Tim Starling
70 linhas
2.6 KiB
C++
70 linhas
2.6 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_adler32.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_ADLER32_CTX;
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hash_adler32::hash_adler32() : HashEngine(4, 4, sizeof(PHP_ADLER32_CTX)) {
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}
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void hash_adler32::hash_init(void *context) {
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unsigned int &state = ((PHP_ADLER32_CTX *)context)->state;
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state = 1;
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}
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void hash_adler32::hash_update(void *context, const unsigned char *buf,
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unsigned int count) {
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unsigned int &state = ((PHP_ADLER32_CTX *)context)->state;
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unsigned int s[2];
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s[0] = state & 0xffff;
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s[1] = (state >> 16) & 0xffff;
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for (unsigned int i = 0; i < count; ++i) {
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s[0] = (s[0] + buf[i]) % 65521;
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s[1] = (s[1] + s[0]) % 65521;
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}
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state = s[0] + (s[1] << 16);
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}
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void hash_adler32::hash_final(unsigned char *digest, void *context) {
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unsigned int &state = ((PHP_ADLER32_CTX *)context)->state;
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// This was a bug in PHP, see PHP bug #48284
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// We currently rely on the old behaviour
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#if defined(HPHP_OSS)
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digest[0] = (unsigned char)((state >> 24) & 0xff);
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digest[1] = (unsigned char)((state >> 16) & 0xff);
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digest[2] = (unsigned char)((state >> 8) & 0xff);
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digest[3] = (unsigned char)(state & 0xff);
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#else
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digest[3] = (unsigned char)((state >> 24) & 0xff);
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digest[2] = (unsigned char)((state >> 16) & 0xff);
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digest[1] = (unsigned char)((state >> 8) & 0xff);
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digest[0] = (unsigned char)(state & 0xff);
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#endif
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state = 0;
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}
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///////////////////////////////////////////////////////////////////////////////
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}
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