public static SimplePacketBlock 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.SimplePacket, "Invalid packet type"); long positionInStream = baseBlock.PositionInStream; using (Stream stream = new MemoryStream(baseBlock.Body)) { using (BinaryReader binaryReader = new BinaryReader(stream)) { int packetLength = binaryReader.ReadInt32().ReverseByteOrder(baseBlock.ReverseByteOrder); byte[] data = binaryReader.ReadBytes(packetLength); if (data.Length < packetLength) { throw new EndOfStreamException("Unable to read beyond the end of the stream"); } int remainderLength = packetLength % BaseBlock.AlignmentBoundary; if (remainderLength > 0) { int paddingLength = BaseBlock.AlignmentBoundary - remainderLength; binaryReader.ReadBytes(paddingLength); } SimplePacketBlock simplePacketBlock = new SimplePacketBlock(data, positionInStream); return(simplePacketBlock); } } }
public static void AbstractBlockFactory_ConvertTo_SimplePacketBlock_Test() { byte[] byteblock = { 3, 0, 0, 0, 139, 0, 0, 0, 123, 0, 0, 0, 104, 83, 17, 243, 59, 0, 0, 0, 151, 143, 0, 243, 59, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 208, 241, 255, 191, 127, 0, 0, 0, 208, 79, 17, 243, 59, 0, 0, 0, 96, 5, 0, 243, 59, 0, 0, 0, 252, 6, 0, 243, 59, 0, 0, 0, 96, 2, 0, 243, 59, 0, 0, 0, 88, 6, 64, 0, 0, 0, 0, 0, 104, 83, 17, 243, 59, 0, 0, 0, 104, 83, 17, 243, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 139, 0, 0, 0 }; using (MemoryStream stream = new MemoryStream(byteblock)) { using (BinaryReader binaryReader = new BinaryReader(stream)) { AbstractBlock block = AbstractBlockFactory.ReadNextBlock(binaryReader, false, null); Assert.IsNotNull(block); SimplePacketBlock packetBlock = block as SimplePacketBlock; Assert.IsNotNull(packetBlock); Assert.AreEqual(packetBlock.PacketLength, 123); } } }
public static AbstractBlock ReadNextBlock(BinaryReader binaryReader, bool bytesReorder, Action <Exception> ActionOnException) { CustomContract.Requires <ArgumentNullException>(binaryReader != null, "binaryReader cannot be null"); try { BaseBlock baseblock = new BaseBlock(binaryReader, bytesReorder); AbstractBlock block = null;; switch (baseblock.BlockType) { case BaseBlock.Types.SectionHeader: block = SectionHeaderBlock.Parse(baseblock, ActionOnException); break; case BaseBlock.Types.InterfaceDescription: block = InterfaceDescriptionBlock.Parse(baseblock, ActionOnException); break; case BaseBlock.Types.Packet: block = PacketBlock.Parse(baseblock, ActionOnException); break; case BaseBlock.Types.SimplePacket: block = SimplePacketBlock.Parse(baseblock, ActionOnException); break; case BaseBlock.Types.NameResolution: block = NameResolutionBlock.Parse(baseblock, ActionOnException); break; case BaseBlock.Types.InterfaceStatistics: block = InterfaceStatisticsBlock.Parse(baseblock, ActionOnException); break; case BaseBlock.Types.EnhancedPacket: block = EnhancedPacketBlock.Parse(baseblock, ActionOnException); break; default: break; } return(block); } catch (Exception exc) { ActionOnException(exc); return(null); } }