/// <summary>
/// Writes the layer to the buffer.
/// </summary>
/// <param name="buffer">The buffer to write the layer to.</param>
/// <param name="offset">The offset in the buffer to start writing the layer at.</param>
/// <param name="payloadLength">The length of the layer's payload (the number of bytes after the layer in the packet).</param>
/// <param name="previousLayer">The layer that comes before this layer. null if this is the first layer.</param>
/// <param name="nextLayer">The layer that comes after this layer. null if this is the last layer.</param>
public override void Write(byte[] buffer, int offset, int payloadLength, ILayer previousLayer, ILayer nextLayer)
{
EthernetType etherType = GetEthernetType(EtherType, nextLayer);
MacAddress destination = Destination;
IEthernetNextLayer ethernetNextLayer = nextLayer as IEthernetNextLayer;
if (destination == MacAddress.Zero)
{
if (ethernetNextLayer != null && ethernetNextLayer.PreviousLayerDefaultDestination != null)
{
destination = ethernetNextLayer.PreviousLayerDefaultDestination.Value;
}
}
EthernetDatagram.WriteHeader(buffer, offset, Source, destination, etherType);
}
internal static void WriteHeader(byte[] buffer, int offset, MacAddress ethernetSource, MacAddress ethernetDestination, EthernetType ethernetType)
{
buffer.Write(offset + Offset.Source, ethernetSource, Endianity.Big);
buffer.Write(offset + Offset.Destination, ethernetDestination, Endianity.Big);
buffer.Write(offset + Offset.EtherTypeLength, (ushort)ethernetType, Endianity.Big);
}