public override void Write(byte[] buffer, int offset, int payloadLength, ILayer previousLayer, ILayer nextLayer)
{
EthernetType ethernetType = EthernetBaseLayer.GetEthernetType(this.EtherType, nextLayer);
MacAddress destination = this.Destination;
IEthernetNextLayer ethernetNextLayer = nextLayer as IEthernetNextLayer;
if (destination == MacAddress.Zero && ethernetNextLayer != null && ethernetNextLayer.PreviousLayerDefaultDestination.HasValue)
{
destination = ethernetNextLayer.PreviousLayerDefaultDestination.Value;
}
EthernetDatagram.WriteHeader(buffer, offset, this.Source, destination, ethernetType);
}
internal static EthernetType GetEthernetType(EthernetType ethernetType, ILayer nextLayer)
{
if (ethernetType != EthernetType.None)
{
return(ethernetType);
}
if (nextLayer == null)
{
throw new ArgumentException("Can't determine ether type automatically from next layer because there is not next layer");
}
IEthernetNextLayer ethernetNextLayer = nextLayer as IEthernetNextLayer;
if (ethernetNextLayer == null)
{
throw new ArgumentException("Can't determine ether type automatically from next layer (" + (object)nextLayer.GetType() + ")");
}
return(ethernetNextLayer.PreviousLayerEtherType);
}
public override void Write(byte[] buffer, int offset, int payloadLength, ILayer previousLayer, ILayer nextLayer)
{
EthernetType protocolType = this.ProtocolType;
if (protocolType == EthernetType.None)
{
if (nextLayer == null)
{
throw new ArgumentException("Can't determine protocol type automatically from next layer because there is not next layer");
}
IEthernetNextLayer ethernetNextLayer = nextLayer as IEthernetNextLayer;
if (ethernetNextLayer == null)
{
throw new ArgumentException("Can't determine protocol type automatically from next layer (" + (object)nextLayer.GetType() + ")");
}
protocolType = ethernetNextLayer.PreviousLayerEtherType;
}
GreDatagram.WriteHeader(buffer, offset, this.RecursionControl, this.FutureUseBits, this.Version, protocolType, this.ChecksumPresent, this.Key, this.SequenceNumber, this.AcknowledgmentSequenceNumber, this.Routing, this.RoutingOffset, this.StrictSourceRoute);
}
