This library can parse all kind of binary-data structures including non-fixed length of structures and nested structures. For generic parsing, loop and condition(if) statement to define structures is provided in this library. Of course, values of neighbor binary-data can be used as the other binary-data's specification of length. Furthermore, this library handles all binary-data under the lazy evaluation. So you can read required parts of a binary-data very quickly even if whole of the binary-data is too big,