fastpack is intended to be a tool which can pack files into a single archive where each files is compressed and encrypted independently. The idea is that single files can be extracted without dealing with the complete archive.
This design also makes it possible to use different compression and encryption types in each file.
BIG WARNING NOTE
This is also partially just an experiement with Go. It is my first attempt at anything with the language, and code is being written in what inevitably will become the 'What was I thinking' phase.
Initially I am using the snappy compression algorithm and the encryption method has not been decided at this time.