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

• Type: New Feature
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.0
• Fix Version/s: 1.7
• Component/s: Archivers
• Labels: zip
• Assignee: Emmanuel Bourg
• Reporter: Emmanuel Bourg
• Created: 09/Jun/10 23:05
• Updated: 19/Dec/13 16:10
• Resolved: 19/Dec/13 16:10

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

Issue Links

• is blocked by: COMPRESS-93 Support for alternative ZIP compression methods