Mercurial > hg > nginx-quic
annotate src/core/ngx_crc32.h @ 6826:d0404c9a7675
Slab: simplified allocation from slots.
Removed code that would cause an endless loop, and removed condition
check that is always false. The first page in the slot list is
guaranteed to satisfy an allocation.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Wed, 07 Dec 2016 22:25:37 +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_ */ |