module Octane.Utility.CRC
( crc32
) where
import qualified Data.Bits as Bits
import qualified Data.ByteString.Lazy as LazyBytes
import qualified Data.Vector.Unboxed as Vector
import qualified Data.Word as Word
crc32 :: LazyBytes.ByteString -> Word.Word32
crc32 bytes = do
let update = crc32Update crc32Table
let initial = Bits.complement crc32Initial
let crc = LazyBytes.foldl update initial bytes
Bits.complement crc
crc32Update :: Vector.Vector Word.Word32
-> Word.Word32
-> Word.Word8
-> Word.Word32
crc32Update table crc byte = do
let toWord8 =
fromIntegral :: (Integral a) =>
a -> Word.Word8
let toInt =
fromIntegral :: (Integral a) =>
a -> Int
let index = toInt (Bits.xor byte (toWord8 (Bits.shiftR crc 24)))
let left = Vector.unsafeIndex table index
let right = Bits.shiftL crc 8
Bits.xor left right
crc32Initial :: Word.Word32
crc32Initial = 0xefcbf201
crc32Table :: Vector.Vector Word.Word32
crc32Table =
Vector.fromList
[ 0x00000000
, 0x04c11db7
, 0x09823b6e
, 0x0d4326d9
, 0x130476dc
, 0x17c56b6b
, 0x1a864db2
, 0x1e475005
, 0x2608edb8
, 0x22c9f00f
, 0x2f8ad6d6
, 0x2b4bcb61
, 0x350c9b64
, 0x31cd86d3
, 0x3c8ea00a
, 0x384fbdbd
, 0x4c11db70
, 0x48d0c6c7
, 0x4593e01e
, 0x4152fda9
, 0x5f15adac
, 0x5bd4b01b
, 0x569796c2
, 0x52568b75
, 0x6a1936c8
, 0x6ed82b7f
, 0x639b0da6
, 0x675a1011
, 0x791d4014
, 0x7ddc5da3
, 0x709f7b7a
, 0x745e66cd
, 0x9823b6e0
, 0x9ce2ab57
, 0x91a18d8e
, 0x95609039
, 0x8b27c03c
, 0x8fe6dd8b
, 0x82a5fb52
, 0x8664e6e5
, 0xbe2b5b58
, 0xbaea46ef
, 0xb7a96036
, 0xb3687d81
, 0xad2f2d84
, 0xa9ee3033
, 0xa4ad16ea
, 0xa06c0b5d
, 0xd4326d90
, 0xd0f37027
, 0xddb056fe
, 0xd9714b49
, 0xc7361b4c
, 0xc3f706fb
, 0xceb42022
, 0xca753d95
, 0xf23a8028
, 0xf6fb9d9f
, 0xfbb8bb46
, 0xff79a6f1
, 0xe13ef6f4
, 0xe5ffeb43
, 0xe8bccd9a
, 0xec7dd02d
, 0x34867077
, 0x30476dc0
, 0x3d044b19
, 0x39c556ae
, 0x278206ab
, 0x23431b1c
, 0x2e003dc5
, 0x2ac12072
, 0x128e9dcf
, 0x164f8078
, 0x1b0ca6a1
, 0x1fcdbb16
, 0x018aeb13
, 0x054bf6a4
, 0x0808d07d
, 0x0cc9cdca
, 0x7897ab07
, 0x7c56b6b0
, 0x71159069
, 0x75d48dde
, 0x6b93dddb
, 0x6f52c06c
, 0x6211e6b5
, 0x66d0fb02
, 0x5e9f46bf
, 0x5a5e5b08
, 0x571d7dd1
, 0x53dc6066
, 0x4d9b3063
, 0x495a2dd4
, 0x44190b0d
, 0x40d816ba
, 0xaca5c697
, 0xa864db20
, 0xa527fdf9
, 0xa1e6e04e
, 0xbfa1b04b
, 0xbb60adfc
, 0xb6238b25
, 0xb2e29692
, 0x8aad2b2f
, 0x8e6c3698
, 0x832f1041
, 0x87ee0df6
, 0x99a95df3
, 0x9d684044
, 0x902b669d
, 0x94ea7b2a
, 0xe0b41de7
, 0xe4750050
, 0xe9362689
, 0xedf73b3e
, 0xf3b06b3b
, 0xf771768c
, 0xfa325055
, 0xfef34de2
, 0xc6bcf05f
, 0xc27dede8
, 0xcf3ecb31
, 0xcbffd686
, 0xd5b88683
, 0xd1799b34
, 0xdc3abded
, 0xd8fba05a
, 0x690ce0ee
, 0x6dcdfd59
, 0x608edb80
, 0x644fc637
, 0x7a089632
, 0x7ec98b85
, 0x738aad5c
, 0x774bb0eb
, 0x4f040d56
, 0x4bc510e1
, 0x46863638
, 0x42472b8f
, 0x5c007b8a
, 0x58c1663d
, 0x558240e4
, 0x51435d53
, 0x251d3b9e
, 0x21dc2629
, 0x2c9f00f0
, 0x285e1d47
, 0x36194d42
, 0x32d850f5
, 0x3f9b762c
, 0x3b5a6b9b
, 0x0315d626
, 0x07d4cb91
, 0x0a97ed48
, 0x0e56f0ff
, 0x1011a0fa
, 0x14d0bd4d
, 0x19939b94
, 0x1d528623
, 0xf12f560e
, 0xf5ee4bb9
, 0xf8ad6d60
, 0xfc6c70d7
, 0xe22b20d2
, 0xe6ea3d65
, 0xeba91bbc
, 0xef68060b
, 0xd727bbb6
, 0xd3e6a601
, 0xdea580d8
, 0xda649d6f
, 0xc423cd6a
, 0xc0e2d0dd
, 0xcda1f604
, 0xc960ebb3
, 0xbd3e8d7e
, 0xb9ff90c9
, 0xb4bcb610
, 0xb07daba7
, 0xae3afba2
, 0xaafbe615
, 0xa7b8c0cc
, 0xa379dd7b
, 0x9b3660c6
, 0x9ff77d71
, 0x92b45ba8
, 0x9675461f
, 0x8832161a
, 0x8cf30bad
, 0x81b02d74
, 0x857130c3
, 0x5d8a9099
, 0x594b8d2e
, 0x5408abf7
, 0x50c9b640
, 0x4e8ee645
, 0x4a4ffbf2
, 0x470cdd2b
, 0x43cdc09c
, 0x7b827d21
, 0x7f436096
, 0x7200464f
, 0x76c15bf8
, 0x68860bfd
, 0x6c47164a
, 0x61043093
, 0x65c52d24
, 0x119b4be9
, 0x155a565e
, 0x18197087
, 0x1cd86d30
, 0x029f3d35
, 0x065e2082
, 0x0b1d065b
, 0x0fdc1bec
, 0x3793a651
, 0x3352bbe6
, 0x3e119d3f
, 0x3ad08088
, 0x2497d08d
, 0x2056cd3a
, 0x2d15ebe3
, 0x29d4f654
, 0xc5a92679
, 0xc1683bce
, 0xcc2b1d17
, 0xc8ea00a0
, 0xd6ad50a5
, 0xd26c4d12
, 0xdf2f6bcb
, 0xdbee767c
, 0xe3a1cbc1
, 0xe760d676
, 0xea23f0af
, 0xeee2ed18
, 0xf0a5bd1d
, 0xf464a0aa
, 0xf9278673
, 0xfde69bc4
, 0x89b8fd09
, 0x8d79e0be
, 0x803ac667
, 0x84fbdbd0
, 0x9abc8bd5
, 0x9e7d9662
, 0x933eb0bb
, 0x97ffad0c
, 0xafb010b1
, 0xab710d06
, 0xa6322bdf
, 0xa2f33668
, 0xbcb4666d
, 0xb8757bda
, 0xb5365d03
, 0xb1f740b4
]