https://3dfxdev.net/edgewiki/index.php?action=history&feed=atom&title=ZIPZIP - Revision history2026-06-06T12:00:18ZRevision history for this page on the wikiMediaWiki 1.27.0https://3dfxdev.net/edgewiki/index.php?title=ZIP&diff=570&oldid=prevCorbin: created, based on ZDoom's Wiki Article "ZIP"2017-01-15T00:10:21Z<p>created, based on ZDoom's Wiki Article "ZIP"</p>
<p><b>New page</b></p><div>The '''ZIP''' file format is a standard container format developed by {{wp|PKWARE,_Inc|PKWARE}} and allowing a large number of compression methods. This is an open and widely used standard; however it is very seldom implemented fully.<br />
<br />
The standard defines the following compression methods (bolded methods are supported by 3DGE):<br />
'''0 - The file is stored (no compression)'''<br />
'''1 - The file is Shrunk'''<br />
2 - The file is Reduced with compression factor 1<br />
3 - The file is Reduced with compression factor 2<br />
4 - The file is Reduced with compression factor 3<br />
5 - The file is Reduced with compression factor 4<br />
'''6 - The file is Imploded'''<br />
'''8 - The file is Deflated'''<br />
9 - Enhanced Deflating using Deflate64(tm)<br />
10 - PKWARE Data Compression Library Imploding (old IBM TERSE)<br />
'''12 - File is compressed using BZIP2 algorithm'''<br />
'''14 - LZMA (EFS)'''<br />
18 - File is compressed using IBM TERSE (new)<br />
19 - IBM LZ77 z Architecture (PFS)<br />
97 - WavPack compressed data<br />
98 - PPMd version I, Rev 1 '''(as of {{latest}}, only PPMd version H is supported (.7z/.pk7, not .zip/.pk3))'''<br />
Each file in a ZIP archive can be compressed with a different method. In practice, ZIP implementation is generally limited to only formats 0 (stored) and 8 (deflated).<br />
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[[3DGE]] and [[zipdir]] both support methods 0 (stored), 1 (shrunk), 6 (imploded), 8 (deflated), 12 (bzipped 2) and 14 (LZMA, also used by the 7z format). As of 2009, when {{forum|t=22004|support for Shrunk and Implode was added}}, all the zip files on the [[Idgames archive]] can be opened successfully by 3DGE (unsupported methods are not used).<br />
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The implementation in 3DGE is supported via the use of Physics_FS, by Ryan C. Gordon.<br />
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==See also==<br />
* [[Using ZIPs as WAD replacement]]<br />
* [[Namespaces]]<br />
<br />
==External links==<br />
* {{wp|ZIP_(file_format)|ZIP}} at [[Wikipedia]]<br />
* [http://www.pkware.com/documents/casestudies/APPNOTE.TXT Official specifications]<br />
[[Category:Archive formats]]</div>Corbin