1 /* 2 * Copyright (c) 2014-2020 Pavel Kalvoda <me@pavelkalvoda.com> 3 * 4 * libcbor is free software; you can redistribute it and/or modify 5 * it under the terms of the MIT license. See LICENSE for details. 6 */ 7 8 #ifndef LIBCBOR_MEMORY_UTILS_H 9 #define LIBCBOR_MEMORY_UTILS_H 10 11 #include <stdbool.h> 12 #include <string.h> 13 14 /** Can a and b be multiplied without overflowing size_t? */ 15 bool _cbor_safe_to_multiply(size_t a, size_t b); 16 17 /** Overflow-proof contiguous array allocation 18 * 19 * @param item_size 20 * @param item_count 21 * @return Region of item_size * item_count bytes, or NULL if the total size 22 * overflows size_t or the underlying allocator failed 23 */ 24 void* _cbor_alloc_multiple(size_t item_size, size_t item_count); 25 26 /** Overflow-proof contiguous array reallocation 27 * 28 * This implements the OpenBSD `reallocarray` functionality. 29 * 30 * @param pointer 31 * @param item_size 32 * @param item_count 33 * @return Realloc'd of item_size * item_count bytes, or NULL if the total size 34 * overflows size_t or the underlying allocator failed 35 */ 36 void* _cbor_realloc_multiple(void* pointer, size_t item_size, 37 size_t item_count); 38 39 #endif // LIBCBOR_MEMORY_UTILS_H 40