public IPHeader(byte[] byBuffer, int nReceived)
{
NetBinaryReader nbr = new NetBinaryReader(byBuffer, 0, nReceived);
Version = nbr.ReadNible();
HeaderLength = nbr.ReadNible();
Precedence = (Precedence)nbr.ReadCustomAmount(3);
LowDelay = nbr.ReadBit();
HighThroughput = nbr.ReadBit();
HighRelibility = nbr.ReadBit();
nbr.SkipPadBits();
TotalLength = nbr.ReadUInt16();
Identification = nbr.ReadUInt16();
nbr.ReadBit();
MayFragment = !nbr.ReadBit();
LastFragment = !nbr.ReadBit();
FragmentOffset = (nbr.ReadPadBits() << 3) + nbr.ReadByte();
TTL = nbr.ReadByte();
Protocol = (ProtocolType)nbr.ReadByte();
HeaderChecksum = IPAddress.NetworkToHostOrder(nbr.ReadInt16());
Source = new IPAddress(nbr.ReadBytes(4));
Destination = new IPAddress(nbr.ReadBytes(4));
}
public TcpHeader(byte[] byIpData, int start)
{
NetBinaryReader nbr = new NetBinaryReader(byIpData, start);
SourcePort = nbr.ReadUInt16();
DestinationPort = nbr.ReadUInt16();
SequenceNumber = nbr.ReadUInt32();
AcknowledgmentNumber = nbr.ReadUInt32();
DataOffset = nbr.ReadNible();
nbr.SkipPadBits();
nbr.ReadCustomAmount(2);
URG = nbr.ReadBit();
ACK = nbr.ReadBit();
PSH = nbr.ReadBit();
RST = nbr.ReadBit();
SYN = nbr.ReadBit();
FIN = nbr.ReadBit();
Window = nbr.ReadUInt16();
Checksum = nbr.ReadUInt16();
UrgentPointer = nbr.ReadUInt16();
//TODO: test
byte option;
long optionsStart = nbr.BaseStream.Position;
Options = new byte[0][];
while ((option = nbr.ReadByte()) != 0 || nbr.BaseStream.Position > start + DataOffset) // 0 = End list
{
if (option == 1) continue; // 1 = No Option
if (option == 2) // Max Segm size
{
byte length = nbr.ReadByte();
byte[] cur = new byte[length];
for (byte i = 0; i < length; i++)
{
cur[i] = nbr.ReadByte();
}
Array.Resize(ref Options, Options.Length + 1);
Options[Options.Length - 1] = cur;
}
}
long dataLength = DataOffset - optionsStart;
Data = new byte[dataLength];
for (int i = 0; i < dataLength; i++)
{
Data[i] = nbr.ReadByte();
}
}
public DnsHeader(byte[] byIpData, int start, int bytesReceived)
{
NetBinaryReader nbr = new NetBinaryReader(byIpData, start);
Indentifier = nbr.ReadUInt16();
QueryOrResponseFlag = nbr.ReadBit();
OperationCode = (OpCode)nbr.ReadNible();
AuthoritativeAnswer = nbr.ReadBit();
Turncation = nbr.ReadBit();
RecursionDesired = nbr.ReadBit();
RecursionAvailable = nbr.ReadBit();
nbr.ReadCustomAmount(3);
ResponseCode = (RCode)nbr.ReadNible();
QuestionCount = nbr.ReadUInt16();
AnswerCount = nbr.ReadUInt16();
AuthorityCount = nbr.ReadUInt16();
AdditionalCount = nbr.ReadUInt16();
data = new byte[bytesReceived - start - OCTET_COUNT];
Array.Copy(byIpData, start + OCTET_COUNT, data, 0, data.Length);
}
