[jira] Updated: (COMPRESS-115) Imploded entry decompression for Zip archives (method 6)

["Emmanuel Bourg (JIRA)" <ji...@apache.org>]

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

Emmanuel Bourg updated COMPRESS-115:
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    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

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