private void ParsePositionTime()
{
//InformationField
ParseDateTime(InformationField.Substring(0, 7));
string psr = InformationField.Substring(7);
//after parsing position and symbol from the information field
//all that can be left is a comment
Comment = ParsePositionAndSymbol(psr);
//ignoring weather data "_" for now
}
private string getValue(InformationField field)
{
fields.TryGetValue(field, out string result);
return(result);
}
private void ParseMicE()
{
char ConvertDest(char ch)
{
int ci = ch - 0x30; //adjust all to be 0 based
if (ci == 0x1C)
{
ci = 0x0A; //change L to be a space digit
}
if ((ci > 0x10) && (ci <= 0x1B))
{
ci = ci - 1; //A-K need to be decremented
}
if ((ci & 0x0F) == 0x0A)
{
ci = ci & 0xF0; //space is converted to 0 - we don't support ambiguity
}
return((char)ci);
}
string dest = DestCallsign.StationCallsign;
if (dest.Length < 6 || dest.Length == 7)
{
return;
}
//validate
bool custom = (((dest[0] >= 'A') && (dest[0] <= 'K')) || ((dest[1] >= 'A') && (dest[1] <= 'K')) || ((dest[2] >= 'A') && (dest[2] <= 'K')));
for (int j = 0; j < 3; j++)
{
var ch = dest[j];
if (custom)
{
if ((ch < '0') || (ch > 'L') || ((ch > '9') && (ch < 'A')))
{
return;
}
}
else
{
if ((ch < '0') || (ch > 'Z') || ((ch > '9') && (ch < 'L')) || ((ch > 'L') && (ch < 'P')))
{
return;
}
}
}
for (int j = 3; j < 6; j++)
{
var ch = dest[j];
if ((ch < '0') || (ch > 'Z') || ((ch > '9') && (ch < 'L')) || ((ch > 'L') && (ch < 'P')))
{
return;
}
}
if (dest.Length > 6)
{
if ((dest[6] != '-') || (dest[7] < '0') || (dest[7] > '9'))
{
return;
}
if (dest.Length == 9)
{
if ((dest[8] < '0') || (dest[8] > '9'))
{
return;
}
}
}
//parse the destination field
int c = ConvertDest(dest[0]);
int mes = 0; //message code
if ((c & 0x10) != 0)
{
mes = 0x08; //set the custom flag
}
if (c >= 0x10)
{
mes = mes + 0x04;
}
int d = (c & 0x0F) * 10; //degrees
c = ConvertDest(dest[1]);
if (c >= 0x10)
{
mes = mes + 0x02;
}
d = d + (c & 0x0F);
c = ConvertDest(dest[2]);
if (c >= 0x10)
{
mes += 1;
}
//save message index
MessageData.MsgIndex = mes;
int m = (c & 0x0F) * 10; //minutes
c = ConvertDest(dest[3]);
bool north = c >= 0x20;
m = m + (c & 0x0F);
c = ConvertDest(dest[4]);
bool hundred = c >= 0x20; //flag for adjustment
int s = (c & 0x0F) * 10; //hundredths of minutes
c = ConvertDest(dest[5]);
bool west = c >= 0x20;
s = s + (c & 0x0F);
double lat = d + (m / 60.0) + (s / 6000.0);
if (!north)
{
lat = -lat;
}
Position.CoordinateSet.Latitude = new Coordinate(lat, true);
//parse the symbol
if (InformationField.Length > 6)
{
SymbolCode = InformationField[6];
}
if (InformationField.Length > 7)
{
SymbolTableIdentifier = InformationField[7];
}
//set D7/D700 flags
if (InformationField.Length > 8)
{
FromD7 = InformationField[8] == '>';
FromD700 = InformationField[8] == ']';
}
//parse the longitude
d = InformationField[0] - 28;
m = InformationField[1] - 28;
s = InformationField[2] - 28;
//validate
if ((d < 0) || (d > 99) || (m < 0) || (m > 99) || (s < 0) || (s > 99))
{
Position.Clear();
return;
}
//adjust the degrees value
if (hundred)
{
d = d + 100;
}
if (d >= 190)
{
d = d - 190;
}
else if (d >= 180)
{
d = d - 80;
}
//adjust minutes 0-9 to proper spot
if (m >= 60)
{
m = m - 60;
}
double lon = d + (m / 60.0) + (s / 6000.0);
if (west)
{
lon = -lon;
}
Position.CoordinateSet.Longitude = new Coordinate(lon, false);
//record comment
Comment = InformationField.Length > 8 ? InformationField.Substring(8) : string.Empty;
if (InformationField.Length > 5)
{
//parse the Speed/Course (s/d)
m = InformationField[4] - 28;
if ((m < 0) || (m > 97))
{
return;
}
s = InformationField[3] - 28;
if ((s < 0) || (s > 99))
{
return;
}
s = (int)Math.Round((double)((s * 10) + (m / 10))); //speed in knots
d = InformationField[5] - 28;
if ((d < 0) || (d > 99))
{
return;
}
d = ((m % 10) * 100) + d; //course
if (s >= 800)
{
s = s - 800;
}
if (d >= 400)
{
d = d - 400;
}
if (d > 0)
{
Position.Course = d;
Position.Speed = s;
}
}
}
