accurate-kosinski

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This is a library for compressing and decompressing files in Sega's "Kosinski" format (an LZSS variant). The goal is to produce a compressor that outputs data identical to Sega's own compressor. Moduled Kosinski is also supported.

https://segaretro.org/Kosinski_compression

Included are basic frontends for a compressor, a decompressor, and a comparison utility.

Sega's compressor had a fair few bugs, causing it to produce files with a sub-optimal compression ratio. Lucky, none of these issues harm the integrity of the compressed data. See lib/kosinski-compress.c for more info.