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, continuation
26 >3 byte &0x04 \b, extra field
28 >>10 string x \b, was "%s"
29 >9 byte =0x00 \b, from MS-DOS
30 >9 byte =0x01 \b, from Amiga
31 >9 byte =0x02 \b, from VMS
32 >9 byte =0x03 \b, from Unix
33 >9 byte =0x05 \b, from Atari
34 >9 byte =0x06 \b, from OS/2
35 >9 byte =0x07 \b, from MacOS
36 >9 byte =0x0A \b, from Tops/20
37 >9 byte =0x0B \b, from Win/32
38 >3 byte &0x10 \b, comment
39 >3 byte &0x20 \b, encrypted
40 ### >4 ledate x last modified: %s,
41 >8 byte 2 \b, max compression
42 >8 byte 4 \b, max speed
44 # packed data, Huffman (minimum redundancy) codes on a byte-by-byte basis
45 0 string \037\036 packed data
46 >2 belong >1 \b, %d characters originally
47 >2 belong =1 \b, %d character originally
49 # This magic number is byte-order-independent.
50 0 short 0x1f1f old packed data
52 # XXX - why *two* entries for "compacted data", one of which is
53 # byte-order independent, and one of which is byte-order dependent?
55 0 short 0x1fff compacted data
56 # This string is valid for SunOS (BE) and a matching "short" is listed
57 # in the Ultrix (LE) magic file.
58 0 string \377\037 compacted data
59 0 short 0145405 huf output
62 0 string BZh bzip2 compressed data
63 >3 byte >47 \b, block size = %c00k
66 # Michael Haardt <michael@cantor.informatik.rwth-aachen.de>
67 0 beshort 0x76FF squeezed data,
68 >4 string x original name %s
69 0 beshort 0x76FE crunched data,
70 >2 string x original name %s
71 0 beshort 0x76FD LZH compressed data,
72 >2 string x original name %s
75 0 string \037\237 frozen file 2.1
76 0 string \037\236 frozen file 1.0 (or gzip 0.5)
78 # SCO compress -H (LZH)
79 0 string \037\240 SCO compress -H (LZH) data
81 # European GSM 06.10 is a provisional standard for full-rate speech
82 # transcoding, prI-ETS 300 036, which uses RPE/LTP (residual pulse
83 # excitation/long term prediction) coding at 13 kbit/s.
85 # There's only a magic nibble (4 bits); that nibble repeats every 33
86 # bytes. This isn't suited for use, but maybe we can use it someday.
88 # This will cause very short GSM files to be declared as data and
89 # mismatches to be declared as data too!
90 #0 byte&0xF0 0xd0 data
94 #>132 byte&0xF0 0xd0 GSM 06.10 compressed audio
96 # bzip a block-sorting file compressor
97 # by Julian Seward <sewardj@cs.man.ac.uk> and others
99 0 string BZ bzip compressed data
100 >2 byte x \b, version: %c
101 >3 string =1 \b, compression block size 100k
102 >3 string =2 \b, compression block size 200k
103 >3 string =3 \b, compression block size 300k
104 >3 string =4 \b, compression block size 400k
105 >3 string =5 \b, compression block size 500k
106 >3 string =6 \b, compression block size 600k
107 >3 string =7 \b, compression block size 700k
108 >3 string =8 \b, compression block size 800k
109 >3 string =9 \b, compression block size 900k
111 # lzop from <markus.oberhumer@jk.uni-linz.ac.at>
112 0 string \x89\x4c\x5a\x4f\x00\x0d\x0a\x1a\x0a lzop compressed data
114 >>9 byte&0xf0 =0x00 - version 0.
115 >>9 beshort&0x0fff x \b%03x,
117 >>13 byte 2 LZO1X-1(15),
118 >>13 byte 3 LZO1X-999,
119 ## >>22 bedate >0 last modified: %s,
120 >>14 byte =0x00 os: MS-DOS
121 >>14 byte =0x01 os: Amiga
122 >>14 byte =0x02 os: VMS
123 >>14 byte =0x03 os: Unix
124 >>14 byte =0x05 os: Atari
125 >>14 byte =0x06 os: OS/2
126 >>14 byte =0x07 os: MacOS
127 >>14 byte =0x0A os: Tops/20
128 >>14 byte =0x0B os: WinNT
129 >>14 byte =0x0E os: Win32
131 >>9 byte&0xf0 =0x00 - version 0.
132 >>9 byte&0xf0 =0x10 - version 1.
133 >>9 byte&0xf0 =0x20 - version 2.
134 >>9 beshort&0x0fff x \b%03x,
136 >>15 byte 2 LZO1X-1(15),
137 >>15 byte 3 LZO1X-999,
138 ## >>25 bedate >0 last modified: %s,
139 >>17 byte =0x00 os: MS-DOS
140 >>17 byte =0x01 os: Amiga
141 >>17 byte =0x02 os: VMS
142 >>17 byte =0x03 os: Unix
143 >>17 byte =0x05 os: Atari
144 >>17 byte =0x06 os: OS/2
145 >>17 byte =0x07 os: MacOS
146 >>17 byte =0x0A os: Tops/20
147 >>17 byte =0x0B os: WinNT
148 >>17 byte =0x0E os: Win32
150 # 4.3BSD-Quasijarus Strong Compression
151 # http://minnie.tuhs.org/Quasijarus/compress.html
152 0 string \037\241 Quasijarus strong compressed data
154 # From: Cory Dikkers <cdikkers@swbell.net>
155 0 string XPKF Amiga xpkf.library compressed data
156 0 string PP11 Power Packer 1.1 compressed data
157 0 string PP20 Power Packer 2.0 compressed data,
158 >4 belong 0x09090909 fast compression
159 >4 belong 0x090A0A0A mediocre compression
160 >4 belong 0x090A0B0B good compression
161 >4 belong 0x090A0C0C very good compression
162 >4 belong 0x090A0C0D best compression
164 # 7z archiver, from Thomas Klausner (wiz@danbala.tuwien.ac.at)
165 # http://www.7-zip.org or DOC/7zFormat.txt
167 0 string 7z\274\257\047\034 7z archive data,
171 # AFX compressed files (Wolfram Kleff)
172 2 string -afx- AFX compressed file data