/// <summary>
/// Decode Gps element
/// </summary>
/// <returns></returns>
private GpsElementExt DecodeGpsElement()
{
var mask = (GpsElementMaskCodec7)_reader.ReadByte();
float x = 0;
float y = 0;
if (mask.HasFlag(GpsElementMaskCodec7.Coordinates))
{
var lat = EndianBitConverter.Int32ToSingle(_reader.ReadInt32());
var lng = EndianBitConverter.Int32ToSingle(_reader.ReadInt32());
if (!GpsElement.IsLatValid(lat))
{
lat = 0;
}
if (!GpsElement.IsLngValid(lng))
{
lng = 0;
}
y = lat;
x = lng;
}
short altitude = 0;
if (mask.HasFlag(GpsElementMaskCodec7.Altitude))
{
altitude = _reader.ReadInt16();
}
short angle = 0;
if (mask.HasFlag(GpsElementMaskCodec7.Angle))
{
angle = (short)Math.Round(((double)_reader.ReadByte() * 360 / 256));
}
short speed = 0;
if (mask.HasFlag(GpsElementMaskCodec7.Speed))
{
speed = _reader.ReadByte();
}
var satellites = mask.HasFlag(GpsElementMaskCodec7.Satellites) ? _reader.ReadByte() : (byte)3;
var properties = new List <IoProperty>(3);
if (mask.HasFlag(GpsElementMaskCodec7.CellId))
{
var cellId = _reader.ReadInt32();
properties.Add(IoProperty.Create(Constants.CellIdPropertyId, cellId));
}
if (mask.HasFlag(GpsElementMaskCodec7.SignalQuality))
{
var signalQuality = _reader.ReadByte();
properties.Add(IoProperty.Create(Constants.SignalQualityPropertyId, signalQuality));
}
if (mask.HasFlag(GpsElementMaskCodec7.OperatorCode))
{
var code = _reader.ReadInt32();
properties.Add(IoProperty.Create(Constants.OperatorCodePropertyId, code));
}
// set the N/A position if it's not available
if (x == 0 && y == 0)
{
speed = GpsElement.InvalidGpsSpeed;
satellites = 0;
}
var gps = GpsElement.Create(x, y, altitude, speed, angle, satellites);
var io = IoElement.Create(0, properties.Count, properties);
return(new GpsElementExt(gps: gps, io: io));
}