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1-- |
2-- Module : Crypto.Internal.Compat
3-- License : BSD-style
4-- Maintainer : Vincent Hanquez <vincent@snarc.org>
5-- Stability : stable
6-- Portability : Good
7--
8-- This module try to keep all the difference between versions of base
9-- or other needed packages, so that modules don't need to use CPP
10--
11{-# LANGUAGE CPP #-}
12module Crypto.Internal.Compat
13 ( unsafeDoIO
14 , popCount
15 , byteSwap64
16 ) where
17
18import System.IO.Unsafe
19import Data.Word
20import Data.Bits
21
22-- | perform io for hashes that do allocation and ffi.
23-- unsafeDupablePerformIO is used when possible as the
24-- computation is pure and the output is directly linked
25-- to the input. we also do not modify anything after it has
26-- been returned to the user.
27unsafeDoIO :: IO a -> a
28#if __GLASGOW_HASKELL__ > 704
29unsafeDoIO = unsafeDupablePerformIO
30#else
31unsafeDoIO = unsafePerformIO
32#endif
33
34#if !(MIN_VERSION_base(4,5,0))
35popCount :: Word64 -> Int
36popCount n = loop 0 n
37 where loop c 0 = c
38 loop c i = loop (c + if testBit c 0 then 1 else 0) (i `shiftR` 1)
39#endif
40
41#if !(MIN_VERSION_base(4,7,0))
42byteSwap64 :: Word64 -> Word64
43byteSwap64 w =
44 (w `shiftR` 56) .|. (w `shiftL` 56)
45 .|. ((w `shiftR` 40) .&. 0xff00) .|. ((w .&. 0xff00) `shiftL` 40)
46 .|. ((w `shiftR` 24) .&. 0xff0000) .|. ((w .&. 0xff0000) `shiftL` 24)
47 .|. ((w `shiftR` 8) .&. 0xff000000) .|. ((w .&. 0xff000000) `shiftL` 8)
48#endif