public void Format(DiskDriver disk)
{
//wipe the disk
FREE_SECTOR freeSector = new FREE_SECTOR(disk.BytesPerSector);
for (int i = 0; i < disk.SectorCount; i++)
{
disk.WriteSector(i, freeSector.RawBytes);
}
//format it
DRIVE_INFO driveInfo = new DRIVE_INFO(disk.BytesPerSector, Constants.ROOT_DIR_SECTOR);
disk.WriteSector(Constants.DRIVE_INFO_SECTOR, driveInfo.RawBytes);
DIR_NODE rootNode = new DIR_NODE(disk.BytesPerSector, Constants.ROOT_DATA_SECTOR, "/", 0);
disk.WriteSector(Constants.ROOT_DIR_SECTOR, rootNode.RawBytes);
DATA_SECTOR rootData = new DATA_SECTOR(disk.BytesPerSector, 0, new byte[1]);
disk.WriteSector(Constants.ROOT_DATA_SECTOR, rootData.RawBytes);
}
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);
}
private VirtualNode CommonMake(string name, bool makeFile = true)
{
if (mSector.Type != SECTOR.SectorType.DIR_NODE)
{
throw new Exception($"Cannot create Dir/File under node type " + mSector.Type.ToString());
}
LoadChildren();
if (mChildren.ContainsKey(name))
{
throw new Exception("Name already in use!");
}
int[] nextFreeSectors = mDrive.GetNextFreeSectors(2);
int nodeAddr = nextFreeSectors[0];
int dataAddr = nextFreeSectors[1];
NODE newNode = null;
if (makeFile)
{
newNode = new FILE_NODE(mDrive.Disk.BytesPerSector, dataAddr, name, 0);
}
else
{
newNode = new DIR_NODE(mDrive.Disk.BytesPerSector, dataAddr, name, 0);
}
DATA_SECTOR dirdata = new DATA_SECTOR(mDrive.Disk.BytesPerSector, 0, null);
mDrive.Disk.WriteSector(nodeAddr, newNode.RawBytes);
mDrive.Disk.WriteSector(dataAddr, dirdata.RawBytes);
VirtualNode child = new VirtualNode(mDrive, nodeAddr, newNode, this);
mChildren[name] = child;
CommitChildren();
return(child);
}
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;
}
}