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Annotation of embedaddon/php/ext/standard/crc32.c, revision 1.1.1.4

1.1       misho       1: /*
                      2:    +----------------------------------------------------------------------+
                      3:    | PHP Version 5                                                        |
                      4:    +----------------------------------------------------------------------+
1.1.1.4 ! misho       5:    | Copyright (c) 1997-2014 The PHP Group                                |
1.1       misho       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: 
1.1.1.2   misho      19: /* $Id$ */
1.1       misho      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:  */