    {-# LANGUAGE MagicHash     #-}
    {-# LANGUAGE UnboxedTuples #-}
    {-# LANGUAGE BangPatterns  #-}
    module Basement.Base16
        ( unsafeConvertByte
        , hexWord16
        , hexWord32
        , escapeByte
        , Base16Escape(..)
        ) where

    import GHC.Prim
    import GHC.Types
    import GHC.Word
    import Basement.Types.Char7

    data Base16Escape = Base16Escape {-# UNPACK #-} !Char7 {-# UNPACK #-} !Char7

    -- | Convert a byte value in Word# to two Word#s containing
    -- the hexadecimal representation of the Word#
    --
    -- The output words# are guaranteed to be included in the 0 to 2^7-1 range
    --
    -- Note that calling convertByte with a value greater than 256
    -- will cause segfault or other horrible effect.
    unsafeConvertByte :: Word# -> (# Word#, Word# #)
    unsafeConvertByte :: Word# -> (# Word#, Word# #)
    unsafeConvertByte b :: Word#
    b = (# Table -> Word# -> Word#
    r Table
    tableHi Word#
    b, Table -> Word# -> Word#
    r Table
    tableLo Word#
    b #)
      where
        r :: Table -> Word# -> Word#
        r :: Table -> Word# -> Word#
    r (Table !Addr#
    table) index :: Word#
    index = Addr# -> Int# -> Word#
    indexWord8OffAddr# Addr#
    table (Word# -> Int#
    word2Int# Word#
    index)
    {-# INLINE unsafeConvertByte #-}

    escapeByte :: Word8 -> Base16Escape
    escapeByte :: Word8 -> Base16Escape
    escapeByte !(W8# b :: Word#
    b) = Char7 -> Char7 -> Base16Escape
    Base16Escape (Table -> Word# -> Char7
    r Table
    tableHi Word#
    b) (Table -> Word# -> Char7
    r Table
    tableLo Word#
    b)
      where
        r :: Table -> Word# -> Char7
        r :: Table -> Word# -> Char7
    r (Table !Addr#
    table) index :: Word#
    index = Word8 -> Char7
    Char7 (Word# -> Word8
    W8# (Addr# -> Int# -> Word#
    indexWord8OffAddr# Addr#
    table (Word# -> Int#
    word2Int# Word#
    index)))
    {-# INLINE escapeByte #-}

    -- | hex word16
    hexWord16 :: Word16 -> (Char, Char, Char, Char)
    hexWord16 :: Word16 -> (Char, Char, Char, Char)
    hexWord16 (W16# w :: Word#
    w) = (Word# -> Char
    toChar Word#
    w1,Word# -> Char
    toChar Word#
    w2,Word# -> Char
    toChar Word#
    w3,Word# -> Char
    toChar Word#
    w4)
      where
        toChar :: Word# -> Char
        toChar :: Word# -> Char
    toChar c :: Word#
    c = Char# -> Char
    C# (Int# -> Char#
    chr# (Word# -> Int#
    word2Int# Word#
    c))
        !(# w1 :: Word#
    w1, w2 :: Word#
    w2 #) = Word# -> (# Word#, Word# #)
    unsafeConvertByte (Word# -> Int# -> Word#
    uncheckedShiftRL# Word#
    w 8#)
        !(# w3 :: Word#
    w3, w4 :: Word#
    w4 #) = Word# -> (# Word#, Word# #)
    unsafeConvertByte (Word# -> Word# -> Word#
    and# Word#
    w 0xff##)

    -- | hex word32
    hexWord32 :: Word32 -> (Char, Char, Char, Char, Char, Char, Char, Char)
    hexWord32 :: Word32 -> (Char, Char, Char, Char, Char, Char, Char, Char)
    hexWord32 (W32# w :: Word#
    w) = (Word# -> Char
    toChar Word#
    w1,Word# -> Char
    toChar Word#
    w2,Word# -> Char
    toChar Word#
    w3,Word# -> Char
    toChar Word#
    w4
                         ,Word# -> Char
    toChar Word#
    w5,Word# -> Char
    toChar Word#
    w6,Word# -> Char
    toChar Word#
    w7,Word# -> Char
    toChar Word#
    w8)
      where
        toChar :: Word# -> Char
        toChar :: Word# -> Char
    toChar c :: Word#
    c = Char# -> Char
    C# (Int# -> Char#
    chr# (Word# -> Int#
    word2Int# Word#
    c))
        !(# w1 :: Word#
    w1, w2 :: Word#
    w2 #) = Word# -> (# Word#, Word# #)
    unsafeConvertByte (Word# -> Int# -> Word#
    uncheckedShiftRL# Word#
    w 24#)
        !(# w3 :: Word#
    w3, w4 :: Word#
    w4 #) = Word# -> (# Word#, Word# #)
    unsafeConvertByte (Word# -> Word# -> Word#
    and# (Word# -> Int# -> Word#
    uncheckedShiftRL# Word#
    w 16#) 0xff##)
        !(# w5 :: Word#
    w5, w6 :: Word#
    w6 #) = Word# -> (# Word#, Word# #)
    unsafeConvertByte (Word# -> Word# -> Word#
    and# (Word# -> Int# -> Word#
    uncheckedShiftRL# Word#
    w 8#) 0xff##)
        !(# w7 :: Word#
    w7, w8 :: Word#
    w8 #) = Word# -> (# Word#, Word# #)
    unsafeConvertByte (Word# -> Word# -> Word#
    and# Word#
    w 0xff##)

    data Table = Table Addr#

    tableLo:: Table
    tableLo :: Table
    tableLo = Addr# -> Table
    Table
        "0123456789abcdef0123456789abcdef\
        \0123456789abcdef0123456789abcdef\
        \0123456789abcdef0123456789abcdef\
        \0123456789abcdef0123456789abcdef\
        \0123456789abcdef0123456789abcdef\
        \0123456789abcdef0123456789abcdef\
        \0123456789abcdef0123456789abcdef\
        \0123456789abcdef0123456789abcdef"#

    tableHi :: Table
    tableHi :: Table
    tableHi = Addr# -> Table
    Table
        "00000000000000001111111111111111\
        \22222222222222223333333333333333\
        \44444444444444445555555555555555\
        \66666666666666667777777777777777\
        \88888888888888889999999999999999\
        \aaaaaaaaaaaaaaaabbbbbbbbbbbbbbbb\
        \ccccccccccccccccdddddddddddddddd\
        \eeeeeeeeeeeeeeeeffffffffffffffff"#