public void RequestFile(int ca, int ioa, NameOfFile nof, IFileReceiver fileReceiver)
{
this.ca = ca;
this.ioa = ioa;
this.nof = nof;
this.fileReceiver = fileReceiver;
ASDU selectFile = NewAsdu(new FileCallOrSelect(ioa, nof, 0, SelectAndCallQualifier.SELECT_FILE));
master.SendASDU(selectFile);
state = FileClientState.WAITING_FOR_FILE_READY;
}
public bool HandleFileAsdu(ASDU asdu)
{
bool asduHandled = true;
switch (asdu.TypeId)
{
case TypeID.F_SC_NA_1: /* File/Section/Directory Call/Select */
DebugLog("Received SELECT/CALL");
if (state == FileClientState.WAITING_FOR_FILE_READY)
{
if (asdu.Cot == CauseOfTransmission.UNKNOWN_TYPE_ID)
{
if (fileReceiver != null)
{
fileReceiver.Finished(FileErrorCode.UNKNOWN_SERVICE);
}
}
else if (asdu.Cot == CauseOfTransmission.UNKNOWN_COMMON_ADDRESS_OF_ASDU)
{
if (fileReceiver != null)
{
fileReceiver.Finished(FileErrorCode.UNKNOWN_CA);
}
}
else if (asdu.Cot == CauseOfTransmission.UNKNOWN_INFORMATION_OBJECT_ADDRESS)
{
if (fileReceiver != null)
{
fileReceiver.Finished(FileErrorCode.UNKNOWN_IOA);
}
}
else
{
if (fileReceiver != null)
{
fileReceiver.Finished(FileErrorCode.PROTOCOL_ERROR);
}
}
}
else
{
if (fileReceiver != null)
{
fileReceiver.Finished(FileErrorCode.PROTOCOL_ERROR);
}
}
ResetStateToIdle();
break;
case TypeID.F_FR_NA_1: /* File ready */
DebugLog("Received FILE READY");
if (state == FileClientState.WAITING_FOR_FILE_READY)
{
//TODO check ca, ioa, nof
FileReady fileReady = (FileReady)asdu.GetElement(0);
if (fileReady.Positive)
{
ASDU callFile = NewAsdu(new FileCallOrSelect(ioa, nof, 0, SelectAndCallQualifier.REQUEST_FILE));
master.SendASDU(callFile);
DebugLog("Send CALL FILE");
state = FileClientState.WAITING_FOR_SECTION_READY;
}
else
{
if (fileReceiver != null)
{
fileReceiver.Finished(FileErrorCode.FILE_NOT_READY);
}
ResetStateToIdle();
}
}
else if (state == FileClientState.IDLE)
{
//TODO call user callback to
//TODO send positive or negative ACK
state = FileClientState.WAITING_FOR_SECTION_READY;
}
else
{
AbortFileTransfer(FileErrorCode.PROTOCOL_ERROR);
}
break;
case TypeID.F_SR_NA_1: /* Section ready */
DebugLog("Received SECTION READY");
if (state == FileClientState.WAITING_FOR_SECTION_READY)
{
SectionReady sc = (SectionReady)asdu.GetElement(0);
if (sc.NotReady == false)
{
ASDU callSection = NewAsdu(new FileCallOrSelect(ioa, nof, 0, SelectAndCallQualifier.REQUEST_SECTION));
master.SendASDU(callSection);
DebugLog("Send CALL SECTION");
segmentOffset = 0;
state = FileClientState.RECEIVING_SECTION;
}
else
{
AbortFileTransfer(FileErrorCode.SECTION_NOT_READY);
}
}
else if (state == FileClientState.IDLE)
{
}
else
{
if (fileReceiver != null)
{
fileReceiver.Finished(FileErrorCode.PROTOCOL_ERROR);
}
ResetStateToIdle();
}
break;
case TypeID.F_SG_NA_1: /* Segment */
DebugLog("Received SEGMENT");
if (state == FileClientState.RECEIVING_SECTION)
{
FileSegment segment = (FileSegment)asdu.GetElement(0);
if (fileReceiver != null)
{
fileReceiver.SegmentReceived(segment.NameOfSection, segmentOffset, segment.LengthOfSegment, segment.SegmentData);
}
segmentOffset += segment.LengthOfSegment;
}
else if (state == FileClientState.IDLE)
{
}
else
{
AbortFileTransfer(FileErrorCode.PROTOCOL_ERROR);
}
break;
case TypeID.F_LS_NA_1: /* Last segment or section */
DebugLog("Received LAST SEGMENT/SECTION");
if (state != FileClientState.IDLE)
{
FileLastSegmentOrSection lastSection = (FileLastSegmentOrSection)asdu.GetElement(0);
if (lastSection.LSQ == LastSectionOrSegmentQualifier.SECTION_TRANSFER_WITHOUT_DEACT)
{
if (state == FileClientState.RECEIVING_SECTION)
{
ASDU segmentAck = NewAsdu(new FileACK(ioa, nof, lastSection.NameOfSection, AcknowledgeQualifier.POS_ACK_SECTION, FileError.DEFAULT));
master.SendASDU(segmentAck);
DebugLog("Send SEGMENT ACK");
state = FileClientState.WAITING_FOR_SECTION_READY;
}
else
{
AbortFileTransfer(FileErrorCode.PROTOCOL_ERROR);
}
}
else if (lastSection.LSQ == LastSectionOrSegmentQualifier.FILE_TRANSFER_WITH_DEACT)
{
/* slave aborted transfer */
if (fileReceiver != null)
{
fileReceiver.Finished(FileErrorCode.ABORTED_BY_REMOTE);
}
ResetStateToIdle();
}
else if (lastSection.LSQ == LastSectionOrSegmentQualifier.FILE_TRANSFER_WITHOUT_DEACT)
{
if (state == FileClientState.WAITING_FOR_SECTION_READY)
{
ASDU fileAck = NewAsdu(new FileACK(ioa, nof, lastSection.NameOfSection, AcknowledgeQualifier.POS_ACK_FILE, FileError.DEFAULT));
master.SendASDU(fileAck);
DebugLog("Send FILE ACK");
if (fileReceiver != null)
{
fileReceiver.Finished(FileErrorCode.SUCCESS);
}
ResetStateToIdle();
}
else
{
DebugLog("Illegal state: " + state.ToString());
AbortFileTransfer(FileErrorCode.PROTOCOL_ERROR);
}
}
}
break;
default:
asduHandled = false;
break;
}
return(asduHandled);
}
private void ResetStateToIdle()
{
fileReceiver = null;
state = FileClientState.IDLE;
}