/// <summary>
/// Decode Gps element
/// </summary>
/// <returns></returns>
private GpsElement DecodeGpsElement()
{
var longitude = _reader.ReadInt32();
var latitude = _reader.ReadInt32();
var altitude = _reader.ReadInt16();
var angle = _reader.ReadInt16();
var satellites = _reader.ReadByte();
var speed = _reader.ReadInt16();
return(GpsElement.Create(longitude, latitude, altitude, speed, angle, satellites));
}
/// <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));
}
