public static PcapPacket GetPacket(BinaryReader readBuffer, LinkLayers LinkLayer)
{
PcapPacket value = new PcapPacket();
byte[] headerbuffer;
byte[] payloadbuffer;
long time;
headerbuffer = new byte[PACKET_HEADER_LENGTH];
if (readBuffer.Read(headerbuffer, 0, PACKET_HEADER_LENGTH) == 0)
{
return(null);
}
uint timeValSecs = BitConverter.ToUInt32(headerbuffer, 0);
uint timeValUsecs = BitConverter.ToUInt32(headerbuffer, 4);
// number of octets stored in packet saved in file
int inclLen = (int)BitConverter.ToUInt32(headerbuffer, 8);
// actual length of packet
uint origLen = BitConverter.ToUInt32(headerbuffer, 12);
time = (long)(timeValSecs * TimeSpan.TicksPerSecond + timeValUsecs * TimeSpan.TicksPerMillisecond * 1.0e-3);
payloadbuffer = new byte[inclLen];
int requestLength = inclLen;
int totalReceived = 0;
int retryCount = 0;
while (requestLength > 0)
{
int resultLength = readBuffer.Read(payloadbuffer, totalReceived, requestLength);
if (requestLength != resultLength)
{
//if it the result is length 0 and we are expecting more try a couple more times
if (resultLength == 0)
{
if (retryCount > 2)
{
return(null);
}
retryCount++;
}
}
requestLength -= resultLength;
totalReceived += resultLength;
}
try
{
value.Packet = PacketDotNet.Packet.ParsePacket(LinkLayer, payloadbuffer);
}
catch (System.ArgumentException ex)
{
throw new Exception("Error parsing packet at " + time, ex);
}
return(value);
}
public PcapPacket GetPacket()
{
return(PcapPacket.GetPacket(_buffer, _pcapHeader.LinkType));
}