1 | /* |
2 | +----------------------------------------------------------------------+ |
3 | | PHP Version 5 | |
4 | +----------------------------------------------------------------------+ |
5 | | Copyright (c) 1997-2015 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 | */ |
83 | |