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apultra -- a new, opensource optimal compressor for the apLib format
====================================================================
apultra is a command-line tool and a library that compresses bitstreams in the apLib format.
The tool produces files that are 5 to 7% smaller on average than appack, the apLib compressor. Unlike the similar [cap](https://github.com/svendahl/cap) compressor, apultra can compress files larger than 64K.
apultra is written in portable C. It is fully open-source under a liberal license. You can continue to use the regular apLib decompression libraries for your target environment. You can do whatever you like with it.
Example compression with vmlinux-5.3.0-1-amd64
original 27923676 (100,00%)
appack 7370129 (26,39%)
gzip 1.8 7166179 (25,66%)
apultra 1.3.5 6910729 (24,75%)
The output is fully compatible with the original [aPLib](http://ibsensoftware.com/products_aPLib.html) by Jørgen Ibsen.
Inspirations:
* [cap](https://github.com/svendahl/cap) by Sven-Åke Dahl.
* [Charles Bloom](http://cbloomrants.blogspot.com/)'s compression blog.
* [LZ4](https://github.com/lz4/lz4) by Yann Collet.
* spke for help and support
Some projects that use apultra for compression:
* [Brick Rick](https://www.usebox.net/jjm/brick-rick/), a new game for the Amstrad CPC 464/6128 by usebox.net. A physical copy can be ordered from [Polyplay](https://www.polyplay.xyz/navi.php?suche=Brick+Rick&lang=eng)
* [Kitsune's Curse](https://www.usebox.net/jjm/kitsunes-curse/), another new title for the CPC line by usebox.net.
* [Sgt. Helmet's Training Day](https://www.mojontwins.com/juegos_mojonos/sgt-helmet-training-day-2020-cpc/), a new game for the Amstrad CPC by the Mojon Twins (using their MK1 engine).
* [Prince Dastan - Sokoban Within](https://www.pouet.net/prod.php?which=87382), a CPCRetroDev 2020 game for the Amstrad CPC by Euphoria Design
* [Petris](https://github.com/bbbbbr/Petris), a homebrew game for the Gameboy.
* [Mr Palot](https://github.com/graelx/mrpalot), a ZX Spectrum game made with the Mojon Twins MK1 engine.
* [rasm](https://github.com/EdouardBERGE/rasm), a popular Z80 assembler, features built-in support for apultra-compressed data sections.
Also of interest:
* [oapack](https://gitlab.com/eugene77/oapack) by Eugene Larchenko, a brute-force (exhaustive) optimal packer for the aPLib format.
* [i8080 decompressors](https://gitlab.com/ivagor/unapack) for aPLib by Ivan Gorodetsky
* [Gameboy decompressor](https://github.com/untoxa/UnaPACK.GBZ80) by untoxa
License:
* The apultra code is available under the Zlib license.
* The match finder (matchfinder.c) is available under the CC0 license due to using portions of code from Eric Bigger's Wimlib in the suffix array-based matchfinder.
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