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Subject: Re: Bzip2 chess databases

Author: Ratko V Tomic

Date: 14:45:22 02/11/02

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> Since bzip2 comes with full source code, it should be pretty
> easy.  Just include the decompressor and concatenate the
> compressed data to the binary.


The bzip2 offers about 30-50% better compression ratios (on color
graphics) compared to gzip. But the public source implementation
yields very uneven compression times, going from half the speed
of gzip/zlib (at best) to 20 (and up) times slower for the
"wrong" data. To make it work in real time one needs to
pre-filter the data fed the bzip library so that its input
has as few repeated character runs as possible. With such
pre-filtering it works quite well.



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