1 /*
2 +----------------------------------------------------------------------+
3 | PHP Version 7 |
4 +----------------------------------------------------------------------+
5 | Copyright (c) 1997-2018 The PHP Group |
6 +----------------------------------------------------------------------+
7 | This source file is subject to version 3.01 of the PHP license, |
8 | that is bundled with this package in the file LICENSE, and is |
9 | available through the world-wide-web at the following url: |
10 | http://www.php.net/license/3_01.txt |
11 | If you did not receive a copy of the PHP license and are unable to |
12 | obtain it through the world-wide-web, please send a note to |
13 | license@php.net so we can mail you a copy immediately. |
14 +----------------------------------------------------------------------+
15 | Author: Rasmus Lerdorf <rasmus@php.net> |
16 +----------------------------------------------------------------------+
17 */
18
19 /* $Id$ */
20
21 #include "php.h"
22 #include "basic_functions.h"
23 #include "crc32.h"
24
25 /* {{{ proto string crc32(string str)
26 Calculate the crc32 polynomial of a string */
PHP_NAMED_FUNCTION(php_if_crc32)27 PHP_NAMED_FUNCTION(php_if_crc32)
28 {
29 char *p;
30 size_t nr;
31 uint32_t crcinit = 0;
32 register uint32_t crc;
33
34 if (zend_parse_parameters(ZEND_NUM_ARGS(), "s", &p, &nr) == FAILURE) {
35 return;
36 }
37 crc = crcinit^0xFFFFFFFF;
38
39 for (; nr--; ++p) {
40 crc = ((crc >> 8) & 0x00FFFFFF) ^ crc32tab[(crc ^ (*p)) & 0xFF ];
41 }
42 RETVAL_LONG(crc^0xFFFFFFFF);
43 }
44 /* }}} */
45
46 /*
47 * Local variables:
48 * tab-width: 4
49 * c-basic-offset: 4
50 * End:
51 * vim600: sw=4 ts=4 fdm=marker
52 * vim<600: sw=4 ts=4
53 */
54
