public static void Set(
ref UDPHeader header,
IPv4Address sourceAddress,
ushort sourcePort,
IPv4Address desAddress,
ushort desPort,
Span <byte> headerAndData)
{
header = new UDPHeader();
header._SourcePort = Meth.AsBigEndian(sourcePort);
header._DesPort = Meth.AsBigEndian(desPort);
header._Length = Meth.AsBigEndian((ushort)headerAndData.Length);
var per = new PseudoHeader(
sourceAddress,
desAddress,
Protocol.UDP,
(ushort)headerAndData.Length);
header._Sum = Meth.AsBigEndian(Meth.CalculationHeaderChecksum(per, headerAndData));
}
public static ushort CalculationHeaderChecksum(PseudoHeader pseudoHeader, Span <byte> buffer)
{
uint sum = AddStructSum(ref pseudoHeader);
sum += AddSpanBytesSum(buffer);
return(AsSum(sum));
}
public static void Set(
ref TCPHeader header,
IPv4Address sourceAddress,
ushort sourcePort,
IPv4Address desAddress,
ushort desPort,
TCPFlag tcpFlag,
ushort windowSize,
uint sequenceNumber,
uint acknowledgmentNumber,
Span <byte> headerAndData)
{
header = new TCPHeader();
header._SourcePort = Meth.AsBigEndian(sourcePort);
header._DesPort = Meth.AsBigEndian(desPort);
header._SequenceNumber = Meth.AsBigEndian(sequenceNumber);
header._AcknowledgmentNumber = Meth.AsBigEndian(acknowledgmentNumber);
header._WindowSize = Meth.AsBigEndian(windowSize);
header._TCPHeader12_14._Byte_0 = (byte)(5 << 4);
header._TCPHeader12_14._Byte_1 = (byte)tcpFlag;
var ph = new PseudoHeader(
sourceAddress,
desAddress,
Protocol.TCP,
(ushort)headerAndData.Length);
header._Checksum = Meth.AsBigEndian(Meth.CalculationHeaderChecksum(ph, headerAndData));
}