A very fast NMEA parser. The speed is achieved by
using System.Buffers, System.IO.Pipelines, Span<T> and related bits and pieces
avoiding as many allocations as possible.
(This is my first foray into Buffers and Pipelines... Be Gentle!)
Synchronous:
using (var nr = new NmeaReader(File.Open("track2.nmea")))
{
while (true)
{
var message = nr.ReadNext();
if (message == null)
{
break;
}
Console.WriteLine(message);
}
}Asynchronous:
using (var nr = new NmeaReader(File.Open("track2.nmea")))
{
while (true)
{
var message = await nr.ReadNextAsync().ConfigureAwait(false);
if (message == null)
{
break;
}
Console.WriteLine(message);
}
}Bloody freaking crazy Asynchronous:
var nsr = NmeaStreamReader.Create();
using (var reader = File.Open("track1.nmea"))
{
await nsr.ParseStreamAsync(reader, (s) =>
{
Console.WriteLine(message);
}).ConfigureAwait(false);
}If you are only interested in a specific NMEA sentence then build the NmeaStreamReader yourself:
var nsr = new NmeaStreamReader().Register(new GGA());Parsers are available for:
- GPGGA
- GPGLL
- GPGSA
- GPGSV
- GPRMC
But don't despair! It's easy to add new sentences.
public class GLL : NmeaMessage
{
private static readonly ReadOnlyMemory<Byte> KEY = Encoding.UTF8.GetBytes("$GPGLL").AsMemory();
protected override ReadOnlyMemory<Byte> Key => KEY;
public Double Latitude { get; private set; }
public Double Longitude { get; private set; }
public TimeSpan FixTime { get; private set; }
public Char DataActive { get; private set; }
public override String ToString() => $"GPGLL {Latitude} {Longitude} {FixTime} {DataActive}";
public override NmeaMessage Parse(ReadOnlySequence<Byte> sentence)
{
var lexer = new Lexer(sentence);
if (lexer.NextString() != "GPGLL")
{
throw lexer.Error();
}
return new GLL()
{
Latitude = lexer.NextLatitude(),
Longitude = lexer.NextLongitude(),
FixTime = lexer.NextTimeSpan(),
DataActive = lexer.NextChar(),
Checksum = lexer.NextChecksum()
};
}
}
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