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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 (for files smaller than 64K, cap compresses 0.05% better on average).
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 1.0.8 6910793 (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
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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