1 /*
2 +----------------------------------------------------------------------+
3 | PHP Version 5 |
4 +----------------------------------------------------------------------+
5 | Copyright (c) 1997-2013 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 | Authors: Michael Wallner <mike@php.net> |
16 | Sara Golemon <pollita@php.net> |
17 +----------------------------------------------------------------------+
18 */
19
20 /* $Id$ */
21
22 #include "php_hash.h"
23 #include "php_hash_adler32.h"
24
PHP_ADLER32Init(PHP_ADLER32_CTX * context)25 PHP_HASH_API void PHP_ADLER32Init(PHP_ADLER32_CTX *context)
26 {
27 context->state = 1;
28 }
29
PHP_ADLER32Update(PHP_ADLER32_CTX * context,const unsigned char * input,size_t len)30 PHP_HASH_API void PHP_ADLER32Update(PHP_ADLER32_CTX *context, const unsigned char *input, size_t len)
31 {
32 php_hash_uint32 i, s[2];
33
34 s[0] = context->state & 0xffff;
35 s[1] = (context->state >> 16) & 0xffff;
36 for (i = 0; i < len; ++i) {
37 s[0] = (s[0] + input[i]) % 65521;
38 s[1] = (s[1] + s[0]) % 65521;
39 }
40 context->state = s[0] + (s[1] << 16);
41 }
42
PHP_ADLER32Final(unsigned char digest[4],PHP_ADLER32_CTX * context)43 PHP_HASH_API void PHP_ADLER32Final(unsigned char digest[4], PHP_ADLER32_CTX *context)
44 {
45 digest[0] = (unsigned char) ((context->state >> 24) & 0xff);
46 digest[1] = (unsigned char) ((context->state >> 16) & 0xff);
47 digest[2] = (unsigned char) ((context->state >> 8) & 0xff);
48 digest[3] = (unsigned char) (context->state & 0xff);
49 context->state = 0;
50 }
51
PHP_ADLER32Copy(const php_hash_ops * ops,PHP_ADLER32_CTX * orig_context,PHP_ADLER32_CTX * copy_context)52 PHP_HASH_API int PHP_ADLER32Copy(const php_hash_ops *ops, PHP_ADLER32_CTX *orig_context, PHP_ADLER32_CTX *copy_context)
53 {
54 copy_context->state = orig_context->state;
55 return SUCCESS;
56 }
57
58 const php_hash_ops php_hash_adler32_ops = {
59 (php_hash_init_func_t) PHP_ADLER32Init,
60 (php_hash_update_func_t) PHP_ADLER32Update,
61 (php_hash_final_func_t) PHP_ADLER32Final,
62 (php_hash_copy_func_t) PHP_ADLER32Copy,
63 4, /* what to say here? */
64 4,
65 sizeof(PHP_ADLER32_CTX)
66 };
67
68 /*
69 * Local variables:
70 * tab-width: 4
71 * c-basic-offset: 4
72 * End:
73 * vim600: sw=4 ts=4 fdm=marker
74 * vim<600: sw=4 ts=4
75 */
76
