Created
June 6, 2014 22:09
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#ifdef ___cplusplus__ | |
extern "C" { | |
#endif | |
/* Description of GNU message catalog format: string hashing function. | |
Copyright (C) 1995, 1997, 1998, 2000, 2001 Free Software Foundation, Inc. | |
This program is free software; you can redistribute it and/or modify it | |
under the terms of the GNU Library General Public License as published | |
by the Free Software Foundation; either version 2, or (at your option) | |
any later version. | |
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 | |
Library General Public License for more details. | |
You should have received a copy of the GNU Library General Public | |
License along with this program; if not, write to the Free Software | |
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, | |
USA. */ | |
/* @@ end of prolog @@ */ | |
#ifndef PARAMS | |
# if __STDC__ || defined __GNUC__ || defined __SUNPRO_C || defined __cplusplus || __PROTOTYPES | |
# define PARAMS(Args) Args | |
# else | |
# define PARAMS(Args) () | |
# endif | |
#endif | |
/* We assume to have `unsigned long int' value with at least 32 bits. */ | |
#define HASHWORDBITS 32 | |
/* Defines the so called `hashpjw' function by P.J. Weinberger | |
[see Aho/Sethi/Ullman, COMPILERS: Principles, Techniques and Tools, | |
1986, 1987 Bell Telephone Laboratories, Inc.] */ | |
static uint64_t hash_string PARAMS ((const char *__str_param)); | |
#ifndef LM_HASH_H | |
#define LM_HASH_H | |
static inline uint64_t hash_string (const char *str_param){ | |
uint64_t hval, g; | |
const char *str = str_param; | |
/* Compute the hash value for the given string. */ | |
hval = 0; | |
while (*str != '\0') | |
{ | |
hval <<= 4; | |
hval += (unsigned long int) *str++; | |
g = hval & ((unsigned long int) 0xf << (HASHWORDBITS - 4)); | |
if (g != 0) | |
{ | |
hval ^= g >> (HASHWORDBITS - 8); | |
hval ^= g; | |
} | |
} | |
return hval; | |
} | |
#endif | |
#ifdef ___cplusplus__ | |
} | |
#endif |
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