Annotation of embedaddon/nginx/src/core/ngx_crc32.h, revision 1.1.1.1
1.1 misho 1:
2: /*
3: * Copyright (C) Igor Sysoev
4: * Copyright (C) Nginx, Inc.
5: */
6:
7:
8: #ifndef _NGX_CRC32_H_INCLUDED_
9: #define _NGX_CRC32_H_INCLUDED_
10:
11:
12: #include <ngx_config.h>
13: #include <ngx_core.h>
14:
15:
16: extern uint32_t *ngx_crc32_table_short;
17: extern uint32_t ngx_crc32_table256[];
18:
19:
20: static ngx_inline uint32_t
21: ngx_crc32_short(u_char *p, size_t len)
22: {
23: u_char c;
24: uint32_t crc;
25:
26: crc = 0xffffffff;
27:
28: while (len--) {
29: c = *p++;
30: crc = ngx_crc32_table_short[(crc ^ (c & 0xf)) & 0xf] ^ (crc >> 4);
31: crc = ngx_crc32_table_short[(crc ^ (c >> 4)) & 0xf] ^ (crc >> 4);
32: }
33:
34: return crc ^ 0xffffffff;
35: }
36:
37:
38: static ngx_inline uint32_t
39: ngx_crc32_long(u_char *p, size_t len)
40: {
41: uint32_t crc;
42:
43: crc = 0xffffffff;
44:
45: while (len--) {
46: crc = ngx_crc32_table256[(crc ^ *p++) & 0xff] ^ (crc >> 8);
47: }
48:
49: return crc ^ 0xffffffff;
50: }
51:
52:
53: #define ngx_crc32_init(crc) \
54: crc = 0xffffffff
55:
56:
57: static ngx_inline void
58: ngx_crc32_update(uint32_t *crc, u_char *p, size_t len)
59: {
60: uint32_t c;
61:
62: c = *crc;
63:
64: while (len--) {
65: c = ngx_crc32_table256[(c ^ *p++) & 0xff] ^ (c >> 8);
66: }
67:
68: *crc = c;
69: }
70:
71:
72: #define ngx_crc32_final(crc) \
73: crc ^= 0xffffffff
74:
75:
76: ngx_int_t ngx_crc32_table_init(void);
77:
78:
79: #endif /* _NGX_CRC32_H_INCLUDED_ */
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