Annotation of embedaddon/php/ext/hash/hash_adler32.c, revision 1.1.1.4
1.1 misho 1: /*
2: +----------------------------------------------------------------------+
3: | PHP Version 5 |
4: +----------------------------------------------------------------------+
1.1.1.4 ! misho 5: | Copyright (c) 1997-2014 The PHP Group |
1.1 misho 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:
1.1.1.2 misho 20: /* $Id$ */
1.1 misho 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) {
1.1.1.2 misho 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: }
1.1 misho 44: }
1.1.1.2 misho 45: s[0] = s[0] % 65521;
46: s[1] = s[1] % 65521;
1.1 misho 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: */
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