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{-# LANGUAGE CPP #-}
-- ----------------------------------------------------------------------------
--
-- (c) The University of Glasgow 2006
--
-- Fingerprints for recompilation checking and ABI versioning.
--
-- http://ghc.haskell.org/trac/ghc/wiki/Commentary/Compiler/RecompilationAvoidance
--
-- ----------------------------------------------------------------------------
module Fingerprint (
readHexFingerprint,
fingerprintByteString,
-- * Re-exported from GHC.Fingerprint
Fingerprint(..), fingerprint0,
fingerprintData,
fingerprintString,
getFileHash
) where
#include "md5.h"
##include "HsVersions.h"
import Foreign
import GHC.IO
import Numeric ( readHex )
import qualified Data.ByteString as BS
import qualified Data.ByteString.Unsafe as BS
import GHC.Fingerprint
-- useful for parsing the output of 'md5sum', should we want to do that.
readHexFingerprint :: String -> Fingerprint
readHexFingerprint s = Fingerprint w1 w2
where (s1,s2) = splitAt 16 s
[(w1,"")] = readHex s1
[(w2,"")] = readHex (take 16 s2)
-- this can move to GHC.Fingerprint in GHC 8.6
fingerprintByteString :: BS.ByteString -> Fingerprint
fingerprintByteString bs = unsafeDupablePerformIO $
BS.unsafeUseAsCStringLen bs $ \(ptr, len) -> fingerprintData (castPtr ptr) len
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