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141
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1 #include <string.h>
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2 #include <stdlib.h>
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3 #include "TextureHash.h"
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4
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5 int id_count;
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6
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7 TextureHash::TextureHash(void)
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8 {
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9 table = (hashtable*)malloc(sizeof(hashtable)*TABLE_SIZE);
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10
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11 for (int i = 0; i < TABLE_SIZE; i++) {
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12 table[i].tx_id = -1;
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13 table[i].key = NULL;
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14 }
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15 }
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16
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17 TextureHash::~TextureHash(void)
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18 {
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19 free(table);
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20 }
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21
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22 int
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23 TextureHash::hash_function(const char *key)
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24 {
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25 //float value = 0.0;
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26 int value = 0;
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27
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28 for (int i = 0; key[i]; i++) {
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29 value += key[i]*(i+1)*17+1;
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30 }
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31
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32 return value%TABLE_SIZE;
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33 }
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34
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35 int
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36 TextureHash::hash_regist(const char* key)
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37 {
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38 int hash = hash_function(key);
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39
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40 for (int i = 0; ; i++) {
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41 if (table[hash].tx_id == -1) {
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42 table[hash].key = (char*)key;
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43 table[hash].tx_id = id_count++;
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44 return -1;
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45 } else if (strcmp(key, table[hash].key) == 0
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46 && table[hash].tx_id != -1){
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47 return table[hash].tx_id;
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48 }
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49 hash = ((37*hash)^(11*i)) % TABLE_SIZE;
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50 }
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51 }
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