ucx/map.c

Tue, 03 Sep 2013 12:08:35 +0200

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Tue, 03 Sep 2013 12:08:35 +0200
changeset 38
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parent 17
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child 70
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permissions
-rw-r--r--

code cleanup + experimental login prompt

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
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4 * Copyright 2013 Olaf Wintermann. All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 */
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28
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29 #include <stdlib.h>
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30 #include <string.h>
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31
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32 #include "map.h"
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33
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34 UcxMap *ucx_map_new(size_t size) {
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35 return ucx_map_new_a(NULL, size);
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36 }
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37
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38 UcxMap *ucx_map_new_a(UcxAllocator *allocator, size_t size) {
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39 if(size == 0) {
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40 size = 16;
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41 }
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42
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43 if(!allocator) {
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44 allocator = ucx_default_allocator();
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45 }
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46
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47 UcxMap *map = (UcxMap*)allocator->malloc(allocator->pool, sizeof(UcxMap));
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48 if (!map) {
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49 return NULL;
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50 }
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51
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52 map->allocator = allocator;
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53 map->map = (UcxMapElement**)allocator->calloc(
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54 allocator->pool,
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55 size,
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56 sizeof(UcxMapElement*));
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57 if(map->map == NULL) {
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58 allocator->free(allocator->pool, map);
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59 return NULL;
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60 }
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61 map->size = size;
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62 map->count = 0;
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63
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64 return map;
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65 }
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66
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67 static void ucx_map_free_elmlist(UcxMap *map) {
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68 for (size_t n = 0 ; n < map->size ; n++) {
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69 UcxMapElement *elem = map->map[n];
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70 if (elem != NULL) {
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71 do {
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72 UcxMapElement *next = elem->next;
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73 map->allocator->free(map->allocator->pool, elem->key.data);
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74 map->allocator->free(map->allocator->pool, elem);
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75 elem = next;
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76 } while (elem != NULL);
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77 }
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78 }
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79 map->allocator->free(map->allocator->pool, map->map);
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80 }
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81
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82 void ucx_map_free(UcxMap *map) {
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83 ucx_map_free_elmlist(map);
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84 map->allocator->free(map->allocator->pool, map);
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85 }
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86
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87 int ucx_map_copy(UcxMap *restrict from, UcxMap *restrict to,
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88 copy_func fnc, void *data) {
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89 UcxMapIterator i = ucx_map_iterator(from);
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90 void *value;
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91 UCX_MAP_FOREACH(key, value, i) {
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92 if (ucx_map_put(to, key, fnc ? fnc(value, data) : value)) {
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93 return 1;
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94 }
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95 }
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96 return 0;
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97 }
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98
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99 UcxMap *ucx_map_clone(UcxMap *map, copy_func fnc, void *data) {
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100 size_t bs = (map->count * 5) >> 1;
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101 UcxMap *newmap = ucx_map_new(bs > map->size ? bs : map->size);
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102 if (!newmap) {
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103 return NULL;
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104 }
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105 ucx_map_copy(map, newmap, fnc, data);
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106 return newmap;
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107 }
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108
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109 int ucx_map_rehash(UcxMap *map) {
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110 size_t load = (map->size * 3) >> 2;
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111 if (map->count > load) {
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112 UcxMap oldmap;
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113 oldmap.map = map->map;
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114 oldmap.size = map->size;
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115 oldmap.count = map->count;
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116 oldmap.allocator = map->allocator;
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117
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118 map->size = (map->count * 5) >> 1;
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119 map->map = (UcxMapElement**)map->allocator->calloc(
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120 map->allocator->pool,
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121 map->size,
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122 sizeof(UcxMapElement*));
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123 if (!map->map) {
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124 *map = oldmap;
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125 return 1;
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126 }
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127 map->count = 0;
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128 ucx_map_copy(&oldmap, map, NULL, NULL);
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129
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130 /* free the UcxMapElement list of oldmap */
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131 ucx_map_free_elmlist(&oldmap);
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132 }
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133 return 0;
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134 }
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135
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136 int ucx_map_put(UcxMap *map, UcxKey key, void *data) {
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137 UcxAllocator *allocator = map->allocator;
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138
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139 if (key.hash == 0) {
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140 key.hash = ucx_hash((char*)key.data, key.len);
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141 }
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142
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143 size_t slot = key.hash%map->size;
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144 UcxMapElement *restrict elm = map->map[slot];
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145 UcxMapElement *restrict prev = NULL;
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146
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diff changeset
147 while (elm && elm->key.hash < key.hash) {
1
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148 prev = elm;
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149 elm = elm->next;
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150 }
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151
17
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diff changeset
152 if (!elm || elm->key.hash != key.hash) {
5
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153 UcxMapElement *e = (UcxMapElement*)allocator->malloc(
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diff changeset
154 allocator->pool,
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diff changeset
155 sizeof(UcxMapElement));
17
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156 if (!e) {
1
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157 return -1;
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158 }
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159 e->key.data = NULL;
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160 if (prev) {
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161 prev->next = e;
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162 } else {
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163 map->map[slot] = e;
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164 }
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165 e->next = elm;
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166 elm = e;
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167 }
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168
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diff changeset
169 if (!elm->key.data) {
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diff changeset
170 void *kd = allocator->malloc(allocator->pool, key.len);
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171 if (!kd) {
1
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172 return -1;
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173 }
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174 memcpy(kd, key.data, key.len);
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175 key.data = kd;
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176 elm->key = key;
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177 map->count++;
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178 }
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179 elm->data = data;
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180
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181 return 0;
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182 }
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183
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184 void* ucx_map_get_and_remove(UcxMap *map, UcxKey key, _Bool remove) {
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185 if(key.hash == 0) {
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186 key.hash = ucx_hash((char*)key.data, key.len);
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187 }
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188
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189 size_t slot = key.hash%map->size;
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190 UcxMapElement *restrict elm = map->map[slot];
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191 UcxMapElement *restrict pelm = NULL;
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192 while (elm && elm->key.hash <= key.hash) {
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193 if(elm->key.hash == key.hash) {
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194 int n = (key.len > elm->key.len) ? elm->key.len : key.len;
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195 if (memcmp(elm->key.data, key.data, n) == 0) {
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diff changeset
196 void *data = elm->data;
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197 if (remove) {
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198 if (pelm) {
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199 pelm->next = elm->next;
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200 } else {
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201 map->map[slot] = elm->next;
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202 }
17
11dffb40cd91 new dav_query function
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parents: 5
diff changeset
203 map->allocator->free(map->allocator->pool, elm->key.data);
5
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204 map->allocator->free(map->allocator->pool, elm);
1
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205 map->count--;
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206 }
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207
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208 return data;
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209 }
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210 }
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211 pelm = elm;
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212 elm = pelm->next;
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213 }
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214
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215 return NULL;
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216 }
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217
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218 void *ucx_map_get(UcxMap *map, UcxKey key) {
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219 return ucx_map_get_and_remove(map, key, 0);
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220 }
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221
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222 void *ucx_map_remove(UcxMap *map, UcxKey key) {
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223 return ucx_map_get_and_remove(map, key, 1);
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224 }
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225
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226 UcxKey ucx_key(void *data, size_t len) {
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227 UcxKey key;
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228 key.data = data;
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229 key.len = len;
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230 key.hash = ucx_hash((const char*) data, len);
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231 return key;
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232 }
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233
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234
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diff changeset
235 int ucx_hash(const char *data, size_t len) {
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parents:
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236 /* murmur hash 2 */
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237
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diff changeset
238 int m = 0x5bd1e995;
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239 int r = 24;
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240
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diff changeset
241 int h = 25 ^ len;
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242
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diff changeset
243 int i = 0;
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parents:
diff changeset
244 while (len >= 4) {
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parents:
diff changeset
245 int k = data[i + 0] & 0xFF;
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diff changeset
246 k |= (data[i + 1] & 0xFF) << 8;
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diff changeset
247 k |= (data[i + 2] & 0xFF) << 16;
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parents:
diff changeset
248 k |= (data[i + 3] & 0xFF) << 24;
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249
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diff changeset
250 k *= m;
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parents:
diff changeset
251 k ^= k >> r;
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diff changeset
252 k *= m;
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diff changeset
253
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diff changeset
254 h *= m;
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parents:
diff changeset
255 h ^= k;
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parents:
diff changeset
256
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parents:
diff changeset
257 i += 4;
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parents:
diff changeset
258 len -= 4;
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parents:
diff changeset
259 }
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diff changeset
260
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parents:
diff changeset
261 switch (len) {
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parents:
diff changeset
262 case 3: h ^= (data[i + 2] & 0xFF) << 16;
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parents:
diff changeset
263 /* no break */
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parents:
diff changeset
264 case 2: h ^= (data[i + 1] & 0xFF) << 8;
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parents:
diff changeset
265 /* no break */
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parents:
diff changeset
266 case 1: h ^= (data[i + 0] & 0xFF); h *= m;
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parents:
diff changeset
267 /* no break */
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268 }
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269
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270 h ^= h >> 13;
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diff changeset
271 h *= m;
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diff changeset
272 h ^= h >> 15;
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273
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274 return h;
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parents:
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275 }
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276
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277 UcxMapIterator ucx_map_iterator(UcxMap *map) {
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diff changeset
278 UcxMapIterator i;
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279 i.map = map;
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280 i.cur = NULL;
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diff changeset
281 i.index = 0;
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282 return i;
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283 }
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284
5
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diff changeset
285 int ucx_map_iter_next(UcxMapIterator *i, UcxKey *key, void **elm) {
1
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286 UcxMapElement *e = i->cur;
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287
17
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288 if (e) {
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diff changeset
289 e = e->next;
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diff changeset
290 } else {
1
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291 e = i->map->map[0];
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292 }
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diff changeset
293
17
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diff changeset
294 while (i->index < i->map->size) {
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diff changeset
295 if (e) {
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diff changeset
296 if (e->data) {
1
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diff changeset
297 i->cur = e;
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298 *elm = e->data;
5
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diff changeset
299 *key = e->key;
17
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diff changeset
300 return 1;
1
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parents:
diff changeset
301 }
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parents:
diff changeset
302
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parents:
diff changeset
303 e = e->next;
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parents:
diff changeset
304 } else {
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parents:
diff changeset
305 i->index++;
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parents:
diff changeset
306
17
11dffb40cd91 new dav_query function
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parents: 5
diff changeset
307 if (i->index < i->map->size) {
1
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Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
diff changeset
308 e = i->map->map[i->index];
1bcaac272cdf added existing source code
Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
diff changeset
309 }
1bcaac272cdf added existing source code
Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
diff changeset
310 }
1bcaac272cdf added existing source code
Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
diff changeset
311 }
1bcaac272cdf added existing source code
Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
diff changeset
312
17
11dffb40cd91 new dav_query function
Olaf Wintermann <olaf.wintermann@gmail.com>
parents: 5
diff changeset
313 return 0;
1
1bcaac272cdf added existing source code
Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
diff changeset
314 }
1bcaac272cdf added existing source code
Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
diff changeset
315

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