Mercurial > hg > Members > kono > Cerium

annotate TaskManager/Test/test_render/task/TileHash.cpp @ 387:5e2d30bfbf23

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no compile error but not worked.
author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Thu, 06 Aug 2009 22:40:52 +0900
parents eab18aa0c7f6
children
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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 static unsigned short PRIME[8] = {
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7 0x002, 0x065, 0x0c7, 0x133, 0x191, 0x1f3, 0x259, 0x2bd,
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8 };
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9
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10 int
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11 TileHash::hash(memaddr data)
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12 {
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13 int value = 0;
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14 int n = 0;
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15 int key;
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16
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17 for (unsigned int i = 0; i < sizeof(memaddr) * 2; i ++) {
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18 key = data & 0xf;
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19 value += key * PRIME[n++ & 7];
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20 data >>= 4;
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21 }
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22
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23 return value % hashSize;
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24 }
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25
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26 TileHash::TileHash(void)
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27 {
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28 hashSize = 263;
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29 tableSize = sizeof(TilePtr)*hashSize;
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30
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31 table = (TilePtr*)malloc(tableSize);
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32 clear();
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33 }
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34
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35 int
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36 TileHash::put(memaddr key, TilePtr data)
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37 {
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38 int hashval = hash(key);
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39
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40 for (int i = 0; i < hashSize/2; i++) {
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41 int index = (hashval + i*i)%hashSize;
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42
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43 if (table[index] == 0) { // 空の table に入れる
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44 table[index] = data;
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45 return index;
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46 }
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47 }
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48
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49 return -1;
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50 }
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51
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52 TilePtr
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53 TileHash::get(memaddr key)
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54 {
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55 int hashval = hash(key);
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56
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57 for (int i = 0; i < hashSize/2; i++) {
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58 int index = (hashval + i*i)%hashSize;
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59
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60 if (table[index] != NULL &&
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61 table[index]->address == key) {
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62 return table[index];
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63 }
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64 }
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65
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66 return NULL;
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67 }
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68
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69 void
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70 TileHash::remove(memaddr key)
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71 {
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72 int hashval = hash(key);
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73
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74 for (int i = 0; i < hashSize/2; i++) {
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75 int index = (hashval + i*i)%hashSize;
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76
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77 if (table[index] != NULL &&
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78 table[index]->address == key) {
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79 table[index] = NULL;
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80 }
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81 }
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82 }
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83
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84 void
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85 TileHash::clear(void)
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86 {
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87 bzero(table, tableSize);
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88 }