/// <summary>
/// Creates a new instance of this class
/// </summary>
public IPv4Frame()
{
this.iVersion = 4;
this.tosTypeOfService = new IPTypeOfService();
this.iIdentification = 0;
this.ifFlags = new IPFlags(false, false);
this.iFragmentOffset = 0;
this.iTimeToLive = 0xFF;
this.iProtocol = IPProtocol.Other;
this.ipaSource = IPAddress.Any;
this.ipaDestination = IPAddress.Any;
this.ipoOptions = new IPv4Options();
}
/// <summary>
/// Creates a new instance of this class by parsing the given data.
/// </summary>
/// <param name="bRaw">The data to parse</param>
public IPv4Frame(byte[] bRaw)
{
int iHeaderLength;
int iTotalLength;
if (bRaw.Length < 20)
{
throw new ArgumentException("Invalid packet");
}
this.iVersion = (bRaw[0] & 0xF0) >> 4;
iHeaderLength = (bRaw[0] & 0x0F) * 4;
this.iHeaderLength = iHeaderLength;
if (iHeaderLength < 20)
{
throw new ArgumentException("Invalid packet header");
}
this.tosTypeOfService = new IPTypeOfService(bRaw[1]);
iTotalLength = (int)bRaw[2] * 256 + (int)bRaw[3];
if (iTotalLength > bRaw.Length)
{
throw new ArgumentException("Corrupt packet length");
}
this.iIdentification = bRaw[4] * (uint)256 + bRaw[5];
this.ifFlags = new IPFlags((bRaw[6] & 0x40) != 0, ((bRaw[6] & 0x20)) != 0);
this.iFragmentOffset = 0;
this.iFragmentOffset |= (byte)((bRaw[6] & 0x1F) << 8);
this.iFragmentOffset |= (byte)(bRaw[7]);
this.iTimeToLive = bRaw[8];
if (Enum.IsDefined(typeof(IPProtocol), (int)bRaw[9]))
{
this.iProtocol = (IPProtocol)bRaw[9];
}
else
{
this.iProtocol = IPProtocol.Other;
}
ipaSource = new IPAddress(BitConverter.ToUInt32(bRaw, 12));
ipaDestination = new IPAddress(BitConverter.ToUInt32(bRaw, 16));
if (iHeaderLength > 20)
{
byte[] bOptionData = new byte[iHeaderLength - 20];
for (int iC1 = 20; iC1 < iHeaderLength - 20; iC1++)
{
bOptionData[iC1] = bRaw[iC1 + 20];
}
this.ipoOptions = new IPv4Options(bOptionData);
}
else
{
this.ipoOptions = new IPv4Options();
}
Encapsulate(bRaw, iHeaderLength, iTotalLength - iHeaderLength);
}