/// <summary>
/// Method to send an association abort PDU.
/// </summary>
/// <param name="source">The source of the abort.</param>
/// <param name="reason">The reason for the abort.</param>
public void SendAssociateAbort(DicomAbortSource source, DicomAbortReason reason)
{
if (State != DicomAssociationState.Sta13_AwaitingTransportConnectionClose)
{
var pdu = new AAbort(source, reason);
EnqueuePdu(pdu.Write());
State = DicomAssociationState.Sta13_AwaitingTransportConnectionClose;
if (AssociationAborted != null)
AssociationAborted(_assoc, reason);
}
else
{
Platform.Log(LogLevel.Error, "Unexpected state for association abort, closing connection from {0} to {1}",
_assoc.CallingAE, _assoc.CalledAE);
OnNetworkError(null, true);
if (NetworkClosed != null)
NetworkClosed("Unexpected state for association abort");
}
}
private bool ProcessRawPDU(RawPDU raw)
{
try
{
switch (raw.Type)
{
case 0x01:
{
_assoc = new ServerAssociationParameters();
var pdu = new AAssociateRQ(_assoc);
pdu.Read(raw);
State = DicomAssociationState.Sta3_AwaitingLocalAAssociationResponsePrimative;
OnReceiveAssociateRequest(_assoc as ServerAssociationParameters);
if (State != DicomAssociationState.Sta13_AwaitingTransportConnectionClose &&
State != DicomAssociationState.Sta6_AssociationEstablished)
{
Platform.Log(LogLevel.Error, "Association incorrectly not accepted or rejected, aborting.");
return false;
}
//if derived class call SendAssociateAccept, it has fired this event
//if (AssociationEstablished != null)
// AssociationEstablished(_assoc);
return true;
}
case 0x02:
{
var pdu = new AAssociateAC(_assoc);
pdu.Read(raw);
State = DicomAssociationState.Sta6_AssociationEstablished;
OnReceiveAssociateAccept(_assoc);
if (AssociationEstablished != null)
AssociationEstablished(_assoc);
return true;
}
case 0x03:
{
var pdu = new AAssociateRJ();
pdu.Read(raw);
State = DicomAssociationState.Sta13_AwaitingTransportConnectionClose;
if (AssociationRejected != null)
AssociationRejected(pdu.Source, pdu.Reason);
OnReceiveAssociateReject(pdu.Result, pdu.Source, pdu.Reason);
return true;
}
case 0x04:
{
var pdu = new PDataTF();
pdu.Read(raw);
return ProcessPDataTF(pdu);
}
case 0x05:
{
var pdu = new AReleaseRQ();
pdu.Read(raw);
State = DicomAssociationState.Sta8_AwaitingAReleaseRPLocalUser;
OnReceiveReleaseRequest();
return true;
}
case 0x06:
{
var pdu = new AReleaseRP();
pdu.Read(raw);
State = DicomAssociationState.Sta13_AwaitingTransportConnectionClose;
if (AssociationReleased != null)
AssociationReleased(_assoc);
OnReceiveReleaseResponse();
return true;
}
case 0x07:
{
var pdu = new AAbort();
pdu.Read(raw);
State = DicomAssociationState.Sta1_Idle;
if (AssociationAborted != null)
AssociationAborted(_assoc, pdu.Reason);
OnReceiveAbort(pdu.Source, pdu.Reason);
return true;
}
case 0xFF:
{
Platform.Log(LogLevel.Error, "Unexpected PDU type: 0xFF. Potential parsing error.");
return false;
}
default:
throw new DicomNetworkException("Unknown PDU type");
}
}
catch (Exception e)
{
OnNetworkError(e, true);
if (NetworkError != null)
NetworkError(e);
Platform.Log(LogLevel.Error, e, "Unexpected exception when processing PDU.");
return false;
}
}