crc32.c

php-4.4.7学习linux时下载的源代码

/*
   +----------------------------------------------------------------------+
   | PHP Version 4                                                        |
   +----------------------------------------------------------------------+
   | Copyright (c) 1997-2007 The PHP Group                                |
   +----------------------------------------------------------------------+
   | This source file is subject to version 3.01 of the PHP license,      |
   | that is bundled with this package in the file LICENSE, and is        |
   | available through the world-wide-web at the following url:           |
   | http://www.php.net/license/3_01.txt                                  |
   | If you did not receive a copy of the PHP license and are unable to   |
   | obtain it through the world-wide-web, please send a note to          |
   | [e-mail] so we can mail you a copy immediately.               |
   +----------------------------------------------------------------------+
   | Author: Rasmus Lerdorf <[e-mail]>                              |
   +----------------------------------------------------------------------+
*/

/* $Id: crc32.c,v 1.12.8.1.8.2 2007/01/01 09:46:47 sebastian Exp $ */

#include "php.h"
#include "basic_functions.h"
#include "crc32.h"

/* {{{ proto string crc32(string str)
   Calculate the crc32 polynomial of a string */
PHP_NAMED_FUNCTION(php_if_crc32)
{
	unsigned int crc = ~0;
	char *p;
	int len, nr;
	
	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &p, &nr) == FAILURE) {
		return;
	}

	len = 0 ;
	for (len += nr; nr--; ++p) {
	    CRC32(crc, *p);
	}
	RETVAL_LONG(~crc);
}
/* }}} */

/*
 * Local variables:
 * tab-width: 4
 * c-basic-offset: 4
 * End:
 * vim600: sw=4 ts=4 fdm=marker
 * vim<600: sw=4 ts=4
 */