122 lines
3.7 KiB
C#
122 lines
3.7 KiB
C#
/*
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This file is part of PacketDotNet
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PacketDotNet is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser 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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PacketDotNet 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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with PacketDotNet. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* Copyright 2010 Evan Plaice <evanplaice@gmail.com>
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* Copyright 2010 Chris Morgan <chmorgan@gmail.com>
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*/
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using System;
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using PacketDotNet.Utils;
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namespace PacketDotNet.LLDP
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{
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/// <summary>
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/// Base class for several TLV types that all contain strings
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/// </summary>
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public class StringTLV : TLV
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{
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#region Constructors
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/// <summary>
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/// Creates a String TLV
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/// </summary>
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/// <param name="bytes">
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/// </param>
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/// <param name="offset">
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/// The Port Description TLV's offset from the
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/// origin of the LLDP
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/// </param>
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public StringTLV(byte[] bytes, int offset) :
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base(bytes, offset)
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{}
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/// <summary>
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/// Create from a type and string value
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/// </summary>
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/// <param name="tlvType">
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/// A <see cref="TLVTypes"/>
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/// </param>
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/// <param name="StringValue">
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/// A <see cref="System.String"/>
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/// </param>
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public StringTLV(TLVTypes tlvType, string StringValue)
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{
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var bytes = new byte[TLVTypeLength.TypeLengthLength];
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var offset = 0;
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tlvData = new ByteArraySegment(bytes, offset, bytes.Length);
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Type = tlvType;
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this.StringValue = StringValue;
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}
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#endregion
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#region Properties
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/// <value>
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/// A textual Description of the port
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/// </value>
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public string StringValue
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{
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get
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{
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return System.Text.ASCIIEncoding.ASCII.GetString(tlvData.Bytes,
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ValueOffset,
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Length);
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}
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set
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{
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var bytes = System.Text.ASCIIEncoding.ASCII.GetBytes(value);
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var length = TLVTypeLength.TypeLengthLength + bytes.Length;
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// is the tlv the correct size?
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if(tlvData.Length != length)
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{
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// allocate new memory for this tlv
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var newTLVBytes = new byte[length];
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var offset = 0;
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// copy header over
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Array.Copy(tlvData.Bytes, tlvData.Offset,
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newTLVBytes, 0,
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TLVTypeLength.TypeLengthLength);
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tlvData = new ByteArraySegment(newTLVBytes, offset, length);
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}
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// set the description
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Array.Copy(bytes, 0,
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tlvData.Bytes, ValueOffset,
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bytes.Length);
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}
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}
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/// <summary>
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/// Convert this Port Description TLV to a string.
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/// </summary>
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/// <returns>
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/// A human readable string
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/// </returns>
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public override string ToString ()
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{
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return string.Format("[{0}: Description={0}]", Type, StringValue);
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}
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#endregion
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}
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}
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