{-# LANGUAGE BangPatterns #-}
{-# LANGUAGE CPP          #-}
{-# LANGUAGE MultiWayIf   #-}

module Data.Aeson.Parser.UnescapePure
  ( unescapeText
  ) where

import           Control.Exception        (throwIO, try)
import           Data.Bits                (shiftL, shiftR, (.&.), (.|.))
import           Data.ByteString          (ByteString)
import           Data.Text                (Text)
import           Data.Text.Encoding.Error (UnicodeException (..))
import           Data.Text.Unsafe         (unsafeDupablePerformIO)
import           Data.Word                (Word32, Word8)
import           Foreign.ForeignPtr       (withForeignPtr)
import           Foreign.Ptr              (Ptr, plusPtr)
import           Foreign.Storable         (peek)

import qualified Data.Primitive           as P
import qualified Data.Text.Array          as T
import qualified Data.Text.Internal       as T

import Data.Aeson.Internal.ByteString

#if !MIN_VERSION_text(2,0,0)
import           Data.Word                (Word16)
#endif


unescapeText :: ByteString -> Either UnicodeException Text
unescapeText :: ByteString -> Either UnicodeException Text
unescapeText = IO (Either UnicodeException Text) -> Either UnicodeException Text
forall a. IO a -> a
unsafeDupablePerformIO (IO (Either UnicodeException Text) -> Either UnicodeException Text)
-> (ByteString -> IO (Either UnicodeException Text))
-> ByteString
-> Either UnicodeException Text
forall b c a. (b -> c) -> (a -> b) -> a -> c
. IO Text -> IO (Either UnicodeException Text)
forall e a. Exception e => IO a -> IO (Either e a)
try (IO Text -> IO (Either UnicodeException Text))
-> (ByteString -> IO Text)
-> ByteString
-> IO (Either UnicodeException Text)
forall b c a. (b -> c) -> (a -> b) -> a -> c
. ByteString -> IO Text
unescapeTextIO

throwDecodeError :: IO a
throwDecodeError :: IO a
throwDecodeError =
  let desc :: [Char]
desc = [Char]
"Data.Text.Internal.Encoding.decodeUtf8: Invalid UTF-8 stream"
   in UnicodeException -> IO a
forall e a. Exception e => e -> IO a
throwIO ([Char] -> Maybe Word8 -> UnicodeException
DecodeError [Char]
desc Maybe Word8
forall a. Maybe a
Nothing)

-------------------------------------------------------------------------------
-- unescapeTextIO
-------------------------------------------------------------------------------

-- This function is generated using staged-streams
-- See: https://github.com/phadej/staged/blob/master/staged-streams-unicode/src/Unicode/JSON.hs
--
-- Because @aeson@ better to not use template-haskell itself,
-- we dump the splice and prettify it by hand a bit.
--
unescapeTextIO :: ByteString -> IO Text

#if MIN_VERSION_text(2,0,0)

unescapeTextIO :: ByteString -> IO Text
unescapeTextIO ByteString
bs = ByteString -> (ForeignPtr Word8 -> Int -> IO Text) -> IO Text
forall r. ByteString -> (ForeignPtr Word8 -> Int -> r) -> r
withBS ByteString
bs ((ForeignPtr Word8 -> Int -> IO Text) -> IO Text)
-> (ForeignPtr Word8 -> Int -> IO Text) -> IO Text
forall a b. (a -> b) -> a -> b
$ \ForeignPtr Word8
fptr Int
len ->
  ForeignPtr Word8 -> (Ptr Word8 -> IO Text) -> IO Text
forall a b. ForeignPtr a -> (Ptr a -> IO b) -> IO b
withForeignPtr ForeignPtr Word8
fptr ((Ptr Word8 -> IO Text) -> IO Text)
-> (Ptr Word8 -> IO Text) -> IO Text
forall a b. (a -> b) -> a -> b
$ \Ptr Word8
begin -> do
    let end :: Ptr Word8
        end :: Ptr Word8
end = Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
begin Int
len

    MutablePrimArray RealWorld Word8
arr <- Int -> IO (MutablePrimArray (PrimState IO) Word8)
forall (m :: * -> *) a.
(PrimMonad m, Prim a) =>
Int -> m (MutablePrimArray (PrimState m) a)
P.newPrimArray Int
len

    let write3bytes :: Int -> Word8 -> Word8 -> Word8 -> Ptr Word8 -> IO Text
        write3bytes :: Int -> Word8 -> Word8 -> Word8 -> Ptr Word8 -> IO Text
write3bytes !Int
out !Word8
b1 !Word8
b2 !Word8
b3 !Ptr Word8
inp = do
          MutablePrimArray (PrimState IO) Word8 -> Int -> Word8 -> IO ()
forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word8
MutablePrimArray (PrimState IO) Word8
arr Int
out Word8
b1
          Int -> Word8 -> Word8 -> Ptr Word8 -> IO Text
write2bytes (Int
out Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
1) Word8
b2 Word8
b3 Ptr Word8
inp

        write2bytes :: Int -> Word8 -> Word8 -> Ptr Word8 -> IO Text
        write2bytes :: Int -> Word8 -> Word8 -> Ptr Word8 -> IO Text
write2bytes !Int
out !Word8
b1 !Word8
b2 !Ptr Word8
inp = do
          MutablePrimArray (PrimState IO) Word8 -> Int -> Word8 -> IO ()
forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word8
MutablePrimArray (PrimState IO) Word8
arr Int
out Word8
b1
          Int -> Word8 -> Ptr Word8 -> IO Text
write1byte (Int
out Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
1) Word8
b2 Ptr Word8
inp

        write1byte :: Int -> Word8 -> Ptr Word8 -> IO Text
        write1byte :: Int -> Word8 -> Ptr Word8 -> IO Text
write1byte !Int
out !Word8
b1 !Ptr Word8
inp = do
          MutablePrimArray (PrimState IO) Word8 -> Int -> Word8 -> IO ()
forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word8
MutablePrimArray (PrimState IO) Word8
arr Int
out Word8
b1
          Int -> Ptr Word8 -> IO Text
state_start (Int
out Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
1) Ptr Word8
inp

        writeCodePoint :: Int -> Ptr Word8 -> Word32 -> IO Text
        writeCodePoint :: Int -> Ptr Word8 -> Word32 -> IO Text
writeCodePoint !Int
out !Ptr Word8
inp !Word32
acc
          | Word32
acc Word32 -> Word32 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word32
127 = do
            MutablePrimArray (PrimState IO) Word8 -> Int -> Word8 -> IO ()
forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word8
MutablePrimArray (PrimState IO) Word8
arr Int
out (Word32 -> Word8
forall a b. (Integral a, Num b) => a -> b
fromIntegral Word32
acc :: Word8)
            Int -> Ptr Word8 -> IO Text
state_start (Int
out Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
1) (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)

          | Word32
acc Word32 -> Word32 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word32
2047 = do
            let b1 :: Word8
b1 = Word32 -> Word8
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word32 -> Int -> Word32
forall a. Bits a => a -> Int -> a
shiftR Word32
acc Int
6 Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.|. Word32
192) :: Word8
            let b2 :: Word8
b2 = Word32 -> Word8
forall a b. (Integral a, Num b) => a -> b
fromIntegral ((Word32
acc Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.&. Word32
63) Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.|. Word32
128) :: Word8
            MutablePrimArray (PrimState IO) Word8 -> Int -> Word8 -> IO ()
forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word8
MutablePrimArray (PrimState IO) Word8
arr Int
out Word8
b1
            Int -> Word8 -> Ptr Word8 -> IO Text
write1byte (Int
out Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
1) Word8
b2 (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)

          | Word32
acc Word32 -> Word32 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word32
65535 = do
            let b1 :: Word8
b1 = Word32 -> Word8
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word32 -> Int -> Word32
forall a. Bits a => a -> Int -> a
shiftR Word32
acc Int
12 Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.|. Word32
224) :: Word8
            let b2 :: Word8
b2 = Word32 -> Word8
forall a b. (Integral a, Num b) => a -> b
fromIntegral ((Word32 -> Int -> Word32
forall a. Bits a => a -> Int -> a
shiftR Word32
acc Int
6 Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.&. Word32
63) Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.|.  Word32
128) :: Word8
            let b3 :: Word8
b3 = Word32 -> Word8
forall a b. (Integral a, Num b) => a -> b
fromIntegral ((Word32
acc Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.&. Word32
63) Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.|. Word32
128) :: Word8
            MutablePrimArray (PrimState IO) Word8 -> Int -> Word8 -> IO ()
forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word8
MutablePrimArray (PrimState IO) Word8
arr Int
out Word8
b1
            Int -> Word8 -> Word8 -> Ptr Word8 -> IO Text
write2bytes (Int
out Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
1) Word8
b2 Word8
b3 (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)

          | Bool
otherwise = do
            let b1 :: Word8
b1 = Word32 -> Word8
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word32 -> Int -> Word32
forall a. Bits a => a -> Int -> a
shiftR Word32
acc Int
18 Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.|. Word32
240) :: Word8
            let b2 :: Word8
b2 = Word32 -> Word8
forall a b. (Integral a, Num b) => a -> b
fromIntegral ((Word32 -> Int -> Word32
forall a. Bits a => a -> Int -> a
shiftR Word32
acc Int
12 Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.&. Word32
63) Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.|. Word32
128) :: Word8
            let b3 :: Word8
b3 = Word32 -> Word8
forall a b. (Integral a, Num b) => a -> b
fromIntegral ((Word32 -> Int -> Word32
forall a. Bits a => a -> Int -> a
shiftR Word32
acc Int
6 Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.&. Word32
63) Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.|. Word32
128) :: Word8
            let b4 :: Word8
b4 = Word32 -> Word8
forall a b. (Integral a, Num b) => a -> b
fromIntegral ((Word32
acc Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.&. Word32
63) Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.|. Word32
128) :: Word8
            MutablePrimArray (PrimState IO) Word8 -> Int -> Word8 -> IO ()
forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word8
MutablePrimArray (PrimState IO) Word8
arr Int
out Word8
b1
            Int -> Word8 -> Word8 -> Word8 -> Ptr Word8 -> IO Text
write3bytes (Int
out Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
1) Word8
b2 Word8
b3 Word8
b4 (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)

        state_sudone :: Int -> Ptr Word8 -> Word32 -> Word32 -> IO Text
        state_sudone :: Int -> Ptr Word8 -> Word32 -> Word32 -> IO Text
state_sudone !Int
out !Ptr Word8
inp !Word32
hi !Word32
lo
          | Word32
56320 Word32 -> Word32 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word32
lo, Word32
lo Word32 -> Word32 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word32
57343
          = Int -> Ptr Word8 -> Word32 -> IO Text
writeCodePoint Int
out Ptr Word8
inp (Word32
65536 Word32 -> Word32 -> Word32
forall a. Num a => a -> a -> a
+ (Word32 -> Int -> Word32
forall a. Bits a => a -> Int -> a
shiftL (Word32
hi Word32 -> Word32 -> Word32
forall a. Num a => a -> a -> a
- Word32
55296) Int
10 Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.|.  (Word32
lo Word32 -> Word32 -> Word32
forall a. Num a => a -> a -> a
- Word32
56320)))
          
          | Bool
otherwise
          = IO Text
forall a. IO a
throwDecodeError

        state_su4 :: Int -> Ptr Word8 -> Word32 -> Word32 -> IO Text
        state_su4 :: Int -> Ptr Word8 -> Word32 -> Word32 -> IO Text
state_su4 !Int
out !Ptr Word8
inp !Word32
hi !Word32
acc
          | Ptr Word8
inp Ptr Word8 -> Ptr Word8 -> Bool
forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = IO Text
forall a. IO a
throwDecodeError
          | Bool
otherwise = do
            Word8
w8 <- Ptr Word8 -> IO Word8
forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            if | Word8
48 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
57 ->
                 Int -> Ptr Word8 -> Word32 -> Word32 -> IO Text
state_sudone Int
out Ptr Word8
inp Word32
hi (Word32 -> Int -> Word32
forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.|. Word8 -> Word32
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 Word8 -> Word8 -> Word8
forall a. Num a => a -> a -> a
- Word8
48))
               | Word8
65 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
70 ->
                 Int -> Ptr Word8 -> Word32 -> Word32 -> IO Text
state_sudone Int
out Ptr Word8
inp Word32
hi (Word32 -> Int -> Word32
forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.|. Word8 -> Word32
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 Word8 -> Word8 -> Word8
forall a. Num a => a -> a -> a
- Word8
55))
               | Word8
97 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
102 ->
                 Int -> Ptr Word8 -> Word32 -> Word32 -> IO Text
state_sudone Int
out Ptr Word8
inp Word32
hi (Word32 -> Int -> Word32
forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.|. Word8 -> Word32
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 Word8 -> Word8 -> Word8
forall a. Num a => a -> a -> a
- Word8
87))
               | Bool
otherwise ->
                 IO Text
forall a. IO a
throwDecodeError

        state_su3 :: Int -> Ptr Word8 -> Word32 -> Word32 -> IO Text
        state_su3 :: Int -> Ptr Word8 -> Word32 -> Word32 -> IO Text
state_su3 !Int
out !Ptr Word8
inp !Word32
hi !Word32
acc
          | Ptr Word8
inp Ptr Word8 -> Ptr Word8 -> Bool
forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = IO Text
forall a. IO a
throwDecodeError
          | Bool
otherwise = do
            Word8
w8 <- Ptr Word8 -> IO Word8
forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            if | Word8
48 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
57 ->
                 Int -> Ptr Word8 -> Word32 -> Word32 -> IO Text
state_su4 Int
out (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) Word32
hi (Word32 -> Int -> Word32
forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.|. Word8 -> Word32
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 Word8 -> Word8 -> Word8
forall a. Num a => a -> a -> a
- Word8
48))
               | Word8
65 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
70 ->
                 Int -> Ptr Word8 -> Word32 -> Word32 -> IO Text
state_su4 Int
out (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) Word32
hi (Word32 -> Int -> Word32
forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.|. Word8 -> Word32
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 Word8 -> Word8 -> Word8
forall a. Num a => a -> a -> a
- Word8
55))
               | Word8
97 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
102 ->
                 Int -> Ptr Word8 -> Word32 -> Word32 -> IO Text
state_su4 Int
out (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) Word32
hi (Word32 -> Int -> Word32
forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.|. Word8 -> Word32
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 Word8 -> Word8 -> Word8
forall a. Num a => a -> a -> a
- Word8
87))
               | Bool
otherwise ->
                 IO Text
forall a. IO a
throwDecodeError

        state_su2 :: Int -> Ptr Word8 -> Word32 -> Word32 -> IO Text
        state_su2 :: Int -> Ptr Word8 -> Word32 -> Word32 -> IO Text
state_su2 !Int
out !Ptr Word8
inp !Word32
hi !Word32
acc
          | Ptr Word8
inp Ptr Word8 -> Ptr Word8 -> Bool
forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = IO Text
forall a. IO a
throwDecodeError
          | Bool
otherwise = do
            Word8
w8 <- Ptr Word8 -> IO Word8
forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            if | Word8
48 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
57 -> 
                 Int -> Ptr Word8 -> Word32 -> Word32 -> IO Text
state_su3 Int
out (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) Word32
hi (Word32 -> Int -> Word32
forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.|. Word8 -> Word32
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 Word8 -> Word8 -> Word8
forall a. Num a => a -> a -> a
- Word8
48))
               | Word8
65 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
70 ->
                 Int -> Ptr Word8 -> Word32 -> Word32 -> IO Text
state_su3 Int
out (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) Word32
hi (Word32 -> Int -> Word32
forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.|. Word8 -> Word32
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 Word8 -> Word8 -> Word8
forall a. Num a => a -> a -> a
- Word8
55))
               | Word8
97 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
102 ->
                 Int -> Ptr Word8 -> Word32 -> Word32 -> IO Text
state_su3 Int
out (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) Word32
hi (Word32 -> Int -> Word32
forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.|. Word8 -> Word32
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 Word8 -> Word8 -> Word8
forall a. Num a => a -> a -> a
- Word8
87))
               | Bool
otherwise ->
                 IO Text
forall a. IO a
throwDecodeError

        state_su1 :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_su1 :: Int -> Ptr Word8 -> Word32 -> IO Text
state_su1 !Int
out !Ptr Word8
inp !Word32
hi
          | Ptr Word8
inp Ptr Word8 -> Ptr Word8 -> Bool
forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = IO Text
forall a. IO a
throwDecodeError
          | Bool
otherwise = do
            Word8
w8 <- Ptr Word8 -> IO Word8
forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            if | Word8
48 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
57 ->
                 Int -> Ptr Word8 -> Word32 -> Word32 -> IO Text
state_su2 Int
out (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) Word32
hi (Word8 -> Word32
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 Word8 -> Word8 -> Word8
forall a. Num a => a -> a -> a
- Word8
48))
               | Word8
65 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
70 ->
                 Int -> Ptr Word8 -> Word32 -> Word32 -> IO Text
state_su2 Int
out (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) Word32
hi (Word8 -> Word32
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 Word8 -> Word8 -> Word8
forall a. Num a => a -> a -> a
- Word8
55))
               | Word8
97 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
102 ->
                 Int -> Ptr Word8 -> Word32 -> Word32 -> IO Text
state_su2 Int
out (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) Word32
hi (Word8 -> Word32
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 Word8 -> Word8 -> Word8
forall a. Num a => a -> a -> a
- Word8
87))
               | Bool
otherwise ->
                 IO Text
forall a. IO a
throwDecodeError

        state_su :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_su :: Int -> Ptr Word8 -> Word32 -> IO Text
state_su !Int
out !Ptr Word8
inp !Word32
hi
          | Ptr Word8
inp Ptr Word8 -> Ptr Word8 -> Bool
forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = IO Text
forall a. IO a
throwDecodeError
          | Bool
otherwise = do
            Word8
w8 <- Ptr Word8 -> IO Word8
forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            case Word8
w8 of
              Word8
117 -> Int -> Ptr Word8 -> Word32 -> IO Text
state_su1 Int
out (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) Word32
hi
              Word8
_   -> IO Text
forall a. IO a
throwDecodeError

        state_ss :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_ss :: Int -> Ptr Word8 -> Word32 -> IO Text
state_ss !Int
out !Ptr Word8
inp !Word32
hi
          | Ptr Word8
inp Ptr Word8 -> Ptr Word8 -> Bool
forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = IO Text
forall a. IO a
throwDecodeError
          | Bool
otherwise = do
            Word8
w8 <- Ptr Word8 -> IO Word8
forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            case Word8
w8 of
              Word8
92 -> Int -> Ptr Word8 -> Word32 -> IO Text
state_su Int
out (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) Word32
hi
              Word8
_  -> IO Text
forall a. IO a
throwDecodeError

        state_udone :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_udone :: Int -> Ptr Word8 -> Word32 -> IO Text
state_udone !Int
out !Ptr Word8
inp !Word32
acc
          | Word32
acc Word32 -> Word32 -> Bool
forall a. Ord a => a -> a -> Bool
< Word32
55296 Bool -> Bool -> Bool
|| Word32
acc Word32 -> Word32 -> Bool
forall a. Ord a => a -> a -> Bool
> Word32
57343 =
            Int -> Ptr Word8 -> Word32 -> IO Text
writeCodePoint Int
out Ptr Word8
inp Word32
acc

          | Word32
acc Word32 -> Word32 -> Bool
forall a. Ord a => a -> a -> Bool
< Word32
56320 =
            Int -> Ptr Word8 -> Word32 -> IO Text
state_ss Int
out (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) Word32
acc

          | Bool
otherwise =
            IO Text
forall a. IO a
throwDecodeError

        state_u4 :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_u4 :: Int -> Ptr Word8 -> Word32 -> IO Text
state_u4 !Int
out !Ptr Word8
inp !Word32
acc
          | Ptr Word8
inp Ptr Word8 -> Ptr Word8 -> Bool
forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = IO Text
forall a. IO a
throwDecodeError
          | Bool
otherwise = do
            Word8
w8 <- Ptr Word8 -> IO Word8
forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            if | Word8
48 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
57 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_udone Int
out Ptr Word8
inp (Word32 -> Int -> Word32
forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.|. Word8 -> Word32
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 Word8 -> Word8 -> Word8
forall a. Num a => a -> a -> a
- Word8
48))
               | Word8
65 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
70 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_udone Int
out Ptr Word8
inp (Word32 -> Int -> Word32
forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.|. Word8 -> Word32
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 Word8 -> Word8 -> Word8
forall a. Num a => a -> a -> a
- Word8
55))
               | Word8
97 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
102 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_udone Int
out Ptr Word8
inp (Word32 -> Int -> Word32
forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.|. Word8 -> Word32
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 Word8 -> Word8 -> Word8
forall a. Num a => a -> a -> a
- Word8
87))
               | Bool
otherwise ->
                 IO Text
forall a. IO a
throwDecodeError

        state_u3 :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_u3 :: Int -> Ptr Word8 -> Word32 -> IO Text
state_u3 !Int
out !Ptr Word8
inp !Word32
acc
          | Ptr Word8
inp Ptr Word8 -> Ptr Word8 -> Bool
forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = IO Text
forall a. IO a
throwDecodeError
          | Bool
otherwise = do
            Word8
w8 <- Ptr Word8 -> IO Word8
forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            if | Word8
48 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
57 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_u4 Int
out (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) (Word32 -> Int -> Word32
forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.|. Word8 -> Word32
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 Word8 -> Word8 -> Word8
forall a. Num a => a -> a -> a
- Word8
48))
               | Word8
65 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
70 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_u4 Int
out (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) (Word32 -> Int -> Word32
forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.|. Word8 -> Word32
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 Word8 -> Word8 -> Word8
forall a. Num a => a -> a -> a
- Word8
55))
               | Word8
97 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
102 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_u4 Int
out (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) (Word32 -> Int -> Word32
forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.|. Word8 -> Word32
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 Word8 -> Word8 -> Word8
forall a. Num a => a -> a -> a
- Word8
87))
               | Bool
otherwise ->
                 IO Text
forall a. IO a
throwDecodeError

        state_u2 :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_u2 :: Int -> Ptr Word8 -> Word32 -> IO Text
state_u2 !Int
out !Ptr Word8
inp !Word32
acc
          | Ptr Word8
inp Ptr Word8 -> Ptr Word8 -> Bool
forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = IO Text
forall a. IO a
throwDecodeError
          | Bool
otherwise = do
            Word8
w8 <- Ptr Word8 -> IO Word8
forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            if | Word8
48 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
57 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_u3 Int
out (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) (Word32 -> Int -> Word32
forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.|. Word8 -> Word32
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 Word8 -> Word8 -> Word8
forall a. Num a => a -> a -> a
- Word8
48))
               | Word8
65 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
70 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_u3 Int
out (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) (Word32 -> Int -> Word32
forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.|. Word8 -> Word32
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 Word8 -> Word8 -> Word8
forall a. Num a => a -> a -> a
- Word8
55))
               | Word8
97 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
102 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_u3 Int
out (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) (Word32 -> Int -> Word32
forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.|. Word8 -> Word32
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 Word8 -> Word8 -> Word8
forall a. Num a => a -> a -> a
- Word8
87))
               | Bool
otherwise ->
                 IO Text
forall a. IO a
throwDecodeError

        state_u1 :: Int -> Ptr Word8 -> IO Text
        state_u1 :: Int -> Ptr Word8 -> IO Text
state_u1 !Int
out !Ptr Word8
inp
          | Ptr Word8
inp Ptr Word8 -> Ptr Word8 -> Bool
forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = IO Text
forall a. IO a
throwDecodeError
          | Bool
otherwise = do
            Word8
w8 <- Ptr Word8 -> IO Word8
forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            if | Word8
48 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
57 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_u2 Int
out (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) (Word8 -> Word32
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 Word8 -> Word8 -> Word8
forall a. Num a => a -> a -> a
- Word8
48))
               | Word8
65 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
70 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_u2 Int
out (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) (Word8 -> Word32
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 Word8 -> Word8 -> Word8
forall a. Num a => a -> a -> a
- Word8
55))
               | Word8
97 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
102 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_u2 Int
out (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) (Word8 -> Word32
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 Word8 -> Word8 -> Word8
forall a. Num a => a -> a -> a
- Word8
87))
               | Bool
otherwise ->
                 IO Text
forall a. IO a
throwDecodeError

        state_escape :: Int -> Ptr Word8 -> IO Text
        state_escape :: Int -> Ptr Word8 -> IO Text
state_escape !Int
out !Ptr Word8
inp
          | Ptr Word8
inp Ptr Word8 -> Ptr Word8 -> Bool
forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = IO Text
forall a. IO a
throwDecodeError
          | Bool
otherwise  = do
            Word8
w8 <- Ptr Word8 -> IO Word8
forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            case Word8
w8 of
              Word8
34 -> do
                MutablePrimArray (PrimState IO) Word8 -> Int -> Word8 -> IO ()
forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word8
MutablePrimArray (PrimState IO) Word8
arr Int
out Word8
34
                Int -> Ptr Word8 -> IO Text
state_start (Int
out Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
1) (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)

              Word8
92 -> do
                MutablePrimArray (PrimState IO) Word8 -> Int -> Word8 -> IO ()
forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word8
MutablePrimArray (PrimState IO) Word8
arr Int
out Word8
92
                Int -> Ptr Word8 -> IO Text
state_start (Int
out Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
1) (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)

              Word8
47 -> do
                MutablePrimArray (PrimState IO) Word8 -> Int -> Word8 -> IO ()
forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word8
MutablePrimArray (PrimState IO) Word8
arr Int
out Word8
47
                Int -> Ptr Word8 -> IO Text
state_start (Int
out Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
1) (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)

              Word8
98 -> do
                MutablePrimArray (PrimState IO) Word8 -> Int -> Word8 -> IO ()
forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word8
MutablePrimArray (PrimState IO) Word8
arr Int
out Word8
8
                Int -> Ptr Word8 -> IO Text
state_start (Int
out Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
1) (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)

              Word8
102 -> do
                MutablePrimArray (PrimState IO) Word8 -> Int -> Word8 -> IO ()
forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word8
MutablePrimArray (PrimState IO) Word8
arr Int
out Word8
12
                Int -> Ptr Word8 -> IO Text
state_start (Int
out Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
1) (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)

              Word8
110 -> do
                MutablePrimArray (PrimState IO) Word8 -> Int -> Word8 -> IO ()
forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word8
MutablePrimArray (PrimState IO) Word8
arr Int
out Word8
10
                Int -> Ptr Word8 -> IO Text
state_start (Int
out Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
1) (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)

              Word8
114 -> do
                MutablePrimArray (PrimState IO) Word8 -> Int -> Word8 -> IO ()
forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word8
MutablePrimArray (PrimState IO) Word8
arr Int
out Word8
13
                Int -> Ptr Word8 -> IO Text
state_start (Int
out Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
1) (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)

              Word8
116 -> do
                MutablePrimArray (PrimState IO) Word8 -> Int -> Word8 -> IO ()
forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word8
MutablePrimArray (PrimState IO) Word8
arr Int
out Word8
9
                Int -> Ptr Word8 -> IO Text
state_start (Int
out Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
1) (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)

              Word8
117 ->
                Int -> Ptr Word8 -> IO Text
state_u1 Int
out (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)

              Word8
_ -> IO Text
forall a. IO a
throwDecodeError

        state_input4c :: Int -> Ptr Word8 -> Word8 -> Word8 -> Word8 -> IO Text
        state_input4c :: Int -> Ptr Word8 -> Word8 -> Word8 -> Word8 -> IO Text
state_input4c !Int
out !Ptr Word8
inp !Word8
b1 !Word8
b2 !Word8
b3
          | Ptr Word8
inp Ptr Word8 -> Ptr Word8 -> Bool
forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = IO Text
forall a. IO a
throwDecodeError
          | Bool
otherwise  = do
            Word8
w8 <- Ptr Word8 -> IO Word8
forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            if | (Word8
w8 Word8 -> Word8 -> Word8
forall a. Bits a => a -> a -> a
.&. Word8
192) Word8 -> Word8 -> Bool
forall a. Eq a => a -> a -> Bool
== Word8
128
               , let acc :: Word32
acc    = Word32 -> Int -> Word32
forall a. Bits a => a -> Int -> a
shiftL (Word8 -> Word32
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
b1 Word8 -> Word8 -> Word8
forall a. Bits a => a -> a -> a
.&. Word8
7)) Int
18
               , let acc' :: Word32
acc'   = Word32
acc Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.|. Word32 -> Int -> Word32
forall a. Bits a => a -> Int -> a
shiftL (Word8 -> Word32
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
b2 Word8 -> Word8 -> Word8
forall a. Bits a => a -> a -> a
.&. Word8
63)) Int
12
               , let acc'' :: Word32
acc''  = Word32
acc' Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.|. Word32 -> Int -> Word32
forall a. Bits a => a -> Int -> a
shiftL (Word8 -> Word32
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
b3 Word8 -> Word8 -> Word8
forall a. Bits a => a -> a -> a
.&. Word8
63)) Int
6
               , let acc''' :: Word32
acc''' = Word32
acc'' Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.|. Word8 -> Word32
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 Word8 -> Word8 -> Word8
forall a. Bits a => a -> a -> a
.&. Word8
63) :: Word32
               , Word32
acc''' Word32 -> Word32 -> Bool
forall a. Ord a => a -> a -> Bool
>= Word32
65536 Bool -> Bool -> Bool
&& Word32
acc''' Word32 -> Word32 -> Bool
forall a. Ord a => a -> a -> Bool
< Word32
1114112 -> do
                 MutablePrimArray (PrimState IO) Word8 -> Int -> Word8 -> IO ()
forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word8
MutablePrimArray (PrimState IO) Word8
arr Int
out Word8
b1
                 Int -> Word8 -> Word8 -> Word8 -> Ptr Word8 -> IO Text
write3bytes (Int
out Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
1) Word8
b2 Word8
b3 Word8
w8 (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)

               | Bool
otherwise ->
                 IO Text
forall a. IO a
throwDecodeError

        state_input4b :: Int -> Ptr Word8 -> Word8 -> Word8 -> IO Text
        state_input4b :: Int -> Ptr Word8 -> Word8 -> Word8 -> IO Text
state_input4b !Int
out !Ptr Word8
inp !Word8
b1 !Word8
b2
          | Ptr Word8
inp Ptr Word8 -> Ptr Word8 -> Bool
forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = IO Text
forall a. IO a
throwDecodeError
          | Bool
otherwise  = do
            Word8
w8 <- Ptr Word8 -> IO Word8
forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            if | (Word8
w8 Word8 -> Word8 -> Word8
forall a. Bits a => a -> a -> a
.&. Word8
192) Word8 -> Word8 -> Bool
forall a. Eq a => a -> a -> Bool
== Word8
128 ->
                 Int -> Ptr Word8 -> Word8 -> Word8 -> Word8 -> IO Text
state_input4c Int
out (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) Word8
b1 Word8
b2 Word8
w8

               | Bool
otherwise ->
                 IO Text
forall a. IO a
throwDecodeError

        state_input4 :: Int -> Ptr Word8 -> Word8 -> IO Text
        state_input4 :: Int -> Ptr Word8 -> Word8 -> IO Text
state_input4 !Int
out !Ptr Word8
inp !Word8
b1
          | Ptr Word8
inp Ptr Word8 -> Ptr Word8 -> Bool
forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = IO Text
forall a. IO a
throwDecodeError
          | Bool
otherwise  = do
            Word8
w8 <- Ptr Word8 -> IO Word8
forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            if | (Word8
w8 Word8 -> Word8 -> Word8
forall a. Bits a => a -> a -> a
.&. Word8
192) Word8 -> Word8 -> Bool
forall a. Eq a => a -> a -> Bool
== Word8
128 ->
                 Int -> Ptr Word8 -> Word8 -> Word8 -> IO Text
state_input4b Int
out (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) Word8
b1 Word8
w8

               | Bool
otherwise ->
                 IO Text
forall a. IO a
throwDecodeError

        state_input3b :: Int -> Ptr Word8 -> Word8 -> Word8 -> IO Text
        state_input3b :: Int -> Ptr Word8 -> Word8 -> Word8 -> IO Text
state_input3b !Int
out !Ptr Word8
inp !Word8
b1 !Word8
b2
          | Ptr Word8
inp Ptr Word8 -> Ptr Word8 -> Bool
forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = IO Text
forall a. IO a
throwDecodeError
          | Bool
otherwise  = do
            Word8
w8 <- Ptr Word8 -> IO Word8
forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            if | (Word8
w8 Word8 -> Word8 -> Word8
forall a. Bits a => a -> a -> a
.&. Word8
192) Word8 -> Word8 -> Bool
forall a. Eq a => a -> a -> Bool
== Word8
128
               , let acc :: Word32
acc   = Word32 -> Int -> Word32
forall a. Bits a => a -> Int -> a
shiftL (Word8 -> Word32
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
b1 Word8 -> Word8 -> Word8
forall a. Bits a => a -> a -> a
.&. Word8
15)) Int
12
               , let acc' :: Word32
acc'  = Word32
acc Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.|.  Word32 -> Int -> Word32
forall a. Bits a => a -> Int -> a
shiftL (Word8 -> Word32
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
b2 Word8 -> Word8 -> Word8
forall a. Bits a => a -> a -> a
.&. Word8
63)) Int
6
               , let acc'' :: Word32
acc'' = Word32
acc' Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.|. Word8 -> Word32
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 Word8 -> Word8 -> Word8
forall a. Bits a => a -> a -> a
.&. Word8
63) :: Word32
               , (Word32
acc'' Word32 -> Word32 -> Bool
forall a. Ord a => a -> a -> Bool
>= Word32
2048 Bool -> Bool -> Bool
&& Word32
acc'' Word32 -> Word32 -> Bool
forall a. Ord a => a -> a -> Bool
< Word32
55296) Bool -> Bool -> Bool
|| Word32
acc'' Word32 -> Word32 -> Bool
forall a. Ord a => a -> a -> Bool
> Word32
57343 -> do
                 MutablePrimArray (PrimState IO) Word8 -> Int -> Word8 -> IO ()
forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word8
MutablePrimArray (PrimState IO) Word8
arr Int
out Word8
b1
                 Int -> Word8 -> Word8 -> Ptr Word8 -> IO Text
write2bytes (Int
out Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
1) Word8
b2 Word8
w8 (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)

               | Bool
otherwise ->
                 IO Text
forall a. IO a
throwDecodeError

        state_input3 :: Int -> Ptr Word8 -> Word8 -> IO Text
        state_input3 :: Int -> Ptr Word8 -> Word8 -> IO Text
state_input3 !Int
out !Ptr Word8
inp !Word8
b1
          | Ptr Word8
inp Ptr Word8 -> Ptr Word8 -> Bool
forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = IO Text
forall a. IO a
throwDecodeError
          | Bool
otherwise  = do
            Word8
w8 <- Ptr Word8 -> IO Word8
forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            if | (Word8
w8 Word8 -> Word8 -> Word8
forall a. Bits a => a -> a -> a
.&. Word8
192) Word8 -> Word8 -> Bool
forall a. Eq a => a -> a -> Bool
== Word8
128 ->
                 Int -> Ptr Word8 -> Word8 -> Word8 -> IO Text
state_input3b Int
out (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) Word8
b1 Word8
w8

               | Bool
otherwise ->
                 IO Text
forall a. IO a
throwDecodeError

        state_input2 :: Int -> Ptr Word8 -> Word8 -> IO Text
        state_input2 :: Int -> Ptr Word8 -> Word8 -> IO Text
state_input2 !Int
out !Ptr Word8
inp !Word8
b1
          | Ptr Word8
inp Ptr Word8 -> Ptr Word8 -> Bool
forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = IO Text
forall a. IO a
throwDecodeError
          | Bool
otherwise  = do
            Word8
w8 <- Ptr Word8 -> IO Word8
forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            if | (Word8
w8 Word8 -> Word8 -> Word8
forall a. Bits a => a -> a -> a
.&. Word8
192) Word8 -> Word8 -> Bool
forall a. Eq a => a -> a -> Bool
== Word8
128,
                 let acc :: Word32
acc = Word32 -> Int -> Word32
forall a. Bits a => a -> Int -> a
shiftL (Word8 -> Word32
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
b1 Word8 -> Word8 -> Word8
forall a. Bits a => a -> a -> a
.&. Word8
63)) Int
6 :: Word32
                     acc' :: Word32
acc' = Word32
acc Word32 -> Word32 -> Word32
forall a. Bits a => a -> a -> a
.|. Word8 -> Word32
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 Word8 -> Word8 -> Word8
forall a. Bits a => a -> a -> a
.&. Word8
63) :: Word32
               , Word32
acc' Word32 -> Word32 -> Bool
forall a. Ord a => a -> a -> Bool
>= Word32
128 -> do
                 MutablePrimArray (PrimState IO) Word8 -> Int -> Word8 -> IO ()
forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word8
MutablePrimArray (PrimState IO) Word8
arr Int
out Word8
b1
                 Int -> Word8 -> Ptr Word8 -> IO Text
write1byte (Int
out Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
1) Word8
w8 (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)

               | Bool
otherwise ->
                 IO Text
forall a. IO a
throwDecodeError

        state_start :: Int -> Ptr Word8 -> IO Text
        state_start :: Int -> Ptr Word8 -> IO Text
state_start !Int
out !Ptr Word8
inp
          | Ptr Word8
inp Ptr Word8 -> Ptr Word8 -> Bool
forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = do
            MutablePrimArray (PrimState IO) Word8 -> Int -> IO ()
forall (m :: * -> *) a.
(PrimMonad m, Prim a) =>
MutablePrimArray (PrimState m) a -> Int -> m ()
P.shrinkMutablePrimArray MutablePrimArray RealWorld Word8
MutablePrimArray (PrimState IO) Word8
arr Int
out
            PrimArray Word8
frozenArr <- MutablePrimArray (PrimState IO) Word8 -> IO (PrimArray Word8)
forall (m :: * -> *) a.
PrimMonad m =>
MutablePrimArray (PrimState m) a -> m (PrimArray a)
P.unsafeFreezePrimArray MutablePrimArray RealWorld Word8
MutablePrimArray (PrimState IO) Word8
arr
            Text -> IO Text
forall (m :: * -> *) a. Monad m => a -> m a
return (Text -> IO Text) -> Text -> IO Text
forall a b. (a -> b) -> a -> b
$ case PrimArray Word8
frozenArr of
              P.PrimArray ByteArray#
ba -> Array -> Int -> Int -> Text
T.Text (ByteArray# -> Array
T.ByteArray ByteArray#
ba) Int
0 Int
out

          | Bool
otherwise = do
            Word8
w8 <- Ptr Word8 -> IO Word8
forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            if | Word8
w8 Word8 -> Word8 -> Bool
forall a. Eq a => a -> a -> Bool
== Word8
92 -> Int -> Ptr Word8 -> IO Text
state_escape Int
out (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)
               | Word8
w8 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
< Word8
128 -> do
                 MutablePrimArray (PrimState IO) Word8 -> Int -> Word8 -> IO ()
forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word8
MutablePrimArray (PrimState IO) Word8
arr Int
out Word8
w8
                 Int -> Ptr Word8 -> IO Text
state_start (Int
out Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
1) (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)

               | Word8
w8 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
< Word8
192 -> IO Text
forall a. IO a
throwDecodeError
               | Word8
w8 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
< Word8
224 -> Int -> Ptr Word8 -> Word8 -> IO Text
state_input2 Int
out (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) Word8
w8
               | Word8
w8 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
< Word8
240 -> Int -> Ptr Word8 -> Word8 -> IO Text
state_input3 Int
out (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) Word8
w8
               | Word8
w8 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
< Word8
248 -> Int -> Ptr Word8 -> Word8 -> IO Text
state_input4 Int
out (Ptr Word8 -> Int -> Ptr Word8
forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) Word8
w8

               | Bool
otherwise -> IO Text
forall a. IO a
throwDecodeError

    -- start the state machine
    Int -> Ptr Word8 -> IO Text
state_start (Int
0 :: Int) Ptr Word8
begin
#else

unescapeTextIO bs = withBS bs $ \fptr len ->
  withForeignPtr fptr $ \begin -> do
    let end :: Ptr Word8
        end = plusPtr begin len

    arr <- P.newPrimArray len

    let writeLowSurrogate :: Int -> Word16 -> Ptr Word8 -> IO Text
        writeLowSurrogate !out !w16 !inp = do
          P.writePrimArray arr out w16
          state_start (out + 1) inp

        state_sudone :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_sudone !out !inp !lo
          | 56320 <= lo, lo <= 57343 = do
            P.writePrimArray arr out (fromIntegral lo)
            state_start (out + 1) (plusPtr inp 1)

          | otherwise =
            throwDecodeError

        state_su4 :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_su4 !out !inp !acc
          | inp == end = throwDecodeError
          | otherwise = do
            w8 <- peek inp
            if | 48 <= w8, w8 <= 57 ->
                 state_sudone out inp (shiftL acc 4 .|. fromIntegral (w8 - 48))
               | 65 <= w8, w8 <= 70 ->
                 state_sudone out inp (shiftL acc 4 .|. fromIntegral (w8 - 55))
               | 97 <= w8, w8 <= 102 ->
                 state_sudone out inp (shiftL acc 4 .|. fromIntegral (w8 - 87))
               | otherwise ->
                 throwDecodeError

        state_su3 :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_su3 !out !inp  !acc
          | inp == end = throwDecodeError
          | otherwise = do
            w8 <- peek inp
            if | 48 <= w8, w8 <= 57 ->
                 state_su4 out (plusPtr inp 1) (shiftL acc 4 .|. fromIntegral (w8 - 48))
               | 65 <= w8, w8 <= 70 ->
                 state_su4 out (plusPtr inp 1) (shiftL acc 4 .|. fromIntegral (w8 - 55))
               | 97 <= w8, w8 <= 102 ->
                 state_su4 out (plusPtr inp 1) (shiftL acc 4 .|. fromIntegral (w8 - 87))
               | otherwise -> throwDecodeError

        state_su2 :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_su2 !out !inp !acc
          | inp == end = throwDecodeError
          | otherwise = do
            w8 <- peek inp
            if | 48 <= w8, w8 <= 57 ->
                 state_su3 out (plusPtr inp 1) (shiftL acc 4 .|. fromIntegral (w8 - 48))
               | 65 <= w8, w8 <= 70 ->
                 state_su3 out (plusPtr inp 1) (shiftL acc 4 .|. fromIntegral (w8 - 55))
               | 97 <= w8, w8 <= 102 ->
                 state_su3 out (plusPtr inp 1) (shiftL acc 4 .|. fromIntegral (w8 - 87))
               | otherwise ->
                 throwDecodeError

        state_su1 :: Int -> Ptr Word8 -> IO Text
        state_su1 !out !inp
          | inp == end = throwDecodeError
          | otherwise = do
            w8 <- peek inp
            if | 48 <= w8, w8 <= 57 ->
                 state_su2 out (plusPtr inp 1) (fromIntegral (w8 - 48))
               | 65 <= w8, w8 <= 70 ->
                 state_su2 out (plusPtr inp 1) (fromIntegral (w8 - 55))
               | 97 <= w8, w8 <= 102 ->
                 state_su2 out (plusPtr inp 1) (fromIntegral (w8 - 87))
               | otherwise ->
                 throwDecodeError

        -- high surrogate u
        state_su :: Int -> Ptr Word8 -> IO Text
        state_su !out !inp
          | inp == end = throwDecodeError
          | otherwise = do
            w8 <- peek inp
            case w8 of
              117 -> state_su1 out (plusPtr inp 1)
              _   -> throwDecodeError

        -- high surrogate slash
        state_ss :: Int -> Ptr Word8 -> IO Text
        state_ss !out !inp
          | inp == end = throwDecodeError
          | otherwise = do
            w8 <- peek inp
            case w8 of
              92 -> state_su out (plusPtr inp 1)
              _  -> throwDecodeError

        state_udone :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_udone !out !inp !acc
          -- we know that codepoint in acc is in BMP
          | acc < 55296 || acc > 57343 = do
            P.writePrimArray arr out (fromIntegral acc)
            state_start (out + 1) (plusPtr inp 1)

          -- hi surrogate,
          -- we write it immediately (UTF16 as an output!)
          | acc < 56320 = do
            P.writePrimArray arr out (fromIntegral acc)
            state_ss (out + 1) (plusPtr inp 1)

          | otherwise =
            throwDecodeError

        state_u4 :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_u4 !out !inp !acc
          | inp == end = throwDecodeError
          | otherwise = do
            w8 <- peek inp
            if | 48 <= w8, w8 <= 57 ->
                 state_udone out inp (shiftL acc 4 .|. fromIntegral (w8 - 48))
               | 65 <= w8, w8 <= 70 ->
                 state_udone out inp (shiftL acc 4 .|. fromIntegral (w8 - 55))
               | 97 <= w8, w8 <= 102 ->
                 state_udone out inp (shiftL acc 4 .|. fromIntegral (w8 - 87))
               | otherwise ->
                 throwDecodeError

        state_u3 :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_u3 !out !inp !acc
          | inp == end = throwDecodeError
          | otherwise = do
            w8 <- peek inp
            if | 48 <= w8, w8 <= 57 ->
                 state_u4 out (plusPtr inp 1) (shiftL acc 4 .|. fromIntegral (w8 - 48))
               | 65 <= w8, w8 <= 70 ->
                 state_u4 out (plusPtr inp 1) (shiftL acc 4 .|. fromIntegral (w8 - 55))
               | 97 <= w8, w8 <= 102 ->
                 state_u4 out (plusPtr inp 1) (shiftL acc 4 .|. fromIntegral (w8 - 87))
               | otherwise ->
                 throwDecodeError

        state_u2 :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_u2 !out !inp !acc
          | inp == end = throwDecodeError
          | otherwise = do
            w8 <- peek inp
            if | 48 <= w8, w8 <= 57 ->
                 state_u3 out (plusPtr inp 1) (shiftL acc 4 .|. fromIntegral (w8 - 48))
               | 65 <= w8, w8 <= 70 ->
                 state_u3 out (plusPtr inp 1) (shiftL acc 4 .|. fromIntegral (w8 - 55))
               | 97 <= w8, w8 <= 102 ->
                 state_u3 out (plusPtr inp 1) (shiftL acc 4 .|. fromIntegral (w8 - 87))
               | otherwise ->
                 throwDecodeError

        state_u1 :: Int -> Ptr Word8 -> IO Text
        state_u1 !out !inp
          | inp == end = throwDecodeError
          | otherwise = do
            w8 <- peek inp
            if | 48 <= w8, w8 <= 57 ->
                 state_u2 out (plusPtr inp 1) (fromIntegral (w8 - 48))
               | 65 <= w8, w8 <= 70 ->
                 state_u2 out (plusPtr inp 1) (fromIntegral (w8 - 55))
               | 97 <= w8, w8 <= 102 ->
                 state_u2 out (plusPtr inp 1) (fromIntegral (w8 - 87))
               | otherwise ->
                 throwDecodeError

        state_escape :: Int -> Ptr Word8 -> IO Text
        state_escape out inp
          | inp == end = throwDecodeError
          | otherwise = do
            w8 <- peek inp
            case w8 of
              34 -> do
                P.writePrimArray arr out 34
                state_start (out + 1) (plusPtr inp 1)

              92 -> do
                P.writePrimArray arr out 92
                state_start (out + 1) (plusPtr inp 1)

              47 -> do
                P.writePrimArray arr out 47
                state_start (out + 1) (plusPtr inp 1)

              98 -> do
                P.writePrimArray arr out 8
                state_start (out + 1) (plusPtr inp 1)

              102 -> do
                P.writePrimArray arr out 12
                state_start (out + 1) (plusPtr inp 1)

              110 -> do
                P.writePrimArray arr out 10
                state_start (out + 1) (plusPtr inp 1)

              114 -> do
                P.writePrimArray arr out 13
                state_start (out + 1) (plusPtr inp 1)

              116 -> do
                P.writePrimArray arr out 9
                state_start (out + 1) (plusPtr inp 1)

              117 ->
                state_u1 out (plusPtr inp 1)

              _ -> throwDecodeError

        state_input4c :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_input4c !out !inp !acc
          | inp == end = throwDecodeError
          | otherwise = do
            w8 <- peek inp
            if | (w8 .&. 0xc0) == 0x80
               , let acc' = acc .|.  fromIntegral (w8 .&. 63)
               , acc' >= 65536 && acc' < 1114112 ->
                 if {- -- | acc' < 65536 -> do
                       --   P.writePrimArray arr out (fromIntegral acc' :: Word16)
                       --   state_start (out + 1) (plusPtr inp 1) -}
                    | otherwise -> do
                      let u = acc' - 65536
                          hi = fromIntegral (55296 + shiftR u 10) :: Word16
                          lo = fromIntegral (56320 + (u .&. 1023)) :: Word16
                      P.writePrimArray arr out hi
                      writeLowSurrogate (out + 1) lo (plusPtr inp 1)

               | otherwise -> throwDecodeError

        state_input4b :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_input4b !out !inp !acc
          | inp == end = throwDecodeError
          | otherwise = do
            w8 <- peek inp
            if | (w8 .&. 0xc0) == 0x80 ->
                 state_input4c out (plusPtr inp 1) (acc .|. shiftL (fromIntegral (w8 .&. 63)) 6)

               | otherwise -> throwDecodeError

        state_input4 :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_input4 !out !inp !acc
          | inp == end = throwDecodeError
          | otherwise = do
            w8 <- peek inp
            if | (w8 .&. 0xc0) == 0x80 ->
                 state_input4b out (plusPtr inp 1) (acc .|. shiftL (fromIntegral (w8 .&. 63)) 12)

               | otherwise -> throwDecodeError

        state_input3b :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_input3b !out !inp !acc
          | inp == end = throwDecodeError
          | otherwise = do
            w8 <- peek inp
            if | (w8 .&. 0xc0) == 0x80
               , let acc' = acc .|.  fromIntegral (w8 .&. 63)
               , (acc' >= 2048 && acc' < 55296) || acc' > 57343 ->
                 if | acc' < 65536 -> do
                      P.writePrimArray arr out (fromIntegral acc')
                      state_start (out + 1) (plusPtr inp 1)

                    | otherwise -> do
                      let u = acc' - 65536
                          hi = fromIntegral (55296 + shiftR u 10) :: Word16
                          lo = fromIntegral (56320 + (u .&. 1023)) :: Word16
                      P.writePrimArray arr out hi
                      writeLowSurrogate (out + 1) lo (plusPtr inp 1)

               | otherwise -> throwDecodeError

        state_input3 :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_input3 !out !inp !acc
          | inp == end = throwDecodeError
          | otherwise = do
            w8 <- peek inp
            if | (w8 .&. 0xc0) == 0x80 ->
                 state_input3b out (plusPtr inp 1) (acc .|. shiftL (fromIntegral (w8 .&. 63)) 6)
               | otherwise -> throwDecodeError

        state_input2 :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_input2 !out !inp !acc
          | inp == end = throwDecodeError
          | otherwise = do
            w8 <- peek inp
            if | (w8 .&. 0xc0) == 0x80
               , let acc' = acc .|. fromIntegral (w8 .&. 63)
               , acc' >= 0x80 -> do
                 P.writePrimArray arr out (fromIntegral acc' :: Word16)
                 state_start (out + 1) (plusPtr inp 1)

               | otherwise -> throwDecodeError

        state_start :: Int -> Ptr Word8 -> IO Text
        state_start !out !inp
          | inp == end = do
            P.shrinkMutablePrimArray arr out
            frozenArr <- P.unsafeFreezePrimArray arr
            return $ case frozenArr of
              P.PrimArray ba -> T.Text (T.Array ba) 0 out

          | otherwise = do
            w8 <- peek inp
            if | w8 == 92 -> state_escape out (plusPtr inp 1)
               | w8 < 0x80 -> do
                  P.writePrimArray arr out (fromIntegral w8 :: Word16)
                  state_start (out + 1) (plusPtr inp 1)

               | w8 < 0xc0 -> throwDecodeError
               | w8 < 224 -> state_input2 out (plusPtr inp 1) (shiftL (fromIntegral (w8 .&. 63)) 6)
               | w8 < 240 -> state_input3 out (plusPtr inp 1) (shiftL (fromIntegral (w8 .&. 15)) 12)
               | w8 < 248 -> state_input4 out (plusPtr inp 1) (shiftL (fromIntegral (w8 .&.  7)) 18)
               | otherwise -> throwDecodeError

    -- start the state machine
    state_start (0 :: Int) begin

#endif