How can I map a binary network packet structure to Haskell standard data types (records)? -

i want implement binary protocol (rfc3588, diameter) pure haskell. need know there better way (than e.g. data.binary...) read/write data from/to bytestrings. mapping haskell record bytestring, usual in c# using structlayout attribute (decorator).

haskell not give guarantees memory layout can not cast set of bytes struct - must parse using binary or rather (cereal, attoparsec, etc).

edit: example use of binary, consider:

{-# language derivegeneric #-}  import data.binary import ghc.generics (generic)  data foo = foo int | bar string deriving (eq, ord, show, read, generic)  instance binary foo 

now can encode , decode foo type , bytes.