public static EnchantedPacketBlock Parse(BaseBlock baseBlock, Action <Exception> ActionOnException)
{
CustomContract.Requires <ArgumentNullException>(baseBlock != null, "BaseBlock cannot be null");
CustomContract.Requires <ArgumentNullException>(baseBlock.Body != null, "BaseBlock.Body cannot be null");
CustomContract.Requires <ArgumentException>(baseBlock.BlockType == BaseBlock.Types.EnhancedPacket, "Invalid packet type");
long positionInStream = baseBlock.PositionInStream;
using (Stream stream = new MemoryStream(baseBlock.Body))
{
using (BinaryReader binaryReader = new BinaryReader(stream))
{
int interfaceID = binaryReader.ReadInt32().ReverseByteOrder(baseBlock.ReverseByteOrder);
byte[] timestamp = binaryReader.ReadBytes(8);
TimestampHelper timestampHelper = new TimestampHelper(timestamp, baseBlock.ReverseByteOrder);
int capturedLength = binaryReader.ReadInt32().ReverseByteOrder(baseBlock.ReverseByteOrder);
int packetLength = binaryReader.ReadInt32().ReverseByteOrder(baseBlock.ReverseByteOrder);
byte [] data = binaryReader.ReadBytes(capturedLength);
if (data.Length < capturedLength)
{
throw new EndOfStreamException("Unable to read beyond the end of the stream");
}
int remainderLength = (int)capturedLength % BaseBlock.AlignmentBoundary;
if (remainderLength > 0)
{
int paddingLength = BaseBlock.AlignmentBoundary - remainderLength;
binaryReader.ReadBytes(paddingLength);
}
EnchantedPacketOption option = EnchantedPacketOption.Parse(binaryReader, baseBlock.ReverseByteOrder, ActionOnException);
EnchantedPacketBlock enchantedBlock = new EnchantedPacketBlock(interfaceID, timestampHelper, packetLength, data, option, positionInStream);
return(enchantedBlock);
}
}
}
/// <summary>
/// An Enhanced Packet Block is the standard container for storing the packets coming from the network. The Enhanced Packet Block
/// is optional because packets can be stored either by means of this block or the Simple Packet Block, which can be used to speed
/// up dump generation.
/// The Enhanced Packet Block is an improvement over the original Packet Block:
/// it stores the Interface Identifier as a 32bit integer value. This is a requirement when a capture stores packets coming from
/// a large number of interfaces differently from the Packet Block, the number of packets dropped by the capture system between
/// this packet and the previous one is not stored in the header, but rather in an option of the block itself.
/// </summary>
public EnchantedPacketBlock(int InterfaceID, TimestampHelper Timestamp, int PacketLength, byte[] Data, EnchantedPacketOption Options, long PositionInStream = 0)
{
CustomContract.Requires <ArgumentNullException>(Timestamp != null, "Timestamp cannot be null");
CustomContract.Requires <ArgumentNullException>(Options != null, "Options cannot be null");
CustomContract.Requires <ArgumentNullException>(Data != null, "Data cannot be null");
this.InterfaceID = InterfaceID;
this.Timestamp = Timestamp;
this.PacketLength = PacketLength;
this.data = Data;
this.options = Options;
this.PositionInStream = PositionInStream;
}
