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
141
142
143
144
145
|
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include "hashset.h"
#include "idxset.h"
struct hashset_entry {
struct hashset_entry *next, *previous, *bucket_next, *bucket_previous;
unsigned hash;
const void *key;
void *value;
};
struct pa_hashset {
unsigned size;
struct hashset_entry **data;
struct hashset_entry *first_entry;
unsigned n_entries;
unsigned (*hash_func) (const void *p);
int (*compare_func) (const void*a, const void*b);
};
struct pa_hashset *pa_hashset_new(unsigned (*hash_func) (const void *p), int (*compare_func) (const void*a, const void*b)) {
struct pa_hashset *h;
h = malloc(sizeof(struct pa_hashset));
assert(h);
h->data = malloc(sizeof(struct hashset_entry*)*(h->size = 1023));
assert(h->data);
memset(h->data, 0, sizeof(struct hashset_entry*)*(h->size = 1023));
h->first_entry = NULL;
h->n_entries = 0;
h->hash_func = hash_func ? hash_func : pa_idxset_trivial_hash_func;
h->compare_func = compare_func ? compare_func : pa_idxset_trivial_compare_func;
return h;
}
static void remove(struct pa_hashset *h, struct hashset_entry *e) {
assert(e);
if (e->next)
e->next->previous = e->previous;
if (e->previous)
e->previous->next = e->next;
else
h->first_entry = e->next;
if (e->bucket_next)
e->bucket_next->bucket_previous = e->bucket_previous;
if (e->bucket_previous)
e->bucket_previous->bucket_next = e->bucket_next;
else
h->data[e->hash] = e->bucket_next;
free(e);
h->n_entries--;
}
void pa_hashset_free(struct pa_hashset*h, void (*free_func)(void *p, void *userdata), void *userdata) {
assert(h);
while (h->first_entry) {
if (free_func)
free_func(h->first_entry->value, userdata);
remove(h, h->first_entry);
}
free(h->data);
free(h);
}
static struct hashset_entry *get(struct pa_hashset *h, unsigned hash, const void *key) {
struct hashset_entry *e;
for (e = h->data[hash]; e; e = e->bucket_next)
if (h->compare_func(e->key, key) == 0)
return e;
return NULL;
}
int pa_hashset_put(struct pa_hashset *h, const void *key, void *value) {
struct hashset_entry *e;
unsigned hash;
assert(h && key);
hash = h->hash_func(key) % h->size;
if ((e = get(h, hash, key)))
return -1;
e = malloc(sizeof(struct hashset_entry));
assert(e);
e->hash = hash;
e->key = key;
e->value = value;
e->previous = NULL;
e->next = h->first_entry;
if (h->first_entry)
h->first_entry->previous = e;
h->first_entry = e;
e->bucket_previous = NULL;
e->bucket_next = h->data[hash];
if (h->data[hash])
h->data[hash]->bucket_previous = e;
h->data[hash] = e;
h->n_entries ++;
return 0;
}
void* pa_hashset_get(struct pa_hashset *h, const void *key) {
unsigned hash;
struct hashset_entry *e;
assert(h && key);
hash = h->hash_func(key) % h->size;
if (!(e = get(h, hash, key)))
return NULL;
return e->value;
}
int pa_hashset_remove(struct pa_hashset *h, const void *key) {
struct hashset_entry *e;
unsigned hash;
assert(h && key);
hash = h->hash_func(key) % h->size;
if (!(e = get(h, hash, key)))
return 1;
remove(h, e);
return 0;
}
unsigned pa_hashset_ncontents(struct pa_hashset *h) {
return h->n_entries;
}
|
