1#ifndef AWS_COMMON_PRIVATE_BYTE_BUF_H
2#define AWS_COMMON_PRIVATE_BYTE_BUF_H
3/*
4 * Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
5 *
6 * Licensed under the Apache License, Version 2.0 (the "License").
7 * You may not use this file except in compliance with the License.
8 * A copy of the License is located at
9 *
10 * http://aws.amazon.com/apache2.0
11 *
12 * or in the "license" file accompanying this file. This file is distributed
13 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
14 * express or implied. See the License for the specific language governing
15 * permissions and limitations under the License.
16 */
17
18#include <aws/common/byte_buf.h>
19
20/**
21 * If index >= bound, bound > (SIZE_MAX / 2), or index > (SIZE_MAX / 2), returns
22 * 0. Otherwise, returns UINTPTR_MAX. This function is designed to return the correct
23 * value even under CPU speculation conditions, and is intended to be used for
24 * SPECTRE mitigation purposes.
25 */
26AWS_COMMON_API size_t aws_nospec_mask(size_t index, size_t bound);
27
28#endif /* AWS_COMMON_PRIVATE_BYTE_BUF_H */
29