xref: /freebsd/contrib/file/magic/Magdir/diff (revision ae316d1d1cffd71ab7751f94e10118777a88e027)

#------------------------------------------------------------------------------
# $File: diff,v 1.21 2024/07/13 14:47:09 christos Exp $
# diff:  file(1) magic for diff(1) output
#
# Update:	Joerg Jenderek
# URL: 		https://en.wikipedia.org/wiki/Diff
# Reference:	http://mark0.net/download/triddefs_xml.7z/defs/d/diff.trid.xml
# Note:		called "diff output text" by TrID and
#		"Differences between files" by shared MIME-info database from freedesktop.org
#		According to shared MIME-info database also tabulator character instead of space character and
#		by TrID minus character after space character
0	search/1	diff\040	diff output text
# diff output text (strength=40=40+0) after unified diff output (strength=131=38+93)
#!:strength +0
!:mime	text/x-diff
#!:mime	text/x-patch
!:ext	diff/patch
# no short named pch dif examples found
#!:ext	diff/patch/dif/pch
# URL:		https://en.wikipedia.org/wiki/Diff_utility#Context_format
# Reference:	http://mark0.net/download/triddefs_xml.7z/defs/d/diff-context.trid.xml
# Note:		called "context diff output" by TrID
#		and "Differences between files" by shared MIME-info database from freedesktop.org
0	search/1	***\040
# context diff output text (strength=42=38+4) before
# C source (strength=41,39,37)				exported SGML document (strength=39,28)
!:strength +4
>&0	search/1024	\n---\040	context diff output text
!:mime	text/x-diff
#!:mime	text/x-patch
!:ext	diff/patch
# no short named pch dif examples found
#!:ext	diff/patch/dif/pch
0	search/1	Only\040in\040 	diff output text
# diff output text output text (strength=38=38+0) after unified diff output (strength=131=38+93)
#!:strength +0
!:mime	text/x-diff
#!:mime	text/x-patch
!:ext	diff
0	search/1	Common\040subdirectories:\040 	diff output text
!:mime	text/x-diff

# URL: 		https://en.wikipedia.org/wiki/Diff#Extensions
# Reference:	http://mark0.net/download/triddefs_xml.7z/defs/d/diff-rcs.trid.xml
# Note:		called "RCS/CVS diff output" by TrID
#		and "Differences between files" by shared MIME-info database from freedesktop.org
0	search/1	Index:		RCS/CVS diff output text
# RCS/CVS diff output text (strength=36=36+0) after unified diff output (strength=131=38+93)
#!:strength +0
!:mime	text/x-diff
#!:mime	text/x-patch
!:ext	diff/patch

# bsdiff:  file(1) magic for bsdiff(1) output
# Update:	Joerg Jenderek
# URL: 		http://www.daemonology.net/bsdiff/
# Reference:	https://github.com/cperciva/bsdiff/blob/master/bsdiff-ra/FORMAT
#		http://mark0.net/download/triddefs_xml.7z/defs/b/bsdiff.trid.xml
# Note:		called "bsdiff patch" by TrID and and "BSDIFF" version 4.0 by DROID via PUID fmt/439 and
#		"Binary differences between files" by shared MIME-info database from freedesktop.org
0	string/b	BSDIFF40
# skip DROID fmt-439-signature-id-672.bsdiff with invalid new file segment length 0
>16	long		!0		bsdiff(1) patch file
#!:mime	application/octet-stream
!:mime	application/x-bsdiff
!:ext	bsdiff
# new file length
#>>8	lequad		x		\b, new length %lld
# new file segment length
#>>16	lelong		x		\b, new segment length %d
# compressed header block length
#>>20	lelong		!0		\b, compressed header length %d
# patch data block length
#>>24	lequad		x		\b, data length %lld
# look for bzip data by ./compress after message with 1 space at end
>>0x20	indirect	x		\b, at 0x20

# From:		Joerg Jenderek
# URL:		https://www.chromium.org/developers/design-documents/software-updates-courgette/
# Reference:	https://github.com/adobe/chromium/blob/master/courgette/third_party/bsdiff.h
#		http://mark0.net/download/triddefs_xml.7z/defs/b/bsdiff-chrome.trid.xml
# Note:		called "Courgette Binary Diff output" by TrID
#		the Courgette bsdiff tool use a total different file format compared with BSD variant from Colin Percival
0	string/b	GBSDIF42	Courgette binary diff output
#!:mime	application/octet-stream
!:mime	application/x-patch
!:ext	patch/bsdiff
# slen; length of the file to be patched
#>8	ubelong		x		\b, source length %u
# scrc32; CRC32 of the file to be patched
>12	ubelong		x		\b, crc %#8.8x
# dlen; length of the result file
#>16	ubelong		x		\b, result length %u
# cblen; length of the control block
#>20	ubelong		x		\b, control length %u
# difflen; length of the diff block
#>24	ubelong		x		\b, patch length %u
# extralen; length of the extra block
#>28	ubelong		x		\b, extra length %u

# unified diff
# URL:		http://fileformats.archiveteam.org/wiki/Unified_diff
#		https://en.wikipedia.org/wiki/Diff_utility#Unified_format
# Reference:	https://www.artima.com/weblogs/viewpost.jsp?thread=164293
#		http://mark0.net/download/triddefs_xml.7z/defs/d/diff-unified.trid.xml
# Note:		called "unified diff output" by TrID and
#		"Differences between files" by shared MIME-info database from freedesktop.org
# use b flag to forces the test to be done for binary files (non ASCII text like with Ctrl-D Ctrl-V Ctrl-Z)
0	search/4096/b	---\040
!:strength + 93
>0	use		diff-unified
# most samples are just pure ASCII text like: ShellR64.patch
0	search/11054	---\040
# unified diff (strength=131=38+93) before
# HTML document text (strength=170,90,71,53,52,51,49)	POSIX shell script (fix-qt5.6-build.patch strength=130 ./commands)
# JavaScript source (strength=112,84,81,80,79,78,72,69)	C++ source (strength=71,70,69,68,67,54),
# Python script (strength=69,67,63,60,58,57,56,54,52,37)LaTeX document text (strength=62,56,55,51,43)
# TeX document (strength=51,38)				C source (strength=41,39,37)
# exported SGML document (strength=39,28)		diff output text (strength=38=38+0)
# Pascal source (strength=37)				RCS/CVS diff (strength=36=36+0),
# Algol 68 source (strength=?)				CSV ASCII text (strength=?)
!:strength + 93
>0	use		diff-unified
#	check for 3 characteristic lines of unified diff
0	name			diff-unified
>0	search/11084 	+++\040
>>&0	search/1024 	\n
# at signs line sometimes other (with 2 space chars before) like: indent-header.patch
>>>&0	search/2	@@\040-	unified diff output text
!:mime	text/x-diff
#!:mime	text/x-patch
# https://file-extension.net/seeker/file_extension_dif file_extension_pch file_extension_rej
!:ext	diff/patch/dif/pch/rej
# GRR: mainly for debugging purpose for variants with text before real diff output
>>>>0	string	!---\040
>>>>>0	string		x	\b, 1st line "%s"
>>>>>>&1 string		x	\b, 2nd line "%s"
>>>>>>>&1 string	x	\b, 3rd line "%s"

# librsync -- the library for network deltas
#
# Copyright (C) 2001 by Martin Pool.  You may do whatever you want with
# this file.
#
0	belong		0x72730236	rdiff network-delta data

0	belong		0x72730136	rdiff network-delta signature data
>4	belong		x		(block length=%d,
>8	belong		x		signature strength=%d)