src/server/ucx/map.c

Sun, 26 Feb 2012 19:51:14 +0100

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Sun, 26 Feb 2012 19:51:14 +0100
changeset 26
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parent 21
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child 31
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permissions
-rw-r--r--

Minimal webdav support

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1 /*
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2 *
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3 */
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4
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5 #include <stdio.h>
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6 #include <stdlib.h>
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7 #include <string.h>
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8
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9 #include "map.h"
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10
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11 UcxMap *ucx_map_new(size_t size) {
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12 UcxMap *map = (UcxMap*)malloc(sizeof(UcxMap));
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13 if(map == NULL) {
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14 return NULL;
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15 }
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16
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17 map->map = (UcxMapElement*)calloc(size, sizeof(UcxMapElement));
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18 if(map->map == NULL) {
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19 free(map);
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20 return NULL;
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21 }
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22 map->size = size;
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23
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24 return map;
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25 }
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26
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27 int ucx_map_put(UcxMap *map, UcxKey key, void *data) {
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28 if(key.hash == 0) {
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29 key.hash = ucx_hash((char*)key.data, key.len);
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30 }
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31 void *kd = calloc(1, key.len);
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32 memcpy(kd, key.data, key.len);
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33 key.data = kd;
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34
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35 UcxMapElement *elm = &map->map[key.hash%map->size];
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36 if(elm->key.hash != 0) {
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37 UcxMapElement *e = elm;
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38 for(;;) {
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39 /* check if the key is already in use */
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40 if(key.hash == e->key.hash) {
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41 int n = (key.len > elm->key.len) ? elm->key.len : key.len;
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42 if(memcmp(elm->key.data, key.data, n) == 0) {
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43 /* use elm as storage place */
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44 elm = e;
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45 break;
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46 }
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47 }
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48
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49 /* check if this is the last element */
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50 if(e->next == NULL) {
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51 /* create new element */
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52 UcxMapElement *en = (UcxMapElement*)malloc(sizeof(UcxMapElement));
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53 if(en == NULL) {
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54 return -1;
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55 }
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56 e->next = en;
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57 elm = en;
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58 break;
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59 }
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60
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61 e = e->next;
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62 }
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63 }
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64
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65 elm->key = key;
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66 elm->data = data;
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67
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68 return 0;
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69 }
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70
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71 void* ucx_map_get(UcxMap *map, UcxKey key) {
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72 if(key.hash == 0) {
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73 key.hash = ucx_hash((char*)key.data, key.len);
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74 }
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75
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76 UcxMapElement *elm = &map->map[key.hash%map->size];
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77 while(elm != NULL) {
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78 if(elm->key.hash == key.hash) {
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79 int n = (key.len > elm->key.len) ? elm->key.len : key.len;
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80 if(memcmp(elm->key.data, key.data, n) == 0) {
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81 return elm->data;
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82 }
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83 }
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84 elm = elm->next;
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85 }
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86
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87 return NULL;
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88 }
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89
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90 UcxKey ucx_key(void *data, size_t len) {
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91 UcxKey key;
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92 key.data = data;
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93 key.len = len;
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94 key.hash = ucx_hash(data, len);
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95 return key;
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96 }
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97
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98
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99 int ucx_hash(char *data, size_t len) {
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100 /* murmur hash 2 */
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101
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102 int m = 0x5bd1e995;
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103 int r = 24;
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104
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105 int h = 25 ^ len;
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106
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107 int i = 0;
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108 while (len >= 4) {
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109 int k = data[i + 0] & 0xFF;
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110 k |= (data[i + 1] & 0xFF) << 8;
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111 k |= (data[i + 2] & 0xFF) << 16;
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112 k |= (data[i + 3] & 0xFF) << 24;
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113
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114 k *= m;
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115 k ^= k >> r;
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116 k *= m;
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117
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118 h *= m;
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119 h ^= k;
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120
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121 i += 4;
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122 len -= 4;
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123 }
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124
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125 switch (len) {
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126 case 3: h ^= (data[i + 2] & 0xFF) << 16;
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127 case 2: h ^= (data[i + 1] & 0xFF) << 8;
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128 case 1: h ^= (data[i + 0] & 0xFF); h *= m;
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129 }
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130
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131 h ^= h >> 13;
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132 h *= m;
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133 h ^= h >> 15;
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134
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135 return h;
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136 }

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