e955c94ed3
Listing the "Blender Foundation" as copyright holder implied the Blender Foundation holds copyright to files which may include work from many developers. While keeping copyright on headers makes sense for isolated libraries, Blender's own code may be refactored or moved between files in a way that makes the per file copyright holders less meaningful. Copyright references to the "Blender Foundation" have been replaced with "Blender Authors", with the exception of `./extern/` since these this contains libraries which are more isolated, any changed to license headers there can be handled on a case-by-case basis. Some directories in `./intern/` have also been excluded: - `./intern/cycles/` it's own `AUTHORS` file is planned. - `./intern/opensubdiv/`. An "AUTHORS" file has been added, using the chromium projects authors file as a template. Design task: #110784 Ref !110783.
118 lines
2.9 KiB
C
118 lines
2.9 KiB
C
/* SPDX-FileCopyrightText: 2023 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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/** \file
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* \ingroup bli
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*
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* Primitive generic buffer library.
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*
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* - Automatically grow as needed.
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* (currently never shrinks).
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* - Can be passed between functions.
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* - Supports using stack memory by default,
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* falling back to heap as needed.
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*
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* Usage examples:
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* \code{.c}
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* BLI_buffer_declare_static(int, my_int_array, BLI_BUFFER_NOP, 32);
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*
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* BLI_buffer_append(my_int_array, int, 42);
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* BLI_assert(my_int_array.count == 1);
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* BLI_assert(BLI_buffer_at(my_int_array, int, 0) == 42);
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*
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* BLI_buffer_free(&my_int_array);
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* \endcode
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*
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* \note this more or less fills same purpose as #BLI_array,
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* but supports resizing the array outside of the function
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* it was declared in.
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*/
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#include <string.h>
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#include "MEM_guardedalloc.h"
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#include "BLI_buffer.h"
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#include "BLI_utildefines.h"
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#include "BLI_strict_flags.h"
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static void *buffer_alloc(BLI_Buffer *buffer, const size_t len)
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{
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return MEM_mallocN(buffer->elem_size * len, "BLI_Buffer.data");
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}
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static void *buffer_realloc(BLI_Buffer *buffer, const size_t len)
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{
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return MEM_reallocN_id(buffer->data, buffer->elem_size * len, "BLI_Buffer.data");
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}
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void BLI_buffer_resize(BLI_Buffer *buffer, const size_t new_count)
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{
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if (UNLIKELY(new_count > buffer->alloc_count)) {
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if (buffer->flag & BLI_BUFFER_USE_STATIC) {
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void *orig = buffer->data;
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buffer->data = buffer_alloc(buffer, new_count);
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memcpy(buffer->data, orig, buffer->elem_size * buffer->count);
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buffer->alloc_count = new_count;
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buffer->flag &= ~BLI_BUFFER_USE_STATIC;
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}
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else {
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if (buffer->alloc_count && (new_count < buffer->alloc_count * 2)) {
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buffer->alloc_count *= 2;
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}
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else {
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buffer->alloc_count = new_count;
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}
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buffer->data = buffer_realloc(buffer, buffer->alloc_count);
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}
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}
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buffer->count = new_count;
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}
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void BLI_buffer_reinit(BLI_Buffer *buffer, const size_t new_count)
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{
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if (UNLIKELY(new_count > buffer->alloc_count)) {
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if ((buffer->flag & BLI_BUFFER_USE_STATIC) == 0) {
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if (buffer->data) {
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MEM_freeN(buffer->data);
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}
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}
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if (buffer->alloc_count && (new_count < buffer->alloc_count * 2)) {
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buffer->alloc_count *= 2;
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}
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else {
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buffer->alloc_count = new_count;
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}
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buffer->flag &= ~BLI_BUFFER_USE_STATIC;
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buffer->data = buffer_alloc(buffer, buffer->alloc_count);
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}
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buffer->count = new_count;
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}
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void _bli_buffer_append_array(BLI_Buffer *buffer, void *new_data, size_t count)
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{
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size_t size = buffer->count;
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BLI_buffer_resize(buffer, size + count);
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uint8_t *bytes = (uint8_t *)buffer->data;
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memcpy(bytes + size * buffer->elem_size, new_data, count * buffer->elem_size);
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}
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void _bli_buffer_free(BLI_Buffer *buffer)
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{
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if ((buffer->flag & BLI_BUFFER_USE_STATIC) == 0) {
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if (buffer->data) {
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MEM_freeN(buffer->data);
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}
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}
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memset(buffer, 0, sizeof(*buffer));
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}
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