diff options
Diffstat (limited to 'ext/hash/hash_adler32.c')
| -rw-r--r-- | ext/hash/hash_adler32.c | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/ext/hash/hash_adler32.c b/ext/hash/hash_adler32.c new file mode 100644 index 0000000000..48b2c873d9 --- /dev/null +++ b/ext/hash/hash_adler32.c @@ -0,0 +1,66 @@ +/* + +----------------------------------------------------------------------+ + | PHP Version 5 | + +----------------------------------------------------------------------+ + | Copyright (c) 1997-2005 The PHP Group | + +----------------------------------------------------------------------+ + | This source file is subject to version 3.0 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_0.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. | + +----------------------------------------------------------------------+ + | Authors: Michael Wallner <mike@php.net> | + | Sara Golemon <pollita@php.net> | + +----------------------------------------------------------------------+ +*/ + +/* $Id$ */ + +#include "php_hash.h" +#include "php_hash_adler32.h" + +PHP_HASH_API void PHP_ADLER32Init(PHP_ADLER32_CTX *context) +{ + context->state = 1; +} + +PHP_HASH_API void PHP_ADLER32Update(PHP_ADLER32_CTX *context, const unsigned char *input, size_t len) +{ + php_hash_uint32 i, s[2] = { context->state & 0xffff, (context->state >> 16) & 0xffff }; + + for (i = 0; i < len; ++i) { + s[0] = (s[0] + input[i]) % 65521; + s[1] = (s[1] + s[0]) % 65521; + } + context->state = s[0] + (s[1] << 16); +} + +PHP_HASH_API void PHP_ADLER32Final(unsigned char digest[4], PHP_ADLER32_CTX *context) +{ + digest[3] = (unsigned char) ((context->state >> 24) & 0xff); + digest[2] = (unsigned char) ((context->state >> 16) & 0xff); + digest[1] = (unsigned char) ((context->state >> 8) & 0xff); + digest[0] = (unsigned char) (context->state & 0xff); + context->state = 0; +} + +php_hash_ops php_hash_adler32_ops = { + (php_hash_init_func_t) PHP_ADLER32Init, + (php_hash_update_func_t) PHP_ADLER32Update, + (php_hash_final_func_t) PHP_ADLER32Final, + 4, /* what to say here? */ + 4, + sizeof(PHP_ADLER32_CTX) +}; + +/* + * Local variables: + * tab-width: 4 + * c-basic-offset: 4 + * End: + * vim600: sw=4 ts=4 fdm=marker + * vim<600: sw=4 ts=4 + */ |