diff --git a/lib/hs/src/Thrift/Arbitraries.hs b/lib/hs/src/Thrift/Arbitraries.hs
new file mode 100644
index 0000000..3a60ed2
--- /dev/null
+++ b/lib/hs/src/Thrift/Arbitraries.hs
@@ -0,0 +1,61 @@
+{-# OPTIONS_GHC -fno-warn-orphans #-}
+
+module Thrift.Arbitraries where
+
+import Data.Bits()
+
+import Test.QuickCheck.Arbitrary
+
+import Control.Applicative ((<$>))
+import Data.Map (Map)
+import qualified Data.Map as Map
+import qualified Data.Set as Set
+import qualified Data.Vector as Vector
+import qualified Data.Text.Lazy as Text
+import qualified Data.HashSet as HSet
+import qualified Data.HashMap.Strict as HMap
+import Data.Hashable (Hashable)
+
+import Data.ByteString.Lazy (ByteString)
+import qualified Data.ByteString.Lazy as BS
+
+-- String has an Arbitrary instance already
+-- Bool has an Arbitrary instance already
+-- A Thrift 'list' is a Vector.
+
+instance Arbitrary ByteString where
+  arbitrary = BS.pack . filter (/= 0) <$> arbitrary
+
+instance (Ord k, Arbitrary k, Arbitrary v) => Arbitrary (Map k v) where
+  arbitrary = Map.fromList <$> arbitrary
+
+instance (Ord k, Arbitrary k) => Arbitrary (Set.Set k) where
+  arbitrary = Set.fromList <$> arbitrary
+
+instance (Arbitrary k) => Arbitrary (Vector.Vector k) where
+  arbitrary = Vector.fromList <$> arbitrary
+
+instance Arbitrary Text.Text where
+  arbitrary = Text.pack . filter (/= '\0') <$> arbitrary
+
+instance (Eq k, Hashable k, Arbitrary k) => Arbitrary (HSet.HashSet k) where
+  arbitrary = HSet.fromList <$> arbitrary
+
+instance (Eq k, Hashable k, Arbitrary k, Arbitrary v) =>
+    Arbitrary (HMap.HashMap k v) where
+  arbitrary = HMap.fromList <$> arbitrary
+
+{-
+   To handle Thrift 'enum' we would ideally use something like:
+
+instance (Enum a, Bounded a) => Arbitrary a
+    where arbitrary = elements (enumFromTo minBound maxBound)
+
+Unfortunately this doesn't play nicely with the type system.
+Instead we'll generate an arbitrary instance along with the code.
+-}
+
+{-
+    There might be some way to introspect on the Haskell structure of a
+    Thrift 'struct' or 'exception' but generating the code directly is simpler.
+-}
diff --git a/lib/hs/src/Thrift/Protocol.hs b/lib/hs/src/Thrift/Protocol.hs
index 6068d16..ea58642 100644
--- a/lib/hs/src/Thrift/Protocol.hs
+++ b/lib/hs/src/Thrift/Protocol.hs
@@ -1,4 +1,6 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE DeriveDataTypeable #-}
+{-# LANGUAGE OverloadedStrings #-}
 --
 -- Licensed to the Apache Software Foundation (ASF) under one
 -- or more contributor license agreements. See the NOTICE file
@@ -20,167 +22,58 @@
 
 module Thrift.Protocol
     ( Protocol(..)
-    , skip
-    , MessageType(..)
-    , ThriftType(..)
     , ProtocolExn(..)
     , ProtocolExnType(..)
+    , getTypeOf
+    , runParser
+    , versionMask
+    , version1
+    , bsToDouble
     ) where
 
-import Control.Monad ( replicateM_, unless )
 import Control.Exception
-import Data.ByteString.Lazy
+import Data.Attoparsec.ByteString
+import Data.Bits
+import Data.ByteString.Lazy (ByteString, toStrict)
+import Data.ByteString.Unsafe
+import Data.Functor ((<$>))
 import Data.Int
-import Data.Text.Lazy ( Text )
-import Data.Typeable ( Typeable )
+import Data.Monoid (mempty)
+import Data.Text.Lazy (Text)
+import Data.Typeable (Typeable)
+import Data.Word
+import Foreign.Ptr (castPtr)
+import Foreign.Storable (Storable, peek, poke)
+import System.IO.Unsafe
+import qualified Data.ByteString as BS
+import qualified Data.HashMap.Strict as Map
 
+import Thrift.Types
 import Thrift.Transport
 
+versionMask :: Int32
+versionMask = fromIntegral (0xffff0000 :: Word32)
 
-data ThriftType
-    = T_STOP
-    | T_VOID
-    | T_BOOL
-    | T_BYTE
-    | T_DOUBLE
-    | T_I16
-    | T_I32
-    | T_I64
-    | T_STRING
-    | T_STRUCT
-    | T_MAP
-    | T_SET
-    | T_LIST
-      deriving ( Eq )
-
-instance Enum ThriftType where
-    fromEnum T_STOP   = 0
-    fromEnum T_VOID   = 1
-    fromEnum T_BOOL   = 2
-    fromEnum T_BYTE   = 3
-    fromEnum T_DOUBLE = 4
-    fromEnum T_I16    = 6
-    fromEnum T_I32    = 8
-    fromEnum T_I64    = 10
-    fromEnum T_STRING = 11
-    fromEnum T_STRUCT = 12
-    fromEnum T_MAP    = 13
-    fromEnum T_SET    = 14
-    fromEnum T_LIST   = 15
-
-    toEnum 0  = T_STOP
-    toEnum 1  = T_VOID
-    toEnum 2  = T_BOOL
-    toEnum 3  = T_BYTE
-    toEnum 4  = T_DOUBLE
-    toEnum 6  = T_I16
-    toEnum 8  = T_I32
-    toEnum 10 = T_I64
-    toEnum 11 = T_STRING
-    toEnum 12 = T_STRUCT
-    toEnum 13 = T_MAP
-    toEnum 14 = T_SET
-    toEnum 15 = T_LIST
-    toEnum t = error $ "Invalid ThriftType " ++ show t
-
-data MessageType
-    = M_CALL
-    | M_REPLY
-    | M_EXCEPTION
-      deriving ( Eq )
-
-instance Enum MessageType where
-    fromEnum M_CALL      =  1
-    fromEnum M_REPLY     =  2
-    fromEnum M_EXCEPTION =  3
-
-    toEnum 1 = M_CALL
-    toEnum 2 = M_REPLY
-    toEnum 3 = M_EXCEPTION
-    toEnum t = error $ "Invalid MessageType " ++ show t
-
+version1 :: Int32
+version1 = fromIntegral (0x80010000 :: Word32)
 
 class Protocol a where
-    getTransport :: Transport t => a t -> t
+  getTransport :: Transport t => a t -> t
 
-    writeMessageBegin :: Transport t => a t -> (Text, MessageType, Int32) -> IO ()
-    writeMessageEnd   :: Transport t => a t -> IO ()
+  writeMessageBegin :: Transport t => a t -> (Text, MessageType, Int32) -> IO ()
+  writeMessageEnd :: Transport t => a t -> IO ()
+  writeMessageEnd _ = return ()
+  
+  readMessageBegin :: Transport t => a t -> IO (Text, MessageType, Int32)
+  readMessageEnd :: Transport t => a t -> IO ()
+  readMessageEnd _ = return ()
 
-    writeStructBegin :: Transport t => a t -> Text -> IO ()
-    writeStructEnd   :: Transport t => a t -> IO ()
-    writeFieldBegin  :: Transport t => a t -> (Text, ThriftType, Int16) -> IO ()
-    writeFieldEnd    :: Transport t => a t -> IO ()
-    writeFieldStop   :: Transport t => a t -> IO ()
-    writeMapBegin    :: Transport t => a t -> (ThriftType, ThriftType, Int32) -> IO ()
-    writeMapEnd      :: Transport t => a t -> IO ()
-    writeListBegin   :: Transport t => a t -> (ThriftType, Int32) -> IO ()
-    writeListEnd     :: Transport t => a t -> IO ()
-    writeSetBegin    :: Transport t => a t -> (ThriftType, Int32) -> IO ()
-    writeSetEnd      :: Transport t => a t -> IO ()
+  serializeVal :: Transport t => a t -> ThriftVal -> ByteString
+  deserializeVal :: Transport t => a t -> ThriftType -> ByteString -> ThriftVal
 
-    writeBool   :: Transport t => a t -> Bool -> IO ()
-    writeByte   :: Transport t => a t -> Int8 -> IO ()
-    writeI16    :: Transport t => a t -> Int16 -> IO ()
-    writeI32    :: Transport t => a t -> Int32 -> IO ()
-    writeI64    :: Transport t => a t -> Int64 -> IO ()
-    writeDouble :: Transport t => a t -> Double -> IO ()
-    writeString :: Transport t => a t -> Text -> IO ()
-    writeBinary :: Transport t => a t -> ByteString -> IO ()
-
-
-    readMessageBegin :: Transport t => a t -> IO (Text, MessageType, Int32)
-    readMessageEnd   :: Transport t => a t -> IO ()
-
-    readStructBegin :: Transport t => a t -> IO Text
-    readStructEnd   :: Transport t => a t -> IO ()
-    readFieldBegin  :: Transport t => a t -> IO (Text, ThriftType, Int16)
-    readFieldEnd    :: Transport t => a t -> IO ()
-    readMapBegin    :: Transport t => a t -> IO (ThriftType, ThriftType, Int32)
-    readMapEnd      :: Transport t => a t -> IO ()
-    readListBegin   :: Transport t => a t -> IO (ThriftType, Int32)
-    readListEnd     :: Transport t => a t -> IO ()
-    readSetBegin    :: Transport t => a t -> IO (ThriftType, Int32)
-    readSetEnd      :: Transport t => a t -> IO ()
-
-    readBool   :: Transport t => a t -> IO Bool
-    readByte   :: Transport t => a t -> IO Int8
-    readI16    :: Transport t => a t -> IO Int16
-    readI32    :: Transport t => a t -> IO Int32
-    readI64    :: Transport t => a t -> IO Int64
-    readDouble :: Transport t => a t -> IO Double
-    readString :: Transport t => a t -> IO Text
-    readBinary :: Transport t => a t -> IO ByteString
-
-
-skip :: (Protocol p, Transport t) => p t -> ThriftType -> IO ()
-skip _ T_STOP = return ()
-skip _ T_VOID = return ()
-skip p T_BOOL = readBool p >> return ()
-skip p T_BYTE = readByte p >> return ()
-skip p T_I16 = readI16 p >> return ()
-skip p T_I32 = readI32 p >> return ()
-skip p T_I64 = readI64 p >> return ()
-skip p T_DOUBLE = readDouble p >> return ()
-skip p T_STRING = readString p >> return ()
-skip p T_STRUCT = do _ <- readStructBegin p
-                     skipFields p
-                     readStructEnd p
-skip p T_MAP = do (k, v, s) <- readMapBegin p
-                  replicateM_ (fromIntegral s) (skip p k >> skip p v)
-                  readMapEnd p
-skip p T_SET = do (t, n) <- readSetBegin p
-                  replicateM_ (fromIntegral n) (skip p t)
-                  readSetEnd p
-skip p T_LIST = do (t, n) <- readListBegin p
-                   replicateM_ (fromIntegral n) (skip p t)
-                   readListEnd p
-
-
-skipFields :: (Protocol p, Transport t) => p t -> IO ()
-skipFields p = do
-    (_, t, _) <- readFieldBegin p
-    unless (t == T_STOP) (skip p t >> readFieldEnd p >> skipFields p)
-
+  writeVal :: Transport t => a t -> ThriftVal -> IO ()
+  writeVal p = tWrite (getTransport p) . serializeVal p
+  readVal :: Transport t => a t -> ThriftType -> IO ThriftVal
 
 data ProtocolExnType
     = PE_UNKNOWN
@@ -189,9 +82,63 @@
     | PE_SIZE_LIMIT
     | PE_BAD_VERSION
     | PE_NOT_IMPLEMENTED
-    | PE_DEPTH_LIMIT
+    | PE_MISSING_REQUIRED_FIELD
       deriving ( Eq, Show, Typeable )
 
 data ProtocolExn = ProtocolExn ProtocolExnType String
   deriving ( Show, Typeable )
 instance Exception ProtocolExn
+
+getTypeOf :: ThriftVal -> ThriftType
+getTypeOf v =  case v of
+  TStruct{} -> T_STRUCT Map.empty
+  TMap{} -> T_MAP T_VOID T_VOID
+  TList{} -> T_LIST T_VOID
+  TSet{} -> T_SET T_VOID
+  TBool{} -> T_BOOL
+  TByte{} -> T_BYTE
+  TI16{} -> T_I16
+  TI32{} -> T_I32
+  TI64{} -> T_I64
+  TString{} -> T_STRING
+  TDouble{} -> T_DOUBLE
+
+runParser :: (Protocol p, Transport t, Show a) => p t -> Parser a -> IO a
+runParser prot p = refill >>= getResult . parse p
+  where
+    refill = handle handleEOF $ toStrict <$> tRead (getTransport prot) 1
+    getResult (Done _ a) = return a
+    getResult (Partial k) = refill >>= getResult . k
+    getResult f = throw $ ProtocolExn PE_INVALID_DATA (show f)
+
+handleEOF :: SomeException -> IO BS.ByteString
+handleEOF = const $ return mempty
+
+-- | Converts a ByteString to a Floating point number
+-- The ByteString is assumed to be encoded in network order (Big Endian)
+-- therefore the behavior of this function varies based on whether the local
+-- machine is big endian or little endian.
+bsToDouble :: BS.ByteString -> Double
+bsToDouble bs = unsafeDupablePerformIO $ unsafeUseAsCString bs castBs
+  where
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+    castBs chrPtr = do
+      w <- peek (castPtr chrPtr)
+      poke (castPtr chrPtr) (byteSwap w)
+      peek (castPtr chrPtr)
+#else
+    castBs = peek . castPtr
+#endif
+
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+-- | Swap endianness of a 64-bit word
+byteSwap :: Word64 -> Word64
+byteSwap w = (w `shiftL` 56 .&. 0xFF00000000000000) .|.
+             (w `shiftL` 40 .&. 0x00FF000000000000) .|.
+             (w `shiftL` 24 .&. 0x0000FF0000000000) .|.
+             (w `shiftL` 8  .&. 0x000000FF00000000) .|.
+             (w `shiftR` 8  .&. 0x00000000FF000000) .|.
+             (w `shiftR` 24 .&. 0x0000000000FF0000) .|.
+             (w `shiftR` 40 .&. 0x000000000000FF00) .|.
+             (w `shiftR` 56 .&. 0x00000000000000FF)
+#endif
diff --git a/lib/hs/src/Thrift/Protocol/Binary.hs b/lib/hs/src/Thrift/Protocol/Binary.hs
index 1bc9add..ac78483 100644
--- a/lib/hs/src/Thrift/Protocol/Binary.hs
+++ b/lib/hs/src/Thrift/Protocol/Binary.hs
@@ -1,6 +1,3 @@
-{-# LANGUAGE ExistentialQuantification #-}
-{-# LANGUAGE MagicHash #-}
-{-# LANGUAGE OverloadedStrings #-}
 --
 -- Licensed to the Apache Software Foundation (ASF) under one
 -- or more contributor license agreements. See the NOTICE file
@@ -20,145 +17,169 @@
 -- under the License.
 --
 
+{-# LANGUAGE CPP #-}
+{-# LANGUAGE ExistentialQuantification #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+
 module Thrift.Protocol.Binary
     ( module Thrift.Protocol
     , BinaryProtocol(..)
     ) where
 
 import Control.Exception ( throw )
-import Control.Monad ( liftM )
-
-import qualified Data.Binary
+import Control.Monad
 import Data.Bits
+import Data.ByteString.Lazy.Builder
+import Data.Functor
 import Data.Int
+import Data.Monoid
 import Data.Text.Lazy.Encoding ( decodeUtf8, encodeUtf8 )
 
-import GHC.Exts
-import GHC.Word
-
 import Thrift.Protocol
 import Thrift.Transport
+import Thrift.Types
 
+import qualified Data.Attoparsec.ByteString as P
+import qualified Data.Attoparsec.ByteString.Lazy as LP
+import qualified Data.Binary as Binary
 import qualified Data.ByteString.Lazy as LBS
+import qualified Data.HashMap.Strict as Map
+import qualified Data.Text.Lazy as LT
 
-version_mask :: Int32
-version_mask = 0xffff0000
+data BinaryProtocol a = BinaryProtocol a
 
-version_1 :: Int32
-version_1    = 0x80010000
-
-data BinaryProtocol a = Transport a => BinaryProtocol a
-
-
+-- NOTE: Reading and Writing functions rely on Builders and Data.Binary to
+-- encode and decode data.  Data.Binary assumes that the binary values it is
+-- encoding to and decoding from are in BIG ENDIAN format, and converts the
+-- endianness as necessary to match the local machine.
 instance Protocol BinaryProtocol where
     getTransport (BinaryProtocol t) = t
 
-    writeMessageBegin p (n, t, s) = do
-        writeI32 p (version_1 .|. (fromIntegral $ fromEnum t))
-        writeString p n
-        writeI32 p s
-    writeMessageEnd _ = return ()
+    writeMessageBegin p (n, t, s) = tWrite (getTransport p) $ toLazyByteString $
+        buildBinaryValue (TI32 (version1 .|. fromIntegral (fromEnum t))) <>
+        buildBinaryValue (TString $ encodeUtf8 n) <>
+        buildBinaryValue (TI32 s)
 
-    writeStructBegin _ _ = return ()
-    writeStructEnd _ = return ()
-    writeFieldBegin p (_, t, i) = writeType p t >> writeI16 p i
-    writeFieldEnd _ = return ()
-    writeFieldStop p = writeType p T_STOP
-    writeMapBegin p (k, v, n) = writeType p k >> writeType p v >> writeI32 p n
-    writeMapEnd _ = return ()
-    writeListBegin p (t, n) = writeType p t >> writeI32 p n
-    writeListEnd _ = return ()
-    writeSetBegin p (t, n) = writeType p t >> writeI32 p n
-    writeSetEnd _ = return ()
+    readMessageBegin p = runParser p $ do
+      TI32 ver <- parseBinaryValue T_I32
+      if ver .&. versionMask /= version1
+        then throw $ ProtocolExn PE_BAD_VERSION "Missing version identifier"
+        else do
+          TString s <- parseBinaryValue T_STRING
+          TI32 sz <- parseBinaryValue T_I32
+          return (decodeUtf8 s, toEnum $ fromIntegral $ ver .&. 0xFF, sz)
 
-    writeBool p b = tWrite (getTransport p) $ LBS.singleton $ toEnum $ if b then 1 else 0
-    writeByte p b = tWrite (getTransport p) $ Data.Binary.encode b
-    writeI16 p b = tWrite (getTransport p) $ Data.Binary.encode b
-    writeI32 p b = tWrite (getTransport p) $ Data.Binary.encode b
-    writeI64 p b = tWrite (getTransport p) $ Data.Binary.encode b
-    writeDouble p d = writeI64 p (fromIntegral $ floatBits d)
-    writeString p s = writeI32 p (fromIntegral $ LBS.length s') >> tWrite (getTransport p) s'
-      where
-        s' = encodeUtf8 s
-    writeBinary p s = writeI32 p (fromIntegral $ LBS.length s) >> tWrite (getTransport p) s
+    serializeVal _ = toLazyByteString . buildBinaryValue
+    deserializeVal _ ty bs =
+      case LP.eitherResult $ LP.parse (parseBinaryValue ty) bs of
+        Left s -> error s
+        Right val -> val
 
-    readMessageBegin p = do
-        ver <- readI32 p
-        if (ver .&. version_mask /= version_1)
-            then throw $ ProtocolExn PE_BAD_VERSION "Missing version identifier"
-            else do
-              s <- readString p
-              sz <- readI32 p
-              return (s, toEnum $ fromIntegral $ ver .&. 0xFF, sz)
-    readMessageEnd _ = return ()
-    readStructBegin _ = return ""
-    readStructEnd _ = return ()
-    readFieldBegin p = do
-        t <- readType p
-        n <- if t /= T_STOP then readI16 p else return 0
-        return ("", t, n)
-    readFieldEnd _ = return ()
-    readMapBegin p = do
-        kt <- readType p
-        vt <- readType p
-        n <- readI32 p
-        return (kt, vt, n)
-    readMapEnd _ = return ()
-    readListBegin p = do
-        t <- readType p
-        n <- readI32 p
-        return (t, n)
-    readListEnd _ = return ()
-    readSetBegin p = do
-        t <- readType p
-        n <- readI32 p
-        return (t, n)
-    readSetEnd _ = return ()
+    readVal p = runParser p . parseBinaryValue
 
-    readBool p = (== 1) `fmap` readByte p
+-- | Writing Functions
+buildBinaryValue :: ThriftVal -> Builder
+buildBinaryValue (TStruct fields) = buildBinaryStruct fields <> buildType T_STOP
+buildBinaryValue (TMap ky vt entries) =
+  buildType ky <>
+  buildType vt <>
+  int32BE (fromIntegral (length entries)) <>
+  buildBinaryMap entries
+buildBinaryValue (TList ty entries) =
+  buildType ty <>
+  int32BE (fromIntegral (length entries)) <>
+  buildBinaryList entries
+buildBinaryValue (TSet ty entries) =
+  buildType ty <>
+  int32BE (fromIntegral (length entries)) <>
+  buildBinaryList entries
+buildBinaryValue (TBool b) =
+  word8 $ toEnum $ if b then 1 else 0
+buildBinaryValue (TByte b) = int8 b
+buildBinaryValue (TI16 i) = int16BE i
+buildBinaryValue (TI32 i) = int32BE i
+buildBinaryValue (TI64 i) = int64BE i
+buildBinaryValue (TDouble d) = doubleBE d
+buildBinaryValue (TString s) = int32BE len <> lazyByteString s
+  where
+    len :: Int32 = fromIntegral (LBS.length s)
 
-    readByte p = do
-        bs <- tReadAll (getTransport p) 1
-        return $ Data.Binary.decode bs
+buildBinaryStruct :: Map.HashMap Int16 (LT.Text, ThriftVal) -> Builder
+buildBinaryStruct = Map.foldrWithKey combine mempty
+  where
+    combine fid (_,val) s =
+      buildTypeOf val <> int16BE fid <> buildBinaryValue val <> s
 
-    readI16 p = do
-        bs <- tReadAll (getTransport p) 2
-        return $ Data.Binary.decode bs
+buildBinaryMap :: [(ThriftVal, ThriftVal)] -> Builder
+buildBinaryMap = foldl combine mempty
+  where
+    combine s (key, val) = s <> buildBinaryValue key <> buildBinaryValue val
 
-    readI32 p = do
-        bs <- tReadAll (getTransport p) 4
-        return $ Data.Binary.decode bs
+buildBinaryList :: [ThriftVal] -> Builder
+buildBinaryList = foldr (mappend . buildBinaryValue) mempty
 
-    readI64 p = do
-        bs <- tReadAll (getTransport p) 8
-        return $ Data.Binary.decode bs
+-- | Reading Functions
+parseBinaryValue :: ThriftType -> P.Parser ThriftVal
+parseBinaryValue (T_STRUCT _) = TStruct <$> parseBinaryStruct
+parseBinaryValue (T_MAP _ _) = do
+  kt <- parseType
+  vt <- parseType
+  n <- Binary.decode . LBS.fromStrict <$> P.take 4
+  TMap kt vt <$> parseBinaryMap kt vt n
+parseBinaryValue (T_LIST _) = do
+  t <- parseType
+  n <- Binary.decode . LBS.fromStrict <$> P.take 4
+  TList t <$> parseBinaryList t n
+parseBinaryValue (T_SET _) = do
+  t <- parseType
+  n <- Binary.decode . LBS.fromStrict <$> P.take 4
+  TSet t <$> parseBinaryList t n
+parseBinaryValue T_BOOL = TBool . (/=0) <$> P.anyWord8
+parseBinaryValue T_BYTE = TByte . Binary.decode . LBS.fromStrict <$> P.take 1
+parseBinaryValue T_I16 = TI16 . Binary.decode . LBS.fromStrict <$> P.take 2
+parseBinaryValue T_I32 = TI32 . Binary.decode . LBS.fromStrict <$> P.take 4
+parseBinaryValue T_I64 = TI64 . Binary.decode . LBS.fromStrict <$> P.take 8
+parseBinaryValue T_DOUBLE = TDouble . bsToDouble <$> P.take 8
+parseBinaryValue T_STRING = do
+  i :: Int32  <- Binary.decode . LBS.fromStrict <$> P.take 4
+  TString . LBS.fromStrict <$> P.take (fromIntegral i)
+parseBinaryValue ty = error $ "Cannot read value of type " ++ show ty
 
-    readDouble p = do
-        bs <- readI64 p
-        return $ floatOfBits $ fromIntegral bs
+parseBinaryStruct :: P.Parser (Map.HashMap Int16 (LT.Text, ThriftVal))
+parseBinaryStruct = Map.fromList <$> P.manyTill parseField (matchType T_STOP)
+  where
+    parseField = do
+      t <- parseType
+      n <- Binary.decode . LBS.fromStrict <$> P.take 2
+      v <- parseBinaryValue t
+      return (n, ("", v))
 
-    readString p = do
-        i <- readI32 p
-        decodeUtf8 `liftM` tReadAll (getTransport p) (fromIntegral i)
+parseBinaryMap :: ThriftType -> ThriftType -> Int32 -> P.Parser [(ThriftVal, ThriftVal)]
+parseBinaryMap kt vt n | n <= 0 = return []
+                       | otherwise = do
+  k <- parseBinaryValue kt
+  v <- parseBinaryValue vt
+  ((k,v) :) <$> parseBinaryMap kt vt (n-1)
 
-    readBinary p = do
-        i <- readI32 p
-        tReadAll (getTransport p) (fromIntegral i)
+parseBinaryList :: ThriftType -> Int32 -> P.Parser [ThriftVal]
+parseBinaryList ty n | n <= 0 = return []
+                     | otherwise = liftM2 (:) (parseBinaryValue ty)
+                                   (parseBinaryList ty (n-1))
+
 
 
 -- | Write a type as a byte
-writeType :: (Protocol p, Transport t) => p t -> ThriftType -> IO ()
-writeType p t = writeByte p (fromIntegral $ fromEnum t)
+buildType :: ThriftType -> Builder
+buildType t = word8 $ fromIntegral $ fromEnum t
+
+-- | Write type of a ThriftVal as a byte
+buildTypeOf :: ThriftVal -> Builder
+buildTypeOf = buildType . getTypeOf
 
 -- | Read a byte as though it were a ThriftType
-readType :: (Protocol p, Transport t) => p t -> IO ThriftType
-readType p = do
-    b <- readByte p
-    return $ toEnum $ fromIntegral b
+parseType :: P.Parser ThriftType
+parseType = toEnum . fromIntegral <$> P.anyWord8
 
-floatBits :: Double -> Word64
-floatBits (D# d#) = W64# (unsafeCoerce# d#)
-
-floatOfBits :: Word64 -> Double
-floatOfBits (W64# b#) = D# (unsafeCoerce# b#)
-
+matchType :: ThriftType -> P.Parser ThriftType
+matchType t = t <$ P.word8 (fromIntegral $ fromEnum t)
diff --git a/lib/hs/src/Thrift/Protocol/Compact.hs b/lib/hs/src/Thrift/Protocol/Compact.hs
new file mode 100644
index 0000000..c3bd22d
--- /dev/null
+++ b/lib/hs/src/Thrift/Protocol/Compact.hs
@@ -0,0 +1,292 @@
+--
+-- Licensed to the Apache Software Foundation (ASF) under one
+-- or more contributor license agreements. See the NOTICE file
+-- distributed with this work for additional information
+-- regarding copyright ownership. The ASF licenses this file
+-- to you under the Apache License, Version 2.0 (the
+-- "License"); you may not use this file except in compliance
+-- with the License. You may obtain a copy of the License at
+--
+--   http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing,
+-- software distributed under the License is distributed on an
+-- "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+-- KIND, either express or implied. See the License for the
+-- specific language governing permissions and limitations
+-- under the License.
+--
+
+{-# LANGUAGE CPP #-}
+{-# LANGUAGE ExistentialQuantification #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+
+module Thrift.Protocol.Compact
+    ( module Thrift.Protocol
+    , CompactProtocol(..)
+    ) where
+
+import Control.Applicative
+import Control.Exception ( throw )
+import Control.Monad
+import Data.Attoparsec.ByteString as P
+import Data.Attoparsec.ByteString.Lazy as LP
+import Data.Bits
+import Data.ByteString.Lazy.Builder as B
+import Data.Int
+import Data.List as List
+import Data.Monoid
+import Data.Word
+import Data.Text.Lazy.Encoding ( decodeUtf8, encodeUtf8 )
+
+import Thrift.Protocol hiding (versionMask)
+import Thrift.Transport
+import Thrift.Types
+
+import qualified Data.ByteString as BS
+import qualified Data.ByteString.Lazy as LBS
+import qualified Data.HashMap.Strict as Map
+import qualified Data.Text.Lazy as LT
+
+-- | the Compact Protocol implements the standard Thrift 'TCompactProcotol'
+-- which is similar to the 'TBinaryProtocol', but takes less space on the wire.
+-- Integral types are encoded using as varints.
+data CompactProtocol a = CompactProtocol a
+                         -- ^ Constuct a 'CompactProtocol' with a 'Transport'
+
+protocolID, version, typeMask :: Int8
+protocolID  = 0x82 -- 1000 0010
+version     = 0x01
+versionMask = 0x1f -- 0001 1111
+typeMask    = 0xe0 -- 1110 0000
+typeShiftAmount :: Int
+typeShiftAmount = 5
+
+
+instance Protocol CompactProtocol where
+    getTransport (CompactProtocol t) = t
+
+    writeMessageBegin p (n, t, s) = tWrite (getTransport p) $ toLazyByteString $
+      B.int8 protocolID <>
+      B.int8 ((version .&. versionMask) .|.
+              (((fromIntegral $ fromEnum t) `shiftL`
+                typeShiftAmount) .&. typeMask)) <>
+      buildVarint (i32ToZigZag s) <>
+      buildCompactValue (TString $ encodeUtf8 n)
+    
+    readMessageBegin p = runParser p $ do
+      pid <- fromIntegral <$> P.anyWord8
+      when (pid /= protocolID) $ error "Bad Protocol ID"
+      w <- fromIntegral <$> P.anyWord8
+      let ver = w .&. versionMask 
+      when (ver /= version) $ error "Bad Protocol version"
+      let typ = (w `shiftR` typeShiftAmount) .&. 0x03
+      seqId <- parseVarint zigZagToI32
+      TString name <- parseCompactValue T_STRING
+      return (decodeUtf8 name, toEnum $ fromIntegral $ typ, seqId)
+
+    serializeVal _ = toLazyByteString . buildCompactValue
+    deserializeVal _ ty bs =
+      case LP.eitherResult $ LP.parse (parseCompactValue ty) bs of
+        Left s -> error s
+        Right val -> val
+
+    readVal p ty = runParser p $ parseCompactValue ty
+
+
+-- | Writing Functions
+buildCompactValue :: ThriftVal -> Builder
+buildCompactValue (TStruct fields) = buildCompactStruct fields
+buildCompactValue (TMap kt vt entries) =
+  let len = fromIntegral $ length entries :: Word32 in
+  if len == 0
+  then B.word8 0x00
+  else buildVarint len <>
+       B.word8 (fromTType kt `shiftL` 4 .|. fromTType vt) <>
+       buildCompactMap entries
+buildCompactValue (TList ty entries) =
+  let len = length entries in
+  (if len < 15
+   then B.word8 $ (fromIntegral len `shiftL` 4) .|. fromTType ty
+   else B.word8 (0xF0 .|. fromTType ty) <>
+        buildVarint (fromIntegral len :: Word32)) <>
+  buildCompactList entries
+buildCompactValue (TSet ty entries) = buildCompactValue (TList ty entries)
+buildCompactValue (TBool b) =
+  B.word8 $ toEnum $ if b then 1 else 0
+buildCompactValue (TByte b) = int8 b
+buildCompactValue (TI16 i) = buildVarint $ i16ToZigZag i
+buildCompactValue (TI32 i) = buildVarint $ i32ToZigZag i
+buildCompactValue (TI64 i) = buildVarint $ i64ToZigZag i
+buildCompactValue (TDouble d) = doubleBE d
+buildCompactValue (TString s) = buildVarint len <> lazyByteString s
+  where
+    len = fromIntegral (LBS.length s) :: Word32
+
+buildCompactStruct :: Map.HashMap Int16 (LT.Text, ThriftVal) -> Builder
+buildCompactStruct = flip (loop 0) mempty . Map.toList
+  where
+    loop _ [] acc = acc <> B.word8 (fromTType T_STOP)
+    loop lastId ((fid, (_,val)) : fields) acc = loop fid fields $ acc <>
+      (if fid > lastId && fid - lastId <= 15
+       then B.word8 $ fromIntegral ((fid - lastId) `shiftL` 4) .|. typeOf val
+       else B.word8 (typeOf val) <> buildVarint (i16ToZigZag fid)) <>
+      (if typeOf val > 0x02 -- Not a T_BOOL
+       then buildCompactValue val
+       else mempty) -- T_BOOLs are encoded in the type
+buildCompactMap :: [(ThriftVal, ThriftVal)] -> Builder
+buildCompactMap = foldl combine mempty
+  where
+    combine s (key, val) = buildCompactValue key <> buildCompactValue val <> s
+
+buildCompactList :: [ThriftVal] -> Builder
+buildCompactList = foldr (mappend . buildCompactValue) mempty
+
+-- | Reading Functions
+parseCompactValue :: ThriftType -> Parser ThriftVal
+parseCompactValue (T_STRUCT _) = TStruct <$> parseCompactStruct
+parseCompactValue (T_MAP kt' vt') = do
+  n <- parseVarint id
+  if n == 0
+    then return $ TMap kt' vt' []
+    else do
+    w <- P.anyWord8
+    let kt = typeFrom $ w `shiftR` 4
+        vt = typeFrom $ w .&. 0x0F
+    TMap kt vt <$> parseCompactMap kt vt n
+parseCompactValue (T_LIST ty) = TList ty <$> parseCompactList
+parseCompactValue (T_SET ty) = TSet ty <$> parseCompactList
+parseCompactValue T_BOOL = TBool . (/=0) <$> P.anyWord8
+parseCompactValue T_BYTE = TByte . fromIntegral <$> P.anyWord8
+parseCompactValue T_I16 = TI16 <$> parseVarint zigZagToI16
+parseCompactValue T_I32 = TI32 <$> parseVarint zigZagToI32
+parseCompactValue T_I64 = TI64 <$> parseVarint zigZagToI64
+parseCompactValue T_DOUBLE = TDouble . bsToDouble <$> P.take 8
+parseCompactValue T_STRING = do
+  len :: Word32 <- parseVarint id
+  TString . LBS.fromStrict <$> P.take (fromIntegral len)
+parseCompactValue ty = error $ "Cannot read value of type " ++ show ty
+
+parseCompactStruct :: Parser (Map.HashMap Int16 (LT.Text, ThriftVal))
+parseCompactStruct = Map.fromList <$> parseFields 0
+  where
+    parseFields :: Int16 -> Parser [(Int16, (LT.Text, ThriftVal))]
+    parseFields lastId = do
+      w <- P.anyWord8
+      if w == 0x00
+        then return []
+        else do
+          let ty = typeFrom (w .&. 0x0F)
+              modifier = (w .&. 0xF0) `shiftR` 4
+          fid <- if modifier /= 0
+                 then return (lastId + fromIntegral modifier)
+                 else parseVarint zigZagToI16
+          val <- if ty == T_BOOL
+                 then return (TBool $ (w .&. 0x0F) == 0x01)
+                 else parseCompactValue ty
+          ((fid, (LT.empty, val)) : ) <$> parseFields fid
+
+parseCompactMap :: ThriftType -> ThriftType -> Int32 ->
+                   Parser [(ThriftVal, ThriftVal)]
+parseCompactMap kt vt n | n <= 0 = return []
+                        | otherwise = do
+  k <- parseCompactValue kt
+  v <- parseCompactValue vt
+  ((k,v) :) <$> parseCompactMap kt vt (n-1)
+
+parseCompactList :: Parser [ThriftVal]
+parseCompactList = do
+  w <- P.anyWord8
+  let ty = typeFrom $ w .&. 0x0F
+      lsize = w `shiftR` 4
+  size <- if lsize == 0xF
+          then parseVarint id
+          else return $ fromIntegral lsize
+  loop ty size
+  where
+    loop :: ThriftType -> Int32 -> Parser [ThriftVal]
+    loop ty n | n <= 0 = return []
+              | otherwise = liftM2 (:) (parseCompactValue ty)
+                            (loop ty (n-1))
+
+-- Signed numbers must be converted to "Zig Zag" format before they can be
+-- serialized in the Varint format
+i16ToZigZag :: Int16 -> Word16
+i16ToZigZag n = fromIntegral $ (n `shiftL` 1) `xor` (n `shiftR` 15)
+
+zigZagToI16 :: Word16 -> Int16
+zigZagToI16 n = fromIntegral $ (n `shiftR` 1) `xor` negate (n .&. 0x1)
+
+i32ToZigZag :: Int32 -> Word32
+i32ToZigZag n = fromIntegral $ (n `shiftL` 1) `xor` (n `shiftR` 31)
+
+zigZagToI32 :: Word32 -> Int32
+zigZagToI32 n = fromIntegral $ (n `shiftR` 1) `xor` negate (n .&. 0x1)
+
+i64ToZigZag :: Int64 -> Word64
+i64ToZigZag n = fromIntegral $ (n `shiftL` 1) `xor` (n `shiftR` 63)
+
+zigZagToI64 :: Word64 -> Int64
+zigZagToI64 n = fromIntegral $ (n `shiftR` 1) `xor` negate (n .&. 0x1)
+
+buildVarint :: (Bits a, Integral a)  => a -> Builder
+buildVarint n | n .&. complement 0x7F == 0 = B.word8 $ fromIntegral n
+              | otherwise = B.word8 (0x80 .|. (fromIntegral n .&. 0x7F)) <>
+                            buildVarint (n `shiftR` 7)
+
+parseVarint :: (Bits a, Integral a, Ord a) => (a -> b) -> Parser b
+parseVarint fromZigZag = do
+  bytestemp <- BS.unpack <$> P.takeTill (not . flip testBit 7)
+  lsb <- P.anyWord8
+  let bytes = lsb : List.reverse bytestemp
+  return $ fromZigZag $ List.foldl' combine 0x00 bytes
+  where combine a b = (a `shiftL` 7) .|. (fromIntegral b .&. 0x7f)
+
+-- | Compute the Compact Type
+fromTType :: ThriftType -> Word8
+fromTType ty = case ty of
+  T_STOP -> 0x00
+  T_BOOL -> 0x01
+  T_BYTE -> 0x03
+  T_I16 -> 0x04
+  T_I32 -> 0x05
+  T_I64 -> 0x06
+  T_DOUBLE -> 0x07
+  T_STRING -> 0x08
+  T_LIST{} -> 0x09
+  T_SET{} -> 0x0A
+  T_MAP{} -> 0x0B
+  T_STRUCT{} -> 0x0C
+  T_VOID -> error "No Compact type for T_VOID"
+
+typeOf :: ThriftVal -> Word8
+typeOf v = case v of
+  TBool True -> 0x01
+  TBool False -> 0x02
+  TByte _ -> 0x03
+  TI16 _ -> 0x04
+  TI32 _ -> 0x05
+  TI64 _ -> 0x06
+  TDouble _ -> 0x07
+  TString _ -> 0x08
+  TList{} -> 0x09
+  TSet{} -> 0x0A
+  TMap{} -> 0x0B
+  TStruct{} -> 0x0C
+  
+typeFrom :: Word8 -> ThriftType
+typeFrom w = case w of
+  0x01 -> T_BOOL
+  0x02 -> T_BOOL
+  0x03 -> T_BYTE
+  0x04 -> T_I16
+  0x05 -> T_I32
+  0x06 -> T_I64
+  0x07 -> T_DOUBLE
+  0x08 -> T_STRING
+  0x09 -> T_LIST T_VOID
+  0x0A -> T_SET T_VOID
+  0x0B -> T_MAP T_VOID T_VOID
+  0x0C -> T_STRUCT Map.empty
+  n -> error $ "typeFrom: " ++ show n ++ " is not a compact type"
diff --git a/lib/hs/src/Thrift/Protocol/JSON.hs b/lib/hs/src/Thrift/Protocol/JSON.hs
new file mode 100644
index 0000000..f378ea2
--- /dev/null
+++ b/lib/hs/src/Thrift/Protocol/JSON.hs
@@ -0,0 +1,325 @@
+--
+-- Licensed to the Apache Software Foundation (ASF) under one
+-- or more contributor license agreements. See the NOTICE file
+-- distributed with this work for additional information
+-- regarding copyright ownership. The ASF licenses this file
+-- to you under the Apache License, Version 2.0 (the
+-- "License"); you may not use this file except in compliance
+-- with the License. You may obtain a copy of the License at
+--
+--   http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing,
+-- software distributed under the License is distributed on an
+-- "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+-- KIND, either express or implied. See the License for the
+-- specific language governing permissions and limitations
+-- under the License.
+--
+
+{-# LANGUAGE CPP #-}
+{-# LANGUAGE ExistentialQuantification #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE TupleSections #-}
+
+module Thrift.Protocol.JSON
+    ( module Thrift.Protocol
+    , JSONProtocol(..)
+    ) where
+
+import Control.Applicative
+import Control.Monad
+import Data.Attoparsec.ByteString as P
+import Data.Attoparsec.ByteString.Char8 as PC
+import Data.Attoparsec.ByteString.Lazy as LP
+import Data.ByteString.Lazy.Builder as B
+import Data.ByteString.Internal (c2w, w2c)
+import Data.Functor
+import Data.Int
+import Data.List
+import Data.Maybe (catMaybes)
+import Data.Monoid
+import Data.Text.Lazy.Encoding
+import Data.Word
+import qualified Data.HashMap.Strict as Map
+
+import Thrift.Protocol
+import Thrift.Transport
+import Thrift.Types
+
+import qualified Data.ByteString.Lazy as LBS
+import qualified Data.Text.Lazy as LT
+
+-- | The JSON Protocol data uses the standard 'TSimpleJSONProtocol'.  Data is
+-- encoded as a JSON 'ByteString'
+data JSONProtocol t = JSONProtocol t
+                      -- ^ Construct a 'JSONProtocol' with a 'Transport'
+
+instance Protocol JSONProtocol where
+    getTransport (JSONProtocol t) = t
+
+    writeMessageBegin (JSONProtocol t) (s, ty, sq) = tWrite t $ toLazyByteString $
+      B.char8 '[' <> buildShowable (1 :: Int32) <>
+      B.string8 ",\"" <> escape (encodeUtf8 s) <> B.char8 '\"' <>
+      B.char8 ',' <> buildShowable (fromEnum ty) <>
+      B.char8 ',' <> buildShowable sq <>
+      B.char8 ','
+    writeMessageEnd (JSONProtocol t) = tWrite t "]"
+    readMessageBegin p = runParser p $ skipSpace *> do
+      _ver :: Int32 <- lexeme (PC.char8 '[') *> lexeme (signed decimal)
+      bs <- lexeme (PC.char8 ',') *> lexeme escapedString
+      case decodeUtf8' bs of
+        Left _ -> fail "readMessage: invalid text encoding"
+        Right str -> do
+          ty <- toEnum <$> (lexeme (PC.char8 ',') *> lexeme (signed decimal))
+          seqNum <- lexeme (PC.char8 ',') *> lexeme (signed decimal)
+          _ <- PC.char8 ','
+          return (str, ty, seqNum)
+    readMessageEnd p = void $ runParser p (PC.char8 ']')
+
+    serializeVal _ = toLazyByteString . buildJSONValue
+    deserializeVal _ ty bs =
+      case LP.eitherResult $ LP.parse (parseJSONValue ty) bs of
+        Left s -> error s
+        Right val -> val
+
+    readVal p ty = runParser p $ skipSpace *> parseJSONValue ty
+
+
+-- Writing Functions
+
+buildJSONValue :: ThriftVal -> Builder
+buildJSONValue (TStruct fields) = B.char8 '{' <> buildJSONStruct fields <> B.char8 '}'
+buildJSONValue (TMap kt vt entries) =
+  B.char8 '[' <> B.char8 '"' <> getTypeName kt <> B.char8 '"' <>
+  B.char8 ',' <> B.char8 '"' <> getTypeName vt <> B.char8 '"' <>
+  B.char8 ',' <> buildShowable (length entries) <>
+  B.char8 ',' <> B.char8 '{' <> buildJSONMap entries <> B.char8 '}' <>
+  B.char8 ']'
+buildJSONValue (TList ty entries) =
+  B.char8 '[' <> B.char8 '"' <> getTypeName ty <> B.char8 '"' <>
+  B.char8 ',' <> buildShowable (length entries) <>
+  (if length entries > 0
+   then B.char8 ',' <> buildJSONList entries
+   else mempty) <>
+  B.char8 ']'
+buildJSONValue (TSet ty entries) = buildJSONValue (TList ty entries)
+buildJSONValue (TBool b) = if b then B.string8 "true" else B.string8 "false"
+buildJSONValue (TByte b) = buildShowable b
+buildJSONValue (TI16 i) = buildShowable i
+buildJSONValue (TI32 i) = buildShowable i
+buildJSONValue (TI64 i) = buildShowable i
+buildJSONValue (TDouble d) = buildShowable d
+buildJSONValue (TString s) = B.char8 '\"' <> escape s <> B.char8 '\"'
+
+buildJSONStruct :: Map.HashMap Int16 (LT.Text, ThriftVal) -> Builder
+buildJSONStruct = mconcat . intersperse (B.char8 ',') . Map.foldrWithKey buildField []
+  where 
+    buildField fid (_,val) = (:) $
+      B.char8 '"' <> buildShowable fid <> B.string8 "\":" <> 
+      B.char8 '{' <>
+      B.char8 '"' <> getTypeName (getTypeOf val) <> B.string8 "\":" <>
+      buildJSONValue val <>
+      B.char8 '}'
+
+buildJSONMap :: [(ThriftVal, ThriftVal)] -> Builder
+buildJSONMap = mconcat . intersperse (B.char8 ',') . map buildKV
+  where
+    buildKV (key@(TString _), val) =
+      buildJSONValue key <> B.char8 ':' <> buildJSONValue val
+    buildKV (key, val) =
+      B.char8 '\"' <> buildJSONValue key <> B.string8 "\":" <> buildJSONValue val
+buildJSONList :: [ThriftVal] -> Builder
+buildJSONList = mconcat . intersperse (B.char8 ',') . map buildJSONValue
+
+buildShowable :: Show a => a ->  Builder
+buildShowable = B.string8 . show
+
+-- Reading Functions
+
+parseJSONValue :: ThriftType -> Parser ThriftVal
+parseJSONValue (T_STRUCT tmap) =
+  TStruct <$> (lexeme (PC.char8 '{') *> parseJSONStruct tmap <* PC.char8 '}')
+parseJSONValue (T_MAP kt vt) = fmap (TMap kt vt) $
+  between '[' ']' $
+    lexeme escapedString *> lexeme (PC.char8 ',') *>
+    lexeme escapedString *> lexeme (PC.char8 ',') *>
+    lexeme decimal *> lexeme (PC.char8 ',') *>
+    between '{' '}' (parseJSONMap kt vt)
+parseJSONValue (T_LIST ty) = fmap (TList ty) $
+  between '[' ']' $ do
+    len <- lexeme escapedString *> lexeme (PC.char8 ',') *>
+           lexeme decimal <* lexeme (PC.char8 ',')
+    if len > 0 then parseJSONList ty else return []
+parseJSONValue (T_SET ty) = fmap (TSet ty) $
+  between '[' ']' $ do
+    len <- lexeme escapedString *> lexeme (PC.char8 ',') *>
+           lexeme decimal <* lexeme (PC.char8 ',')
+    if len > 0 then parseJSONList ty else return []
+parseJSONValue T_BOOL =
+  (TBool True <$ string "true") <|> (TBool False <$ string "false")
+parseJSONValue T_BYTE = TByte <$> signed decimal
+parseJSONValue T_I16 = TI16 <$> signed decimal
+parseJSONValue T_I32 = TI32 <$> signed decimal
+parseJSONValue T_I64 = TI64 <$> signed decimal
+parseJSONValue T_DOUBLE = TDouble <$> double
+parseJSONValue T_STRING = TString <$> escapedString
+parseJSONValue T_STOP = fail "parseJSONValue: cannot parse type T_STOP"
+parseJSONValue T_VOID = fail "parseJSONValue: cannot parse type T_VOID"
+
+parseAnyValue :: Parser ()
+parseAnyValue = choice $
+                skipBetween '{' '}' :
+                skipBetween '[' ']' :
+                map (void . parseJSONValue)
+                  [ T_BOOL
+                  , T_I16
+                  , T_I32
+                  , T_I64
+                  , T_DOUBLE
+                  , T_STRING
+                  ]
+  where
+    skipBetween :: Char -> Char -> Parser ()
+    skipBetween a b = between a b $ void (PC.satisfy (\c -> c /= a && c /= b))
+                                          <|> skipBetween a b
+
+parseJSONStruct :: TypeMap -> Parser (Map.HashMap Int16 (LT.Text, ThriftVal))
+parseJSONStruct tmap = Map.fromList . catMaybes <$> parseField
+                       `sepBy` lexeme (PC.char8 ',')
+  where
+    parseField = do
+      fid <- lexeme (between '"' '"' decimal) <* lexeme (PC.char8 ':')
+      case Map.lookup fid tmap of
+        Just (str, ftype) -> between '{' '}' $ do
+          _ <- lexeme (escapedString) *> lexeme (PC.char8 ':')
+          val <- lexeme (parseJSONValue ftype)
+          return $ Just (fid, (str, val))
+        Nothing -> lexeme parseAnyValue *> return Nothing
+
+parseJSONMap :: ThriftType -> ThriftType -> Parser [(ThriftVal, ThriftVal)]
+parseJSONMap kt vt =
+  ((,) <$> lexeme (PC.char8 '"' *> parseJSONValue kt <* PC.char8 '"') <*>
+   (lexeme (PC.char8 ':') *> lexeme (parseJSONValue vt))) `sepBy`
+  lexeme (PC.char8 ',')
+
+parseJSONList :: ThriftType -> Parser [ThriftVal]
+parseJSONList ty = lexeme (parseJSONValue ty) `sepBy` lexeme (PC.char8 ',')
+
+escapedString :: Parser LBS.ByteString
+escapedString = PC.char8 '"' *>
+                (LBS.pack <$> P.many' (escapedChar <|> notChar8 '"')) <*
+                PC.char8 '"'
+
+escapedChar :: Parser Word8
+escapedChar = PC.char8 '\\' *> (c2w <$> choice
+                                [ '\SOH' <$ P.string "u0001"
+                                , '\STX' <$ P.string "u0002"
+                                , '\ETX' <$ P.string "u0003"
+                                , '\EOT' <$ P.string "u0004"
+                                , '\ENQ' <$ P.string "u0005"
+                                , '\ACK' <$ P.string "u0006"
+                                , '\BEL' <$ P.string "u0007"
+                                , '\BS'  <$ P.string "u0008"
+                                , '\VT'  <$ P.string "u000b"
+                                , '\FF'  <$ P.string "u000c"
+                                , '\CR'  <$ P.string "u000d"
+                                , '\SO'  <$ P.string "u000e"
+                                , '\SI'  <$ P.string "u000f"
+                                , '\DLE' <$ P.string "u0010"
+                                , '\DC1' <$ P.string "u0011"
+                                , '\DC2' <$ P.string "u0012"
+                                , '\DC3' <$ P.string "u0013"
+                                , '\DC4' <$ P.string "u0014"
+                                , '\NAK' <$ P.string "u0015"
+                                , '\SYN' <$ P.string "u0016"
+                                , '\ETB' <$ P.string "u0017"
+                                , '\CAN' <$ P.string "u0018"
+                                , '\EM'  <$ P.string "u0019"
+                                , '\SUB' <$ P.string "u001a"
+                                , '\ESC' <$ P.string "u001b"
+                                , '\FS'  <$ P.string "u001c"
+                                , '\GS'  <$ P.string "u001d"
+                                , '\RS'  <$ P.string "u001e"
+                                , '\US'  <$ P.string "u001f"
+                                , '\DEL' <$ P.string "u007f"
+                                , '\0' <$ PC.char '0'
+                                , '\a' <$ PC.char 'a'
+                                , '\b' <$ PC.char 'b'
+                                , '\f' <$ PC.char 'f'
+                                , '\n' <$ PC.char 'n'
+                                , '\r' <$ PC.char 'r'
+                                , '\t' <$ PC.char 't'
+                                , '\v' <$ PC.char 'v'
+                                , '\"' <$ PC.char '"'
+                                , '\'' <$ PC.char '\''
+                                , '\\' <$ PC.char '\\'
+                                , '/'  <$ PC.char '/'
+                                ])
+
+escape :: LBS.ByteString -> Builder
+escape = LBS.foldl' escapeChar mempty
+  where
+    escapeChar b w = b <> (B.lazyByteString $ case w2c w of
+      '\0' -> "\\0"
+      '\b' -> "\\b"
+      '\f' -> "\\f"
+      '\n' -> "\\n"
+      '\r' -> "\\r"
+      '\t' -> "\\t"
+      '\"' -> "\\\""
+      '\\' -> "\\\\"
+      '\SOH' -> "\\u0001"
+      '\STX' -> "\\u0002"
+      '\ETX' -> "\\u0003"
+      '\EOT' -> "\\u0004"
+      '\ENQ' -> "\\u0005"
+      '\ACK' -> "\\u0006"
+      '\BEL' -> "\\u0007"
+      '\VT'  -> "\\u000b"
+      '\SO'  -> "\\u000e"
+      '\SI'  -> "\\u000f"
+      '\DLE' -> "\\u0010"
+      '\DC1' -> "\\u0011"
+      '\DC2' -> "\\u0012"
+      '\DC3' -> "\\u0013"
+      '\DC4' -> "\\u0014"
+      '\NAK' -> "\\u0015"
+      '\SYN' -> "\\u0016"
+      '\ETB' -> "\\u0017"
+      '\CAN' -> "\\u0018"
+      '\EM'  -> "\\u0019"
+      '\SUB' -> "\\u001a"
+      '\ESC' -> "\\u001b"
+      '\FS'  -> "\\u001c"
+      '\GS'  -> "\\u001d"
+      '\RS'  -> "\\u001e"
+      '\US'  -> "\\u001f"
+      '\DEL' -> "\\u007f"
+      _ -> LBS.singleton w)
+
+lexeme :: Parser a -> Parser a
+lexeme = (<* skipSpace)
+
+notChar8 :: Char -> Parser Word8
+notChar8 c = P.satisfy (/= c2w c)
+
+between :: Char -> Char -> Parser a -> Parser a
+between a b p = lexeme (PC.char8 a) *> lexeme p <* lexeme (PC.char8 b)
+
+getTypeName :: ThriftType -> Builder
+getTypeName ty = B.string8 $ case ty of
+  T_STRUCT _ -> "rec"
+  T_MAP _ _  -> "map"
+  T_LIST _   -> "lst"
+  T_SET _    -> "set"
+  T_BOOL     -> "tf"
+  T_BYTE     -> "i8"
+  T_I16      -> "i16"
+  T_I32      -> "i32"
+  T_I64      -> "i64"
+  T_DOUBLE   -> "dbl"
+  T_STRING   -> "str"
+  _ -> error "Unrecognized Type"
+
diff --git a/lib/hs/src/Thrift/Transport.hs b/lib/hs/src/Thrift/Transport.hs
index 3e5f18b..306edc2 100644
--- a/lib/hs/src/Thrift/Transport.hs
+++ b/lib/hs/src/Thrift/Transport.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE DeriveDataTypeable #-}
+{-# LANGUAGE MultiParamTypeClasses #-}
 --
 -- Licensed to the Apache Software Foundation (ASF) under one
 -- or more contributor license agreements. See the NOTICE file
@@ -26,8 +27,9 @@
 
 import Control.Monad ( when )
 import Control.Exception ( Exception, throw )
-
+import Data.Functor ( (<$>) )
 import Data.Typeable ( Typeable )
+import Data.Word
 
 import qualified Data.ByteString.Lazy as LBS
 import Data.Monoid
@@ -36,6 +38,7 @@
     tIsOpen :: a -> IO Bool
     tClose  :: a -> IO ()
     tRead   :: a -> Int -> IO LBS.ByteString
+    tPeek   :: a -> IO (Maybe Word8)
     tWrite  :: a -> LBS.ByteString -> IO ()
     tFlush  :: a -> IO ()
     tReadAll :: a -> Int -> IO LBS.ByteString
@@ -46,8 +49,8 @@
         let rlen = fromIntegral $ LBS.length result
         when (rlen == 0) (throw $ TransportExn "Cannot read. Remote side has closed." TE_UNKNOWN)
         if len <= rlen
-            then return result
-            else (result `mappend`) `fmap` (tReadAll a (len - rlen))
+          then return result
+          else (result `mappend`) <$> tReadAll a (len - rlen)
 
 data TransportExn = TransportExn String TransportExnType
   deriving ( Show, Typeable )
@@ -60,4 +63,3 @@
     | TE_TIMED_OUT
     | TE_END_OF_FILE
       deriving ( Eq, Show, Typeable )
-
diff --git a/lib/hs/src/Thrift/Transport/Empty.hs b/lib/hs/src/Thrift/Transport/Empty.hs
new file mode 100644
index 0000000..47af5fe
--- /dev/null
+++ b/lib/hs/src/Thrift/Transport/Empty.hs
@@ -0,0 +1,36 @@
+{-# LANGUAGE MultiParamTypeClasses #-}
+{-# LANGUAGE OverloadedStrings #-}
+--
+-- Licensed to the Apache Software Foundation (ASF) under one
+-- or more contributor license agreements. See the NOTICE file
+-- distributed with this work for additional information
+-- regarding copyright ownership. The ASF licenses this file
+-- to you under the Apache License, Version 2.0 (the
+-- "License"); you may not use this file except in compliance
+-- with the License. You may obtain a copy of the License at
+--
+--   http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing,
+-- software distributed under the License is distributed on an
+-- "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+-- KIND, either express or implied. See the License for the
+-- specific language governing permissions and limitations
+-- under the License.
+--
+
+module Thrift.Transport.Empty
+       ( EmptyTransport(..)
+       ) where
+
+import Thrift.Transport
+
+data EmptyTransport = EmptyTransport
+
+instance Transport EmptyTransport where
+    tIsOpen = const $ return False
+    tClose  = const $ return ()
+    tRead _ _ = return ""
+    tPeek = const $ return Nothing
+    tWrite _ _ = return ()
+    tFlush = const$ return ()
diff --git a/lib/hs/src/Thrift/Transport/Framed.hs b/lib/hs/src/Thrift/Transport/Framed.hs
index d4feac0..42fc43f 100644
--- a/lib/hs/src/Thrift/Transport/Framed.hs
+++ b/lib/hs/src/Thrift/Transport/Framed.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE FlexibleInstances #-}
+{-# LANGUAGE MultiParamTypeClasses #-}
 --
 -- Licensed to the Apache Software Foundation (ASF) under one
 -- or more contributor license agreements. See the NOTICE file
@@ -25,13 +26,10 @@
     ) where
 
 import Thrift.Transport
+import Thrift.Transport.IOBuffer
 
-import Control.Monad (liftM)
 import Data.Int (Int32)
-import Data.Monoid (mappend, mempty)
-import Control.Concurrent.MVar
 import qualified Data.Binary as B
-import qualified Data.Binary.Builder as BB
 import qualified Data.ByteString.Lazy as LBS
 
 
@@ -65,8 +63,17 @@
                  then tRead trans n
                  else return bs
          else return bs
+    tPeek trans = do
+      mw <- peekBuf (readBuffer trans)
+      case mw of
+        Just _ -> return mw
+        Nothing -> do
+          len <- readFrame trans
+          if len > 0
+             then tPeek trans
+             else return Nothing
 
-    tWrite trans = writeBuf (writeBuffer trans)
+    tWrite = writeBuf . writeBuffer
 
     tFlush trans = do
       bs <- flushBuf (writeBuffer trans)
@@ -84,37 +91,9 @@
   let sz = fromIntegral (B.decode szBs :: Int32)
 
   -- Read the frame and stuff it into the read buffer.
-  bs   <- tRead (wrappedTrans trans) sz
+  bs <- tRead (wrappedTrans trans) sz
   fillBuf (readBuffer trans) bs
 
   -- Return the frame size so that the caller knows whether to expect
   -- something in the read buffer or not.
   return sz
-
-
--- Mini IO buffers (stolen from HttpClient.hs)
-
-type WriteBuffer = MVar (BB.Builder)
-
-newWriteBuffer :: IO WriteBuffer
-newWriteBuffer = newMVar mempty
-
-writeBuf :: WriteBuffer -> LBS.ByteString -> IO ()
-writeBuf w s = modifyMVar_ w $ return . (\builder ->
-                 builder `mappend` (BB.fromLazyByteString s))
-
-flushBuf :: WriteBuffer -> IO (LBS.ByteString)
-flushBuf w = BB.toLazyByteString `liftM` swapMVar w mempty
-
-
-type ReadBuffer = MVar (LBS.ByteString)
-
-newReadBuffer :: IO ReadBuffer
-newReadBuffer = newMVar mempty
-
-fillBuf :: ReadBuffer -> LBS.ByteString -> IO ()
-fillBuf r s = swapMVar r s >> return ()
-
-readBuf :: ReadBuffer -> Int -> IO (LBS.ByteString)
-readBuf r n = modifyMVar r $ return . flipPair . LBS.splitAt (fromIntegral n)
-    where flipPair (a, b) = (b, a)
diff --git a/lib/hs/src/Thrift/Transport/Handle.hs b/lib/hs/src/Thrift/Transport/Handle.hs
index cf4822b..d6cfe31 100644
--- a/lib/hs/src/Thrift/Transport/Handle.hs
+++ b/lib/hs/src/Thrift/Transport/Handle.hs
@@ -1,5 +1,5 @@
 {-# LANGUAGE FlexibleInstances #-}
-{-# LANGUAGE KindSignatures #-}
+{-# LANGUAGE MultiParamTypeClasses #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE TypeSynonymInstances #-}
 {-# OPTIONS_GHC -fno-warn-orphans #-}
@@ -27,10 +27,9 @@
     , HandleSource(..)
     ) where
 
-import Prelude hiding ( catch )
-
 import Control.Exception ( catch, throw )
-import Control.Monad ()
+import Data.ByteString.Internal (c2w)
+import Data.Functor
 
 import Network
 
@@ -44,9 +43,10 @@
 
 instance Transport Handle where
     tIsOpen = hIsOpen
-    tClose h    = hClose h
-    tRead  h n  = LBS.hGet h n `catch` handleEOF
-    tWrite h s  = LBS.hPut h s
+    tClose = hClose
+    tRead h n = LBS.hGet h n `catch` handleEOF mempty
+    tPeek h = (Just . c2w <$> hLookAhead h) `catch` handleEOF Nothing
+    tWrite = LBS.hPut
     tFlush = hFlush
 
 
@@ -62,7 +62,7 @@
     hOpen = uncurry connectTo
 
 
-handleEOF :: forall a (m :: * -> *).(Monoid a, Monad m) => IOError -> m a
-handleEOF e = if isEOFError e
-    then return mempty
+handleEOF :: a -> IOError -> IO a
+handleEOF a e = if isEOFError e
+    then return a
     else throw $ TransportExn "TChannelTransport: Could not read" TE_UNKNOWN
diff --git a/lib/hs/src/Thrift/Transport/HttpClient.hs b/lib/hs/src/Thrift/Transport/HttpClient.hs
index b1b0982..edeb320 100644
--- a/lib/hs/src/Thrift/Transport/HttpClient.hs
+++ b/lib/hs/src/Thrift/Transport/HttpClient.hs
@@ -22,18 +22,16 @@
     ( module Thrift.Transport
     , HttpClient (..)
     , openHttpClient
-    ) where
+) where
 
 import Thrift.Transport
+import Thrift.Transport.IOBuffer
 import Network.URI
 import Network.HTTP hiding (port, host)
 
-import Control.Monad (liftM)
 import Data.Maybe (fromJust)
-import Data.Monoid (mappend, mempty)
+import Data.Monoid (mempty)
 import Control.Exception (throw)
-import Control.Concurrent.MVar
-import qualified Data.Binary.Builder as B
 import qualified Data.ByteString.Lazy as LBS
 
 
@@ -73,11 +71,13 @@
 
 instance Transport HttpClient where
 
-    tClose  = close . hstream
+    tClose = close . hstream
 
-    tRead hclient n = readBuf (readBuffer hclient) n
+    tPeek = peekBuf . readBuffer
 
-    tWrite hclient = writeBuf (writeBuffer hclient)
+    tRead = readBuf . readBuffer
+
+    tWrite = writeBuf . writeBuffer
 
     tFlush hclient = do
       body <- flushBuf $ writeBuffer hclient
@@ -92,36 +92,10 @@
 
       res <- sendHTTP (hstream hclient) request
       case res of
-        Right response -> do
-            fillBuf (readBuffer hclient) (rspBody response)
-        Left _ -> do
+        Right response ->
+          fillBuf (readBuffer hclient) (rspBody response)
+        Left _ ->
             throw $ TransportExn "THttpConnection: HTTP failure from server" TE_UNKNOWN
       return ()
 
     tIsOpen _ = return True
--- Mini IO buffers
-
-type WriteBuffer = MVar (B.Builder)
-
-newWriteBuffer :: IO WriteBuffer
-newWriteBuffer = newMVar mempty
-
-writeBuf :: WriteBuffer -> LBS.ByteString -> IO ()
-writeBuf w s = modifyMVar_ w $ return . (\builder ->
-                 builder `mappend` (B.fromLazyByteString s))
-
-flushBuf :: WriteBuffer -> IO (LBS.ByteString)
-flushBuf w = B.toLazyByteString `liftM` swapMVar w mempty
-
-
-type ReadBuffer = MVar (LBS.ByteString)
-
-newReadBuffer :: IO ReadBuffer
-newReadBuffer = newMVar mempty
-
-fillBuf :: ReadBuffer -> LBS.ByteString -> IO ()
-fillBuf r s = swapMVar r s >> return ()
-
-readBuf :: ReadBuffer -> Int -> IO (LBS.ByteString)
-readBuf r n = modifyMVar r $ return . flipPair . LBS.splitAt (fromIntegral n)
-    where flipPair (a, b) = (b, a)
diff --git a/lib/hs/src/Thrift/Transport/IOBuffer.hs b/lib/hs/src/Thrift/Transport/IOBuffer.hs
new file mode 100644
index 0000000..7ebd7d8
--- /dev/null
+++ b/lib/hs/src/Thrift/Transport/IOBuffer.hs
@@ -0,0 +1,69 @@
+--
+-- Licensed to the Apache Software Foundation (ASF) under one
+-- or more contributor license agreements. See the NOTICE file
+-- distributed with this work for additional information
+-- regarding copyright ownership. The ASF licenses this file
+-- to you under the Apache License, Version 2.0 (the
+-- "License"); you may not use this file except in compliance
+-- with the License. You may obtain a copy of the License at
+--
+--   http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing,
+-- software distributed under the License is distributed on an
+-- "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+-- KIND, either express or implied. See the License for the
+-- specific language governing permissions and limitations
+-- under the License.
+--
+
+module Thrift.Transport.IOBuffer
+       ( WriteBuffer
+       , newWriteBuffer
+       , writeBuf
+       , flushBuf
+       , ReadBuffer
+       , newReadBuffer
+       , fillBuf
+       , readBuf
+       , peekBuf
+       ) where
+
+import Data.ByteString.Lazy.Builder
+import Data.Functor
+import Data.IORef
+import Data.Monoid
+import Data.Word
+
+import qualified Data.ByteString.Lazy as LBS
+
+type WriteBuffer = IORef Builder
+type ReadBuffer = IORef LBS.ByteString
+
+newWriteBuffer :: IO WriteBuffer
+newWriteBuffer = newIORef mempty
+
+writeBuf :: WriteBuffer -> LBS.ByteString -> IO ()
+writeBuf w s = modifyIORef w ( <> lazyByteString s)
+
+flushBuf :: WriteBuffer -> IO LBS.ByteString
+flushBuf w = do
+  buf <- readIORef w
+  writeIORef w mempty
+  return $ toLazyByteString buf
+
+newReadBuffer :: IO ReadBuffer
+newReadBuffer = newIORef mempty
+
+fillBuf :: ReadBuffer -> LBS.ByteString -> IO ()
+fillBuf = writeIORef
+
+readBuf :: ReadBuffer -> Int -> IO LBS.ByteString
+readBuf r n = do
+  bs <- readIORef r
+  let (hd, tl) = LBS.splitAt (fromIntegral n) bs
+  writeIORef r tl
+  return hd
+
+peekBuf :: ReadBuffer -> IO (Maybe Word8)
+peekBuf r = (fmap fst . LBS.uncons) <$> readIORef r
diff --git a/lib/hs/src/Thrift/Types.hs b/lib/hs/src/Thrift/Types.hs
index e917e39..b014ac6 100644
--- a/lib/hs/src/Thrift/Types.hs
+++ b/lib/hs/src/Thrift/Types.hs
@@ -16,10 +16,17 @@
 -- under the License.
 --
 
+{-# OPTIONS_GHC -fno-warn-orphans #-}
+
 module Thrift.Types where
 
 import Data.Foldable (foldl')
 import Data.Hashable ( Hashable, hashWithSalt )
+import Data.Int
+import Test.QuickCheck.Arbitrary
+import Test.QuickCheck.Gen (elements)
+import Data.Text.Lazy (Text)
+import qualified Data.ByteString.Lazy as LBS
 import qualified Data.HashMap.Strict as Map
 import qualified Data.HashSet as Set
 import qualified Data.Vector as Vector
@@ -28,7 +35,95 @@
   hashWithSalt salt = foldl' hashWithSalt salt . Map.toList
 
 instance (Hashable a) => Hashable (Set.HashSet a) where
-  hashWithSalt salt = foldl' hashWithSalt salt
+  hashWithSalt = foldl' hashWithSalt
 
 instance (Hashable a) => Hashable (Vector.Vector a) where
-  hashWithSalt salt = Vector.foldl' hashWithSalt salt
+  hashWithSalt = Vector.foldl' hashWithSalt
+
+
+type TypeMap = Map.HashMap Int16 (Text, ThriftType)
+
+data ThriftVal = TStruct (Map.HashMap Int16 (Text, ThriftVal))
+               | TMap ThriftType ThriftType [(ThriftVal, ThriftVal)]
+               | TList ThriftType [ThriftVal]
+               | TSet ThriftType [ThriftVal]
+               | TBool Bool
+               | TByte Int8
+               | TI16 Int16
+               | TI32 Int32
+               | TI64 Int64
+               | TString LBS.ByteString
+               | TDouble Double
+                 deriving (Eq, Show)
+
+-- Information is needed here for collection types (ie T_STRUCT, T_MAP,
+-- T_LIST, and T_SET) so that we know what types those collections are
+-- parameterized by.  In most protocols, this cannot be discerned directly
+-- from the data being read.
+data ThriftType
+    = T_STOP
+    | T_VOID
+    | T_BOOL
+    | T_BYTE
+    | T_DOUBLE
+    | T_I16
+    | T_I32
+    | T_I64
+    | T_STRING
+    | T_STRUCT TypeMap
+    | T_MAP ThriftType ThriftType
+    | T_SET ThriftType
+    | T_LIST ThriftType
+      deriving ( Eq, Show )
+
+-- NOTE: when using toEnum information about parametized types is NOT preserved.
+-- This design choice is consistent woth the Thrift implementation in other
+-- languages
+instance Enum ThriftType where
+    fromEnum T_STOP       = 0
+    fromEnum T_VOID       = 1
+    fromEnum T_BOOL       = 2
+    fromEnum T_BYTE       = 3
+    fromEnum T_DOUBLE     = 4
+    fromEnum T_I16        = 6
+    fromEnum T_I32        = 8
+    fromEnum T_I64        = 10
+    fromEnum T_STRING     = 11
+    fromEnum (T_STRUCT _) = 12
+    fromEnum (T_MAP _ _)  = 13
+    fromEnum (T_SET _)    = 14
+    fromEnum (T_LIST _)   = 15
+
+    toEnum 0  = T_STOP
+    toEnum 1  = T_VOID
+    toEnum 2  = T_BOOL
+    toEnum 3  = T_BYTE
+    toEnum 4  = T_DOUBLE
+    toEnum 6  = T_I16
+    toEnum 8  = T_I32
+    toEnum 10 = T_I64
+    toEnum 11 = T_STRING
+    toEnum 12 = T_STRUCT Map.empty
+    toEnum 13 = T_MAP T_VOID T_VOID
+    toEnum 14 = T_SET T_VOID
+    toEnum 15 = T_LIST T_VOID
+    toEnum t = error $ "Invalid ThriftType " ++ show t
+
+data MessageType
+    = M_CALL
+    | M_REPLY
+    | M_EXCEPTION
+      deriving ( Eq, Show )
+
+instance Enum MessageType where
+    fromEnum M_CALL      =  1
+    fromEnum M_REPLY     =  2
+    fromEnum M_EXCEPTION =  3
+
+    toEnum 1 = M_CALL
+    toEnum 2 = M_REPLY
+    toEnum 3 = M_EXCEPTION
+    toEnum t = error $ "Invalid MessageType " ++ show t
+
+instance Arbitrary MessageType where
+  arbitrary = elements [M_CALL, M_REPLY, M_EXCEPTION]