co_http/bytes_buffer.hpp at master · dashxio/co_http · GitHub

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#pragma once

#include <cstddef>
#include <string_view>
#include <stdexcept>
#include <vector>

struct bytes_const_view {
    char const *m_data;
    size_t m_size;

    char const *data() const noexcept {
        return m_data;
    }

    size_t size() const noexcept {
        return m_size;
    }

    char const *begin() const noexcept {
        return data();
    }

    char const *end() const noexcept {
        return data() + size();
    }

    bytes_const_view subspan(size_t start,
                             size_t len = static_cast<size_t>(-1)) const {
        if (start > size()) {
            throw std::out_of_range("bytes_const_view::subspan");
        }
        if (len > size() - start) {
            len = size() - start;
        }
        return {data() + start, len};
    }

    operator std::string_view() const noexcept {
        return std::string_view{data(), size()};
    }
};

struct bytes_view {
    char *m_data;
    size_t m_size;

    char *data() const noexcept {
        return m_data;
    }

    size_t size() const noexcept {
        return m_size;
    }

    char *begin() const noexcept {
        return data();
    }

    char *end() const noexcept {
        return data() + size();
    }

    bytes_view subspan(size_t start, size_t len) const {
        if (start > size()) {
            throw std::out_of_range("bytes_view::subspan");
        }
        if (len > size() - start) {
            len = size() - start;
        }
        return {data() + start, len};
    }

    operator bytes_const_view() const noexcept {
        return bytes_const_view{data(), size()};
    }

    operator std::string_view() const noexcept {
        return std::string_view{data(), size()};
    }
};

struct bytes_buffer {
    std::vector<char> m_data;

    bytes_buffer() = default;
    bytes_buffer(bytes_buffer &&) = default;
    bytes_buffer &operator=(bytes_buffer &&) = default;
    explicit bytes_buffer(bytes_buffer const &) = default;

    explicit bytes_buffer(size_t n) : m_data(n) {}

    char const *data() const noexcept {
        return m_data.data();
    }

    char *data() noexcept {
        return m_data.data();
    }

    size_t size() const noexcept {
        return m_data.size();
    }

    char const *begin() const noexcept {
        return data();
    }

    char *begin() noexcept {
        return data();
    }

    char const *end() const noexcept {
        return data() + size();
    }

    char *end() noexcept {
        return data() + size();
    }

    bytes_const_view subspan(size_t start, size_t len) const {
        return operator bytes_const_view().subspan(start, len);
    }

    bytes_view subspan(size_t start, size_t len) {
        return operator bytes_view().subspan(start, len);
    }

    operator bytes_const_view() const noexcept {
        return bytes_const_view{m_data.data(), m_data.size()};
    }

    operator bytes_view() noexcept {
        return bytes_view{m_data.data(), m_data.size()};
    }

    operator std::string_view() const noexcept {
        return std::string_view{m_data.data(), m_data.size()};
    }

    void append(bytes_const_view chunk) {
        m_data.insert(m_data.end(), chunk.begin(), chunk.end());
    }

    void append(std::string_view chunk) {
        m_data.insert(m_data.end(), chunk.begin(), chunk.end());
    }

    template <size_t N>
    void append_literial(char const (&literial)[N]) {
        append(std::string_view{literial, N - 1});
    }

    void clear() {
        m_data.clear();
    }

    void resize(size_t n) {
        m_data.resize(n);
    }

    void reserve(size_t n) {
        m_data.reserve(n);
    }
};

template <size_t N>
struct static_bytes_buffer {
    std::array<char, N> m_data;

    char const *data() const noexcept {
        return m_data.data();
    }

    char *data() noexcept {
        return m_data.data();
    }

    static constexpr size_t size() noexcept {
        return N;
    }

    operator bytes_const_view() const noexcept {
        return bytes_const_view{m_data.data(), N};
    }

    operator bytes_view() noexcept {
        return bytes_view{m_data.data(), N};
    }

    operator std::string_view() const noexcept {
        return std::string_view{m_data.data(), m_data.size()};
    }
};