commons-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Emmanuel Bourg (JIRA)" <j...@apache.org>
Subject [jira] Updated: (COMPRESS-115) Imploded entry decompression for Zip archives (method 6)
Date Wed, 09 Jun 2010 23:11:13 GMT

     [ https://issues.apache.org/jira/browse/COMPRESS-115?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Emmanuel Bourg updated COMPRESS-115:
------------------------------------

    Attachment: imploding-4Kdict-2trees.zip
                imploding-8Kdict-3trees.zip

Here are 2 test files covering the variants of the imploded format (4K or 8K sliding dictionary,
2 or 3 Shannon-Fano trees)

> Imploded entry decompression for Zip archives (method 6)
> --------------------------------------------------------
>
>                 Key: COMPRESS-115
>                 URL: https://issues.apache.org/jira/browse/COMPRESS-115
>             Project: Commons Compress
>          Issue Type: New Feature
>    Affects Versions: 1.0
>            Reporter: Emmanuel Bourg
>         Attachments: imploding-4Kdict-2trees.zip, imploding-8Kdict-3trees.zip
>
>
> This is a RFE to implement the decompression of zip file entries using the imploded compression
method (aka method 6). This method is found in archives created with old versions of PKZip.
Only the decompression operation is really useful since this method is less efficient than
deflate.
> Some links with technical information about this format:
> http://www.pkware.com/documents/casestudies/APPNOTE.TXT
> http://en.wikipedia.org/wiki/Shannon%E2%80%93Fano_coding
> http://en.wikipedia.org/wiki/LZ77
> http://src.opensolaris.org/source/xref/sfw/usr/src/cmd/unzip/explode.c

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message