A fast, integerized implementation of the OGG Vorbis decoder, capable of running faster than real time on processors such as the Cirrus Logic 7212/7312 is available

That download contains no readme, no attribution, no licensing conditions, and not even a Makefile. It's not merely integerised, it's ARM assembler. Some comments in the source code mention HipZip. All in all I'd steer well clear of this until its provenance is a bit more clear...

Peter