A declarative way to read and write binary file formats
http://github.com/dmendel/bindata

BinData is a declarative way to read and write binary file formats.
This means the programmer specifies *what* the format of the binary
data is, and BinData works out *how* to read and write data in this
format.  It is an easier ( and more readable ) alternative to
ruby's #pack and #unpack methods.