vcdiff

https://github.com/romanbsd/vcdiff

An encoder and decoder for the format described in RFC 3284: "The VCDIFF Generic Differencing and Compression Data Format." The encoding strategy is largely based on Bentley-McIlroy 99: "Data Compression Using Long Common Strings. This is a wrapper aroung Google's open-vcdiff library. For more details visit: http://code.google.com/p/open-vcdiff