View source for StuffIt

{{FormatInfo
|formattype=electronic
|subcat=Archiving
|extensions={{ext|sit}}
|mimetypes={{mimetype|application/x-stuffit}}, {{mimetype|application/x-sit}}
|pronom={{PRONOM|fmt/639}}, {{PRONOM|fmt/1459}}, {{PRONOM|fmt/1460}}
|wikidata={{wikidata|Q59535034}}
|type code={{Type Code|SIT!}}
|released=1987
}}
If somebody tells you '''StuffIt''', they might be brushing you off rudely, but, especially if they're a Mac user, they might just be recommending their favorite file archiver. Since the late 1980s, StuffIt has been the most popular file archiving system for the Mac platform, with a version available for Windows as well (though it never achieved a high degree of popularity there). Like a number of other Mac archivers, StuffIt supports storing the [[Resource Fork]] along with the "regular" file, which is one reason Mac-specific archivers were popular in preference to "generic" ones like [[ZIP]]. StuffIt also produced more compact archives than its main competitor [[PackIt]] at the time it was first released in 1987, when its author, Raymond Lau, was still in high school. It has faced other competitors since, but remained on top. In recent times, however, with OS X being [[Unix]]-based, traditional Unix archiving and compression programs such as [[Tape Archive|tar]] and [[gzip]] are getting increasing use on Macs.

The makers of StuffIt have also released the newer format [[StuffIt X]].

These formats remain proprietary, and do not interoperate with other programs unless they are officially licensed.

== History ==
StuffIt versions through 1.5.1 are credited to Raymond Lau. Following versions are by Aladdin Systems. Aladdin Systems was acquired by IMSI in 2004, and renamed to Allume Systems shortly afterward. In 2005, Allume Systems was acquired by Smith Micro.

== Compression methods ==
{| class="wikitable"
! ID !! Name !! Description
|-
|0 || None || Uncompressed
|-
|1 || RLE || [[RLE90]]
|-
|2 || LZW || [[LZW]], similar to [[compress (Unix)]]
|-
|3 || Huffman || Static [[Huffman coding]]
|-
|5 || LZAH || [[LZ77 with Huffman coding|LZ77+Huffman]] with [[Adaptive Huffman coding]]. Similar or identical to [[LHA]]'s "lh1" method.
|-
|6 || Fixed Huffman || Segmented. [[PackBits]], then optional [[Huffman coding]]. The set of Huffman codes is predefined, but the meaning of a code can be different in each segment.
|-
|8 || MW || "Miller-Wegman". Presumably [[LZMW]].
|-
|13 || LZ+Huffman ||
|-
|14 || Installer ||
|-
|15 || Arsenic ||
|}

== See also ==
* [[SEA (StuffIt)]]
* [[StuffIt X]]

== Identification ==
* Older StuffIt archives begin with ASCII "{{magic|SIT!}}", and have "{{magic|rLau}}" at offset 10. The byte at offset 14 (the version number) is 0x01 for versions 1.5.x and earlier, or 0x02 for versions 1.6 - 4.5.

* StuffIt 5 archives begin with a string of text that always starts with "{{magic|StuffIt&nbsp;(c)1997}}". The byte at offset 82 has value {{magic|0x05}}.

* See also [[StuffIt X#Identification]].

Some .SIT files start with a 128-byte [[MacBinary]] header.

== Software ==
* [http://www.stuffit.com Official site with downloads/purchases]
* [[The Unarchiver]] (based in part on XAD)
* [[macutil]] → macunpack
* [https://github.com/ParksProjets/Maconv Maconv] (based in part on The Unarchiver)
* {{XAD}} (mainly for Amiga)
* {{Deark}} (limited support)

== Format info ==
Original format:
* [http://apple2.org.za/gswv/a2zine/GS.WorldView/Resources/The.MacShrinkIt.Project/ARCHIVES.TXT Archive format info, including StuffIt]

V5 format:
* Comments and code in the [http://aminet.net/package/util/arc/xadmasterdev XAD] (StuffIt.c) and [[The Unarchiver]] (XADStuffIt5Parser.m) source code
* [https://github.com/ParksProjets/Maconv/blob/master/docs/stuffit/Stuffit_v5.md Maconv: Stuffit 5 format]

Other information:
* [http://www.russotto.net/arseniccomp.html StuffIt method 15 compression format]

==Screenshots==
[[Image:Stuffit151-About.png|400px]]

== Sample files ==
* http://cd.textfiles.com/carousel344/MACTOSH/ ...
* https://telparia.com/fileFormatSamples/archive/sit/blackfor.sit
* [https://archive.org/details/Macintosh_Garden_Collection Macintosh Garden Collection] ...

== Other links ==
* [[Wikipedia:StuffIt|Wikipedia article]]

[[Category:Macintosh]]