1 /* 2 * Copyright (c) 2022-2023 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_FILEMGMT_BACKUP_B_FILE_H 17 #define OHOS_FILEMGMT_BACKUP_B_FILE_H 18 19 #include <memory> 20 #include <string> 21 22 #include "unique_fd.h" 23 #include "json/json.h" 24 25 namespace OHOS::FileManagement::Backup { 26 using namespace std; 27 class BFile { 28 public: 29 /** 30 * @brief 一次性读取文件全部内容 31 * 32 * @param fd 文件描述符 33 * @return std::unique_ptr<char[]> 文件全部内容，保证最后一个字节为'\0' 34 * @throw std::system_error IO异常 35 */ 36 static std::unique_ptr<char[]> ReadFile(const UniqueFd &fd); 37 38 /** 39 * @brief linux sendfile 二次封装 40 * @param outFd 参数是待写入内容的文件描述符 41 * @param inFd 参数是待读出内容的文件描述符 42 * @throw std::system_error IO异常 43 */ 44 static void SendFile(int outFd, int inFd); 45 46 /** 47 * @brief linux write 二次封装 48 * @param fd 参数是待写入内容的文件描述符 49 * @param str 待写入文件的字符串 50 * @throw std::system_error IO异常 51 */ 52 static void Write(const UniqueFd &fd, const string &str); 53 54 /** 55 * @brief copy file from old path to new path 56 * 57 * @param from old path 58 * @param to new path 59 * @return true copy succeess 60 * @return false some error occur 61 */ 62 static bool CopyFile(const string &from, const string &to); 63 64 private: 65 }; 66 } // namespace OHOS::FileManagement::Backup 67 68 #endif // OHOS_FILEMGMT_BACKUP_B_FILE_H