public static SectionHeaderBlock Parse(BaseBlock baseBlock, Action <Exception> ActionOnException)
{
Contract.Requires <ArgumentNullException>(baseBlock != null, "BaseBlock cannot be null");
Contract.Requires <ArgumentNullException>(baseBlock.Body != null, "BaseBlock.Body cannot be null");
Contract.Requires <ArgumentException>(baseBlock.BlockType == BaseBlock.Types.SectionHeader, "Invalid packet type");
long positionInStream = baseBlock.PositionInStream;
using (Stream stream = new MemoryStream(baseBlock.Body))
{
using (BinaryReader binaryReader = new BinaryReader(stream))
{
uint tempMagicNumber = binaryReader.ReadUInt32().ReverseByteOrder(baseBlock.ReverseByteOrder);
if (!Enum.IsDefined(typeof(MagicNumbers), tempMagicNumber))
{
throw new ArgumentException(string.Format("[SectionHeaderBlock.Parse] Unrecognized pcapNG magic number: {0}", tempMagicNumber.ToString("x")));
}
MagicNumbers magicNumber = (MagicNumbers)tempMagicNumber;
ushort majorVersion = binaryReader.ReadUInt16().ReverseByteOrder(baseBlock.ReverseByteOrder);
ushort minorVersion = binaryReader.ReadUInt16().ReverseByteOrder(baseBlock.ReverseByteOrder);
long sectionLength = binaryReader.ReadInt64().ReverseByteOrder(baseBlock.ReverseByteOrder);
SectionHeaderOption options = SectionHeaderOption.Parse(binaryReader, baseBlock.ReverseByteOrder, ActionOnException);
SectionHeaderBlock headerBlock = new SectionHeaderBlock(magicNumber, majorVersion, minorVersion, sectionLength, options, positionInStream);
return(headerBlock);
}
}
}
public static SectionHeaderBlock GetEmptyHeader(bool ReverseByteOrder)
{
Assembly assembly = Assembly.GetExecutingAssembly();
AssemblyName assemblyName = assembly.GetName();
string app = string.Format("{0} {1}", assemblyName.Name, assemblyName.Version.ToString());
SectionHeaderOption options = new SectionHeaderOption(UserApplication: app);
return(new SectionHeaderBlock(ReverseByteOrder ? MagicNumbers.Swapped : MagicNumbers.Identical, 1, 0, -1, options));
}
/// <summary>
/// The Section Header Block is mandatory. It identifies the beginning of a section of the capture dump file. The Section Header Block
/// does not contain data but it rather identifies a list of blocks (interfaces, packets) that are logically correlated.
/// </summary>
public SectionHeaderBlock(MagicNumbers MagicNumber, UInt16 MajorVersion, UInt16 MinorVersion, Int64 SectionLength, SectionHeaderOption Options, long PositionInStream = 0)
{
Contract.Requires <ArgumentNullException>(Options != null, "Options cannot be null");
this.MagicNumber = MagicNumber;
this.MajorVersion = MajorVersion;
this.MinorVersion = MinorVersion;
this.SectionLength = SectionLength;
this.options = Options;
this.PositionInStream = PositionInStream;
}
