mirror of
https://github.com/php/php-src.git
synced 2024-09-22 18:37:25 +00:00
230 lines
6.0 KiB
C
230 lines
6.0 KiB
C
/*
|
|
+----------------------------------------------------------------------+
|
|
| PHP Version 5 |
|
|
+----------------------------------------------------------------------+
|
|
| Copyright (c) 1997-2010 The PHP Group |
|
|
+----------------------------------------------------------------------+
|
|
| This source file is subject to version 3.01 of the PHP license, |
|
|
| that is bundled with this package in the file LICENSE, and is |
|
|
| available through the world-wide-web at the following url: |
|
|
| http://www.php.net/license/3_01.txt |
|
|
| If you did not receive a copy of the PHP license and are unable to |
|
|
| obtain it through the world-wide-web, please send a note to |
|
|
| license@php.net so we can mail you a copy immediately. |
|
|
+----------------------------------------------------------------------+
|
|
| Author: Michael Maclean <mgdm@php.net> |
|
|
+----------------------------------------------------------------------+
|
|
*/
|
|
|
|
/* $Id$ */
|
|
|
|
/* Based on the public domain algorithm found at
|
|
http://www.isthe.com/chongo/tech/comp/fnv/index.html */
|
|
|
|
#include "php_hash.h"
|
|
#include "php_hash_fnv.h"
|
|
|
|
const php_hash_ops php_hash_fnv132_ops = {
|
|
(php_hash_init_func_t) PHP_FNV132Init,
|
|
(php_hash_update_func_t) PHP_FNV132Update,
|
|
(php_hash_final_func_t) PHP_FNV132Final,
|
|
(php_hash_copy_func_t) php_hash_copy,
|
|
4,
|
|
4,
|
|
sizeof(PHP_FNV132_CTX)
|
|
};
|
|
|
|
const php_hash_ops php_hash_fnv1a32_ops = {
|
|
(php_hash_init_func_t) PHP_FNV132Init,
|
|
(php_hash_update_func_t) PHP_FNV1a32Update,
|
|
(php_hash_final_func_t) PHP_FNV132Final,
|
|
(php_hash_copy_func_t) php_hash_copy,
|
|
4,
|
|
4,
|
|
sizeof(PHP_FNV132_CTX)
|
|
};
|
|
|
|
const php_hash_ops php_hash_fnv164_ops = {
|
|
(php_hash_init_func_t) PHP_FNV164Init,
|
|
(php_hash_update_func_t) PHP_FNV164Update,
|
|
(php_hash_final_func_t) PHP_FNV164Final,
|
|
(php_hash_copy_func_t) php_hash_copy,
|
|
8,
|
|
4,
|
|
sizeof(PHP_FNV164_CTX)
|
|
};
|
|
|
|
const php_hash_ops php_hash_fnv1a64_ops = {
|
|
(php_hash_init_func_t) PHP_FNV164Init,
|
|
(php_hash_update_func_t) PHP_FNV1a64Update,
|
|
(php_hash_final_func_t) PHP_FNV164Final,
|
|
(php_hash_copy_func_t) php_hash_copy,
|
|
8,
|
|
4,
|
|
sizeof(PHP_FNV164_CTX)
|
|
};
|
|
|
|
/* {{{ PHP_FNV132Init
|
|
* 32-bit FNV-1 hash initialisation
|
|
*/
|
|
PHP_HASH_API void PHP_FNV132Init(PHP_FNV132_CTX *context)
|
|
{
|
|
context->state = PHP_FNV1_32_INIT;
|
|
}
|
|
/* }}} */
|
|
|
|
PHP_HASH_API void PHP_FNV132Update(PHP_FNV132_CTX *context, const unsigned char *input,
|
|
unsigned int inputLen)
|
|
{
|
|
context->state = fnv_32_buf((void *)input, inputLen, context->state, 0);
|
|
}
|
|
|
|
PHP_HASH_API void PHP_FNV1a32Update(PHP_FNV132_CTX *context, const unsigned char *input,
|
|
unsigned int inputLen)
|
|
{
|
|
context->state = fnv_32_buf((void *)input, inputLen, context->state, 1);
|
|
}
|
|
|
|
PHP_HASH_API void PHP_FNV132Final(unsigned char digest[4], PHP_FNV132_CTX * context)
|
|
{
|
|
#ifdef WORDS_BIGENDIAN
|
|
memcpy(digest, &context->state, 4);
|
|
#else
|
|
int i = 0;
|
|
unsigned char *c = (unsigned char *) &context->state;
|
|
|
|
for (i = 0; i < 4; i++) {
|
|
digest[i] = c[3 - i];
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/* {{{ PHP_FNV164Init
|
|
* 64-bit FNV-1 hash initialisation
|
|
*/
|
|
PHP_HASH_API void PHP_FNV164Init(PHP_FNV164_CTX *context)
|
|
{
|
|
context->state = PHP_FNV1_64_INIT;
|
|
}
|
|
/* }}} */
|
|
|
|
PHP_HASH_API void PHP_FNV164Update(PHP_FNV164_CTX *context, const unsigned char *input,
|
|
unsigned int inputLen)
|
|
{
|
|
context->state = fnv_64_buf((void *)input, inputLen, context->state, 0);
|
|
}
|
|
|
|
PHP_HASH_API void PHP_FNV1a64Update(PHP_FNV164_CTX *context, const unsigned char *input,
|
|
unsigned int inputLen)
|
|
{
|
|
context->state = fnv_64_buf((void *)input, inputLen, context->state, 1);
|
|
}
|
|
|
|
PHP_HASH_API void PHP_FNV164Final(unsigned char digest[8], PHP_FNV164_CTX * context)
|
|
{
|
|
#ifdef WORDS_BIGENDIAN
|
|
memcpy(digest, &context->state, 8);
|
|
#else
|
|
int i = 0;
|
|
unsigned char *c = (unsigned char *) &context->state;
|
|
|
|
for (i = 0; i < 8; i++) {
|
|
digest[i] = c[7 - i];
|
|
}
|
|
#endif
|
|
}
|
|
|
|
|
|
/*
|
|
* fnv_32_buf - perform a 32 bit Fowler/Noll/Vo hash on a buffer
|
|
*
|
|
* input:
|
|
* buf - start of buffer to hash
|
|
* len - length of buffer in octets
|
|
* hval - previous hash value or 0 if first call
|
|
* alternate - if > 0 use the alternate version
|
|
*
|
|
* returns:
|
|
* 32 bit hash as a static hash type
|
|
*/
|
|
static php_hash_uint32
|
|
fnv_32_buf(void *buf, size_t len, php_hash_uint32 hval, int alternate)
|
|
{
|
|
unsigned char *bp = (unsigned char *)buf; /* start of buffer */
|
|
unsigned char *be = bp + len; /* beyond end of buffer */
|
|
|
|
/*
|
|
* FNV-1 hash each octet in the buffer
|
|
*/
|
|
while (bp < be) {
|
|
|
|
if (alternate == 0) {
|
|
/* multiply by the 32 bit FNV magic prime mod 2^32 */
|
|
hval *= PHP_FNV_32_PRIME;
|
|
|
|
/* xor the bottom with the current octet */
|
|
hval ^= (php_hash_uint32)*bp++;
|
|
} else {
|
|
/* xor the bottom with the current octet */
|
|
hval ^= (php_hash_uint32)*bp++;
|
|
|
|
/* multiply by the 32 bit FNV magic prime mod 2^32 */
|
|
hval *= PHP_FNV_32_PRIME;
|
|
}
|
|
}
|
|
|
|
/* return our new hash value */
|
|
return hval;
|
|
}
|
|
|
|
/*
|
|
* fnv_64_buf - perform a 64 bit Fowler/Noll/Vo hash on a buffer
|
|
*
|
|
* input:
|
|
* buf - start of buffer to hash
|
|
* len - length of buffer in octets
|
|
* hval - previous hash value or 0 if first call
|
|
* alternate - if > 0 use the alternate version
|
|
*
|
|
* returns:
|
|
* 64 bit hash as a static hash type
|
|
*/
|
|
static php_hash_uint64
|
|
fnv_64_buf(void *buf, size_t len, php_hash_uint64 hval, int alternate)
|
|
{
|
|
unsigned char *bp = (unsigned char *)buf; /* start of buffer */
|
|
unsigned char *be = bp + len; /* beyond end of buffer */
|
|
|
|
/*
|
|
* FNV-1 hash each octet of the buffer
|
|
*/
|
|
while (bp < be) {
|
|
|
|
if (alternate == 0) {
|
|
/* multiply by the 64 bit FNV magic prime mod 2^64 */
|
|
hval *= PHP_FNV_64_PRIME;
|
|
|
|
/* xor the bottom with the current octet */
|
|
hval ^= (php_hash_uint64)*bp++;
|
|
} else {
|
|
/* xor the bottom with the current octet */
|
|
hval ^= (php_hash_uint64)*bp++;
|
|
|
|
/* multiply by the 64 bit FNV magic prime mod 2^64 */
|
|
hval *= PHP_FNV_64_PRIME;
|
|
}
|
|
}
|
|
|
|
/* return our new hash value */
|
|
return hval;
|
|
}
|
|
|
|
/*
|
|
* Local variables:
|
|
* tab-width: 4
|
|
* c-basic-offset: 4
|
|
* End:
|
|
* vim600: noet sw=4 ts=4 fdm=marker
|
|
* vim<600: noet sw=4 ts=4
|
|
*/
|