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idiolatrie |
/******************************************************************************
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* ETHERLAB - FPGA To C# To LABVIEW Bridge *
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******************************************************************************
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* *
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* Copyright (C)2012 Mathias Hörtnagl *
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* *
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* This program is free software: you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation, either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program. If not, see . *
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******************************************************************************/
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using PcapDotNet.Packets;
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using PcapDotNet.Packets.Ethernet;
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namespace EtherLab
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{
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///
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/// Represents the EtherLab layer for Pcap.NET.
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///
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public sealed class EtherLabLayer : SimpleLayer, IEthernetNextLayer
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{
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///
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/// The version number of the EtherLab protocol.
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///
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public byte Version { set; get; }
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///
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/// The channel number octet. Specifies the virtual channel this
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/// package belongs to.
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///
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public byte Channel { set; get; }
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///
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/// The channel data. 8 channels, 16 bit wide each. Data segment is 40
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/// byte wide as we need at least 42 byte of payload for an Ethernet
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/// package (remaining 2 bytes are EtherLab header).
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///
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public byte[] Data { get; set; }
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///
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/// The default MAC Address value when this layer is the Ethernet payload.
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/// null means there is no default value.
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///
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public MacAddress? PreviousLayerDefaultDestination
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{
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get { return EthernetDatagram.BroadcastAddress; }
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}
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///
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/// The Ethernet Type the Ethernet layer should write when this layer is the Ethernet payload.
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///
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public EthernetType PreviousLayerEtherType
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{
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get { return EthernetType.None; }
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}
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///
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/// The number of bytes this layer will take.
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///
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public override int Length
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{
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get { return EtherLabDatagram.HeaderLength + 16; }
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}
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///
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/// Two EtherLabLayers are always equal. I could not find reasonable
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/// comparison parameters.
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///
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/// An EtherLabLayer instance.
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/// True if the other instance is not null and an instance of EtherLabLayer.
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public override bool Equals(Layer other)
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{
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return other != null && other.GetType() == GetType();
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}
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///
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/// Constructor for a default EtherLab package.
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/// Version 1.
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///
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public EtherLabLayer()
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{
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Version = 1;
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Channel = 0;
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Data = new byte[16];
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}
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///
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/// Writes the layer to the buffer.
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/// This method ignores the payload length, and the previous and next layers.
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///
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/// The buffer to write the layer to.
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/// The offset in the buffer to start writing the layer at.
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protected sealed override void Write(byte[] buffer, int offset)
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{
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EtherLabDatagram.Write(buffer, offset, Version, Channel, Data);
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}
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///
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/// Checks, whether there is new data, that has not yet been sent.
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///
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/// True, if at least one channel holds new data.
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public bool pendingSendData()
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{
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return Channel != 0;
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}
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///
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/// Update channel data and set channel flag. Upon next send, updated
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/// data will be transmitted.
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///
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/// The channel to be updated.
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/// The new data.
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public void update(EChannel channel, ushort channelData)
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{
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int pos = (int)channel;
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Channel |= (byte)(1 << pos);
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Data.Write(2 * pos, channelData, Endianity.Big);
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}
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///
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/// Read data for a channel from current received packet. If no packet
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/// is available yet, this function returns 0.
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///
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/// The channel to be read from.
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/// The current channel data.
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public ushort read(EChannel channel)
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{
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int pos = (int)channel;
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return Data.ReadUShort(2 * pos, Endianity.Big);
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}
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///
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/// Reset channel flags to zero. Clear the flags after a package has
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/// been sent. Only set channel flags trigger an update on hardware
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/// level.
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///
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public void reset()
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{
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Channel = 0;
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}
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}
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}
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