Return to crc32.c CVS log

Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / php / ext / standard

php 5.4.29

    1: /*
    2:    +----------------------------------------------------------------------+
    3:    | PHP Version 5                                                        |
    4:    +----------------------------------------------------------------------+
    5:    | Copyright (c) 1997-2014 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,v 1.1.1.4 2014/06/15 20:03:57 misho Exp $ */
   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:  */