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 <span> 17 18 #include "pw_checksum/crc16_ccitt.h" 19 #include "pw_kvs/checksum.h" 20 21 namespace pw::kvs { 22 23 class ChecksumCrc16 final : public ChecksumAlgorithm { 24 public: ChecksumCrc16()25 ChecksumCrc16() 26 : ChecksumAlgorithm(std::as_bytes(std::span<uint16_t>(&crc_, 1))) {} 27 Reset()28 void Reset() override { crc_ = checksum::Crc16Ccitt::kInitialValue; } 29 Update(std::span<const std::byte> data)30 void Update(std::span<const std::byte> data) override { 31 crc_ = checksum::Crc16Ccitt::Calculate(data, crc_); 32 } 33 34 private: 35 uint16_t crc_ = checksum::Crc16Ccitt::kInitialValue; 36 }; 37 38 } // namespace pw::kvs 39