DataScript is a language to describe and manipulate binary data formats as types
Edit by : DataScript consists of two components: a constraint-based specification language that uses DataScript types to describe the physical layout of data and a language binding that provides a simple programming interface to script binary data. A DataScript compiler generates libraries that are linked with DataScript scripts. In short, DataScript is a YACC/lex for arbitrary binary data. you can free download DataScript 0.1 now.