Tim Starling
138 linhas
4.3 KiB
C++
138 linhas
4.3 KiB
C++
/*
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+----------------------------------------------------------------------+
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| HipHop for PHP |
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+----------------------------------------------------------------------+
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| Copyright (c) 2010-2013 Facebook, Inc. (http://www.facebook.com) |
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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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*/
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#include "hphp/runtime/ext/hash/hash_fnv1.h"
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#define PHP_FNV1_32_INIT ((uint32_t)0x811c9dc5)
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#define PHP_FNV_32_PRIME ((uint32_t)0x01000193)
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#define PHP_FNV1_64_INIT ((uint64_t)0xcbf29ce484222325ULL)
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#define PHP_FNV_64_PRIME ((uint64_t)0x100000001b3ULL)
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namespace HPHP {
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///////////////////////////////////////////////////////////////////////////////
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typedef struct {
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uint32_t state;
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} PHP_FNV132_CTX;
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typedef struct {
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uint64_t state;
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} PHP_FNV164_CTX;
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hash_fnv132::hash_fnv132(bool a)
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: HashEngine(4, 4, sizeof(PHP_FNV132_CTX)), m_a(a) {
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}
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hash_fnv164::hash_fnv164(bool a)
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: HashEngine(8, 4, sizeof(PHP_FNV164_CTX)), m_a(a) {
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}
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void hash_fnv132::hash_init(void *context_) {
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PHP_FNV132_CTX *context = (PHP_FNV132_CTX*)context_;
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context->state = PHP_FNV1_32_INIT;
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}
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void hash_fnv164::hash_init(void *context_) {
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PHP_FNV164_CTX *context = (PHP_FNV164_CTX*)context_;
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context->state = PHP_FNV1_64_INIT;
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}
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void hash_fnv132::hash_update(void *context_, const unsigned char *input,
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unsigned int len) {
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PHP_FNV132_CTX *context = (PHP_FNV132_CTX*)context_;
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const unsigned char *bp = (unsigned char *)input; /* start of buffer */
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const 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 (m_a == false) {
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/* multiply by the 32 bit FNV magic prime mod 2^32 */
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context->state *= PHP_FNV_32_PRIME;
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/* xor the bottom with the current octet */
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context->state ^= (uint32_t)*bp++;
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} else {
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/* xor the bottom with the current octet */
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context->state ^= (uint32_t)*bp++;
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/* multiply by the 32 bit FNV magic prime mod 2^32 */
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context->state *= PHP_FNV_32_PRIME;
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}
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}
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}
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void hash_fnv164::hash_update(void *context_, const unsigned char *input,
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unsigned int len) {
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PHP_FNV164_CTX *context = (PHP_FNV164_CTX*)context_;
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unsigned char *bp = (unsigned char *)input; /* 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 (m_a == false) {
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/* multiply by the 64 bit FNV magic prime mod 2^64 */
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context->state *= PHP_FNV_64_PRIME;
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/* xor the bottom with the current octet */
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context->state ^= (uint64_t)*bp++;
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} else {
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/* xor the bottom with the current octet */
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context->state ^= (uint64_t)*bp++;
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/* multiply by the 64 bit FNV magic prime mod 2^64 */
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context->state *= PHP_FNV_64_PRIME;
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}
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}
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}
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void hash_fnv132::hash_final(unsigned char *digest, void *context_) {
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PHP_FNV132_CTX *context = (PHP_FNV132_CTX*)context_;
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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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void hash_fnv164::hash_final(unsigned char *digest, void *context_) {
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PHP_FNV164_CTX *context = (PHP_FNV164_CTX*)context_;
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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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}
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