| Copyright | Lennart Kolmodin Galois Inc. 2009 |
|---|---|
| License | BSD3-style (see LICENSE) |
| Maintainer | Trevor Elliott <trevor@galois.com> |
| Stability | |
| Portability | |
| Safe Haskell | Safe-Inferred |
| Language | Haskell2010 |
Data.Serialize.Get
Description
The Get monad. A monad for efficiently building structures from strict ByteStrings
Synopsis
- data Get a
- runGet :: Get a -> ByteString -> Either String a
- runGetLazy :: Get a -> ByteString -> Either String a
- runGetState :: Get a -> ByteString -> Int -> Either String (a, ByteString)
- runGetLazyState :: Get a -> ByteString -> Either String (a, ByteString)
- data Result r
- runGetPartial :: Get a -> ByteString -> Result a
- runGetChunk :: Get a -> Maybe Int -> ByteString -> Result a
- ensure :: Int -> Get ByteString
- isolate :: Int -> Get a -> Get a
- label :: String -> Get a -> Get a
- skip :: Int -> Get ()
- uncheckedSkip :: Int -> Get ()
- lookAhead :: Get a -> Get a
- lookAheadM :: Get (Maybe a) -> Get (Maybe a)
- lookAheadE :: Get (Either a b) -> Get (Either a b)
- uncheckedLookAhead :: Int -> Get ByteString
- bytesRead :: Get Int
- getBytes :: Int -> Get ByteString
- remaining :: Get Int
- isEmpty :: Get Bool
- getWord8 :: Get Word8
- getInt8 :: Get Int8
- getByteString :: Int -> Get ByteString
- getLazyByteString :: Int64 -> Get ByteString
- getShortByteString :: Int -> Get ShortByteString
- getWord16be :: Get Word16
- getWord32be :: Get Word32
- getWord64be :: Get Word64
- getInt16be :: Get Int16
- getInt32be :: Get Int32
- getInt64be :: Get Int64
- getWord16le :: Get Word16
- getWord32le :: Get Word32
- getWord64le :: Get Word64
- getInt16le :: Get Int16
- getInt32le :: Get Int32
- getInt64le :: Get Int64
- getWordhost :: Get Word
- getWord16host :: Get Word16
- getWord32host :: Get Word32
- getWord64host :: Get Word64
- getTwoOf :: Get a -> Get b -> Get (a, b)
- getListOf :: Get a -> Get [a]
- getIArrayOf :: (Ix i, IArray a e) => Get i -> Get e -> Get (a i e)
- getTreeOf :: Get a -> Get (Tree a)
- getSeqOf :: Get a -> Get (Seq a)
- getMapOf :: Ord k => Get k -> Get a -> Get (Map k a)
- getIntMapOf :: Get Int -> Get a -> Get (IntMap a)
- getSetOf :: Ord a => Get a -> Get (Set a)
- getIntSetOf :: Get Int -> Get IntSet
- getMaybeOf :: Get a -> Get (Maybe a)
- getEitherOf :: Get a -> Get b -> Get (Either a b)
- getNested :: Get Int -> Get a -> Get a
The Get type
The Get monad is an Exception and State monad.
runGet :: Get a -> ByteString -> Either String a Source #
Run the Get monad applies a get-based parser on the input ByteString
runGetLazy :: Get a -> ByteString -> Either String a Source #
Run the Get monad over a Lazy ByteString. Note that this will not run the Get parser lazily, but will operate on lazy ByteStrings.
runGetState :: Get a -> ByteString -> Int -> Either String (a, ByteString) Source #
Run the Get monad applies a get-based parser on the input
ByteString, starting at the specified offset. In addition to the result of get
it returns the rest of the input.
runGetLazyState :: Get a -> ByteString -> Either String (a, ByteString) Source #
Run the Get monad over a Lazy ByteString. Note that this does not run the Get parser lazily, but will operate on lazy ByteStrings.
Incremental interface
The result of a parse.
Constructors
| Fail String ByteString | The parse failed. The |
| Partial (ByteString -> Result r) | Supply this continuation with more input so that
the parser can resume. To indicate that no more
input is available, use an |
| Done r ByteString | The parse succeeded. The |
runGetPartial :: Get a -> ByteString -> Result a Source #
Run the Get monad applies a get-based parser on the input ByteString
runGetChunk :: Get a -> Maybe Int -> ByteString -> Result a Source #
Run the get monad on a single chunk, providing an optional length for the remaining, unseen input, with Nothing indicating that it's not clear how much input is left. For example, with a lazy ByteString, the optional length represents the sum of the lengths of all remaining chunks.
Parsing
ensure :: Int -> Get ByteString Source #
If at least n bytes of input are available, return the current
input, otherwise fail.
isolate :: Int -> Get a -> Get a Source #
Isolate an action to operating within a fixed block of bytes. The action is required to consume all the bytes that it is isolated to.
uncheckedSkip :: Int -> Get () Source #
Skip ahead up to n bytes in the current chunk. No error if there aren't
enough bytes, or if less than n bytes are skipped.
lookAhead :: Get a -> Get a Source #
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 :: Int -> Get ByteString Source #
Get the next up to n bytes as a ByteString until end of this chunk,
without consuming them.
Utility
Get the number of remaining unparsed bytes. Useful for checking whether all input has been consumed.
WARNING: when run with runGetPartial, remaining will only return the number
of bytes that are remaining in the current input.
Test whether all input has been consumed.
WARNING: when run with runGetPartial, isEmpty will only tell you if you're
at the end of the current chunk.
Parsing particular types
ByteStrings
getByteString :: Int -> Get ByteString Source #
An efficient get method for strict ByteStrings. Fails if fewer
than n bytes are left in the input. This function creates a fresh
copy of the underlying bytes.
getLazyByteString :: Int64 -> Get ByteString Source #
getShortByteString :: Int -> Get ShortByteString Source #
Big-endian reads
getWord16be :: Get Word16 Source #
Read a Word16 in big endian format
getWord32be :: Get Word32 Source #
Read a Word32 in big endian format
getWord64be :: Get Word64 Source #
Read a Word64 in big endian format
getInt16be :: Get Int16 Source #
Read a Int16 in big endian format
getInt32be :: Get Int32 Source #
Read a Int32 in big endian format
getInt64be :: Get Int64 Source #
Read a Int64 in big endian format
Little-endian reads
getWord16le :: Get Word16 Source #
Read a Word16 in little endian format
getWord32le :: Get Word32 Source #
Read a Word32 in little endian format
getWord64le :: Get Word64 Source #
Read a Word64 in little endian format
getInt16le :: Get Int16 Source #
Read a Int16 in little endian format
getInt32le :: Get Int32 Source #
Read a Int32 in little endian format
getInt64le :: Get Int64 Source #
Read a Int64 in little endian format
Host-endian, unaligned reads
getWordhost :: Get Word Source #
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 Word16 Source #
O(1). Read a 2 byte Word16 in native host order and host endianness.
getWord32host :: Get Word32 Source #
O(1). Read a Word32 in native host order and host endianness.
getWord64host :: Get Word64 Source #
O(1). Read a Word64 in native host order and host endianness.
Containers
getListOf :: Get a -> Get [a] Source #
Get a list in the following format: Word64 (big endian format) element 1 ... element n
getIArrayOf :: (Ix i, IArray a e) => Get i -> Get e -> Get (a i e) Source #
Get an IArray in the following format: index (lower bound) index (upper bound) Word64 (big endian format) element 1 ... element n
getSeqOf :: Get a -> Get (Seq a) Source #
Get a sequence in the following format: Word64 (big endian format) element 1 ... element n
getMapOf :: Ord k => Get k -> Get a -> Get (Map k a) Source #
Read as a list of pairs of key and element.
getIntMapOf :: Get Int -> Get a -> Get (IntMap a) Source #
Read as a list of pairs of int and element.
getIntSetOf :: Get Int -> Get IntSet Source #
Read as a list of ints.
getMaybeOf :: Get a -> Get (Maybe a) Source #
Read in a Maybe in the following format: Word8 (0 for Nothing, anything else for Just) element (when Just)