/// <summary>
/// Attempts to initialise a disk treating it as MBR formatted.
/// </summary>
/// <param name="aDiskDevice">The disk to initialise.</param>
/// <returns>True if a valid MBR was detected and the disk was successfully initialised. Otherwise, false.</returns>
private static bool InitAsMBR(DiskDevice aDiskDevice)
{
#if FSM_TRACE
BasicConsole.WriteLine("Attempting to read MBR...");
#endif
byte[] MBRData = new byte[512];
aDiskDevice.ReadBlock(0UL, 1U, MBRData);
#if FSM_TRACE
BasicConsole.WriteLine("Read potential MBR data. Attempting to init MBR...");
#endif
MBR TheMBR = new MBR(MBRData);
if (!TheMBR.IsValid)
{
return(false);
}
else
{
#if FSM_TRACE
BasicConsole.WriteLine("Valid MBR found.");
#endif
ProcessMBR(TheMBR, aDiskDevice);
return(true);
}
}
/// <summary>
/// Processes a valid master boot record to initialize its partitions.
/// </summary>
/// <param name="anMBR">The MBR to process.</param>
/// <param name="aDiskDevice">The disk device from which the MBR was read.</param>
private static void ProcessMBR(MBR anMBR, DiskDevice aDiskDevice)
{
for (int i = 0; i < anMBR.NumPartitions; i++)
{
MBR.PartitionInfo aPartInfo = anMBR.Partitions[i];
if (aPartInfo.EBRLocation != 0)
{
byte[] EBRData = new byte[512];
aDiskDevice.ReadBlock(aPartInfo.EBRLocation, 1U, EBRData);
EBR newEBR = new EBR(EBRData);
ProcessMBR(newEBR, aDiskDevice);
}
else
{
Partitions.Add(new Partition(aDiskDevice, aPartInfo.StartSector, aPartInfo.SectorCount));
}
}
}
/// <summary>
/// Reads contiguous blocks within the partition. Block 0 = 1st sector of the partition.
/// </summary>
/// <param name="aBlockNo">The first sector (block) number to read.</param>
/// <param name="aBlockCount">The number of sectors (blocks) to read.</param>
/// <param name="aData">The buffer to read into.</param>
public override void ReadBlock(UInt64 aBlockNo, UInt32 aBlockCount, byte[] aData)
{
UInt64 DiskBlockNo = StartingSector + aBlockNo;
TheDiskDevice.ReadBlock(DiskBlockNo, aBlockCount, aData);
}
