2 #------------------------------------------------------------------------------
3 # compress: file(1) magic for pure-compression formats (no archives)
5 # compress, gzip, pack, compact, huf, squeeze, crunch, freeze, yabba, etc.
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.
11 # standard unix compress
12 0 string \037\235 compress'd data
13 >2 byte&0x80 >0 block compressed
14 >2 byte&0x1f x %d bits
16 # gzip (GNU zip, not to be confused with Info-ZIP or PKWARE zip archiver)
17 # Edited by Chris Chittleborough <cchittleborough@yahoo.com.au>, March 2002
18 # * Original filename is only at offset 10 if "extra field" absent
19 # * Produce shorter output - notably, only report compression methods
20 # other than 8 ("deflate", the only method defined in RFC 1952).
21 0 string \037\213 gzip compressed data
22 >2 byte <8 \b, reserved method
23 >2 byte >8 \b, unknown method
24 >3 byte &0x01 \b, ASCII
25 >3 byte &0x02 \b, has CRC
26 >3 byte &0x04 \b, extra field
28 >>10 string x \b, was "%s"
29 >3 byte &0x10 \b, has comment
30 >9 byte =0x00 \b, from FAT filesystem (MS-DOS, OS/2, NT)
31 >9 byte =0x01 \b, from Amiga
32 >9 byte =0x02 \b, from VMS
33 >9 byte =0x03 \b, from Unix
34 >9 byte =0x04 \b, from VM/CMS
35 >9 byte =0x05 \b, from Atari
36 >9 byte =0x06 \b, from HPFS filesystem (OS/2, NT)
37 >9 byte =0x07 \b, from MacOS
38 >9 byte =0x08 \b, from Z-System
39 >9 byte =0x09 \b, from CP/M
40 >9 byte =0x0A \b, from TOPS/20
41 >9 byte =0x0B \b, from NTFS filesystem (NT)
42 >9 byte =0x0C \b, from QDOS
43 >9 byte =0x0D \b, from Acorn RISCOS
44 >3 byte &0x10 \b, comment
45 >3 byte &0x20 \b, encrypted
46 >4 ledate >0 \b, last modified: %s
47 >8 byte 2 \b, max compression
48 >8 byte 4 \b, max speed
50 # packed data, Huffman (minimum redundancy) codes on a byte-by-byte basis
51 0 string \037\036 packed data
52 >2 belong >1 \b, %d characters originally
53 >2 belong =1 \b, %d character originally
55 # This magic number is byte-order-independent.
56 0 short 0x1f1f old packed data
58 # XXX - why *two* entries for "compacted data", one of which is
59 # byte-order independent, and one of which is byte-order dependent?
61 0 short 0x1fff compacted data
62 # This string is valid for SunOS (BE) and a matching "short" is listed
63 # in the Ultrix (LE) magic file.
64 0 string \377\037 compacted data
65 0 short 0145405 huf output
68 0 string BZh bzip2 compressed data
69 >3 byte >47 \b, block size = %c00k
72 # Michael Haardt <michael@cantor.informatik.rwth-aachen.de>
73 0 beshort 0x76FF squeezed data,
74 >4 string x original name %s
75 0 beshort 0x76FE crunched data,
76 >2 string x original name %s
77 0 beshort 0x76FD LZH compressed data,
78 >2 string x original name %s
81 0 string \037\237 frozen file 2.1
82 0 string \037\236 frozen file 1.0 (or gzip 0.5)
84 # SCO compress -H (LZH)
85 0 string \037\240 SCO compress -H (LZH) data
87 # European GSM 06.10 is a provisional standard for full-rate speech
88 # transcoding, prI-ETS 300 036, which uses RPE/LTP (residual pulse
89 # excitation/long term prediction) coding at 13 kbit/s.
91 # There's only a magic nibble (4 bits); that nibble repeats every 33
92 # bytes. This isn't suited for use, but maybe we can use it someday.
94 # This will cause very short GSM files to be declared as data and
95 # mismatches to be declared as data too!
96 #0 byte&0xF0 0xd0 data
100 #>132 byte&0xF0 0xd0 GSM 06.10 compressed audio
102 # bzip a block-sorting file compressor
103 # by Julian Seward <sewardj@cs.man.ac.uk> and others
105 0 string BZ bzip compressed data
106 >2 byte x \b, version: %c
107 >3 string =1 \b, compression block size 100k
108 >3 string =2 \b, compression block size 200k
109 >3 string =3 \b, compression block size 300k
110 >3 string =4 \b, compression block size 400k
111 >3 string =5 \b, compression block size 500k
112 >3 string =6 \b, compression block size 600k
113 >3 string =7 \b, compression block size 700k
114 >3 string =8 \b, compression block size 800k
115 >3 string =9 \b, compression block size 900k
117 # lzop from <markus.oberhumer@jk.uni-linz.ac.at>
118 0 string \x89\x4c\x5a\x4f\x00\x0d\x0a\x1a\x0a lzop compressed data
120 >>9 byte&0xf0 =0x00 - version 0.
121 >>9 beshort&0x0fff x \b%03x,
123 >>13 byte 2 LZO1X-1(15),
124 >>13 byte 3 LZO1X-999,
125 ## >>22 bedate >0 last modified: %s,
126 >>14 byte =0x00 os: MS-DOS
127 >>14 byte =0x01 os: Amiga
128 >>14 byte =0x02 os: VMS
129 >>14 byte =0x03 os: Unix
130 >>14 byte =0x05 os: Atari
131 >>14 byte =0x06 os: OS/2
132 >>14 byte =0x07 os: MacOS
133 >>14 byte =0x0A os: Tops/20
134 >>14 byte =0x0B os: WinNT
135 >>14 byte =0x0E os: Win32
137 >>9 byte&0xf0 =0x00 - version 0.
138 >>9 byte&0xf0 =0x10 - version 1.
139 >>9 byte&0xf0 =0x20 - version 2.
140 >>9 beshort&0x0fff x \b%03x,
142 >>15 byte 2 LZO1X-1(15),
143 >>15 byte 3 LZO1X-999,
144 ## >>25 bedate >0 last modified: %s,
145 >>17 byte =0x00 os: MS-DOS
146 >>17 byte =0x01 os: Amiga
147 >>17 byte =0x02 os: VMS
148 >>17 byte =0x03 os: Unix
149 >>17 byte =0x05 os: Atari
150 >>17 byte =0x06 os: OS/2
151 >>17 byte =0x07 os: MacOS
152 >>17 byte =0x0A os: Tops/20
153 >>17 byte =0x0B os: WinNT
154 >>17 byte =0x0E os: Win32
156 # 4.3BSD-Quasijarus Strong Compression
157 # http://minnie.tuhs.org/Quasijarus/compress.html
158 0 string \037\241 Quasijarus strong compressed data
160 # From: Cory Dikkers <cdikkers@swbell.net>
161 0 string XPKF Amiga xpkf.library compressed data
162 0 string PP11 Power Packer 1.1 compressed data
163 0 string PP20 Power Packer 2.0 compressed data,
164 >4 belong 0x09090909 fast compression
165 >4 belong 0x090A0A0A mediocre compression
166 >4 belong 0x090A0B0B good compression
167 >4 belong 0x090A0C0C very good compression
168 >4 belong 0x090A0C0D best compression
170 # 7-zip archiver, from Thomas Klausner (wiz@danbala.tuwien.ac.at)
171 # http://www.7-zip.org or DOC/7zFormat.txt
173 0 string 7z\274\257\047\034 7-zip archive data,
177 # AFX compressed files (Wolfram Kleff)
178 2 string -afx- AFX compressed file data
180 # Supplementary magic data for the file(1) command to support
181 # rzip(1). The format is described in magic(5).
183 # Copyright (C) 2003 by Andrew Tridgell. You may do whatever you want with
186 0 string RZIP rzip compressed data
187 >4 byte x - version %d
189 >6 belong x (%d bytes)