ghc-binary-0.5.0.2: Binary serialisation for Haskell values using lazy ByteStringsSource codeContentsIndex
Data.Binary.Get
Portabilityportable to Hugs and GHC.
Stabilityexperimental
MaintainerLennart Kolmodin <kolmodin@dtek.chalmers.se>
Contents
The Get type
Parsing
Utility
Parsing particular types
ByteStrings
Big-endian reads
Little-endian reads
Host-endian, unaligned reads
Description
The Get monad. A monad for efficiently building structures from encoded lazy ByteStrings
Synopsis
data Get a
runGet :: Get a -> ByteString -> a
runGetState :: Get a -> ByteString -> Int64 -> (a, ByteString, Int64)
skip :: Int -> Get ()
uncheckedSkip :: Int64 -> Get ()
lookAhead :: Get a -> Get a
lookAheadM :: Get (Maybe a) -> Get (Maybe a)
lookAheadE :: Get (Either a b) -> Get (Either a b)
uncheckedLookAhead :: Int64 -> Get ByteString
bytesRead :: Get Int64
getBytes :: Int -> Get ByteString
remaining :: Get Int64
isEmpty :: Get Bool
getWord8 :: Get Word8
getByteString :: Int -> Get ByteString
getLazyByteString :: Int64 -> Get ByteString
getLazyByteStringNul :: Get ByteString
getRemainingLazyByteString :: Get ByteString
getWord16be :: Get Word16
getWord32be :: Get Word32
getWord64be :: Get Word64
getWord16le :: Get Word16
getWord32le :: Get Word32
getWord64le :: Get Word64
getWordhost :: Get Word
getWord16host :: Get Word16
getWord32host :: Get Word32
getWord64host :: Get Word64
The Get type
data Get a Source
The Get monad is just a State monad carrying around the input ByteString We treat it as a strict state monad.
show/hide Instances
runGet :: Get a -> ByteString -> aSource
Run the Get monad applies a get-based parser on the input ByteString
runGetState :: Get a -> ByteString -> Int64 -> (a, ByteString, Int64)Source
Run the Get monad applies a get-based parser on the input ByteString. Additional to the result of get it returns the number of consumed bytes and the rest of the input.
Parsing
skip :: Int -> Get ()Source
Skip ahead n bytes. Fails if fewer than n bytes are available.
uncheckedSkip :: Int64 -> Get ()Source
Skip ahead n bytes. No error if there isn't enough bytes.
lookAhead :: Get a -> Get aSource
Run ga, but return without consuming its input. Fails if ga fails.
lookAheadM :: Get (Maybe a) -> Get (Maybe a)Source
Like lookAhead, but consume the input if gma returns 'Just _'. Fails if gma fails.
lookAheadE :: Get (Either a b) -> Get (Either a b)Source
Like lookAhead, but consume the input if gea returns 'Right _'. Fails if gea fails.
uncheckedLookAhead :: Int64 -> Get ByteStringSource
Get the next up to n bytes as a lazy ByteString, without consuming them.
Utility
bytesRead :: Get Int64Source
Get the total number of bytes read to this point.
getBytes :: Int -> Get ByteStringSource

Pull n bytes from the input, as a strict ByteString.

important

remaining :: Get Int64Source
Get the number of remaining unparsed bytes. Useful for checking whether all input has been consumed. Note that this forces the rest of the input.
isEmpty :: Get BoolSource
Test whether all input has been consumed, i.e. there are no remaining unparsed bytes.
Parsing particular types
getWord8 :: Get Word8Source
Read a Word8 from the monad state
ByteStrings
getByteString :: Int -> Get ByteStringSource
An efficient get method for strict ByteStrings. Fails if fewer than n bytes are left in the input.
getLazyByteString :: Int64 -> Get ByteStringSource
An efficient get method for lazy ByteStrings. Does not fail if fewer than n bytes are left in the input.
getLazyByteStringNul :: Get ByteStringSource
Get a lazy ByteString that is terminated with a NUL byte. Fails if it reaches the end of input without hitting a NUL.
getRemainingLazyByteString :: Get ByteStringSource
Get the remaining bytes as a lazy ByteString
Big-endian reads
getWord16be :: Get Word16Source
Read a Word16 in big endian format
getWord32be :: Get Word32Source
Read a Word32 in big endian format
getWord64be :: Get Word64Source
Read a Word64 in big endian format
Little-endian reads
getWord16le :: Get Word16Source
Read a Word16 in little endian format
getWord32le :: Get Word32Source
Read a Word32 in little endian format
getWord64le :: Get Word64Source
Read a Word64 in little endian format
Host-endian, unaligned reads
getWordhost :: Get WordSource
O(1). Read a single native machine word. The word is read in host order, host endian form, for the machine you're on. On a 64 bit machine the Word is an 8 byte value, on a 32 bit machine, 4 bytes.
getWord16host :: Get Word16Source
O(1). Read a 2 byte Word16 in native host order and host endianness.
getWord32host :: Get Word32Source
O(1). Read a Word32 in native host order and host endianness.
getWord64host :: Get Word64Source
O(1). Read a Word64 in native host order and host endianess.
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