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annotate src/http/v3/ngx_http_v3.c @ 8006:79125ef2e39f quic

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HTTP/3: header encoding functions.
author Roman Arutyunyan <arut@nginx.com>
date Mon, 13 Jul 2020 16:00:00 +0300
parents b0e81f49d7c0
children
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1
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2 /*
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3 * Copyright (C) Roman Arutyunyan
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4 * Copyright (C) Nginx, Inc.
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_http.h>
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11
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12
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13 uintptr_t
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14 ngx_http_v3_encode_varlen_int(u_char *p, uint64_t value)
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15 {
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16 if (value <= 63) {
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17 if (p == NULL) {
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18 return 1;
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19 }
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20
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21 *p++ = value;
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22 return (uintptr_t) p;
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23 }
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24
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25 if (value <= 16383) {
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26 if (p == NULL) {
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27 return 2;
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28 }
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29
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30 *p++ = 0x40 | (value >> 8);
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31 *p++ = value;
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32 return (uintptr_t) p;
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33 }
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34
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35 if (value <= 1073741823) {
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36 if (p == NULL) {
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37 return 4;
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38 }
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39
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40 *p++ = 0x80 | (value >> 24);
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41 *p++ = (value >> 16);
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42 *p++ = (value >> 8);
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43 *p++ = value;
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44 return (uintptr_t) p;
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45 }
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46
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47 if (p == NULL) {
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48 return 8;
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49 }
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50
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51 *p++ = 0xc0 | (value >> 56);
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52 *p++ = (value >> 48);
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53 *p++ = (value >> 40);
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54 *p++ = (value >> 32);
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55 *p++ = (value >> 24);
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56 *p++ = (value >> 16);
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57 *p++ = (value >> 8);
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58 *p++ = value;
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59 return (uintptr_t) p;
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60 }
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61
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62
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63 uintptr_t
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64 ngx_http_v3_encode_prefix_int(u_char *p, uint64_t value, ngx_uint_t prefix)
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65 {
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66 ngx_uint_t thresh, n;
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67
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68 thresh = (1 << prefix) - 1;
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69
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70 if (value < thresh) {
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71 if (p == NULL) {
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72 return 1;
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73 }
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74
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75 *p++ |= value;
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76 return (uintptr_t) p;
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77 }
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78
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79 value -= thresh;
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80
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81 if (p == NULL) {
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82 for (n = 2; value >= 128; n++) {
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83 value >>= 7;
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84 }
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85
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86 return n;
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87 }
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88
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89 *p++ |= thresh;
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90
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91 while (value >= 128) {
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92 *p++ = 0x80 | value;
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93 value >>= 7;
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94 }
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95
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96 *p++ = value;
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97
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98 return (uintptr_t) p;
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99 }
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100
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101
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102 uintptr_t
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103 ngx_http_v3_encode_header_block_prefix(u_char *p, ngx_uint_t insert_count,
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104 ngx_uint_t sign, ngx_uint_t delta_base)
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105 {
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106 if (p == NULL) {
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107 return ngx_http_v3_encode_prefix_int(NULL, insert_count, 8)
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108 + ngx_http_v3_encode_prefix_int(NULL, delta_base, 7);
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109 }
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110
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111 *p = 0;
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112 p = (u_char *) ngx_http_v3_encode_prefix_int(p, insert_count, 8);
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113
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114 *p = sign ? 0x80 : 0;
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115 p = (u_char *) ngx_http_v3_encode_prefix_int(p, delta_base, 7);
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116
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117 return (uintptr_t) p;
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118 }
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119
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120
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121 uintptr_t
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122 ngx_http_v3_encode_header_ri(u_char *p, ngx_uint_t dynamic, ngx_uint_t index)
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123 {
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124 /* Indexed Header Field */
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125
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126 if (p == NULL) {
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127 return ngx_http_v3_encode_prefix_int(NULL, index, 6);
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128 }
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129
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130 *p = dynamic ? 0x80 : 0xc0;
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131
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132 return ngx_http_v3_encode_prefix_int(p, index, 6);
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133 }
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134
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135
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136 uintptr_t
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137 ngx_http_v3_encode_header_lri(u_char *p, ngx_uint_t dynamic, ngx_uint_t index,
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138 u_char *data, size_t len)
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139 {
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140 /* Literal Header Field With Name Reference */
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141
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142 if (p == NULL) {
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143 return ngx_http_v3_encode_prefix_int(NULL, index, 4)
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144 + ngx_http_v3_encode_prefix_int(NULL, len, 7)
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145 + len;
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146 }
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147
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148 *p = dynamic ? 0x60 : 0x70;
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149 p = (u_char *) ngx_http_v3_encode_prefix_int(p, index, 4);
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150
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151 *p = 0;
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152 p = (u_char *) ngx_http_v3_encode_prefix_int(p, len, 7);
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153
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154 if (data) {
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155 p = ngx_cpymem(p, data, len);
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156 }
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157
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158 return (uintptr_t) p;
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159 }
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160
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161
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162 uintptr_t
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163 ngx_http_v3_encode_header_l(u_char *p, ngx_str_t *name, ngx_str_t *value)
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164 {
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165 /* Literal Header Field Without Name Reference */
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166
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167 if (p == NULL) {
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168 return ngx_http_v3_encode_prefix_int(NULL, name->len, 3)
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169 + name->len
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170 + ngx_http_v3_encode_prefix_int(NULL, value->len, 7)
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171 + value->len;
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172 }
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173
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174 *p = 0x30;
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175 p = (u_char *) ngx_http_v3_encode_prefix_int(p, name->len, 3);
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176
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177 ngx_strlow(p, name->data, name->len);
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178 p += name->len;
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179
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180 *p = 0;
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181 p = (u_char *) ngx_http_v3_encode_prefix_int(p, value->len, 7);
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182
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183 p = ngx_cpymem(p, value->data, value->len);
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184
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185 return (uintptr_t) p;
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186 }
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187
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188
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189 uintptr_t
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190 ngx_http_v3_encode_header_pbi(u_char *p, ngx_uint_t index)
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191 {
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192 /* Indexed Header Field With Post-Base Index */
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193
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194 if (p == NULL) {
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195 return ngx_http_v3_encode_prefix_int(NULL, index, 4);
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196 }
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197
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198 *p = 0x10;
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199
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200 return ngx_http_v3_encode_prefix_int(p, index, 4);
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201 }
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202
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203
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204 uintptr_t
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205 ngx_http_v3_encode_header_lpbi(u_char *p, ngx_uint_t index, u_char *data,
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206 size_t len)
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207 {
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208 /* Literal Header Field With Post-Base Name Reference */
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209
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210 if (p == NULL) {
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211 return ngx_http_v3_encode_prefix_int(NULL, index, 3)
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212 + ngx_http_v3_encode_prefix_int(NULL, len, 7)
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213 + len;
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214 }
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215
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216 *p = 0x08;
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217 p = (u_char *) ngx_http_v3_encode_prefix_int(p, index, 3);
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218
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219 *p = 0;
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220 p = (u_char *) ngx_http_v3_encode_prefix_int(p, len, 7);
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221
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222 if (data) {
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223 p = ngx_cpymem(p, data, len);
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224 }
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225
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226 return (uintptr_t) p;
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227 }