PAK (ARC extension)
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'''PAK''' is a DOS utility for managing compressed archive files, developed by NoGate Consulting. It is also the name of one of the file formats it supports: .PAK format. | '''PAK''' is a DOS utility for managing compressed archive files, developed by NoGate Consulting. It is also the name of one of the file formats it supports: .PAK format. | ||
| − | PAK format is an extension of [[ARC (compression format)|ARC]] format. The differences are that it may use some PAK-specific compression methods ( | + | PAK format is an extension of [[ARC (compression format)|ARC]] format. The differences are that it may use some PAK-specific compression methods (see below), and that it has some features made possible by "extended records" stored after the end-of-archive marker. |
PAK was originally named '''GSARC''' (and used filename extension .ARC), but was quickly renamed to PAK (and the default extension changed to .PAK). | PAK was originally named '''GSARC''' (and used filename extension .ARC), but was quickly renamed to PAK (and the default extension changed to .PAK). | ||
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== Disambiguation == | == Disambiguation == | ||
See [[PAK]] for more formats named PAK. | See [[PAK]] for more formats named PAK. | ||
| + | |||
| + | == Compression methods == | ||
| + | ARC compression methods unique to PAK: | ||
| + | |||
| + | {| class="wikitable" | ||
| + | ! ID !! Name !! Description and remarks | ||
| + | |- | ||
| + | |10 || Crushed || [[RLE90]] + [[LZW]] (or [[LZMW]]?) | ||
| + | |- | ||
| + | |11 || Distilled || [[LZ77 with Huffman coding|LZ77 + static Huffman coding]]. Introduced in PAK v2.0. | ||
| + | |} | ||
| + | |||
| + | For other ARC compression methods, see [[ARC (compression format)#Compression methods]]. | ||
== Specifications == | == Specifications == | ||
Revision as of 14:36, 13 June 2021
PAK is a DOS utility for managing compressed archive files, developed by NoGate Consulting. It is also the name of one of the file formats it supports: .PAK format.
PAK format is an extension of ARC format. The differences are that it may use some PAK-specific compression methods (see below), and that it has some features made possible by "extended records" stored after the end-of-archive marker.
PAK was originally named GSARC (and used filename extension .ARC), but was quickly renamed to PAK (and the default extension changed to .PAK).
See ARC for more information relevant to PAK format. See also SDN (SDN Project).
Contents |
Disambiguation
See PAK for more formats named PAK.
Compression methods
ARC compression methods unique to PAK:
| ID | Name | Description and remarks |
|---|---|---|
| 10 | Crushed | RLE90 + LZW (or LZMW?) |
| 11 | Distilled | LZ77 + static Huffman coding. Introduced in PAK v2.0. |
For other ARC compression methods, see ARC (compression format)#Compression methods.
Specifications
The PAK.DOC file contained in the v2.51 distribution includes basic information about .PAK/.ARC format, including the extended records. It does not document the compression schemes in detail.
Software
- GSARC v1.0 (1988-10-13) (DOS binary)
- PAK (DOS binaries)
- The Unarchiver - Supports the PAK-specific compression schemes
