when interface != :binary -> + interface_error(codec, :encode) + {:ok, {module, _category, info}} -> case ensure_available(info, codec) do :ok -> module.encode(data, opts) @@ -213,6 +216,10 @@ defmodule ExCodecs do def decode(codec, data, opts) when is_atom(codec) and is_binary(data) and is_list(opts) do case CodecRegistry.lookup(codec) do + {:ok, {_module, _category, %{interface: interface}}} + when interface != :binary -> + interface_error(codec, :decode) + {:ok, {module, _category, info}} -> case ensure_available(info, codec) do :ok -> module.decode(data, opts) @@ -344,16 +351,14 @@ defmodule ExCodecs do @doc """ Lists **registered** codec atoms that are available at runtime. - Spatial formats are **not** included — use `ExCodecs.Spatial.available_formats/0`. - ## Arguments None. ## Returns - A sorted `[atom()]` containing registered entries whose implementation module - is non-`nil`, for example `[:blosc2, :bzip2, :lz4, :snappy, :zstd]`. + A sorted `[atom()]` containing every shared-catalog entry whose + implementation module is non-`nil`, including binary and spatial codecs. ## Raises @@ -370,10 +375,33 @@ defmodule ExCodecs do end @doc """ - Returns whether a **registered** codec is available. + Lists available codec names in one category. - Spatial format atoms (`:ply`, …) always return `false` here — use - `ExCodecs.Spatial.supports?/1`. + ## Arguments + + * `category` — category atom such as `:compression` or `:spatial` + + ## Returns + + A sorted list of available names in that category. + + ## Raises + + Raises `FunctionClauseError` for a non-atom category and may raise + `ArgumentError` if the shared catalog has not started. + + ## Examples + + iex> ExCodecs.available_codecs(:spatial) + [:gsplat, :ply, :spatial_binary] + """ + @spec available_codecs(atom()) :: [atom()] + def available_codecs(category) when is_atom(category) do + CodecRegistry.available_codecs(category) + end + + @doc """ + Returns whether a shared-catalog codec is available. ## Arguments @@ -411,8 +439,9 @@ defmodule ExCodecs do ## Returns - * `{:ok, ExCodecs.Codec.t()}` — name, category, module, capability flags, - and backend version; unavailable codecs are returned with `module: nil` + * `{:ok, ExCodecs.Codec.t()}` — name, category, interface, module, + capability flags, and backend version; unavailable codecs are returned + with `module: nil` * `{:error, :unsupported_codec}` — not registered (note: bare atom, not `%Error{}`) ## Raises @@ -442,4 +471,14 @@ defmodule ExCodecs do {:error, Error.new(:codec_unavailable, codec: codec)} end end + + defp interface_error(codec, operation) do + {:error, + Error.new(:invalid_options, + codec: codec, + message: + "#{inspect(codec)} uses the spatial category API; call " <> + "ExCodecs.Spatial.#{operation}/2 with format: #{inspect(codec)}" + )} + end end diff --git a/lib/ex_codecs/application.ex b/lib/ex_codecs/application.ex index 62388c2..4c4831b 100644 --- a/lib/ex_codecs/application.ex +++ b/lib/ex_codecs/application.ex @@ -2,8 +2,8 @@ defmodule ExCodecs.Application do @moduledoc """ OTP Application callback module for ExCodecs. - Starts the `ExCodecs.CodecRegistry` and registers all built-in codecs - during application startup. + Starts the shared `ExCodecs.CodecRegistry` catalog and registers all built-in + binary and spatial codecs during application startup. """ use Application @@ -13,7 +13,7 @@ defmodule ExCodecs.Application do Starts the ExCodecs supervision tree. This callback starts `ExCodecs.CodecRegistry`, registers every built-in - compression codec, and supervises the registry with a `:one_for_one` + codec entry, and supervises the registry with a `:one_for_one` strategy. It is invoked by OTP when the `:ex_codecs` application starts; application code should normally use `Application.ensure_all_started/1` instead of calling this function directly. @@ -86,16 +86,22 @@ defmodule ExCodecs.Application do @doc false def register_all_codecs do codecs = [ - {:zstd, ExCodecs.Compression.Zstd, :compression}, - {:lz4, ExCodecs.Compression.Lz4, :compression}, - {:snappy, ExCodecs.Compression.Snappy, :compression}, - {:bzip2, ExCodecs.Compression.Bzip2, :compression}, - {:blosc2, ExCodecs.Compression.Blosc2, :compression} + {:zstd, ExCodecs.Compression.Zstd, :compression, :binary, []}, + {:lz4, ExCodecs.Compression.Lz4, :compression, :binary, []}, + {:snappy, ExCodecs.Compression.Snappy, :compression, :binary, []}, + {:bzip2, ExCodecs.Compression.Bzip2, :compression, :binary, []}, + {:blosc2, ExCodecs.Compression.Blosc2, :compression, :binary, []}, + {:ply, ExCodecs.Spatial.Codec.PLY, :spatial, :spatial, + [native?: false, streaming?: false, configurable?: true, version: "PLY 1.0"]}, + {:spatial_binary, ExCodecs.Spatial.Codec.Binary, :spatial, :spatial, + [native?: false, streaming?: false, configurable?: false, version: "EXCP 1"]}, + {:gsplat, ExCodecs.Spatial.Codec.Gsplat, :spatial, :spatial, + [native?: false, streaming?: false, configurable?: false, version: "GSPL 1"]} ] nif_ok? = ExCodecs.Native.nif_loaded?() - for {name, module, category} <- codecs do + for {name, module, category, interface, metadata} <- codecs do native? = function_exported?(module, :__codec_info__, 0) and match?(%{native?: true}, module.__codec_info__()) @@ -105,9 +111,9 @@ defmodule ExCodecs.Application do function_exported?(module, :decode, 2) if loadable? and (not native? or nif_ok?) do - ExCodecs.CodecRegistry.register(name, module, category) + ExCodecs.CodecRegistry.register(name, module, category, interface, metadata) else - ExCodecs.CodecRegistry.register_unavailable(name, category) + ExCodecs.CodecRegistry.register_unavailable(name, category, interface) end end diff --git a/lib/ex_codecs/codec.ex b/lib/ex_codecs/codec.ex index 9b64ad4..1f9b42e 100644 --- a/lib/ex_codecs/codec.ex +++ b/lib/ex_codecs/codec.ex @@ -1,15 +1,18 @@ defmodule ExCodecs.Codec do @moduledoc """ - Behaviour and metadata struct for **registry** binary codecs. + Binary-codec behaviour and shared catalog metadata. - Every module registered with `ExCodecs.CodecRegistry` should implement - `encode/2` and `decode/2` on **binaries**. Spatial format codecs do **not** - use this behaviour (they live under `ExCodecs.Spatial`). + Binary-interface modules registered with `ExCodecs.CodecRegistry` implement + this module's `encode/2` and `decode/2` callbacks on **binaries**. Spatial + entries share the catalog metadata struct but use the specialized + `ExCodecs.Spatial` contract because they map domain structs↔formats. - The `%ExCodecs.Codec{}` struct describes a registry entry. Its fields are: + The `%ExCodecs.Codec{}` struct describes any shared-catalog entry. Its fields + are: * `name` (`atom()`) — registry key, such as `:zstd` - * `category` (`atom()`) — codec category, currently `:compression` + * `category` (`atom()`) — codec category, such as `:compression` or `:spatial` + * `interface` (`:binary | :spatial`) — public API shape used by the entry * `module` (`module() | nil`) — implementation module, or `nil` when the codec is known but unavailable * `native?` (`boolean()`) — whether the implementation uses a NIF @@ -46,7 +49,7 @@ defmodule ExCodecs.Codec do native?: true, streaming?: false, configurable?: true, - version: "ruzstd-0.8" + version: "structured-zstd-0.0.48" } end end @@ -191,14 +194,16 @@ defmodule ExCodecs.Codec do @callback decode(data :: binary(), opts :: keyword()) :: decode_result() @typedoc """ - Metadata for one binary codec registry entry. + Metadata for one shared codec-catalog entry. Every field is public: - * `name` — registry atom passed to `ExCodecs.encode/3` and - `ExCodecs.decode/3` + * `name` — catalog atom; binary entries can be passed to + `ExCodecs.encode/3` and `ExCodecs.decode/3` * `category` — grouping atom used by `ExCodecs.CodecRegistry.codecs_by_category/1` + * `interface` — `:binary` for the top-level registry API or `:spatial` for + `ExCodecs.Spatial` * `module` — callback implementation, or `nil` for an unavailable codec * `native?` — indicates NIF-backed operation * `streaming?` — indicates incremental processing support @@ -215,6 +220,7 @@ defmodule ExCodecs.Codec do @type t :: %__MODULE__{ name: atom(), category: atom(), + interface: :binary | :spatial, module: module() | nil, native?: boolean(), streaming?: boolean(), @@ -222,7 +228,14 @@ defmodule ExCodecs.Codec do version: String.t() | nil } - defstruct [:name, :category, :module, :native?, :streaming?, :configurable?, :version] + defstruct name: nil, + category: nil, + interface: :binary, + module: nil, + native?: nil, + streaming?: nil, + configurable?: nil, + version: nil @doc """ Returns whether `module` exports `encode/2` and `decode/2`. diff --git a/lib/ex_codecs/codec_registry.ex b/lib/ex_codecs/codec_registry.ex index 6145a4b..82de59b 100644 --- a/lib/ex_codecs/codec_registry.ex +++ b/lib/ex_codecs/codec_registry.ex @@ -1,14 +1,16 @@ defmodule ExCodecs.CodecRegistry do @moduledoc """ - Runtime registry of **binary** codecs (ETS-backed). + Shared runtime catalog of codec implementations (ETS-backed). - Populated at application start (and again if this process restarts). Spatial - formats are **not** registered here — use `ExCodecs.Spatial`. + Populated at application start (and again if this process restarts). Entries + carry a category and interface shape: binary codecs use the top-level + registry API, while spatial entries are dispatched through + `ExCodecs.Spatial`. ## Typical use iex> ExCodecs.available_codecs() - [:blosc2, :bzip2, :lz4, :snappy, :zstd] + [:blosc2, :bzip2, :gsplat, :lz4, :ply, :snappy, :spatial_binary, :zstd] iex> ExCodecs.supports?(:zstd) true @@ -71,7 +73,7 @@ defmodule ExCodecs.CodecRegistry do end @doc """ - Registers a module that validates as `ExCodecs.Codec`. + Registers a binary-interface module that exports `encode/2` and `decode/2`. ## Arguments @@ -103,7 +105,58 @@ defmodule ExCodecs.CodecRegistry do """ @spec register(atom(), module(), atom()) :: :ok | {:error, term()} def register(name, module, category) do - codec_info = build_codec_info(name, module, category) + register(name, module, category, :binary) + end + + @doc """ + Registers a module in the shared catalog with an explicit interface. + + `:binary` entries are dispatched by `ExCodecs.encode/3` / `decode/3`. + `:spatial` entries are discoverable from the same catalog but dispatched by + `ExCodecs.Spatial`. + + ## Arguments + + * `name` — catalog key + * `module` — module exporting `encode/2` and `decode/2` + * `category` — grouping atom such as `:compression` or `:spatial` + * `interface` — `:binary` or `:spatial` + + ## Returns + + `:ok` on registration or `{:error, {:invalid_codec_module, module}}`. + + ## Raises + + May raise `ArgumentError` if the registry table has not started, or propagate + an exception from a module's optional `__codec_info__/0`. + + ## Examples + + iex> :ok = ExCodecs.CodecRegistry.register( + ...> :documented_ply, + ...> ExCodecs.Spatial.Codec.PLY, + ...> :spatial, + ...> :spatial + ...> ) + iex> {:ok, info} = ExCodecs.CodecRegistry.codec_info(:documented_ply) + iex> {info.category, info.interface} + {:spatial, :spatial} + iex> ExCodecs.CodecRegistry.unregister(:documented_ply) + :ok + """ + @spec register(atom(), module(), atom(), :binary | :spatial) :: :ok | {:error, term()} + def register(name, module, category, interface) + when interface in [:binary, :spatial] do + register(name, module, category, interface, []) + end + + @doc false + @spec register(atom(), module(), atom(), :binary | :spatial, keyword()) :: + :ok | {:error, term()} + def register(name, module, category, interface, metadata) + when interface in [:binary, :spatial] and is_list(metadata) do + codec_info = build_codec_info(name, module, category, interface, metadata) case ExCodecs.Codec.validates?(module) do true -> @@ -142,9 +195,17 @@ defmodule ExCodecs.CodecRegistry do """ @spec register_unavailable(atom(), atom()) :: :ok def register_unavailable(name, category) do + register_unavailable(name, category, :binary) + end + + @doc false + @spec register_unavailable(atom(), atom(), :binary | :spatial) :: :ok + def register_unavailable(name, category, interface) + when interface in [:binary, :spatial] do codec_info = %ExCodecs.Codec{ name: name, category: category, + interface: interface, module: nil, native?: false, streaming?: false, @@ -251,6 +312,36 @@ defmodule ExCodecs.CodecRegistry do |> Enum.sort() end + @doc """ + Sorted available catalog names in one category. + + ## Arguments + + * `category` — category atom such as `:compression` or `:spatial` + + ## Returns + + Available names with non-`nil` modules, sorted by name. + + ## Raises + + May raise `ArgumentError` if the registry table has not started. + + ## Examples + + iex> ExCodecs.CodecRegistry.available_codecs(:spatial) + [:gsplat, :ply, :spatial_binary] + """ + @spec available_codecs(atom()) :: [atom()] + def available_codecs(category) when is_atom(category) do + :ets.tab2list(@table_name) + |> Enum.filter(fn {_name, {module, cat, _info}} -> + module != nil and cat == category + end) + |> Enum.map(fn {name, _} -> name end) + |> Enum.sort() + end + @doc """ Sorted list of all registered names (including unavailable). @@ -379,7 +470,7 @@ defmodule ExCodecs.CodecRegistry do |> Enum.sort_by(& &1.name) end - defp build_codec_info(name, module, category) do + defp build_codec_info(name, module, category, interface, metadata) do info = if function_exported?(module, :__codec_info__, 0) do module.__codec_info__() @@ -390,11 +481,12 @@ defmodule ExCodecs.CodecRegistry do %ExCodecs.Codec{ name: name, category: category, + interface: interface, module: module, - native?: info.native?, - streaming?: info.streaming?, - configurable?: info.configurable?, - version: info.version + native?: Keyword.get(metadata, :native?, info.native?), + streaming?: Keyword.get(metadata, :streaming?, info.streaming?), + configurable?: Keyword.get(metadata, :configurable?, info.configurable?), + version: Keyword.get(metadata, :version, info.version) } end end diff --git a/lib/ex_codecs/compression/blosc2.ex b/lib/ex_codecs/compression/blosc2.ex index 9f129b5..1bf77c4 100644 --- a/lib/ex_codecs/compression/blosc2.ex +++ b/lib/ex_codecs/compression/blosc2.ex @@ -28,6 +28,12 @@ defmodule ExCodecs.Compression.Blosc2 do * `:clevel` — `0..9` (default `5`) * `:shuffle` — `:none` | `:byte` (default) | `:bit` * `:typesize` — `1..255` (default `8`) + * `:max_output_size` — Maximum allowed decompressed size in bytes + (default: 256 MiB; also hard-capped at 1 GiB per chunk) + + ## Security + + Do not decompress untrusted inputs without a tight `:max_output_size`. ### Snappy @@ -231,8 +237,10 @@ defmodule ExCodecs.Compression.Blosc2 do :invalid_data """ @impl true - def decode(data, _opts) when is_binary(data) do - ExCodecs.NIF.safe_call(:blosc2, fn -> ExCodecs.Native.blosc2_decompress(data) end) + def decode(data, opts) when is_binary(data) and is_list(opts) do + with {:ok, max} <- ExCodecs.NIF.max_output_size(opts) do + ExCodecs.NIF.safe_call(:blosc2, fn -> ExCodecs.Native.blosc2_decompress(data, max) end) + end end def decode(_data, _opts) do diff --git a/lib/ex_codecs/compression/bzip2.ex b/lib/ex_codecs/compression/bzip2.ex index ffb387f..9ff37b9 100644 --- a/lib/ex_codecs/compression/bzip2.ex +++ b/lib/ex_codecs/compression/bzip2.ex @@ -5,6 +5,12 @@ defmodule ExCodecs.Compression.Bzip2 do ## Options * `:block_size` — 1..9 (default 9) + * `:max_output_size` — Maximum allowed decompressed size in bytes + (default: 256 MiB) + + ## Security + + Do not decompress untrusted inputs without a tight `:max_output_size`. ## Examples @@ -162,8 +168,10 @@ defmodule ExCodecs.Compression.Bzip2 do :decompression_failed """ @impl true - def decode(data, _opts) when is_binary(data) do - ExCodecs.NIF.safe_call(:bzip2, fn -> ExCodecs.Native.bzip2_decompress(data) end) + def decode(data, opts) when is_binary(data) and is_list(opts) do + with {:ok, max} <- ExCodecs.NIF.max_output_size(opts) do + ExCodecs.NIF.safe_call(:bzip2, fn -> ExCodecs.Native.bzip2_decompress(data, max) end) + end end def decode(_data, _opts), do: {:error, ExCodecs.Error.new(:invalid_data, codec: :bzip2)} diff --git a/lib/ex_codecs/compression/lz4.ex b/lib/ex_codecs/compression/lz4.ex index c8e8653..a3fceac 100644 --- a/lib/ex_codecs/compression/lz4.ex +++ b/lib/ex_codecs/compression/lz4.ex @@ -7,7 +7,12 @@ defmodule ExCodecs.Compression.Lz4 do ## Options - None. + * `:max_output_size` — Maximum allowed decompressed size in bytes + (default: 256 MiB). + + ## Security + + Do not decompress untrusted inputs without a tight `:max_output_size`. ## Examples @@ -116,8 +121,8 @@ defmodule ExCodecs.Compression.Lz4 do * `data` (`binary()`) — a size-prepended `lz4_flex` block, normally produced by `encode/2` - * `opts` (`term()`) — ignored by this direct function; callers using the - codec behaviour or registry API should pass the keyword list `[]` + * `opts` (`keyword()`) — optional `:max_output_size` (positive integer + bytes, default 256 MiB) ## Returns @@ -125,6 +130,10 @@ defmodule ExCodecs.Compression.Lz4 do * `{:error, %ExCodecs.Error{reason: :invalid_data}}` when `data` is not a binary, the NIF raises an argument error, or it returns an unexpected value + * `{:error, %ExCodecs.Error{reason: :invalid_options}}` when + `:max_output_size` is not a positive integer + * `{:error, %ExCodecs.Error{reason: :output_limit_exceeded}}` when the + claimed or actual size exceeds `:max_output_size` * `{:error, %ExCodecs.Error{reason: :decompression_failed}}` when the size prefix or compressed block is corrupt, truncated, or incompatible * `{:error, %ExCodecs.Error{reason: :nif_not_loaded}}` when the native @@ -148,8 +157,10 @@ defmodule ExCodecs.Compression.Lz4 do :decompression_failed """ @impl true - def decode(data, _opts) when is_binary(data) do - ExCodecs.NIF.safe_call(:lz4, fn -> ExCodecs.Native.lz4_decompress(data) end) + def decode(data, opts) when is_binary(data) and is_list(opts) do + with {:ok, max} <- ExCodecs.NIF.max_output_size(opts) do + ExCodecs.NIF.safe_call(:lz4, fn -> ExCodecs.Native.lz4_decompress(data, max) end) + end end def decode(_data, _opts), do: {:error, ExCodecs.Error.new(:invalid_data, codec: :lz4)} diff --git a/lib/ex_codecs/compression/snappy.ex b/lib/ex_codecs/compression/snappy.ex index b1d2184..d745c46 100644 --- a/lib/ex_codecs/compression/snappy.ex +++ b/lib/ex_codecs/compression/snappy.ex @@ -8,7 +8,12 @@ defmodule ExCodecs.Compression.Snappy do ## Options - None. + * `:max_output_size` — Maximum allowed decompressed size in bytes + (default: 256 MiB). + + ## Security + + Do not decompress untrusted inputs without a tight `:max_output_size`. ## Examples @@ -150,8 +155,10 @@ defmodule ExCodecs.Compression.Snappy do :decompression_failed """ @impl true - def decode(data, _opts) when is_binary(data) do - ExCodecs.NIF.safe_call(:snappy, fn -> ExCodecs.Native.snappy_decompress(data) end) + def decode(data, opts) when is_binary(data) and is_list(opts) do + with {:ok, max} <- ExCodecs.NIF.max_output_size(opts) do + ExCodecs.NIF.safe_call(:snappy, fn -> ExCodecs.Native.snappy_decompress(data, max) end) + end end def decode(_data, _opts), do: {:error, ExCodecs.Error.new(:invalid_data, codec: :snappy)} diff --git a/lib/ex_codecs/compression/zstd.ex b/lib/ex_codecs/compression/zstd.ex index 0221728..8793941 100644 --- a/lib/ex_codecs/compression/zstd.ex +++ b/lib/ex_codecs/compression/zstd.ex @@ -2,15 +2,20 @@ defmodule ExCodecs.Compression.Zstd do @moduledoc """ Zstandard (Zstd) compression codec. - Zstd is a fast compression algorithm providing high compression ratios. - It was developed by Yann Collet at Facebook and offers configurable - compression levels from 1 (fastest) to 22 (smallest). + Pure-Rust backend via `structured-zstd` (no C libzstd). Compression levels + `1`–`22` are passed through to the encoder. Ratios and exact bytes may differ + from reference C Zstd at the same numeric level. ## Options - * `:level` — Compression level, 1-22 (default: 3). The pure-Rust backend - (`ruzstd`) currently maps all levels to a fast profile; higher values are - accepted for API stability and may gain finer control in future releases. + * `:level` — Compression level, 1-22 (default: 3). + * `:max_output_size` — Maximum allowed decompressed size in bytes + (default: 256 MiB). Rejects bombs that would expand beyond the limit. + + ## Security + + Do not decompress **untrusted** inputs without a tight `:max_output_size`. + A small malicious frame can expand to a large allocation. ## Performance Characteristics @@ -50,7 +55,7 @@ defmodule ExCodecs.Compression.Zstd do * `native?: true` because compression runs in a NIF * `streaming?: false` because only complete frames are supported * `configurable?: true` because `encode/2` accepts `:level` - * `version: "ruzstd-0.8"` for the backend implementation + * `version: "structured-zstd-0.0.48"` for the backend implementation ## Raises / Exceptions @@ -66,7 +71,7 @@ defmodule ExCodecs.Compression.Zstd do native?: true, streaming?: false, configurable?: true, - version: "ruzstd-0.8" + version: "structured-zstd-0.0.48" } """ def __codec_info__ do @@ -81,7 +86,7 @@ defmodule ExCodecs.Compression.Zstd do } end - defp zstd_version, do: "ruzstd-0.8" + defp zstd_version, do: "structured-zstd-0.0.48" @doc """ Compresses a binary with pure-Rust Zstd. @@ -140,13 +145,18 @@ defmodule ExCodecs.Compression.Zstd do ## Arguments * `data` (`binary()`) — a complete Zstandard frame - * `opts` (`keyword()`) — currently ignored, but must be a list; pass `[]` + * `opts` (`keyword()`) — optional `:max_output_size` (positive integer + bytes, default 256 MiB) ## Returns * `{:ok, decompressed :: binary()}` on success * `{:error, %ExCodecs.Error{reason: :invalid_data}}` when `data` is not a binary, `opts` is not a list, or the NIF raises an argument error + * `{:error, %ExCodecs.Error{reason: :invalid_options}}` when + `:max_output_size` is not a positive integer + * `{:error, %ExCodecs.Error{reason: :output_limit_exceeded}}` when the + decompressed size would exceed `:max_output_size` * `{:error, %ExCodecs.Error{reason: :decompression_failed}}` when `data` is corrupt, truncated, or not a Zstandard frame * `{:error, %ExCodecs.Error{reason: :nif_not_loaded}}` when the native @@ -171,7 +181,9 @@ defmodule ExCodecs.Compression.Zstd do """ @impl true def decode(data, opts) when is_binary(data) and is_list(opts) do - ExCodecs.NIF.safe_call(:zstd, fn -> ExCodecs.Native.zstd_decompress(data) end) + with {:ok, max} <- ExCodecs.NIF.max_output_size(opts) do + ExCodecs.NIF.safe_call(:zstd, fn -> ExCodecs.Native.zstd_decompress(data, max) end) + end end def decode(_data, _opts), do: {:error, ExCodecs.Error.new(:invalid_data, codec: :zstd)} diff --git a/lib/ex_codecs/error.ex b/lib/ex_codecs/error.ex index fa60fa9..8be5cd2 100644 --- a/lib/ex_codecs/error.ex +++ b/lib/ex_codecs/error.ex @@ -31,6 +31,7 @@ defmodule ExCodecs.Error do | `:nif_not_loaded` | NIF library missing | | `:io_error` | File read/write failure | | `:truncated_input` | Incomplete binary | + | `:output_limit_exceeded` | Decompress would exceed `max_output_size` | ## As exception @@ -50,6 +51,7 @@ defmodule ExCodecs.Error do * `:nif_not_loaded` — native library could not be loaded * `:io_error` — file operation failed * `:truncated_input` — encoded input ended before a complete value + * `:output_limit_exceeded` — decompress output would exceed `max_output_size` ## Example @@ -67,6 +69,7 @@ defmodule ExCodecs.Error do | :nif_not_loaded | :io_error | :truncated_input + | :output_limit_exceeded @typedoc """ Structured ExCodecs error and exception. @@ -173,6 +176,10 @@ defmodule ExCodecs.Error do defp default_message(:nif_not_loaded), do: "The native NIF library is not loaded" defp default_message(:io_error), do: "An I/O error occurred" defp default_message(:truncated_input), do: "The input was truncated or incomplete" + + defp default_message(:output_limit_exceeded), + do: "Decompressed output exceeded the configured max_output_size" + defp default_message(reason), do: "Error: #{reason}" @impl true diff --git a/lib/ex_codecs/native.ex b/lib/ex_codecs/native.ex index f8da65f..1df00c5 100644 --- a/lib/ex_codecs/native.ex +++ b/lib/ex_codecs/native.ex @@ -38,29 +38,29 @@ defmodule ExCodecs.Native do @doc false def zstd_compress(_data, _level), do: :erlang.nif_error(:nif_not_loaded) @doc false - def zstd_decompress(_data), do: :erlang.nif_error(:nif_not_loaded) + def zstd_decompress(_data, _max_output_size), do: :erlang.nif_error(:nif_not_loaded) @doc false def lz4_compress(_data), do: :erlang.nif_error(:nif_not_loaded) @doc false - def lz4_decompress(_data), do: :erlang.nif_error(:nif_not_loaded) + def lz4_decompress(_data, _max_output_size), do: :erlang.nif_error(:nif_not_loaded) @doc false def snappy_compress(_data), do: :erlang.nif_error(:nif_not_loaded) @doc false - def snappy_decompress(_data), do: :erlang.nif_error(:nif_not_loaded) + def snappy_decompress(_data, _max_output_size), do: :erlang.nif_error(:nif_not_loaded) @doc false def bzip2_compress(_data, _block_size), do: :erlang.nif_error(:nif_not_loaded) @doc false - def bzip2_decompress(_data), do: :erlang.nif_error(:nif_not_loaded) + def bzip2_decompress(_data, _max_output_size), do: :erlang.nif_error(:nif_not_loaded) @doc false def blosc2_compress(_data, _cname, _clevel, _shuffle, _typesize), do: :erlang.nif_error(:nif_not_loaded) @doc false - def blosc2_decompress(_data), do: :erlang.nif_error(:nif_not_loaded) + def blosc2_decompress(_data, _max_output_size), do: :erlang.nif_error(:nif_not_loaded) @doc false def codec_versions, do: :erlang.nif_error(:nif_not_loaded) diff --git a/lib/ex_codecs/nif.ex b/lib/ex_codecs/nif.ex index 22ce255..ef60dc2 100644 --- a/lib/ex_codecs/nif.ex +++ b/lib/ex_codecs/nif.ex @@ -1,6 +1,26 @@ defmodule ExCodecs.NIF do @moduledoc false + # Default decompress ceiling: 256 MiB. Override with `max_output_size:`. + @default_max_output_size 268_435_456 + + @doc false + def default_max_output_size, do: @default_max_output_size + + @doc false + def max_output_size(opts) when is_list(opts) do + case Keyword.get(opts, :max_output_size, @default_max_output_size) do + n when is_integer(n) and n > 0 -> + {:ok, n} + + _ -> + {:error, + ExCodecs.Error.new(:invalid_options, + message: "max_output_size must be a positive integer (bytes)" + )} + end + end + @doc """ Wraps raw NIF error tuples into ExCodecs.Error structs. @@ -17,6 +37,17 @@ defmodule ExCodecs.NIF do def wrap(codec, {:error, :decompression_failed}), do: {:error, ExCodecs.Error.new(:decompression_failed, codec: codec)} + def wrap(codec, {:error, :output_limit_exceeded}), + do: + {:error, + ExCodecs.Error.new(:output_limit_exceeded, + codec: codec, + message: + "Decompressed output exceeded max_output_size " <> + "(default #{@default_max_output_size} bytes). " <> + "Pass a larger max_output_size: for trusted inputs." + )} + def wrap(codec, {:error, :invalid_data}), do: {:error, ExCodecs.Error.new(:invalid_data, codec: codec)} diff --git a/lib/ex_codecs/spatial.ex b/lib/ex_codecs/spatial.ex index 6c5b3db..b00a12f 100644 --- a/lib/ex_codecs/spatial.ex +++ b/lib/ex_codecs/spatial.ex @@ -1,10 +1,11 @@ defmodule ExCodecs.Spatial do @moduledoc """ - Spatial category module — point clouds and Gaussian splats. + Spatial category API for point clouds and Gaussian splats. - Namespace for domain types and formats. The framework’s primary - `ExCodecs.encode/3` / `decode/3` stay **codec atom + binary** only; this - module is not a second competing public protocol. + ExCodecs is one codec framework with entry points specialized by data shape. + Binary→binary registry codecs use `ExCodecs.encode/3` / `decode/3`; spatial + codecs map the domain structs below to and from interchange formats through + this module. ## Domain types @@ -26,7 +27,9 @@ defmodule ExCodecs.Spatial do | `:spatial_binary` | `ExCodecs.Spatial.Codec.Binary` | PointCloud (`EXCP`) | | `:gsplat` | `ExCodecs.Spatial.Codec.Gsplat` | GaussianCloud (`GSPL`) | - Formats are **not** in `ExCodecs.available_codecs/0`. + Spatial formats are registered in the shared codec catalog. Discover all + entries with `ExCodecs.available_codecs/0`, or only this category with + `available_formats/0`. ## Quick start @@ -44,13 +47,13 @@ defmodule ExCodecs.Spatial do ## Streaming note `stream_decode` / `stream_encode` currently materialize full payloads, then - enumerate. Prefer `source: :file` when the argument is a path. + enumerate. Prefer `source: :file` when the argument is a path, or + `source: :binary` for payloads. See `docs/spatial_formats.md` for `:auto` + path heuristics and wire-format layouts. """ - alias ExCodecs.Error + alias ExCodecs.{CodecRegistry, Error} alias ExCodecs.Spatial.{GaussianCloud, PointCloud} - alias ExCodecs.Spatial.Codec.{Binary, Gsplat, PLY} - @formats [:ply, :spatial_binary, :gsplat] @doc """ @@ -76,7 +79,11 @@ defmodule ExCodecs.Spatial do [:ply, :spatial_binary, :gsplat] """ @spec available_formats() :: [atom()] - def available_formats, do: @formats + def available_formats do + available = CodecRegistry.available_codecs(:spatial) + preferred = Enum.filter(@formats, &(&1 in available)) + preferred ++ Enum.reject(available, &(&1 in @formats)) + end @doc """ Tests whether an atom names a supported spatial format. @@ -103,7 +110,12 @@ defmodule ExCodecs.Spatial do false """ @spec supports?(atom()) :: boolean() - def supports?(format) when is_atom(format), do: format in @formats + def supports?(format) when is_atom(format) do + case CodecRegistry.codec_info(format) do + {:ok, %{category: :spatial, interface: :spatial, module: module}} -> module != nil + _ -> false + end + end @doc """ Encodes a point cloud or Gaussian cloud in a selected spatial format. @@ -156,44 +168,32 @@ defmodule ExCodecs.Spatial do def encode(%PointCloud{} = data, opts) do {format, codec_opts} = Keyword.pop(opts, :format, :ply) - case format do - :ply -> - PLY.encode(data, codec_opts) - - :spatial_binary -> - Binary.encode(data, codec_opts) - - :gsplat -> - {:error, - Error.new(:invalid_data, - codec: :gsplat, - message: "GSPLAT format requires a GaussianCloud" - )} - - other -> - {:error, Error.new(:unsupported_codec, codec: other)} + if format == :gsplat do + {:error, + Error.new(:invalid_data, + codec: :gsplat, + message: "GSPLAT format requires a GaussianCloud" + )} + else + with {:ok, module} <- spatial_codec(format) do + module.encode(data, codec_opts) + end end end def encode(%GaussianCloud{} = data, opts) do {format, codec_opts} = Keyword.pop(opts, :format, :ply) - case format do - :ply -> - PLY.encode(data, codec_opts) - - :gsplat -> - Gsplat.encode(data, codec_opts) - - :spatial_binary -> - {:error, - Error.new(:invalid_data, - codec: :spatial_binary, - message: "spatial_binary format requires a PointCloud" - )} - - other -> - {:error, Error.new(:unsupported_codec, codec: other)} + if format == :spatial_binary do + {:error, + Error.new(:invalid_data, + codec: :spatial_binary, + message: "spatial_binary format requires a PointCloud" + )} + else + with {:ok, module} <- spatial_codec(format) do + module.encode(data, codec_opts) + end end end @@ -249,11 +249,8 @@ defmodule ExCodecs.Spatial do def decode(data, opts) when is_binary(data) do {format, codec_opts} = Keyword.pop(opts, :format, :ply) - case format do - :ply -> PLY.decode(data, codec_opts) - :spatial_binary -> Binary.decode(data, codec_opts) - :gsplat -> Gsplat.decode(data, codec_opts) - other -> {:error, Error.new(:unsupported_codec, codec: other)} + with {:ok, module} <- spatial_codec(format) do + module.decode(data, codec_opts) end end @@ -261,6 +258,19 @@ defmodule ExCodecs.Spatial do {:error, Error.new(:invalid_data, message: "Spatial decode expects a binary")} end + defp spatial_codec(format) do + case CodecRegistry.lookup(format) do + {:ok, {module, :spatial, %{interface: :spatial}}} when module != nil -> + {:ok, module} + + {:ok, {nil, :spatial, %{interface: :spatial}}} -> + {:error, Error.new(:codec_unavailable, codec: format)} + + _ -> + {:error, Error.new(:unsupported_codec, codec: format)} + end + end + @doc """ Returns an enumerable over points or Gaussians decoded from a path or binary. diff --git a/lib/ex_codecs/spatial/codec/ply.ex b/lib/ex_codecs/spatial/codec/ply.ex index d72c92f..18c07ab 100644 --- a/lib/ex_codecs/spatial/codec/ply.ex +++ b/lib/ex_codecs/spatial/codec/ply.ex @@ -184,29 +184,7 @@ defmodule ExCodecs.Spatial.Codec.PLY do with {:ok, header, body} <- split_header(data), {:ok, parsed} <- parse_header(header) do - case resolve_as(as, parsed.properties) do - :point_cloud -> - with {:ok, points} <- decode_vertices(body, parsed) do - meta = - Metadata.new( - comments: parsed.comments, - entries: %{"ply_format" => to_string(parsed.format)} - ) - - {:ok, PointCloud.new(points, metadata: meta)} - end - - :gaussian_cloud -> - with {:ok, gaussians} <- decode_gaussians(body, parsed) do - meta = - Metadata.new( - comments: parsed.comments, - entries: %{"ply_format" => to_string(parsed.format)} - ) - - {:ok, GaussianCloud.new(gaussians, metadata: meta)} - end - end + decode_parsed_body(resolve_as(as, parsed.properties), body, parsed) end end @@ -255,13 +233,7 @@ defmodule ExCodecs.Spatial.Codec.PLY do def stream_decode(data, opts) when is_binary(data) do case resolve_ply_source(data, opts) do {:ok, :binary, bin} -> - case decode_to_list(bin, opts) do - {:ok, items} -> - Stream.map(items, & &1) - - {:error, error} -> - Stream.resource(fn -> {:error, error} end, &error_stream/1, fn _ -> :ok end) - end + stream_from_decoded_binary(bin, opts) {:ok, :file, path} -> Stream.resource( @@ -272,6 +244,16 @@ defmodule ExCodecs.Spatial.Codec.PLY do end end + defp stream_from_decoded_binary(bin, opts) do + case decode_to_list(bin, opts) do + {:ok, items} -> + Stream.map(items, & &1) + + {:error, error} -> + Stream.resource(fn -> {:error, error} end, &error_stream/1, fn _ -> :ok end) + end + end + defp resolve_ply_source(bin, opts) do case Keyword.get(opts, :source, :auto) do :binary -> @@ -309,8 +291,6 @@ defmodule ExCodecs.Spatial.Codec.PLY do String.starts_with?(data, "ply") end - defp ply_binary?(_), do: false - defp split_header(data) do case :binary.match(data, "end_header") do {pos, len} -> @@ -385,21 +365,28 @@ defmodule ExCodecs.Spatial.Codec.PLY do {:error, Error.new(:invalid_data, codec: :ply, message: "No vertex element in PLY")} idx -> - line = Enum.at(lines, idx) - - with {:ok, count} <- parse_vertex_count(line) do - props = - lines - |> Enum.drop(idx + 1) - |> Enum.take_while(&String.starts_with?(&1, "property ")) - |> Enum.map(&parse_property/1) - - if Enum.any?(props, &match?({:error, _}, &1)) do - {:error, Error.new(:invalid_data, codec: :ply, message: "Invalid PLY property")} - else - {:ok, count, props} - end - end + parse_vertex_element(lines, idx) + end + end + + defp parse_vertex_element(lines, idx) do + with {:ok, count} <- parse_vertex_count(Enum.at(lines, idx)), + {:ok, props} <- parse_vertex_properties(lines, idx) do + {:ok, count, props} + end + end + + defp parse_vertex_properties(lines, idx) do + props = + lines + |> Enum.drop(idx + 1) + |> Enum.take_while(&String.starts_with?(&1, "property ")) + |> Enum.map(&parse_property/1) + + if Enum.any?(props, &match?({:error, _}, &1)) do + {:error, Error.new(:invalid_data, codec: :ply, message: "Invalid PLY property")} + else + {:ok, props} end end @@ -531,29 +518,26 @@ defmodule ExCodecs.Spatial.Codec.PLY do %{type: :float, name: "rot_3"} ] - sh_props = - if has_sh? do - max_rest = - gaussians - |> Enum.map(fn g -> - case g.sh do - nil -> 0 - [_dc | rest] -> length(List.flatten(rest)) - _ -> 0 - end - end) - |> Enum.max(fn -> 0 end) - - for i <- 0..(max_rest - 1)//1, max_rest > 0 do - %{type: :float, name: "f_rest_#{i}"} - end - else - [] - end + base ++ sh_property_defs(gaussians, has_sh?) + end + + defp sh_property_defs(_gaussians, false), do: [] + + defp sh_property_defs(gaussians, true) do + max_rest = + gaussians + |> Enum.map(&sh_rest_coeff_count/1) + |> Enum.max() - base ++ sh_props + for i <- 0..(max_rest - 1)//1, max_rest > 0 do + %{type: :float, name: "f_rest_#{i}"} + end end + defp sh_rest_coeff_count(%{sh: nil}), do: 0 + defp sh_rest_coeff_count(%{sh: [_dc | rest]}), do: length(List.flatten(rest)) + defp sh_rest_coeff_count(_), do: 0 + defp build_header(format, count, props, comments) do format_line = case format do @@ -579,14 +563,10 @@ defmodule ExCodecs.Spatial.Codec.PLY do ) end - defp type_name(:char), do: "char" + # Encode only ever emits float and uchar properties (attributes are promoted + # to float32; see docs/spatial_formats.md), so no other types are needed here. defp type_name(:uchar), do: "uchar" - defp type_name(:short), do: "short" - defp type_name(:ushort), do: "ushort" - defp type_name(:int), do: "int" - defp type_name(:uint), do: "uint" defp type_name(:float), do: "float" - defp type_name(:double), do: "double" defp encode_points(points, props, :ascii) do points @@ -632,17 +612,10 @@ defmodule ExCodecs.Spatial.Codec.PLY do cond do Map.has_key?(known, name) -> Map.fetch!(known, name) Map.has_key?(attributes, name) -> Map.fetch!(attributes, name) - true -> attribute_atom_value(attributes, name) + true -> 0.0 end end - defp attribute_atom_value(attributes, name) do - atom = String.to_existing_atom(name) - Map.get(attributes, atom, 0.0) - rescue - ArgumentError -> 0.0 - end - defp color_channel(color, idx, default \\ 0) defp color_channel(nil, _idx, default), do: default @@ -704,7 +677,6 @@ defmodule ExCodecs.Spatial.Codec.PLY do end defp rest_coeff("f_rest_" <> idx, rest), do: Enum.at(rest, String.to_integer(idx), 0.0) - defp rest_coeff(_, _), do: 0.0 defp sh_rest_flat(nil), do: [] defp sh_rest_flat([_dc | rest]), do: List.flatten(rest) @@ -713,20 +685,11 @@ defmodule ExCodecs.Spatial.Codec.PLY do defp ascii_value(v) when is_integer(v), do: Integer.to_string(v) defp ascii_value(v) when is_float(v), do: :erlang.float_to_binary(v, [:short]) + # Like type_name/1, encode only packs float and uchar values; decode's + # unpack/3 still handles the full range of PLY scalar property types. defp pack(:uchar, v, _), do: <> - defp pack(:char, v, _), do: <> - defp pack(:ushort, v, :binary_le), do: <> - defp pack(:ushort, v, :binary_be), do: <> - defp pack(:short, v, :binary_le), do: <> - defp pack(:short, v, :binary_be), do: <> - defp pack(:uint, v, :binary_le), do: <> - defp pack(:uint, v, :binary_be), do: <> - defp pack(:int, v, :binary_le), do: <> - defp pack(:int, v, :binary_be), do: <> defp pack(:float, v, :binary_le), do: <> defp pack(:float, v, :binary_be), do: <> - defp pack(:double, v, :binary_le), do: <> - defp pack(:double, v, :binary_be), do: <> # --- Decode --------------------------------------------------------------- @@ -744,6 +707,25 @@ defmodule ExCodecs.Spatial.Codec.PLY do end end + defp decode_parsed_body(:point_cloud, body, parsed) do + with {:ok, points} <- decode_vertices(body, parsed) do + {:ok, PointCloud.new(points, metadata: ply_metadata(parsed))} + end + end + + defp decode_parsed_body(:gaussian_cloud, body, parsed) do + with {:ok, gaussians} <- decode_gaussians(body, parsed) do + {:ok, GaussianCloud.new(gaussians, metadata: ply_metadata(parsed))} + end + end + + defp ply_metadata(parsed) do + Metadata.new( + comments: parsed.comments, + entries: %{"ply_format" => to_string(parsed.format)} + ) + end + defp decode_vertices(body, %{format: :ascii, count: count, properties: props}) do lines = body @@ -793,7 +775,8 @@ defmodule ExCodecs.Spatial.Codec.PLY do with {:ok, points} <- decode_vertices(body, parsed) do gaussians = Enum.map(points, fn %Point{} = p -> - attrs = stringify_attrs(p.attributes) + # Point.new/4 normalizes attribute keys to strings. + attrs = p.attributes Gaussian.new({p.x, p.y, p.z}, color: { @@ -822,13 +805,6 @@ defmodule ExCodecs.Spatial.Codec.PLY do end end - defp stringify_attrs(attrs) do - Map.new(attrs, fn - {k, v} when is_atom(k) -> {Atom.to_string(k), v} - {k, v} when is_binary(k) -> {k, v} - end) - end - defp extract_sh(attrs) do rest_keys = attrs diff --git a/lib/ex_codecs/spatial/point.ex b/lib/ex_codecs/spatial/point.ex index b48e5f6..1cba240 100644 --- a/lib/ex_codecs/spatial/point.ex +++ b/lib/ex_codecs/spatial/point.ex @@ -12,8 +12,9 @@ defmodule ExCodecs.Spatial.Point do * `:normal` — `normal() | nil`; defaults to `nil`. Components follow the same axis convention as the coordinates and are normally unit length, though this module does not normalize them. - * `:attributes` — `attributes()`; defaults to `%{}`. Keys are atoms or - strings and values are numbers or binaries. + * `:attributes` — `attributes()`; defaults to `%{}`. Keys are **strings** + (atoms passed to `new/4` are converted via `to_string/1`). Values are + numbers or binaries. ## Example @@ -47,11 +48,11 @@ defmodule ExCodecs.Spatial.Point do """ @type normal :: {float(), float(), float()} @typedoc """ - User attributes keyed by atoms or strings, with numeric or binary values. - For example, `%{"intensity" => 0.82, :classification => 2}` stores two - application-defined point attributes. + User attributes keyed by strings, with numeric or binary values. + For example, `%{"intensity" => 0.82, "classification" => 2}`. + Atom keys passed to `new/4` are normalized to strings. """ - @type attributes :: %{optional(atom() | String.t()) => number() | binary()} + @type attributes :: %{optional(String.t()) => number() | binary()} @typedoc """ A spatial point. See the module documentation for every field, its default, @@ -83,7 +84,8 @@ defmodule ExCodecs.Spatial.Point do * `opts`: * `:color` — `rgb` or `rgba` tuple, or `nil` * `:normal` — `{nx, ny, nz}` or `nil` - * `:attributes` — map (default `%{}`) + * `:attributes` — map of string keys (default `%{}`); atom keys are + stringified ## Returns @@ -112,10 +114,17 @@ defmodule ExCodecs.Spatial.Point do z: z * 1.0, color: Keyword.get(opts, :color), normal: Keyword.get(opts, :normal), - attributes: Keyword.get(opts, :attributes, %{}) + attributes: normalize_attributes(Keyword.get(opts, :attributes, %{})) } end + defp normalize_attributes(attrs) when is_map(attrs) do + Map.new(attrs, fn + {k, v} when is_binary(k) -> {k, v} + {k, v} -> {to_string(k), v} + end) + end + @doc """ Returns `{x, y, z}`. diff --git a/lib/ex_codecs/spatial/stream.ex b/lib/ex_codecs/spatial/stream.ex index f516b65..af8d054 100644 --- a/lib/ex_codecs/spatial/stream.ex +++ b/lib/ex_codecs/spatial/stream.ex @@ -6,7 +6,13 @@ defmodule ExCodecs.Spatial.Stream do (or full enumerable) then yield items. True incremental I/O for multi-GB files is not implemented yet. - Prefer `source: :file` when the argument is a filesystem path. + Prefer `source: :file` when the argument is a filesystem path, or + `source: :binary` when it is an encoded payload. With `:auto` (default), a + binary is treated as a path only when it looks path-like (under 4 KiB, no + `ply`/`EXCP`/`GSPL` magic prefix, and contains `/` or `\\` or ends with + `.ply`/`.excp`/`.gspl`/`.bin`) **and** `File.regular?/1` is true. A real + file without separators/extensions is not auto-opened; a short slash-containing + binary that happens to be a regular path may be misread as a file. """ alias ExCodecs.Error diff --git a/livebooks/01_introduction.livemd b/livebooks/01_introduction.livemd index 7b9bb87..9172bf6 100644 --- a/livebooks/01_introduction.livemd +++ b/livebooks/01_introduction.livemd @@ -7,7 +7,7 @@ ex_codecs_dep = if File.exists?(local_path) do [{:ex_codecs, path: Path.join(__DIR__, "..")}, {:rustler, "~> 0.36"}] else - [{:ex_codecs, "~> 0.1"}] + [{:ex_codecs, "~> 0.2.0"}] end config = @@ -27,13 +27,20 @@ A **codec** (coder-decoder) is an abstraction for transforming data between two * **Encode** — transform data into a compact or structured form * **Decode** — recover the original data from the encoded form -For compression codecs, encoding means compressing and decoding means decompressing. But the codec abstraction extends beyond compression — it can represent hashing, checksums, binary encodings, and content-addressing transforms, all through the same `encode`/`decode` interface. +For compression codecs, encoding means compressing and decoding means +decompressing. ExCodecs is one framework with category APIs shaped for their +data: binary registry codecs use `ExCodecs.encode/3` / `decode/3`, while +point-cloud and Gaussian formats use `ExCodecs.Spatial`. ```elixir -# The universal codec interface: +# Binary registry interface: # {:ok, encoded} = ExCodecs.encode(:some_codec, data) # {:ok, decoded} = ExCodecs.decode(:some_codec, encoded) # decoded == data # round-trip guarantee +# +# Spatial category interface: +# {:ok, encoded} = ExCodecs.Spatial.encode(cloud, format: :ply) +# {:ok, decoded} = ExCodecs.Spatial.decode(encoded, format: :ply) ``` ## Why Codecs Matter @@ -54,9 +61,9 @@ A codec framework gives you a **single consistent API** over multiple algorithms ExCodecs is a **codec framework**, not just a compression library: -1. **Unified API** — `encode/3` and `decode/3` work identically across all codecs -2. **Runtime discovery** — query available codecs, check support, get metadata -3. **Extensible** — the `ExCodecs.Codec` behaviour lets you add new codec categories +1. **Specialized category APIs** — one framework without unsafe argument overloading +2. **Shared catalog** — query binary and spatial codecs, support, and metadata +3. **Extensible** — binary codecs use `ExCodecs.Codec`; domain categories can define suitable contracts 4. **NIF-native** — Rust-powered NIFs for production throughput 5. **Consistent errors** — structured `%ExCodecs.Error{}` for all failure modes @@ -104,8 +111,8 @@ IO.puts("Bzip2 block 9: #{byte_size(bz_max)} bytes") # Blosc2 shines with typed binary data data = :binary.copy(<<0, 0, 0, 0, 1, 1, 1, 1>>, 512) -{:ok, plain} = ExCodecs.encode(:blosc2, data, shuffle: :none) -{:ok, shuffled} = ExCodecs.encode(:blosc2, data, shuffle: :byte) +{:ok, plain} = ExCodecs.encode(:blosc2, data, typesize: 1, shuffle: :none) +{:ok, shuffled} = ExCodecs.encode(:blosc2, data, typesize: 1, shuffle: :byte) IO.puts("Original: #{byte_size(data)} bytes") IO.puts("Blosc2 (no shuffle): #{byte_size(plain)} bytes") @@ -116,7 +123,9 @@ IO.puts("Blosc2 (byte shuffle): #{byte_size(shuffled)} bytes") ```elixir codecs = ExCodecs.available_codecs() -IO.puts("Available codecs: #{inspect(codecs)}") +IO.puts("Shared catalog: #{inspect(codecs)}") +IO.puts("Compression: #{inspect(ExCodecs.available_codecs(:compression))}") +IO.puts("Spatial: #{inspect(ExCodecs.available_codecs(:spatial))}") ``` ### Codec Details @@ -127,6 +136,7 @@ for codec <- codecs do IO.puts(String.duplicate("-", 50)) IO.puts("Codec: #{info.name}") IO.puts("Category: #{info.category}") + IO.puts("Interface: #{info.interface}") IO.puts("Native?: #{info.native?}") IO.puts("Streaming?: #{info.streaming?}") IO.puts("Configurable?: #{info.configurable?}") @@ -138,11 +148,12 @@ end | Codec | Category | Configurable | Streaming | Best For | | --------- | ----------- | ---------------------- | --------- | ------------------------------ | -| `:zstd` | compression | Yes (level 1–22) | Yes | General-purpose, high ratio | -| `:lz4` | compression | Yes (level 1–16) | No | Real-time, low latency | +| `:zstd` | compression | Yes (level 1–22) | No | General-purpose, high ratio | +| `:lz4` | compression | No | No | Real-time, low latency | | `:snappy` | compression | No | No | Short-lived data, low overhead | | `:bzip2` | compression | Yes (block_size 1–9) | No | Archival, maximum ratio | -| `:blosc2` | compression | Yes (many options) | Yes | Numerical/array data | +| `:blosc2` | compression | Yes (codec/shuffle) | No | Numerical/array data | +| `:ply` / `:spatial_binary` / `:gsplat` | spatial | Format-specific | No | Point clouds / Gaussians | ## Error Handling diff --git a/livebooks/02_compression_fundamentals.livemd b/livebooks/02_compression_fundamentals.livemd index 016262d..60aa9ac 100644 --- a/livebooks/02_compression_fundamentals.livemd +++ b/livebooks/02_compression_fundamentals.livemd @@ -7,7 +7,7 @@ ex_codecs_dep = if File.exists?(local_path) do [{:ex_codecs, path: Path.join(__DIR__, "..")}, {:rustler, "~> 0.36"}] else - [{:ex_codecs, "~> 0.1"}] + [{:ex_codecs, "~> 0.2.0"}] end config = @@ -55,7 +55,11 @@ ExCodecs provides **lossless** codecs — decoded data is bit-for-bit identical ```elixir data = :crypto.strong_rand_bytes(8192) -for codec <- ExCodecs.available_codecs() do +compression_codecs = + ExCodecs.Compression.available_codecs() + |> Enum.map(& &1.name) + +for codec <- compression_codecs do {:ok, enc} = ExCodecs.encode(codec, data) {:ok, dec} = ExCodecs.decode(codec, enc) IO.puts("#{String.pad_trailing(inspect(codec), 10)} lossless: #{dec == data}") @@ -102,9 +106,9 @@ Blosc2 reorders bytes to create longer runs before applying an internal compress # Numerical data with patterns across float64 values floats = for i <- 1..2048, into: <<>>, do: <> -{:ok, blosc_none} = ExCodecs.encode(:blosc2, floats, shuffle: :none) -{:ok, blosc_byte} = ExCodecs.encode(:blosc2, floats, shuffle: :byte) -{:ok, blosc_bit} = ExCodecs.encode(:blosc2, floats, shuffle: :bit) +{:ok, blosc_none} = ExCodecs.encode(:blosc2, floats, typesize: 8, shuffle: :none) +{:ok, blosc_byte} = ExCodecs.encode(:blosc2, floats, typesize: 8, shuffle: :byte) +{:ok, blosc_bit} = ExCodecs.encode(:blosc2, floats, typesize: 8, shuffle: :bit) {:ok, zstd_plain} = ExCodecs.encode(:zstd, floats) IO.puts("Original: #{byte_size(floats)} bytes") diff --git a/livebooks/03_codec_comparison.livemd b/livebooks/03_codec_comparison.livemd index b5b372b..f3d3468 100644 --- a/livebooks/03_codec_comparison.livemd +++ b/livebooks/03_codec_comparison.livemd @@ -7,7 +7,7 @@ ex_codecs_dep = if File.exists?(local_path) do [{:ex_codecs, path: Path.join(__DIR__, "..")}, {:rustler, "~> 0.36"}] else - [{:ex_codecs, "~> 0.1"}] + [{:ex_codecs, "~> 0.2.0"}] end config = @@ -59,7 +59,10 @@ end ```elixir compression_results = for {dname, data} <- datasets, codec <- codecs do - opts = if codec == :blosc2, do: [cname: :zstd, clevel: 5, shuffle: :byte], else: [] + opts = + if codec == :blosc2, + do: [cname: :zstd, clevel: 5, shuffle: :byte, typesize: 8], + else: [] {:ok, enc} = ExCodecs.encode(codec, data, opts) %{ dataset: dname, @@ -104,7 +107,10 @@ VegaLite.new(width: 700, height: 350) iterations = 20 speed_results = for {dname, data} <- datasets, codec <- codecs do - opts = if codec == :blosc2, do: [cname: :zstd, clevel: 5, shuffle: :byte], else: [] + opts = + if codec == :blosc2, + do: [cname: :zstd, clevel: 5, shuffle: :byte, typesize: 8], + else: [] {:ok, enc} = ExCodecs.encode(codec, data, opts) {enc_time, _} = :timer.tc(fn -> @@ -159,7 +165,10 @@ VegaLite.new(width: 700, height: 350) ```elixir memory_results = for codec <- codecs do - opts = if codec == :blosc2, do: [cname: :zstd, clevel: 5, shuffle: :byte], else: [] + opts = + if codec == :blosc2, + do: [cname: :zstd, clevel: 5, shuffle: :byte, typesize: 8], + else: [] {:ok, info} = ExCodecs.codec_info(codec) mem_before = Process.info(self(), :heap_size) |> elem(1) @@ -238,7 +247,7 @@ recommendation = case {use_case_val, data_type_val} do {:tiny, _} -> {:snappy, "Low overhead even on very small payloads. No configuration needed."} {:ratio, :array} -> {:blosc2, "Shuffle+compress gives best ratios on typed arrays."} {:ratio, _} -> {:bzip2, "Highest compression ratio for general data. Slow but compact."} - {:numeric, _} -> {:blosc2, "Purpose-built for numerical data with shuffle filters and threading."} + {:numeric, _} -> {:blosc2, "Purpose-built for numerical data with shuffle filters."} {:balanced, :array} -> {:blosc2, "Good ratio on typed data with decent speed."} {:balanced, _} -> {:zstd, "Best all-around codec. Configurable from fast (level 1) to compact (level 22)."} end @@ -253,9 +262,9 @@ IO.puts("Streaming: #{info.streaming?}") default_opts = case codec do :zstd -> [level: 3] - :lz4 -> [level: 1] + :lz4 -> [] :bzip2 -> [block_size: 9] - :blosc2 -> [cname: :zstd, clevel: 5, shuffle: :byte] + :blosc2 -> [cname: :zstd, clevel: 5, shuffle: :byte, typesize: 8] :snappy -> [] end IO.puts("Suggested options: #{inspect(default_opts)}") @@ -293,11 +302,11 @@ IO.puts(flowchart) | ------------ | ------------ | ---------- | ------------ | ----------- | ------------- | | Speed | Very Fast | Very Fast | Fast | Slow | Medium | | Ratio | Low | Low | High | Very High | High (arrays) | -| Configurable | Level 1–16 | No | Level 1–22 | Block 1–9 | Many options | -| Streaming | No | No | Yes | No | Yes | +| Configurable | Fixed profile | No | Level 1–22 | Block 1–9 | Codec/shuffle | +| Streaming | No | No | No | No | No | | Best For | Hot paths | Short data | General | Archival | Arrays | | Shuffle | — | — | — | — | Byte/Bit | -| Multi-thread | No | No | No | No | Yes | +| Multi-thread | No | No | No | No | No | ## Next Steps diff --git a/livebooks/04_building_storage_systems.livemd b/livebooks/04_building_storage_systems.livemd index 72974f5..ed9877f 100644 --- a/livebooks/04_building_storage_systems.livemd +++ b/livebooks/04_building_storage_systems.livemd @@ -7,7 +7,7 @@ ex_codecs_dep = if File.exists?(local_path) do [{:ex_codecs, path: Path.join(__DIR__, "..")}, {:rustler, "~> 0.36"}] else - [{:ex_codecs, "~> 0.1"}] + [{:ex_codecs, "~> 0.2.0"}] end config = @@ -124,7 +124,7 @@ end ### Using the Compressed Store ```elixir - {:ok, _pid} = CompressedStore.start_link(codec: :zstd, level: 3) +{:ok, _pid} = CompressedStore.start_link(codec: :zstd, opts: [level: 3]) CompressedStore.put(:doc1, String.duplicate("Hello, World! ", 1000)) CompressedStore.put(:doc2, :crypto.strong_rand_bytes(4096) |> Base.encode64()) @@ -308,6 +308,12 @@ case ExCodecs.encode(:zstd, "some data") do {:error, %ExCodecs.Error{reason: :unsupported_codec}} -> {:error, :codec_missing} + {:error, %ExCodecs.Error{reason: :codec_unavailable}} -> + {:error, :codec_unavailable} + + {:error, %ExCodecs.Error{reason: :nif_not_loaded}} -> + {:error, :nif_not_loaded} + {:error, %ExCodecs.Error{reason: :invalid_data} = err} -> IO.puts("Invalid data: #{err.message}") {:error, :bad_input} @@ -315,9 +321,23 @@ case ExCodecs.encode(:zstd, "some data") do {:error, %ExCodecs.Error{reason: :compression_failed} = err} -> IO.puts("Compression failed: #{err.message}") {:error, :compress_failed} + + {:error, %ExCodecs.Error{} = err} -> + IO.puts("Structured error #{err.reason}: #{err.message}") + {:error, err.reason} end ``` +```elixir +# Bound decompression for untrusted payloads (default is 256 MiB) +{:ok, compressed} = ExCodecs.encode(:zstd, String.duplicate("x", 1024)) + +{:error, %ExCodecs.Error{reason: :output_limit_exceeded}} = + ExCodecs.decode(:zstd, compressed, max_output_size: 16) + +{:ok, _decoded} = ExCodecs.decode(:zstd, compressed, max_output_size: 4096) +``` + ```elixir defmodule SafeCompress do def call(codec, data, opts \\ []) do diff --git a/livebooks/05_zarr_style_workloads.livemd b/livebooks/05_zarr_style_workloads.livemd index 3c13813..8110579 100644 --- a/livebooks/05_zarr_style_workloads.livemd +++ b/livebooks/05_zarr_style_workloads.livemd @@ -7,7 +7,7 @@ ex_codecs_dep = if File.exists?(local_path) do [{:ex_codecs, path: Path.join(__DIR__, "..")}, {:rustler, "~> 0.36"}] else - [{:ex_codecs, "~> 0.1"}] + [{:ex_codecs, "~> 0.2.0"}] end config = @@ -75,11 +75,11 @@ The shuffle filter is the key to Blosc2's effectiveness on array data: data = :binary.copy(<<1.0::float-64>>, 50_000) <> :binary.copy(<<2.0::float-64>>, 50_000) # No shuffle -{:ok, c_none} = ExCodecs.encode(:blosc2, data, shuffle: :none) +{:ok, c_none} = ExCodecs.encode(:blosc2, data, typesize: 8, shuffle: :none) # Byte shuffle - reorders bytes for better compression -{:ok, c_byte} = ExCodecs.encode(:blosc2, data, shuffle: :byte) +{:ok, c_byte} = ExCodecs.encode(:blosc2, data, typesize: 8, shuffle: :byte) # Bit shuffle - reorders bits for even better compression on some data -{:ok, c_bit} = ExCodecs.encode(:blosc2, data, shuffle: :bit) +{:ok, c_bit} = ExCodecs.encode(:blosc2, data, typesize: 8, shuffle: :bit) IO.puts("No shuffle: #{byte_size(c_none)} bytes") IO.puts("Byte shuffle: #{byte_size(c_byte)} bytes") diff --git a/livebooks/06_spatial_codecs.livemd b/livebooks/06_spatial_codecs.livemd new file mode 100644 index 0000000..9ebfdf8 --- /dev/null +++ b/livebooks/06_spatial_codecs.livemd @@ -0,0 +1,210 @@ +# Spatial Codecs: Point Clouds and Gaussian Splats + +```elixir +local_path = Path.join(__DIR__, "../mix.exs") + +ex_codecs_dep = + if File.exists?(local_path) do + [{:ex_codecs, path: Path.join(__DIR__, "..")}, {:rustler, "~> 0.36"}] + else + [{:ex_codecs, "~> 0.2.0"}] + end + +config = + if File.exists?(local_path) do + [rustler_precompiled: [force_build: [ex_codecs: true]]] + else + [] + end + +Mix.install(ex_codecs_dep, config: config) +``` + +## One Framework, Specialized Category APIs + +Compression codecs and spatial formats share discovery metadata and +`%ExCodecs.Error{}` results. Their operation APIs differ because compression +maps binary to binary, while spatial codecs map domain structs to formats. + +```elixir +ExCodecs.available_codecs(:spatial) +``` + +```elixir +for format <- ExCodecs.Spatial.available_formats() do + {:ok, info} = ExCodecs.codec_info(format) + + %{ + format: info.name, + interface: info.interface, + configurable?: info.configurable?, + version: info.version + } +end +``` + +## Build a Point Cloud + +`Point.new/4` stores coordinates as floats and normalizes attribute keys to +strings. `PointCloud.new/2` computes axis-aligned bounds by default. + +```elixir +alias ExCodecs.Spatial.{Gaussian, GaussianCloud, Point, PointCloud} + +points = [ + Point.new(0, 0, 0, + color: {255, 32, 32}, + normal: {0.0, 0.0, 1.0}, + attributes: %{intensity: 0.25} + ), + Point.new(1, 0, 0, + color: {32, 255, 32}, + normal: {0.0, 0.0, 1.0}, + attributes: %{intensity: 0.5} + ), + Point.new(0, 1, 0, + color: {32, 32, 255}, + normal: {0.0, 0.0, 1.0}, + attributes: %{intensity: 0.75} + ) +] + +cloud = PointCloud.new(points) + +%{ + points: PointCloud.size(cloud), + bounds: cloud.bounds, + attribute_keys: cloud.points |> hd() |> Map.fetch!(:attributes) |> Map.keys() +} +``` + +## PLY Interchange + +PLY supports ASCII and binary little-/big-endian representations. The default +is binary little-endian. + +```elixir +{:ok, ply_ascii} = + ExCodecs.Spatial.encode(cloud, + format: :ply, + ply_format: :ascii, + comments: ["created by the ExCodecs spatial Livebook"] + ) + +ply_ascii +|> String.split("\n") +|> Enum.take(14) +|> Enum.join("\n") +``` + +```elixir +{:ok, ply_binary} = ExCodecs.Spatial.encode(cloud, format: :ply) +{:ok, decoded_ply} = ExCodecs.Spatial.decode(ply_binary, format: :ply) + +%{ + encoded_bytes: byte_size(ply_binary), + decoded_points: PointCloud.size(decoded_ply), + first_point: hd(decoded_ply.points) +} +``` + +## Compact Point-Cloud Binary + +`:spatial_binary` uses the versioned ExCodecs point format (`EXCP`). It is +intended for compact ExCodecs-to-ExCodecs interchange. + +```elixir +{:ok, excp} = ExCodecs.Spatial.encode(cloud, format: :spatial_binary) +{:ok, decoded_excp} = ExCodecs.Spatial.decode(excp, format: :spatial_binary) + +%{ + magic: binary_part(excp, 0, 4), + encoded_bytes: byte_size(excp), + decoded_points: PointCloud.size(decoded_excp) +} +``` + +## Spatial Encoding Plus Compression + +Spatial encoding chooses a geometry format. Compression is a separate, +composable binary step. + +```elixir +{:ok, compressed_excp} = ExCodecs.encode(:zstd, excp, level: 7) +{:ok, restored_excp} = ExCodecs.decode(:zstd, compressed_excp) +{:ok, restored_cloud} = + ExCodecs.Spatial.decode(restored_excp, format: :spatial_binary) + +%{ + excp_bytes: byte_size(excp), + compressed_bytes: byte_size(compressed_excp), + round_trip_points: PointCloud.size(restored_cloud) +} +``` + +## Gaussian Splats + +`Gaussian` uses scalar-first quaternions (`{w, x, y, z}`). `:gsplat` is the +versioned ExCodecs Gaussian format (`GSPL`). + +```elixir +gaussian_cloud = + GaussianCloud.new([ + Gaussian.new({0, 0, 0}, + scale: {0.1, 0.2, 0.1}, + opacity: 0.9, + color: {1.0, 0.2, 0.1} + ), + Gaussian.new({1, 0.5, -0.25}, + rotation: {0.9239, 0.0, 0.3827, 0.0}, + scale: {0.25, 0.1, 0.15}, + opacity: 0.65, + color: {0.1, 0.4, 1.0} + ) + ]) + +{:ok, gspl} = ExCodecs.Spatial.encode(gaussian_cloud, format: :gsplat) +{:ok, decoded_gaussians} = ExCodecs.Spatial.decode(gspl, format: :gsplat) + +%{ + magic: binary_part(gspl, 0, 4), + encoded_bytes: byte_size(gspl), + decoded_gaussians: GaussianCloud.size(decoded_gaussians) +} +``` + +## Enumerable Helpers + +The current `stream_encode/2` and `stream_decode/2` names describe an +enumerable-facing API. In v0.2.0 they still collect the complete enumerable or +payload in memory; they are not incremental file I/O. + +```elixir +{:ok, streamed_payload} = + ExCodecs.Spatial.stream_encode(points, format: :spatial_binary) + +streamed_points = + streamed_payload + |> ExCodecs.Spatial.stream_decode(format: :spatial_binary, source: :binary) + |> Enum.to_list() + +length(streamed_points) +``` + +## Category-Safe Dispatch + +The shared catalog does not overload the binary API with struct inputs. +Choosing a spatial catalog entry through `ExCodecs.encode/3` returns guidance +to use the spatial category API. + +```elixir +{:error, error} = ExCodecs.encode(:ply, ply_binary) + +%{reason: error.reason, message: error.message} +``` + +## Next Steps + +* Read **Understanding Spatial Codecs** for schema and format trade-offs. +* Read **Spatial Wire Formats** for the frozen EXCP and GSPL layouts. +* Add Zstd after spatial encoding when storage or transfer size matters. diff --git a/mix.exs b/mix.exs index 692a542..8989c44 100644 --- a/mix.exs +++ b/mix.exs @@ -19,7 +19,7 @@ defmodule ExCodecs.MixProject do test_coverage: [ tool: ExCoveralls, ignore_modules: [ExCodecs.Native], - threshold: 84 + threshold: 95 ], preferred_cli_env: [ coveralls: :test, @@ -85,6 +85,9 @@ defmodule ExCodecs.MixProject do "native/ex_codecs_native/Cargo.toml", "native/ex_codecs_native/Cargo.lock", "priv", + "guides", + "livebooks", + "docs", "checksum-*.exs", "mix.exs", "README.md", @@ -98,7 +101,15 @@ defmodule ExCodecs.MixProject do main: "ExCodecs", source_url: @source_url, source_ref: "v#{@version}", - extras: Path.wildcard("guides/**/*.md") ++ Path.wildcard("livebooks/**/*.livemd") + extras: + Path.wildcard("guides/**/*.md") ++ + Path.wildcard("livebooks/**/*.livemd") ++ + ["docs/spatial_formats.md"], + groups_for_extras: [ + Guides: ~r"guides/", + Livebooks: ~r"livebooks/", + "Architecture & formats": ~r"docs/" + ] ] end diff --git a/native/ex_codecs_native/Cargo.lock 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[dependencies] rustler = { version = "0.36", default-features = false, features = ["derive"] } # Pure-Rust codecs only — no C compression toolchain (no cmake/c-blosc2). -ruzstd = "0.8" +structured-zstd = "0.0.48" lz4_flex = "0.11" snap = "1.1" flate2 = { version = "1", default-features = false, features = ["rust_backend"] } diff --git a/native/ex_codecs_native/src/atoms.rs b/native/ex_codecs_native/src/atoms.rs index c573288..68c9caf 100644 --- a/native/ex_codecs_native/src/atoms.rs +++ b/native/ex_codecs_native/src/atoms.rs @@ -10,4 +10,5 @@ atoms! { compression_failed, decompression_failed, nif_not_loaded, -} \ No newline at end of file + output_limit_exceeded, +} diff --git a/native/ex_codecs_native/src/blosc2_codec.rs b/native/ex_codecs_native/src/blosc2_codec.rs index 36e5601..a44bfbd 100644 --- a/native/ex_codecs_native/src/blosc2_codec.rs +++ b/native/ex_codecs_native/src/blosc2_codec.rs @@ -60,13 +60,15 @@ pub fn blosc2_compress<'a>( return err(env, atoms::invalid_data()); } - let mut cparams = CParams::default(); - cparams.compcode = compcode; - cparams.clevel = clevel; - cparams.typesize = typesize; - cparams.nthreads = 1; - cparams.filters = [0, 0, 0, 0, 0, filter]; - cparams.filters_meta = [0; 6]; + let cparams = CParams { + compcode, + clevel, + typesize, + nthreads: 1, + filters: [0, 0, 0, 0, 0, filter], + filters_meta: [0; 6], + ..Default::default() + }; let ctx = match blosc2_create_cctx(cparams) { Ok(ctx) => ctx, @@ -91,12 +93,14 @@ pub fn blosc2_compress<'a>( // Destination too small — retry with a larger buffer. let destsize2 = ((src.len() * 2) + BLOSC2_MAX_OVERHEAD).max(BLOSC2_MAX_OVERHEAD) as i32; let mut dest2 = vec![0u8; destsize2 as usize]; - let mut cparams2 = CParams::default(); - cparams2.compcode = compcode; - cparams2.clevel = clevel; - cparams2.typesize = typesize; - cparams2.nthreads = 1; - cparams2.filters = [0, 0, 0, 0, 0, filter]; + let cparams2 = CParams { + compcode, + clevel, + typesize, + nthreads: 1, + filters: [0, 0, 0, 0, 0, filter], + ..Default::default() + }; let Ok(ctx2) = blosc2_create_cctx(cparams2) else { return err(env, atoms::compression_failed()); }; @@ -114,20 +118,22 @@ pub fn blosc2_compress<'a>( } #[rustler::nif(schedule = "DirtyCpu")] -pub fn blosc2_decompress<'a>(env: Env<'a>, data: Binary) -> Term<'a> { +pub fn blosc2_decompress<'a>(env: Env<'a>, data: Binary, max_output_size: u64) -> Term<'a> { if data.len() < 16 { return err(env, atoms::invalid_data()); } // nbytes at offset 4 (little-endian int32) in the Blosc chunk header. let nbytes = u32::from_le_bytes([data[4], data[5], data[6], data[7]]) as usize; - // Cap single-chunk decompress to 1 GiB. - if nbytes > (1usize << 30) { - return err(env, atoms::invalid_data()); + // Cap single-chunk decompress to 1 GiB, and to the caller-supplied limit. + if nbytes > (1usize << 30) || !crate::util::output_within_limit(nbytes, max_output_size) { + return err(env, atoms::output_limit_exceeded()); } - let mut dparams = DParams::default(); - dparams.nthreads = 1; + let dparams = DParams { + nthreads: 1, + ..Default::default() + }; let ctx = match blosc2_create_dctx(dparams) { Ok(ctx) => ctx, Err(_) => return err(env, atoms::decompression_failed()), diff --git a/native/ex_codecs_native/src/bzip2_codec.rs b/native/ex_codecs_native/src/bzip2_codec.rs index e48c1cd..604bcb9 100644 --- a/native/ex_codecs_native/src/bzip2_codec.rs +++ b/native/ex_codecs_native/src/bzip2_codec.rs @@ -2,7 +2,7 @@ use rustler::{Binary, Env, Term}; use std::io::{Read, Write}; use crate::atoms; -use crate::util::{err, ok_binary}; +use crate::util::{err, ok_binary, output_within_limit}; pub fn version() -> String { "bzip2-0.6/libbz2-rs".to_string() @@ -30,18 +30,32 @@ pub fn bzip2_compress<'a>(env: Env<'a>, data: Binary, block_size: u32) -> Term<' } #[rustler::nif(schedule = "DirtyCpu")] -pub fn bzip2_decompress<'a>(env: Env<'a>, data: Binary) -> Term<'a> { - let result: Result, std::io::Error> = (|| { - let mut decompressed = Vec::with_capacity(data.len() * 4); - { - let mut reader = bzip2::read::BzDecoder::new(data.as_slice()); - reader.read_to_end(&mut decompressed)?; +pub fn bzip2_decompress<'a>(env: Env<'a>, data: Binary, max_output_size: u64) -> Term<'a> { + let result: Result, LimitError> = (|| { + let mut decompressed = Vec::with_capacity(data.len().saturating_mul(4).min(64 * 1024)); + let mut reader = bzip2::read::BzDecoder::new(data.as_slice()); + let mut buf = [0u8; 8192]; + loop { + let n = reader.read(&mut buf).map_err(|_| LimitError::Io)?; + if n == 0 { + break; + } + if !output_within_limit(decompressed.len().saturating_add(n), max_output_size) { + return Err(LimitError::Limit); + } + decompressed.extend_from_slice(&buf[..n]); } Ok(decompressed) })(); match result { Ok(decompressed) => ok_binary(env, &decompressed), - Err(_) => err(env, atoms::decompression_failed()), + Err(LimitError::Limit) => err(env, atoms::output_limit_exceeded()), + Err(LimitError::Io) => err(env, atoms::decompression_failed()), } } + +enum LimitError { + Limit, + Io, +} diff --git a/native/ex_codecs_native/src/lz4_codec.rs b/native/ex_codecs_native/src/lz4_codec.rs index fa67a48..a46ff5b 100644 --- a/native/ex_codecs_native/src/lz4_codec.rs +++ b/native/ex_codecs_native/src/lz4_codec.rs @@ -1,7 +1,7 @@ use rustler::{Binary, Env, Term}; use crate::atoms; -use crate::util::{err, ok_binary}; +use crate::util::{err, ok_binary, output_within_limit}; pub fn version() -> String { "lz4_flex-0.11".to_string() @@ -14,9 +14,23 @@ pub fn lz4_compress<'a>(env: Env<'a>, data: Binary) -> Term<'a> { } #[rustler::nif(schedule = "DirtyCpu")] -pub fn lz4_decompress<'a>(env: Env<'a>, data: Binary) -> Term<'a> { - match lz4_flex::decompress_size_prepended(data.as_slice()) { - Ok(decompressed) => ok_binary(env, &decompressed), +pub fn lz4_decompress<'a>(env: Env<'a>, data: Binary, max_output_size: u64) -> Term<'a> { + let slice = data.as_slice(); + if slice.len() < 4 { + return err(env, atoms::decompression_failed()); + } + let claimed = u32::from_le_bytes([slice[0], slice[1], slice[2], slice[3]]) as usize; + if !output_within_limit(claimed, max_output_size) { + return err(env, atoms::output_limit_exceeded()); + } + + match lz4_flex::decompress_size_prepended(slice) { + Ok(decompressed) => { + if !output_within_limit(decompressed.len(), max_output_size) { + return err(env, atoms::output_limit_exceeded()); + } + ok_binary(env, &decompressed) + } Err(_) => err(env, atoms::decompression_failed()), } } diff --git a/native/ex_codecs_native/src/snappy_codec.rs b/native/ex_codecs_native/src/snappy_codec.rs index 4f8100c..741bb18 100644 --- a/native/ex_codecs_native/src/snappy_codec.rs +++ b/native/ex_codecs_native/src/snappy_codec.rs @@ -1,7 +1,7 @@ use rustler::{Binary, Env, Term}; use crate::atoms; -use crate::util::{err, ok_binary}; +use crate::util::{err, ok_binary, output_within_limit}; pub fn version() -> String { "snap-1.1".to_string() @@ -17,10 +17,23 @@ pub fn snappy_compress<'a>(env: Env<'a>, data: Binary) -> Term<'a> { } #[rustler::nif(schedule = "DirtyCpu")] -pub fn snappy_decompress<'a>(env: Env<'a>, data: Binary) -> Term<'a> { +pub fn snappy_decompress<'a>(env: Env<'a>, data: Binary, max_output_size: u64) -> Term<'a> { + match snap::raw::decompress_len(data.as_slice()) { + Ok(claimed) if !output_within_limit(claimed, max_output_size) => { + return err(env, atoms::output_limit_exceeded()); + } + Ok(_) => {} + Err(_) => return err(env, atoms::decompression_failed()), + } + let mut decoder = snap::raw::Decoder::new(); match decoder.decompress_vec(data.as_slice()) { - Ok(decompressed) => ok_binary(env, &decompressed), + Ok(decompressed) => { + if !output_within_limit(decompressed.len(), max_output_size) { + return err(env, atoms::output_limit_exceeded()); + } + ok_binary(env, &decompressed) + } Err(_) => err(env, atoms::decompression_failed()), } } diff --git a/native/ex_codecs_native/src/util.rs b/native/ex_codecs_native/src/util.rs index 4eab0e7..1c6b25d 100644 --- a/native/ex_codecs_native/src/util.rs +++ b/native/ex_codecs_native/src/util.rs @@ -2,6 +2,11 @@ use rustler::{Binary, Encoder, Env, OwnedBinary, Term}; use crate::atoms; +/// Returns true when `len` fits within the caller-supplied decompress ceiling. +pub fn output_within_limit(len: usize, max_output_size: u64) -> bool { + (len as u64) <= max_output_size +} + /// Copy bytes into an Erlang binary term. /// /// Returns `Ok(binary_term)` or `Err` when allocation fails so callers never diff --git a/native/ex_codecs_native/src/zstd_codec.rs b/native/ex_codecs_native/src/zstd_codec.rs index f1228d0..3142ca6 100644 --- a/native/ex_codecs_native/src/zstd_codec.rs +++ b/native/ex_codecs_native/src/zstd_codec.rs @@ -2,38 +2,44 @@ use rustler::{Binary, Env, Term}; use std::io::Read; use crate::atoms; -use crate::util::{err, ok_binary}; +use crate::util::{err, ok_binary, output_within_limit}; + +use structured_zstd::encoding::{compress_to_vec, CompressionLevel}; pub fn version() -> String { - "ruzstd-0.8".to_string() + "structured-zstd-0.0.48".to_string() } -fn compression_level(level: i32) -> ruzstd::encoding::CompressionLevel { - // ruzstd only fully implements Fastest today; map all positive levels there - // and keep Uncompressed for level 0 edge cases (Elixir validates 1..=22). - match level { - i if i <= 0 => ruzstd::encoding::CompressionLevel::Uncompressed, - _ => ruzstd::encoding::CompressionLevel::Fastest, - } +fn compression_level(level: i32) -> CompressionLevel { + // Pure-Rust encoder with numeric levels 1..=22 (no C libzstd). + CompressionLevel::from_level(level.clamp(1, 22)) } #[rustler::nif(schedule = "DirtyCpu")] pub fn zstd_compress<'a>(env: Env<'a>, data: Binary, level: i32) -> Term<'a> { - let level = level.clamp(1, 22); - let compressed = - ruzstd::encoding::compress_to_vec(data.as_slice(), compression_level(level)); + let compressed = compress_to_vec(data.as_slice(), compression_level(level)); ok_binary(env, &compressed) } #[rustler::nif(schedule = "DirtyCpu")] -pub fn zstd_decompress<'a>(env: Env<'a>, data: Binary) -> Term<'a> { - match ruzstd::decoding::StreamingDecoder::new(data.as_slice()) { +pub fn zstd_decompress<'a>(env: Env<'a>, data: Binary, max_output_size: u64) -> Term<'a> { + match structured_zstd::decoding::StreamingDecoder::new(data.as_slice()) { Ok(mut decoder) => { let mut out = Vec::new(); - match decoder.read_to_end(&mut out) { - Ok(_) => ok_binary(env, &out), - Err(_) => err(env, atoms::decompression_failed()), + let mut buf = [0u8; 8192]; + loop { + match decoder.read(&mut buf) { + Ok(0) => break, + Ok(n) => { + if !output_within_limit(out.len().saturating_add(n), max_output_size) { + return err(env, atoms::output_limit_exceeded()); + } + out.extend_from_slice(&buf[..n]); + } + Err(_) => return err(env, atoms::decompression_failed()), + } } + ok_binary(env, &out) } Err(_) => err(env, atoms::decompression_failed()), } diff --git a/test/ex_codecs/codec_registry_test.exs b/test/ex_codecs/codec_registry_test.exs index f1c2e15..836235b 100644 --- a/test/ex_codecs/codec_registry_test.exs +++ b/test/ex_codecs/codec_registry_test.exs @@ -77,6 +77,15 @@ defmodule ExCodecs.CodecRegistryTest do codecs = CodecRegistry.available_codecs() assert :zstd in codecs assert :lz4 in codecs + assert :ply in codecs + assert :spatial_binary in codecs + assert :gsplat in codecs + end + + test "filters available codecs by category" do + assert CodecRegistry.available_codecs(:spatial) == [:gsplat, :ply, :spatial_binary] + assert :zstd in CodecRegistry.available_codecs(:compression) + refute :ply in CodecRegistry.available_codecs(:compression) end end @@ -115,6 +124,14 @@ defmodule ExCodecs.CodecRegistryTest do test "returns error for unknown codec" do assert {:error, :unsupported_codec} = CodecRegistry.codec_info(:nonexistent_codec_xyz) end + + test "returns interface metadata for spatial formats" do + assert {:ok, info} = CodecRegistry.codec_info(:ply) + assert info.category == :spatial + assert info.interface == :spatial + assert info.configurable? + assert info.version == "PLY 1.0" + end end describe "codecs_by_category/1" do @@ -129,6 +146,12 @@ defmodule ExCodecs.CodecRegistryTest do test "returns empty list for unknown category" do assert [] = CodecRegistry.codecs_by_category(:nonexistent_category_xyz) end + + test "returns shared-catalog spatial entries" do + codecs = CodecRegistry.codecs_by_category(:spatial) + assert Enum.map(codecs, & &1.name) == [:gsplat, :ply, :spatial_binary] + assert Enum.all?(codecs, &(&1.interface == :spatial)) + end end describe "unregister/1" do diff --git a/test/ex_codecs/codec_test.exs b/test/ex_codecs/codec_test.exs index 0e3c961..7f888ac 100644 --- a/test/ex_codecs/codec_test.exs +++ b/test/ex_codecs/codec_test.exs @@ -17,6 +17,7 @@ defmodule ExCodecs.CodecTest do assert codec.name == :zstd assert codec.category == :compression + assert codec.interface == :binary assert codec.module == ExCodecs.Compression.Zstd assert codec.native? == true assert codec.streaming? == true @@ -27,6 +28,7 @@ defmodule ExCodecs.CodecTest do test "has default values" do codec = %Codec{name: :test} assert codec.category == nil + assert codec.interface == :binary assert codec.module == nil assert codec.native? == nil assert codec.streaming? == nil diff --git a/test/ex_codecs/compression/lz4_test.exs b/test/ex_codecs/compression/lz4_test.exs index 4bdd1c7..228b048 100644 --- a/test/ex_codecs/compression/lz4_test.exs +++ b/test/ex_codecs/compression/lz4_test.exs @@ -48,6 +48,14 @@ defmodule ExCodecs.Compression.Lz4Test do test "returns error for corrupt data" do assert {:error, _} = Lz4.decode(<<0, 1, 2, 3>>, []) end + + test "rejects decompress when max_output_size is too small" do + data = String.duplicate("ab", 10_000) + {:ok, compressed} = Lz4.encode(data, []) + + assert {:error, %ExCodecs.Error{reason: :output_limit_exceeded}} = + Lz4.decode(compressed, max_output_size: 16) + end end describe "__codec_info__/0" do diff --git a/test/ex_codecs/compression/zstd_test.exs b/test/ex_codecs/compression/zstd_test.exs index 36e7f1a..50c1b7f 100644 --- a/test/ex_codecs/compression/zstd_test.exs +++ b/test/ex_codecs/compression/zstd_test.exs @@ -20,12 +20,32 @@ defmodule ExCodecs.Compression.ZstdTest do end test "higher levels produce smaller or equal output" do - data = :crypto.strong_rand_bytes(10_000) + # Random data is poorly compressible; use repetitive payload so buckets matter. + data = String.duplicate("AAAA", 5_000) {:ok, c1} = Zstd.encode(data, level: 1) {:ok, c19} = Zstd.encode(data, level: 19) assert byte_size(c19) <= byte_size(c1) end + test "level buckets produce distinct frames for compressible data" do + # Varied compressible payload so numeric levels diverge. + data = + for i <- 1..8_000, into: <<>> do + <> + end + + {:ok, l1} = Zstd.encode(data, level: 1) + {:ok, l3} = Zstd.encode(data, level: 3) + {:ok, l15} = Zstd.encode(data, level: 15) + + distinct = MapSet.new([l1, l3, l15]) + assert MapSet.size(distinct) >= 2 + + for frame <- [l1, l3, l15] do + assert {:ok, ^data} = Zstd.decode(frame, []) + end + end + test "level effectiveness: higher levels produce smaller or equal output for compressible data" do data = String.duplicate("Hello, World! ", 10_000) {:ok, c1} = Zstd.encode(data, level: 1) @@ -83,6 +103,21 @@ defmodule ExCodecs.Compression.ZstdTest do test "returns error for invalid data" do assert {:error, _} = Zstd.decode("not compressed", []) end + + test "rejects decompress when max_output_size is too small" do + data = String.duplicate("AAAA", 256) + {:ok, compressed} = Zstd.encode(data, []) + + assert {:error, %ExCodecs.Error{reason: :output_limit_exceeded}} = + Zstd.decode(compressed, max_output_size: 8) + end + + test "rejects invalid max_output_size" do + {:ok, compressed} = Zstd.encode("hi", []) + + assert {:error, %ExCodecs.Error{reason: :invalid_options}} = + Zstd.decode(compressed, max_output_size: 0) + end end describe "__codec_info__/0" do diff --git a/test/ex_codecs/coverage_boost_test.exs b/test/ex_codecs/coverage_boost_test.exs new file mode 100644 index 0000000..ceac9c4 --- /dev/null +++ b/test/ex_codecs/coverage_boost_test.exs @@ -0,0 +1,435 @@ +defmodule ExCodecs.CoverageBoostTest do + use ExUnit.Case, async: true + + alias ExCodecs.Compression.{Bzip2, Lz4, Snappy, Zstd} + alias ExCodecs.NIF + alias ExCodecs.Spatial + alias ExCodecs.Spatial.Codec.{Binary, Gsplat, PLY} + alias ExCodecs.Spatial.{Gaussian, GaussianCloud, Point, PointCloud} + alias ExCodecs.Spatial.Stream, as: SpatialStream + + describe "point cloud bounds expansion and add_points" do + test "expands existing bounds and bulk-adds points" do + cloud = PointCloud.new([Point.new(0, 0, 0)]) + cloud = PointCloud.add_point(cloud, Point.new(2, -1, 3)) + assert cloud.bounds.min_x == 0.0 + assert cloud.bounds.max_x == 2.0 + assert cloud.bounds.min_y == -1.0 + assert cloud.bounds.max_z == 3.0 + + cloud = PointCloud.add_points(cloud, [Point.new(5, 5, 5), Point.new(-2, 0, 0)]) + assert PointCloud.size(cloud) == 4 + assert cloud.bounds.max_x == 5.0 + assert cloud.bounds.min_x == -2.0 + end + end + + describe "compression invalid_data catch-alls" do + test "encode/decode reject non-binaries" do + for {mod, codec} <- [ + {Zstd, :zstd}, + {Lz4, :lz4}, + {Snappy, :snappy}, + {Bzip2, :bzip2} + ] do + assert {:error, %ExCodecs.Error{reason: :invalid_data, codec: ^codec}} = + mod.encode(123, []) + + assert {:error, %ExCodecs.Error{reason: :invalid_data, codec: ^codec}} = + mod.decode(123, []) + end + end + end + + describe "top-level catch-alls and NIF helpers" do + test "encode/decode reject completely invalid argument shapes" do + assert {:error, %ExCodecs.Error{reason: :invalid_data}} = + ExCodecs.encode("not-an-atom", "data") + + assert {:error, %ExCodecs.Error{reason: :invalid_data}} = + ExCodecs.decode("not-an-atom", "data") + end + + test "NIF wrap and safe_call edge paths" do + assert NIF.default_max_output_size() == 268_435_456 + + assert {:error, %ExCodecs.Error{reason: :invalid_data, message: message}} = + NIF.wrap(:zstd, :unexpected) + + assert message =~ "Unexpected NIF return" + + assert {:error, %ExCodecs.Error{reason: :nif_not_loaded, codec: :lz4}} = + NIF.safe_call(:lz4, fn -> raise ErlangError, original: :nif_not_loaded end) + + assert {:error, %ExCodecs.Error{reason: :invalid_data, codec: :lz4, details: :boom}} = + NIF.safe_call(:lz4, fn -> raise ErlangError, original: :boom end) + + assert {:error, %ExCodecs.Error{reason: :invalid_data, codec: :snappy, message: msg}} = + NIF.safe_call(:snappy, fn -> raise ArgumentError, message: "bad arg" end) + + assert msg =~ "bad arg" + end + end + + describe "spatial stream edges" do + test "missing format and file/binary source resolution" do + assert [{:error, %{reason: :invalid_options}}] = + SpatialStream.decode(<<"ply">>, []) |> Enum.to_list() + + assert {:error, %{reason: :invalid_options}} = + SpatialStream.encode([Point.new(0, 0, 0)], []) + + path = + Path.join(System.tmp_dir!(), "ex_codecs_cov_#{System.unique_integer([:positive])}.excp") + + on_exit(fn -> File.rm(path) end) + + cloud = PointCloud.new([Point.new(1, 2, 3)]) + assert :ok = SpatialStream.encode_to_file(cloud, path, format: :spatial_binary) + + assert [%Point{}] = + Spatial.stream_decode(path, format: :spatial_binary, source: :file) + |> Enum.to_list() + + {:ok, bin} = Spatial.encode(cloud, format: :spatial_binary) + + assert [%Point{}] = + Spatial.stream_decode(bin, format: :spatial_binary, source: :binary) + |> Enum.to_list() + + assert [{:error, %{reason: :io_error}}] = + Spatial.stream_decode("/no/such/ex_codecs_file.excp", + format: :spatial_binary, + source: :file + ) + |> Enum.to_list() + + assert [{:error, %{reason: :io_error}}] = + Spatial.stream_decode("/no/such/ex_codecs_file.gspl", + format: :gsplat, + source: :file + ) + |> Enum.to_list() + end + end + + describe "binary codec nil-color and truncation" do + test "encodes mixed color presence and rejects truncated payloads" do + rgb_cloud = + PointCloud.new([ + Point.new(0, 0, 0, color: {1, 2, 3}), + Point.new(1, 1, 1) + ]) + + assert {:ok, rgb_bin} = Binary.encode(rgb_cloud) + assert {:ok, _} = Binary.decode(rgb_bin) + + rgba_cloud = + PointCloud.new([ + Point.new(0, 0, 0, color: {1, 2, 3, 4}), + Point.new(1, 1, 1, color: {5, 6, 7}), + Point.new(2, 2, 2) + ]) + + assert {:ok, rgba_bin} = Binary.encode(rgba_cloud) + assert {:ok, decoded} = Binary.decode(rgba_bin) + assert length(decoded.points) == 3 + + normal_cloud = + PointCloud.new([ + Point.new(0, 0, 0, normal: {0.0, 1.0, 0.0}), + Point.new(1, 1, 1) + ]) + + assert {:ok, _} = Binary.encode(normal_cloud) + + # flags: color + assert {:error, %{message: message}} = + Binary.decode( + <<"EXCP", 1::little-16, 1::little-16, 1::little-64, 0::float-32-little, + 0::float-32-little, 0::float-32-little, 1, 2>> + ) + + assert message =~ "Truncated RGB" + + # flags: alpha + assert {:error, %{message: message}} = + Binary.decode( + <<"EXCP", 1::little-16, 3::little-16, 1::little-64, 0::float-32-little, + 0::float-32-little, 0::float-32-little, 1, 2, 3>> + ) + + assert message =~ "Truncated RGBA" + + # flags: normal + assert {:error, %{message: message}} = + Binary.decode( + <<"EXCP", 1::little-16, 4::little-16, 1::little-64, 0::float-32-little, + 0::float-32-little, 0::float-32-little, 1, 2, 3>> + ) + + assert message =~ "Truncated normal" + end + end + + describe "gsplat SH list shapes" do + test "encodes flat SH lists and rejects truncated SH payloads" do + g = + struct(Gaussian, + position: {0.0, 0.0, 0.0}, + sh: [0.1, 0.2, 0.3, 0.4, 0.5, 0.6] + ) + + cloud = GaussianCloud.new([g]) + assert {:ok, bin} = Gsplat.encode(cloud) + assert {:ok, decoded} = Gsplat.decode(bin) + assert hd(decoded.gaussians).sh != nil + + # Valid header with one gaussian requiring SH floats that are missing. + header = <<"GSPL", 1::little-16, 0::little-16, 1::little-64, 3::little-16>> + base = :binary.copy(<<0::float-32-little>>, 14) + assert {:error, %{message: message}} = Gsplat.decode(header <> base <> <<1, 2>>) + assert message =~ "Truncated SH" + end + end + + describe "PLY typed encode/decode coverage" do + test "format aliases, property aliases, and mixed binary types" do + cloud = PointCloud.new([Point.new(1, 2, 3)]) + + assert {:ok, _} = PLY.encode(cloud, format: :binary_le) + assert {:ok, _} = PLY.encode(cloud, format: :little) + assert {:ok, _} = PLY.encode(cloud, format: :big) + assert {:ok, _} = PLY.encode(cloud, format: :unknown_defaults_ascii) + + assert {:error, %{reason: :invalid_data}} = PLY.decode(123) + + ascii = """ + ply + format ascii 1.0 + element vertex 1 + property float32 x + property float32 y + property float32 z + property int8 tiny + property uint8 utiny + property int16 s16 + property uint16 u16 + property int32 i32 + property uint32 u32 + property float64 d + end_header + 1 2 3 -1 2 -3 4 -5 6 7.5 + """ + + assert {:ok, decoded} = PLY.decode(ascii) + attrs = hd(decoded.points).attributes + assert attrs["tiny"] == -1 + assert attrs["utiny"] == 2 + assert attrs["d"] == 7.5 + + le_header = """ + ply + format binary_little_endian 1.0 + element vertex 1 + property double x + property double y + property double z + property char tiny + property ushort code + property short delta + property uint big + property int label + end_header + """ + + le_body = + <<1.0::little-float-64, 2.0::little-float-64, 3.0::little-float-64, -2::signed-8, + 9::little-unsigned-16, -4::little-signed-16, 11::little-unsigned-32, + 12::little-signed-32>> + + assert {:ok, le_cloud} = PLY.decode(le_header <> le_body) + assert hd(le_cloud.points).attributes["label"] == 12 + + be_header = """ + ply + format binary_big_endian 1.0 + element vertex 1 + property double x + property double y + property double z + property short delta + property uint big + property int label + end_header + """ + + be_body = + <<1.0::big-float-64, 2.0::big-float-64, 3.0::big-float-64, -4::big-signed-16, + 11::big-unsigned-32, 12::big-signed-32>> + + assert {:ok, be_cloud} = PLY.decode(be_header <> be_body) + assert hd(be_cloud.points).attributes["big"] == 11 + end + + test "encode rescue paths, header helpers, and stream sources" do + bad_point_cloud = + PointCloud.new([Point.new(0, 0, 0, attributes: %{"intensity" => :not_a_number})]) + + assert {:error, %{message: message}} = PLY.encode(bad_point_cloud, format: :binary) + assert message =~ "PLY encode failed" + + bad_gaussian = + %GaussianCloud{ + gaussians: [ + struct(Gaussian, position: {0.0, 0.0, 0.0}, sh: :not_a_list) + ] + } + + assert {:error, %{message: message}} = PLY.encode(bad_gaussian) + assert message =~ "PLY encode failed" + + assert {:ok, _parsed, _body} = + PLY.decode_header_and_body(""" + ply + format ascii 1.0 + element vertex 0 + end_header + """) + + path = + Path.join(System.tmp_dir!(), "ex_codecs_ply_cov_#{System.unique_integer([:positive])}.ply") + + on_exit(fn -> File.rm(path) end) + {:ok, bin} = PLY.encode(PointCloud.new([Point.new(0, 0, 1)])) + File.write!(path, bin) + + assert [%Point{}] = PLY.stream_decode(path, source: :file) |> Enum.to_list() + assert [%Point{}] = PLY.stream_decode(bin, source: :binary) |> Enum.to_list() + + assert [{:error, %{reason: :io_error}}] = + PLY.stream_decode("/no/such/ply_cov.ply", source: :file) |> Enum.to_list() + + # Corrupt file contents through the file stream path. + File.write!(path, "not-ply") + + assert [{:error, %{reason: :invalid_data}}] = + PLY.stream_decode(path, source: :file) |> Enum.to_list() + end + + test "gaussian stream decode and sparse attributes" do + gcloud = GaussianCloud.new([Gaussian.new({0.0, 1.0, 2.0})]) + {:ok, gbin} = PLY.encode(gcloud, format: :ascii) + assert [%Gaussian{}] = PLY.stream_decode(gbin) |> Enum.to_list() + + cloud = + GaussianCloud.new([ + struct(Gaussian, position: {0.0, 1.0, 2.0}, sh: nil), + struct(Gaussian, position: {1.0, 1.0, 1.0}, sh: []) + ]) + + assert {:ok, bin} = PLY.encode(cloud, format: :ascii) + assert {:ok, _} = PLY.decode(bin, as: :gaussian_cloud) + + assert {:ok, gspl} = + Gsplat.encode( + GaussianCloud.new([struct(Gaussian, position: {0.0, 0.0, 0.0}, sh: [])]) + ) + + assert {:ok, _} = Gsplat.decode(gspl) + + sparse = + PointCloud.new([ + Point.new(0, 0, 0, attributes: %{"intensity" => 1.0}), + Point.new(1, 1, 1) + ]) + + assert {:ok, _} = PLY.encode(sparse, format: :ascii) + + assert {:ok, weird_cloud} = + PLY.decode(""" + ply + format ascii 1.0 + element vertex 1 + property float x + property float y + property float z + property float weird + end_header + 1 2 3 not-a-number + """) + + assert hd(weird_cloud.points).attributes["weird"] == 0.0 + + assert {:ok, _} = + PLY.decode("ply\nformat ascii 1.0\nelement vertex 0\nend_header") + + assert {:error, _} = + PLY.decode(""" + ply + format ascii 1.0 + element vertex 1 + property float x + property float y + property float z + property notatype name + end_header + 1 2 3 4 + """) + + assert {:error, _} = + PLY.decode(""" + ply + format ascii 1.0 + element vertex nope + property float x + property float y + property float z + end_header + """) + + assert {:error, _} = + PLY.decode(""" + ply + format ascii 1.0 + element vertex -1 + property float x + property float y + property float z + end_header + """) + + # Extra tokens on the element vertex line. + assert {:error, %{message: "Malformed element vertex line in PLY"}} = + PLY.decode(""" + ply + format ascii 1.0 + element vertex 1 extra + property float x + end_header + 1 + """) + + # Property line missing its name. + assert {:error, %{message: "Invalid PLY property"}} = + PLY.decode(""" + ply + format ascii 1.0 + element vertex 1 + property float + end_header + 1 + """) + + path = + Path.join(System.tmp_dir!(), "ex_codecs_auto_#{System.unique_integer([:positive])}.excp") + + on_exit(fn -> File.rm(path) end) + {:ok, excp} = Spatial.encode(PointCloud.new([Point.new(1, 2, 3)]), format: :spatial_binary) + File.write!(path, excp) + + assert [%Point{}] = + Spatial.stream_decode(path, format: :spatial_binary) |> Enum.to_list() + end + end +end diff --git a/test/ex_codecs/nif_test.exs b/test/ex_codecs/nif_test.exs index b20fa31..023daa3 100644 --- a/test/ex_codecs/nif_test.exs +++ b/test/ex_codecs/nif_test.exs @@ -18,6 +18,11 @@ defmodule ExCodecs.NIFTest do NIF.wrap(:lz4, {:error, :decompression_failed}) end + test "wraps output_limit_exceeded error" do + assert {:error, %ExCodecs.Error{reason: :output_limit_exceeded, codec: :zstd}} = + NIF.wrap(:zstd, {:error, :output_limit_exceeded}) + end + test "wraps invalid_data error" do assert {:error, %ExCodecs.Error{reason: :invalid_data, codec: :blosc2}} = NIF.wrap(:blosc2, {:error, :invalid_data}) diff --git a/test/ex_codecs/spatial/point_test.exs b/test/ex_codecs/spatial/point_test.exs index 671524b..5f5886b 100644 --- a/test/ex_codecs/spatial/point_test.exs +++ b/test/ex_codecs/spatial/point_test.exs @@ -18,4 +18,9 @@ defmodule ExCodecs.Spatial.PointTest do assert Point.has_normal?(p) assert p.attributes["intensity"] == 0.5 end + + test "normalizes atom attribute keys to strings" do + p = Point.new(0, 0, 0, attributes: %{:intensity => 0.25, "label" => "a"}) + assert p.attributes == %{"intensity" => 0.25, "label" => "a"} + end end diff --git a/test/ex_codecs/spatial_test.exs b/test/ex_codecs/spatial_test.exs index 42a182a..a0dba03 100644 --- a/test/ex_codecs/spatial_test.exs +++ b/test/ex_codecs/spatial_test.exs @@ -4,13 +4,70 @@ defmodule ExCodecs.SpatialTest do alias ExCodecs.Spatial alias ExCodecs.Spatial.{Gaussian, GaussianCloud, Point, PointCloud} + defmodule CatalogSpatialCodec do + def encode(%PointCloud{}, []), do: {:ok, "catalog-spatial"} + def decode("catalog-spatial", []), do: {:ok, PointCloud.new([])} + end + describe "available_formats/0" do test "lists supported formats" do + assert Spatial.available_formats() == [:ply, :spatial_binary, :gsplat] assert :ply in Spatial.available_formats() assert :gsplat in Spatial.available_formats() assert Spatial.supports?(:ply) refute Spatial.supports?(:sog) end + + test "spatial formats participate in the shared catalog" do + assert :ply in ExCodecs.available_codecs() + assert ExCodecs.available_codecs(:spatial) == [:gsplat, :ply, :spatial_binary] + assert ExCodecs.supports?(:ply) + + assert {:ok, info} = ExCodecs.codec_info(:ply) + assert info.category == :spatial + assert info.interface == :spatial + end + + test "registered spatial extensions are discovered and dispatched" do + format = :"spatial_test_#{System.unique_integer([:positive])}" + + on_exit(fn -> + ExCodecs.CodecRegistry.unregister(format) + end) + + assert :ok = + ExCodecs.CodecRegistry.register( + format, + CatalogSpatialCodec, + :spatial, + :spatial + ) + + assert format in Spatial.available_formats() + assert Spatial.supports?(format) + + assert {:ok, "catalog-spatial"} = + Spatial.encode(PointCloud.new([]), format: format) + + assert {:ok, %PointCloud{points: []}} = + Spatial.decode("catalog-spatial", format: format) + end + + test "an unavailable spatial catalog entry returns codec_unavailable" do + format = :"unavailable_spatial_test_#{System.unique_integer([:positive])}" + + on_exit(fn -> + ExCodecs.CodecRegistry.unregister(format) + end) + + assert :ok = + ExCodecs.CodecRegistry.register_unavailable(format, :spatial, :spatial) + + refute Spatial.supports?(format) + + assert {:error, %ExCodecs.Error{reason: :codec_unavailable, codec: ^format}} = + Spatial.decode("payload", format: format) + end end describe "encode/decode" do @@ -34,6 +91,12 @@ defmodule ExCodecs.SpatialTest do assert {:ok, decoded} = Spatial.decode(bin, format: :ply) assert hd(decoded.points).color == {9, 8, 7} + + assert {:error, %ExCodecs.Error{reason: :invalid_options}} = + ExCodecs.encode(:ply, bin) + + assert {:error, %ExCodecs.Error{reason: :invalid_options}} = + ExCodecs.decode(:ply, bin) end test "stream decode and encode" do From 968f56920ffea3066688f0f311aa5cf0a1bf4fb9 Mon Sep 17 00:00:00 2001 From: thanos Date: Thu, 16 Jul 2026 18:20:52 -0400 Subject: [PATCH 3/6] multiple fixes --- lib/ex_codecs/native.ex | 10 ++++------ lib/ex_codecs/spatial/codec/binary.ex | 2 +- lib/ex_codecs/spatial/stream.ex | 2 +- test/ex_codecs/spatial/codec/binary_test.exs | 2 +- test/ex_codecs/spatial/codec/gsplat_test.exs | 2 +- test/ex_codecs/spatial/codec/ply_extra_test.exs | 2 +- test/ex_codecs/spatial/codec/ply_test.exs | 2 +- test/ex_codecs/spatial/coverage_test.exs | 6 +++--- 8 files changed, 13 insertions(+), 15 deletions(-) diff --git a/lib/ex_codecs/native.ex b/lib/ex_codecs/native.ex index 1df00c5..39bbb06 100644 --- a/lib/ex_codecs/native.ex +++ b/lib/ex_codecs/native.ex @@ -95,12 +95,10 @@ defmodule ExCodecs.Native do """ @spec nif_loaded?() :: boolean() def nif_loaded? do - try do - is_map(codec_versions()) - rescue - ErlangError -> false - ArgumentError -> false - end + is_map(codec_versions()) + rescue + ErlangError -> false + ArgumentError -> false end end diff --git a/lib/ex_codecs/spatial/codec/binary.ex b/lib/ex_codecs/spatial/codec/binary.ex index 786ddff..5fabef6 100644 --- a/lib/ex_codecs/spatial/codec/binary.ex +++ b/lib/ex_codecs/spatial/codec/binary.ex @@ -17,7 +17,7 @@ defmodule ExCodecs.Spatial.Codec.Binary do """ alias ExCodecs.Error - alias ExCodecs.Spatial.{Point, PointCloud, Metadata} + alias ExCodecs.Spatial.{Metadata, Point, PointCloud} @magic "EXCP" @version 1 diff --git a/lib/ex_codecs/spatial/stream.ex b/lib/ex_codecs/spatial/stream.ex index af8d054..ac35dec 100644 --- a/lib/ex_codecs/spatial/stream.ex +++ b/lib/ex_codecs/spatial/stream.ex @@ -16,8 +16,8 @@ defmodule ExCodecs.Spatial.Stream do """ alias ExCodecs.Error - alias ExCodecs.Spatial.{Gaussian, GaussianCloud, Point, PointCloud} alias ExCodecs.Spatial.Codec.{Binary, Gsplat, PLY} + alias ExCodecs.Spatial.{Gaussian, GaussianCloud, Point, PointCloud} @doc """ Returns an enumerable over points or Gaussians decoded from a path or binary. diff --git a/test/ex_codecs/spatial/codec/binary_test.exs b/test/ex_codecs/spatial/codec/binary_test.exs index ba8fd96..aa9788c 100644 --- a/test/ex_codecs/spatial/codec/binary_test.exs +++ b/test/ex_codecs/spatial/codec/binary_test.exs @@ -1,8 +1,8 @@ defmodule ExCodecs.Spatial.Codec.BinaryTest do use ExUnit.Case, async: true - alias ExCodecs.Spatial.{Point, PointCloud} alias ExCodecs.Spatial.Codec.Binary + alias ExCodecs.Spatial.{Point, PointCloud} test "round-trips colored points with normals" do cloud = diff --git a/test/ex_codecs/spatial/codec/gsplat_test.exs b/test/ex_codecs/spatial/codec/gsplat_test.exs index 3b5ed69..15e38d9 100644 --- a/test/ex_codecs/spatial/codec/gsplat_test.exs +++ b/test/ex_codecs/spatial/codec/gsplat_test.exs @@ -1,8 +1,8 @@ defmodule ExCodecs.Spatial.Codec.GsplatTest do use ExUnit.Case, async: true - alias ExCodecs.Spatial.{Gaussian, GaussianCloud} alias ExCodecs.Spatial.Codec.Gsplat + alias ExCodecs.Spatial.{Gaussian, GaussianCloud} test "round-trips Gaussians" do cloud = diff --git a/test/ex_codecs/spatial/codec/ply_extra_test.exs b/test/ex_codecs/spatial/codec/ply_extra_test.exs index c9a7b8a..ec6c119 100644 --- a/test/ex_codecs/spatial/codec/ply_extra_test.exs +++ b/test/ex_codecs/spatial/codec/ply_extra_test.exs @@ -1,8 +1,8 @@ defmodule ExCodecs.Spatial.Codec.PLYExtraTest do use ExUnit.Case, async: true - alias ExCodecs.Spatial.{Gaussian, GaussianCloud, Point, PointCloud} alias ExCodecs.Spatial.Codec.PLY + alias ExCodecs.Spatial.{Gaussian, GaussianCloud, Point, PointCloud} test "binary big-endian round-trip" do cloud = PointCloud.new([Point.new(1.5, 2.5, 3.5, color: {9, 8, 7})]) diff --git a/test/ex_codecs/spatial/codec/ply_test.exs b/test/ex_codecs/spatial/codec/ply_test.exs index 40ad477..88c2b30 100644 --- a/test/ex_codecs/spatial/codec/ply_test.exs +++ b/test/ex_codecs/spatial/codec/ply_test.exs @@ -1,8 +1,8 @@ defmodule ExCodecs.Spatial.Codec.PLYTest do use ExUnit.Case, async: true - alias ExCodecs.Spatial.{Gaussian, GaussianCloud, Point, PointCloud} alias ExCodecs.Spatial.Codec.PLY + alias ExCodecs.Spatial.{Gaussian, GaussianCloud, Point, PointCloud} describe "point cloud ASCII PLY" do test "round-trips XYZRGB" do diff --git a/test/ex_codecs/spatial/coverage_test.exs b/test/ex_codecs/spatial/coverage_test.exs index 82dfbbd..086d643 100644 --- a/test/ex_codecs/spatial/coverage_test.exs +++ b/test/ex_codecs/spatial/coverage_test.exs @@ -2,7 +2,7 @@ defmodule ExCodecs.Spatial.CoverageTest do use ExUnit.Case, async: true alias ExCodecs.Spatial - alias ExCodecs.Spatial.{Gaussian, GaussianCloud, Point, PointCloud} + alias ExCodecs.Spatial.{Bounds, Gaussian, GaussianCloud, Metadata, Point, PointCloud} alias ExCodecs.Spatial.Codec.{Binary, Gsplat, PLY} alias ExCodecs.Spatial.Stream, as: SpatialStream @@ -200,12 +200,12 @@ defmodule ExCodecs.Spatial.CoverageTest do describe "point cloud remaining branches" do test "explicit bounds and mixed color detection" do - bounds = ExCodecs.Spatial.Bounds.new({0, 0, 0}, {1, 1, 1}) + bounds = Bounds.new({0, 0, 0}, {1, 1, 1}) cloud = PointCloud.new([Point.new(0, 0, 0, color: {1, 2, 3}), Point.new(1, 1, 1)], bounds: bounds, - metadata: ExCodecs.Spatial.Metadata.new(comments: ["x"]) + metadata: Metadata.new(comments: ["x"]) ) assert cloud.bounds == bounds From 491f0afc4b07f36510e1abbbf666dc85a1c7a5d3 Mon Sep 17 00:00:00 2001 From: thanos Date: Thu, 16 Jul 2026 18:24:57 -0400 Subject: [PATCH 4/6] bumped thetoolchain to 1.91 --- .github/workflows/ci.yml | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 66f5d3b..0d73dbb 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -11,7 +11,9 @@ concurrency: cancel-in-progress: true env: - RUST_VERSION: "1.85" + # Must satisfy native/ex_codecs_native/Cargo.toml `rust-version` + # (structured-zstd 0.0.48 requires rustc >= 1.92). + RUST_VERSION: "1.92" jobs: test: From b5d185d90d7e238d67f72c65d827840722db5ce7 Mon Sep 17 00:00:00 2001 From: thanos Date: Thu, 16 Jul 2026 19:06:18 -0400 Subject: [PATCH 5/6] =?UTF-8?q?Fixed=20=E2=80=94=20the=20CI=20toolchain=20?= =?UTF-8?q?needs=20to=20be=201.94,=20not=201.92,=20because=20structured-zs?= =?UTF-8?q?td's=20declared=20minimum=20Rust=20version=20is=20actually=20wr?= =?UTF-8?q?ong.?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Root cause: structured-zstd calls __cpuid without an unsafe block in its x86_64 BMI2 runtime-detection path (bit_reader_reverse.rs) — I confirmed the same code is present in the latest 0.0.49, so upgrading the crate wouldn't help. __cpuid was only recently changed from an unsafe fn to a safe function in the standard library (rust-lang/stdarch#1935), and that change shipped in rustc 1.94. On rustc 1.92 — which CI now installs after the previous fix, matching the crate's advertised MSRV — __cpuid is still unsafe, so the compiler rejects the call with E0133. In other words, the crate's rust-version = "1.92" metadata understates its real requirement of 1.94. It builds fine on your Mac because the whole code path is gated to target_arch = "x86_64" and never compiles on Apple Silicon. Changes: .github/workflows/ci.yml — bumped RUST_VERSION from "1.92" to "1.94", with a comment explaining the crate's incorrect MSRV metadata. native/ex_codecs_native/Cargo.toml — bumped rust-version to "1.94" so the failure mode on an old toolchain is a clear "rustc X is not supported" message instead of a confusing E0133. README.md — updated the two "Rust 1.92+" mentions to 1.94+. cargo check passes locally (rustc 1.95.0). release.yml is unaffected since it uses latest stable. Push and CI should compile the NIF on the x86_64 runners now. --- .github/workflows/ci.yml | 7 ++++--- README.md | 4 ++-- native/ex_codecs_native/Cargo.toml | 4 +++- 3 files changed, 9 insertions(+), 6 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 0d73dbb..e5938f7 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -11,9 +11,10 @@ concurrency: cancel-in-progress: true env: - # Must satisfy native/ex_codecs_native/Cargo.toml `rust-version` - # (structured-zstd 0.0.48 requires rustc >= 1.92). - RUST_VERSION: "1.92" + # Must satisfy native/ex_codecs_native/Cargo.toml `rust-version`. + # structured-zstd calls the now-safe __cpuid without an unsafe block on + # x86_64, which needs rustc >= 1.94 (its own 1.92 MSRV metadata is wrong). + RUST_VERSION: "1.94" jobs: test: diff --git a/README.md b/README.md index bc6c1aa..cab55bd 100644 --- a/README.md +++ b/README.md @@ -58,7 +58,7 @@ Precompiled NIF binaries are available for macOS (Intel and ARM64), Linux automatically from the [GitHub releases](https://github.com/thanos/codecs/releases) when you run `mix deps.get`. If a precompiled artifact is not available for your target, ExCodecs falls back to compiling the Rust NIF from source (requires -Rust 1.92+). The native crate is **pure Rust** (no C toolchain / system +Rust 1.94+). The native crate is **pure Rust** (no C toolchain / system compression libraries). ## Quick Start @@ -280,7 +280,7 @@ mix docs - Elixir 1.17+ - Erlang/OTP 26+ -- Rust 1.92+ (only required if precompiled NIFs are unavailable for your platform) +- Rust 1.94+ (only required if precompiled NIFs are unavailable for your platform) ## License diff --git a/native/ex_codecs_native/Cargo.toml b/native/ex_codecs_native/Cargo.toml index b593f37..48a44f1 100644 --- a/native/ex_codecs_native/Cargo.toml +++ b/native/ex_codecs_native/Cargo.toml @@ -3,7 +3,9 @@ name = "ex_codecs_native" version = "0.2.0" authors = ["ExCodecs Team"] edition = "2021" -rust-version = "1.92" +# structured-zstd declares MSRV 1.92 but calls the now-safe __cpuid without +# an unsafe block on x86_64, which requires rustc >= 1.94 (E0133 on older). +rust-version = "1.94" [lib] name = "ex_codecs_native" From b95ce37b6ff3d5535bb1b6daf90c29ce8c77b977 Mon Sep 17 00:00:00 2001 From: thanos Date: Thu, 16 Jul 2026 19:33:34 -0400 Subject: [PATCH 6/6] added an explicit child_spec/1 override in ExCodecs.CodecRegistry, marked @doc false: codec_registry.ex Lines 19-33 use Agent @table_name :ex_codecs_registry @registry_name __MODULE__ @doc false def child_spec(arg) do %{ id: __MODULE__, start: {__MODULE__, :start_link, [arg]} } end Because @doc false makes Code.fetch_docs/1 return :hidden (not a map), the test's is_map(doc) filter skips it. The returned spec is byte-for-byte what use Agent would have generated, so {ExCodecs.CodecRegistry, register: ...} in application.ex continues to start the registry exactly as before --- lib/ex_codecs/codec_registry.ex | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/lib/ex_codecs/codec_registry.ex b/lib/ex_codecs/codec_registry.ex index 82de59b..cfd6b0a 100644 --- a/lib/ex_codecs/codec_registry.ex +++ b/lib/ex_codecs/codec_registry.ex @@ -21,6 +21,17 @@ defmodule ExCodecs.CodecRegistry do @table_name :ex_codecs_registry @registry_name __MODULE__ + # Explicit override of the `use Agent`-generated child_spec/1 so it is + # excluded from the public-doc surface checked by DocumentationTest. The + # returned spec is identical to the generated default. + @doc false + def child_spec(arg) do + %{ + id: __MODULE__, + start: {__MODULE__, :start_link, [arg]} + } + end + @doc """ Starts the registry Agent and optional re-registration callback.