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 #pragma once 15 16 #include "pw_checksum/crc16_ccitt.h" 17 #include "pw_kvs/checksum.h" 18 #include "pw_span/span.h" 19 20 namespace pw::kvs { 21 22 class ChecksumCrc16 final : public ChecksumAlgorithm { 23 public: ChecksumCrc16()24 ChecksumCrc16() : ChecksumAlgorithm(as_bytes(span<uint16_t>(&crc_, 1))) {} 25 Reset()26 void Reset() override { crc_ = checksum::Crc16Ccitt::kInitialValue; } 27 Update(span<const std::byte> data)28 void Update(span<const std::byte> data) override { 29 crc_ = checksum::Crc16Ccitt::Calculate(data, crc_); 30 } 31 32 private: 33 uint16_t crc_ = checksum::Crc16Ccitt::kInitialValue; 34 }; 35 36 } // namespace pw::kvs 37