PipeWire  0.3.45
array.h
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24 
25 #ifndef PIPEWIRE_ARRAY_H
26 #define PIPEWIRE_ARRAY_H
27 
28 #ifdef __cplusplus
29 extern "C" {
30 #endif
31 
32 #include <errno.h>
33 
34 #include <spa/utils/defs.h>
35 
48 struct pw_array {
49  void *data;
50  size_t size;
51  size_t alloc;
52  size_t extend;
53 };
54 
55 #define PW_ARRAY_INIT(extend) (struct pw_array) { NULL, 0, 0, extend }
56 
57 #define pw_array_get_len_s(a,s) ((a)->size / (s))
58 #define pw_array_get_unchecked_s(a,idx,s,t) SPA_PTROFF((a)->data,(idx)*(s),t)
59 #define pw_array_check_index_s(a,idx,s) ((idx) < pw_array_get_len_s(a,s))
60 
62 #define pw_array_get_len(a,t) pw_array_get_len_s(a,sizeof(t))
64 #define pw_array_get_unchecked(a,idx,t) pw_array_get_unchecked_s(a,idx,sizeof(t),t)
66 #define pw_array_check_index(a,idx,t) pw_array_check_index_s(a,idx,sizeof(t))
67 
68 #define pw_array_first(a) ((a)->data)
69 #define pw_array_end(a) SPA_PTROFF((a)->data, (a)->size, void)
70 #define pw_array_check(a,p) (SPA_PTROFF(p,sizeof(*p),void) <= pw_array_end(a))
71 
72 #define pw_array_for_each(pos, array) \
73  for (pos = (__typeof__(pos)) pw_array_first(array); \
74  pw_array_check(array, pos); \
75  (pos)++)
76 
77 #define pw_array_consume(pos, array) \
78  for (pos = (__typeof__(pos)) pw_array_first(array); \
79  pw_array_check(array, pos); \
80  pos = (__typeof__(pos)) pw_array_first(array))
81 
82 #define pw_array_remove(a,p) \
83 ({ \
84  (a)->size -= sizeof(*(p)); \
85  memmove(p, SPA_PTROFF((p), sizeof(*(p)), void), \
86  SPA_PTRDIFF(pw_array_end(a),(p))); \
87 })
88 
90 static inline void pw_array_init(struct pw_array *arr, size_t extend)
91 {
92  arr->data = NULL;
93  arr->size = arr->alloc = 0;
94  arr->extend = extend;
95 }
96 
98 static inline void pw_array_clear(struct pw_array *arr)
99 {
100  free(arr->data);
101  pw_array_init(arr, arr->extend);
102 }
103 
105 static inline void pw_array_reset(struct pw_array *arr)
106 {
107  arr->size = 0;
108 }
109 
111 static inline int pw_array_ensure_size(struct pw_array *arr, size_t size)
112 {
113  size_t alloc, need;
114 
115  alloc = arr->alloc;
116  need = arr->size + size;
117 
118  if (SPA_UNLIKELY(alloc < need)) {
119  void *data;
120  alloc = SPA_MAX(alloc, arr->extend);
121  spa_assert(alloc != 0); /* forgot pw_array_init */
122  while (alloc < need)
123  alloc *= 2;
124  if (SPA_UNLIKELY((data = realloc(arr->data, alloc)) == NULL))
125  return -errno;
126  arr->data = data;
127  arr->alloc = alloc;
128  }
129  return 0;
130 }
131 
134 static inline void *pw_array_add(struct pw_array *arr, size_t size)
135 {
136  void *p;
137 
138  if (pw_array_ensure_size(arr, size) < 0)
139  return NULL;
140 
141  p = SPA_PTROFF(arr->data, arr->size, void);
142  arr->size += size;
143 
144  return p;
145 }
146 
149 static inline void *pw_array_add_fixed(struct pw_array *arr, size_t size)
150 {
151  void *p;
152 
153  if (SPA_UNLIKELY(arr->alloc < arr->size + size)) {
154  errno = ENOSPC;
155  return NULL;
156  }
157 
158  p = SPA_PTROFF(arr->data, arr->size, void);
159  arr->size += size;
160 
161  return p;
162 }
163 
165 #define pw_array_add_ptr(a,p) \
166  *((void**) pw_array_add(a, sizeof(void*))) = (p)
167 
172 #ifdef __cplusplus
173 } /* extern "C" */
174 #endif
175 
176 #endif /* 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:116
static void pw_array_init(struct pw_array *arr, size_t extend)
Initialize the array with given extend.
Definition: array.h:95
static void * pw_array_add(struct pw_array *arr, size_t size)
Add ref size bytes to arr.
Definition: array.h:139
static void pw_array_clear(struct pw_array *arr)
Clear the array.
Definition: array.h:103
static void * pw_array_add_fixed(struct pw_array *arr, size_t size)
Add ref size bytes to arr.
Definition: array.h:154
static void pw_array_reset(struct pw_array *arr)
Reset the array.
Definition: array.h:110
#define SPA_UNLIKELY(x)
Definition: defs.h:315
#define SPA_PTROFF(ptr_, offset_, type_)
Return the address (buffer + offset) as pointer of type.
Definition: defs.h:183
#define spa_assert(expr)
Definition: defs.h:370
#define SPA_MAX(a, b)
Definition: defs.h:152
Definition: array.h:52
size_t size
length of array in bytes
Definition: array.h:54
size_t alloc
number of allocated memory in data
Definition: array.h:55
size_t extend
number of bytes to extend with
Definition: array.h:56
void * data
pointer to array data
Definition: array.h:53