2 #------------------------------------------------------------------------------
3 # $File: compress,v 1.42 2009/09/19 16:28:08 christos Exp $
4 # compress: file(1) magic for pure-compression formats (no archives)
6 # compress, gzip, pack, compact, huf, squeeze, crunch, freeze, yabba, etc.
8 # Formats for various forms of compressed data
9 # Formats for "compress" proper have been moved into "compress.c",
10 # because it tries to uncompress it to figure out what's inside.
12 # standard unix compress
13 0 string \037\235 compress'd data
14 !:mime application/x-compress
16 >2 byte&0x80 >0 block compressed
17 >2 byte&0x1f x %d bits
19 # gzip (GNU zip, not to be confused with Info-ZIP or PKWARE zip archiver)
20 # Edited by Chris Chittleborough <cchittleborough@yahoo.com.au>, March 2002
21 # * Original filename is only at offset 10 if "extra field" absent
22 # * Produce shorter output - notably, only report compression methods
23 # other than 8 ("deflate", the only method defined in RFC 1952).
24 0 string \037\213 gzip compressed data
25 !:mime application/x-gzip
26 >2 byte <8 \b, reserved method
27 >2 byte >8 \b, unknown method
28 >3 byte &0x01 \b, ASCII
29 >3 byte &0x02 \b, has CRC
30 >3 byte &0x04 \b, extra field
32 >>10 string x \b, was "%s"
33 >3 byte &0x10 \b, has comment
34 >9 byte =0x00 \b, from FAT filesystem (MS-DOS, OS/2, NT)
35 >9 byte =0x01 \b, from Amiga
36 >9 byte =0x02 \b, from VMS
37 >9 byte =0x03 \b, from Unix
38 >9 byte =0x04 \b, from VM/CMS
39 >9 byte =0x05 \b, from Atari
40 >9 byte =0x06 \b, from HPFS filesystem (OS/2, NT)
41 >9 byte =0x07 \b, from MacOS
42 >9 byte =0x08 \b, from Z-System
43 >9 byte =0x09 \b, from CP/M
44 >9 byte =0x0A \b, from TOPS/20
45 >9 byte =0x0B \b, from NTFS filesystem (NT)
46 >9 byte =0x0C \b, from QDOS
47 >9 byte =0x0D \b, from Acorn RISCOS
48 >3 byte &0x10 \b, comment
49 >3 byte &0x20 \b, encrypted
50 >4 ledate >0 \b, last modified: %s
51 >8 byte 2 \b, max compression
52 >8 byte 4 \b, max speed
54 # packed data, Huffman (minimum redundancy) codes on a byte-by-byte basis
55 0 string \037\036 packed data
56 !:mime application/octet-stream
57 >2 belong >1 \b, %d characters originally
58 >2 belong =1 \b, %d character originally
60 # This magic number is byte-order-independent.
61 0 short 0x1f1f old packed data
62 !:mime application/octet-stream
64 # XXX - why *two* entries for "compacted data", one of which is
65 # byte-order independent, and one of which is byte-order dependent?
67 0 short 0x1fff compacted data
68 !:mime application/octet-stream
69 # This string is valid for SunOS (BE) and a matching "short" is listed
70 # in the Ultrix (LE) magic file.
71 0 string \377\037 compacted data
72 !:mime application/octet-stream
73 0 short 0145405 huf output
74 !:mime application/octet-stream
77 0 string BZh bzip2 compressed data
78 !:mime application/x-bzip2
79 >3 byte >47 \b, block size = %c00k
82 0 string LZIP lzip compressed data
83 !:mime application/x-lzip
84 >4 byte x \b, version: %d
87 # Michael Haardt <michael@cantor.informatik.rwth-aachen.de>
88 0 beshort 0x76FF squeezed data,
89 >4 string x original name %s
90 0 beshort 0x76FE crunched data,
91 >2 string x original name %s
92 0 beshort 0x76FD LZH compressed data,
93 >2 string x original name %s
96 0 string \037\237 frozen file 2.1
97 0 string \037\236 frozen file 1.0 (or gzip 0.5)
99 # SCO compress -H (LZH)
100 0 string \037\240 SCO compress -H (LZH) data
102 # European GSM 06.10 is a provisional standard for full-rate speech
103 # transcoding, prI-ETS 300 036, which uses RPE/LTP (residual pulse
104 # excitation/long term prediction) coding at 13 kbit/s.
106 # There's only a magic nibble (4 bits); that nibble repeats every 33
107 # bytes. This isn't suited for use, but maybe we can use it someday.
109 # This will cause very short GSM files to be declared as data and
110 # mismatches to be declared as data too!
111 #0 byte&0xF0 0xd0 data
115 #>132 byte&0xF0 0xd0 GSM 06.10 compressed audio
117 # bzip a block-sorting file compressor
118 # by Julian Seward <sewardj@cs.man.ac.uk> and others
120 #0 string BZ bzip compressed data
121 #>2 byte x \b, version: %c
122 #>3 string =1 \b, compression block size 100k
123 #>3 string =2 \b, compression block size 200k
124 #>3 string =3 \b, compression block size 300k
125 #>3 string =4 \b, compression block size 400k
126 #>3 string =5 \b, compression block size 500k
127 #>3 string =6 \b, compression block size 600k
128 #>3 string =7 \b, compression block size 700k
129 #>3 string =8 \b, compression block size 800k
130 #>3 string =9 \b, compression block size 900k
132 # lzop from <markus.oberhumer@jk.uni-linz.ac.at>
133 0 string \x89\x4c\x5a\x4f\x00\x0d\x0a\x1a\x0a lzop compressed data
135 >>9 byte&0xf0 =0x00 - version 0.
136 >>9 beshort&0x0fff x \b%03x,
138 >>13 byte 2 LZO1X-1(15),
139 >>13 byte 3 LZO1X-999,
140 ## >>22 bedate >0 last modified: %s,
141 >>14 byte =0x00 os: MS-DOS
142 >>14 byte =0x01 os: Amiga
143 >>14 byte =0x02 os: VMS
144 >>14 byte =0x03 os: Unix
145 >>14 byte =0x05 os: Atari
146 >>14 byte =0x06 os: OS/2
147 >>14 byte =0x07 os: MacOS
148 >>14 byte =0x0A os: Tops/20
149 >>14 byte =0x0B os: WinNT
150 >>14 byte =0x0E os: Win32
152 >>9 byte&0xf0 =0x00 - version 0.
153 >>9 byte&0xf0 =0x10 - version 1.
154 >>9 byte&0xf0 =0x20 - version 2.
155 >>9 beshort&0x0fff x \b%03x,
157 >>15 byte 2 LZO1X-1(15),
158 >>15 byte 3 LZO1X-999,
159 ## >>25 bedate >0 last modified: %s,
160 >>17 byte =0x00 os: MS-DOS
161 >>17 byte =0x01 os: Amiga
162 >>17 byte =0x02 os: VMS
163 >>17 byte =0x03 os: Unix
164 >>17 byte =0x05 os: Atari
165 >>17 byte =0x06 os: OS/2
166 >>17 byte =0x07 os: MacOS
167 >>17 byte =0x0A os: Tops/20
168 >>17 byte =0x0B os: WinNT
169 >>17 byte =0x0E os: Win32
171 # 4.3BSD-Quasijarus Strong Compression
172 # http://minnie.tuhs.org/Quasijarus/compress.html
173 0 string \037\241 Quasijarus strong compressed data
175 # From: Cory Dikkers <cdikkers@swbell.net>
176 0 string XPKF Amiga xpkf.library compressed data
177 0 string PP11 Power Packer 1.1 compressed data
178 0 string PP20 Power Packer 2.0 compressed data,
179 >4 belong 0x09090909 fast compression
180 >4 belong 0x090A0A0A mediocre compression
181 >4 belong 0x090A0B0B good compression
182 >4 belong 0x090A0C0C very good compression
183 >4 belong 0x090A0C0D best compression
185 # 7-zip archiver, from Thomas Klausner (wiz@danbala.tuwien.ac.at)
186 # http://www.7-zip.org or DOC/7zFormat.txt
188 0 string 7z\274\257\047\034 7-zip archive data,
193 # URL: http://www.7-zip.org/sdk.html
194 # From: Robert Millan <rmh@aybabtu.com> and Reuben Thomas <rrt@sc3d.org>
195 # Commented out because apparently not reliable (according to Debian
197 #0 string ]\000\000\200\000 LZMA compressed data
199 # http://tukaani.org/xz/xz-file-format.txt
200 0 ustring \xFD7zXZ\x00 xz compressed data
201 !:mime application/x-xz
203 # AFX compressed files (Wolfram Kleff)
204 2 string -afx- AFX compressed file data
206 # Supplementary magic data for the file(1) command to support
207 # rzip(1). The format is described in magic(5).
209 # Copyright (C) 2003 by Andrew Tridgell. You may do whatever you want with
212 0 string RZIP rzip compressed data
213 >4 byte x - version %d
215 >6 belong x (%d bytes)
218 # URL: http://tukaani.org/xz/
219 0 string \xfd\x37\x7a\x58\x5a\x00 XZ compressed data
220 !:mime application/x-xz