View source for ZIP

'''ZIP''' is an archive file format with optional lossless compression. It is used in {{src|4.1}} for the [[BSP (Source)#Pakfile|pakfile lump in BSP files]], as well as for bonus map [[BMZ]] files. It is also most likely used to store game data for the {{360|4}} (or other consoles) version of {{source|4}} games{{Cite|1}}. The ZIP file format supports several different compression format, although Source only supports uncompressed and, in some engine branches, {{wiki|LZMA}}.

{{warning|Only certain engine branches and BSP versions support compressed pakfiles; {{src13mp}} and {{jbep3}} do, but {{src13sp}} and {{Csgobranch}} do not!}}

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Additionally, the ZIP file format is used for the '''PK3''' and '''PK4''' files used by {{quake3|4.1|nt=3}} and {{idtech4|4.1}}, respectively, which use the standard {{wiki|Deflate}} compression instead.

== Structs ==
{{todo|See [https://github.com/ValveSoftware/source-sdk-2013/blob/master/mp/src/public/zip_uncompressed.h Source 2013 Multiplayer] and [https://github.com/ValveSoftware/source-sdk-2013/blob/master/sp/src/public/zip_uncompressed.h Source 2013 Singleplayer] versions of {{file|zip_uncompressed|h}}, containing the [[struct]]s used by Source to load ZIP files }}
Unlike most file formats, a ZIP file's header is near the ''end'' of the file, meaning that if, for example, a ZIP file is concatenated to the end of a [[PAK]] file, the resulting file will be both a valid PAK file and a valid ZIP file.

== See also ==
* [[PAK]], uncompressed archive format used by {{idtech2|4}} and {{gldsrc|4}}
* [[VPK (file format)|VPK]], uncompressed archive format used by {{src|4}} and {{src2|4}}
* [[GCF archive|GCF]], uncompressed archive format formerly used by {{steamicon|4}}, prior to the SteamPipe update.
* [[BZ2]], single-file compression format used by [[FastDL]] servers {{src|only}}

== External links ==
* {{wiki|ZIP (file format)}} on Wikipedia

{{references|1=
{{ref2|cite id=1|[[User:kr0tchet]] - Currently I only seen that from the {{p3|4}} leaked {{x360|4}} build (the zip file was named as {{file|zip0.360|zip}}), and can be only opened by using 7-Zip (WinRAR cause an error about unexpected end of archive), not sure if console's {{tob|4}} also store some it's game files to ZIP aswell.}}
}}

[[Category:files]]
[[Category:file formats]]