Mercurial > hg > nginx
annotate src/core/ngx_crc32.c @ 8794:ba5977b38b2e quic
HTTP/3: reordered H3_MISSING_SETTINGS and H3_FRAME_UNEXPECTED.
The quic-http-34 is ambiguous as to what error should be generated for the
first frame in control stream:
Each side MUST initiate a single control stream at the beginning of
the connection and send its SETTINGS frame as the first frame on this
stream. If the first frame of the control stream is any other frame
type, this MUST be treated as a connection error of type
H3_MISSING_SETTINGS.
If a DATA frame is received on a control stream, the recipient MUST
respond with a connection error of type H3_FRAME_UNEXPECTED.
If a HEADERS frame is received on a control stream, the recipient MUST
respond with a connection error of type H3_FRAME_UNEXPECTED.
Previously, H3_FRAME_UNEXPECTED had priority, but now H3_MISSING_SETTINGS has.
The arguments in the spec sound more compelling for H3_MISSING_SETTINGS.
author | Roman Arutyunyan <arut@nginx.com> |
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date | Fri, 11 Jun 2021 10:56:51 +0300 |
parents | d620f497c50f |
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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 #include <ngx_config.h> | |
9 #include <ngx_core.h> | |
10 | |
11 | |
12 /* | |
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13 * The code and lookup tables are based on the algorithm |
790 | 14 * described at http://www.w3.org/TR/PNG/ |
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15 * |
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16 * The 256 element lookup table takes 1024 bytes, and it may be completely |
1021 | 17 * cached after processing about 30-60 bytes of data. So for short data |
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18 * we use the 16 element lookup table that takes only 64 bytes and align it |
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19 * to CPU cache line size. Of course, the small table adds code inside |
1021 | 20 * CRC32 loop, but the cache misses overhead is bigger than overhead of |
21 * the additional code. For example, ngx_crc32_short() of 16 bytes of data | |
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22 * takes half as much CPU clocks than ngx_crc32_long(). |
790 | 23 */ |
24 | |
25 | |
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26 static uint32_t ngx_crc32_table16[] = { |
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27 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, |
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28 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, |
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29 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, |
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30 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c |
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31 }; |
790 | 32 |
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33 |
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34 uint32_t ngx_crc32_table256[] = { |
790 | 35 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, |
36 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3, | |
37 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, | |
38 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, | |
39 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, | |
40 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, | |
41 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, | |
42 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5, | |
43 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, | |
44 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, | |
45 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, | |
46 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, | |
47 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, | |
48 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f, | |
49 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, | |
50 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, | |
51 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, | |
52 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, | |
53 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, | |
54 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, | |
55 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, | |
56 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, | |
57 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, | |
58 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, | |
59 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, | |
60 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, | |
61 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, | |
62 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, | |
63 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, | |
64 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, | |
65 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, | |
66 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, | |
67 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, | |
68 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, | |
69 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, | |
70 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, | |
71 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, | |
72 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7, | |
73 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, | |
74 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, | |
75 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, | |
76 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, | |
77 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, | |
78 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79, | |
79 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, | |
80 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, | |
81 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, | |
82 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, | |
83 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, | |
84 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, | |
85 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, | |
86 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, | |
87 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, | |
88 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, | |
89 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, | |
90 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, | |
91 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, | |
92 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, | |
93 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, | |
94 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, | |
95 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, | |
96 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, | |
97 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, | |
98 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d | |
99 }; | |
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100 |
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101 |
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102 uint32_t *ngx_crc32_table_short = ngx_crc32_table16; |
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103 |
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104 |
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105 ngx_int_t |
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106 ngx_crc32_table_init(void) |
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107 { |
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108 void *p; |
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109 |
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110 if (((uintptr_t) ngx_crc32_table_short |
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111 & ~((uintptr_t) ngx_cacheline_size - 1)) |
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112 == (uintptr_t) ngx_crc32_table_short) |
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113 { |
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114 return NGX_OK; |
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115 } |
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116 |
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117 p = ngx_alloc(16 * sizeof(uint32_t) + ngx_cacheline_size, ngx_cycle->log); |
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118 if (p == NULL) { |
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119 return NGX_ERROR; |
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120 } |
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121 |
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122 p = ngx_align_ptr(p, ngx_cacheline_size); |
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123 |
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124 ngx_memcpy(p, ngx_crc32_table16, 16 * sizeof(uint32_t)); |
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125 |
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126 ngx_crc32_table_short = p; |
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127 |
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128 return NGX_OK; |
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129 } |