public static NODE CreateFromBytes(byte[] raw) { switch (GetTypeFromBytes(raw)) { case SectorType.DIR_NODE: return(DIR_NODE.CreateFromBytes(raw)); case SectorType.FILE_NODE: return(FILE_NODE.CreateFromBytes(raw)); } throw new Exception("Expected a DIR_NODE or FILE_NODE!"); }
private void LoadChildren() { // Ensure that the children cache is correctly put in memory (i.e. reflects what's on the disk) // Assume if the cache exsists, it is correct at the moment // So, we need to call CommitChildren() if (children == null) { // Create the cache itself children = new Dictionary <string, VirtualNode>(); // Read the list of children for this directory from disk // Instantiate a VirtualNode for each [child?] and add them to the children cache. // Read the data sector for this directory DATA_SECTOR dataSector = DATA_SECTOR.CreateFromBytes(drive.Disk.ReadSector(sector.FirstDataAt)); // Extract the list of children from the sata sector byte[] rawList = dataSector.DataBytes; // Foreach child in the list... for (int i = 0; i < ChildCount; i++) { // Getthe child's sector address int childSectorAt = BitConverter.ToInt32(rawList, i * 4); // Read its sector from disk // Check if it's a file or directory byte[] childNodeBytes = drive.Disk.ReadSector(childSectorAt); NODE childSector; if (SECTOR.GetTypeFromBytes(childNodeBytes) == SECTOR.SectorType.DIR_NODE) { childSector = DIR_NODE.CreateFromBytes(drive.Disk.ReadSector(childSectorAt)); } else if (SECTOR.GetTypeFromBytes(childNodeBytes) == SECTOR.SectorType.FILE_NODE) { childSector = FILE_NODE.CreateFromBytes(drive.Disk.ReadSector(childSectorAt)); } else { throw new Exception("Unexpected sector type whe reading directory's children!"); } // Construct a VirtualNode VirtualNode childNode = new VirtualNode(drive, childSectorAt, childSector, this); // Add the VirtualNode to the children cache children.Add(childNode.Name, childNode); } } }