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  • Bijective BWT (7 Comments)

    David Scott has written a bijective BWT transform, which brings all the advantages of bijectiveness to BWT based compressors. Among other things, making BWT more suitable for compression-before-encryption and also give (slightly) better compression.

  • Asymmetric Binary System (116 Comments)

    Jarek Duda’s “Asymmetric Binary System” promises to be an alternate to arithmetic coding, having all the advantages, but being much simpler. Matt has coded a PAQ based compressor using ABS for back-end encoding. Update: Andrew Polar has written an alternate implementation of ABS.

  • Precomp: More Compression for your Compressed Files (3 Comments)

    So many of today’s files are already compressed (using old, outdated algorithms) that newer algorithms don’t even get a chance to touch them. Christian Schneider’s Precomp comes to rescue by undoing the harm.

  • On2 Technologies is Hiring

    There aren’t too many companies working on cutting edge codecs, and of those few this one is hiring. Best of luck.

  • China’s AVS Specifications Available (2 Comments)

    Its old news that China has developed their own Advanced Video Standard to avoid high licensing fees. English translation of the standard is now available, along with the IPR policy. Finally something technical that you can get your hands on to feed your appetite.

ZPack File Format, spec and tools

Posted by Sachin Garg on 10th May 2006 | Permanent Link

Today at comp.compression, Brendan G Bohannon announced a vaguely PAQ like file format supporting compression and read/write operation (as zipfiles are not that well suited to read/write). The format will assume no fragmentation of smaller files, rather a file is to be moved if it expands beyond the space available to it.

Current default file extension will be “zpk” and will use deflate with a 64kB window. The CRC algo will be the same algo used in ZIP and PNG for example.

You can checkout the code and format specs.

Another related comp.compression thread.

2 Responses to “ZPack File Format, spec and tools”

  1. manescumihai Says:
    May 26th, 2007 at 1:03 am

    i have one file .zpk and i kent open hellp me plese !

  2. Sachin Garg Says:
    May 26th, 2007 at 1:53 am

    Where did ou get this file from? How did you create it?

    Can you tell what are the first few bytes of the file? it might or might not be a zpack file.

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