/// <summary>
/// Returns a specific instance e.g. a MetaFrame, Key- or DeltaFrame.
/// </summary>
/// <param name="networkMessageHeader">The NetworkMessageHeader which was already parsed from the input stream.</param>
/// <param name="inputStream">The input stream which should be parsed.</param>
/// <param name="writerID">
/// Optionally the original WriterID. This is only required when a chunked DataFrame is parsed,
/// because it does not contain the real WriterID.
/// </param>
/// <returns>
/// Either a <c>MetaFrame</c>, <c>KeyFrame</c> or <c>DeltaFrame</c> if the message could be parsed successfully or
/// <c>null</c> if the binary message could not be parsed.
/// </returns>
private NetworkMessage GetSpecificMessage(NetworkMessageHeader networkMessageHeader, Stream inputStream, ushort?writerID = null)
{
NetworkMessage parsedMessage = null;
switch (networkMessageHeader.ExtendedFlags2.MessageType)
{
case MessageType.DiscoveryResponse:
Logger.Debug("ParsePayload - Discovery Response");
parsedMessage = ParseMetaFrame(inputStream, networkMessageHeader, Options);
break;
case MessageType.DataSetMessage:
Logger.Debug("ParsePayload - DataSetMessage");
DataFrame dataFrame = null;
if (writerID != null)
{
// If a writeID is present we have a chunked message,
// and we must not try to parse the Header, because there's no
// header in case of a chunked DataSetMessage.
dataFrame = new DataFrame();
if (!DataFrame.DecodeChunk(inputStream, ref dataFrame))
{
Logger.Error($"Unable to decode chunked DataFrame: {dataFrame}.");
return(null);
}
dataFrame.PayloadHeader.DataSetWriterID = new[] { writerID.Value };
}
else
{
dataFrame = DataFrame.Decode(inputStream);
if (dataFrame == null)
{
Logger.Error($"Unable to decode DataFrame: {networkMessageHeader}.");
return(null);
}
}
dataFrame.NetworkMessageHeader = networkMessageHeader;
parsedMessage = ParseDataSetFrame(inputStream, dataFrame);
break;
default:
Logger.Warn($"ParsePayload - Not supported message type: {networkMessageHeader.ExtendedFlags2.MessageType}");
break;
}
return(parsedMessage);
}