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Build Fixes #180

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Merged
CBielstein merged 1 commit into from
Oct 5, 2025
Merged

Build Fixes #180

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58 changes: 29 additions & 29 deletions src/AprsParser/Position.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -198,35 +198,6 @@ public void Decode(string coords)
}
}

private static int DecodeBase91(string encoded)
{
var bytes = Encoding.ASCII.GetBytes(encoded);

var result = 0;
for (var i = 0; i < bytes.Length; i++)
{
result += i == bytes.Length - 1
? bytes[i] - 33
: (bytes[i] - 33) * (int)Math.Pow(91, bytes.Length - i - 1);
}

return result;
}

private static double DecodeCompressedLatitude(string coords)
{
Debug.Assert(coords.Length == 4, "Compressed latitude must be 4 characters");
var latitude = 90 - (DecodeBase91(coords) / 380926.0);
return Math.Round(latitude, 4);
}

private static double DecodeCompressedLongitude(string coords)
{
Debug.Assert(coords.Length == 4, "Compressed longitude must be 4 characters");
var longitude = -180 + (DecodeBase91(coords) / 190463.0);
return Math.Round(longitude, 4);
}

/// <summary>
/// Decode from Maidenhead Location System gridsquare to a point in the middle of the gridsquare.
/// </summary>
Expand Down Expand Up @@ -477,6 +448,35 @@ public string EncodeLongitude()
return EncodeCoordinates(CoordinateSystem.Longitude);
}

private static int DecodeBase91(string encoded)
{
var bytes = Encoding.ASCII.GetBytes(encoded);

var result = 0;
for (var i = 0; i < bytes.Length; i++)
{
result += i == bytes.Length - 1
? bytes[i] - 33
: (bytes[i] - 33) * (int)Math.Pow(91, bytes.Length - i - 1);
}

return result;
}

private static double DecodeCompressedLatitude(string coords)
{
Debug.Assert(coords.Length == 4, "Compressed latitude must be 4 characters");
var latitude = 90 - (DecodeBase91(coords) / 380926.0);
return Math.Round(latitude, 4);
}

private static double DecodeCompressedLongitude(string coords)
{
Debug.Assert(coords.Length == 4, "Compressed longitude must be 4 characters");
var longitude = -180 + (DecodeBase91(coords) / 190463.0);
return Math.Round(longitude, 4);
}

/// <summary>
/// Encode either the latitude or longitude part of a Maidenhead gridsquare.
/// </summary>
Expand Down
2 changes: 1 addition & 1 deletion src/AprsParser/RegexStrings.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -42,7 +42,7 @@ internal static class RegexStrings
/// Compressed Longitude
/// Symbol code
/// Compressed one of: course/speed, radio range, or altitude
/// Compressed data type
/// Compressed data type.
/// </summary>
public const string CompressedPosition = @"(.)(.{4})(.{4})(.)(.{2})(.)";

Expand Down