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/* PipeWire
*
* Copyright © 2018 Wim Taymans
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#ifndef PIPEWIRE_ARRAY_H
#define PIPEWIRE_ARRAY_H
#ifdef __cplusplus
extern "C" {
#endif
#include <errno.h>
#include <spa/utils/defs.h>
/** \defgroup pw_array Array
*
* \brief An array object
*
* The array is a dynamically resizable data structure that can
* hold items of the same size.
*/
/**
* \addtogroup pw_array
* \{
*/
struct pw_array {
void *data; /**< pointer to array data */
size_t size; /**< length of array in bytes */
size_t alloc; /**< number of allocated memory in \a data */
size_t extend; /**< number of bytes to extend with */
};
#define PW_ARRAY_INIT(extend) (struct pw_array) { NULL, 0, 0, extend }
#define pw_array_get_len_s(a,s) ((a)->size / (s))
#define pw_array_get_unchecked_s(a,idx,s,t) SPA_PTROFF((a)->data,(idx)*(s),t)
#define pw_array_check_index_s(a,idx,s) ((idx) < pw_array_get_len_s(a,s))
/** Get the number of items of type \a t in array */
#define pw_array_get_len(a,t) pw_array_get_len_s(a,sizeof(t))
/** Get the item with index \a idx and type \a t from array */
#define pw_array_get_unchecked(a,idx,t) pw_array_get_unchecked_s(a,idx,sizeof(t),t)
/** Check if an item with index \a idx and type \a t exist in array */
#define pw_array_check_index(a,idx,t) pw_array_check_index_s(a,idx,sizeof(t))
#define pw_array_first(a) ((a)->data)
#define pw_array_end(a) SPA_PTROFF((a)->data, (a)->size, void)
#define pw_array_check(a,p) (SPA_PTROFF(p,sizeof(*p),void) <= pw_array_end(a))
#define pw_array_for_each(pos, array) \
for (pos = (__typeof__(pos)) pw_array_first(array); \
pw_array_check(array, pos); \
(pos)++)
#define pw_array_consume(pos, array) \
for (pos = (__typeof__(pos)) pw_array_first(array); \
pw_array_check(array, pos); \
pos = (__typeof__(pos)) pw_array_first(array))
#define pw_array_remove(a,p) \
({ \
(a)->size -= sizeof(*(p)); \
memmove(p, SPA_PTROFF((p), sizeof(*(p)), void), \
SPA_PTRDIFF(pw_array_end(a),(p))); \
})
/** Initialize the array with given extend */
static inline void pw_array_init(struct pw_array *arr, size_t extend)
{
arr->data = NULL;
arr->size = arr->alloc = 0;
arr->extend = extend;
}
/** Clear the array */
static inline void pw_array_clear(struct pw_array *arr)
{
free(arr->data);
pw_array_init(arr, arr->extend);
}
/** Reset the array */
static inline void pw_array_reset(struct pw_array *arr)
{
arr->size = 0;
}
/** Make sure \a size bytes can be added to the array */
static inline int pw_array_ensure_size(struct pw_array *arr, size_t size)
{
size_t alloc, need;
alloc = arr->alloc;
need = arr->size + size;
if (SPA_UNLIKELY(alloc < need)) {
void *data;
alloc = SPA_MAX(alloc, arr->extend);
spa_assert(alloc != 0); /* forgot pw_array_init */
while (alloc < need)
alloc *= 2;
if (SPA_UNLIKELY((data = realloc(arr->data, alloc)) == NULL))
return -errno;
arr->data = data;
arr->alloc = alloc;
}
return 0;
}
/** Add \a ref size bytes to \a arr. A pointer to memory that can
* hold at least \a size bytes is returned */
static inline void *pw_array_add(struct pw_array *arr, size_t size)
{
void *p;
if (pw_array_ensure_size(arr, size) < 0)
return NULL;
p = SPA_PTROFF(arr->data, arr->size, void);
arr->size += size;
return p;
}
/** Add \a ref size bytes to \a arr. When there is not enough memory to
* hold \a size bytes, NULL is returned */
static inline void *pw_array_add_fixed(struct pw_array *arr, size_t size)
{
void *p;
if (SPA_UNLIKELY(arr->alloc < arr->size + size)) {
errno = ENOSPC;
return NULL;
}
p = SPA_PTROFF(arr->data, arr->size, void);
arr->size += size;
return p;
}
/** Add a pointer to array */
#define pw_array_add_ptr(a,p) \
*((void**) pw_array_add(a, sizeof(void*))) = (p)
/**
* \}
*/
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* PIPEWIRE_ARRAY_H */
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