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/*
* Copyright (c) 2014-2020 Pavel Kalvoda <me@pavelkalvoda.com>
*
* libcbor is free software; you can redistribute it and/or modify
* it under the terms of the MIT license. See LICENSE for details.
*/
#ifndef LIBCBOR_MEMORY_UTILS_H
#define LIBCBOR_MEMORY_UTILS_H
#include <stdbool.h>
#include <string.h>
#include "cbor/common.h"
/** Can `a` and `b` be multiplied without overflowing size_t? */
_CBOR_NODISCARD
bool _cbor_safe_to_multiply(size_t a, size_t b);
/** Can `a` and `b` be added without overflowing size_t? */
_CBOR_NODISCARD
bool _cbor_safe_to_add(size_t a, size_t b);
/** Adds `a` and `b`, propagating zeros and returing 0 on overflow. */
_CBOR_NODISCARD
size_t _cbor_safe_signaling_add(size_t a, size_t b);
/** Overflow-proof contiguous array allocation
*
* @param item_size
* @param item_count
* @return Region of item_size * item_count bytes, or NULL if the total size
* overflows size_t or the underlying allocator failed
*/
void* _cbor_alloc_multiple(size_t item_size, size_t item_count);
/** Overflow-proof contiguous array reallocation
*
* This implements the OpenBSD `reallocarray` functionality.
*
* @param pointer
* @param item_size
* @param item_count
* @return Realloc'd of item_size * item_count bytes, or NULL if the total size
* overflows size_t or the underlying allocator failed
*/
void* _cbor_realloc_multiple(void* pointer, size_t item_size,
size_t item_count);
#endif // LIBCBOR_MEMORY_UTILS_H
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