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