diff options
Diffstat (limited to 'ext/standard/crc32.c')
| -rw-r--r-- | ext/standard/crc32.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/ext/standard/crc32.c b/ext/standard/crc32.c new file mode 100644 index 0000000..e9c36d4 --- /dev/null +++ b/ext/standard/crc32.c @@ -0,0 +1,53 @@ +/* + +----------------------------------------------------------------------+ + | PHP Version 5 | + +----------------------------------------------------------------------+ + | Copyright (c) 1997-2013 The PHP Group | + +----------------------------------------------------------------------+ + | This source file is subject to version 3.01 of the PHP license, | + | that is bundled with this package in the file LICENSE, and is | + | available through the world-wide-web at the following url: | + | http://www.php.net/license/3_01.txt | + | If you did not receive a copy of the PHP license and are unable to | + | obtain it through the world-wide-web, please send a note to | + | license@php.net so we can mail you a copy immediately. | + +----------------------------------------------------------------------+ + | Author: Rasmus Lerdorf <rasmus@php.net> | + +----------------------------------------------------------------------+ +*/ + +/* $Id$ */ + +#include "php.h" +#include "basic_functions.h" +#include "crc32.h" + +/* {{{ proto string crc32(string str) + Calculate the crc32 polynomial of a string */ +PHP_NAMED_FUNCTION(php_if_crc32) +{ + char *p; + int len, nr; + php_uint32 crcinit = 0; + register php_uint32 crc; + + if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &p, &nr) == FAILURE) { + return; + } + crc = crcinit^0xFFFFFFFF; + + for (len =+nr; nr--; ++p) { + crc = ((crc >> 8) & 0x00FFFFFF) ^ crc32tab[(crc ^ (*p)) & 0xFF ]; + } + RETVAL_LONG(crc^0xFFFFFFFF); +} +/* }}} */ + +/* + * Local variables: + * tab-width: 4 + * c-basic-offset: 4 + * End: + * vim600: sw=4 ts=4 fdm=marker + * vim<600: sw=4 ts=4 + */ |