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  • Bijective BWT (2 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 (107 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

    So many of today’s files are already compressed (using old, outdated algorithms) that newer algorithms don’t even get a chance to touch them.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.

PIGZ: Parallel GZIP

Posted by Sachin Garg on 13th April 2007 | Permanent Link

Mark Adler, maintainer of popular zlib library has released a multicore capable Parallel Implementation of GZip, nicknamed PIGZ. Version 1.5 implements nearly all of gzip’s functionality, including decompression of .gz and .Z (Unix compress) files.

You can get the latest code, it needs latest version of zlib (1.2.3) to build.

5 Responses to “PIGZ: Parallel GZIP”

  1. Mark Adler Says:
    April 13th, 2007 at 11:24 pm

    That link won’t work. The latest distributed version is 1.6, and the link is http://zlib.net/pigz16.c.gz.

    It will also optionally compress to the zlib format.

  2. Sachin Garg Says:
    April 30th, 2007 at 11:33 am

    Mark has released another update, version 1.7 decompresses the first entry of a zip file (if deflated), and compresses to a single-entry zip file if requested with –zip.

    http://zlib.net/pigz17.c.gz

  3. Kristiyan Georgiev Says:
    March 25th, 2008 at 1:18 pm

    http://zlib.net/pigz16.c.gz is broken, can you point me to a different location?

    Cheers,
    kris

  4. Sachin Garg Says:
    March 25th, 2008 at 6:40 pm

    Just use the link to version 1.7, its in the comment above yours.

  5. Andrew Polar Says:
    March 26th, 2008 at 2:01 pm

    I wish to use this opportunity and ask Mark Adler a question. In 1990 Martucci published article regarding usage of simple predictor in combination with entropy encoder for compression of images. Following this article it is possible to write image compression routine of 300 lines that makes photo images to be compressed as 2.5 to 1. Three years later PNG format was created that required 20 times longer code and compressed photo images typically as 1.7 to 1. PNG format happened to be incorporated into major browsers. 16 years after mentioned publication Microsoft introduced HD Photo that compress images to the same ratio as in Marucci method published in 1990. And few years ago JPEG2000 anounced format that is about 7% better than Martucci suggested in 1990. The question is
    Wouldn’t that be nice to incorporate new format into all browsers that require 300 lines of coding, so programmers will be able to generate images on the fly in web applications without using so called new approach of Microsoft that is called Silverlight.
    Thanks,
    Andrew Polar

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This entry was posted on Friday, April 13th, 2007 at 11:39 am by Sachin Garg. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.