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master
magic/Magdir/diff
149 строк
6 KB
Christos Zoulas
Fix Courgette binary diff misidentified as Nintendo Gameboy Music/Audio
13 июл 2024, 17:47
13 июл 2024, 17:47
f1fdfab
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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)