BLI_buffer.h

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/* SPDX-FileCopyrightText: 2023 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#pragma once

 
#include <stddef.h>
 
typedef struct BLI_Buffer {
  void *data;
  size_t elem_size;
  size_t count, alloc_count;
  int flag;
} BLI_Buffer;
 
enum {
  BLI_BUFFER_NOP = 0,
  BLI_BUFFER_USE_STATIC = (1 << 0),
};
 
#define BLI_buffer_declare_static(type_, name_, flag_, static_count_) \
  char name_##user; /* warn for free only */ \
  type_ name_##_static_[static_count_]; \
  BLI_Buffer name_ = { \
      (name_##_static_), sizeof(type_), 0, static_count_, BLI_BUFFER_USE_STATIC | (flag_)}
 
/* Never use static. */
#define BLI_buffer_declare(type_, name_, flag_) \
  bool name_##user; /* warn for free only */ \
  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)), \
                  (BLI_assert((int)(index_) >= 0 && (size_t)(index_) < (buffer_)->count)), \
                  index_)]))
 
#define BLI_buffer_array(buffer_, type_) (&(BLI_buffer_at(buffer_, type_, 0)))
 
#define BLI_buffer_resize_data(buffer_, type_, new_count_) \
  ((BLI_buffer_resize(buffer_, new_count_), new_count_ ? BLI_buffer_array(buffer_, type_) : NULL))
 
#define BLI_buffer_reinit_data(buffer_, type_, new_count_) \
  ((BLI_buffer_reinit(buffer_, new_count_), new_count_ ? BLI_buffer_array(buffer_, type_) : NULL))
 
#define BLI_buffer_append(buffer_, type_, val_) \
  ((BLI_buffer_resize(buffer_, (buffer_)->count + 1), \
    (BLI_buffer_at(buffer_, type_, (buffer_)->count - 1) = val_)))
 
#define BLI_buffer_clear(buffer_) \
  { \
    (buffer_)->count = 0; \
  } \
  (void)0

void BLI_buffer_resize(BLI_Buffer *buffer, size_t new_count);

void BLI_buffer_reinit(BLI_Buffer *buffer, size_t new_count);

void _bli_buffer_append_array(BLI_Buffer *buffer, void *new_data, size_t count);
#define BLI_buffer_append_array(buffer_, type_, data_, count_) \
  { \
    type_ *__tmp = (data_); \
    BLI_assert(sizeof(type_) == (buffer_)->elem_size); \
    _bli_buffer_append_array(buffer_, __tmp, count_); \
  } \
  (void)0

void _bli_buffer_free(BLI_Buffer *buffer);
#define BLI_buffer_free(name_) \
  { \
    _bli_buffer_free(name_); \
    (void)name_##user; /* ensure we free */ \
  } \
  (void)0

#define BLI_buffer_field_init(name_, type_) \
  { \
    memset((void *)name_, 0, sizeof(*name_)); \
    *(size_t *)&((name_)->elem_size) = sizeof(type_); \
  } \
  (void)0
 
#define BLI_buffer_field_free(name_) _bli_buffer_free(name_)