History rewritten once again...

Apple's fse implementation is based on an open-source work from an individual which predates lzfse by about ~20 months.

https://github.com/Cyan4973/FiniteStateEntropy

It's even less optimized than the original one, due to a few errors that slipped through during lzfse conception.

http://encode.ru/threads/2221-LZFSE-New-Apple-Data-Compressi...