|
283
|
1 #include <stdio.h>
|
|
|
2 #include <string.h>
|
|
|
3 #include <stdlib.h>
|
|
|
4 #include "TileHash.h"
|
|
|
5
|
|
|
6 static unsigned short PRIME[8] = {
|
|
|
7 0x002, 0x065, 0x0c7, 0x133, 0x191, 0x1f3, 0x259, 0x2bd,
|
|
|
8 };
|
|
|
9
|
|
|
10 int
|
|
|
11 TileHash::hash(uint32 data)
|
|
|
12 {
|
|
|
13 int value = 0;
|
|
|
14 int n = 0;
|
|
|
15 int key;
|
|
|
16
|
|
|
17 for (int i = 0; i < 8; i ++) {
|
|
|
18 key = data & 0xf;
|
|
|
19 value += key * PRIME[n++];
|
|
|
20 data >>= 4;
|
|
|
21 }
|
|
|
22
|
|
|
23 return value % hashSize;
|
|
|
24 }
|
|
|
25
|
|
|
26 TileHash::TileHash(void)
|
|
|
27 {
|
|
|
28 hashSize = 263;
|
|
|
29 tableSize = sizeof(TilePtr)*hashSize;
|
|
|
30
|
|
|
31 table = (TilePtr*)malloc(tableSize);
|
|
|
32 clear();
|
|
|
33 }
|
|
|
34
|
|
|
35 int
|
|
|
36 TileHash::put(uint32 *key, TilePtr data)
|
|
|
37 {
|
|
|
38 int hashval = hash((uint32)key);
|
|
|
39
|
|
|
40 for (int i = 0; i < hashSize/2; i++) {
|
|
|
41 int index = (hashval + i*i)%hashSize;
|
|
|
42
|
|
|
43 if (table[index] == 0) { // 空の table に入れる
|
|
|
44 table[index] = data;
|
|
|
45 return index;
|
|
|
46 }
|
|
|
47 }
|
|
|
48
|
|
|
49 return -1;
|
|
|
50 }
|
|
|
51
|
|
|
52 TilePtr
|
|
|
53 TileHash::get(uint32 *key)
|
|
|
54 {
|
|
|
55 int hashval = hash((uint32)key);
|
|
|
56
|
|
|
57 for (int i = 0; i < hashSize/2; i++) {
|
|
|
58 int index = (hashval + i*i)%hashSize;
|
|
|
59
|
|
|
60 if (table[index] != NULL &&
|
|
|
61 table[index]->texture_addr == key) {
|
|
|
62 return table[index];
|
|
|
63 }
|
|
|
64 }
|
|
|
65
|
|
|
66 return NULL;
|
|
|
67 }
|
|
|
68
|
|
|
69 void
|
|
|
70 TileHash::remove(uint32 *key)
|
|
|
71 {
|
|
|
72 int hashval = hash((uint32)key);
|
|
|
73
|
|
|
74 for (int i = 0; i < hashSize/2; i++) {
|
|
|
75 int index = (hashval + i*i)%hashSize;
|
|
|
76
|
|
|
77 if (table[index] != NULL &&
|
|
|
78 table[index]->texture_addr == key) {
|
|
|
79 table[index] = NULL;
|
|
|
80 }
|
|
|
81 }
|
|
|
82 }
|
|
|
83
|
|
|
84 void
|
|
|
85 TileHash::clear(void)
|
|
|
86 {
|
|
|
87 bzero(table, tableSize);
|
|
|
88 }
|
