public override string ToString(Frame fmsg)
{
AISFrame aisMsg = (AISFrame)fmsg;
string s = "";
foreach (AISField f in Fields)
{
s += f.Name + " = " + f.ToString(aisMsg.AISData) + "\n";
}
return(s);
}
// Methods
public AISDefn GetAISDefn(AISFrame msg)
{
AISDefn defn;
if (_aisDictionary.TryGetValue(msg.Header.MessageID, out defn))
{
return(defn);
}
else
{
return(new UnknownAISDefn());
}
}
// Methods for displaying data, refer to base Defn class
public override string EnumFieldsString(Frame fmsg)
{
AISFrame aisMsg = (AISFrame)fmsg;
string s = "";
foreach (AISField f in Fields)
{
if (f is AISEnum)
{
s += f.Name + "=" + f.ToString(aisMsg.AISData);
}
}
return(s);
}
public override string ToDebugString(Frame fmsg)
{
AISFrame aisMsg = (AISFrame)fmsg;
string bitstr = "";
foreach (byte b in aisMsg.AISData.AISBytes)
{
bitstr += Convert.ToString(b, 2).PadLeft(8, '0');
}
string retstr = "";
foreach (AISField f in Fields)
{
string fbitstr = (f.BitOffset < bitstr.Length) ? bitstr.Substring(f.BitOffset, Math.Min(f.BitLength, bitstr.Length - f.BitOffset)).PadRight(f.BitLength, 'x') : new string('x', f.BitLength);
retstr += fbitstr + " -> " + f.Name + " = " + f.ToString(aisMsg.AISData) + "\n";
}
return(retstr);
}
public override byte[] GetBytes(Frame frame)
{
N0183Frame n0183Frame = frame as N0183Frame;
if (n0183Frame != null)
{
return(Encoding.ASCII.GetBytes(n0183Frame.FullMessage + "\r\n"));
}
N2kFrame n2kFrame = frame as N2kFrame;
if (n2kFrame != null)
{
return(Encoding.ASCII.GetBytes(FrameConversion.PackN2k(n2kFrame).FullMessage + "\r\n"));
}
AISFrame aisFrame = frame as AISFrame;
if (aisFrame != null)
{
// TODO : Breaking up message if too long
int padbits = 6 * aisFrame.AISData.AISString.Length - 8 * aisFrame.AISData.AISBytes.Length; // [0, 5]
string message = "!AIVDM,1,1,,A," + aisFrame.AISData.AISString + "," + padbits;
// Add checksum
byte checksum = 0;
for (int i = 1; i < message.Length; i++)
{
checksum ^= Convert.ToByte(message[i]);
}
message += "*" + checksum.ToString("X2");
return(Encoding.ASCII.GetBytes(message + "\r\n"));
}
throw new Exception("Attempt to send unknown frame type: '" + frame.GetType().Name + "'");
}
