創建
/*** @brief 創建文件:在密碼設備內部創建用于存儲用戶數據的文件* @param pucFileName 緩沖區指針，用于存放輸入的文件名，最大長度128字節* @param uiNameLen 文件名長度* @param uiFileSize 文件所占存儲空間的長度*/void CreateFile(sdf_uint8_t *pucFileName, sdf_uint32_t uiNameLen,sdf_uint32_t uiFileSize) override {std::string file_name{reinterpret_cast<const char *>(pucFileName),uiNameLen};file_name = mgmt::get_md5_digest(file_name);int fd = open(file_name.c_str(),O_RDWR | O_CREAT );// TODO: error code, open errorif (fd == -1){ERR_EXIT("open error");}int ret = lseek(fd,uiFileSize,SEEK_CUR);// TODO: error code, leek errorif (ret == -1){ERR_EXIT("leek error");}close(fd);}
讀入
/*** @brief 讀取文件:讀取密碼設備內部存儲的用戶數據文件的內容* @param pucFileName 緩沖區指針，用于存放輸入的文件名，最大長度128字節* @param uiNameLen 文件名長度* @param uiOffset 指定讀取文件時的偏移值* @param puiReadLength 入參時指定讀取文件內容的長度；出參時返回實際讀取文件內容的長度* @param pucBuffer 緩沖區指針，用于存放讀取的文件數據*/void ReadFile(sdf_uint8_t *pucFileName, sdf_uint32_t uiNameLen,sdf_uint32_t uiOffset, sdf_uint32_t *puiReadLength,sdf_uint8_t *pucBuffer) override {std::string file_name = reinterpret_cast<const char *>(pucFileName,uiNameLen);std::ifstream file(file_name.c_str(),std::istream::binary);file.seekg(uiOffset,std::ios::beg);file.read(reinterpret_cast<char *>(pucBuffer),reinterpret_cast<long>(puiReadLength));if (file)std::cout << "all characters read successfully.";else{std::cout << "error: only " << file.gcount() << " could be read";puiReadLength = reinterpret_cast<sdf_uint32_t *>(file.gcount());}file.close();}
寫入
/*** @brief 寫入文件：向密碼設備內部存儲用戶數據的文件中寫入內容* @param pucFileName 緩沖區指針，用于存放輸入的文件名，最大長度128字節* @param uiNameLen 文件名長度* @param uiOffset 指定寫入文件時的偏移值* @param uiWriteLength 指定寫入文件內容的長度* @param pucBuffer 緩沖區指針，用于存放輸入的寫文件數據*/void WriteFile(sdf_uint8_t *pucFileName, sdf_uint32_t uiNameLen,sdf_uint32_t uiOffset, sdf_uint32_t uiWriteLength,sdf_uint8_t *pucBuffer) override {std::string file_name = reinterpret_cast<const char *>(pucFileName,uiNameLen);std::ofstream file(file_name.c_str(),std::istream::binary);file.seekp(uiOffset,std::ios::beg);file.write(reinterpret_cast<const char *>(pucBuffer),uiWriteLength);file.close();}
刪除
/*** @brief 刪除文件：刪除指定文件名的密碼設備內部存儲用戶數據的文件* @param pucFileName 緩沖區指針，用于存放輸入的文件名，最大長度128字節* @param uiNameLen 文件名長度*/void DeleteFile(sdf_uint8_t *pucFileName, sdf_uint32_t uiNameLen) override {std::string file_name{reinterpret_cast<const char *>(pucFileName),uiNameLen};file_name = mgmt::get_md5_digest(file_name);remove(file_name.c_str());}
參考鏈接
- istream::read
- ostream::write
- c++ fstream中seekg()和seekp()的用法 指定文件讀取偏移值
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