public byte[] GetBytes(ScsiCommand cmd, byte[] immediateData, int offset, int count, bool isFinalData, bool willRead, bool willWrite, uint expected)
{
BasicHeaderSegment _basicHeader = new BasicHeaderSegment();
_basicHeader.Immediate = cmd.ImmediateDelivery;
_basicHeader.OpCode = OpCode.ScsiCommand;
_basicHeader.FinalPdu = isFinalData;
_basicHeader.TotalAhsLength = 0;
_basicHeader.DataSegmentLength = count;
_basicHeader.InitiatorTaskTag = _connection.Session.CurrentTaskTag;
byte[] buffer = new byte[48 + Utilities.RoundUp(count, 4)];
_basicHeader.WriteTo(buffer, 0);
buffer[1] = PackAttrByte(isFinalData, willRead, willWrite, cmd.TaskAttributes);
Utilities.WriteBytesBigEndian(_lun, buffer, 8);
Utilities.WriteBytesBigEndian(expected, buffer, 20);
Utilities.WriteBytesBigEndian(_connection.Session.CommandSequenceNumber, buffer, 24);
Utilities.WriteBytesBigEndian(_connection.ExpectedStatusSequenceNumber, buffer, 28);
cmd.WriteTo(buffer, 32);
if (immediateData != null && count != 0)
{
Array.Copy(immediateData, offset, buffer, 48, count);
}
return buffer;
}
public byte[] GetBytes(ScsiCommand cmd, byte[] immediateData, int offset, int count, bool isFinalData, bool willRead, bool willWrite, uint expected)
{
BasicHeaderSegment _basicHeader = new BasicHeaderSegment();
_basicHeader.Immediate = cmd.ImmediateDelivery;
_basicHeader.OpCode = OpCode.ScsiCommand;
_basicHeader.FinalPdu = isFinalData;
_basicHeader.TotalAhsLength = 0;
_basicHeader.DataSegmentLength = count;
_basicHeader.InitiatorTaskTag = _connection.Session.CurrentTaskTag;
byte[] buffer = new byte[48 + Utilities.RoundUp(count, 4)];
_basicHeader.WriteTo(buffer, 0);
buffer[1] = PackAttrByte(isFinalData, willRead, willWrite, cmd.TaskAttributes);
Utilities.WriteBytesBigEndian(_lun, buffer, 8);
Utilities.WriteBytesBigEndian(expected, buffer, 20);
Utilities.WriteBytesBigEndian(_connection.Session.CommandSequenceNumber, buffer, 24);
Utilities.WriteBytesBigEndian(_connection.ExpectedStatusSequenceNumber, buffer, 28);
cmd.WriteTo(buffer, 32);
if (immediateData != null && count != 0)
{
Array.Copy(immediateData, offset, buffer, 48, count);
}
return(buffer);
}
public T Send <T>(ScsiCommand cmd, byte[] buffer, int offset, int count, int expected)
where T : ScsiResponse, new()
{
byte[] tempBuffer = new byte[expected];
int numRead = Send(cmd, buffer, offset, count, tempBuffer, 0, expected);
T result = new T();
result.ReadFrom(tempBuffer, 0, numRead);
return(result);
}
/// <summary>
/// Sends an SCSI command (aka task) to a LUN via the connected target.
/// </summary>
/// <param name="cmd">The command to send.</param>
/// <param name="outBuffer">The data to send with the command.</param>
/// <param name="outBufferOffset">The offset of the first byte to send.</param>
/// <param name="outBufferCount">The number of bytes to send, if any.</param>
/// <param name="inBuffer">The buffer to fill with returned data.</param>
/// <param name="inBufferOffset">The first byte to fill with returned data.</param>
/// <param name="inBufferMax">The maximum amount of data to receive.</param>
/// <returns>The number of bytes received.</returns>
public int Send(ScsiCommand cmd, byte[] outBuffer, int outBufferOffset, int outBufferCount, byte[] inBuffer, int inBufferOffset, int inBufferMax)
{
CommandRequest req = new CommandRequest(this, cmd.TargetLun);
int toSend = Math.Min(Math.Min(outBufferCount, Session.ImmediateData ? Session.FirstBurstLength : 0), MaxTargetReceiveDataSegmentLength);
byte[] packet = req.GetBytes(cmd, outBuffer, outBufferOffset, toSend, true, inBufferMax != 0, outBufferCount != 0, (uint)(outBufferCount != 0 ? outBufferCount : inBufferMax));
_stream.Write(packet, 0, packet.Length);
_stream.Flush();
int numApproved = 0;
int numSent = toSend;
int pktsSent = 0;
while (numSent < outBufferCount)
{
ProtocolDataUnit pdu = ReadPdu();
ReadyToTransferPacket resp = ParseResponse <ReadyToTransferPacket>(pdu);
numApproved = (int)resp.DesiredTransferLength;
uint targetTransferTag = resp.TargetTransferTag;
while (numApproved > 0)
{
toSend = Math.Min(Math.Min(outBufferCount - numSent, numApproved), MaxTargetReceiveDataSegmentLength);
DataOutPacket pkt = new DataOutPacket(this, cmd.TargetLun);
packet = pkt.GetBytes(outBuffer, outBufferOffset + numSent, toSend, toSend == numApproved, pktsSent++, (uint)numSent, targetTransferTag);
_stream.Write(packet, 0, packet.Length);
_stream.Flush();
numApproved -= toSend;
numSent += toSend;
}
}
bool isFinal = false;
int numRead = 0;
while (!isFinal)
{
ProtocolDataUnit pdu = ReadPdu();
if (pdu.OpCode == OpCode.ScsiResponse)
{
Response resp = ParseResponse <Response>(pdu);
if (resp.StatusPresent && resp.Status == ScsiStatus.CheckCondition)
{
ushort senseLength = EndianUtilities.ToUInt16BigEndian(pdu.ContentData, 0);
byte[] senseData = new byte[senseLength];
Array.Copy(pdu.ContentData, 2, senseData, 0, senseLength);
throw new ScsiCommandException(resp.Status, "Target indicated SCSI failure", senseData);
}
if (resp.StatusPresent && resp.Status != ScsiStatus.Good)
{
throw new ScsiCommandException(resp.Status, "Target indicated SCSI failure");
}
isFinal = resp.Header.FinalPdu;
}
else if (pdu.OpCode == OpCode.ScsiDataIn)
{
DataInPacket resp = ParseResponse <DataInPacket>(pdu);
if (resp.StatusPresent && resp.Status != ScsiStatus.Good)
{
throw new ScsiCommandException(resp.Status, "Target indicated SCSI failure");
}
if (resp.ReadData != null)
{
Array.Copy(resp.ReadData, 0, inBuffer, (int)(inBufferOffset + resp.BufferOffset), resp.ReadData.Length);
numRead += resp.ReadData.Length;
}
isFinal = resp.Header.FinalPdu;
}
}
Session.NextTaskTag();
Session.NextCommandSequenceNumber();
return(numRead);
}
private T Send <T>(ScsiCommand cmd, byte[] buffer, int offset, int count, int expected)
where T : ScsiResponse, new()
{
return(_currentConnection.Send <T>(cmd, buffer, offset, count, expected));
}
/// <summary>
/// Sends an SCSI command (aka task) to a LUN via the connected target.
/// </summary>
/// <param name="cmd">The command to send.</param>
/// <param name="outBuffer">The data to send with the command.</param>
/// <param name="outBufferOffset">The offset of the first byte to send.</param>
/// <param name="outBufferCount">The number of bytes to send, if any.</param>
/// <param name="inBuffer">The buffer to fill with returned data.</param>
/// <param name="inBufferOffset">The first byte to fill with returned data.</param>
/// <param name="inBufferMax">The maximum amount of data to receive.</param>
/// <returns>The number of bytes received.</returns>
private int Send(ScsiCommand cmd, byte[] outBuffer, int outBufferOffset, int outBufferCount, byte[] inBuffer, int inBufferOffset, int inBufferMax)
{
return(_currentConnection.Send(cmd, outBuffer, outBufferOffset, outBufferCount, inBuffer, inBufferOffset, inBufferMax));
}