private readonly byte[] _packetData; // TSIP data packet
public TsipPacket()
{
_counter = 0;
_length = 0;
_status = TsipParserStatus.Empty;
PacketType = 0;
_packetData = new byte[MaxRptbuf];
}
private TsipParserStatus _status; // TSIP packet format/parse status
#endregion Fields
#region Constructors
public TsipPacket()
{
_counter = 0;
_length = 0;
_status = TsipParserStatus.Empty;
PacketType = 0;
_packetData = new byte[MaxRptbuf];
}
/// <summary>
/// Accumulates bytes from the receiver, strips control bytes (DLE)
/// and checks for a valid packet end sequence (DLE ETX).
/// Note: Use the IsComplete property to determine if a complete packet is available.
/// </summary>
public void AddByte(UInt16 inbyte)
{
// avoid bogus bytes
if ((inbyte & (UInt16)0xFF00) != 0)
{
return;
}
var newbyte = (byte)(inbyte & 0x00FF);
switch (this._status)
{
case TsipParserStatus.DLE1:
{
switch (newbyte)
{
case 0:
case (byte)TsipControlBytes.ETX: // illegal TSIP id
//Debug.Print("Parse Error: Illegal TSIP id = {0:X}", newbyte);
_length = 0;
_status = TsipParserStatus.Empty;
break;
case (byte)TsipControlBytes.DLE: // try normal message start again
_length = 0;
_status = TsipParserStatus.DLE1;
break;
default: // legal TSIP ID; start message
PacketType = newbyte;
_length = 0;
_status = TsipParserStatus.Data;
break;
}
break;
}
case TsipParserStatus.Data:
{
switch (newbyte)
{
case (byte)TsipControlBytes.DLE: // expect DLE or ETX next
_status = TsipParserStatus.DLE2;
break;
default: // normal data here
_packetData[this._length++] = newbyte;
break;
}
break;
}
case TsipParserStatus.DLE2:
{
switch (newbyte)
{
case (byte)TsipControlBytes.DLE: // normal data byte
_packetData[this._length++] = newbyte;
_status = TsipParserStatus.Data;
break;
case (byte)TsipControlBytes.ETX: // end of message
_status = TsipParserStatus.Full;
break;
default: // error: treat as DLE1; start a new report packet
Debug.Print("Parse Error: Treat as DLE1");
PacketType = newbyte;
_length = 0;
_status = TsipParserStatus.Data;
break;
}
break;
}
case TsipParserStatus.Full:
case TsipParserStatus.Empty:
default:
{
switch (newbyte)
{
case (byte)TsipControlBytes.DLE: // normal message start
_length = 0;
_status = TsipParserStatus.DLE1;
break;
default: // error: ignore the new byte
//Debug.Print("Parse Error: {1} Ignore new byte {0:X}", newbyte, this.status.ToString());
_length = 0;
_status = TsipParserStatus.Empty;
break;
}
break;
}
}
if (_length >= MaxRptbuf)
{
//Debug.Print("Parse Error: {1} Buffer Length Exceeded {0}", this.length, this.status.ToString());
_length = 0;
_status = TsipParserStatus.Empty;
}
}
/// <summary>
/// Accumulates bytes from the receiver, strips control bytes (DLE)
/// and checks for a valid packet end sequence (DLE ETX).
/// Note: Use the IsComplete property to determine if a complete packet is available.
/// </summary>
public void AddByte(UInt16 inbyte)
{
// avoid bogus bytes
if ((inbyte & (UInt16)0xFF00) != 0)
return;
var newbyte = (byte)(inbyte & 0x00FF);
switch (this._status)
{
case TsipParserStatus.DLE1:
{
switch (newbyte)
{
case 0:
case (byte)TsipControlBytes.ETX: // illegal TSIP id
//Debug.Print("Parse Error: Illegal TSIP id = {0:X}", newbyte);
_length = 0;
_status = TsipParserStatus.Empty;
break;
case (byte)TsipControlBytes.DLE: // try normal message start again
_length = 0;
_status = TsipParserStatus.DLE1;
break;
default: // legal TSIP ID; start message
PacketType = newbyte;
_length = 0;
_status = TsipParserStatus.Data;
break;
}
break;
}
case TsipParserStatus.Data:
{
switch (newbyte)
{
case (byte)TsipControlBytes.DLE: // expect DLE or ETX next
_status = TsipParserStatus.DLE2;
break;
default: // normal data here
_packetData[this._length++] = newbyte;
break;
}
break;
}
case TsipParserStatus.DLE2:
{
switch (newbyte)
{
case (byte)TsipControlBytes.DLE: // normal data byte
_packetData[this._length++] = newbyte;
_status = TsipParserStatus.Data;
break;
case (byte)TsipControlBytes.ETX: // end of message
_status = TsipParserStatus.Full;
break;
default: // error: treat as DLE1; start a new report packet
Debug.Print("Parse Error: Treat as DLE1");
PacketType = newbyte;
_length = 0;
_status = TsipParserStatus.Data;
break;
}
break;
}
case TsipParserStatus.Full:
case TsipParserStatus.Empty:
default:
{
switch (newbyte)
{
case (byte)TsipControlBytes.DLE: // normal message start
_length = 0;
_status = TsipParserStatus.DLE1;
break;
default: // error: ignore the new byte
//Debug.Print("Parse Error: {1} Ignore new byte {0:X}", newbyte, this.status.ToString());
_length = 0;
_status = TsipParserStatus.Empty;
break;
}
break;
}
}
if (_length >= MaxRptbuf)
{
//Debug.Print("Parse Error: {1} Buffer Length Exceeded {0}", this.length, this.status.ToString());
_length = 0;
_status = TsipParserStatus.Empty;
}
}
