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55 lines
1.8 KiB
C
55 lines
1.8 KiB
C
/*
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+----------------------------------------------------------------------+
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| PHP Version 7 |
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+----------------------------------------------------------------------+
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| Copyright (c) 1997-2018 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: Rasmus Lerdorf <rasmus@php.net> |
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+----------------------------------------------------------------------+
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*/
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/* $Id$ */
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#include "php.h"
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#include "basic_functions.h"
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#include "crc32.h"
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/* {{{ proto string crc32(string str)
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Calculate the crc32 polynomial of a string */
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PHP_NAMED_FUNCTION(php_if_crc32)
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{
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char *p;
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size_t nr;
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uint32_t crcinit = 0;
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register uint32_t crc;
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ZEND_PARSE_PARAMETERS_START(1, 1)
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Z_PARAM_STRING(p, nr)
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ZEND_PARSE_PARAMETERS_END();
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crc = crcinit^0xFFFFFFFF;
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for (; nr--; ++p) {
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crc = ((crc >> 8) & 0x00FFFFFF) ^ crc32tab[(crc ^ (*p)) & 0xFF ];
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}
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RETVAL_LONG(crc^0xFFFFFFFF);
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}
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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: sw=4 ts=4 fdm=marker
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* vim<600: sw=4 ts=4
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*/
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