private void Initialize(Stream stream, SectionHeader header)
{
CustomContract.Requires <ArgumentNullException>(stream != null, "stream cannot be null");
CustomContract.Requires <Exception>(stream.CanWrite == true, "Cannot write to stream");
CustomContract.Requires <ArgumentNullException>(header != null, "header cannot be null");
this.header = header;
this.stream = stream;
binaryWriter = new BinaryWriter(stream);
binaryWriter.Write(header.ConvertToByte());
}
private void Initialize(Stream stream)
{
CustomContract.Requires <ArgumentNullException>(stream != null, "stream cannot be null");
CustomContract.Requires <Exception>(stream.CanRead == true, "cannot read stream");
this.stream = stream;
binaryReader = new BinaryReader(stream);
Header = SectionHeader.Parse(binaryReader);
BasePosition = binaryReader.BaseStream.Position;
Rewind();
}
public static void SectionHeader_ConvertToByte_Test()
{
SectionHeader pre = SectionHeader.CreateEmptyHeader(false, false);
using (MemoryStream stream = new MemoryStream(pre.ConvertToByte()))
{
using (BinaryReader br = new BinaryReader(stream))
{
SectionHeader post = SectionHeader.Parse(br);
Assert.AreEqual(pre.MagicNumber, post.MagicNumber);
Assert.AreEqual(pre.ReverseByteOrder, post.ReverseByteOrder);
Assert.AreEqual(pre.MajorVersion, post.MajorVersion);
Assert.AreEqual(pre.MinorVersion, post.MinorVersion);
Assert.AreEqual(pre.LinkType, post.LinkType);
Assert.AreEqual(pre.MaximumCaptureLength, post.MaximumCaptureLength);
Assert.AreEqual(pre.NanoSecondResolution, post.NanoSecondResolution);
Assert.AreEqual(pre.SignificantFigures, post.SignificantFigures);
Assert.AreEqual(pre.TimezoneOffset, post.TimezoneOffset);
}
}
}
public static SectionHeader Parse(BinaryReader binaryReader)
{
CustomContract.Requires <ArgumentNullException>(binaryReader != null, "binaryReader cannot be null");
bool reverseByteOrder = false;
long positionInStream = binaryReader.BaseStream.Position;
uint tempMagicNumber = binaryReader.ReadUInt32();
if (!Enum.IsDefined(typeof(MagicNumbers), tempMagicNumber))
{
throw new ArgumentException(string.Format("[SectionHeader.Parse] Unrecognized pcap magic number: {0}", tempMagicNumber.ToString("x")));
}
MagicNumbers magicNumber = (MagicNumbers)tempMagicNumber;
if (magicNumber == MagicNumbers.nanosecondIdentical || magicNumber == MagicNumbers.microsecondIdentical)
{
reverseByteOrder = false;
}
else
{
reverseByteOrder = true;
}
ushort major = binaryReader.ReadUInt16().ReverseByteOrder(reverseByteOrder);
ushort minor = binaryReader.ReadUInt16().ReverseByteOrder(reverseByteOrder);
int thiszone = binaryReader.ReadInt32().ReverseByteOrder(reverseByteOrder);
uint sigfigs = binaryReader.ReadUInt32().ReverseByteOrder(reverseByteOrder);
uint snaplen = binaryReader.ReadUInt32().ReverseByteOrder(reverseByteOrder);
uint linktype = binaryReader.ReadUInt32().ReverseByteOrder(reverseByteOrder);
if (!Enum.IsDefined(typeof(LinkTypes), (ushort)linktype))
{
throw new ArgumentException(string.Format("[SectionHeader.Parse] Invalid LinkTypes: {0}, block begin on position {1} ", linktype, positionInStream));
}
LinkTypes LinkType = (LinkTypes)linktype;
SectionHeader header = new SectionHeader(magicNumber, major, minor, thiszone, sigfigs, snaplen, LinkType);
return(header);
}
