diff options
Diffstat (limited to 'magic/alf')
| -rw-r--r-- | magic/alf | 21 |
1 files changed, 13 insertions, 8 deletions
@@ -1,8 +1,7 @@ ### AlfCrunch -# Author: B. Watson (urchlay@slackware.uk) -# # Reference: # https://slackware.uk/~urchlay/repos/alftools/plain/doc/fileformat.txt +# https://slackware.uk/~urchlay/repos/alftools/plain/doc/compression.txt # # This is very similar to ARC (see Magdir/archive), but doesn't # overlap with it. The . in the filename is always present, even @@ -10,16 +9,22 @@ # # Offsets 18 and 28 are the high bytes of the 32-bit original and # compressed sizes. These will always be 0, since Atari files are -# never >16MB in size (and since the UNALF dearchiver can't handle -# them anyway). +# never >16MB in size (and since LZ.COM and DZ.COM can't create or +# extract them anyway). +# +# Offset 29 is the first byte of the compressed stream. It will always +# be 0x80, because the stream always starts with a 9-bit "reset" code +# (for normal files), or an "end" code (for 0-byte files). Either way, +# the high 8 bits of the code are 0x80. # -# magicbits=53.7 +# magicbits=61.7 # 0 uleshort 0x0f1a >18 ubyte 0x00 >>28 ubyte 0x00 ->>>2 regex/13 [A-Z][A-Z0-9@_]{0,7}\.[A-Z0-9@_]{0,3} ->>>>&0 ubyte 0 ->>>>>2 string x Atari 8-bit AlfCrunch data, first filename %s +>>>29 ubyte 0x80 +>>>>2 regex/13 [A-Z][A-Z0-9@_]{0,7}\.[A-Z0-9@_]{0,3} +>>>>>&0 ubyte 0 +>>>>>>2 string x Atari 8-bit AlfCrunch data, first filename %s !:mime application/x-atari-8bit-alfcrunch !:ext alf |