1 /*
2  * Copyright (c) 2024 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 
16 #ifndef OHOS_IDL_STRINGPOOL_H
17 #define OHOS_IDL_STRINGPOOL_H
18 
19 #include <unordered_map>
20 #include <string>
21 #include <cstddef>
22 #include "util/string_helper.h"
23 
24 namespace OHOS {
25 namespace Idl {
26 class StringPool {
27 public:
28     StringPool();
29 
30     ~StringPool();
31 
32     void Add(const std::string& string);
33 
34     ptrdiff_t GetOffset(const std::string& string);
35 
GetSize()36     size_t GetSize()
37     {
38         return dataOffset_;
39     }
40 
GetData()41     uint8_t* GetData()
42     {
43         return data_;
44     }
45 
46 private:
47     ptrdiff_t AddInternal(const std::string& string);
48 
49     bool Grow(size_t expand);
50 
51     static const char* TAG;
52     uint8_t* data_ = nullptr;
53     size_t dataCapacity_ = 256;
54     ptrdiff_t dataOffset_ = 0;
55     std::unordered_map<std::string, ptrdiff_t, StringHashFunc, StringEqualFunc> stringOffsets_;
56 };
57 }
58 }
59 #endif // OHOS_IDL_STRINGPOOL_H
60