1 /*
2  * Copyright (c) 2021 Huawei Device Co., Ltd.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at
6  *
7  *     http://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,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 #ifndef DATA_COMPRESSION_H
16 #define DATA_COMPRESSION_H
17 
18 #include <vector>
19 #include <set>
20 #include <map>
21 
22 #include "types_export.h"
23 
24 namespace DistributedDB {
25 class DataCompression {
26 public:
27     static DataCompression *GetInstance(CompressAlgorithm algo);
28     static void GetCompressionAlgo(std::set<CompressAlgorithm> &algorithmSet);
29     static int TransferCompressionAlgo(uint32_t compressAlgoType, CompressAlgorithm &algoType);
30 
31     virtual int Compress(const std::vector<uint8_t> &srcData, std::vector<uint8_t> &destData) const = 0;
32     virtual int Uncompress(const std::vector<uint8_t> &srcData, std::vector<uint8_t> &destData, uint32_t destLen)
33         const = 0;
34 
35 protected:
36     DataCompression() = default;
37     virtual ~DataCompression() = default;
38     DataCompression(const DataCompression& compression) = delete;
39     DataCompression& operator= (const DataCompression& compression) = delete;
40 
41     static void Register(CompressAlgorithm algo, DataCompression *compression);
42 
43 private:
44     static std::map<CompressAlgorithm, DataCompression *> &GetCompressionAlgos();
45     static std::map<uint32_t, CompressAlgorithm> &GetTransMap();
46 };
47 }  // namespace DistributedDB
48 #endif  // DATA_COMPRESSION_H