search

klauspost / compress

Optimized Go Compression Packages
Other
4.77k stars 319 forks source link

zip: support different compression types #965

Closed vapier closed 5 months ago

vapier commented 5 months ago

the zip module ATM only supports deflate compression. can other compression algorithms be added here ? zstd seems like the most desirable.

https://github.com/klauspost/compress/blob/master/zip/struct.go

// Compression methods.
const (
    Store   uint16 = 0 // no compression
    Deflate uint16 = 8 // DEFLATE compressed
)

https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT

   4.4.5 compression method: (2 bytes)

        0 - The file is stored (no compression)
        1 - The file is Shrunk
        2 - The file is Reduced with compression factor 1
        3 - The file is Reduced with compression factor 2
        4 - The file is Reduced with compression factor 3
        5 - The file is Reduced with compression factor 4
        6 - The file is Imploded
        7 - Reserved for Tokenizing compression algorithm
        8 - The file is Deflated
        9 - Enhanced Deflating using Deflate64(tm)
       10 - PKWARE Data Compression Library Imploding (old IBM TERSE)
       11 - Reserved by PKWARE
       12 - File is compressed using BZIP2 algorithm
       13 - Reserved by PKWARE
       14 - LZMA
       15 - Reserved by PKWARE
       16 - IBM z/OS CMPSC Compression
       17 - Reserved by PKWARE
       18 - File is compressed using IBM TERSE (new)
       19 - IBM LZ77 z Architecture 
       20 - deprecated (use method 93 for zstd)
       93 - Zstandard (zstd) Compression 
       94 - MP3 Compression 
       95 - XZ Compression 
       96 - JPEG variant
       97 - WavPack compressed data
       98 - PPMd version I, Rev 1
       99 - AE-x encryption marker (see APPENDIX E)