public void ResetParser()
{
lock (_locker)
{
_parserState = FrameReceiveStates.FRS_SOF_HUNT;
ResetReceivingDataFrameBuffer();
}
}
private byte[] ParseRawData(byte buffer, bool isOutcome, DateTime timeStamp, bool isFromFile)
{
byte[] ret = null;
AddToReceivingDataFrameBuffer(buffer);
lock (_locker)
{
switch (_parserState)
{
case FrameReceiveStates.FRS_SOF_HUNT:
_isTestInterface = false;
if (HeaderTypes.StartOfFrame == (HeaderTypes)buffer)
{
ResetReceivingDataFrameBuffer();
AddToReceivingDataFrameBuffer(buffer);
ReceivingDataFrame = new DataFrame(SessionId, DataFrameTypes.Data, isFromFile, isOutcome, timeStamp);
_parserState = FrameReceiveStates.FRS_LENGTH;
}
// Acknowledge received from peer.
else if (HeaderTypes.Acknowledge == (HeaderTypes)buffer)
{
FrameBufferBlock.Acknowledge(true);
ReceivingDataFrame = new DataFrame(SessionId, DataFrameTypes.Ack, isFromFile, isOutcome, timeStamp);
ReceivingDataFrame.SetBuffer(ACK, 0, 1);
OnFrameReceived();
}
// Not Acknowledge received from peer.
else if (HeaderTypes.NotAcknowledged == (HeaderTypes)buffer)
{
ReceivingDataFrame = new DataFrame(SessionId, DataFrameTypes.NAck, isFromFile, isOutcome, timeStamp);
ReceivingDataFrame.SetBuffer(NAK, 0, 1);
OnFrameReceived();
}
// CAN frame received - peer dropped a data frame transmitted by us.
else if (HeaderTypes.Can == (HeaderTypes)buffer)
{
FrameBufferBlock.Acknowledge(false);
ReceivingDataFrame = new DataFrame(SessionId, DataFrameTypes.CAN, isFromFile, isOutcome, timeStamp);
ReceivingDataFrame.SetBuffer(CAN, 0, 1);
OnFrameReceived();
}
break;
case FrameReceiveStates.FRS_LENGTH:
if (buffer == 0)
{
_parserState = FrameReceiveStates.FRS_LENGHT2;
_isTestInterface = true;
}
else if (buffer < MIN_FRAME_SIZE || buffer > MAX_FRAME_SIZE)
{
_parserState = FrameReceiveStates.FRS_SOF_HUNT;
}
else
{
ReceivingDataFrameLength = (byte)(buffer + 1); // Payload size is excluding len field.
_parserState = FrameReceiveStates.FRS_TYPE;
}
break;
case FrameReceiveStates.FRS_LENGHT2:
if (buffer < MIN_FRAME_SIZE || buffer > MAX_FRAME_SIZE)
{
_parserState = FrameReceiveStates.FRS_SOF_HUNT;
}
else
{
ReceivingDataFrameLength = (byte)(buffer + 1); // Payload size is excluding len field.
_parserState = FrameReceiveStates.FRS_COMMAND;
}
break;
case FrameReceiveStates.FRS_TYPE:
if (buffer == (byte)FrameTypes.Request || buffer == (byte)FrameTypes.Response)
{
_parserState = FrameReceiveStates.FRS_COMMAND;
}
else
{
_parserState = FrameReceiveStates.FRS_SOF_HUNT;
}
break;
case FrameReceiveStates.FRS_COMMAND:
if (_receivingDataFrameLengthCounter == ReceivingDataFrameLength)
{
_parserState = FrameReceiveStates.FRS_CHECKSUM;
}
else
{
_parserState = FrameReceiveStates.FRS_DATA;
}
break;
case FrameReceiveStates.FRS_DATA:
if (_receivingDataFrameLengthCounter > ReceivingDataFrameLength)
{
_parserState = FrameReceiveStates.FRS_SOF_HUNT;
}
else if (_receivingDataFrameLengthCounter == ReceivingDataFrameLength)
{
_parserState = FrameReceiveStates.FRS_CHECKSUM;
}
break;
case FrameReceiveStates.FRS_CHECKSUM:
// Frame received successfully -> Send acknowledge (ACK).
ReceivingDataFrame.SetBuffer(_receivingDataFrameBuffer, 0, _receivingDataFrameLengthCounter);
if (_isTestInterface)
{
if (!isFromFile)
{
WriteData(ACK);
}
}
else
{
if (!isFromFile && ReceivingDataFrame.IsChecksumValid(buffer))
{
WriteData(ACK);
}
// Frame receive failed -> Send NAK.
else if (!isFromFile)
{
WriteData(NAK);
}
}
OnFrameReceived();
_parserState = FrameReceiveStates.FRS_SOF_HUNT;
break;
case FrameReceiveStates.FRS_RX_TIMEOUT:
default:
_parserState = FrameReceiveStates.FRS_SOF_HUNT;
break;
}
}
return(ret);
}