1 /* 2 +----------------------------------------------------------------------+ 3 | PHP Version 7 | 4 +----------------------------------------------------------------------+ 5 | Copyright (c) 1997-2018 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 */ PHP_NAMED_FUNCTION(php_if_crc32)27PHP_NAMED_FUNCTION(php_if_crc32) 28 { 29 char *p; 30 size_t nr; 31 uint32_t crcinit = 0; 32 register uint32_t crc; 33 34 ZEND_PARSE_PARAMETERS_START(1, 1) 35 Z_PARAM_STRING(p, nr) 36 ZEND_PARSE_PARAMETERS_END(); 37 38 crc = crcinit^0xFFFFFFFF; 39 40 for (; nr--; ++p) { 41 crc = ((crc >> 8) & 0x00FFFFFF) ^ crc32tab[(crc ^ (*p)) & 0xFF ]; 42 } 43 RETVAL_LONG(crc^0xFFFFFFFF); 44 } 45 /* }}} */ 46 47 /* 48 * Local variables: 49 * tab-width: 4 50 * c-basic-offset: 4 51 * End: 52 * vim600: sw=4 ts=4 fdm=marker 53 * vim<600: sw=4 ts=4 54 */ 55
