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|
{-# 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 = unsafeDupablePerformIO . try . unescapeTextIO
throwDecodeError :: IO a
throwDecodeError =
let desc = "Data.Text.Internal.Encoding.decodeUtf8: Invalid UTF-8 stream"
in throwIO (DecodeError desc 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 bs = withBS bs $ \fptr len ->
withForeignPtr fptr $ \begin -> do
let end :: Ptr Word8
end = plusPtr begin len
arr <- P.newPrimArray len
let write3bytes :: Int -> Word8 -> Word8 -> Word8 -> Ptr Word8 -> IO Text
write3bytes !out !b1 !b2 !b3 !inp = do
P.writePrimArray arr out b1
write2bytes (out + 1) b2 b3 inp
write2bytes :: Int -> Word8 -> Word8 -> Ptr Word8 -> IO Text
write2bytes !out !b1 !b2 !inp = do
P.writePrimArray arr out b1
write1byte (out + 1) b2 inp
write1byte :: Int -> Word8 -> Ptr Word8 -> IO Text
write1byte !out !b1 !inp = do
P.writePrimArray arr out b1
state_start (out + 1) inp
writeCodePoint :: Int -> Ptr Word8 -> Word32 -> IO Text
writeCodePoint !out !inp !acc
| acc <= 127 = do
P.writePrimArray arr out (fromIntegral acc :: Word8)
state_start (out + 1) (plusPtr inp 1)
| acc <= 2047 = do
let b1 = fromIntegral (shiftR acc 6 .|. 192) :: Word8
let b2 = fromIntegral ((acc .&. 63) .|. 128) :: Word8
P.writePrimArray arr out b1
write1byte (out + 1) b2 (plusPtr inp 1)
| acc <= 65535 = do
let b1 = fromIntegral (shiftR acc 12 .|. 224) :: Word8
let b2 = fromIntegral ((shiftR acc 6 .&. 63) .|. 128) :: Word8
let b3 = fromIntegral ((acc .&. 63) .|. 128) :: Word8
P.writePrimArray arr out b1
write2bytes (out + 1) b2 b3 (plusPtr inp 1)
| otherwise = do
let b1 = fromIntegral (shiftR acc 18 .|. 240) :: Word8
let b2 = fromIntegral ((shiftR acc 12 .&. 63) .|. 128) :: Word8
let b3 = fromIntegral ((shiftR acc 6 .&. 63) .|. 128) :: Word8
let b4 = fromIntegral ((acc .&. 63) .|. 128) :: Word8
P.writePrimArray arr out b1
write3bytes (out + 1) b2 b3 b4 (plusPtr inp 1)
state_sudone :: Int -> Ptr Word8 -> Word32 -> Word32 -> IO Text
state_sudone !out !inp !hi !lo
| 56320 <= lo, lo <= 57343
= writeCodePoint out inp (65536 + (shiftL (hi - 55296) 10 .|. (lo - 56320)))
| otherwise
= throwDecodeError
state_su4 :: Int -> Ptr Word8 -> Word32 -> Word32 -> IO Text
state_su4 !out !inp !hi !acc
| inp == end = throwDecodeError
| otherwise = do
w8 <- peek inp
if | 48 <= w8, w8 <= 57 ->
state_sudone out inp hi (shiftL acc 4 .|. fromIntegral (w8 - 48))
| 65 <= w8, w8 <= 70 ->
state_sudone out inp hi (shiftL acc 4 .|. fromIntegral (w8 - 55))
| 97 <= w8, w8 <= 102 ->
state_sudone out inp hi (shiftL acc 4 .|. fromIntegral (w8 - 87))
| otherwise ->
throwDecodeError
state_su3 :: Int -> Ptr Word8 -> Word32 -> Word32 -> IO Text
state_su3 !out !inp !hi !acc
| inp == end = throwDecodeError
| otherwise = do
w8 <- peek inp
if | 48 <= w8, w8 <= 57 ->
state_su4 out (plusPtr inp 1) hi (shiftL acc 4 .|. fromIntegral (w8 - 48))
| 65 <= w8, w8 <= 70 ->
state_su4 out (plusPtr inp 1) hi (shiftL acc 4 .|. fromIntegral (w8 - 55))
| 97 <= w8, w8 <= 102 ->
state_su4 out (plusPtr inp 1) hi (shiftL acc 4 .|. fromIntegral (w8 - 87))
| otherwise ->
throwDecodeError
state_su2 :: Int -> Ptr Word8 -> Word32 -> Word32 -> IO Text
state_su2 !out !inp !hi !acc
| inp == end = throwDecodeError
| otherwise = do
w8 <- peek inp
if | 48 <= w8, w8 <= 57 ->
state_su3 out (plusPtr inp 1) hi (shiftL acc 4 .|. fromIntegral (w8 - 48))
| 65 <= w8, w8 <= 70 ->
state_su3 out (plusPtr inp 1) hi (shiftL acc 4 .|. fromIntegral (w8 - 55))
| 97 <= w8, w8 <= 102 ->
state_su3 out (plusPtr inp 1) hi (shiftL acc 4 .|. fromIntegral (w8 - 87))
| otherwise ->
throwDecodeError
state_su1 :: Int -> Ptr Word8 -> Word32 -> IO Text
state_su1 !out !inp !hi
| inp == end = throwDecodeError
| otherwise = do
w8 <- peek inp
if | 48 <= w8, w8 <= 57 ->
state_su2 out (plusPtr inp 1) hi (fromIntegral (w8 - 48))
| 65 <= w8, w8 <= 70 ->
state_su2 out (plusPtr inp 1) hi (fromIntegral (w8 - 55))
| 97 <= w8, w8 <= 102 ->
state_su2 out (plusPtr inp 1) hi (fromIntegral (w8 - 87))
| otherwise ->
throwDecodeError
state_su :: Int -> Ptr Word8 -> Word32 -> IO Text
state_su !out !inp !hi
| inp == end = throwDecodeError
| otherwise = do
w8 <- peek inp
case w8 of
117 -> state_su1 out (plusPtr inp 1) hi
_ -> throwDecodeError
state_ss :: Int -> Ptr Word8 -> Word32 -> IO Text
state_ss !out !inp !hi
| inp == end = throwDecodeError
| otherwise = do
w8 <- peek inp
case w8 of
92 -> state_su out (plusPtr inp 1) hi
_ -> throwDecodeError
state_udone :: Int -> Ptr Word8 -> Word32 -> IO Text
state_udone !out !inp !acc
| acc < 55296 || acc > 57343 =
writeCodePoint out inp acc
| acc < 56320 =
state_ss out (plusPtr inp 1) acc
| 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 -> Word8 -> Word8 -> Word8 -> IO Text
state_input4c !out !inp !b1 !b2 !b3
| inp == end = throwDecodeError
| otherwise = do
w8 <- peek inp
if | (w8 .&. 192) == 128
, let acc = shiftL (fromIntegral (b1 .&. 7)) 18
, let acc' = acc .|. shiftL (fromIntegral (b2 .&. 63)) 12
, let acc'' = acc' .|. shiftL (fromIntegral (b3 .&. 63)) 6
, let acc''' = acc'' .|. fromIntegral (w8 .&. 63) :: Word32
, acc''' >= 65536 && acc''' < 1114112 -> do
P.writePrimArray arr out b1
write3bytes (out + 1) b2 b3 w8 (plusPtr inp 1)
| otherwise ->
throwDecodeError
state_input4b :: Int -> Ptr Word8 -> Word8 -> Word8 -> IO Text
state_input4b !out !inp !b1 !b2
| inp == end = throwDecodeError
| otherwise = do
w8 <- peek inp
if | (w8 .&. 192) == 128 ->
state_input4c out (plusPtr inp 1) b1 b2 w8
| otherwise ->
throwDecodeError
state_input4 :: Int -> Ptr Word8 -> Word8 -> IO Text
state_input4 !out !inp !b1
| inp == end = throwDecodeError
| otherwise = do
w8 <- peek inp
if | (w8 .&. 192) == 128 ->
state_input4b out (plusPtr inp 1) b1 w8
| otherwise ->
throwDecodeError
state_input3b :: Int -> Ptr Word8 -> Word8 -> Word8 -> IO Text
state_input3b !out !inp !b1 !b2
| inp == end = throwDecodeError
| otherwise = do
w8 <- peek inp
if | (w8 .&. 192) == 128
, let acc = shiftL (fromIntegral (b1 .&. 15)) 12
, let acc' = acc .|. shiftL (fromIntegral (b2 .&. 63)) 6
, let acc'' = acc' .|. fromIntegral (w8 .&. 63) :: Word32
, (acc'' >= 2048 && acc'' < 55296) || acc'' > 57343 -> do
P.writePrimArray arr out b1
write2bytes (out + 1) b2 w8 (plusPtr inp 1)
| otherwise ->
throwDecodeError
state_input3 :: Int -> Ptr Word8 -> Word8 -> IO Text
state_input3 !out !inp !b1
| inp == end = throwDecodeError
| otherwise = do
w8 <- peek inp
if | (w8 .&. 192) == 128 ->
state_input3b out (plusPtr inp 1) b1 w8
| otherwise ->
throwDecodeError
state_input2 :: Int -> Ptr Word8 -> Word8 -> IO Text
state_input2 !out !inp !b1
| inp == end = throwDecodeError
| otherwise = do
w8 <- peek inp
if | (w8 .&. 192) == 128,
let acc = shiftL (fromIntegral (b1 .&. 63)) 6 :: Word32
acc' = acc .|. fromIntegral (w8 .&. 63) :: Word32
, acc' >= 128 -> do
P.writePrimArray arr out b1
write1byte (out + 1) w8 (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.ByteArray ba) 0 out
| otherwise = do
w8 <- peek inp
if | w8 == 92 -> state_escape out (plusPtr inp 1)
| w8 < 128 -> do
P.writePrimArray arr out w8
state_start (out + 1) (plusPtr inp 1)
| w8 < 192 -> throwDecodeError
| w8 < 224 -> state_input2 out (plusPtr inp 1) w8
| w8 < 240 -> state_input3 out (plusPtr inp 1) w8
| w8 < 248 -> state_input4 out (plusPtr inp 1) w8
| otherwise -> throwDecodeError
-- start the state machine
state_start (0 :: Int) 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
|
