public static uint GetDeviceReadTransferLength(byte[] commandBytes, PeripheralDeviceType deviceType, uint blockSize)
{
if (deviceType == PeripheralDeviceType.DirectAccessBlockDevice ||
deviceType == PeripheralDeviceType.CDRomDevice)
{
return(GetBlockDeviceReadTransferLength(commandBytes, blockSize));
}
else if (deviceType == PeripheralDeviceType.SequentialAccessDevice)
{
return(SCSICommandParser.GetSequentialAccessDeviceReadTransferLength(commandBytes, blockSize));
}
throw new NotSupportedException("Device Type Not Supported!");
}
private SCSI_PASS_THROUGH_DIRECT_WITH_BUFFER BuildSCSIPassThroughStructure(byte[] commandBytes, LogicalUnit logicalUnit, byte[] data)
{
SCSI_PASS_THROUGH_DIRECT_WITH_BUFFER scsi = null;
scsi = new SCSI_PASS_THROUGH_DIRECT_WITH_BUFFER();
scsi.Spt.Length = (ushort)Marshal.SizeOf(scsi.Spt);
scsi.Spt.PathId = logicalUnit.PathId;
scsi.Spt.TargetId = logicalUnit.TargetId;
scsi.Spt.Lun = logicalUnit.TargetLun;
scsi.Spt.CdbLength = (byte)commandBytes.Length;
scsi.Spt.Cdb = commandBytes;
if (data != null && data.Length > 0)
{
// DATA OUT (from initiator to target, WRITE)
scsi.Spt.DataIn = (byte)SCSIDataDirection.Out;
scsi.Spt.DataTransferLength = (uint)data.Length;
scsi.Spt.DataBuffer = Marshal.AllocHGlobal((int)scsi.Spt.DataTransferLength);
Marshal.Copy(data, 0, scsi.Spt.DataBuffer, data.Length);
}
else
{
// DATA IN (to initiator from target, READ)
scsi.Spt.DataIn = (byte)SCSICommandParser.GetDataDirection(commandBytes);
if ((SCSIDataDirection)scsi.Spt.DataIn == SCSIDataDirection.In)
{
scsi.Spt.DataTransferLength = GetDataInTransferLength(commandBytes, logicalUnit);
scsi.Spt.DataBuffer = Marshal.AllocHGlobal((int)scsi.Spt.DataTransferLength);
}
else
{
scsi.Spt.DataTransferLength = 0; // No data!
scsi.Spt.DataBuffer = IntPtr.Zero;
}
}
Log(Severity.Verbose, "SCSI Command: {0}, Data Length: {1}, Transfer Direction: {2}, Transfer Length: {3}, LUN: {4}", (SCSIOpCodeName)commandBytes[0], data.Length, (SCSIDataDirection)scsi.Spt.DataIn, scsi.Spt.DataTransferLength, logicalUnit.AssociatedLun);
scsi.Spt.TimeOutValue = SCSI_TIMEOUT;
scsi.Spt.SenseInfoOffset = (uint)Marshal.OffsetOf(typeof(SCSI_PASS_THROUGH_DIRECT_WITH_BUFFER), "Sense");
scsi.Spt.SenseInfoLength = (byte)scsi.Sense.Length;
return(scsi);
}
private uint GetDataInTransferLength(byte[] commandBytes, LogicalUnit logicalUnit)
{
switch ((SCSIOpCodeName)commandBytes[0])
{
case SCSIOpCodeName.Read16: // DATA_IN (12-14)
case SCSIOpCodeName.ReadReverse16: // DATA_IN (12-14)
case SCSIOpCodeName.Read6: // DATA_IN (2-4)
case SCSIOpCodeName.ReadReverse6: // DATA_IN (2-4)
case SCSIOpCodeName.Read10: // DATA_IN (7-8)
case SCSIOpCodeName.Read12: // DATA_IN (6-9)
{
if (logicalUnit.BlockSize == null)
{
throw new NotSupportedException("Command Sequence Not Supported!");
}
return(SCSICommandParser.GetDeviceReadTransferLength(commandBytes, logicalUnit.DeviceType, logicalUnit.BlockSize.Value));
}
default:
return(SCSICommandParser.GetCDBTransferLength(commandBytes, logicalUnit.DeviceType));
}
}
