System.IO.Streams.Binary

Use binary to encode/decode io-streams.

single element encode/decode

getFromStream :: Get a -> InputStream ByteString -> IO (Maybe a)

Take a Get and an InputStream and decode a value. Consumes only as much input as necessary to decode the value. Unconsumed input will be unread. If there is an error while deserializing, a DecodeException is thrown, and unconsumed part will be unread. binary decoder use Nothing to indicate input end, so EOFs/Nothing will close a binary decoder. Examples:

>>> import qualified System.IO.Streams as Streams
>>> getFromStream (get :: Get String) =<< Streams.fromLazyByteString (Data.ByteString.Lazy.drop 1 $ runPut $ put "encode me")
*** Exception: System.IO.Streams.Binary: binary decode exception: offset 16, "not enough bytes"

decodeFromStream :: Binary a => InputStream ByteString -> IO (Maybe a)

typeclass version of getFromStream

putToStream :: Binary a => Maybe a -> OutputStream ByteString -> IO ()

Write an instance of Binary to an OutputStream.

InputStream encode/decode

getInputStream :: Get a -> InputStream ByteString -> IO (InputStream a)

Convert a stream of individual encoded ByteStrings to a stream of Results. Throws a DecodeException on error.

decodeInputStream :: Binary a => InputStream ByteString -> IO (InputStream a)

typeclass version of getInputStream

OutputStream encode

putOutputStream :: (a -> Put) -> OutputStream ByteString -> IO (OutputStream a)

create an OutputStream of serializable values from an OutputStream of bytestrings with a Putter.

encodeOutputStream :: Binary a => OutputStream ByteString -> IO (OutputStream a)

typeclass version of putOutputStream

exception type

data DecodeException

An Exception raised when binary decoding fails.

it contains offset information where cereal don't.

Constructors

DecodeException ByteString ByteOffset String

Instances

Show DecodeException

Exception DecodeException