/// <summary>
/// Init TCPPacket fields.
/// </summary>
/// <exception cref="sys.ArgumentException">Thrown if RawData is invalid or null.</exception>
protected override void InitFields()
{
base.InitFields();
SourcePort = (ushort)((RawData[DataOffset] << 8) | RawData[DataOffset + 1]);
DestinationPort = (ushort)((RawData[DataOffset + 2] << 8) | RawData[DataOffset + 3]);
SequenceNumber = (uint)((RawData[DataOffset + 4] << 24) | (RawData[DataOffset + 5] << 16) | (RawData[DataOffset + 6] << 8) | RawData[DataOffset + 7]);
AckNumber = (uint)((RawData[DataOffset + 8] << 24) | (RawData[DataOffset + 9] << 16) | (RawData[DataOffset + 10] << 8) | RawData[DataOffset + 11]);
TCPHeaderLength = (byte)((RawData[DataOffset + 12] >> 4) * 4);
TCPFlags = RawData[DataOffset + 13];
WindowSize = (ushort)((RawData[DataOffset + 14] << 8) | RawData[DataOffset + 15]);
Checksum = (ushort)((RawData[DataOffset + 16] << 8) | RawData[DataOffset + 17]);
UrgentPointer = (ushort)((RawData[DataOffset + 18] << 8) | RawData[DataOffset + 19]);
SYN = (RawData[47] & (byte)Flags.SYN) != 0;
ACK = (RawData[47] & (byte)Flags.ACK) != 0;
FIN = (RawData[47] & (byte)Flags.FIN) != 0;
PSH = (RawData[47] & (byte)Flags.PSH) != 0;
RST = (RawData[47] & (byte)Flags.RST) != 0;
URG = (RawData[47] & (byte)Flags.URG) != 0;
if (TCPHeaderLength > 20) //options
{
Options = new List <TCPOption>();
for (int i = 0; i < TCP_DataLength; i++)
{
var option = new TCPOption();
option.Kind = RawData[DataOffset + 20 + i];
if (option.Kind != 1) //NOP
{
option.Length = RawData[DataOffset + 20 + i + 1];
if (option.Length != 2)
{
option.Data = new byte[option.Length - 2];
for (int j = 0; j < option.Length - 2; j++)
{
option.Data[j] = RawData[DataOffset + 20 + i + 2 + j];
}
}
Options.Add(option);
i += option.Length - 1;
}
}
}
}
/// <summary>
/// Add Option to TCP Packet.
/// </summary>
/// <param name="option">TCP Option.</param>
/// <exception cref="ArgumentException">Thrown if RawData is invalid or null.</exception>
internal void AddOption(TCPOption option)
{
throw new NotImplementedException();
}