Java port of FiniteStateEntropy project in GitHub (https://github.com/Cyan4973/FiniteStateEntropy)
From the upstream project...
FSE is a new kind of Entropy encoder, based on ANS theory, from Jarek Duda, achieving precise compression accuracy (like Arithmetic coding) at much higher speeds.
This is a very specific port, though - it provides support for compressing/decompressing Java shorts, and assumes a fixed, pre-calculated table for compression & decompression.