X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fcore%2Fhash.h;h=d696cae5b63542e65d6718f1012d0606b9f55833;hb=20c897ece781e18ba54c41fd68e232ce566a938d;hp=bb3de0514859922447af63c00a431ec2b7f95d6b;hpb=651cfe05e867ffdef9028a831add3eca54d19d0d;p=libs%2Fcore.git

diff --git a/source/core/hash.h b/source/core/hash.h
index bb3de05..d696cae 100644
--- a/source/core/hash.h
+++ b/source/core/hash.h
@@ -2,21 +2,16 @@
 #define MSP_CORE_HASH_H_
 
 #include <string>
+#include "inttypes.h"
 
 namespace Msp {
 
-#ifdef MSVC
-typedef __uint64 HashValue64;
-#else
-typedef unsigned long long HashValue64;
-#endif
-
 /**
 Computes a 32-bit Fowler-Noll-Vo (FNV-1a) hash.  The number of bits can be
 limited to less than 32, in which case XOR-folding is used to reduce the hash
 size.
 */
-unsigned hash32(const void *, unsigned, unsigned = 32);
+UInt32 hash32(const void *, unsigned, unsigned = 32);
 
 /**
 Convenience function to compute a 32-bit hash of a string.
@@ -28,14 +23,20 @@ inline unsigned hash32(const std::string &s, unsigned b = 32)
 Computes a 64-bit Fowler-Noll-Vo (FNV-1a) hash.  Note that even if bits is
 limited to 32 or less, this does not produce the same result as hash32.
 */
-HashValue64 hash64(const void *, unsigned, unsigned = 64);
+UInt64 hash64(const void *, unsigned, unsigned = 64);
 
 /**
 Convenience function to compute a 64-bit hash of a string.
 */
-inline HashValue64 hash64(const std::string &s, unsigned b = 64)
+inline UInt64 hash64(const std::string &s, unsigned b = 64)
 { return hash64(s.data(), s.size(), b); }
 
+inline UInt32 fold32(UInt64 hash)
+{ return hash^(hash>>32); }
+
+inline UInt16 fold16(UInt64 hash)
+{ return hash^(hash>>16)^(hash>>32)^(hash>>48); }
+
 } // namespace Msp
 
 #endif