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