Tim Starling
81 linhas
2.9 KiB
C++
81 linhas
2.9 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_crc32.h"
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#include "hphp/runtime/ext/hash/php_hash_crc32_tables.h"
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namespace HPHP {
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///////////////////////////////////////////////////////////////////////////////
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typedef struct {
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unsigned int state;
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} PHP_CRC32_CTX;
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hash_crc32::hash_crc32(bool b)
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: HashEngine(4, 4, sizeof(PHP_CRC32_CTX)), m_b(b) {
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}
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void hash_crc32::hash_init(void *context_) {
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PHP_CRC32_CTX *context = (PHP_CRC32_CTX*)context_;
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context->state = ~0;
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}
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void hash_crc32::hash_update(void *context_, const unsigned char *input,
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unsigned int len) {
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PHP_CRC32_CTX *context = (PHP_CRC32_CTX*)context_;
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size_t i;
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if (m_b) {
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for (i = 0; i < len; ++i) {
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context->state = (context->state >> 8) ^
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crc32b_table[(context->state ^ input[i]) & 0xff];
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}
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} else {
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for (i = 0; i < len; ++i) {
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context->state = (context->state << 8) ^
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crc32_table[(context->state >> 24) ^ (input[i] & 0xff)];
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}
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}
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}
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void hash_crc32::hash_final(unsigned char *digest, void *context_) {
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PHP_CRC32_CTX *context = (PHP_CRC32_CTX*)context_;
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context->state=~context->state;
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// This was a bug in PHP, see PHP bug #45028
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// We currently rely on the old behaviour
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#if defined(HPHP_OSS)
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if (m_b) {
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digest[0] = (unsigned char) ((context->state >> 24) & 0xff);
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digest[1] = (unsigned char) ((context->state >> 16) & 0xff);
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digest[2] = (unsigned char) ((context->state >> 8) & 0xff);
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digest[3] = (unsigned char) (context->state & 0xff);
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}
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else
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#endif
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{
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digest[3] = (unsigned char) ((context->state >> 24) & 0xff);
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digest[2] = (unsigned char) ((context->state >> 16) & 0xff);
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digest[1] = (unsigned char) ((context->state >> 8) & 0xff);
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digest[0] = (unsigned char) (context->state & 0xff);
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}
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context->state = 0;
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}
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///////////////////////////////////////////////////////////////////////////////
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}
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