/// <summary>
/// See interface docs.
/// </summary>
/// <param name="rawMessage"></param>
/// <param name="start"></param>
/// <param name="signalLevel"></param>
/// <param name="isMlat"></param>
/// <returns></returns>
public ModeSMessage Translate(byte[] rawMessage, int start, int?signalLevel, bool isMlat)
{
if (Statistics == null)
{
throw new InvalidOperationException("Statistics must be provided before Translate can do any work");
}
ModeSMessage result = null;
var messageLength = rawMessage == null ? 0 : rawMessage.Length - start;
if (messageLength > 6)
{
_BitStream.Initialise(rawMessage);
_BitStream.Skip(start * 8);
var downlinkFormatValue = _BitStream.ReadByte(5);
if (downlinkFormatValue >= 24)
{
downlinkFormatValue = 24;
_BitStream.Skip(-3);
}
bool isLongFrame = true;
switch (downlinkFormatValue)
{
case 16:
case 17:
case 18:
case 19:
case 20:
case 21:
case 24: if (messageLength > 13)
{
result = new ModeSMessage();
}
break;
default: isLongFrame = false; result = new ModeSMessage(); break;
}
if (result != null)
{
result.SignalLevel = signalLevel;
result.IsMlat = isMlat;
result.DownlinkFormat = (DownlinkFormat)downlinkFormatValue;
switch (result.DownlinkFormat)
{
case DownlinkFormat.ShortAirToAirSurveillance: DecodeShortAirToAirSurveillance(result); break; // DF0
case DownlinkFormat.SurveillanceAltitudeReply: DecodeSurveillanceAltitudeReply(result); break; // DF4
case DownlinkFormat.SurveillanceIdentityReply: DecodeSurveillanceIdentityReply(result); break; // DF5
case DownlinkFormat.AllCallReply: DecodeAllCallReply(result); break; // DF11
case DownlinkFormat.LongAirToAirSurveillance: DecodeLongAirToAirSurveillance(result); break; // DF16
case DownlinkFormat.ExtendedSquitter: DecodeExtendedSquitter(result); break; // DF17
case DownlinkFormat.ExtendedSquitterNonTransponder: DecodeExtendedSquitterNonTransponder(result); break; // DF18
case DownlinkFormat.MilitaryExtendedSquitter: DecodeMilitaryExtendedSquitter(result); break; // DF19
case DownlinkFormat.CommBAltitudeReply: DecodeCommBAltitudeReply(result); break; // DF20
case DownlinkFormat.CommBIdentityReply: DecodeCommBIdentityReply(result); break; // DF21
case DownlinkFormat.CommD: DecodeCommD(result); break; // DF24
}
if (Statistics != null)
{
Statistics.Lock(r => {
++r.ModeSMessagesReceived;
++r.ModeSDFStatistics[(int)result.DownlinkFormat].MessagesReceived;
if (isLongFrame)
{
++r.ModeSLongFrameMessagesReceived;
}
else
{
++r.ModeSShortFrameMessagesReceived;
}
});
}
}
}
return(result);
}
public void BitStream_LengthRemaining_Returns_Zero_If_Called_After_Stream_Has_Been_Depleted()
{
_BitStream.Initialise(new byte[] { 0x0f });
_BitStream.ReadByte(8);
Assert.AreEqual(0, _BitStream.LengthRemaining);
}
/// <summary>
/// See interface docs.
/// </summary>
/// <param name="modeSMessage"></param>
/// <returns></returns>
public AdsbMessage Translate(ModeSMessage modeSMessage)
{
if (Statistics == null)
{
throw new InvalidOperationException("Statistics must be supplied before Translate can be called");
}
AdsbMessage result = null;
if (modeSMessage != null && modeSMessage.ExtendedSquitterMessage != null && modeSMessage.ExtendedSquitterMessage.Length == 7)
{
_BitStream.Initialise(modeSMessage.ExtendedSquitterMessage);
result = new AdsbMessage(modeSMessage);
if (IsCoarseFormatTisb(result))
{
DecodeCoarseTisbAirbornePosition(result);
}
else
{
result.Type = _BitStream.ReadByte(5);
switch (result.Type)
{
case 0: DecodeAirbornePosition(result); break;
case 1:
case 2:
case 3:
case 4: DecodeIdentification(result); break;
case 5:
case 6:
case 7:
case 8: DecodeSurfacePosition(result); break;
case 9:
case 10:
case 11:
case 12:
case 13:
case 14:
case 15:
case 16:
case 17:
case 18: DecodeAirbornePosition(result); break;
case 19: DecodeVelocity(result); break;
case 20:
case 21:
case 22: DecodeAirbornePosition(result); break;
case 28: DecodeAircraftStatus(result); break;
case 29: DecodeTargetStateAndStatus(result); break;
case 31: DecodeAircraftOperationalStatus(result); break;
}
}
if (Statistics != null)
{
Statistics.Lock(r => {
++r.AdsbCount;
++r.AdsbMessageFormatCount[(int)result.MessageFormat];
++r.AdsbTypeCount[result.Type];
});
}
}
return(result);
}
/// <summary>
/// See interface docs.
/// </summary>
/// <param name="modeSMessage"></param>
/// <returns></returns>
public AdsbMessage Translate(ModeSMessage modeSMessage)
{
AdsbMessage result = null;
if (modeSMessage != null && modeSMessage.ExtendedSquitterMessage != null && modeSMessage.ExtendedSquitterMessage.Length == 7)
{
_BitStream.Initialise(modeSMessage.ExtendedSquitterMessage);
result = new AdsbMessage(modeSMessage);
result.Type = _BitStream.ReadByte(5);
switch (result.Type)
{
case 0: DecodeAirbornePosition(result); break;
case 1:
case 2:
case 3:
case 4: DecodeIdentification(result); break;
case 5:
case 6:
case 7:
case 8: DecodeSurfacePosition(result); break;
case 9:
case 10:
case 11:
case 12:
case 13:
case 14:
case 15:
case 16:
case 17:
case 18: DecodeAirbornePosition(result); break;
case 19: DecodeVelocity(result); break;
case 20:
case 21:
case 22: DecodeAirbornePosition(result); break;
case 28: DecodeAircraftStatus(result); break;
case 29: DecodeTargetStateAndStatus(result); break;
case 31: DecodeAircraftOperationalStatus(result); break;
}
if (_Statistics.Lock != null)
{
lock (_Statistics.Lock) {
++_Statistics.AdsbCount;
++_Statistics.AdsbMessageFormatCount[(int)result.MessageFormat];
++_Statistics.AdsbTypeCount[result.Type];
}
}
}
return(result);
}
/// <summary>
/// See interface docs.
/// </summary>
/// <param name="rawMessage"></param>
/// <param name="start"></param>
/// <returns></returns>
public ModeSMessage Translate(byte[] rawMessage, int start)
{
ModeSMessage result = null;
var messageLength = rawMessage == null ? 0 : rawMessage.Length - start;
if (messageLength > 6)
{
_BitStream.Initialise(rawMessage);
_BitStream.Skip(start * 8);
var downlinkFormatValue = _BitStream.ReadByte(5);
if (downlinkFormatValue >= 24)
{
downlinkFormatValue = 24;
_BitStream.Skip(-3);
}
bool isLongFrame = true;
switch (downlinkFormatValue)
{
case 16:
case 17:
case 18:
case 19:
case 20:
case 21:
case 24: if (messageLength > 13)
{
result = new ModeSMessage();
}
break;
default: isLongFrame = false; result = new ModeSMessage(); break;
}
if (result != null)
{
result.DownlinkFormat = (DownlinkFormat)downlinkFormatValue;
switch (result.DownlinkFormat)
{
case DownlinkFormat.ShortAirToAirSurveillance: DecodeShortAirToAirSurveillance(result); break; // DF0
case DownlinkFormat.SurveillanceAltitudeReply: DecodeSurveillanceAltitudeReply(result); break; // DF4
case DownlinkFormat.SurveillanceIdentityReply: DecodeSurveillanceIdentityReply(result); break; // DF5
case DownlinkFormat.AllCallReply: DecodeAllCallReply(result); break; // DF11
case DownlinkFormat.LongAirToAirSurveillance: DecodeLongAirToAirSurveillance(result); break; // DF16
case DownlinkFormat.ExtendedSquitter: DecodeExtendedSquitter(result); break; // DF17
case DownlinkFormat.ExtendedSquitterNonTransponder: DecodeExtendedSquitterNonTransponder(result); break; // DF18
case DownlinkFormat.MilitaryExtendedSquitter: DecodeMilitaryExtendedSquitter(result); break; // DF19
case DownlinkFormat.CommBAltitudeReply: DecodeCommBAltitudeReply(result); break; // DF20
case DownlinkFormat.CommBIdentityReply: DecodeCommBIdentityReply(result); break; // DF21
case DownlinkFormat.CommD: DecodeCommD(result); break; // DF24
}
if (_Statistics.Lock != null)
{
lock (_Statistics.Lock) {
++_Statistics.ModeSMessagesReceived;
++_Statistics.ModeSDFCount[(int)result.DownlinkFormat];
if (isLongFrame)
{
++_Statistics.ModeSLongFrameMessagesReceived;
}
else
{
++_Statistics.ModeSShortFrameMessagesReceived;
}
}
}
}
}
return(result);
}