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Diffstat (limited to 'contrib/file/Magdir/compress')
-rw-r--r-- | contrib/file/Magdir/compress | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/contrib/file/Magdir/compress b/contrib/file/Magdir/compress new file mode 100644 index 0000000..f4fe4a4 --- /dev/null +++ b/contrib/file/Magdir/compress @@ -0,0 +1,146 @@ + +#------------------------------------------------------------------------------ +# compress: file(1) magic for pure-compression formats (no archives) +# +# compress, gzip, pack, compact, huf, squeeze, crunch, freeze, yabba, etc. +# +# Formats for various forms of compressed data +# Formats for "compress" proper have been moved into "compress.c", +# because it tries to uncompress it to figure out what's inside. + +# standard unix compress +0 string \037\235 compress'd data +>2 byte&0x80 >0 block compressed +>2 byte&0x1f x %d bits + +# gzip (GNU zip, not to be confused with Info-ZIP or PKWARE zip archiver) +0 string \037\213 gzip compressed data +>2 byte <8 \b, reserved method, +>2 byte 8 \b, deflated, +>3 byte &0x01 ASCII, +>3 byte &0x02 continuation, +>3 byte &0x04 extra field, +>3 byte &0x08 original filename, +>>10 string x `%s', +>3 byte &0x10 comment, +>3 byte &0x20 encrypted, +>4 ledate x last modified: %s, +>8 byte 2 max compression, +>8 byte 4 max speed, +>9 byte =0x00 os: MS-DOS +>9 byte =0x01 os: Amiga +>9 byte =0x02 os: VMS +>9 byte =0x03 os: Unix +>9 byte =0x05 os: Atari +>9 byte =0x06 os: OS/2 +>9 byte =0x07 os: MacOS +>9 byte =0x0A os: Tops/20 +>9 byte =0x0B os: Win/32 + +# packed data, Huffman (minimum redundancy) codes on a byte-by-byte basis +0 string \037\036 packed data +>2 belong >1 \b, %d characters originally +>2 belong =1 \b, %d character originally +# +# This magic number is byte-order-independent. XXX - Does that mean this +# is big-endian, little-endian, either, or that you can't tell? +# this short is valid for SunOS +0 short 017437 old packed data + +# XXX - why *two* entries for "compacted data", one of which is +# byte-order independent, and one of which is byte-order dependent? +# +0 short 0x1fff compacted data +# This string is valid for SunOS (BE) and a matching "short" is listed +# in the Ultrix (LE) magic file. +0 string \377\037 compacted data +0 short 0145405 huf output + +# bzip2 +0 string BZh bzip2 compressed data +>3 byte >47 \b, block size = %c00k + +# squeeze and crunch +# Michael Haardt <michael@cantor.informatik.rwth-aachen.de> +0 beshort 0x76FF squeezed data, +>4 string x original name %s +0 beshort 0x76FE crunched data, +>2 string x original name %s +0 beshort 0x76FD LZH compressed data, +>2 string x original name %s + +# Freeze +0 string \037\237 frozen file 2.1 +0 string \037\236 frozen file 1.0 (or gzip 0.5) + +# SCO compress -H (LZH) +0 string \037\240 SCO compress -H (LZH) data + +# European GSM 06.10 is a provisional standard for full-rate speech +# transcoding, prI-ETS 300 036, which uses RPE/LTP (residual pulse +# excitation/long term prediction) coding at 13 kbit/s. +# +# There's only a magic nibble (4 bits); that nibble repeats every 33 +# bytes. This isn't suited for use, but maybe we can use it someday. +# +# This will cause very short GSM files to be declared as data and +# mismatches to be declared as data too! +#0 byte&0xF0 0xd0 data +#>33 byte&0xF0 0xd0 +#>66 byte&0xF0 0xd0 +#>99 byte&0xF0 0xd0 +#>132 byte&0xF0 0xd0 GSM 06.10 compressed audio + +# bzip a block-sorting file compressor +# by Julian Seward <sewardj@cs.man.ac.uk> and others +# +0 string BZ bzip compressed data +>2 byte x \b, version: %c +>3 string =1 \b, compression block size 100k +>3 string =2 \b, compression block size 200k +>3 string =3 \b, compression block size 300k +>3 string =4 \b, compression block size 400k +>3 string =5 \b, compression block size 500k +>3 string =6 \b, compression block size 600k +>3 string =7 \b, compression block size 700k +>3 string =8 \b, compression block size 800k +>3 string =9 \b, compression block size 900k + +# lzop from <markus.oberhumer@jk.uni-linz.ac.at> +0 string \x89\x4c\x5a\x4f\x00\x0d\x0a\x1a\x0a lzop compressed data +>9 beshort <0x0940 +>>9 byte&0xf0 =0x00 - version 0. +>>9 beshort&0x0fff x \b%03x, +>>13 byte 1 LZO1X-1, +>>13 byte 2 LZO1X-1(15), +>>13 byte 3 LZO1X-999, +## >>22 bedate >0 last modified: %s, +>>14 byte =0x00 os: MS-DOS +>>14 byte =0x01 os: Amiga +>>14 byte =0x02 os: VMS +>>14 byte =0x03 os: Unix +>>14 byte =0x05 os: Atari +>>14 byte =0x06 os: OS/2 +>>14 byte =0x07 os: MacOS +>>14 byte =0x0A os: Tops/20 +>>14 byte =0x0B os: WinNT +>>14 byte =0x0E os: Win32 +>9 beshort >0x0939 +>>9 byte&0xf0 =0x00 - version 0. +>>9 byte&0xf0 =0x10 - version 1. +>>9 byte&0xf0 =0x20 - version 2. +>>9 beshort&0x0fff x \b%03x, +>>15 byte 1 LZO1X-1, +>>15 byte 2 LZO1X-1(15), +>>15 byte 3 LZO1X-999, +## >>25 bedate >0 last modified: %s, +>>17 byte =0x00 os: MS-DOS +>>17 byte =0x01 os: Amiga +>>17 byte =0x02 os: VMS +>>17 byte =0x03 os: Unix +>>17 byte =0x05 os: Atari +>>17 byte =0x06 os: OS/2 +>>17 byte =0x07 os: MacOS +>>17 byte =0x0A os: Tops/20 +>>17 byte =0x0B os: WinNT +>>17 byte =0x0E os: Win32 |