1                 : /*
       2                 :    +----------------------------------------------------------------------+
       3                 :    | PHP Version 5                                                        |
       4                 :    +----------------------------------------------------------------------+
       5                 :    | Copyright (c) 1997-2009 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 272374 2008-12-31 11:17:49Z sebastian $ */
      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              93 : {
      29                 :         char *p;
      30                 :         int len, nr;
      31              93 :         php_uint32 crcinit = 0;
      32                 :         register php_uint32 crc;
      33                 : 
      34              93 :         if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &p, &nr) == FAILURE) {
      35               8 :                 return;
      36                 :         }
      37              85 :         crc = crcinit^0xFFFFFFFF;
      38                 : 
      39            2996 :         for (len =+nr; nr--; ++p) {
      40            2911 :                 crc = ((crc >> 8) & 0x00FFFFFF) ^ crc32tab[(crc ^ (*p)) & 0xFF ];
      41                 :         }
      42              85 :         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                 :  */