/// <summary>
/// Decodes just the DataSetMetaData Message omitting the DiscoveryResponse Header.
/// </summary>
/// <param name="inputStream"></param>
/// <param name="instance"></param>
/// <returns></returns>
protected static bool DeocdeChunk(Stream inputStream, EncodingOptions options, ref MetaFrame instance)
{
instance.DataSetWriterID = BaseType.ReadUInt16(inputStream)
.Value;
instance.Namespaces = ParseNamespaceArray(inputStream);
instance.StructureDataTypes = ParseStructureDescriptions(inputStream);
// if (instance.StructureDataTypes != null)
// DataPointsManager.UpdateStructureDescription(instance.StructureDataTypes);
instance.EnumDataTypes = ParseEnumDescriptions(inputStream);
// Simple Data Types are currently not supported
int?arrayLength = BaseType.ReadInt32(inputStream);
if (arrayLength > 0)
{
// Simple Data Types are not supported
// ToDo: Log error
return(false);
}
instance.Name = String.Decode(inputStream);
instance.Description = LocalizedText.Decode(inputStream);
instance.FieldMetaDataList = ParseFieldMetaDataArray(inputStream, options);
byte[] guidAsByte = Common.ReadBytes(inputStream, 16);
if (guidAsByte != null && guidAsByte.Length == 16)
{
instance.DataSetClassID = new Guid(guidAsByte);
}
instance.ConfigurationVersion = ConfigurationVersion.Decode(inputStream);
uint?readValue = BaseType.ReadUInt32(inputStream);
if (readValue != null)
{
instance.StatusCode = readValue.Value;
}
else
{
return(false);
}
return(true);
}
public static bool DecodeChunk(Stream inputStream, ref DataFrame instance)
{
// 3. DataSetFlags1
instance.Flags1.RawValue = (byte)inputStream.ReadByte();
// 4. DataSetFlags2
if (instance.Flags1.Flags1.HasFlag(DataSetFlags1Enum.DataSetFlags2Enabled))
{
instance.Flags2.RawValue = (byte)inputStream.ReadByte();
}
// 5. Message Sequence Number
if (instance.Flags1.Flags1.HasFlag(DataSetFlags1Enum.DataSetSequenceNumberEnabled))
{
ushort?sequence = BaseType.ReadUInt16(inputStream);
if (sequence != null)
{
instance.DataSetMessageSequenceNumber = sequence.Value;
}
else
{
// ToDo: Log error
return(false);
}
}
// evaluate the following options only if DataSetFlags2 field is provided
if (instance.Flags1.Flags1.HasFlag(DataSetFlags1Enum.DataSetFlags2Enabled))
{
// Timestamp
if (instance.Flags2.Flags2.HasFlag(DataSetFlags2Enum.TimeStampEnabled))
{
long?timestamp = BaseType.ReadInt64(inputStream);
if (timestamp != null)
{
instance.Timestamp = DateTime.FromFileTimeUtc(timestamp.Value);
//instance.Timestamp = DateTime.FromBinary(timestamp.Value);
}
else
{
// ToDo: Log error
return(false);
}
}
}
// 6. Major & Minor
//
// we always expect both, minor and major version; ensure that both
// bits are set in DataSetFlags1
//
if (instance.Flags1.Flags1.HasFlag(DataSetFlags1Enum.ConfigurationVersionMajorVersion))
{
if (instance.Flags1.Flags1.HasFlag(DataSetFlags1Enum.ConfigurationVersionMinorVersion))
{
// read minor and major version, must both exist
instance.ConfigurationVersion = ConfigurationVersion.Decode(inputStream);
}
else
{
throw new Exception("DataSetMessageHeader: Minor Configuration Version not present.");
}
}
else
{
if (instance.Flags1.Flags1.HasFlag(DataSetFlags1Enum.ConfigurationVersionMinorVersion))
{
throw new Exception("DataSetMessageHeader: Major Configuration Version not present.");
}
}
return(true);
}
