118 lines
3.2 KiB
C#
118 lines
3.2 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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*/
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using System;
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using PacketDotNet.Utils;
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namespace PacketDotNet.Tcp
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{
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/// <summary>
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/// A TCP Option
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/// </summary>
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public abstract class Option
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{
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#region Constructors
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/// <summary>
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/// Creates an Option from a byte[]
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/// </summary>
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/// <param name="bytes">
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/// A <see cref="System.Byte[]"/>
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/// </param>
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/// <param name="offset">
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/// A <see cref="System.Int32"/>
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/// </param>
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/// <param name="length">
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/// A <see cref="System.Int32"/>
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/// </param>
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public Option(byte[] bytes, int offset, int length)
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{
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optionData = new ByteArraySegment(bytes, offset, length);
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}
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#endregion
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#region Properties
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/// <summary>
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/// The Length of the Option type
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/// </summary>
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public virtual byte Length
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{
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get { return Bytes[LengthFieldOffset]; }
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}
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/// <summary>
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/// The Kind of option
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/// </summary>
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public OptionTypes Kind
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{
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get { return (OptionTypes)Bytes[KindFieldOffset]; }
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}
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/// <summary>
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/// Returns a TLV that contains the Option
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/// </summary>
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public byte[] Bytes
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{
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get
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{
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byte[] bytes = new byte[optionData.Length];
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Array.Copy(optionData.Bytes, optionData.Offset, bytes, 0, optionData.Length);
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return bytes;
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}
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}
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#endregion
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#region Methods
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/// <summary>
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/// Returns the Option info as a string
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/// </summary>
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/// <returns>
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/// A <see cref="System.String"/>
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/// </returns>
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public override string ToString()
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{
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return "[" + Kind.ToString() + "]";
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}
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#endregion
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#region Members
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// stores the data/length/offset of the option
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private ByteArraySegment optionData;
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/// <summary>The length (in bytes) of the Kind field</summary>
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internal const int KindFieldLength = 1;
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/// <summary>The length (in bytes) of the Length field</summary>
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internal const int LengthFieldLength = 1;
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/// <summary>The offset (in bytes) of the Kind Field</summary>
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internal const int KindFieldOffset = 0;
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/// <summary>The offset (in bytes) of the Length field</summary>
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internal const int LengthFieldOffset = 1;
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#endregion
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}
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} |