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/* ALSA Card Profile
*
* 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 PA_ARRAY_H
#define PA_ARRAY_H
#ifdef __cplusplus
extern "C" {
#endif
#include <errno.h>
#include <string.h>
typedef struct pa_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 */
} pa_array;
#define PW_ARRAY_INIT(extend) ((struct pa_array) { NULL, 0, 0, (extend) })
#define pa_array_get_len_s(a,s) ((a)->size / (s))
#define pa_array_get_unchecked_s(a,idx,s,t) (t*)((uint8_t*)(a)->data + (int)((idx)*(s)))
#define pa_array_check_index_s(a,idx,s) ((idx) < pa_array_get_len_s(a,s))
#define pa_array_get_len(a,t) pa_array_get_len_s(a,sizeof(t))
#define pa_array_get_unchecked(a,idx,t) pa_array_get_unchecked_s(a,idx,sizeof(t),t)
#define pa_array_check_index(a,idx,t) pa_array_check_index_s(a,idx,sizeof(t))
#define pa_array_first(a) ((a)->data)
#define pa_array_end(a) (void*)((uint8_t*)(a)->data + (int)(a)->size)
#define pa_array_check(a,p) ((void*)((uint8_t*)p + (int)sizeof(*p)) <= pa_array_end(a))
#define pa_array_for_each(pos, array) \
for (pos = (__typeof__(pos)) pa_array_first(array); \
pa_array_check(array, pos); \
(pos)++)
#define pa_array_consume(pos, array) \
while (pos = (__typeof__(pos)) pa_array_first(array) && \
pa_array_check(array, pos)
#define pa_array_remove(a,p) \
({ \
(a)->size -= sizeof(*(p)); \
memmove(p, ((uint8_t*)(p) + (int)sizeof(*(p))), \
(uint8_t*)pa_array_end(a) - (uint8_t*)(p)); \
})
static inline void pa_array_init(pa_array *arr, size_t extend)
{
arr->data = NULL;
arr->size = arr->alloc = 0;
arr->extend = extend;
}
static inline void pa_array_clear(pa_array *arr)
{
free(arr->data);
}
static inline void pa_array_reset(pa_array *arr)
{
arr->size = 0;
}
static inline int pa_array_ensure_size(pa_array *arr, size_t size)
{
size_t alloc, need;
alloc = arr->alloc;
need = arr->size + size;
if (alloc < need) {
void *data;
alloc = alloc > arr->extend ? alloc : arr->extend;
while (alloc < need)
alloc *= 2;
if ((data = realloc(arr->data, alloc)) == NULL)
return -errno;
arr->data = data;
arr->alloc = alloc;
}
return 0;
}
static inline void *pa_array_add(pa_array *arr, size_t size)
{
void *p;
if (pa_array_ensure_size(arr, size) < 0)
return NULL;
p = (void*)((uint8_t*)arr->data + (int)arr->size);
arr->size += size;
return p;
}
static inline void *pa_array_add_fixed(pa_array *arr, size_t size)
{
void *p;
if (arr->alloc < arr->size + size) {
errno = ENOSPC;
return NULL;
}
p = ((uint8_t*)arr->data + (int)arr->size);
arr->size += size;
return p;
}
#define pa_array_add_ptr(a,p) \
*((void**) pa_array_add(a, sizeof(void*))) = (p)
static inline int pa_array_add_data(pa_array *arr, const void *data, size_t size)
{
void *d;
if ((d = pa_array_add(arr, size)) == NULL)
return -1;
memcpy(d, data, size);
return size;
}
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* PA_ARRAY_H */
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