#------------------------------------------------------------------------------ # $File: pack,v 1.1 2024/08/30 17:29:28 christos Exp $ # file(1) magic for things that have PACK as magic 0 string PACK # Type: Git pack # From: Adam Buchbinder <adam.buchbinder@gmail.com> # Update: Joerg Jenderek # URL: http://fileformats.archiveteam.org/wiki/Git # reference: https://github.com/git/git/blob/master/Documentation/technical/pack-format.txt # The actual magic is 'PACK', but that clashes with Doom/Quake packs. However, # those have a little-endian offset immediately following the magic 'PACK', # the first byte of which is never 0, while the first byte of the Git pack # version, since it's a tiny number stored in big-endian format, is always 0. # GRR: line above is too general as it matches also PackDir archive ./acorn # test for major version. Git 2017 accepts version number 2 or 3 >4 ubelong <9 # Acorn PackDir with method 0 compression has root like ADFS::HardDisc4.$.AsylumSrc # or SystemDevice::foobar >>9 search/13 :: # but in git binary >>9 default x Git pack !:mime application/x-git !:ext pack # 4 GB limit implies unsigned integer >>>4 ubelong x \b, version %u >>>8 ubelong x \b, %u objects # From: Joerg Jenderek # URL: https://www.kyzer.me.uk/pack/xad/#PackDir # reference: https://www.kyzer.me.uk/pack/xad/xad_PackDir.lha/PackDir.c # GRR: line below is too general as it matches also "Git pack" in ./revision # check for valid compression method 0-4 >5 ulelong <5 # https://www.riscosopen.org/wiki/documentation/show/Introduction%20To%20Filing%20Systems # To skip "Git pack" version 0 test for root directory object like # ADFS::RPC.$.websitezip.FONTFIX >>9 string >ADFS\ PackDir archive (RISC OS) # TrID labels above as "Acorn PackDir compressed Archive" # compression mode y (0 - 4) for GIF LZW with a maximum n bits # (y~n,0~12,1~13,2~14,3~15,4~16) >>>5 ulelong+12 x \b, LZW %u-bits compression # https://www.filebase.org.uk/filetypes # !Packdir compressed archive has three hexadecimal digits code 68E !:mime application/x-acorn-68E !:ext pkd/bin # null terminated root directory object like IDEFS::IDE-4.$.Apps.GRAPHICS.!XFMPdemo >>>9 string x \b, root "%s" # load address 0xFFFtttdd, ttt is the object filetype and dddddddddd is time >>>>&1 ulelong x \b, load address %#x # execution address 0xdddddddd dddddddddd is 40 bit unsigned centiseconds since 1.1.1900 UTC >>>>&5 ulelong x \b, exec address %#x # attributes (bits: 0~owner read,1~owner write,3~no delete,4~public read,5~public write) >>>>&9 ulelong x \b, attributes %#x # number of entries in this directory. for root dir 0 #>>>&13 ulelong x \b, entries %#x # the entries start here with object name >>>>&17 string x \b, 1st object "%s" # Update: Joerg Jenderek # URL: http://fileformats.archiveteam.org/wiki/PAK # reference: https://quakewiki.org/wiki/.pak # GRR: line below is too general as it matches also Acorn PackDir compressed Archive # real Quake examples like pak0.pak have only some hundreds like 150 files # So test for few files >8 ulelong <0x01000000 # in file version 5.32 test for null terminator is only true for # offset ~< FILE_BYTES_MAX = 1 MB defined in ../../src/file.h # look for null terminator of 1st entry name >>(4.l+55) ubyte 0 Quake I or II world or extension !:mime application/x-dzip !:ext pak #>>>8 ulelong x \b, table size %u # dividing this by entry size (64) gives number of files >>>8 ulelong/64 x \b, %u files # offset to the beginning of the file table >>>4 ulelong x \b, offset %#x # 1st file entry >>>(4.l) use pak-entry # 2nd file entry #>>>4 ulelong+64 x \b, offset %#x #>>>(4.l+64) use pak-entry # # display file table entry of Quake PAK archive 0 name pak-entry # normally entry start after header which implies offset 12 or higher >56 ulelong >11 # the offset from the beginning of pak to beginning of this entry file contents >>56 ulelong x at %#x # the size of file for this entry >>60 ulelong x %u bytes # 56 byte null-terminated entry name string includes path like maps/e1m1.bsp >>0 string x '%-.56s' # inspect entry content by jumping to entry offset >>(56) indirect x \b: #0 string -1\x0a Quake I demo #>30 string x version %.4s #>61 string x level %s #0 string 5\x0a Quake I save