public override void Parse(byte[] data, uint offset)
{
offset *= 8;
version = BitHelper.Extract4(data, offset + 0);
ihl = BitHelper.Extract4(data, offset + 4);
diffserv = BitHelper.Extract8(data, offset + 8);
totalLen = BitHelper.Extract16(data, offset + 16);
identification = BitHelper.Extract16(data, offset + 32);
flags = BitHelper.ExtractN(data, offset + 48, 3);
fragOffset = BitHelper.ExtractN(data, offset + 51, 13);
ttl = BitHelper.Extract8(data, offset + 64);
protocol = BitHelper.Extract8(data, offset + 72);
hdrChecksum = BitHelper.Extract16(data, offset + 80);
srcAddr = BitHelper.Extract32(data, offset + 96);
dstAddr = BitHelper.Extract32(data, offset + 128);
length = 160;
setValid();
}