Mercurial > hg > nginx-quic
annotate src/core/ngx_crc32.h @ 8437:d5f93733c17d quic
QUIC: relaxed client id requirements.
Client IDs cannot be reused on different paths. This change allows to reuse
client id previosly seen on the same path (but with different dcid) in case
when no unused client IDs are available.
author | Vladimir Homutov <vl@nginx.com> |
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date | Wed, 05 May 2021 18:11:55 +0300 |
parents | d620f497c50f |
children |
rev | line source |
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790 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4412 | 4 * Copyright (C) Nginx, Inc. |
790 | 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 | |
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16 extern uint32_t *ngx_crc32_table_short; |
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17 extern uint32_t ngx_crc32_table256[]; |
790 | 18 |
19 | |
20 static ngx_inline uint32_t | |
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21 ngx_crc32_short(u_char *p, size_t len) |
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22 { |
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23 u_char c; |
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24 uint32_t crc; |
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25 |
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26 crc = 0xffffffff; |
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27 |
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28 while (len--) { |
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29 c = *p++; |
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30 crc = ngx_crc32_table_short[(crc ^ (c & 0xf)) & 0xf] ^ (crc >> 4); |
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31 crc = ngx_crc32_table_short[(crc ^ (c >> 4)) & 0xf] ^ (crc >> 4); |
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32 } |
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33 |
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34 return crc ^ 0xffffffff; |
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35 } |
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36 |
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37 |
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38 static ngx_inline uint32_t |
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39 ngx_crc32_long(u_char *p, size_t len) |
790 | 40 { |
41 uint32_t crc; | |
42 | |
43 crc = 0xffffffff; | |
44 | |
45 while (len--) { | |
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46 crc = ngx_crc32_table256[(crc ^ *p++) & 0xff] ^ (crc >> 8); |
790 | 47 } |
48 | |
49 return crc ^ 0xffffffff; | |
50 } | |
51 | |
52 | |
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53 #define ngx_crc32_init(crc) \ |
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54 crc = 0xffffffff |
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55 |
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56 |
1697 | 57 static ngx_inline void |
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58 ngx_crc32_update(uint32_t *crc, u_char *p, size_t len) |
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59 { |
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60 uint32_t c; |
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61 |
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62 c = *crc; |
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63 |
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64 while (len--) { |
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65 c = ngx_crc32_table256[(c ^ *p++) & 0xff] ^ (c >> 8); |
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66 } |
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67 |
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68 *crc = c; |
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69 } |
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70 |
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71 |
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72 #define ngx_crc32_final(crc) \ |
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73 crc ^= 0xffffffff |
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74 |
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75 |
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76 ngx_int_t ngx_crc32_table_init(void); |
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77 |
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78 |
790 | 79 #endif /* _NGX_CRC32_H_INCLUDED_ */ |