Rollsum32Base decouples the rollsum algorithm from the implementation of hash.Hash and the storage the rolling checksum window this allows us to write different versions of the storage for the distinctly different use-cases and optimize the storage with the usage pattern.

Rollsum32 is a rolling checksum implemenation inspired by rsync, but with 32bit internal values Create one using NewRollsum32.

The specification of hash.Hash is such that it cannot be implemented without implementing storage but the most optimal storage scheme depends on usage of the circular buffer & hash.