/***********************************************************************

*                                                                      *

*               This software is part of the ast package               *

*          Copyright (c) 1985-2011 AT&T Intellectual Property          *

*                      and is licensed under the                       *

*                 Eclipse Public License, Version 1.0                  *

*                    by AT&T Intellectual Property                     *

*                                                                      *

*                A copy of the License is available at                 *

*          http://www.eclipse.org/org/documents/epl-v10.html           *

*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *

*                                                                      *

*              Information and Software Systems Research               *

*                            AT&T Research                             *

*                           Florham Park NJ                            *

*                                                                      *

*                 Glenn Fowler <gsf@research.att.com>                  *

*                  David Korn <dgk@research.att.com>                   *

*                   Phong Vo <kpv@research.att.com>                    *

*                                                                      *

***********************************************************************/

#pragma prototyped

/*

 * Glenn Fowler

 * Landon Kurt Knoll

 * Phong Vo

 *

 * FNV-1 linear congruent checksum/hash/PRNG

 * see http://www.isthe.com/chongo/tech/comp/fnv/

 */

#ifndef _FNV_H

#define _FNV_H

#include <ast_common.h>

#define FNV_INIT	0x811c9dc5L

#define FNV_MULT	0x01000193L

#define FNVINIT(h)	(h = FNV_INIT)

#define FNVPART(h,c)	(h = (h) * FNV_MULT ^ (c))

#define FNVSUM(h,s,n)	do { \

			register size_t _i_ = 0; \

			while (_i_ < n) \

				FNVPART(h, ((unsigned char*)s)[_i_++]); \

			} while (0)

#if _typ_int64_t

#ifdef _ast_LL

#define FNV_INIT64	0xcbf29ce484222325LL

#define FNV_MULT64	0x00000100000001b3LL

#else

#define FNV_INIT64	((int64_t)0xcbf29ce484222325)

#define FNV_MULT64	((int64_t)0x00000100000001b3)

#endif

#define FNVINIT64(h)	(h = FNV_INIT64)

#define FNVPART64(h,c)	(h = (h) * FNV_MULT64 ^ (c))

#define FNVSUM64(h,s,n)	do { \

			register int _i_ = 0; \

			while (_i_ < n) \

				FNVPART64(h, ((unsigned char*)s)[_i_++]); \

			} while (0)

#endif

#endif