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Annotation of embedaddon/php/ext/standard/crc32.c, revision 1.1

1.1     ! misho       1: /*
        !             2:    +----------------------------------------------------------------------+
        !             3:    | PHP Version 5                                                        |
        !             4:    +----------------------------------------------------------------------+
        !             5:    | Copyright (c) 1997-2012 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: crc32.c 321634 2012-01-01 13:15:04Z felipe $ */
        !            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:  */