private bool ProcessPDataTF(PDataTFRead pdu)
{
try
{
byte pcid = 0;
foreach (PDV pdv in pdu.PDVs)
{
pcid = pdv.PCID;
if (pdv.IsCommand)
{
if (_dimse.CommandData == null)
_dimse.CommandData = new ChunkStream();
_dimse.CommandData.AddChunk(pdv.Value);
if (_dimse.Command == null)
{
_dimse.Command = new DicomAttributeCollection(0x00000000, 0x0000FFFF);
}
if (_dimse.CommandReader == null)
{
_dimse.CommandReader = new DicomStreamReader(_dimse.CommandData)
{
TransferSyntax = TransferSyntax.ImplicitVrLittleEndian,
Dataset = _dimse.Command
};
}
DicomReadStatus stat =
_dimse.CommandReader.Read(null, DicomReadOptions.UseDictionaryForExplicitUN);
if (stat == DicomReadStatus.UnknownError)
{
Platform.Log(LogLevel.Error, "Unexpected parsing error when reading command group elements.");
return false;
}
_assoc.TotalBytesRead += (UInt64) pdv.PDVLength - 6;
if (DimseMessageReceiving != null)
DimseMessageReceiving(_assoc, pcid);
if (pdv.IsLastFragment)
{
if (stat == DicomReadStatus.NeedMoreData)
{
Platform.Log(LogLevel.Error,
"Unexpected end of StreamReader. More data needed ({0} bytes, last tag read {1}) after reading last PDV fragment.",
_dimse.CommandReader.BytesNeeded, _dimse.CommandReader.LastTagRead.ToString());
return false;
}
_dimse.CommandData = null;
_dimse.CommandReader = null;
bool isLast = true;
if (_dimse.Command.Contains(DicomTags.DataSetType))
{
if (_dimse.Command[DicomTags.DataSetType].GetUInt16(0, 0x0) != 0x0101)
isLast = false;
}
OnReceiveDimseCommand(pcid, _dimse.Command);
if (isLast)
{
bool ret = OnReceiveDimse(pcid, _dimse.Command, _dimse.Dataset);
if (!ret)
Platform.Log(LogLevel.Error, "Error with OnReceiveDimse");
LogSendReceive(true, _dimse.Command, _dimse.Dataset);
//_assoc.TotalBytesRead += (UInt64)total;
_dimse = null;
return ret;
}
}
}
else
{
if (_dimse.DatasetData == null)
_dimse.DatasetData = new ChunkStream();
if (_dimse.Dataset == null)
_dimse.Dataset = new DicomAttributeCollection(0x00040000, 0xFFFFFFFF);
if (_dimse.DatasetReader == null)
{
_dimse.DatasetReader = new DicomStreamReader(_dimse.DatasetData)
{
TransferSyntax = _assoc.GetAcceptedTransferSyntax(pdv.PCID),
Dataset = _dimse.Dataset
};
}
if (!_dimse.DatasetReader.EncounteredStopTag)
{
_dimse.DatasetData.AddChunk(pdv.Value);
_dimse.ParseDatasetStatus = _dimse.DatasetReader.Read(_dimse.DatasetStopTag, DicomReadOptions.UseDictionaryForExplicitUN);
if (_dimse.ParseDatasetStatus == DicomReadStatus.UnknownError)
{
Platform.Log(LogLevel.Error, "Unexpected parsing error when reading DataSet.");
return false;
}
}
_assoc.TotalBytesRead += (UInt64) pdv.PDVLength - 6;
if (DimseMessageReceiving != null)
DimseMessageReceiving(_assoc, pcid);
bool ret = true;
if (_dimse.StreamMessage)
{
if (_dimse.IsNewDimse)
{
byte[] fileGroup2 = CreateFileHeader(pcid, _dimse.Command);
ret = OnReceiveFileStream(pcid, _dimse.Command, _dimse.Dataset, fileGroup2, 0, fileGroup2.Length, _dimse.DatasetReader.EncounteredStopTag, _dimse.IsNewDimse, false);
_dimse.IsNewDimse = false;
}
ret = ret && OnReceiveFileStream(pcid, _dimse.Command, _dimse.Dataset, pdv.Value.Array, pdv.Value.Index, pdv.Value.Count, _dimse.DatasetReader.EncounteredStopTag, false, pdv.IsLastFragment);
if (!ret)
Platform.Log(LogLevel.Error, "Error with OnReceiveFileStream");
}
if (pdv.IsLastFragment)
{
if (_dimse.ParseDatasetStatus == DicomReadStatus.NeedMoreData)
{
Platform.Log(LogLevel.Error,
"Unexpected end of StreamReader. More data needed ({0} bytes, last tag read {1}) after reading last PDV fragment.",
_dimse.DatasetReader.BytesNeeded, _dimse.DatasetReader.LastTagRead.ToString());
return false;
}
_dimse.CommandData = null;
_dimse.CommandReader = null;
LogSendReceive(true, _dimse.Command, _dimse.Dataset);
if (!_dimse.StreamMessage)
{
ret = OnReceiveDimse(pcid, _dimse.Command, _dimse.Dataset);
if (!ret)
Platform.Log(LogLevel.Error, "Error with OnReceiveDimse");
}
else
{
if (MessageReceived != null)
MessageReceived(_assoc, new DicomMessage(_dimse.Command, _dimse.Dataset));
}
_dimse = null;
return ret;
}
if (!ret) return false;
}
}
return true;
}
catch (Exception e)
{
//do something here!
Platform.Log(LogLevel.Error, e, "Unexpected exception processing P-DATA PDU");
return false;
}
}
private bool ProcessRawPDU(RawPDU raw)
{
try
{
Platform.Log(LogLevel.Debug, "Received PDU: {0}", raw.ToString());
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 PDataTFRead();
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;
}
}