Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 1 | // Copyright 2020 The Pigweed Authors |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| 4 | // use this file except in compliance with the License. You may obtain a copy of |
| 5 | // the License at |
| 6 | // |
| 7 | // https://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| 11 | // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| 12 | // License for the specific language governing permissions and limitations under |
| 13 | // the License. |
| 14 | |
| 15 | #include "pw_kvs/checksum.h" |
| 16 | |
| 17 | #include <cstring> |
| 18 | |
| 19 | namespace pw::kvs { |
| 20 | |
| 21 | using std::byte; |
| 22 | |
Wyatt Hepler | e2cbadf | 2020-06-22 11:21:45 -0700 | [diff] [blame] | 23 | Status ChecksumAlgorithm::Verify(std::span<const byte> checksum) const { |
Wyatt Hepler | 6e3a83b | 2020-02-04 07:36:45 -0800 | [diff] [blame] | 24 | if (checksum.size() < size_bytes()) { |
Wyatt Hepler | d78f7c6 | 2020-09-28 14:27:32 -0700 | [diff] [blame] | 25 | return Status::InvalidArgument(); |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 26 | } |
Ted Pudlik | 071befe | 2021-11-15 23:59:04 +0000 | [diff] [blame] | 27 | if (state_.empty()) { |
| 28 | // Special case: state_.data is a nullptr, so calling std::memcmp would be |
| 29 | // undefined behavior. |
| 30 | return OkStatus(); |
| 31 | } |
Wyatt Hepler | 6e3a83b | 2020-02-04 07:36:45 -0800 | [diff] [blame] | 32 | if (std::memcmp(state_.data(), checksum.data(), size_bytes()) != 0) { |
Wyatt Hepler | d78f7c6 | 2020-09-28 14:27:32 -0700 | [diff] [blame] | 33 | return Status::DataLoss(); |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 34 | } |
Wyatt Hepler | 1b3da3a | 2021-01-07 13:26:57 -0800 | [diff] [blame] | 35 | return OkStatus(); |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 36 | } |
| 37 | |
| 38 | } // namespace pw::kvs |