/* HashKit
* Copyright (C) 2009 Brian Aker
* All rights reserved.
*
* Use and distribution licensed under the BSD license. See
* the COPYING file in the parent directory for full text.
*/
#include "common.h"
/* FNV hash'es lifted from Dustin Sallings work */
static uint64_t FNV_64_INIT= UINT64_C(0xcbf29ce484222325);
static uint64_t FNV_64_PRIME= UINT64_C(0x100000001b3);
static uint32_t FNV_32_INIT= 2166136261UL;
static uint32_t FNV_32_PRIME= 16777619;
uint32_t hashkit_fnv1_64(const char *key, size_t key_length, void *context __attribute__((unused)))
{
/* Thanks to pierre@demartines.com for the pointer */
uint64_t hash= FNV_64_INIT;
for (size_t x= 0; x < key_length; x++)
{
hash *= FNV_64_PRIME;
hash ^= (uint64_t)key[x];
}
return (uint32_t)hash;
}
uint32_t hashkit_fnv1a_64(const char *key, size_t key_length, void *context __attribute__((unused)))
{
uint32_t hash= (uint32_t) FNV_64_INIT;
for (size_t x= 0; x < key_length; x++)
{
uint32_t val= (uint32_t)key[x];
hash ^= val;
hash *= (uint32_t) FNV_64_PRIME;
}
return hash;
}
uint32_t hashkit_fnv1_32(const char *key, size_t key_length, void *context __attribute__((unused)))
{
uint32_t hash= FNV_32_INIT;
for (size_t x= 0; x < key_length; x++)
{
uint32_t val= (uint32_t)key[x];
hash *= FNV_32_PRIME;
hash ^= val;
}
return hash;
}
uint32_t hashkit_fnv1a_32(const char *key, size_t key_length, void *context __attribute__((unused)))
{
uint32_t hash= FNV_32_INIT;
for (size_t x= 0; x < key_length; x++)
{
uint32_t val= (uint32_t)key[x];
hash ^= val;
hash *= FNV_32_PRIME;
}
return hash;
}