/// <summary>
/// Decode single AVL data
/// </summary>
/// <returns></returns>
private AvlData DecodeAvlData()
{
var priorityAndTimestamp = _reader.ReadInt32();
// priority
var priorityMapIndex = 0x03 & (priorityAndTimestamp >> 30);
var priority = (GhAvlDataPriority)priorityMapIndex;
// timestamp
var timestamp = (long)(priorityAndTimestamp & 0x3FFFFFFF);
var dateTime = GHepoch.AddSeconds(timestamp);
var eventId = 0;
IoProperty?alarmProperty = null;
if (priority == GhAvlDataPriority.Alarm)
{
eventId = Constants.AlarmPropertyId;
alarmProperty = IoProperty.Create(Constants.AlarmPropertyId, 1);
}
// global mask Codec7
var mask = (GlobalMaskCodec7)_reader.ReadByte();
var gps = GpsElement.Default;
var gpsIo = new IoElement();
if (mask.HasFlag(GlobalMaskCodec7.GpsElement))
{
var element = DecodeGpsElement();
gps = element.GPS;
gpsIo = element.IO;
}
var ioInt8 = GetProperties(mask, GlobalMaskCodec7.IoInt8, FieldEncoding.Int8);
var ioInt16 = GetProperties(mask, GlobalMaskCodec7.IoInt16, FieldEncoding.Int16);
var ioInt32 = GetProperties(mask, GlobalMaskCodec7.IoInt32, FieldEncoding.Int32);
var properties = new List <IoProperty>();
if (alarmProperty != null)
{
properties.Add(alarmProperty.Value);
}
properties.AddRange(gpsIo.Properties);
properties.AddRange(ioInt8 ?? Enumerable.Empty <IoProperty>());
properties.AddRange(ioInt16 ?? Enumerable.Empty <IoProperty>());
properties.AddRange(ioInt32 ?? Enumerable.Empty <IoProperty>());
var ioElement = IoElement.Create(eventId, properties.Count(), properties);
return(AvlData.Create(priority.ToString(), dateTime, gps, ioElement));
}
public IoElement DecodeIoElement(FieldEncoding encoding)
{
var count = _reader.ReadByte();
var properties = new List <IoProperty>(count);
for (var i = 0; i < count; i++)
{
properties.Add(DecodeProperty(encoding));
}
return(IoElement.Create(0, properties.Count(), properties));
}
/// <summary>
/// Decode single AVL data
/// </summary>
/// <returns></returns>
private AvlData DecodeAvlData()
{
var timestamp = _reader.ReadInt64();
var dateTime = AvlEpoch.AddMilliseconds(timestamp);
var priority = (AvlDataPriority)_reader.ReadByte();
// GPS element decoding
var gpsElement = DecodeGpsElement();
// IO Element decoding
var eventId = _reader.ReadByte();
var propertiesCount = _reader.ReadByte();
// IO Element Properties decoding
var ioProperties = DecodeIoProperties();
var ioElement = IoElement.Create(eventId, propertiesCount, ioProperties);
return(AvlData.Create(priority.ToString(), dateTime, gpsElement, ioElement));
}
/// <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));
}