public static TreeViewItem ICMPTreeViewItem(IcmpDatagram icmpDatagram)
{
var item = new TreeViewItem()
{
DataContext = icmpDatagram,
HeaderTemplate = (Helpers.GetResourceItem()["icmpItem"] as DataTemplate)
};
item.Items.Add(new TreeViewItem { Header = string.Format("Payload : {0}", icmpDatagram.Payload.ToHexadecimalString()) });
return item;
}
/// <summary>
/// Finalizes the layer data in the buffer.
/// Used for the ICMP checksum.
/// </summary>
/// <param name="buffer">The buffer to finalize the layer in.</param>
/// <param name="offset">The offset in the buffer the layer starts.</param>
/// <param name="payloadLength">The length of the layer's payload (the number of bytes after the layer in the packet).</param>
/// <param name="nextLayer">The layer that comes after this layer. null if this is the last layer.</param>
public sealed override void Finalize(byte[] buffer, int offset, int payloadLength, ILayer nextLayer)
{
IcmpDatagram.WriteChecksum(buffer, offset, Length + payloadLength, Checksum);
}
protected sealed override void Write(byte[] buffer, int offset)
{
IcmpDatagram.WriteHeader(buffer, offset, MessageType, CodeValue, Variable);
WritePayload(buffer, offset + IcmpDatagram.HeaderLength);
}
private ushort CalculateChecksum()
{
return(IcmpDatagram.CalculateChecksum(this.Buffer, this.StartOffset, this.Length));
}
internal static void WriteChecksum(byte[] buffer, int offset, int length, ushort?checksum)
{
ushort?nullable = checksum;
ushort num = !(nullable.HasValue ? new int?((int)nullable.GetValueOrDefault()) : new int?()).HasValue ? IcmpDatagram.CalculateChecksum(buffer, offset, length) : checksum.Value;
ByteArrayExtensions.Write(buffer, offset + 2, num, Endianity.Big);
}
protected override sealed void Write(byte[] buffer, int offset)
{
IcmpDatagram.WriteHeader(buffer, offset, this.MessageType, this.CodeValue, this.Variable);
this.WritePayload(buffer, offset + 8);
}