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  • Bijective BWT (7 Comments)

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

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Winzip releases PPMd compression specification for winzip 10.0

Posted by Sachin Garg on 2nd November 2005 | Permanent Link

You probably already know about the recent changes that came with winzip 10.0 beta.

Among other things, they announced support for bzip2 and ppmd algorithms in zip files. Although bzip2 format is already very popular and well specified, there were confusions regarding the format used for Dmitry Shkarin’s PPMd algorithm.

They have finally released the details, with all the due credits given to Dmitry Shkarin.

They have also introduced a developer-update mailing-list which probably means that more developments are underway. Seems like they have decided to assume ownership of ZIP format and, after years of just UI updates, speed up on path of “developing” the format further.

This sure is good news for users (as long as they take care that backward-incompatibility doesnt becomes too much pain to handle, which is gonna be a lot harder than it sounds).

2 Responses to “Winzip releases PPMd compression specification for winzip 10.0”

  1. PPMII Updated, ppmdj Says:
    February 16th, 2006 at 1:02 pm

    [...] Dmitry Shkarin announced ppmdj, the next revision of ppmdi1. Dmitry Shkarin’s PPMII is the fastest known PPM implementation. Its last revision, ppmdi1 was recently included as an additional algorithm in ZIP format (by WinZip makers). [...]

  2. WinZip: Bug found in version 10.0, New features (and more backward incompatibility, and a controversy) in 11.0 - The Data Compression News Blog - c10n.info Says:
    November 23rd, 2006 at 5:11 pm

    [...] And how this (and other moves by WinZip and PKWare) break backward compatibility of now 18+ years old ZIP format and can cause headaches for the users unable to figure why their friends can’t extract the files they sent is a discussion better left for another day. Without the only unique advantage ZIP has compared to other formats (ubiquitous support and guarantee that user will be able to extract the file) it will be interesting to see how fast users switch to something inherently better. [...]

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This entry was posted on Wednesday, November 2nd, 2005 at 11:20 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.