1 /* 2 * Copyright (c) 2023-2024 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 HIVIEW_BASE_EVENT_STORE_UTILITY_SYS_EVENT_DOC_READER_H 17 #define HIVIEW_BASE_EVENT_STORE_UTILITY_SYS_EVENT_DOC_READER_H 18 19 #include <fstream> 20 #include <functional> 21 #include <string> 22 23 #include "content_reader_factory.h" 24 #include "event_doc_reader.h" 25 26 namespace OHOS { 27 namespace HiviewDFX { 28 namespace EventStore { 29 using ReadCallback = std::function<bool(uint8_t* content, uint32_t& contentSize)>; 30 class SysEventDocReader : public EventDocReader { 31 public: 32 SysEventDocReader(const std::string& path); 33 ~SysEventDocReader(); 34 int Read(const DocQuery& query, EntryQueue& entries, int& num) override; 35 int ReadFileSize(); 36 int ReadPageSize(uint32_t& pageSize); 37 int ReadHeader(DocHeader& header); 38 int ReadHeader(DocHeader& header, HeadExtraInfo& headExtra); 39 int64_t ReadMaxEventSequence(); 40 41 private: 42 void Init(const std::string& path); 43 void InitEventInfo(const std::string& path); 44 int Read(ReadCallback callback); 45 int ReadContent(uint8_t** content, uint32_t& contentSize, uint32_t pageIndex); 46 int ReadPages(ReadCallback callback); 47 bool HasReadFileEnd(); 48 bool HasReadPageEnd(uint32_t pageIndex); 49 bool IsValidHeader(const DocHeader& header); 50 bool CheckEventInfo(uint8_t* content); 51 int SeekgPage(uint32_t pageIndex); 52 std::shared_ptr<RawData> BuildRawData(uint8_t* content, uint32_t contentSize); 53 void TryToAddEntry(uint8_t* content, uint32_t contentSize, const DocQuery& query, 54 EntryQueue& entries, int& num); 55 56 private: 57 std::ifstream in_; 58 int fileSize_ = 0; 59 uint32_t pageSize_ = 0; 60 uint8_t dataFmtVersion_ = 0; 61 uint64_t docHeaderSize_ = 0; 62 HeadExtraInfo headExtra_; 63 EventInfo info_; 64 }; // EventDocWriter 65 } // EventStore 66 } // HiviewDFX 67 } // OHOS 68 #endif // HIVIEW_BASE_EVENT_STORE_UTILITY_SYS_EVENT_DOC_READER_H 69