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/* SPDX-License-Identifier: GPL-2.0-or-later */
/** \file
* \ingroup bli
*
* Primitive generic buffer library.
*
* - Automatically grow as needed.
* (currently never shrinks).
* - Can be passed between functions.
* - Supports using stack memory by default,
* falling back to heap as needed.
*
* Usage examples:
* \code{.c}
* BLI_buffer_declare_static(int, my_int_array, BLI_BUFFER_NOP, 32);
*
* BLI_buffer_append(my_int_array, int, 42);
* BLI_assert(my_int_array.count == 1);
* BLI_assert(BLI_buffer_at(my_int_array, int, 0) == 42);
*
* BLI_buffer_free(&my_int_array);
* \endcode
*
* \note this more or less fills same purpose as #BLI_array,
* but supports resizing the array outside of the function
* it was declared in.
*/
#include <string.h>
#include "MEM_guardedalloc.h"
#include "BLI_buffer.h"
#include "BLI_utildefines.h"
#include "BLI_strict_flags.h"
static void *buffer_alloc(BLI_Buffer *buffer, const size_t len)
{
return MEM_mallocN(buffer->elem_size * len, "BLI_Buffer.data");
}
static void *buffer_realloc(BLI_Buffer *buffer, const size_t len)
{
return MEM_reallocN_id(buffer->data, buffer->elem_size * len, "BLI_Buffer.data");
}
void BLI_buffer_resize(BLI_Buffer *buffer, const size_t new_count)
{
if (UNLIKELY(new_count > buffer->alloc_count)) {
if (buffer->flag & BLI_BUFFER_USE_STATIC) {
void *orig = buffer->data;
buffer->data = buffer_alloc(buffer, new_count);
memcpy(buffer->data, orig, buffer->elem_size * buffer->count);
buffer->alloc_count = new_count;
buffer->flag &= ~BLI_BUFFER_USE_STATIC;
}
else {
if (buffer->alloc_count && (new_count < buffer->alloc_count * 2)) {
buffer->alloc_count *= 2;
}
else {
buffer->alloc_count = new_count;
}
buffer->data = buffer_realloc(buffer, buffer->alloc_count);
}
}
buffer->count = new_count;
}
void BLI_buffer_reinit(BLI_Buffer *buffer, const size_t new_count)
{
if (UNLIKELY(new_count > buffer->alloc_count)) {
if ((buffer->flag & BLI_BUFFER_USE_STATIC) == 0) {
if (buffer->data) {
MEM_freeN(buffer->data);
}
}
if (buffer->alloc_count && (new_count < buffer->alloc_count * 2)) {
buffer->alloc_count *= 2;
}
else {
buffer->alloc_count = new_count;
}
buffer->flag &= ~BLI_BUFFER_USE_STATIC;
buffer->data = buffer_alloc(buffer, buffer->alloc_count);
}
buffer->count = new_count;
}
void _bli_buffer_append_array(BLI_Buffer *buffer, void *new_data, size_t count)
{
size_t size = buffer->count;
BLI_buffer_resize(buffer, size + count);
uint8_t *bytes = (uint8_t *)buffer->data;
memcpy(bytes + size * buffer->elem_size, new_data, count * buffer->elem_size);
}
void _bli_buffer_free(BLI_Buffer *buffer)
{
if ((buffer->flag & BLI_BUFFER_USE_STATIC) == 0) {
if (buffer->data) {
MEM_freeN(buffer->data);
}
}
memset(buffer, 0, sizeof(*buffer));
}
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