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unalf project README.
The ultimate goal of this project is to reimplement the ALF
compression and decompression algorithms on modern systems aka
Linux and anything else that's POSIX-ish. It's also intended to
be a repository of information about the ALF archiver (and UNALF
dearchiver).
Included in both the source and binary distributions:
- README.txt - you're reading it now.
- TODO.txt - plans for the future.
- doc/Arcinfo - describes the format of ARC compressed files. The ALF
file structure is almost identical to ARC's. This file was taken from
the arc-5.21q source.
- doc/alf14.atr - the distribution disk for ALF version 1.4, as an Atari
8-bit single-density floppy disk image. This likely isn't the original
distribution disk, but it's the only one I've found on the various
archive sites.
- doc/alf14_doc.txt - the documentation for ALF and UNALF, extracted
from the disk image and converted from ATASCII to standard ASCII. Note
that the filenames are different: LZ.COM for ALF14.COM and DZ.COM for
UNALF14.COM.
- doc/fileformat.txt - documents how the ALF file format differs from ARC.
- doc/review.txt - a review of the original ALFCrunch, from an Atari
magazine.
- examples/* - ALF files found in the wild.
Included in the source distribution only:
- BUILD.txt - directions for compiling unalf.
- src/ - the source.
- f65/ - "fake 6502" porting layer. Not for the faint of heart. The
unalf algorithm was ported from a disassembly of the 6502 code,
using a perl script to convert the 6502 mnemonics to C macros.
This means I was able to port the code without fully understanding
how it works...
- testing/alfls - a Perl script that lists the contents of an ALF
archive. Run it with --help for more information. If you're
packaging unalf for a distribution, there's no need to include this
script in the package: I wrote it for testing purposes only. You can
use "unalf -l" to list .alf files, so this is redundant.
- magic/ - "magic" that allows the file(1) command to identify ALF
archive files. See magic/MAGIG.txt for details.
Included in the binary distribution only:
- README_Windows.txt.
- unalf.exe and alfsum.exe - the Windows executables.
- unalf.html and alfsum.html - the man pages, converted to HTML.
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