127 lines
3.9 KiB
Plaintext
127 lines
3.9 KiB
Plaintext
#------------------------------------------------------------------------------
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# $File: zip,v 1.8 2021/10/24 15:53:56 christos Exp $
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# zip: file(1) magic for zip files; this is not use
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# Note the version of magic in archive is currently stronger, this is
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# just an example until negative offsets are supported better
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# Note: All fields unless otherwise noted are unsigned!
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# Zip Central Directory record
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0 name zipcd
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>0 string PK\001\002 Zip archive data
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!:mime application/zip
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# no "made by" in local file header with PK\3\4 magic
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>>4 leshort x \b, made by
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>>4 use zipversion
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>>4 use ziphost
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# inside ./archive 1.151 called "at least" zipversion "to extract"
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>>6 leshort x \b, extract using at least
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>>6 use zipversion
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# This is DOS date like: ledate 21:00:48 19 Dec 2001 != DOS 00:00 1 Jan 2010 ~ 0000213C
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>>12 ulelong x \b, last modified
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>>14 lemsdosdate x \b, last modified %s
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>>12 lemsdostime x %s
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# uncompressed size of 1st entry; FFffFFff means real value stored in ZIP64 record
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>>24 ulelong !0xFFffFFff \b, uncompressed size %u
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# inside ./archive 1.151 called "compression method="zipcompression
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>>10 leshort x \b, method=
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>>10 use zipcompression
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# URL: https://en.wikipedia.org/wiki/Zip_(file_format)
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# reference: https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT (Version: 6.3.9)
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# Zip known compressions
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0 name zipcompression
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>0 leshort 0 \bstore
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>0 leshort 1 \bShrinking
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>0 leshort 6 \bImploding
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>0 leshort 7 \bTokenizing
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>0 leshort 8 \bdeflate
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>0 leshort 9 \bdeflate64
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>0 leshort 10 \bLibrary imploding
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#>0 leshort 11 \bReserved by PKWARE
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>0 leshort 12 \bbzip2
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#>0 leshort 13 \bReserved by PKWARE
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>0 leshort 14 \blzma
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#>0 leshort 15 \bReserved by PKWARE
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>0 leshort 16 \bCMPSC (IBM z/OS)
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#>0 leshort 17 \bReserved by PKWARE
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>0 leshort 18 \bIBM TERSE
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>0 leshort 19 \bIBM LZ77 (z/Architecture)
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>0 leshort 20 \bZstd (deprecated)
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>0 leshort 93 \bZstd
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>0 leshort 94 \bMP3
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>0 leshort 95 \bxz
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>0 leshort 96 \bJpeg
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>0 leshort 97 \bWavPack
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>0 leshort 98 \bPPMd
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>0 leshort 99 \bAES Encrypted
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>0 default x
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>>0 leshort x \b[%#x]
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# Zip known versions
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0 name zipversion
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# The lower byte indicates the ZIP version of this file. The value/10 indicates
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# the major version number, and the value mod 10 is the minor version number.
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>0 ubyte/10 x v%u
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>0 ubyte%10 x \b.%u
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# >0 leshort 0x09 v0.9
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# >0 leshort 0x0a v1.0
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# >0 leshort 0x0b v1.1
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# >0 leshort 0x14 v2.0
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# >0 leshort 0x15 v2.1
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# >0 leshort 0x19 v2.5
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# >0 leshort 0x1b v2.7
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# >0 leshort 0x2d v4.5
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# >0 leshort 0x2e v4.6
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# >0 leshort 0x32 v5.0
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# >0 leshort 0x33 v5.1
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# >0 leshort 0x34 v5.2
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# >0 leshort 0x3d v6.1
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# >0 leshort 0x3e v6.2
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# >0 leshort 0x3f v6.3
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# >0 default x
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# >>0 leshort x v?[%#x]
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# display compatible host system name of ZIP archive
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0 name ziphost
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# The upper byte indicates the compatibility of the file attribute information.
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# If the file is compatible with MS-DOS (v 2.04g) then this value will be zero.
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#>1 ubyte 0 DOS
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>1 ubyte 1 Amiga
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>1 ubyte 2 OpenVMS
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>1 ubyte 3 UNIX
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>1 ubyte 4 VM/CMS
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>1 ubyte 6 OS/2
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>1 ubyte 7 Macintosh
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>1 ubyte 11 MVS
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>1 ubyte 13 Acorn Risc
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>1 ubyte 16 BeOS
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>1 ubyte 17 Tandem
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# 9 untested
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>1 ubyte 5 Atari ST
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>1 ubyte 8 Z-System
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>1 ubyte 9 CP/M
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>1 ubyte 10 Windows NTFS
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>1 ubyte 12 VSE
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>1 ubyte 14 VFAT
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>1 ubyte 15 alternate MVS
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>1 ubyte 18 OS/400
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>1 ubyte 19 OS X
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# unused
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#>1 ubyte >19 unused %#x
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# Zip End Of Central Directory record
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# GRR: wrong for ZIP with comment archive
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-22 string PK\005\006
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#>4 uleshort !0xFFff \b, %u disks
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#>6 uleshort !0xFFff \b, central directory disk %u
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#>8 uleshort !0xFFff \b, %u central directories on this disk
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#>10 uleshort !0xFFff \b, %u central directories
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#>12 ulelong !0xFFffFFff \b, %u central directory bytes
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# offset of central directory
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#>16 ulelong x \b, central directory offset %#x
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>(16.l) use zipcd
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# archive comment length n
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#>>20 uleshort >0 \b, comment length %u
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# archive comment
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>>20 pstring/l >0 \b, %s
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