c1bc70b711
A lot of files were missing copyright field in the header and
the Blender Foundation contributed to them in a sense of bug
fixing and general maintenance.
This change makes it explicit that those files are at least
partially copyrighted by the Blender Foundation.
Note that this does not make it so the Blender Foundation is
the only holder of the copyright in those files, and developers
who do not have a signed contract with the foundation still
hold the copyright as well.
Another aspect of this change is using SPDX format for the
header. We already used it for the license specification,
and now we state it for the copyright as well, following the
FAQ:
https://reuse.software/faq/
118 lines
2.9 KiB
C
118 lines
2.9 KiB
C
/* SPDX-FileCopyrightText: 2023 Blender Foundation
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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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