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56
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9
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10
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138
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11 void *
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12 ngx_hash_find(ngx_hash_t *hash, ngx_uint_t key, u_char *name, size_t len)
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13 {
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14 ngx_uint_t i;
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15 ngx_hash_elt_t *elt;
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16
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17 #if 0
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18 ngx_str_t line;
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19
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20 line.len = len;
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21 line.data = name;
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22 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0, "hf:\"%V\"", &line);
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23 #endif
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24
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25 elt = hash->buckets[key % hash->size];
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26
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27 if (elt == NULL) {
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28 return NULL;
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29 }
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30
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31 while (elt->value) {
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32 if (len != (size_t) elt->len) {
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33 goto next;
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34 }
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35
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36 for (i = 0; i < len; i++) {
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37 if (name[i] != elt->name[i]) {
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38 goto next;
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39 }
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40 }
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41
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42 return elt->value;
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43
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44 next:
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45
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46 elt = (ngx_hash_elt_t *) ngx_align_ptr(&elt->name[0] + elt->len,
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47 sizeof(void *));
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48 continue;
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49 }
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50
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51 return NULL;
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52 }
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53
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54
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55 void *
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56 ngx_hash_find_wildcard(ngx_hash_wildcard_t *hwc, u_char *name, size_t len)
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57 {
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58 void *value;
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59 ngx_uint_t i, n, key;
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60
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61 #if 0
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62 ngx_str_t line;
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63
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64 line.len = len;
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65 line.data = name;
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66 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0, "wc:\"%V\"", &line);
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67 #endif
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68
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69 n = len;
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70
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71 while (n) {
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72 if (name[n - 1] == '.') {
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73 break;
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74 }
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75
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76 n--;
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77 }
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78
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79 if (n == 0) {
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80 return NULL;
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81 }
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82
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83 key = 0;
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84
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85 for (i = n; i < len; i++) {
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86 key = ngx_hash(key, name[i]);
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87 }
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88
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89 #if 0
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90 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0, "key:\"%ui\"", key);
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91 #endif
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92
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93 value = ngx_hash_find(&hwc->hash, key, &name[n], len - n);
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94
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95 if (value) {
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96 if ((uintptr_t) value & 1) {
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97 hwc = (ngx_hash_wildcard_t *) ((uintptr_t) value & (uintptr_t) ~1);
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98
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99 value = ngx_hash_find_wildcard(hwc, name, n - 1);
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100
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101 if (value) {
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102 return value;
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103 }
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104
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105 return hwc->value;
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106 }
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107
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108 return value;
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109 }
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110
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111 return hwc->value;
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112 }
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113
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114
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115 #define NGX_HASH_ELT_SIZE(name) \
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116 sizeof(void *) + ngx_align((name)->key.len + 1, sizeof(void *))
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117
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56
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118 ngx_int_t
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138
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119 ngx_hash_init(ngx_hash_init_t *hinit, ngx_hash_key_t *names, ngx_uint_t nelts)
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120 {
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121 u_char *elts;
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122 size_t *test, len;
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123 ngx_uint_t i, n, key, size, start, bucket_size;
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124 ngx_hash_elt_t *elt, **buckets;
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125
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126 for (n = 0; n < nelts; n++) {
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127 if (names[n].key.len >= 255) {
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128 ngx_log_error(NGX_LOG_EMERG, hinit->pool->log, 0,
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129 "the \"%V\" value to hash is to long: %uz bytes, "
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130 "the maximum length can be 255 bytes only",
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131 &names[n].key, names[n].key.len);
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132 return NGX_ERROR;
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133 }
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134
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135 if (hinit->bucket_size < NGX_HASH_ELT_SIZE(&names[n]) + sizeof(void *))
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136 {
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137 ngx_log_error(NGX_LOG_EMERG, hinit->pool->log, 0,
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138 "could not build the %s hash, you should "
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139 "increase %s_bucket_size: %i",
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140 hinit->name, hinit->name, hinit->bucket_size);
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141 return NGX_ERROR;
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142 }
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143 }
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144
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145 test = ngx_alloc(hinit->max_size * sizeof(ngx_uint_t), hinit->pool->log);
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146 if (test == NULL) {
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147 return NGX_ERROR;
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148 }
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149
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150 start = nelts / (ngx_cacheline_size / (2 * sizeof(void *)) - 1);
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151 start = start ? start : 1;
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152
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153 bucket_size = hinit->bucket_size - sizeof(void *);
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154
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155 for (size = start; size < hinit->max_size; size++) {
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156
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157 ngx_memzero(test, size * sizeof(ngx_uint_t));
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158
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159 for (n = 0; n < nelts; n++) {
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160 if (names[n].key.data == NULL) {
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161 continue;
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162 }
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163
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164 key = names[n].key_hash % size;
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165 test[key] += NGX_HASH_ELT_SIZE(&names[n]);
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166
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167 #if 0
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168 ngx_log_error(NGX_LOG_ALERT, hinit->pool->log, 0,
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169 "%ui: %ui %ui \"%V\"",
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170 size, key, test[key], &names[n].key);
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171 #endif
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172
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173 if (test[key] > bucket_size) {
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174 goto next;
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175 }
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176 }
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177
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178 goto found;
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179
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180 next:
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181
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182 continue;
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183 }
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184
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185 ngx_log_error(NGX_LOG_EMERG, hinit->pool->log, 0,
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186 "could not build the %s hash, you should increase "
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187 "either %s_max_size: %i or %s_bucket_size: %i",
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188 hinit->name, hinit->name, hinit->max_size,
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189 hinit->name, hinit->bucket_size);
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190
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191 ngx_free(test);
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192
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193 return NGX_ERROR;
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194
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195 found:
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196
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197 for (i = 0; i < size; i++) {
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198 test[i] = sizeof(void *);
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199 }
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200
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201 for (n = 0; n < nelts; n++) {
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202 if (names[n].key.data == NULL) {
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203 continue;
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204 }
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205
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206 key = names[n].key_hash % size;
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207 test[key] += NGX_HASH_ELT_SIZE(&names[n]);
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208 }
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209
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210 len = 0;
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211
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212 for (i = 0; i < size; i++) {
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213 if (test[i] == sizeof(void *)) {
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214 continue;
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215 }
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216
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217 test[i] = ngx_align(test[i], ngx_cacheline_size);
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218
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219 len += test[i];
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220 }
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221
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222 if (hinit->hash == NULL) {
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223 hinit->hash = ngx_pcalloc(hinit->pool, sizeof(ngx_hash_wildcard_t)
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224 + size * sizeof(ngx_hash_elt_t *));
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225 if (hinit->hash == NULL) {
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226 ngx_free(test);
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227 return NGX_ERROR;
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228 }
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229
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230 buckets = (ngx_hash_elt_t **)
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231 ((u_char *) hinit->hash + sizeof(ngx_hash_wildcard_t));
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232
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233 } else {
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234 buckets = ngx_pcalloc(hinit->pool, size * sizeof(ngx_hash_elt_t *));
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235 if (buckets == NULL) {
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236 ngx_free(test);
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237 return NGX_ERROR;
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238 }
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239 }
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240
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241 elts = ngx_palloc(hinit->pool, len + ngx_cacheline_size);
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242 if (elts == NULL) {
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243 ngx_free(test);
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244 return NGX_ERROR;
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245 }
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246
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247 elts = ngx_align_ptr(elts, ngx_cacheline_size);
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248
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249 for (i = 0; i < size; i++) {
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250 if (test[i] == sizeof(void *)) {
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251 continue;
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252 }
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253
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254 buckets[i] = (ngx_hash_elt_t *) elts;
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255 elts += test[i];
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256
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257 }
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258
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259 for (i = 0; i < size; i++) {
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260 test[i] = 0;
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261 }
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262
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263 for (n = 0; n < nelts; n++) {
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264 if (names[n].key.data == NULL) {
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265 continue;
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266 }
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267
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268 key = names[n].key_hash % size;
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269 elt = (ngx_hash_elt_t *) ((u_char *) buckets[key] + test[key]);
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270
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271 elt->value = names[n].value;
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272 elt->len = (u_char) names[n].key.len;
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273
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274 for (i = 0; i < names[n].key.len; i++) {
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275 elt->name[i] = ngx_tolower(names[n].key.data[i]);
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276 }
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277
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278 test[key] += NGX_HASH_ELT_SIZE(&names[n]);
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279 }
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280
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281 for (i = 0; i < size; i++) {
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282 if (buckets[i] == NULL) {
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283 continue;
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284 }
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285
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286 elt = (ngx_hash_elt_t *) ((u_char *) buckets[i] + test[i]);
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287
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288 elt->value = NULL;
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289 }
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290
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291 ngx_free(test);
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292
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293 hinit->hash->buckets = buckets;
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294 hinit->hash->size = size;
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295
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296 #if 0
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297
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298 for (i = 0; i < size; i++) {
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299 ngx_str_t val;
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300 ngx_uint_t key;
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301
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302 elt = buckets[i];
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303
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304 if (elt == NULL) {
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305 ngx_log_error(NGX_LOG_ALERT, hinit->pool->log, 0,
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306 "%ui: NULL", i);
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307 continue;
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308 }
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309
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310 while (elt->value) {
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311 val.len = elt->len;
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312 val.data = &elt->name[0];
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313
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314 key = hinit->key(val.data, val.len);
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315
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316 ngx_log_error(NGX_LOG_ALERT, hinit->pool->log, 0,
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317 "%ui: %p \"%V\" %ui", i, elt, &val, key);
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318
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319 elt = (ngx_hash_elt_t *) ngx_align_ptr(&elt->name[0] + elt->len,
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320 sizeof(void *));
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321 }
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322 }
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323
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324 #endif
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325
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326 return NGX_OK;
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327 }
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328
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329
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330 ngx_int_t
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331 ngx_hash_wildcard_init(ngx_hash_init_t *hinit, ngx_hash_key_t *names,
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332 ngx_uint_t nelts)
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333 {
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334 size_t len;
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335 ngx_uint_t i, n;
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336 ngx_array_t curr_names, next_names;
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337 ngx_hash_key_t *name, *next_name;
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338 ngx_hash_init_t h;
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339 ngx_hash_wildcard_t *wdc;
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340
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341 if (ngx_array_init(&curr_names, hinit->temp_pool, nelts,
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342 sizeof(ngx_hash_key_t))
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343 != NGX_OK)
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344 {
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345 return NGX_ERROR;
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346 }
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347
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348 if (ngx_array_init(&next_names, hinit->temp_pool, nelts,
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349 sizeof(ngx_hash_key_t))
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350 != NGX_OK)
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351 {
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352 return NGX_ERROR;
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353 }
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354
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355 for (n = 0; n < nelts; n = i) {
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356
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357 #if 0
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358 ngx_log_error(NGX_LOG_ALERT, hinit->pool->log, 0,
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359 "wc0: \"%V\"", &names[n].key);
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360 #endif
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361
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362 for (len = 0; len < names[n].key.len; len++) {
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363 if (names[n].key.data[len] == '.') {
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364 len++;
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365 break;
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366 }
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367 }
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368
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369 name = ngx_array_push(&curr_names);
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370 if (name == NULL) {
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371 return NGX_ERROR;
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372 }
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373
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374 name->key.len = len - 1;
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375 name->key.data = names[n].key.data;
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376 name->key_hash = hinit->key(name->key.data, name->key.len);
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377 name->value = names[n].value;
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378
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379 #if 0
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380 ngx_log_error(NGX_LOG_ALERT, hinit->pool->log, 0,
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381 "wc1: \"%V\"", &name->key);
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382 #endif
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383
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384 next_names.nelts = 0;
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385
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386 if (names[n].key.len != len) {
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387 next_name = ngx_array_push(&next_names);
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388 if (next_name == NULL) {
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389 return NGX_ERROR;
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390 }
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391
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392 next_name->key.len = names[n].key.len - len;
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393 next_name->key.data = names[n].key.data + len;
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394 next_name->key_hash= 0;
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395 next_name->value = names[n].value;
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396
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397 #if 0
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398 ngx_log_error(NGX_LOG_ALERT, hinit->pool->log, 0,
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399 "wc2: \"%V\"", &next_name->key);
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400 #endif
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401 }
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402
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403 for (i = n + 1; i < nelts; i++) {
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404 if (ngx_strncmp(names[n].key.data, names[i].key.data, len) != 0) {
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405 break;
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406 }
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407
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408 next_name = ngx_array_push(&next_names);
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409 if (next_name == NULL) {
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410 return NGX_ERROR;
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411 }
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412
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413 next_name->key.len = names[i].key.len - len;
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414 next_name->key.data = names[i].key.data + len;
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415 next_name->key_hash= 0;
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416 next_name->value = names[i].value;
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417
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418 #if 0
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419 ngx_log_error(NGX_LOG_ALERT, hinit->pool->log, 0,
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420 "wc2: \"%V\"", &next_name->key);
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421 #endif
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422 }
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423
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424 if (next_names.nelts) {
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425 h = *hinit;
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|
426 h.hash = NULL;
|
|
|
427
|
|
|
428 if (ngx_hash_wildcard_init(&h, (ngx_hash_key_t *) next_names.elts,
|
|
|
429 next_names.nelts)
|
|
|
430 != NGX_OK)
|
|
|
431 {
|
|
|
432 return NGX_ERROR;
|
|
|
433 }
|
|
|
434
|
|
|
435 wdc = (ngx_hash_wildcard_t *) h.hash;
|
|
|
436
|
|
|
437 if (names[n].key.len == len) {
|
|
|
438 wdc->value = names[n].value;
|
|
|
439 #if 0
|
|
|
440 ngx_log_error(NGX_LOG_ALERT, hinit->pool->log, 0,
|
|
|
441 "wdc: \"%V\"", wdc->value);
|
|
|
442 #endif
|
|
|
443 }
|
|
|
444
|
|
|
445 name->value = (void *) ((uintptr_t) wdc | 1);
|
|
|
446 }
|
|
|
447 }
|
|
|
448
|
|
|
449 if (ngx_hash_init(hinit, (ngx_hash_key_t *) curr_names.elts,
|
|
|
450 curr_names.nelts)
|
|
|
451 != NGX_OK)
|
|
|
452 {
|
|
|
453 return NGX_ERROR;
|
|
|
454 }
|
|
|
455
|
|
|
456 return NGX_OK;
|
|
|
457 }
|
|
|
458
|
|
|
459
|
|
|
460 ngx_uint_t
|
|
|
461 ngx_hash_key(u_char *data, size_t len)
|
|
|
462 {
|
|
|
463 ngx_uint_t i, key;
|
|
|
464
|
|
|
465 key = 0;
|
|
|
466
|
|
|
467 for (i = 0; i < len; i++) {
|
|
|
468 key = ngx_hash(key, data[i]);
|
|
|
469 }
|
|
|
470
|
|
|
471 return key;
|
|
|
472 }
|
|
|
473
|
|
|
474
|
|
|
475 ngx_uint_t
|
|
|
476 ngx_hash_key_lc(u_char *data, size_t len)
|
|
|
477 {
|
|
|
478 ngx_uint_t i, key;
|
|
|
479
|
|
|
480 key = 0;
|
|
|
481
|
|
|
482 for (i = 0; i < len; i++) {
|
|
|
483 key = ngx_hash(key, ngx_tolower(data[i]));
|
|
|
484 }
|
|
|
485
|
|
|
486 return key;
|
|
|
487 }
|
|
|
488
|
|
|
489
|
|
|
490 ngx_int_t
|
|
|
491 ngx_hash0_init(ngx_hash0_t *hash, ngx_pool_t *pool, void *names,
|
|
|
492 ngx_uint_t nelts)
|
|
56
|
493 {
|
|
|
494 u_char *p;
|
|
58
|
495 ngx_str_t *name, *bucket;
|
|
|
496 ngx_uint_t i, n, key, size, best, *test, buckets, min_buckets;
|
|
|
497
|
|
|
498 if (nelts == 0) {
|
|
|
499 for (name = (ngx_str_t *) names;
|
|
|
500 name->len;
|
|
|
501 name = (ngx_str_t *) ((char *) name + hash->bucket_size))
|
|
|
502 {
|
|
|
503 nelts++;
|
|
|
504 }
|
|
|
505 }
|
|
56
|
506
|
|
|
507 test = ngx_alloc(hash->max_size * sizeof(ngx_uint_t), pool->log);
|
|
|
508 if (test == NULL) {
|
|
|
509 return NGX_ERROR;
|
|
|
510 }
|
|
|
511
|
|
|
512 min_buckets = hash->bucket_limit + 1;
|
|
|
513
|
|
|
514 #if (NGX_SUPPRESS_WARN)
|
|
|
515 best = 0;
|
|
|
516 #endif
|
|
|
517
|
|
|
518 for (size = 1; size < hash->max_size; size++) {
|
|
|
519
|
|
|
520 buckets = 0;
|
|
|
521
|
|
|
522 for (i = 0; i < size; i++) {
|
|
|
523 test[i] = 0;
|
|
|
524 }
|
|
|
525
|
|
58
|
526 for (n = 0, name = (ngx_str_t *) names;
|
|
|
527 n < nelts;
|
|
|
528 n++, name = (ngx_str_t *) ((char *) name + hash->bucket_size))
|
|
56
|
529 {
|
|
132
|
530 if (name->data == NULL) {
|
|
|
531 continue;
|
|
|
532 }
|
|
|
533
|
|
56
|
534 key = 0;
|
|
|
535
|
|
58
|
536 for (i = 0; i < name->len; i++) {
|
|
|
537 key += ngx_tolower(name->data[i]);
|
|
56
|
538 }
|
|
|
539
|
|
|
540 key %= size;
|
|
|
541
|
|
|
542 if (test[key] == hash->bucket_limit) {
|
|
|
543 break;
|
|
|
544 }
|
|
|
545
|
|
|
546 test[key]++;
|
|
|
547
|
|
|
548 if (buckets < test[key]) {
|
|
|
549 buckets = test[key];
|
|
|
550 }
|
|
|
551 }
|
|
|
552
|
|
58
|
553 if (n == nelts) {
|
|
56
|
554 if (min_buckets > buckets) {
|
|
|
555 min_buckets = buckets;
|
|
|
556 best = size;
|
|
|
557 }
|
|
|
558
|
|
|
559 if (hash->bucket_limit == 1) {
|
|
|
560 break;
|
|
|
561 }
|
|
|
562 }
|
|
|
563 }
|
|
|
564
|
|
|
565 if (min_buckets == hash->bucket_limit + 1) {
|
|
|
566 ngx_log_error(NGX_LOG_EMERG, pool->log, 0,
|
|
|
567 "could not build the %s hash, you should increase "
|
|
|
568 "either %s_size: %i or %s_bucket_limit: %i",
|
|
|
569 hash->name, hash->name, hash->max_size,
|
|
|
570 hash->name, hash->bucket_limit);
|
|
|
571 ngx_free(test);
|
|
|
572 return NGX_ERROR;
|
|
|
573 }
|
|
|
574
|
|
|
575 hash->buckets = ngx_pcalloc(pool, best * hash->bucket_size);
|
|
|
576 if (hash->buckets == NULL) {
|
|
|
577 ngx_free(test);
|
|
|
578 return NGX_ERROR;
|
|
|
579 }
|
|
|
580
|
|
|
581 if (hash->bucket_limit != 1) {
|
|
|
582
|
|
|
583 for (i = 0; i < best; i++) {
|
|
|
584 test[i] = 0;
|
|
|
585 }
|
|
|
586
|
|
58
|
587 for (n = 0, name = (ngx_str_t *) names;
|
|
|
588 n < nelts;
|
|
|
589 n++, name = (ngx_str_t *) ((char *) name + hash->bucket_size))
|
|
56
|
590 {
|
|
132
|
591 if (name->data == NULL) {
|
|
|
592 continue;
|
|
|
593 }
|
|
|
594
|
|
56
|
595 key = 0;
|
|
|
596
|
|
58
|
597 for (i = 0; i < name->len; i++) {
|
|
|
598 key += ngx_tolower(name->data[i]);
|
|
56
|
599 }
|
|
|
600
|
|
|
601 key %= best;
|
|
|
602
|
|
|
603 test[key]++;
|
|
|
604 }
|
|
|
605
|
|
|
606 for (i = 0; i < best; i++) {
|
|
|
607 if (test[i] == 0) {
|
|
|
608 continue;
|
|
|
609 }
|
|
|
610
|
|
|
611 bucket = ngx_palloc(pool, test[i] * hash->bucket_size);
|
|
|
612 if (bucket == NULL) {
|
|
|
613 ngx_free(test);
|
|
|
614 return NGX_ERROR;
|
|
|
615 }
|
|
|
616
|
|
|
617 hash->buckets[i] = bucket;
|
|
|
618 bucket->len = 0;
|
|
|
619 }
|
|
|
620 }
|
|
|
621
|
|
58
|
622 for (n = 0, name = (ngx_str_t *) names;
|
|
|
623 n < nelts;
|
|
|
624 n++, name = (ngx_str_t *) ((char *) name + hash->bucket_size))
|
|
56
|
625 {
|
|
132
|
626 if (name->data == NULL) {
|
|
|
627 continue;
|
|
|
628 }
|
|
|
629
|
|
56
|
630 key = 0;
|
|
|
631
|
|
58
|
632 for (i = 0; i < name->len; i++) {
|
|
|
633 key += ngx_tolower(name->data[i]);
|
|
56
|
634 }
|
|
|
635
|
|
|
636 key %= best;
|
|
|
637
|
|
|
638 if (hash->bucket_limit == 1) {
|
|
|
639 p = (u_char *) hash->buckets + key * hash->bucket_size;
|
|
58
|
640 ngx_memcpy(p, name, hash->bucket_size);
|
|
56
|
641 continue;
|
|
|
642 }
|
|
|
643
|
|
|
644 for (bucket = hash->buckets[key];
|
|
|
645 bucket->len;
|
|
|
646 bucket = (ngx_str_t *) ((char *) bucket + hash->bucket_size))
|
|
|
647 {
|
|
|
648 bucket->len &= 0x7fffffff;
|
|
|
649 }
|
|
|
650
|
|
58
|
651 ngx_memcpy(bucket, name, hash->bucket_size);
|
|
56
|
652 bucket->len |= 0x80000000;
|
|
|
653 }
|
|
|
654
|
|
|
655 ngx_free(test);
|
|
|
656
|
|
|
657 hash->hash_size = best;
|
|
|
658 hash->min_buckets = min_buckets;
|
|
|
659
|
|
|
660 return NGX_OK;
|
|
|
661 }
|
