/// <summary>
/// Generate UInt16 corresponding to header.
/// </summary>
/// <param name="header">header to be encoded</param>
/// <returns>UInt16 representation of the header</returns>
static public UInt16 Encode(FragmentHeader header)
{
UInt16 mask;
UInt16 value = 0;
UInt16 utype = (UInt16)header.Type;
mask = 0x0001; // 1 bit for type
value |= (UInt16)((utype & mask) << (byte)FragmentHeaderField.Type);
value |= (UInt16)(header.MessageSeqNumber << (byte)FragmentHeaderField.MessageNumber);
mask = 0x003F; // 6 bits for fragmentSeqNumber
value |= (UInt16)((header.FragmentSeqNumber & mask) << (byte)FragmentHeaderField.FragmentSeqNumber);
if (header.IsAckRequired)
{
mask = 0x0001;
mask = (UInt16)(mask << (byte)FragmentHeaderField.RequireAck);
value |= mask;
}
return(value);
}
/// <summary>
/// Create a frame containing a DATA fragment
/// </summary>
/// <param name="messageSeqNumber">message sequence number</param>
/// <param name="fragmentSeqNumber">fragment sequence number</param>
/// <param name="isBroadcast">true if fragment is broadcasted</param>
/// <param name="requireAck">true if an acknowledgment is required</param>
/// <param name="pduSize">max size for the sublayer payload</param>
/// <param name="reservedTail">max size for the sublayer tail</param>
/// <param name="reservedHead">max size for the sublayer header</param>
/// <param name="nbFragments">number of DATA fragments in the message</param>
/// <param name="fragmentIndex">index of the DATA fragment</param>
/// <param name="payloadData">payload</param>
/// <param name="indexPayloadData">start index in the payload </param>
/// <param name="nbBytes">number of bytes in the payload</param>
/// <returns>the generated frame</returns>
public static Frame CreateDataFrame(byte messageSeqNumber, byte fragmentSeqNumber, bool isBroadcast, bool requireAck,
int pduSize, int reservedTail, int reservedHead, byte nbFragments, byte fragmentIndex, Frame payloadData, int indexPayloadData, int nbBytes)
{
if (pduSize < 2 + 2 + nbBytes)
{
throw new ArgumentException("pdu size is too small", "pduSize");
}
FragmentHeader header = new FragmentHeader(FragmentType.DATA, messageSeqNumber, requireAck, fragmentSeqNumber);
Frame frame = Frame.GetFrame(reservedHead + reservedTail + 2 + 2 + nbBytes);
frame.ReserveHeader(reservedHead);
UInt16 serializedHdr = FragmentHeader.Encode(header);
frame.AllocBack(4);
frame.Write(0, serializedHdr);
frame.Write(2, nbFragments);
frame.Write(3, fragmentIndex);
frame.AppendToBack(payloadData, indexPayloadData, nbBytes);
return(frame);
}
/// <summary>
/// Create a frame containing an ACK fragment
/// </summary>
/// <param name="messageSeqNumber">message sequence number</param>
/// <param name="fragmentSeqNumber">fragment sequence number</param>
/// <param name="pduSize">max size for the sublayer payload</param>
/// <param name="reservedTail">max size for the sublayer tail</param>
/// <param name="reservedHead">max size for the sublayer header</param>
/// <param name="lastFragmentSeqNumberReceived">last fragment sequence number received by the receiver</param>
/// <param name="fragmentMissingTable">table of missing fragments</param>
/// <returns>the generated frame</returns>
public static Frame CreateAckFragmentFrame(byte messageSeqNumber, byte fragmentSeqNumber, int pduSize, int reservedTail, int reservedHead, byte lastFragmentSeqNumberReceived, BitArray fragmentMissingTable)
{
byte[] byteArray = BitArray.ToByteArray(fragmentMissingTable);
if (pduSize < 2 /* header */ + 1 /*last frag nb rec. */ + byteArray.Length + 1 /* size bit array */)
{
throw new ArgumentException("pdu size is too small", "pduSize");
}
FragmentHeader header = new FragmentHeader(FragmentType.ACK, messageSeqNumber, false, fragmentSeqNumber);
Frame frame = Frame.GetFrame(reservedHead + reservedTail + 2 + 1 + byteArray.Length + 1);
frame.ReserveHeader(reservedHead);
UInt16 serializedHdr = FragmentHeader.Encode(header);
frame.AllocBack(4);
frame.Write(0, serializedHdr);
frame.Write(2, lastFragmentSeqNumberReceived);
frame.Write(3, (byte)fragmentMissingTable.Length);
frame.AppendToBack(byteArray, 0, byteArray.Length);
return(frame);
}
/// <summary>
/// Generate UInt16 corresponding to header.
/// </summary>
/// <param name="header">header to be encoded</param>
/// <returns>UInt16 representation of the header</returns>
static public UInt16 Encode(FragmentHeader header)
{
UInt16 mask;
UInt16 value = 0;
UInt16 utype = (UInt16)header.Type;
mask = 0x0001; // 1 bit for type
value |= (UInt16)((utype & mask) << (byte)FragmentHeaderField.Type);
value |= (UInt16)(header.MessageSeqNumber << (byte)FragmentHeaderField.MessageNumber);
mask = 0x003F; // 6 bits for fragmentSeqNumber
value |= (UInt16)((header.FragmentSeqNumber & mask) << (byte)FragmentHeaderField.FragmentSeqNumber);
if (header.IsAckRequired)
{
mask = 0x0001;
mask = (UInt16)(mask << (byte)FragmentHeaderField.RequireAck);
value |= mask;
}
return value;
}
/// <summary>
/// Create a frame containing a DATA fragment
/// </summary>
/// <param name="messageSeqNumber">message sequence number</param>
/// <param name="fragmentSeqNumber">fragment sequence number</param>
/// <param name="isBroadcast">true if fragment is broadcasted</param>
/// <param name="requireAck">true if an acknowledgment is required</param>
/// <param name="pduSize">max size for the sublayer payload</param>
/// <param name="reservedTail">max size for the sublayer tail</param>
/// <param name="reservedHead">max size for the sublayer header</param>
/// <param name="nbFragments">number of DATA fragments in the message</param>
/// <param name="fragmentIndex">index of the DATA fragment</param>
/// <param name="payloadData">payload</param>
/// <param name="indexPayloadData">start index in the payload </param>
/// <param name="nbBytes">number of bytes in the payload</param>
/// <returns>the generated frame</returns>
public static Frame CreateDataFrame(byte messageSeqNumber, byte fragmentSeqNumber, bool isBroadcast, bool requireAck,
int pduSize, int reservedTail, int reservedHead, byte nbFragments, byte fragmentIndex, Frame payloadData, int indexPayloadData, int nbBytes)
{
if (pduSize < 2 + 2 + nbBytes)
throw new ArgumentException("pdu size is too small", "pduSize");
FragmentHeader header = new FragmentHeader(FragmentType.DATA, messageSeqNumber, requireAck, fragmentSeqNumber);
Frame frame = Frame.GetFrame(reservedHead + reservedTail + 2 + 2 + nbBytes);
frame.ReserveHeader(reservedHead);
UInt16 serializedHdr = FragmentHeader.Encode(header);
frame.AllocBack(4);
frame.Write(0, serializedHdr);
frame.Write(2, nbFragments);
frame.Write(3, fragmentIndex);
frame.AppendToBack(payloadData, indexPayloadData, nbBytes);
return frame;
}
/// <summary>
/// Create a frame containing an ACK fragment
/// </summary>
/// <param name="messageSeqNumber">message sequence number</param>
/// <param name="fragmentSeqNumber">fragment sequence number</param>
/// <param name="pduSize">max size for the sublayer payload</param>
/// <param name="reservedTail">max size for the sublayer tail</param>
/// <param name="reservedHead">max size for the sublayer header</param>
/// <param name="lastFragmentSeqNumberReceived">last fragment sequence number received by the receiver</param>
/// <param name="fragmentMissingTable">table of missing fragments</param>
/// <returns>the generated frame</returns>
public static Frame CreateAckFragmentFrame(byte messageSeqNumber, byte fragmentSeqNumber, int pduSize, int reservedTail, int reservedHead, byte lastFragmentSeqNumberReceived, BitArray fragmentMissingTable)
{
byte[] byteArray = BitArray.ToByteArray(fragmentMissingTable);
if (pduSize < 2 /* header */ + 1 /*last frag nb rec. */ + byteArray.Length + 1 /* size bit array */)
throw new ArgumentException("pdu size is too small", "pduSize");
FragmentHeader header = new FragmentHeader(FragmentType.ACK, messageSeqNumber, false, fragmentSeqNumber);
Frame frame = Frame.GetFrame(reservedHead + reservedTail + 2 + 1 + byteArray.Length + 1);
frame.ReserveHeader(reservedHead);
UInt16 serializedHdr = FragmentHeader.Encode(header);
frame.AllocBack(4);
frame.Write(0, serializedHdr);
frame.Write(2, lastFragmentSeqNumberReceived);
frame.Write(3, (byte)fragmentMissingTable.Length);
frame.AppendToBack(byteArray, 0, byteArray.Length);
return frame;
}
internal override void HandleReceivedFragment(FragmentHeader header, ref Frame payload)
{
if (header.FragmentSeqNumber == _lastFragmentSeqNumberReceived)
{
#if PRINTALL
Trace.Print("Already received this fragment. Drop.");
#endif
Frame.Release(ref payload);
return;
}
_lastFragmentSeqNumberReceived = header.FragmentSeqNumber;
if ((header.Type != FragmentType.ACK) || (header.MessageSeqNumber != _messageSeqNumber))
{
Frame.Release(ref payload);
return;
}
FragmentationMessageTerminatedEventArgs messageTerminatedHandlerArgs = null;
bool sendData = false;
lock (_lock)
{
if (_currentState == FragmentationMessageState.Disposed)
{
Frame.Release(ref payload);
return;
}
bool timerWasEnabled = _timerEnabled;
if (_timerEnabled)
{
_timer.UnregisterItem(this);
_timerEnabled = false;
}
_nbTimeoutWithoutAck = 0;
if (header.Type == FragmentType.ACK)
{
#if PRINTALL
Trace.Print("Received ACK for message " + header.MessageSeqNumber + " sduHandle=" + _sduHandle);
#endif
_nbFragmentsSentWithoutAck = 0;
BitArray fragmentMissingTable;
byte lastFragmentSeqNumberReceivedByReceived = 255;
try
{
Fragment.DecodeAckPayload(ref payload, out lastFragmentSeqNumberReceivedByReceived, out fragmentMissingTable);
Frame.Release(ref payload);
if (fragmentMissingTable.Length == _successfullyTransmittedFragments.Length)
{
BitArray fragmentReceived = fragmentMissingTable.Clone();
fragmentReceived.Not();
#if PRINTALL
string msg = "";
for (int i = 0; i < fragmentReceived.Length; i++)
{
if (fragmentReceived.Get(i))
{
msg += i + ",";
}
}
Trace.Print("received so far: " + msg);
#endif
_successfullyTransmittedFragments.Or(fragmentReceived);
if (_successfullyTransmittedFragments.CheckAllSet(true))
{
_allFragmentTransmitted = true;
_currentState = FragmentationMessageState.Final;
}
// now check if we received ACK for the last fragment that we sent.
if (lastFragmentSeqNumberReceivedByReceived == _lastFragmentSeqNumberSent)
{
long roundTripTime = (DateTime.Now.Ticks - _timeLastFragmentSent.Ticks) / TimeSpan.TicksPerMillisecond;
if (2 * roundTripTime <= (long)uint.MaxValue)
{
_timeoutForResending = (uint)(2 * roundTripTime);
}
_maxFragmentsBeforeAck++;
}
_lastFragmentSent.SetAll(false);
}
}
catch (ArgumentException)
{
// could not decode payload.
if (timerWasEnabled)
{
_timer.RegisterItem(_timeoutTicks, this);
_timerEnabled = true;
}
Frame.Release(ref payload);
return;
}
if (_allFragmentTransmitted)
{
_currentState = FragmentationMessageState.Final;
messageTerminatedHandlerArgs = new FragmentationMessageTerminatedEventArgs(_currentState, Status.Success);
}
else
{
sendData = true;
}
}
else
{
#if DEBUG
Trace.Print("Received bad fragment type for message " + header.MessageSeqNumber + " sdhHandle=" + _sduHandle);
#endif
Frame.Release(ref payload);
if (timerWasEnabled)
{
_timer.RegisterItem(_timeoutTicks, this);
_timerEnabled = true;
}
}
}
// release the lock before calling OnFragmentationMessageFinalState since upper layer handler is called.
if (messageTerminatedHandlerArgs != null)
{
OnFragmentationMessageTerminated(messageTerminatedHandlerArgs);
}
else if (sendData)
{
SendNextDataFragment(false);
}
}
internal override void HandleReceivedFragment(FragmentHeader header, ref Frame payload)
{
if (header.FragmentSeqNumber == _lastFragmentSeqNumberReceived)
{
#if DEBUG
Trace.Print("Already received this fragment. Drop.");
#endif
Frame.Release(ref payload);
return;
}
_lastFragmentSeqNumberReceived = header.FragmentSeqNumber;
if ((header.Type != FragmentType.DATA) || (payload.LengthDataUsed < 2) || (_messageSeqNumber != header.MessageSeqNumber))
{
Frame.Release(ref payload);
return;
}
byte nbFragments;
byte fragmentIndex;
Frame data;
try
{
Fragment.DecodeDataPayload(ref payload, out nbFragments, out fragmentIndex, out data);
}
catch (ArgumentException)
{
Frame.Release(ref payload);
return;
}
#if PRINTALL
Trace.Print("Receiving part " + fragmentIndex + "/" + nbFragments + " of packet " + _messageSeqNumber);
#endif
FragmentationMessageTerminatedEventArgs messageTerminatedHandlerArgs = null;
bool sendAck = false;
lock (_lock)
{
if (_currentState == FragmentationMessageState.Disposed)
{
Frame.Release(ref data);
return;
}
if (_timerEnabled)
{
_timer.UnregisterItem(this);
_timerEnabled = false;
}
if ((_fragmentMissingTable != null) && (nbFragments != _fragmentMissingTable.Length))
{
// mismatch between messages: no the same number of fragments
Frame.Release(ref data);
return;
}
FragmentationMessageState oldState = _currentState;
if (_sduCompleted)
{
Frame.Release(ref data);
if (header.IsAckRequired)
{
// resend acknowlegment
sendAck = true;
}
else
{
// leave the state unchanged
return;
}
}
else
{
switch (_currentState)
{
case FragmentationMessageState.Initial:
case FragmentationMessageState.WaitingFragments:
case FragmentationMessageState.WaitingSentStatus:
case FragmentationMessageState.WaitingTimeoutBeforeResending:
if (_currentState == FragmentationMessageState.Initial)
{
// first fragment received.
_fragmentData = new Frame[nbFragments];
_fragmentMissingTable = new BitArray(nbFragments, true);
}
_fragmentMissingTable.Set(fragmentIndex, false);
if (_fragmentData[fragmentIndex] == null)
{
_fragmentData[fragmentIndex] = data;
}
else
{
Frame.Release(ref data);
}
_sduCompleted = _fragmentMissingTable.CheckAllSet(false);
if (header.IsAckRequired)
{
sendAck = true;
}
else
{
_currentState = FragmentationMessageState.WaitingFragments;
}
if (_sduCompleted)
{
_currentState = FragmentationMessageState.Final;
messageTerminatedHandlerArgs = new FragmentationMessageTerminatedEventArgs(_currentState, Status.Success);
}
break;
case FragmentationMessageState.WaitingAck:
Frame.Release(ref data);
throw new System.InvalidOperationException("Bad state.");
case FragmentationMessageState.Disposed:
case FragmentationMessageState.Final:
case FragmentationMessageState.Unknown:
default:
Frame.Release(ref data);
break;
}
}
}
if (sendAck)
{
SendAcknowledgement();
}
if (messageTerminatedHandlerArgs != null)
{
OnFragmentationMessageTerminated(messageTerminatedHandlerArgs);
}
}
/// <summary> /// Switch to next state after receiving a new segment /// </summary> /// <param name="segment">The segment</param> internal abstract void HandleReceivedFragment(FragmentHeader header, ref Frame payload);
public void HandleLowerLayerDataIndication(object sender, ushort originatorShortAddr, ushort targetShortAddr, Frame sdu)
{
FragmentationMessage fragMsg = null;
FragmentHeader header;
lock (_lock)
{
if ((!_started) || (sdu.LengthDataUsed < 2))
{
Frame.Release(ref sdu);
return;
}
// extract fragment header.
header = FragmentHeader.Decode(sdu.ReadUInt16(0));
sdu.DeleteFromFront(2);
FragmentationMessageAssociationSet associations;
switch (header.Type)
{
case FragmentType.DATA:
associations = _inboundAssociations;
if (associations == null)
{
Frame.Release(ref sdu);
return;
}
fragMsg = (InboundFragmentationMessage)associations.GetFragmentationMessage(originatorShortAddr, targetShortAddr);
if (fragMsg != null)
{
// there is already one message with this peer. Check freshness.
if (fragMsg.MessageNumber != header.MessageSeqNumber)
{
int sqnOld = (int)fragMsg.MessageNumber;
int sqnNew = (int)header.MessageSeqNumber;
int diff = (sqnNew > sqnOld) ? sqnNew - sqnOld : sqnNew - sqnOld + 256;
if ((header.MessageSeqNumber == 0) || (diff < 128))
{
// data received is most recent.
fragMsg.Dispose();
fragMsg = null;
}
else
{
// data received is old stuff.
Frame.Release(ref sdu);
return;
}
}
}
if (fragMsg == null)
{
// new message must be started
fragMsg = new InboundFragmentationMessage(originatorShortAddr, targetShortAddr,
header.MessageSeqNumber, _lowerLayerDataRequest, _lowerMtu, _lowerHead, _lowerTail, _timer);
fragMsg.FragmentationMessageTerminated += this.HandleFragmentationMessageTerminated;
associations.SetFragmentationMessage(originatorShortAddr, targetShortAddr, fragMsg);
}
break;
case FragmentType.ACK:
associations = _outboundAssociations;
if (associations == null)
{
Frame.Release(ref sdu);
return;
}
fragMsg = (OutboundFragmentationMessage)associations.GetFragmentationMessage(targetShortAddr, originatorShortAddr);
if ((fragMsg == null) || (fragMsg.MessageNumber != header.MessageSeqNumber))
{
//no one waiting for this segment. Discard.
#if DEBUG
Trace.Print("No one waiting for this segment. Discard.");
#endif
Frame.Release(ref sdu);
return;
}
break;
default:
break;
}
}
// release the lock before calling method in FragmentMessage class
if (fragMsg != null)
{
fragMsg.HandleReceivedFragment(header, ref sdu);
}
}
internal override void HandleReceivedFragment(FragmentHeader header, ref Frame payload)
{
if (header.FragmentSeqNumber == _lastFragmentSeqNumberReceived)
{
#if DEBUG
Trace.Print("Already received this fragment. Drop.");
#endif
Frame.Release(ref payload);
return;
}
_lastFragmentSeqNumberReceived = header.FragmentSeqNumber;
if ((header.Type != FragmentType.DATA) || (payload.LengthDataUsed < 2) || (_messageSeqNumber != header.MessageSeqNumber))
{
Frame.Release(ref payload);
return;
}
byte nbFragments;
byte fragmentIndex;
Frame data;
try
{
Fragment.DecodeDataPayload(ref payload, out nbFragments, out fragmentIndex, out data);
}
catch (ArgumentException)
{
Frame.Release(ref payload);
return;
}
#if PRINTALL
Trace.Print("Receiving part " + fragmentIndex + "/" + nbFragments + " of packet " + _messageSeqNumber);
#endif
FragmentationMessageTerminatedEventArgs messageTerminatedHandlerArgs = null;
bool sendAck = false;
lock (_lock)
{
if (_currentState == FragmentationMessageState.Disposed)
{
Frame.Release(ref data);
return;
}
if (_timerEnabled)
{
_timer.UnregisterItem(this);
_timerEnabled = false;
}
if ((_fragmentMissingTable != null) && (nbFragments != _fragmentMissingTable.Length))
{
// mismatch between messages: no the same number of fragments
Frame.Release(ref data);
return;
}
FragmentationMessageState oldState = _currentState;
if (_sduCompleted)
{
Frame.Release(ref data);
if (header.IsAckRequired)
{
// resend acknowlegment
sendAck = true;
}
else
{
// leave the state unchanged
return;
}
}
else
{
switch (_currentState)
{
case FragmentationMessageState.Initial:
case FragmentationMessageState.WaitingFragments:
case FragmentationMessageState.WaitingSentStatus:
case FragmentationMessageState.WaitingTimeoutBeforeResending:
if (_currentState == FragmentationMessageState.Initial)
{
// first fragment received.
_fragmentData = new Frame[nbFragments];
_fragmentMissingTable = new BitArray(nbFragments, true);
}
_fragmentMissingTable.Set(fragmentIndex, false);
if (_fragmentData[fragmentIndex] == null)
{
_fragmentData[fragmentIndex] = data;
}
else
{
Frame.Release(ref data);
}
_sduCompleted = _fragmentMissingTable.CheckAllSet(false);
if (header.IsAckRequired)
{
sendAck = true;
}
else
{
_currentState = FragmentationMessageState.WaitingFragments;
}
if (_sduCompleted)
{
_currentState = FragmentationMessageState.Final;
messageTerminatedHandlerArgs = new FragmentationMessageTerminatedEventArgs(_currentState, Status.Success);
}
break;
case FragmentationMessageState.WaitingAck:
Frame.Release(ref data);
throw new System.InvalidOperationException("Bad state.");
case FragmentationMessageState.Disposed:
case FragmentationMessageState.Final:
case FragmentationMessageState.Unknown:
default:
Frame.Release(ref data);
break;
}
}
}
if (sendAck)
{
SendAcknowledgement();
}
if (messageTerminatedHandlerArgs != null)
{
OnFragmentationMessageTerminated(messageTerminatedHandlerArgs);
}
}
internal override void HandleReceivedFragment(FragmentHeader header, ref Frame payload)
{
if (header.FragmentSeqNumber == _lastFragmentSeqNumberReceived)
{
#if PRINTALL
Trace.Print("Already received this fragment. Drop.");
#endif
Frame.Release(ref payload);
return;
}
_lastFragmentSeqNumberReceived = header.FragmentSeqNumber;
if ((header.Type != FragmentType.ACK) || (header.MessageSeqNumber != _messageSeqNumber))
{
Frame.Release(ref payload);
return;
}
FragmentationMessageTerminatedEventArgs messageTerminatedHandlerArgs = null;
bool sendData = false;
lock (_lock)
{
if (_currentState == FragmentationMessageState.Disposed)
{
Frame.Release(ref payload);
return;
}
bool timerWasEnabled = _timerEnabled;
if (_timerEnabled)
{
_timer.UnregisterItem(this);
_timerEnabled = false;
}
_nbTimeoutWithoutAck = 0;
if (header.Type == FragmentType.ACK)
{
#if PRINTALL
Trace.Print("Received ACK for message " + header.MessageSeqNumber + " sduHandle=" + _sduHandle);
#endif
_nbFragmentsSentWithoutAck = 0;
BitArray fragmentMissingTable;
byte lastFragmentSeqNumberReceivedByReceived = 255;
try
{
Fragment.DecodeAckPayload(ref payload, out lastFragmentSeqNumberReceivedByReceived, out fragmentMissingTable);
Frame.Release(ref payload);
if (fragmentMissingTable.Length == _successfullyTransmittedFragments.Length)
{
BitArray fragmentReceived = fragmentMissingTable.Clone();
fragmentReceived.Not();
#if PRINTALL
string msg = "";
for (int i = 0; i < fragmentReceived.Length; i++)
{
if (fragmentReceived.Get(i))
{
msg += i + ",";
}
}
Trace.Print("received so far: " + msg);
#endif
_successfullyTransmittedFragments.Or(fragmentReceived);
if (_successfullyTransmittedFragments.CheckAllSet(true))
{
_allFragmentTransmitted = true;
_currentState = FragmentationMessageState.Final;
}
// now check if we received ACK for the last fragment that we sent.
if (lastFragmentSeqNumberReceivedByReceived == _lastFragmentSeqNumberSent)
{
long roundTripTime = (DateTime.Now.Ticks - _timeLastFragmentSent.Ticks) / TimeSpan.TicksPerMillisecond;
if (2 * roundTripTime <= (long)uint.MaxValue)
_timeoutForResending = (uint)(2 * roundTripTime);
_maxFragmentsBeforeAck++;
}
_lastFragmentSent.SetAll(false);
}
}
catch (ArgumentException)
{
// could not decode payload.
if (timerWasEnabled)
{
_timer.RegisterItem(_timeoutTicks, this);
_timerEnabled = true;
}
Frame.Release(ref payload);
return;
}
if (_allFragmentTransmitted)
{
_currentState = FragmentationMessageState.Final;
messageTerminatedHandlerArgs = new FragmentationMessageTerminatedEventArgs(_currentState, Status.Success);
}
else
{
sendData = true;
}
}
else
{
#if DEBUG
Trace.Print("Received bad fragment type for message " + header.MessageSeqNumber + " sdhHandle=" + _sduHandle);
#endif
Frame.Release(ref payload);
if (timerWasEnabled)
{
_timer.RegisterItem(_timeoutTicks, this);
_timerEnabled = true;
}
}
}
// release the lock before calling OnFragmentationMessageFinalState since upper layer handler is called.
if (messageTerminatedHandlerArgs != null)
{
OnFragmentationMessageTerminated(messageTerminatedHandlerArgs);
}
else if (sendData)
{
SendNextDataFragment(false);
}
}
/// <summary> /// Switch to next state after receiving a new segment /// </summary> /// <param name="segment">The segment</param> internal abstract void HandleReceivedFragment(FragmentHeader header, ref Frame payload);