public void Performance()
{
captureFilename = capturePre + captureFN;
// open the offline file
var dev = new CaptureFileReaderDevice(captureFilename);
dev.Open();
Assert.True(dev != null, "failed to open " + captureFilename);
TcpStream tcpStream = new TcpStream();
int i = 1; // to match the packet numbering in wireshark
RawCapture rawCapture;
const int packetsToAppend = 100000;
while ((rawCapture = dev.GetNextPacket()) != null)
{
var p = Packet.ParsePacket(rawCapture.LinkLayerType, rawCapture.Data);
var tcpPacket = p.Extract <TcpPacket>();
for (int x = 0; x < packetsToAppend; x++)
{
tcpStream.AppendPacket(tcpPacket);
// advance to the next packet
tcpStream.AdvanceToNextPacket();
tcpStream = tcpStream.TrimUnusedPackets();
}
i++;
}
dev.Close();
}
public void TestAdvanceToNextPacketandTrimUnusedPackets()
{
captureFilename = capturePre + captureFN;
// open the offline file
var dev = new CaptureFileReaderDevice(captureFilename);
dev.Open();
Assert.True(dev != null, "failed to open " + captureFilename);
TcpStream tcpStream = new TcpStream();
int i = 1; // to match the packet numbering in wireshark
PacketCapture e;
GetPacketStatus status;
while ((status = dev.GetNextPacket(out e)) == GetPacketStatus.PacketRead)
{
var rawCapture = e.GetPacket();
var p = Packet.ParsePacket(rawCapture.LinkLayerType, rawCapture.Data);
var tcpPacket = p.Extract <TcpPacket>();
tcpStream.AppendPacket(tcpPacket);
i++;
}
dev.Close();
long expected_position;
// verify our position is 0
expected_position = 0;
Assert.Equal(expected_position, tcpStream.Position);
// advance to the next packet
tcpStream.AdvanceToNextPacket();
// is our current position correct
expected_position = 38;
Assert.Equal(expected_position, tcpStream.Position);
// test that if we advance to the next packet and no packet is available that
// we will end up at the end of the stream
tcpStream.AdvanceToNextPacket();
Assert.True(tcpStream.Position == tcpStream.Length, "stream position and length don't match");
// now trim any unused packets
tcpStream = tcpStream.TrimUnusedPackets();
}
