/// <summary>
/// Parses the raw packet into it's basic components
/// </summary>
/// <param name="packet"></param>
/// <returns>Returns true if successful, false otherwise</returns>
public bool Parse(string packet)
{
try
{
//split packet into basic components of:
// from callsign
// destination callsign
// digis
// packet type
// packet payload
Position.Clear();
RawPacket = packet;
DataType = PacketDataType.Unknown;
var q = packet.IndexOf(">", StringComparison.Ordinal); //separates source and dest callsigns
var p = packet.IndexOf(":", StringComparison.Ordinal); //separates header from information field
if (p == -1 || q == -1 || p <= q)
{
return(false);
}
SourcePathHeader = packet.Substring(0, p);
DataTypeCh = packet[p + 1];
DataType = AprsDataType.GetDataType(DataTypeCh);
if (DataType == PacketDataType.Unknown)
{
DataTypeCh = (char)0x00;
}
SourceCallsign = new Callsign(packet.Substring(0, q));
Digis = "";
var s = SourcePathHeader.Substring(q + 1); // remove source callsign and ">"
var comma = s.IndexOf(",", StringComparison.Ordinal);
if (comma > 0)
{
//extract the destination CallSign
DestCallsign = new Callsign(s.Substring(0, comma));
Digis = s.Substring(comma + 1);
}
else
{
DestCallsign = new Callsign(s);
}
if (DataType != PacketDataType.Unknown)
{
InformationField = packet.Substring(p + 2);
}
else
{
InformationField = packet.Substring(p + 1);
}
if (!string.IsNullOrEmpty(Digis))
{
SourcePathHeader += "," + Digis;
}
//parse information field
if (InformationField.Length > 0)
{
ParseInformationField();
}
else
{
DataType = PacketDataType.Beacon;
}
//compute gridsquare if not given
if (Position.IsValid() && string.IsNullOrEmpty(Position.Gridsquare))
{
Position.Gridsquare = AprsUtil.LatLonToGridSquare(Position.CoordinateSet);
}
//validate required elements
//todo:
return(true);
}
catch (Exception ex)
{
RaiseParseErrorEvent(packet, ex.Message);
return(false);
}
}
public bool ParseRegEx(string packet)
{
try
{
//split packet into basic components of:
// from callsign
// destination callsign
// digis
// packet type
// packet payload
Position.Clear();
RawPacket = packet;
DataType = PacketDataType.Unknown;
if (_regexAprsPacket.IsMatch(packet))
{
var m = _regexAprsPacket.Match(packet);
var g = m.Groups;
if (g.Count >= 5)
{
var idx = 0;
RawPacket = g[idx++].Value;
SourceCallsign = new Callsign(g[idx++].Value);
DestCallsign = new Callsign(g[idx++].Value);
//if less than 6 groups no digis
Digis = g.Count < 6 ? string.Empty : g[idx++].Value;
DataTypeCh = g[idx++].Value[0];
DataType = AprsDataType.GetDataType(DataTypeCh);
InformationField = g[idx].Value;
SourcePathHeader = SourceCallsign.StationCallsign + '>' + DestCallsign.StationCallsign;
if (!string.IsNullOrEmpty(Digis))
{
SourcePathHeader += "," + Digis;
}
//parse information field
if (InformationField.Length > 0)
{
ParseInformationField();
}
else
{
DataType = PacketDataType.Beacon;
}
//compute gridsquare if not given
if (Position.IsValid() && string.IsNullOrEmpty(Position.Gridsquare))
{
Position.Gridsquare = AprsUtil.LatLonToGridSquare(Position.CoordinateSet);
}
return(true);
}
}
return(false);
}
catch (Exception ex)
{
RaiseParseErrorEvent(packet, ex.Message);
return(false);
}
}
