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Member "file-5.35/magic/Magdir/acorn" (19 Oct 2017, 3734 Bytes) of package /linux/misc/file-5.35.tar.gz:


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    1 
    2 #------------------------------------------------------------------------------
    3 # $File: acorn,v 1.6 2017/10/19 16:40:37 christos Exp $
    4 # acorn:  file(1) magic for files found on Acorn systems
    5 #
    6 
    7 # RISC OS Chunk File Format
    8 # From RISC OS Programmer's Reference Manual, Appendix D
    9 # We guess the file type from the type of the first chunk.
   10 0	lelong		0xc3cbc6c5	RISC OS Chunk data
   11 >12	string		OBJ_		\b, AOF object
   12 >12	string		LIB_		\b, ALF library
   13 
   14 # RISC OS AIF, contains "SWI OS_Exit" at offset 16.
   15 16	lelong		0xef000011	RISC OS AIF executable
   16 
   17 # RISC OS Draw files
   18 # From RISC OS Programmer's Reference Manual, Appendix E
   19 0	string 		Draw		RISC OS Draw file data
   20 
   21 # RISC OS new format font files
   22 # From RISC OS Programmer's Reference Manual, Appendix E
   23 0	string		FONT\0		RISC OS outline font data,
   24 >5	byte		x		version %d
   25 0	string		FONT\1		RISC OS 1bpp font data,
   26 >5	byte		x		version %d
   27 0	string		FONT\4		RISC OS 4bpp font data
   28 >5	byte		x		version %d
   29 
   30 # RISC OS Music files
   31 # From RISC OS Programmer's Reference Manual, Appendix E
   32 0	string		Maestro\r	RISC OS music file
   33 >8	byte		x		version %d
   34 
   35 >8	byte		x		type %d
   36 
   37 # Digital Symphony data files
   38 # From: Bernard Jungen (bern8817@euphonynet.be)
   39 0		string	\x02\x01\x13\x13\x13\x01\x0d\x10	Digital Symphony sound sample (RISC OS),
   40 >8		byte	x	version %d,
   41 >9		pstring	x	named "%s",
   42 >(9.b+19)	byte	=0	8-bit logarithmic
   43 >(9.b+19)	byte	=1	LZW-compressed linear
   44 >(9.b+19)	byte	=2	8-bit linear signed
   45 >(9.b+19)	byte	=3	16-bit linear signed
   46 >(9.b+19)	byte	=4	SigmaDelta-compressed linear
   47 >(9.b+19)	byte	=5	SigmaDelta-compressed logarithmic
   48 >(9.b+19)	byte	>5	unknown format
   49 
   50 0	string	\x02\x01\x13\x13\x14\x12\x01\x0b	Digital Symphony song (RISC OS),
   51 >8	byte	x	version %d,
   52 >9	byte	=1	1 voice,
   53 >9	byte	!1	%d voices,
   54 >10	leshort	=1	1 track,
   55 >10	leshort	!1	%d tracks,
   56 >12	leshort	=1	1 pattern
   57 >12	leshort	!1	%d patterns
   58 
   59 0	string	\x02\x01\x13\x13\x10\x14\x12\x0e
   60 >9	byte	=0	Digital Symphony sequence (RISC OS),
   61 >>8	byte	x	version %d,
   62 >>10	byte	=1	1 line,
   63 >>10	byte	!1	%d lines,
   64 >>11	leshort	=1	1 position
   65 >>11	leshort	!1	%d positions
   66 >9	byte	=1	Digital Symphony pattern data (RISC OS),
   67 >>8	byte	x	version %d,
   68 >>10	leshort	=1	1 pattern
   69 >>10	leshort	!1	%d patterns
   70 
   71 # From: Joerg Jenderek
   72 # URL: https://www.kyzer.me.uk/pack/xad/#PackDir
   73 # reference: https://www.kyzer.me.uk/pack/xad/xad_PackDir.lha/PackDir.c
   74 # GRR: line below is too general as it matches also "Git pack" in ./revision
   75 0	string	PACK\0
   76 # check for valid compression method 0-4
   77 >5	ulelong	<5
   78 # https://www.riscosopen.org/wiki/documentation/show/Introduction%20To%20Filing%20Systems
   79 # To skip "Git pack" version 0 test for root directory object like
   80 # ADFS::RPC.$.websitezip.FONTFIX
   81 >>9	string	>ADFS\  PackDir archive (RISC OS)
   82 # TrID labels above as "Acorn PackDir compressed Archive"
   83 # compression mode y (0 - 4) for GIF LZW with a maximum n bits
   84 # (y~n,0~12,1~13,2~14,3~15,4~16)
   85 >>>5	ulelong+12 x	\b, LZW %u-bits compression
   86 # http://www.filebase.org.uk/filetypes
   87 # !Packdir compressed archive has three hexadecimal digits code 68E
   88 !:mime	application/x-acorn-68E
   89 !:ext	pkd/bin
   90 # null terminated root directory object like IDEFS::IDE-4.$.Apps.GRAPHICS.!XFMPdemo
   91 >>>9	string	x	\b, root "%s"
   92 # load address 0xFFFtttdd, ttt is the object filetype and dddddddddd is time
   93 >>>>&1	ulelong	x	\b, load address 0x%x
   94 # execution address 0xdddddddd dddddddddd is 40 bit unsigned centiseconds since 1.1.1900 UTC
   95 >>>>&5	ulelong	x	\b, exec address 0x%x
   96 # attributes (bits: 0~owner read,1~owner write,3~no delete,4~public read,5~public write)
   97 >>>>&9	ulelong	x	\b, attributes 0x%x 
   98 # number of entries in this directory. for root dir 0
   99 #>>>&13	ulelong	x	\b, entries 0x%x 
  100 # the entries start here with object name
  101 >>>>&17	string	x	\b, 1st object "%s"
  102