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1 #include <stdio.h>
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2 #include <string.h>
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3 #include <stdlib.h>
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4 #include "TileHash.h"
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5
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6 #if 0
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7
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8 not used now
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9
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10 static unsigned short PRIME[8] = {
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11 0x002, 0x065, 0x0c7, 0x133, 0x191, 0x1f3, 0x259, 0x2bd,
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12 };
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13
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14 int
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15 TileHash::hash(memaddr data)
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16 {
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17 int value = 0;
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18 int n = 0;
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19 int key;
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20
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21 for (unsigned int i = 0; i < sizeof(memaddr) * 2; i ++) {
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22 key = data & 0xf;
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23 value += key * PRIME[n++ & 7];
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24 data >>= 4;
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25 }
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26
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27 return value % hashSize;
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28 }
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29
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30 TileHash::TileHash(void)
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31 {
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32 hashSize = 263;
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33 tableSize = sizeof(TilePtr)*hashSize;
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34
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35 table = (TilePtr*)malloc(tableSize);
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36 clear();
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37 }
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38
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39 int
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40 TileHash::put(memaddr key, TilePtr data)
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41 {
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42 int hashval = hash(key);
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43
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44 for (int i = 0; i < hashSize/2; i++) {
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45 int index = (hashval + i*i)%hashSize;
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46
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47 if (table[index] == 0) { // 空の table に入れる
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48 table[index] = data;
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49 return index;
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50 }
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51 }
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52
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53 return -1;
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54 }
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55
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56 TilePtr
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57 TileHash::get(memaddr key)
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58 {
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59 int hashval = hash(key);
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60
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61 for (int i = 0; i < hashSize/2; i++) {
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62 int index = (hashval + i*i)%hashSize;
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63
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64 if (table[index] != NULL &&
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65 table[index]->address == key) {
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66 return table[index];
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67 }
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68 }
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69
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70 return NULL;
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71 }
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72
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73 void
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74 TileHash::remove(memaddr key)
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75 {
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76 int hashval = hash(key);
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77
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78 for (int i = 0; i < hashSize/2; i++) {
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79 int index = (hashval + i*i)%hashSize;
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80
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81 if (table[index] != NULL &&
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82 table[index]->address == key) {
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83 table[index] = NULL;
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84 }
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85 }
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86 }
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87
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88 void
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89 TileHash::clear(void)
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90 {
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91 bzero(table, tableSize);
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92 }
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93 #endif
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