public static string GetStringValue(ArraySegment <byte> arraySegment, DataType dataType)
{
var subArray = arraySegment.Array.Skip(arraySegment.Offset).Take(arraySegment.Count).ToArray();
switch (dataType)
{
// Avl Data types
case DataType.CodecId:
case DataType.AvlDataCount:
case DataType.Priority:
case DataType.Satellites:
case DataType.EventIoId:
case DataType.IoCount:
case DataType.IoCount1B:
case DataType.IoId1B:
case DataType.IoValue1B:
case DataType.IoCount2B:
case DataType.IoId2B:
case DataType.IoCount4B:
case DataType.IoId4B:
case DataType.IoCount8B:
case DataType.IoId8B:
return(subArray[0].ToString());
case DataType.Latitude:
case DataType.Longitude:
return(BytesSwapper.Swap(BitConverter.ToInt32(subArray, 0)).ToString());
case DataType.IoValue4B:
return(GetSignedUnsigned32(subArray));
case DataType.Altitude:
case DataType.Angle:
case DataType.Speed:
return(BytesSwapper.Swap(BitConverter.ToInt16(subArray, 0)).ToString());
case DataType.IoValue2B:
return(GetSignedUnsigned16(subArray));
case DataType.IoValue8B:
return(GetSignedUnsigned64(subArray));
case DataType.Timestamp:
return(AvlEpoch.AddMilliseconds(BytesSwapper.Swap(BitConverter.ToInt64(subArray, 0))).ToString());
// Codec7 types
case DataType.TimestampGh:
{
var priorityAndTimeStamp = BytesSwapper.Swap(BitConverter.ToInt32(subArray, 0));
var timeStamp = (long)(priorityAndTimeStamp & 0x3FFFFFFF);
return(GHepoch.AddSeconds(timeStamp).ToString());
}
case DataType.PriorityGh:
{
string priorityAndTimestampBits = string.Join(" ", subArray.Select(x => Convert.ToString(x, 2).PadLeft(8, '0')));
return(((GhAvlDataPriority)Convert.ToInt16(priorityAndTimestampBits.Substring(0, 2))).ToString());
}
case DataType.GlobalMask:
return(((GlobalMaskCodec7)subArray[0]).ToString());
case DataType.GpsElementMask:
return(((GpsElementMaskCodec7)subArray[0]).ToString());
case DataType.LongitudeGh:
case DataType.LatitudeGh:
{
var coordinate = EndianBitConverter.ToSingle(subArray, 0);
if (!GpsElement.IsLatValid(coordinate))
{
return(0.ToString());
}
return(coordinate.ToString());
}
case DataType.AngleGh:
case DataType.SpeedGh:
return(subArray[0].ToString());
case DataType.CellIdAndLocalAreaGh:
case DataType.OperatorCodeGh:
return(BytesSwapper.Swap(BitConverter.ToInt32(subArray, 0)).ToString());
case DataType.SignalQualityGh:
return(subArray[0].ToString());
// Tcp types
case DataType.Preamble:
case DataType.AvlDataArrayLength:
case DataType.Crc:
return(GetSignedUnsigned32(subArray));
// Udp types
case DataType.Length:
case DataType.PacketId:
case DataType.ImeiLength:
return(GetSignedUnsigned16(subArray));
case DataType.PacketType:
case DataType.AvlPacketId:
return(subArray[0].ToString());
case DataType.Imei:
return(Encoding.UTF8.GetString(subArray));
default:
throw new ArgumentOutOfRangeException();
}
}
/// <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));
}