static void TestPhysicalFileSystem() { SlowDisk disk = new SlowDisk(1); disk.TurnOn(); int SECTOR_SIZE = disk.BytesPerSector; //free sector { FREE_SECTOR freeWrite = new FREE_SECTOR(disk.BytesPerSector); disk.WriteSector(0, freeWrite.RawBytes); FREE_SECTOR freeRead = FREE_SECTOR.CreateFromBytes(disk.ReadSector(0)); CheckSectorBytes(freeWrite, freeRead); } //drive info { DRIVE_INFO driveWrite = new DRIVE_INFO(disk.BytesPerSector, 101); disk.WriteSector(1, driveWrite.RawBytes); DRIVE_INFO driveRead = DRIVE_INFO.CreateFromBytes(disk.ReadSector(1)); CheckSectorBytes(driveWrite, driveRead); } //dir node { DIR_NODE dirWrite = new DIR_NODE(disk.BytesPerSector, 103, "dir1", 10); disk.WriteSector(2, dirWrite.RawBytes); DIR_NODE dirRead = DIR_NODE.CreateFromBytes(disk.ReadSector(2)); CheckSectorBytes(dirWrite, dirRead); } //file node { FILE_NODE fileWrite = new FILE_NODE(disk.BytesPerSector, 104, "file1", 100); disk.WriteSector(3, fileWrite.RawBytes); FILE_NODE fileRead = FILE_NODE.CreateFromBytes(disk.ReadSector(3)); CheckSectorBytes(fileWrite, fileRead); } //data sector { byte[] testData = new byte[DATA_SECTOR.MaxDataLength(disk.BytesPerSector)]; for (int i = 0; i < testData.Length; i++) { testData[i] = (byte)(i + 1); } DATA_SECTOR dataWrite = new DATA_SECTOR(disk.BytesPerSector, 105, testData); disk.WriteSector(4, dataWrite.RawBytes); DATA_SECTOR dataRead = DATA_SECTOR.CreateFromBytes(disk.ReadSector(4)); CheckSectorBytes(dataWrite, dataRead); } disk.TurnOff(); }
public static NODE CreateFromBytes(byte[] raw) { SectorType type = GetTypeFromBytes(raw); NODE result = null; if (type == SectorType.DIR_NODE) { result = DIR_NODE.CreateFromBytes(raw); } else if (type == SectorType.FILE_NODE) { result = FILE_NODE.CreateFromBytes(raw); } else { throw new Exception("Expected a DIR_NODE or FILE_NODE!"); } return(result); }
public void Mount(DiskDriver disk, string mountPoint) { if (mDrives.Count == 0 && mountPoint.Length != 1 && mountPoint[0] != '/') { throw new Exception("First disk must be mounted at the root"); } //add virtual drive DRIVE_INFO driveInfo = DRIVE_INFO.CreateFromBytes(disk.ReadSector(Constants.DRIVE_INFO_SECTOR)); VirtualDrive newDrive = new VirtualDrive(disk, Constants.DRIVE_INFO_SECTOR, driveInfo); mDrives.Add(mountPoint, newDrive); //add root dir, make node, add it int rootNodeAt = driveInfo.RootNodeAt; DIR_NODE newDriveRootDir = DIR_NODE.CreateFromBytes(disk.ReadSector(rootNodeAt)); VirtualNode virtualNode = new VirtualNode(newDrive, rootNodeAt, newDriveRootDir, null); if (mDrives.Count == 1) { mRootNode = virtualNode; } }