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/*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* ***** END GPL LICENSE BLOCK *****
*/
#ifndef __BLI_BUFFER_H__
#define __BLI_BUFFER_H__
/* Note: this more or less fills same purpose as BLI_array, but makes
* it much easier to resize the array outside of the function it was
* declared in since */
/* Usage examples:
*
* {
* BLI_buffer_declare_static(int, my_int_array, BLI_BUFFER_NOP, 32);
*
* BLI_buffer_append(my_int_array, int, 42);
* assert(my_int_array.count == 1);
* assert(BLI_buffer_at(my_int_array, int, 0) == 42);
*
* BLI_buffer_free(&my_int_array);
* }
*/
typedef struct {
void *data;
const int elem_size;
int count, alloc_count;
int flag;
} BLI_Buffer;
enum {
BLI_BUFFER_NOP = 0,
BLI_BUFFER_USE_STATIC = (1 << 0),
BLI_BUFFER_USE_CALLOC = (1 << 1), /* ensure the array is always calloc'd */
};
#define BLI_buffer_declare_static(type_, name_, flag_, static_count_) \
type_ *name_ ## _static_[static_count_]; \
BLI_Buffer name_ = { \
/* clear the static memory if this is a calloc'd array */ \
((void)((flag_ & BLI_BUFFER_USE_CALLOC) ? \
memset(name_ ## _static_, 0, sizeof(name_ ## _static_)) : 0\
), /* memset-end */ \
name_ ## _static_), \
sizeof(type_), \
0, \
static_count_, \
BLI_BUFFER_USE_STATIC | flag_}
/* never use static*/
#define BLI_buffer_declare(type_, name_, flag_) \
BLI_Buffer name_ = {NULL, \
sizeof(type_), \
0, \
0, \
flag_}
#define BLI_buffer_at(buffer_, type_, index_) ( \
(((type_ *)(buffer_)->data)[(BLI_assert(sizeof(type_) == (buffer_)->elem_size)), index_]))
#define BLI_buffer_append(buffer_, type_, val_) ( \
BLI_buffer_resize(buffer_, (buffer_)->count + 1), \
(BLI_buffer_at(buffer_, type_, (buffer_)->count - 1) = val_) \
)
/* Never decreases the amount of memory allocated */
void BLI_buffer_resize(BLI_Buffer *buffer, int new_count);
/* Does not free the buffer structure itself */
void BLI_buffer_free(BLI_Buffer *buffer);
#endif /* __BLI_BUFFER_H__ */
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