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fix byteswap32 to work on Word32# instead of Word# (with compat for ghc < 9.2)

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Vincent Hanquez 2022-03-13 20:49:11 +08:00
parent cca5d72bf1
commit 20b194fc97
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GPG Key ID: 4CA4A32D1A6F50E2
1 changed files with 13 additions and 12 deletions
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25
Crypto/Internal/CompatPrim.hs
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@ -23,15 +23,21 @@ module Crypto.Internal.CompatPrim
, convert4To32
) where
import GHC.Prim
#if !defined(ARCH_IS_LITTLE_ENDIAN) && !defined(ARCH_IS_BIG_ENDIAN)
import Data.Memory.Endian (getSystemEndianness, Endianness(..))
#endif
#if __GLASGOW_HASKELL__ >= 902
import GHC.Prim
#else
import GHC.Prim hiding (Word32#)
type Word32# = Word#
#endif
-- | Byteswap Word# to or from Big Endian
--
-- On a big endian machine, this function is a nop.
be32Prim :: Word# -> Word#
be32Prim :: Word32# -> Word32#
#ifdef ARCH_IS_LITTLE_ENDIAN
be32Prim = byteswap32Prim
#elif defined(ARCH_IS_BIG_ENDIAN)
@ -43,7 +49,7 @@ be32Prim w = if getSystemEndianness == LittleEndian then byteswap32Prim w else w
-- | Byteswap Word# to or from Little Endian
--
-- On a little endian machine, this function is a nop.
le32Prim :: Word# -> Word#
le32Prim :: Word32# -> Word32#
#ifdef ARCH_IS_LITTLE_ENDIAN
le32Prim w = w
#elif defined(ARCH_IS_BIG_ENDIAN)
@ -54,16 +60,11 @@ le32Prim w = if getSystemEndianness == LittleEndian then w else byteswap32Prim w
-- | Simple compatibility for byteswap the lower 32 bits of a Word#
-- at the primitive level
byteswap32Prim :: Word# -> Word#
#if __GLASGOW_HASKELL__ >= 708
byteswap32Prim w = byteSwap32# w
byteswap32Prim :: Word32# -> Word32#
#if __GLASGOW_HASKELL__ >= 902
byteswap32Prim w = wordToWord32# (byteSwap32# (word32ToWord# w))
#else
byteswap32Prim w =
let !a = uncheckedShiftL# w 24#
!b = and# (uncheckedShiftL# w 8#) 0x00ff0000##
!c = and# (uncheckedShiftRL# w 8#) 0x0000ff00##
!d = and# (uncheckedShiftRL# w 24#) 0x000000ff##
in or# a (or# b (or# c d))
byteswap32Prim w = byteSwap32# w
#endif
-- | Combine 4 word8 [a,b,c,d] to a word32 representing [a,b,c,d]