xref: /dragonfly/contrib/file/magic/Magdir/compress (revision 6e278935)
1#------------------------------------------------------------------------------
2# $File: compress,v 1.47 2011/03/08 00:39:46 christos Exp $
3# compress:  file(1) magic for pure-compression formats (no archives)
4#
5# compress, gzip, pack, compact, huf, squeeze, crunch, freeze, yabba, etc.
6#
7# Formats for various forms of compressed data
8# Formats for "compress" proper have been moved into "compress.c",
9# because it tries to uncompress it to figure out what's inside.
10
11# standard unix compress
120	string		\037\235	compress'd data
13!:mime	application/x-compress
14!:apple	LZIVZIVU
15>2	byte&0x80	>0		block compressed
16>2	byte&0x1f	x		%d bits
17
18# gzip (GNU zip, not to be confused with Info-ZIP or PKWARE zip archiver)
19#   Edited by Chris Chittleborough <cchittleborough@yahoo.com.au>, March 2002
20#	* Original filename is only at offset 10 if "extra field" absent
21#	* Produce shorter output - notably, only report compression methods
22#         other than 8 ("deflate", the only method defined in RFC 1952).
230       string          \037\213        gzip compressed data
24!:mime	application/x-gzip
25>2	byte		<8		\b, reserved method
26>2	byte		>8		\b, unknown method
27>3	byte		&0x01		\b, ASCII
28>3	byte		&0x02		\b, has CRC
29>3	byte		&0x04		\b, extra field
30>3	byte&0xC	=0x08
31>>10	string		x		\b, was "%s"
32>3	byte		&0x10		\b, has comment
33>9	byte		=0x00		\b, from FAT filesystem (MS-DOS, OS/2, NT)
34>9	byte		=0x01		\b, from Amiga
35>9	byte		=0x02		\b, from VMS
36>9	byte		=0x03		\b, from Unix
37>9	byte		=0x04		\b, from VM/CMS
38>9	byte		=0x05		\b, from Atari
39>9	byte		=0x06		\b, from HPFS filesystem (OS/2, NT)
40>9	byte		=0x07		\b, from MacOS
41>9	byte		=0x08		\b, from Z-System
42>9	byte		=0x09		\b, from CP/M
43>9	byte		=0x0A		\b, from TOPS/20
44>9	byte		=0x0B		\b, from NTFS filesystem (NT)
45>9	byte		=0x0C		\b, from QDOS
46>9	byte		=0x0D		\b, from Acorn RISCOS
47>3	byte		&0x10		\b, comment
48>3	byte		&0x20		\b, encrypted
49>4	ledate		>0		\b, last modified: %s
50>8	byte		2		\b, max compression
51>8	byte		4		\b, max speed
52
53# packed data, Huffman (minimum redundancy) codes on a byte-by-byte basis
540	string		\037\036	packed data
55!:mime	application/octet-stream
56>2	belong		>1		\b, %d characters originally
57>2	belong		=1		\b, %d character originally
58#
59# This magic number is byte-order-independent.
600	short		0x1f1f		old packed data
61!:mime	application/octet-stream
62
63# XXX - why *two* entries for "compacted data", one of which is
64# byte-order independent, and one of which is byte-order dependent?
65#
660	short		0x1fff		compacted data
67!:mime	application/octet-stream
68# This string is valid for SunOS (BE) and a matching "short" is listed
69# in the Ultrix (LE) magic file.
700	string		\377\037	compacted data
71!:mime	application/octet-stream
720	short		0145405		huf output
73!:mime	application/octet-stream
74
75# bzip2
760	string		BZh		bzip2 compressed data
77!:mime	application/x-bzip2
78>3	byte		>47		\b, block size = %c00k
79
80# lzip
810	string		LZIP		lzip compressed data
82!:mime application/x-lzip
83>4	byte		x		\b, version: %d
84
85# squeeze and crunch
86# Michael Haardt <michael@cantor.informatik.rwth-aachen.de>
870	beshort		0x76FF		squeezed data,
88>4	string		x		original name %s
890	beshort		0x76FE		crunched data,
90>2	string		x		original name %s
910	beshort		0x76FD		LZH compressed data,
92>2	string		x		original name %s
93
94# Freeze
950	string		\037\237	frozen file 2.1
960	string		\037\236	frozen file 1.0 (or gzip 0.5)
97
98# SCO compress -H (LZH)
990	string		\037\240	SCO compress -H (LZH) data
100
101# European GSM 06.10 is a provisional standard for full-rate speech
102# transcoding, prI-ETS 300 036, which uses RPE/LTP (residual pulse
103# excitation/long term prediction) coding at 13 kbit/s.
104#
105# There's only a magic nibble (4 bits); that nibble repeats every 33
106# bytes.  This isn't suited for use, but maybe we can use it someday.
107#
108# This will cause very short GSM files to be declared as data and
109# mismatches to be declared as data too!
110#0	byte&0xF0	0xd0		data
111#>33	byte&0xF0	0xd0
112#>66	byte&0xF0	0xd0
113#>99	byte&0xF0	0xd0
114#>132	byte&0xF0	0xd0		GSM 06.10 compressed audio
115
116# bzip	a block-sorting file compressor
117#	by Julian Seward <sewardj@cs.man.ac.uk> and others
118#
119#0	string		BZ		bzip compressed data
120#>2	byte		x		\b, version: %c
121#>3	string		=1		\b, compression block size 100k
122#>3	string		=2		\b, compression block size 200k
123#>3	string		=3		\b, compression block size 300k
124#>3	string		=4		\b, compression block size 400k
125#>3	string		=5		\b, compression block size 500k
126#>3	string		=6		\b, compression block size 600k
127#>3	string		=7		\b, compression block size 700k
128#>3	string		=8		\b, compression block size 800k
129#>3	string		=9		\b, compression block size 900k
130
131# lzop from <markus.oberhumer@jk.uni-linz.ac.at>
1320	string		\x89\x4c\x5a\x4f\x00\x0d\x0a\x1a\x0a	lzop compressed data
133>9	beshort		<0x0940
134>>9	byte&0xf0	=0x00		- version 0.
135>>9	beshort&0x0fff	x		\b%03x,
136>>13	byte		1		LZO1X-1,
137>>13	byte		2		LZO1X-1(15),
138>>13	byte		3		LZO1X-999,
139## >>22	bedate		>0		last modified: %s,
140>>14	byte		=0x00		os: MS-DOS
141>>14	byte		=0x01		os: Amiga
142>>14	byte		=0x02		os: VMS
143>>14	byte		=0x03		os: Unix
144>>14	byte		=0x05		os: Atari
145>>14	byte		=0x06		os: OS/2
146>>14	byte		=0x07		os: MacOS
147>>14	byte		=0x0A		os: Tops/20
148>>14	byte		=0x0B		os: WinNT
149>>14	byte		=0x0E		os: Win32
150>9	beshort		>0x0939
151>>9	byte&0xf0	=0x00		- version 0.
152>>9	byte&0xf0	=0x10		- version 1.
153>>9	byte&0xf0	=0x20		- version 2.
154>>9	beshort&0x0fff	x		\b%03x,
155>>15	byte		1		LZO1X-1,
156>>15	byte		2		LZO1X-1(15),
157>>15	byte		3		LZO1X-999,
158## >>25	bedate		>0		last modified: %s,
159>>17	byte		=0x00		os: MS-DOS
160>>17	byte		=0x01		os: Amiga
161>>17	byte		=0x02		os: VMS
162>>17	byte		=0x03		os: Unix
163>>17	byte		=0x05		os: Atari
164>>17	byte		=0x06		os: OS/2
165>>17	byte		=0x07		os: MacOS
166>>17	byte		=0x0A		os: Tops/20
167>>17	byte		=0x0B		os: WinNT
168>>17	byte		=0x0E		os: Win32
169
170# 4.3BSD-Quasijarus Strong Compression
171# http://minnie.tuhs.org/Quasijarus/compress.html
1720	string		\037\241	Quasijarus strong compressed data
173
174# From: Cory Dikkers <cdikkers@swbell.net>
1750	string		XPKF		Amiga xpkf.library compressed data
1760	string		PP11		Power Packer 1.1 compressed data
1770	string		PP20		Power Packer 2.0 compressed data,
178>4	belong		0x09090909	fast compression
179>4	belong		0x090A0A0A	mediocre compression
180>4	belong		0x090A0B0B	good compression
181>4	belong		0x090A0C0C	very good compression
182>4	belong		0x090A0C0D	best compression
183
184# 7-zip archiver, from Thomas Klausner (wiz@danbala.tuwien.ac.at)
185# http://www.7-zip.org or DOC/7zFormat.txt
186#
1870	string		7z\274\257\047\034	7-zip archive data,
188>6	byte		x			version %d
189>7	byte		x			\b.%d
190!:mime	application/x-7z-compressed
191
192# Type: LZMA
1930	lelong		0x8000005d		LZMA compressed data,
194>5	lequad		=0xffffffffffffffff	streamed
195>5	lequad		!0xffffffffffffffff	non-streamed, size %lld
196!:mime	application/x-lzma
197
198# http://tukaani.org/xz/xz-file-format.txt
1990	ustring		\xFD7zXZ\x00		XZ compressed data
200!:mime	application/x-xz
201
202# https://github.com/ckolivas/lrzip/blob/master/doc/magic.header.txt
2030	string		LRZI			LRZIP compressed data
204>4	byte		x			- version %d
205>5	byte		x			\b.%d
206!:mime	application/x-lrzip
207
208# AFX compressed files (Wolfram Kleff)
2092	string		-afx-		AFX compressed file data
210
211# Supplementary magic data for the file(1) command to support
212# rzip(1).  The format is described in magic(5).
213#
214# Copyright (C) 2003 by Andrew Tridgell.  You may do whatever you want with
215# this file.
216#
2170	string		RZIP		rzip compressed data
218>4	byte		x		- version %d
219>5	byte		x		\b.%d
220>6	belong		x		(%d bytes)
221
2220	string		ArC\x01		FreeArc archive <http://freearc.org>
223
224# Type:	DACT compressed files
2250	long	0x444354C3	DACT compressed data
226>4	byte	>-1		(version %i.
227>5	byte	>-1		%i.
228>6	byte	>-1		%i)
229>7	long	>0		, original size: %i bytes
230>15	long	>30		, block size: %i bytes
231