Commons Compress
  1. Commons Compress
  2. COMPRESS-115

Imploded entry decompression for Zip archives (method 6)

    Details

    • Type: New Feature New Feature
    • Status: Resolved
    • Priority: Major Major
    • Resolution: Fixed
    • Affects Version/s: 1.0
    • Fix Version/s: 1.7
    • Component/s: Archivers
    • Labels:

      Description

      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

      1. explode.c
        24 kB
        Emmanuel Bourg
      2. imploding-4Kdict-2trees.zip
        0.7 kB
        Emmanuel Bourg
      3. imploding-8Kdict-3trees.zip
        4 kB
        Emmanuel Bourg

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            • Assignee:
              Emmanuel Bourg
              Reporter:
              Emmanuel Bourg
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              • Created:
                Updated:
                Resolved:

                Development