private bool ProcessNextPDU()
{
var raw = new RawPDU(_network);
if (raw.Type == 0x04)
{
if (_dimse == null)
{
_dimse = new DcmDimseInfo();
_assoc.TotalDimseReceived++;
}
}
raw.ReadPDU();
if (_multiThreaded)
{
_processingQueue.Enqueue(delegate
{
ProcessRawPDU(raw);
});
return true;
}
return ProcessRawPDU(raw);
}
public uint Read(RawPDU raw)
{
uint len = raw.ReadUInt32("PDV-Length");
_pcid = raw.ReadByte("Presentation Context ID");
byte mch = raw.ReadByte("Message Control Header");
_value = raw.ReadBytes("PDV Value", (int)len - 2);
_command = (mch & 0x01) != 0;
_last = (mch & 0x02) != 0;
return len + 4;
}
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;
}
}
public void Read(RawPDU raw)
{
uint len = raw.Length;
uint read = 0;
while (read < len)
{
PDV pdv = new PDV();
read += pdv.Read(raw);
_pdvs.Add(pdv);
}
}
public void Write(RawPDU pdu)
{
byte mch = (byte)((_last ? 2 : 0) + (_command ? 1 : 0));
pdu.MarkLength32("PDV-Length");
pdu.Write("Presentation Context ID", _pcid);
pdu.Write("Message Control Header", mch);
pdu.Write("PDV Value", _value);
pdu.WriteLength32();
}
public void Read(RawPDU raw)
{
uint l = raw.Length;
raw.ReadUInt16("Version");
raw.SkipBytes("Reserved", 2);
_assoc.CalledAE = raw.ReadString("Called AE", 16);
_assoc.CallingAE = raw.ReadString("Calling AE", 16);
raw.SkipBytes("Reserved", 32);
l -= 2 + 2 + 16 + 16 + 32;
while (l > 0)
{
byte type = raw.ReadByte("Item-Type");
raw.SkipBytes("Reserved", 1);
ushort il = raw.ReadUInt16("Item-Length");
l -= 4 + (uint)il;
if (type == 0x10)
{
// Application Context
raw.SkipBytes("Application Context", il);
}
else
if (type == 0x20)
{
// Presentation Context
byte id = raw.ReadByte("Presentation Context ID");
raw.SkipBytes("Reserved", 3);
il -= 4;
while (il > 0)
{
byte pt = raw.ReadByte("Presentation Context Item-Type");
raw.SkipBytes("Reserved", 1);
ushort pl = raw.ReadUInt16("Presentation Context Item-Length");
string sx = raw.ReadString("Presentation Context Syntax UID", pl);
if (pt == 0x30)
{
SopClass sopClass = SopClass.GetSopClass(sx);
if (sopClass == null)
sopClass = new SopClass("Private SOP Class", sx, false);
_assoc.AddPresentationContext(id, sopClass);
}
else if (pt == 0x40)
{
TransferSyntax transferSyntax = TransferSyntax.GetTransferSyntax(sx);
if (transferSyntax == null)
transferSyntax = new TransferSyntax("Private Syntax", sx, true, false, true, false, false, false);
_assoc.AddTransferSyntax(id, transferSyntax);
}
il -= (ushort)(4 + pl);
}
}
else
if (type == 0x50)
{
// User Information
while (il > 0)
{
byte ut = raw.ReadByte("User Information Item-Type");
raw.SkipBytes("Reserved", 1);
ushort ul = raw.ReadUInt16("User Information Item-Length");
il -= (ushort)(4 + ul);
if (ut == 0x51)
{
_assoc.RemoteMaximumPduLength = raw.ReadUInt32("Max PDU Length");
}
else if (ut == 0x52)
{
_assoc.ImplementationClass = new DicomUid(raw.ReadString("Implementation Class UID", ul), "Implementation Class UID", UidType.Unknown);
}
else if (ut == 0x53)
{
_assoc.RemoteMaxOperationsInvoked = raw.ReadUInt16("Max Operations Invoked");
_assoc.RemoteMaxOperationsPerformed = raw.ReadUInt16("Max Operations Performed");
}
else if (ut == 0x55)
{
_assoc.ImplementationVersion = raw.ReadString("Implementation Version", ul);
}
else if (ut == 0x54)
{
raw.SkipBytes("SCU/SCP Role Selection", ul);
/*
ushort rsul = raw.ReadUInt16();
if ((rsul + 4) != ul) {
throw new DicomNetworkException("SCU/SCP role selection length (" + ul + " bytes) does not match uid length (" + rsul + " + 4 bytes)");
}
raw.ReadChars(rsul); // Abstract Syntax
raw.ReadByte(); // SCU role
raw.ReadByte(); // SCP role
*/
}
else
{
Platform.Log(LogLevel.Error, "Unhandled user item: 0x{0:x2} ({1} + 4 bytes)", ut, ul);
raw.SkipBytes("Unhandled User Item", ul);
}
}
}
}
}
public RawPDU Write()
{
RawPDU pdu = new RawPDU(0x04);
foreach (PDV pdv in _pdvs)
{
pdv.Write(pdu);
}
return pdu;
}
public void Read(RawPDU raw)
{
raw.ReadUInt32("Reserved");
}
public RawPDU Write()
{
RawPDU pdu = new RawPDU((byte)0x07);
pdu.Write("Reserved", (byte)0x00);
pdu.Write("Reserved", (byte)0x00);
pdu.Write("Source", (byte)_s);
pdu.Write("Reason", (byte)_r);
return pdu;
}
public void Read(RawPDU raw)
{
raw.ReadByte("Reserved");
_rt = (DicomRejectResult)raw.ReadByte("Result");
_so = (DicomRejectSource)raw.ReadByte("Source");
_rn = (DicomRejectReason)raw.ReadByte("Reason");
}
public RawPDU Write()
{
RawPDU pdu = new RawPDU((byte)0x06);
pdu.Write("Reserved", (uint)0x00000000);
return pdu;
}
public RawPDU Write()
{
RawPDU pdu = new RawPDU((byte)0x03);
pdu.Write("Reserved", (byte)0x00);
pdu.Write("Result", (byte)_rt);
pdu.Write("Source", (byte)_so);
pdu.Write("Reason", (byte)_rn);
return pdu;
}
public void Read(RawPDU raw)
{
uint l = raw.Length;
raw.ReadUInt16("Version");
raw.SkipBytes("Reserved", 2);
raw.SkipBytes("Reserved", 16);
raw.SkipBytes("Reserved", 16);
raw.SkipBytes("Reserved", 32);
l -= 68;
while (l > 0)
{
byte type = raw.ReadByte("Item-Type");
l -= 1;
if (type == 0x10)
{
// Application Context
raw.SkipBytes("Reserved", 1);
ushort c = raw.ReadUInt16("Item-Length");
raw.SkipBytes("Value", (int)c);
l -= 3 + (uint)c;
}
else
if (type == 0x21)
{
// Presentation Context
raw.ReadByte("Reserved");
ushort pl = raw.ReadUInt16("Presentation Context Item-Length");
byte id = raw.ReadByte("Presentation Context ID");
raw.ReadByte("Reserved");
byte res = raw.ReadByte("Presentation Context Result/Reason");
raw.ReadByte("Reserved");
l -= (uint)pl + 3;
pl -= 4;
// Presentation Context Transfer Syntax
raw.ReadByte("Presentation Context Item-Type (0x40)");
raw.ReadByte("Reserved");
ushort tl = raw.ReadUInt16("Presentation Context Item-Length");
string tx = raw.ReadString("Presentation Context Syntax UID", tl);
pl -= (ushort)(tl + 4);
_assoc.SetPresentationContextResult(id, (DicomPresContextResult)res);
TransferSyntax acceptedSyntax = TransferSyntax.GetTransferSyntax(tx);
if (acceptedSyntax != null)
_assoc.SetAcceptedTransferSyntax(id, acceptedSyntax);
else
_assoc.GetPresentationContext(id).ClearTransfers();
}
else
if (type == 0x50)
{
// User Information
raw.ReadByte("Reserved");
ushort il = raw.ReadUInt16("User Information Item-Length");
l -= (uint)(il + 3);
while (il > 0)
{
byte ut = raw.ReadByte("User Item-Type");
raw.ReadByte("Reserved");
ushort ul = raw.ReadUInt16("User Item-Length");
il -= (ushort)(ul + 4);
if (ut == 0x51)
{
_assoc.RemoteMaximumPduLength = raw.ReadUInt32("Max PDU Length");
}
else if (ut == 0x52)
{
_assoc.ImplementationClass = DicomUids.Lookup(raw.ReadString("Implementation Class UID", ul));
}
else if (ut == 0x55)
{
_assoc.ImplementationVersion = raw.ReadString("Implementation Version", ul);
}
else
{
raw.SkipBytes("User Item Value", (int)ul);
}
}
}
else
{
raw.SkipBytes("Reserved", 1);
ushort il = raw.ReadUInt16("User Item-Length");
raw.SkipBytes("Unknown User Item", il);
l -= (uint)(il + 3);
}
}
}
public RawPDU Write()
{
RawPDU pdu = new RawPDU((byte)0x02);
pdu.Write("Version", (ushort)0x0001);
pdu.Write("Reserved", 0x00, 2);
pdu.Write("Called AE", _assoc.CalledAE, 16, ' ');
pdu.Write("Calling AE", _assoc.CallingAE, 16, ' ');
pdu.Write("Reserved", 0x00, 32);
// Application Context
pdu.Write("Item-Type", (byte)0x10);
pdu.Write("Reserved", (byte)0x00);
pdu.MarkLength16("Item-Length");
pdu.Write("Application Context Name", DicomUids.DICOMApplicationContextName.UID);
pdu.WriteLength16();
foreach (DicomPresContext pc in _assoc.GetPresentationContexts())
{
// Presentation Context
pdu.Write("Item-Type", (byte)0x21);
pdu.Write("Reserved", (byte)0x00);
pdu.MarkLength16("Item-Length");
pdu.Write("Presentation Context ID", (byte)pc.ID);
pdu.Write("Reserved", (byte)0x00);
pdu.Write("Result", (byte)pc.Result);
pdu.Write("Reserved", (byte)0x00);
// Transfer Syntax
pdu.Write("Item-Type", (byte)0x40);
pdu.Write("Reserved", (byte)0x00);
pdu.MarkLength16("Item-Length");
if (pc.AcceptedTransferSyntax!=null) //
pdu.Write("Transfer Syntax UID", pc.AcceptedTransferSyntax.DicomUid.UID);
pdu.WriteLength16();
pdu.WriteLength16();
}
// User Data Fields
pdu.Write("Item-Type", (byte)0x50);
pdu.Write("Reserved", (byte)0x00);
pdu.MarkLength16("Item-Length");
// Maximum PDU
pdu.Write("Item-Type", (byte)0x51);
pdu.Write("Reserved", (byte)0x00);
pdu.Write("Item-Length", (ushort)0x0004);
pdu.Write("Max PDU Length", (uint)_assoc.LocalMaximumPduLength);
// Implementation Class UID
pdu.Write("Item-Type", (byte)0x52);
pdu.Write("Reserved", (byte)0x00);
pdu.MarkLength16("Item-Length");
pdu.Write("Implementation Class UID", DicomImplementation.ClassUID.UID);
pdu.WriteLength16();
// Implementation Version
pdu.Write("Item-Type", (byte)0x55);
pdu.Write("Reserved", (byte)0x00);
pdu.MarkLength16("Item-Length");
pdu.Write("Implementation Version", DicomImplementation.Version);
pdu.WriteLength16();
pdu.WriteLength16();
return pdu;
}
private void SendRawPDU(RawPDU pdu)
{
ResetDimseTimeout();
// If the try/catch is reintroduced here, it must
// throw an exception, if the exception is just eaten,
// you can get into a case where there's repetetive errors
// trying to send PDUs, until a whole message is sent.
//try
//{
if (_network != null)
pdu.WritePDU(_network);
//}
//catch (Exception e)
//{
// OnNetworkError(e);
// throw new DicomException("Unexpected exception when writing PDU",e);
//}
ResetDimseTimeout();
}
public void Read(RawPDU raw)
{
raw.ReadByte("Reserved");
raw.ReadByte("Reserved");
_s = (DicomAbortSource)raw.ReadByte("Source");
_r = (DicomAbortReason)raw.ReadByte("Reason");
}
/// <summary>
/// Internal routine for enqueueing a PDU for transfer.
/// </summary>
/// <param name="pdu"></param>
internal void EnqueuePdu(RawPDU pdu)
{
if (_multiThreaded)
_pduQueue.Enqueue(pdu);
else
SendRawPDU(pdu);
}
public RawPDU Write()
{
RawPDU pdu = new RawPDU(0x01);
pdu.Write("Version", (ushort)0x0001);
pdu.Write("Reserved", 0x00, 2);
pdu.Write("Called AE", _assoc.CalledAE, 16, ' ');
pdu.Write("Calling AE", _assoc.CallingAE, 16, ' ');
pdu.Write("Reserved", 0x00, 32);
// Application Context
pdu.Write("Item-Type", (byte)0x10);
pdu.Write("Reserved", (byte)0x00);
pdu.MarkLength16("Item-Length");
pdu.Write("Application Context Name", DicomUids.DICOMApplicationContextName.UID);
pdu.WriteLength16();
if (_assoc.GetPresentationContexts().Count == 0)
throw new DicomException("No presentation contexts set for association");
foreach (DicomPresContext pc in _assoc.GetPresentationContexts())
{
// Presentation Context
pdu.Write("Item-Type", (byte)0x20);
pdu.Write("Reserved", (byte)0x00);
pdu.MarkLength16("Item-Length");
pdu.Write("Presentation Context ID", (byte)pc.ID);
pdu.Write("Reserved", (byte)0x00, 3);
// Abstract Syntax
pdu.Write("Item-Type", (byte)0x30);
pdu.Write("Reserved", (byte)0x00);
pdu.MarkLength16("Item-Length");
pdu.Write("Abstract Syntax UID", pc.AbstractSyntax.Uid);
pdu.WriteLength16();
if (pc.GetTransfers().Count == 0)
throw new DicomException("No transfer syntaxes set for presentation context " + pc.AbstractSyntax.Name );
// Transfer Syntax
foreach (TransferSyntax ts in pc.GetTransfers())
{
pdu.Write("Item-Type", (byte)0x40);
pdu.Write("Reserved", (byte)0x00);
pdu.MarkLength16("Item-Length");
pdu.Write("Transfer Syntax UID", ts.DicomUid.UID);
pdu.WriteLength16();
}
pdu.WriteLength16();
}
// User Data Fields
pdu.Write("Item-Type", 0x50);
pdu.Write("Reserved", 0x00);
pdu.MarkLength16("Item-Length");
// Maximum PDU
pdu.Write("Item-Type", 0x51);
pdu.Write("Reserved", 0x00);
pdu.Write("Item-Length", (ushort)0x0004);
pdu.Write("Max PDU Length", _assoc.LocalMaximumPduLength);
// Asychronous Window
if (_assoc.LocalMaxOperationsInvoked != 1 || _assoc.LocalMaxOperationsPerformed != 1)
{
pdu.Write("Item-Type", (byte) 0x53);
pdu.Write("Reserved", (byte) 0x00);
pdu.Write("Item-Length", (ushort) 0x0004);
pdu.Write("Max Operations Invoked", (ushort)_assoc.LocalMaxOperationsInvoked);
pdu.Write("Max Operations Invoked", (ushort)_assoc.LocalMaxOperationsPerformed);
}
// SCU / SCP Role Selection
// Implementation Class UID
pdu.Write("Item-Type", (byte)0x52);
pdu.Write("Reserved", (byte)0x00);
pdu.MarkLength16("Item-Length");
pdu.Write("Implementation Class UID", DicomImplementation.ClassUID.UID);
pdu.WriteLength16();
// Implementation Version
pdu.Write("Item-Type", (byte)0x55);
pdu.Write("Reserved", (byte)0x00);
pdu.MarkLength16("Item-Length");
pdu.Write("Implementation Version", DicomImplementation.Version);
pdu.WriteLength16();
pdu.WriteLength16();
return pdu;
}