1 /*
2 +----------------------------------------------------------------------+
3 | PHP Version 7 |
4 +----------------------------------------------------------------------+
5 | Copyright (c) 1997-2016 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
25 PHP_HASH_API void PHP_ADLER32Init(PHP_ADLER32_CTX *context)
26 {
27 context->state = 1;
28 }
29
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] += input[i];
38 s[1] += s[0];
39 if (s[1]>=0x7fffffff)
40 {
41 s[0] = s[0] % 65521;
42 s[1] = s[1] % 65521;
43 }
44 }
45 s[0] = s[0] % 65521;
46 s[1] = s[1] % 65521;
47 context->state = s[0] + (s[1] << 16);
48 }
49
50 PHP_HASH_API void PHP_ADLER32Final(unsigned char digest[4], PHP_ADLER32_CTX *context)
51 {
52 digest[0] = (unsigned char) ((context->state >> 24) & 0xff);
53 digest[1] = (unsigned char) ((context->state >> 16) & 0xff);
54 digest[2] = (unsigned char) ((context->state >> 8) & 0xff);
55 digest[3] = (unsigned char) (context->state & 0xff);
56 context->state = 0;
57 }
58
59 PHP_HASH_API int PHP_ADLER32Copy(const php_hash_ops *ops, PHP_ADLER32_CTX *orig_context, PHP_ADLER32_CTX *copy_context)
60 {
61 copy_context->state = orig_context->state;
62 return SUCCESS;
63 }
64
65 const php_hash_ops php_hash_adler32_ops = {
66 (php_hash_init_func_t) PHP_ADLER32Init,
67 (php_hash_update_func_t) PHP_ADLER32Update,
68 (php_hash_final_func_t) PHP_ADLER32Final,
69 (php_hash_copy_func_t) PHP_ADLER32Copy,
70 4, /* what to say here? */
71 4,
72 sizeof(PHP_ADLER32_CTX)
73 };
74
75 /*
76 * Local variables:
77 * tab-width: 4
78 * c-basic-offset: 4
79 * End:
80 * vim600: sw=4 ts=4 fdm=marker
81 * vim<600: sw=4 ts=4
82 */