/// <summary>
/// Constructor
/// </summary>
/// <param name="bas">
/// A <see cref="ByteArraySegment"/>
/// </param>
public IPv4Packet(ByteArraySegment bas)
{
log.Debug("");
header = new ByteArraySegment(bas);
// TOS? See http://en.wikipedia.org/wiki/TCP_offload_engine
if (TotalLength == 0)
{
TotalLength = header.Length;
}
// Check that the TotalLength is valid, at least HeaderMinimumLength long
if (TotalLength < HeaderMinimumLength)
{
throw new System.InvalidOperationException("TotalLength " + TotalLength + " < HeaderMinimumLength " + HeaderMinimumLength);
}
// update the header length with the correct value
// NOTE: we take care to convert from 32bit words into bytes
// NOTE: we do this *after* setting header because we need header to be valid
// before we can retrieve the HeaderLength property
header.Length = HeaderLength * 4;
log.DebugFormat("IPv4Packet HeaderLength {0}", HeaderLength);
log.DebugFormat("header {0}", header);
// parse the payload
var payload = header.EncapsulatedBytes(PayloadLength);
payloadPacketOrData = IpPacket.ParseEncapsulatedBytes(payload,
NextHeader,
this);
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="bas">
/// A <see cref="ByteArraySegment"/>
/// </param>
public IPv6Packet(ByteArraySegment bas)
{
log.Debug(bas.ToString());
// slice off the header
header = new ByteArraySegment(bas);
header.Length = IPv6Packet.HeaderMinimumLength;
// set the actual length, we need to do this because we need to set
// header to something valid above before we can retrieve the PayloadLength
log.DebugFormat("PayloadLength: {0}", PayloadLength);
header.Length = bas.Length - PayloadLength;
// parse the payload
var payload = header.EncapsulatedBytes(PayloadLength);
payloadPacketOrData = IpPacket.ParseEncapsulatedBytes(payload,
NextHeader,
this);
}