PipeWire  1.4.5
dynamic.h
1 /* Simple Plugin API */
2 /* SPDX-FileCopyrightText: Copyright © 2018 Wim Taymans */
3 /* SPDX-License-Identifier: MIT */
4 
5 #ifndef SPA_POD_DYNAMIC_H
6 #define SPA_POD_DYNAMIC_H
7 
8 #ifdef __cplusplus
9 extern "C" {
10 #endif
11 
12 #include <spa/pod/builder.h>
13 #include <spa/utils/cleanup.h>
14 
15 #ifndef SPA_API_POD_DYNAMIC
16  #ifdef SPA_API_IMPL
17  #define SPA_API_POD_DYNAMIC SPA_API_IMPL
18  #else
19  #define SPA_API_POD_DYNAMIC static inline
20  #endif
21 #endif
22 
24  struct spa_pod_builder b;
25  void *data;
26  uint32_t extend;
27  uint32_t _padding;
28 };
29 
30 static int spa_pod_dynamic_builder_overflow(void *data, uint32_t size)
31 {
33  int32_t old_size = d->b.size;
34  int32_t new_size = SPA_ROUND_UP_N(size, d->extend);
35  void *old_data = d->b.data, *new_data;
36 
37  if (old_data == d->data)
38  d->b.data = NULL;
39  if ((new_data = realloc(d->b.data, new_size)) == NULL)
40  return -errno;
41  if (old_data == d->data && new_data != old_data && old_size > 0)
42  memcpy(new_data, old_data, old_size);
43  d->b.data = new_data;
44  d->b.size = new_size;
45  return 0;
46 }
47 
48 SPA_API_POD_DYNAMIC void spa_pod_dynamic_builder_init(struct spa_pod_dynamic_builder *builder,
49  void *data, uint32_t size, uint32_t extend)
50 {
51  static const struct spa_pod_builder_callbacks spa_pod_dynamic_builder_callbacks = {
53  .overflow = spa_pod_dynamic_builder_overflow
54  };
55  builder->b = SPA_POD_BUILDER_INIT(data, size);
56  spa_pod_builder_set_callbacks(&builder->b, &spa_pod_dynamic_builder_callbacks, builder);
57  builder->extend = extend;
58  builder->data = data;
59 }
60 
61 SPA_API_POD_DYNAMIC void spa_pod_dynamic_builder_clean(struct spa_pod_dynamic_builder *builder)
62 {
63  if (builder->data != builder->b.data)
64  free(builder->b.data);
65 }
66 
67 SPA_DEFINE_AUTO_CLEANUP(spa_pod_dynamic_builder, struct spa_pod_dynamic_builder, {
68  spa_pod_dynamic_builder_clean(thing);
69 })
70 
71 #ifdef __cplusplus
72 } /* extern "C" */
73 #endif
74 
75 #endif /* SPA_POD_DYNAMIC_H */
spa/pod/builder.h
#define SPA_POD_BUILDER_INIT(buffer, size)
Definition: builder.h:72
#define SPA_VERSION_POD_BUILDER_CALLBACKS
Definition: builder.h:57
SPA_API_POD_BUILDER void spa_pod_builder_set_callbacks(struct spa_pod_builder *builder, const struct spa_pod_builder_callbacks *callbacks, void *data)
Definition: builder.h:81
#define SPA_ROUND_UP_N(num, align)
Definition: defs.h:360
Definition: builder.h:55
uint32_t version
Definition: builder.h:58
Definition: builder.h:63
void * data
Definition: builder.h:64
uint32_t size
Definition: builder.h:65
Definition: dynamic.h:29
uint32_t extend
Definition: dynamic.h:32
uint32_t _padding
Definition: dynamic.h:33
struct spa_pod_builder b
Definition: dynamic.h:30
void * data
Definition: dynamic.h:31