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 Verify(span<const byte> checksum) const23Status ChecksumAlgorithm::Verify(span<const byte> checksum) const { 24 if (checksum.size() < size_bytes()) { 25 return Status::InvalidArgument(); 26 } 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 } 32 if (std::memcmp(state_.data(), checksum.data(), size_bytes()) != 0) { 33 return Status::DataLoss(); 34 } 35 return OkStatus(); 36 } 37 38 } // namespace pw::kvs 39