src/server/map.c

Fri, 30 Dec 2011 14:06:56 +0100

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Fri, 30 Dec 2011 14:06:56 +0100
changeset 10
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parent 1
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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 2011 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 <stdio.h>
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30 #include <stdlib.h>
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31 #include <string.h>
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32
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33 #include "map.h"
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34
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35 hashmap_t* hashmap_new(size_t size) {
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36 hashmap_t *map = malloc(sizeof(hashmap_t));
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37 map->map = calloc(size, sizeof(sdlist_t));
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38 map->len = size;
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39
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40 return map;
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41 }
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42
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43 void hashmap_free(hashmap_t *map) {
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44 for(int i=0;i<map->len;i++) {
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45 sdlist_t *list = map->map[0];
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46 while(list != NULL) {
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47 hashmap_elm_t *elm = (hashmap_elm_t*)list->data;
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48 free(elm->key.ptr);
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49 sdlist_t *l = list;
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50 list = list->next;
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51 free(elm);
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52 free(l);
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53 }
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54 }
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55 free(map->map);
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56 free(map);
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57 }
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58
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59
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60 void hashmap_put(hashmap_t *map, sstr_t key, void *value) {
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61 int hash = hashmap_hash(key.ptr, key.length);
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62
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63 sdlist_t *list = map->map[hash%map->len];
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64
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65 sstr_t k = sstrdub(key);
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66
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67 hashmap_elm_t *elm = malloc(sizeof(hashmap_elm_t));
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68 elm->data = value;
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69 elm->hash = hash;
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70 elm->key = k;
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71
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72 map->map[hash%map->len] = sdlist_add(list, elm);
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73 }
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74
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75 void* hashmap_get(hashmap_t *map, sstr_t key) {
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76 int hash = hashmap_hash(key.ptr, key.length);
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77 sdlist_t *list = map->map[hash%map->len];
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78 void *value = NULL;
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79
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80 while (list != NULL) {
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81 hashmap_elm_t *elm = list->data;
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82 if (elm->hash == hash &&
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83 strncmp(key.ptr, elm->key.ptr, key.length) == 0) {
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84 value = elm->data;
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85 break;
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86 }
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87 list = list->next;
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88 }
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89
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90 return value;
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91 }
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92
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93
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94
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95
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96 /* hash function */
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97 int hashmap_hash(char *data, size_t len) {
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98 /* murmur hash 2 */
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99
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100 int m = 0x5bd1e995;
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101 int r = 24;
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102
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103 int h = 25 ^ len;
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104
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105 int i = 0;
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106 while (len >= 4) {
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107 int k = data[i + 0] & 0xFF;
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108 k |= (data[i + 1] & 0xFF) << 8;
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109 k |= (data[i + 2] & 0xFF) << 16;
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110 k |= (data[i + 3] & 0xFF) << 24;
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111
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112 k *= m;
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113 k ^= k >> r;
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114 k *= m;
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115
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116 h *= m;
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117 h ^= k;
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118
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119 i += 4;
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120 len -= 4;
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121 }
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122
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123 switch (len) {
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124 case 3: h ^= (data[i + 2] & 0xFF) << 16;
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125 case 2: h ^= (data[i + 1] & 0xFF) << 8;
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126 case 1: h ^= (data[i + 0] & 0xFF); h *= m;
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127 }
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128
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129 h ^= h >> 13;
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130 h *= m;
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131 h ^= h >> 15;
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132
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133 return h;
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134 }

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