#------------------------------------------------------------------------------
# $File: compress,v 1.96 2024/11/09 23:47:04 christos Exp $
# 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
!:mime	application/x-compress
!:apple	LZIVZIVU
!:ext	Z
>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)
# URL: https://en.wikipedia.org/wiki/Gzip
# Reference: https://tools.ietf.org/html/rfc1952
# Update: Joerg Jenderek, Apr 2019, Dec 2022
#   Edited by Chris Chittleborough <cchittleborough@yahoo.com.au>, March 2002
#	* Original filename is only at offset 10 if "extra field" absent
#	* Produce shorter output - notably, only report compression methods
#         other than 8 ("deflate", the only method defined in RFC 1952).
# Note: find defs -iname '*.trid.xml' -exec grep -q '<Bytes>1F8B08' {} \; -ls
# TODO:
# FBR	Blueberry FlashBack screen Record	https://www.flashbackrecorder.com/
# KPR	KOffice/Calligra KPresenter		application/x-kpresenter
# KPT	KOffice/Calligra KPresenter template?	application/x-kpresenter
# SAV	Diggles Saved Game File			http://www.innonics.com
# SAV	FarCry (demo) saved game		http://www.farcry-thegame.com
# DAT	ZOAGZIP game data format		http://en.wikipedia.org/wiki/SD_Gundam_Capsule_Fighter
0       string          \037\213
# to display gzip compressed (strength=100=2*50) before other (strength=50)?
#!:strength * 2
# no FNAME and FCOMMENT bit implies no file name/comment. That means only binary
>3	byte&0x18	=0
# For binary gzipped no ASCII text should occur
#	mcd-monu-cad.trid.xml
>>10	string		MCD			Monu-Cad Drawing, Component or Font
#>>36	string		Created\ with\ MONU-CAD	
#!:mime	application/octet-stream
# http://fileformats.archiveteam.org/wiki/Monu-CAD
#	http://www.monucad.com/downloads/FullDemo-2005.EXE
#	/HANDS96.MCC	Component
#	/DEMO_DD01.MCD	Drawing
#	/MCALF020.FNT	Font
!:ext	mcc/mcd/fnt
# http://www.generalcadd.com
>>10	string		GXD			General CADD, Drawing or Component
#!:mime	application/octet-stream
#	/gxc/BUILDINGEDGE.gxc			Component
#	/gxd/HOCKETT-STPAUL-WRHSE.gxd		Drawing
#	/gxd/POWERLAND-MILL-ADD-11.gxd		Drawing		v9.1.06
!:ext	gxc/gxd
#>>>13	ubyte		0			\b, version 0
>>>13	string		09			\b, version 9
# other gzipped binary like gzipped tar, VirtualBox extension package,...
>>10	default		x		gzip compressed data
!:mime	application/gzip
>>>0	use	gzip-info
# size of the original (uncompressed) input data modulo 2^32
# TODO: check for GXD MCD cad the reported size
>>>-4	ulelong		x		\b, original size modulo 2^32 %u
# gzipped TAR or VirtualBox extension package
#!:mime	application/x-compressed-tar
#!:mime	application/x-virtualbox-vbox-extpack
# https://www.w3.org/TR/SVG/mimereg.html
#!:mime	image/svg+xml-compressed
#	zlib.3.gz
#	microcode-20180312.tgz
#	tpz same as tgz
#	lua-md5_1.2-1_i386_i486.ipk	https://en.wikipedia.org/wiki/Opkg
#	Oracle_VM_VirtualBox_Extension_Pack-5.0.12-104815.vbox-extpack
#	trees.blend			http://fileformats.archiveteam.org/wiki/BLEND
#	2020-07-19-Note-16-24.xoj	https://xournal.sourceforge.net/manual.html
#	MYgnucash-gz.gnucash		https://wiki.gnucash.org/wiki/GnuCash_XML_format
#	text-rotate.dia			https://en.wikipedia.org/wiki/Dia_(software)
#	MYrdata.RData			https://en.wikipedia.org/wiki/R_(programming_language)
!:ext	gz/tgz/tpz/ipk/vbox-extpack/svgz/blend/dia/gnucash/rdata/xoj
# FNAME/FCOMMENT bit implies file name/comment as iso-8859-1 text
>3	byte&0x18	>0		gzip compressed data
!:mime	application/gzip
# gzipped tar, gzipped Abiword document
#!:mime	application/x-compressed-tar
#!:mime	application/x-abiword-compressed
#!:mime	image/image/svg+xml-compressed
#	kleopatra_splashscreen.svgz	gzipped .svg
#	RSI-Mega-Demo_Disk1.adz		gzipped .adf	http://fileformats.archiveteam.org/wiki/ADF_(Amiga)
#	PostbankTest.kmy		gzipped XML	https://docs.kde.org/stable5/en/kmymoney/kmymoney/details.formats.compressed.html
#	Logo.xcfgz			gzipped .xcf	http://fileformats.archiveteam.org/wiki/XCF
!:ext	gz/tgz/tpz/zabw/svgz/adz/kmy/xcfgz
>>0	use	gzip-info
# size of the original (uncompressed) input data modulo 2^32
>>-4	ulelong		x		\b, original size modulo 2^32 %u
#	display information of gzip compressed files
0	name				gzip-info
#>2	byte		x		THIS iS GZIP
>2	byte		<8		\b, reserved method
>2	byte		>8		\b, unknown method
>3	byte		&0x01		\b, ASCII
>3	byte		&0x02		\b, has CRC
>3	byte		&0x04		\b, extra field
>3	byte&0xC	=0x08
>>10	string		x		\b, was "%s"
>3	byte		&0x10		\b, has comment
>3	byte		&0x20		\b, encrypted
>4	ledate		>0		\b, last modified: %s
>8	byte		2		\b, max compression
>8	byte		4		\b, max speed
>9	byte		=0x00		\b, from FAT filesystem (MS-DOS, OS/2, NT)
>9	byte		=0x01		\b, from Amiga
>9	byte		=0x02		\b, from VMS
>9	byte		=0x03		\b, from Unix
>9	byte		=0x04		\b, from VM/CMS
>9	byte		=0x05		\b, from Atari
>9	byte		=0x06		\b, from HPFS filesystem (OS/2, NT)
>9	byte		=0x07		\b, from MacOS
>9	byte		=0x08		\b, from Z-System
>9	byte		=0x09		\b, from CP/M
>9	byte		=0x0A		\b, from TOPS/20
>9	byte		=0x0B		\b, from NTFS filesystem (NT)
>9	byte		=0x0C		\b, from QDOS
>9	byte		=0x0D		\b, from Acorn RISCOS
# size of the original (uncompressed) input data modulo 2^32
#>-4	ulelong		x		\b, original size modulo 2^32 %u
#ERROR: line 114: non zero offset 1048572 at level 1

# packed data, Huffman (minimum redundancy) codes on a byte-by-byte basis
0	string		\037\036	packed data
!:mime	application/octet-stream
!:ext	z
>2	belong		>1		\b, %d characters originally
>2	belong		=1		\b, %d character originally
#
# This magic number is byte-order-independent.
0	short		0x1f1f		old packed data
!:mime	application/octet-stream

# 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
!:mime	application/octet-stream
# 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
!:mime	application/octet-stream
0	short		0145405		huf output
!:mime	application/octet-stream

# bzip2
0	string		BZh		bzip2 compressed data
!:mime	application/x-bzip2
!:ext	bz2
>3	byte		>47		\b, block size = %c00k

# bzip	a block-sorting file compressor
#	by Julian Seward <sewardj@cs.man.ac.uk> and others
0	string		BZ0		bzip compressed data
!:mime	application/x-bzip
>3	byte		>47		\b, block size = %c00k

# lzip
0	string		LZIP		lzip compressed data
!:mime application/x-lzip
!:ext lz
>4	byte		x		\b, version: %d

# 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

# lzop from <markus.oberhumer@jk.uni-linz.ac.at>
0	string		\x89\x4c\x5a\x4f\x00\x0d\x0a\x1a\x0a	lzop compressed data
!:ext	lzo
!:mime	application/x-lzop
>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

# 4.3BSD-Quasijarus Strong Compression
# https://minnie.tuhs.org/Quasijarus/compress.html
0	string		\037\241	Quasijarus strong compressed data

# From: Cory Dikkers <cdikkers@swbell.net>
0	string		XPKF		Amiga xpkf.library compressed data
0	string		PP11		Power Packer 1.1 compressed data
0	string		PP20		Power Packer 2.0 compressed data,
>4	belong		0x09090909	fast compression
>4	belong		0x090A0A0A	mediocre compression
>4	belong		0x090A0B0B	good compression
>4	belong		0x090A0C0C	very good compression
>4	belong		0x090A0C0D	best compression

# 7-zip archiver, from Thomas Klausner (wiz@danbala.tuwien.ac.at)
# https://www.7-zip.org or DOC/7zFormat.txt
#
0	string		7z\274\257\047\034	7-zip archive data,
>6	byte		x			version %d
>7	byte		x			\b.%d
!:mime	application/x-7z-compressed
!:ext 7z/cb7

0	name		lzma			LZMA compressed data,
!:mime	application/x-lzma
!:ext	lzma
>5	lequad		=0xffffffffffffffff	streamed
>5	lequad		!0xffffffffffffffff	non-streamed, size %lld

# Type: LZMA
0	lelong&0xffffff	=0x5d
>12	leshort		0xff
>>0	use		lzma
>12	leshort		0
>>0	use		lzma

# http://tukaani.org/xz/xz-file-format.txt
0	ustring		\xFD7zXZ\x00		XZ compressed data, checksum
!:strength * 2
!:mime	application/x-xz
!:ext	xz
>7	byte&0xf	0x0			NONE
>7	byte&0xf	0x1			CRC32
>7	byte&0xf	0x4			CRC64
>7	byte&0xf	0xa			SHA-256

# https://github.com/ckolivas/lrzip/blob/master/doc/magic.header.txt
0	string		LRZI			LRZIP compressed data
!:mime  application/x-lrzip
>4	byte		x			- version %d
>5	byte		x			\b.%d
>22	byte		1			\b, encrypted

# https://fastcompression.blogspot.fi/2013/04/lz4-streaming-format-final.html
0	lelong		0x184d2204	LZ4 compressed data (v1.4+)
!:mime	application/x-lz4
!:ext	lz4
# Added by osm0sis@xda-developers.com
0 	lelong		0x184c2103	LZ4 compressed data (v1.0-v1.3)
!:mime	application/x-lz4
0	lelong		0x184c2102	LZ4 compressed data (v0.1-v0.9)
!:mime	application/x-lz4

# Zstandard/LZ4 skippable frames
# https://github.com/facebook/zstd/blob/dev/zstd_compression_format.md
0         lelong&0xFFFFFFF0  0x184D2A50
>(4.l+8)  indirect	x

# Zstandard Dictionary ID subroutine
0     name        zstd-dictionary-id
# Single Segment = True
>0    byte        &0x20   \b, Dictionary ID:
>>0   byte&0x03   0       None
>>0   byte&0x03   1
>>>1  byte        x       %u
>>0   byte&0x03   2
>>>1  leshort     x       %u
>>0   byte&0x03   3
>>>1  lelong      x       %u
# Single Segment = False
>0    byte        ^0x20   \b, Dictionary ID:
>>0   byte&0x03   0       None
>>0   byte&0x03   1
>>>2  byte        x       %u
>>0   byte&0x03   2
>>>2  leshort     x       %u
>>0   byte&0x03   3
>>>2  lelong      x       %u

# Zstandard compressed data
# https://github.com/facebook/zstd/blob/dev/zstd_compression_format.md
0     lelong       0xFD2FB522  Zstandard compressed data (v0.2)
!:mime  application/zstd
!:ext zst
0     lelong       0xFD2FB523  Zstandard compressed data (v0.3)
!:mime  application/zstd
!:ext zst
0     lelong       0xFD2FB524  Zstandard compressed data (v0.4)
!:mime  application/zstd
!:ext zst
0     lelong       0xFD2FB525  Zstandard compressed data (v0.5)
!:mime  application/zstd
!:ext zst
0     lelong       0xFD2FB526  Zstandard compressed data (v0.6)
!:mime  application/zstd
!:ext zst
0     lelong       0xFD2FB527  Zstandard compressed data (v0.7)
!:mime  application/zstd
!:ext zst
>4    use          zstd-dictionary-id
0     lelong       0xFD2FB528  Zstandard compressed data (v0.8+)
!:mime  application/zstd
!:ext zst
>4    use          zstd-dictionary-id

# https://github.com/facebook/zstd/blob/dev/zstd_compression_format.md
0  lelong    0xEC30A437  Zstandard dictionary
!:mime  application/x-std-dictionary
>4 lelong    x           (ID %u)

# AFX compressed files (Wolfram Kleff)
2	string		-afx-		AFX compressed file data

# Supplementary magic data for the file(1) command to support
# rzip(1).  The format is described in magic(5).
#
# Copyright (C) 2003 by Andrew Tridgell.  You may do whatever you want with
# this file.
#
0	string		RZIP		rzip compressed data
>4	byte		x		- version %d
>5	byte		x		\b.%d
>6	belong		x		(%d bytes)

0	string		ArC\x01		FreeArc archive <http://freearc.org>

# Valve Pack (VPK) files
# https://developer.valvesoftware.com/wiki/VPK_(file_format)#File_Format
0	lelong	0x55aa1234	Valve Pak file
>0x4	lelong	x		\b, version %u
>0x8	lelong	x		\b, tree size %u 
>0x12	lelong	x		\b, file data size %u 
>0x16	lelong	x		\b, archive MD5 size %u 
>0x20	lelong	x		\b, other MD5 size %u 
>0x24	lelong	x		\b, signature size %u 

# Snappy framing format
# https://code.google.com/p/snappy/source/browse/trunk/framing_format.txt
0	string	\377\006\0\0sNaPpY	snappy framed data
!:mime	application/x-snappy-framed

# qpress, https://www.quicklz.com/
0	string	qpress10	qpress compressed data
!:mime	application/x-qpress

# Zlib https://www.ietf.org/rfc/rfc6713.txt
0	string/b	x
>0	beshort%31	=0
>>0	byte&0xf	=8
>>>0	byte&0x80 	=0	zlib compressed data
!:mime	application/zlib

# BWC compression
0	string		BWC
>3	byte		0	BWC compressed data

# UCL compression
0	bequad		0x00e955434cff011a	UCL compressed data

# Softlib archive
0	string		SLIB	Softlib archive
>4	leshort		x	\b, version %d
>6	leshort		x	(contains %d files)

# URL:  https://github.com/lzfse/lzfse/blob/master/src/lzfse_internal.h#L276
# From: Eric Hall <eric.hall@darkart.com>
0	string	bvx-	lzfse encoded, no compression
0	string	bvx1	lzfse compressed, uncompressed tables
0	string	bvx2	lzfse compressed, compressed tables
0	string	bvxn	lzfse encoded, lzvn compressed

# https://support-docs.illumina.com/SW/ORA_Format_Specification/Content/SW/ORA/ORAFormatSpecification.htm
0	uleshort	0x7c49	
>2	lelong		0x80	ORA FASTQ compressed file
>>6	ulelong		x	\b, DNA size %u
>>10	ulelong		x	\b, read names size %u
>>14	ulelong		x	\b, quality buffer 1 size %u
>>18	ulelong		x	\b, quality buffer 2 size %u
>>22	ulelong		x	\b, sequence buffer size %u
>>26	ulelong		x	\b, N-position buffer size %u
>>30	ulelong		x	\b, crypto buffer size %u
>>34	ulelong		x	\b, misc  buffer 1 size %u
>>38	ulelong		x	\b, misc  buffer 2 size %u
>>42	ulelong		x	\b, flags %#x
>>46	lelong		x	\b, read size %d
>>50	lelong		x	\b, number of reads %d
>>54	leshort		x	\b, version %d

# https://github.com/kspalaiologos/bzip3/blob/master/doc/file_format.md
0	string/b	BZ3v1	bzip3 compressed data
>5	ulelong		x	\b, blocksize %u


# https://support-docs.illumina.com/SW/ORA_Format_Specification/Content/\
# SW/ORA/ORAFormatSpecification.htm
# From Guillaume Rizk
0	short	=0x7C49 DRAGEN ORA file,
>-261	short	=0x7C49 with metadata:
>-125	u8	x	NB reads: %llu,
>-109	u8	x	NB bases: %llu.
>-219	u4&0x02	2	File contains interleaved paired reads

# https://github.com/xamarin/xamarin-android/pull/4686
0	string	XALZ	Xamarin LZ4-compressed assembly
>8	ulelong	x	\b, uncompressed size %u
