PipeWire  0.3.66
map.h
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1 /* PipeWire */
2 /* SPDX-FileCopyrightText: Copyright © 2018 Wim Taymans */
3 /* SPDX-License-Identifier: MIT */
4 
5 #ifndef PIPEWIRE_MAP_H
6 #define PIPEWIRE_MAP_H
7 
8 #ifdef __cplusplus
9 extern "C" {
10 #endif
11 
12 #include <string.h>
13 #include <errno.h>
14 
15 #include <spa/utils/defs.h>
16 #include <pipewire/array.h>
17 
56 union pw_map_item {
57  uintptr_t next; /* next free index */
58  void *data; /* data of this item, must be an even address */
59 };
60 
62 struct pw_map {
63  struct pw_array items; /* an array with the map items */
64  uint32_t free_list; /* first free index */
65 };
66 
68 #define PW_MAP_INIT(extend) ((struct pw_map) { PW_ARRAY_INIT(extend), SPA_ID_INVALID })
69 
76 #define pw_map_get_size(m) pw_array_get_len(&(m)->items, union pw_map_item)
77 #define pw_map_get_item(m,id) pw_array_get_unchecked(&(m)->items,id,union pw_map_item)
78 #define pw_map_item_is_free(item) ((item)->next & 0x1)
79 #define pw_map_id_is_free(m,id) (pw_map_item_is_free(pw_map_get_item(m,id)))
81 #define pw_map_check_id(m,id) ((id) < pw_map_get_size(m))
83 #define pw_map_has_item(m,id) (pw_map_check_id(m,id) && !pw_map_id_is_free(m, id))
84 #define pw_map_lookup_unchecked(m,id) pw_map_get_item(m,id)->data
85 
87 #define PW_MAP_ID_TO_PTR(id) (SPA_UINT32_TO_PTR((id)<<1))
89 #define PW_MAP_PTR_TO_ID(p) (SPA_PTR_TO_UINT32(p)>>1)
90 
96 static inline void pw_map_init(struct pw_map *map, size_t size, size_t extend)
97 {
98  pw_array_init(&map->items, extend * sizeof(union pw_map_item));
99  pw_array_ensure_size(&map->items, size * sizeof(union pw_map_item));
100  map->free_list = SPA_ID_INVALID;
101 }
102 
106 static inline void pw_map_clear(struct pw_map *map)
107 {
108  pw_array_clear(&map->items);
109 }
110 
114 static inline void pw_map_reset(struct pw_map *map)
115 {
116  pw_array_reset(&map->items);
117  map->free_list = SPA_ID_INVALID;
118 }
119 
126 static inline uint32_t pw_map_insert_new(struct pw_map *map, void *data)
127 {
128  union pw_map_item *start, *item;
129  uint32_t id;
130 
131  if (map->free_list != SPA_ID_INVALID) {
132  start = (union pw_map_item *) map->items.data;
133  item = &start[map->free_list >> 1]; /* lsb always 1, see pw_map_remove */
134  map->free_list = item->next;
135  } else {
136  item = (union pw_map_item *) pw_array_add(&map->items, sizeof(union pw_map_item));
137  if (item == NULL)
138  return SPA_ID_INVALID;
139  start = (union pw_map_item *) map->items.data;
140  }
141  item->data = data;
142  id = (item - start);
143  return id;
144 }
145 
153 static inline int pw_map_insert_at(struct pw_map *map, uint32_t id, void *data)
154 {
155  size_t size = pw_map_get_size(map);
156  union pw_map_item *item;
157 
158  if (id > size)
159  return -ENOSPC;
160  else if (id == size) {
161  item = (union pw_map_item *) pw_array_add(&map->items, sizeof(union pw_map_item));
162  if (item == NULL)
163  return -errno;
164  } else {
165  item = pw_map_get_item(map, id);
166  if (pw_map_item_is_free(item))
167  return -EINVAL;
168  }
169  item->data = data;
170  return 0;
171 }
172 
178 static inline void pw_map_remove(struct pw_map *map, uint32_t id)
179 {
180  if (pw_map_id_is_free(map, id))
181  return;
182 
183  pw_map_get_item(map, id)->next = map->free_list;
184  map->free_list = (id << 1) | 1;
185 }
186 
192 static inline void *pw_map_lookup(struct pw_map *map, uint32_t id)
193 {
194  if (SPA_LIKELY(pw_map_check_id(map, id))) {
195  union pw_map_item *item = pw_map_get_item(map, id);
196  if (!pw_map_item_is_free(item))
197  return item->data;
198  }
199  return NULL;
200 }
201 
210 static inline int pw_map_for_each(struct pw_map *map,
211  int (*func) (void *item_data, void *data), void *data)
212 {
213  union pw_map_item *item;
214  int res = 0;
215 
216  pw_array_for_each(item, &map->items) {
218  if ((res = func(item->data, data)) != 0)
219  break;
220  }
221  return res;
222 }
223 
228 #ifdef __cplusplus
229 } /* extern "C" */
230 #endif
231 
232 #endif /* PIPEWIRE_MAP_H */
pipewire/array.h
spa/utils/defs.h
static int pw_array_ensure_size(struct pw_array *arr, size_t size)
Make sure size bytes can be added to the array.
Definition: array.h:96
static void pw_array_init(struct pw_array *arr, size_t extend)
Initialize the array with given extend.
Definition: array.h:75
static void * pw_array_add(struct pw_array *arr, size_t size)
Add ref size bytes to arr.
Definition: array.h:119
static void pw_array_clear(struct pw_array *arr)
Clear the array.
Definition: array.h:83
#define pw_array_for_each(pos, array)
Definition: array.h:57
static void pw_array_reset(struct pw_array *arr)
Reset the array.
Definition: array.h:90
static void pw_map_remove(struct pw_map *map, uint32_t id)
Remove an item at index.
Definition: map.h:185
#define pw_map_check_id(m, id)
Definition: map.h:86
static void * pw_map_lookup(struct pw_map *map, uint32_t id)
Find an item in the map.
Definition: map.h:199
static int pw_map_insert_at(struct pw_map *map, uint32_t id, void *data)
Replace the data in the map at an index.
Definition: map.h:160
#define pw_map_get_size(m)
Get the number of currently allocated elements in the map.
Definition: map.h:81
static uint32_t pw_map_insert_new(struct pw_map *map, void *data)
Insert data in the map.
Definition: map.h:133
static void pw_map_reset(struct pw_map *map)
Reset a map but keep previously allocated storage.
Definition: map.h:121
static void pw_map_clear(struct pw_map *map)
Clear a map and free the data storage.
Definition: map.h:113
#define pw_map_item_is_free(item)
Definition: map.h:83
#define pw_map_id_is_free(m, id)
Definition: map.h:84
static void pw_map_init(struct pw_map *map, size_t size, size_t extend)
Initialize a map.
Definition: map.h:103
static int pw_map_for_each(struct pw_map *map, int(*func)(void *item_data, void *data), void *data)
Iterate all map items.
Definition: map.h:217
#define pw_map_get_item(m, id)
Definition: map.h:82
#define SPA_ID_INVALID
Definition: defs.h:224
#define SPA_LIKELY(x)
Definition: defs.h:341
spa/utils/string.h
Definition: array.h:32
size_t size
length of array in bytes
Definition: array.h:34
size_t extend
number of bytes to extend with
Definition: array.h:36
void * data
pointer to array data
Definition: array.h:33
A map.
Definition: map.h:66
struct pw_array items
Definition: map.h:67
uint32_t free_list
Definition: map.h:68