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/*
* mhash.h
*
* $Id$
*
* This file is part of the OpenLink Software Virtuoso Open-Source (VOS)
* project.
*
* Copyright (C) 1998-2018 OpenLink Software
*
* This project is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; only version 2 of the License, dated June 1991.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#ifndef MHASH_M
#define MHASH_M ((uint64) 0xc6a4a7935bd1e995)
#define MHASH_R 47
#endif
#ifndef MHASH_STEP
#define MHASH_STEP(h, data) \
{ \
uint64 __k = data; \
__k *= MHASH_M; \
__k ^= __k >> MHASH_R; \
__k *= MHASH_M; \
h ^= __k; \
h *= MHASH_M; \
}
#define MHASH_ID_STEP(h, data) \
{ \
uint64 __k = data; \
uint32 __k1 = __k; \
__k *= MHASH_M; \
__k ^= __k >> MHASH_R; \
__k *= MHASH_M; \
h ^= __k; \
h *= MHASH_M; \
h = (h & 0xffffffff00000000) | __k1; \
}
#ifdef VALGRIND
#define MHASH_VAR(init, ptr, len) BYTE_BUFFER_HASH (init, ptr, len)
#else
#define MHASH_VAR(init, ptr, len) \
{ \
uint64 __h = init; \
uint64 * data = (uint64*)ptr; \
uint64 * end = (uint64*)(((ptrlong)data) + (len & ~7)); \
while (data < end) \
{ \
uint64 k = *(data++); \
k *= MHASH_M; \
k ^= k >> MHASH_R; \
k *= MHASH_M; \
__h ^= k; \
__h *= MHASH_M; \
} \
if (len & 7) \
{ \
uint64 k = *data; \
k &= ((int64)1 << ((len & 7) << 3)) - 1; \
k *= MHASH_M; \
k ^= k >> MHASH_R; \
k *= MHASH_M; \
__h ^= k; \
__h *= MHASH_M; \
}\
init = __h; \
}
#endif
#endif
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