public void WriteFrame(PcapPacket frame, bool flush)
{
lock (this)
{
TimeSpan delta = frame.Timestamp.Subtract(this.referenceTime);
//The smallest unit of time is the tick, which is equal to 100 nanoseconds. A tick can be negative or positive.
long totalMicroseconds = delta.Ticks / 10;
uint seconds = (uint)(totalMicroseconds / 1000000);
uint microseconds = (uint)(totalMicroseconds % 1000000);
byte[] headerData = ToByteArray(frame.Header);
fileStream.Write(ToByteArray(seconds), 0, 4);
fileStream.Write(ToByteArray(microseconds), 0, 4);
//number of octets of packet saved in file
fileStream.Write(ToByteArray((uint)frame.Data.Length + headerData.Length), 0, 4);
//actual length of packet
fileStream.Write(ToByteArray((uint)frame.Data.Length + headerData.Length), 0, 4);
//data
fileStream.Write(headerData, 0, headerData.Length);
fileStream.Write(frame.Data, 0, frame.Data.Length);
if (flush)
{
fileStream.Flush();
}
}
}
void backgroundFileReader_DoWork(object sender, System.ComponentModel.DoWorkEventArgs e)
{
DateTime firstFrameTimestamp = DateTime.MinValue;
DateTime lastFrameTimestamp = DateTime.MinValue;
int framesCount = 0;
try
{
while (!this.backgroundFileReader.CancellationPending && fileStream.Position + 1 < fileStream.Length)
{
if (this.packetQueue.Count < this.packetQueueSize)
{
PcapPacket packet = ReadPcapPacket();
if (firstFrameTimestamp == DateTime.MinValue)
{
firstFrameTimestamp = packet.Timestamp;
}
lastFrameTimestamp = packet.Timestamp;
framesCount++;
lock (this.packetQueue)
{
this.packetQueue.Enqueue(packet);
}
this.enqueuedByteCount += packet.Data.Length;
}
else
{
System.Threading.Thread.Sleep(20);
}
}
}
catch (Exception ex)
{
e.Cancel = true;
e.Result = ex.Message;
this.AbortFileRead();
}
//do a callback with this.filename as well as first and last timestamp
if (this.readCompletedCallback != null && firstFrameTimestamp != DateTime.MinValue && lastFrameTimestamp != DateTime.MinValue)
{
this.readCompletedCallback(this.filename, framesCount, firstFrameTimestamp, lastFrameTimestamp);
}
}
public void WriteFrame(PcapPacket frame)
{
WriteFrame(frame, false);
}