1 | /* |
2 | +----------------------------------------------------------------------+ |
3 | | PHP Version 5 | |
4 | +----------------------------------------------------------------------+ |
5 | | Copyright (c) 1997-2015 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 */ |
27 | PHP_NAMED_FUNCTION(php_if_crc32) |
28 | { |
29 | char *p; |
30 | int len, nr; |
31 | php_uint32 crcinit = 0; |
32 | register php_uint32 crc; |
33 | |
34 | if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s" , &p, &nr) == FAILURE) { |
35 | return; |
36 | } |
37 | crc = crcinit^0xFFFFFFFF; |
38 | |
39 | for (len =+nr; 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 | |