1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
/*
expat XML parser
Copyright (C) 1998 James Clark
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "xmldef.h"
#ifdef XML_UNICODE_WCHAR_T
#ifndef XML_UNICODE
#define XML_UNICODE
#endif
#endif
#include "hashtable.h"
#define INIT_SIZE 64
static
int keyeq(KEY s1, KEY s2)
{
for (; *s1 == *s2; s1++, s2++)
if (*s1 == 0)
return 1;
return 0;
}
static
unsigned long hash(KEY s)
{
unsigned long h = 0;
while (*s)
h = (h << 5) + h + (unsigned char)*s++;
return h;
}
NAMED *lookup(HASH_TABLE *table, KEY name, size_t createSize)
{
size_t i;
if (table->size == 0) {
if (!createSize)
return 0;
table->v = calloc(INIT_SIZE, sizeof(NAMED *));
if (!table->v)
return 0;
table->size = INIT_SIZE;
table->usedLim = INIT_SIZE / 2;
i = hash(name) & (table->size - 1);
}
else {
unsigned long h = hash(name);
for (i = h & (table->size - 1);
table->v[i];
i == 0 ? i = table->size - 1 : --i) {
if (keyeq(name, table->v[i]->name))
return table->v[i];
}
if (!createSize)
return 0;
if (table->used == table->usedLim) {
/* check for overflow */
size_t newSize = table->size * 2;
NAMED **newV = calloc(newSize, sizeof(NAMED *));
if (!newV)
return 0;
for (i = 0; i < table->size; i++)
if (table->v[i]) {
size_t j;
for (j = hash(table->v[i]->name) & (newSize - 1);
newV[j];
j == 0 ? j = newSize - 1 : --j)
;
newV[j] = table->v[i];
}
free(table->v);
table->v = newV;
table->size = newSize;
table->usedLim = newSize/2;
for (i = h & (table->size - 1);
table->v[i];
i == 0 ? i = table->size - 1 : --i)
;
}
}
table->v[i] = calloc(1, createSize);
if (!table->v[i])
return 0;
table->v[i]->name = name;
(table->used)++;
return table->v[i];
}
void hashTableDestroy(HASH_TABLE *table)
{
size_t i;
for (i = 0; i < table->size; i++) {
NAMED *p = table->v[i];
if (p)
free(p);
}
free(table->v);
}
void hashTableInit(HASH_TABLE *p)
{
p->size = 0;
p->usedLim = 0;
p->used = 0;
p->v = 0;
}
void hashTableIterInit(HASH_TABLE_ITER *iter, const HASH_TABLE *table)
{
iter->p = table->v;
iter->end = iter->p + table->size;
}
NAMED *hashTableIterNext(HASH_TABLE_ITER *iter)
{
while (iter->p != iter->end) {
NAMED *tem = *(iter->p)++;
if (tem)
return tem;
}
return 0;
}
|
