vkd3d/libs/vkd3d-common/memory.c

/*
 * Copyright 2016 Henri Verbeet for CodeWeavers
 * Copyright 2017 Józef Kucia for CodeWeavers
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

#include "vkd3d_memory.h"

bool vkd3d_array_reserve(void **elements, size_t *capacity, size_t element_count, size_t element_size)
{
    size_t new_capacity, max_capacity;
    void *new_elements;

    if (element_count <= *capacity)
        return true;

    max_capacity = ~(size_t)0 / element_size;
    if (max_capacity < element_count)
        return false;

    new_capacity = max(*capacity, 4);
    while (new_capacity < element_count && new_capacity <= max_capacity / 2)
        new_capacity *= 2;

    if (new_capacity < element_count)
        new_capacity = element_count;

    if (!(new_elements = vkd3d_realloc(*elements, new_capacity * element_size)))
        return false;

    *elements = new_elements;
    *capacity = new_capacity;

    return true;
}