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8215
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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 3;
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38 }
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39
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40 *p++ = 0x80 | (value >> 16);
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41 *p++ = (value >> 8);
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42 *p++ = value;
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43 return (uintptr_t) p;
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44
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45 }
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46
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47 if (p == NULL) {
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48 return 4;
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49 }
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50
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51 *p++ = 0xc0 | (value >> 24);
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52 *p++ = (value >> 16);
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53 *p++ = (value >> 8);
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54 *p++ = value;
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55 return (uintptr_t) p;
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56 }
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57
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58
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59 uintptr_t
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60 ngx_http_v3_encode_prefix_int(u_char *p, uint64_t value, ngx_uint_t prefix)
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61 {
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62 ngx_uint_t thresh, n;
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63
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64 thresh = (1 << prefix) - 1;
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65
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66 if (value < thresh) {
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67 if (p == NULL) {
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68 return 1;
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69 }
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70
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71 *p++ |= value;
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72 return (uintptr_t) p;
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73 }
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74
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75 value -= thresh;
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76
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77 for (n = 10; n > 1; n--) {
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78 if (value >> (7 * (n - 1))) {
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79 break;
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80 }
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81 }
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82
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83 if (p == NULL) {
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84 return n + 1;
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85 }
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86
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87 *p++ |= thresh;
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88
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89 for ( /* void */ ; n > 1; n--) {
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90 *p++ = 0x80 | (value >> 7 * (n - 1));
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91 }
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92
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93 *p++ = value & 0x7f;
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94
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95 return (uintptr_t) p;
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96 }
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97
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98
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99 uint64_t
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100 ngx_http_v3_decode_varlen_int(u_char *p)
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101 {
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102 uint64_t value;
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103 ngx_uint_t len;
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104
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105 len = *p >> 6;
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106 value = *p & 0x3f;
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107
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108 while (len--) {
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109 value = (value << 8) + *p++;
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110 }
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111
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112 return value;
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113 }
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114
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115
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116 int64_t
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117 ngx_http_v3_decode_prefix_int(u_char **src, size_t len, ngx_uint_t prefix)
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118 {
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119 u_char *p;
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120 int64_t value, thresh;
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121
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122 if (len == 0) {
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123 return NGX_ERROR;
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124 }
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125
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126 p = *src;
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127
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128 thresh = (1 << prefix) - 1;
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129 value = *p++ & thresh;
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130
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131 if (value != thresh) {
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132 *src = p;
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133 return value;
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134 }
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135
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136 value = 0;
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137
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138 /* XXX handle overflows */
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139
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140 while (--len) {
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141 value = (value << 7) + (*p & 0x7f);
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142 if ((*p++ & 0x80) == 0) {
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143 *src = p;
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144 return value + thresh;
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145 }
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146 }
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147
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148 return NGX_ERROR;
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149 }
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150
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151
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152 ngx_int_t
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153 ngx_http_v3_decode_huffman(ngx_connection_t *c, ngx_str_t *s)
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154 {
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155 u_char state, *p, *data;
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156
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157 state = 0;
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158
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159 p = ngx_pnalloc(c->pool, s->len * 8 / 5);
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160 if (p == NULL) {
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161 return NGX_ERROR;
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162 }
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163
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164 data = p;
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165
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166 if (ngx_http_v2_huff_decode(&state, s->data, s->len, &p, 1, c->log)
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167 != NGX_OK)
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168 {
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169 return NGX_ERROR;
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170 }
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171
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172 s->len = p - data;
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173 s->data = data;
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174
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175 return NGX_OK;
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176 }
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