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#------------------------------------------------------------------------------
# $File: acorn,v 1.5 2009/09/19 16:28:07 christos Exp $
# acorn: file(1) magic for files found on Acorn systems
#
# RISC OS Chunk File Format
# From RISC OS Programmer's Reference Manual, Appendix D
# We guess the file type from the type of the first chunk.
0 lelong 0xc3cbc6c5 RISC OS Chunk data
>12 string OBJ_ \b, AOF object
>12 string LIB_ \b, ALF library
# RISC OS AIF, contains "SWI OS_Exit" at offset 16.
16 lelong 0xef000011 RISC OS AIF executable
# RISC OS Draw files
# From RISC OS Programmer's Reference Manual, Appendix E
0 string Draw RISC OS Draw file data
# RISC OS new format font files
# From RISC OS Programmer's Reference Manual, Appendix E
0 string FONT\0 RISC OS outline font data,
>5 byte x version %d
0 string FONT\1 RISC OS 1bpp font data,
>5 byte x version %d
0 string FONT\4 RISC OS 4bpp font data
>5 byte x version %d
# RISC OS Music files
# From RISC OS Programmer's Reference Manual, Appendix E
0 string Maestro\r RISC OS music file
>8 byte x version %d
>8 byte x type %d
# Digital Symphony data files
# From: Bernard Jungen (bern8817@euphonynet.be)
0 string \x02\x01\x13\x13\x13\x01\x0d\x10 Digital Symphony sound sample (RISC OS),
>8 byte x version %d,
>9 pstring x named "%s",
>(9.b+19) byte =0 8-bit logarithmic
>(9.b+19) byte =1 LZW-compressed linear
>(9.b+19) byte =2 8-bit linear signed
>(9.b+19) byte =3 16-bit linear signed
>(9.b+19) byte =4 SigmaDelta-compressed linear
>(9.b+19) byte =5 SigmaDelta-compressed logarithmic
>(9.b+19) byte >5 unknown format
0 string \x02\x01\x13\x13\x14\x12\x01\x0b Digital Symphony song (RISC OS),
>8 byte x version %d,
>9 byte =1 1 voice,
>9 byte !1 %d voices,
>10 leshort =1 1 track,
>10 leshort !1 %d tracks,
>12 leshort =1 1 pattern
>12 leshort !1 %d patterns
0 string \x02\x01\x13\x13\x10\x14\x12\x0e
>9 byte =0 Digital Symphony sequence (RISC OS),
>>8 byte x version %d,
>>10 byte =1 1 line,
>>10 byte !1 %d lines,
>>11 leshort =1 1 position
>>11 leshort !1 %d positions
>9 byte =1 Digital Symphony pattern data (RISC OS),
>>8 byte x version %d,
>>10 leshort =1 1 pattern
>>10 leshort !1 %d patterns
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