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);
}
}
}