gzip.uncompress() to original_file_name from gzip metadata #120

Activity

1. fengmk2 commented on Dec 3, 2025

   

   fengmk2

   on Dec 3, 2025

   Member

   More actions

   Can you provide a way to reproduce it?
2. Araxeus commented on Dec 4, 2025

   

   Araxeus

   on Dec 4, 2025

   Last edited by Araxeus

   Author

   More actions

   What I'm asking is for something akin to gzip --decompress--name \ -N, or in other words to be able to supply compressing.gzip.uncompress() with a directory name like compressing.zip.uncompress()
   Here's an example:
   bash:

   echo "console.log('hi')" > script.js
   gzip script.js
   mv script.js.gz output.gz
   ls
   # output.gz
   gzip --decompress --keep --name output.gz
   ls
   # output.gz
   # script.js

   js:

   // [1] Cant uncompress into a dir unlike the gzip cli
   compressing.gzip.uncompress('output.gz', './result'); // node error "open EISDIR"
   // [2] Cant reliably uncompress into a file unless you know the file name inside the gzip
   compressing.gzip.uncompress('output.gz', './result/output'); // ok but you just lost the original filename and extension
   // [3] Can only reliably uncompress if you already know the filename inside the gzip
   compressing.gzip.uncompress('output.gz', './result/script.js'); // ok but i might not know the name and extension of the gzipped file

   Ideally compressing.gzip.uncompress() should be able to accept a dir path like in example [1] - and then automatically get the output file name from:

   1. (if FLG.FNAME set) original_file_name
   2. (If FLG.FNAME not set) archive_name.replace(/\.gz$/, "");
      (Might need a better idea for streams and buffers)

   Note:
   Gzip can (and does by default) store filename metadata. See section 2.3 Member Format in RFC 1952.
3. Araxeus

   changed the title [-]gzip uncompress file name[/-] [+]`gzip.uncompress()` to `original_file_name` from gzip metadata[/+] on Dec 4, 2025
4. fengmk2 commented on Dec 4, 2025

   

   fengmk2

   on Dec 4, 2025

   Member

   More actions

   I understand that we need to parse the hidden default filename inside the gzip file.

   This is a feature worth trying to implement.
   You are welcome to participate in open source contributions through pull requests.
5. fengmk2

   added the

   Feature

   issue type on Dec 4, 2025
6. fengmk2

   added

   help wanted

   on Dec 4, 2025