118 lines
3.1 KiB
C
118 lines
3.1 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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#pragma once
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/** \file
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* \ingroup bli
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct BLI_Buffer {
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void *data;
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size_t elem_size;
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size_t count, alloc_count;
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int flag;
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} BLI_Buffer;
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enum {
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BLI_BUFFER_NOP = 0,
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BLI_BUFFER_USE_STATIC = (1 << 0),
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};
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#define BLI_buffer_declare_static(type_, name_, flag_, static_count_) \
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char name_##user; /* warn for free only */ \
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type_ name_##_static_[static_count_]; \
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BLI_Buffer name_ = { \
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(name_##_static_), sizeof(type_), 0, static_count_, BLI_BUFFER_USE_STATIC | (flag_)}
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/* Never use static. */
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#define BLI_buffer_declare(type_, name_, flag_) \
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bool name_##user; /* warn for free only */ \
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BLI_Buffer name_ = {NULL, sizeof(type_), 0, 0, (flag_)}
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#define BLI_buffer_at(buffer_, type_, index_) \
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((((type_ *)(buffer_) \
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->data)[((BLI_assert(sizeof(type_) == (buffer_)->elem_size)), \
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(BLI_assert((int)(index_) >= 0 && (size_t)(index_) < (buffer_)->count)), \
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index_)]))
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#define BLI_buffer_array(buffer_, type_) (&(BLI_buffer_at(buffer_, type_, 0)))
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#define BLI_buffer_resize_data(buffer_, type_, new_count_) \
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((BLI_buffer_resize(buffer_, new_count_), new_count_ ? BLI_buffer_array(buffer_, type_) : NULL))
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#define BLI_buffer_reinit_data(buffer_, type_, new_count_) \
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((BLI_buffer_reinit(buffer_, new_count_), new_count_ ? BLI_buffer_array(buffer_, type_) : NULL))
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#define BLI_buffer_append(buffer_, type_, val_) \
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((BLI_buffer_resize(buffer_, (buffer_)->count + 1), \
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(BLI_buffer_at(buffer_, type_, (buffer_)->count - 1) = val_)))
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#define BLI_buffer_clear(buffer_) \
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{ \
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(buffer_)->count = 0; \
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} \
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(void)0
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/**
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* \note Never decreases the amount of memory allocated.
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*/
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void BLI_buffer_resize(BLI_Buffer *buffer, size_t new_count);
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/**
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* Ensure size, throwing away old data, respecting #BLI_BUFFER_USE_CALLOC.
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*
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* Similar to #BLI_buffer_resize, but use when the existing data can be:
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* - Ignored (malloc'd).
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* - Cleared (when #BLI_BUFFER_USE_CALLOC is set).
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*/
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void BLI_buffer_reinit(BLI_Buffer *buffer, size_t new_count);
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/**
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* Append an array of elements.
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*
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* Callers use #BLI_buffer_append_array.
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*/
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void _bli_buffer_append_array(BLI_Buffer *buffer, void *data, size_t count);
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#define BLI_buffer_append_array(buffer_, type_, data_, count_) \
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{ \
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type_ *__tmp = (data_); \
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BLI_assert(sizeof(type_) == (buffer_)->elem_size); \
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_bli_buffer_append_array(buffer_, __tmp, count_); \
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} \
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(void)0
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/**
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* Does not free the buffer structure itself.
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*
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* Callers use #BLI_buffer_free.
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*/
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void _bli_buffer_free(BLI_Buffer *buffer);
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#define BLI_buffer_free(name_) \
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{ \
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_bli_buffer_free(name_); \
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(void)name_##user; /* ensure we free */ \
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} \
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(void)0
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/**
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* A buffer embedded in a struct. Using #memcpy is allowed until first resize.
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*/
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#define BLI_buffer_field_init(name_, type_) \
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{ \
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memset((void *)name_, 0, sizeof(*name_)); \
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*(size_t *)&((name_)->elem_size) = sizeof(type_); \
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} \
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(void)0
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#define BLI_buffer_field_free(name_) _bli_buffer_free(name_)
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#ifdef __cplusplus
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}
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#endif
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