PipeWire: spa/utils/dict.h Source File

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dict.h
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1/* Simple Plugin API
2 *
3 * Copyright © 2018 Wim Taymans
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice (including the next
13 * paragraph) shall be included in all copies or substantial portions of the
14 * Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 * DEALINGS IN THE SOFTWARE.
23 */
24
25#ifndef SPA_DICT_H
26#define SPA_DICT_H
27
28#ifdef __cplusplus
29extern "C" {
30#endif
31
32#include <string.h>
33
34#include <spa/utils/defs.h>
35
46struct spa_dict_item {
47 const char *key;
48 const char *value;
49};
50
51#define SPA_DICT_ITEM_INIT(key,value) (struct spa_dict_item) { key, value }
52
53 struct spa_dict {
54#define SPA_DICT_FLAG_SORTED (1<<0)
55 uint32_t flags;
56 uint32_t n_items;
57 const struct spa_dict_item *items;
58};
59
60#define SPA_DICT_INIT(items,n_items) (struct spa_dict) { 0, n_items, items }
61#define SPA_DICT_INIT_ARRAY(items) (struct spa_dict) { 0, SPA_N_ELEMENTS(items), items }
62
63#define spa_dict_for_each(item, dict) \
64 for ((item) = (dict)->items; \
65 (item) < &(dict)->items[(dict)->n_items]; \
66 (item)++)
67
68 static inline int spa_dict_item_compare(const void *i1, const void *i2)
69{
70 const struct spa_dict_item *it1 = (const struct spa_dict_item *)i1,
71 *it2 = (const struct spa_dict_item *)i2;
72 return strcmp(it1->key, it2->key);
73}
74
75static inline void spa_dict_qsort(struct spa_dict *dict)
76{
77 if (dict->n_items > 0)
78 qsort((void*)dict->items, dict->n_items, sizeof(struct spa_dict_item),
79 spa_dict_item_compare);
80 SPA_FLAG_SET(dict->flags, SPA_DICT_FLAG_SORTED);
81}
82
83static inline const struct spa_dict_item *spa_dict_lookup_item(const struct spa_dict *dict,
84 const char *key)
85{
86 const struct spa_dict_item *item;
87
88 if (SPA_FLAG_IS_SET(dict->flags, SPA_DICT_FLAG_SORTED) &&
89 dict->n_items > 0) {
90 struct spa_dict_item k = SPA_DICT_ITEM_INIT(key, NULL);
91 item = (const struct spa_dict_item *)bsearch(&k,
92 (const void *) dict->items, dict->n_items,
93 sizeof(struct spa_dict_item),
94 spa_dict_item_compare);
95 if (item != NULL)
96 return item;
97 } else {
98 spa_dict_for_each(item, dict) {
99 if (!strcmp(item->key, key))
100 return item;
101 }
102 }
103 return NULL;
104}
105
106static inline const char *spa_dict_lookup(const struct spa_dict *dict, const char *key)
107{
108 const struct spa_dict_item *item = spa_dict_lookup_item(dict, key);
109 return item ? item->value : NULL;
110}
111
116#ifdef __cplusplus
117} /* extern "C" */
118#endif
119
120#endif /* SPA_DICT_H */
defs.h
spa/utils/defs.h
SPA_DICT_ITEM_INIT
#define SPA_DICT_ITEM_INIT(key, value)
Definition: dict.h:57
spa_dict_qsort
static void spa_dict_qsort(struct spa_dict *dict)
Definition: dict.h:84
spa_dict_item_compare
static int spa_dict_item_compare(const void *i1, const void *i2)
Definition: dict.h:77
spa_dict_lookup_item
static const struct spa_dict_item * spa_dict_lookup_item(const struct spa_dict *dict, const char *key)
Definition: dict.h:92
spa_dict_lookup
static const char * spa_dict_lookup(const struct spa_dict *dict, const char *key)
Definition: dict.h:115
SPA_DICT_FLAG_SORTED
#define SPA_DICT_FLAG_SORTED
items are sorted
Definition: dict.h:61
spa_dict_for_each
#define spa_dict_for_each(item, dict)
Definition: dict.h:72
SPA_FLAG_SET
#define SPA_FLAG_SET(field, flag)
Definition: defs.h:84
SPA_FLAG_IS_SET
#define SPA_FLAG_IS_SET(field, flag)
Definition: defs.h:82
string.h
spa/utils/string.h
spa_dict_item
Definition: dict.h:51
spa_dict_item::key
const char * key
Definition: dict.h:52
spa_dict_item::value
const char * value
Definition: dict.h:53
spa_dict
Definition: dict.h:59
spa_dict::items
const struct spa_dict_item * items
Definition: dict.h:64
spa_dict::n_items
uint32_t n_items
Definition: dict.h:63
spa_dict::flags
uint32_t flags
Definition: dict.h:62