/// <summary>
/// (Re)calculates the checksum for any IPv4/ICMP/ICMPv6/TCP/UDP checksum present in the
/// given packet. Individual checksum calculations may be disabled via the appropriate flag.
/// Typically this function should be invoked on a modified packet before it is injected with <seealso cref="WinDivertSend(IntPtr, WinDivertBuffer, uint, ref WinDivertAddress, ref uint)" />.
/// </summary>
/// <param name="packet">
/// The packet to be modified.
/// </param>
/// <param name="packetLength">
/// The total length of the packet pPacket.
/// </param>
/// <param name="flags">
/// One or more <seealso cref="WinDivertChecksumHelperParam" /> flags.
/// </param>
/// <returns>
/// The number of checksums calculated.
/// </returns>
public static uint WinDivertHelperCalcChecksums(WinDivertBuffer packet, uint packetLength, WinDivertChecksumHelperParam flags)
{
return WinDivertNative.WinDivertHelperCalcChecksums(packet.BufferPointer, packetLength, IntPtr.Zero, (ulong)flags);
//fixed (byte* buff = packet._buffer)
{
//return WinDivertNative.WinDivertHelperCalcChecksums(buff, packetLength, IntPtr.Zero, (ulong)flags);
}
}
/// <summary>
/// (Re)calculates the checksum for any IPv4/ICMP/ICMPv6/TCP/UDP checksum present in the
/// given packet. Individual checksum calculations may be disabled via the appropriate flag.
/// Typically this function should be invoked on a modified packet before it is injected with <seealso cref="WinDivertSend(IntPtr, WinDivertBuffer, uint, ref WinDivertAddress, ref uint)" />.
/// </summary>
/// <param name="packet">
/// The packet to be modified.
/// </param>
/// <param name="packetLength">
/// The total length of the packet pPacket.
/// </param>
/// <param name="address">
/// A reference to a <seealso cref="WinDivertAddress" /> structure.
/// </param>
/// <param name="flags">
/// One or more <seealso cref="WinDivertChecksumHelperParam" /> flags.
/// </param>
/// <returns>
/// The number of checksums calculated.
/// </returns>
public static uint WinDivertHelperCalcChecksums(WinDivertBuffer packet, uint packetLength, ref WinDivertAddress address, WinDivertChecksumHelperParam flags)
{
fixed (WinDivertAddress* pAddress = &address)
{
return WinDivertNative.WinDivertHelperCalcChecksums(packet.BufferPointer, packetLength, ref address, (ulong)flags);
}
}
