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#------------------------------------------------------------------------------
# $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)
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