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comparison src/core/ngx_crc32.h @ 250:fbf2b2f66c9f NGINX_0_4_10

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nginx 0.4.10 *) Feature: the POP3 proxy supports the APOP command. *) Bugfix: if the select, poll or /dev/poll methods were used, then while waiting authentication server response the IMAP/POP3 proxy hogged CPU. *) Bugfix: a segmentation fault might occur if the $server_addr variable was used in the "map" directive. *) Bugfix: the ngx_http_flv_module did not support the byte ranges for full responses; bug appeared in 0.4.7. *) Bugfix: nginx could not be built on Debian amd64; bug appeared in 0.4.9.
author Igor Sysoev <http://sysoev.ru>
date Mon, 23 Oct 2006 00:00:00 +0400
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children 6eb1e38f0f1f
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249:7a34085272cb 250:fbf2b2f66c9f
1
2 /*
3 * Copyright (C) Igor Sysoev
4 */
5
6
7 #ifndef _NGX_CRC32_H_INCLUDED_
8 #define _NGX_CRC32_H_INCLUDED_
9
10
11 #include <ngx_config.h>
12 #include <ngx_core.h>
13
14
15 extern uint32_t *ngx_crc32_table_short;
16 extern uint32_t ngx_crc32_table256[];
17
18
19 static ngx_inline uint32_t
20 ngx_crc32_short(u_char *p, size_t len)
21 {
22 u_char c;
23 uint32_t crc;
24
25 crc = 0xffffffff;
26
27 while (len--) {
28 c = *p++;
29 crc = ngx_crc32_table_short[(crc ^ (c & 0xf)) & 0xf] ^ (crc >> 4);
30 crc = ngx_crc32_table_short[(crc ^ (c >> 4)) & 0xf] ^ (crc >> 4);
31 }
32
33 return crc ^ 0xffffffff;
34 }
35
36
37 static ngx_inline uint32_t
38 ngx_crc32_long(u_char *p, size_t len)
39 {
40 uint32_t crc;
41
42 crc = 0xffffffff;
43
44 while (len--) {
45 crc = ngx_crc32_table256[(crc ^ *p++) & 0xff] ^ (crc >> 8);
46 }
47
48 return crc ^ 0xffffffff;
49 }
50
51
52 ngx_int_t ngx_crc32_init(ngx_pool_t *pool);
53
54
55 #endif /* _NGX_CRC32_H_INCLUDED_ */