118 lines
3.2 KiB
C#
118 lines
3.2 KiB
C#
|
/*
|
||
|
|
This file is part of PacketDotNet
|
||
|
|
|
||
|
|
PacketDotNet is free software: you can redistribute it and/or modify
|
||
|
|
it under the terms of the GNU Lesser General Public License as published by
|
||
|
|
the Free Software Foundation, either version 3 of the License, or
|
||
|
|
(at your option) any later version.
|
||
|
|
|
||
|
|
PacketDotNet is distributed in the hope that it will be useful,
|
||
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
GNU Lesser General Public License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU Lesser General Public License
|
||
|
|
along with PacketDotNet. If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
*/
|
||
|
|
/*
|
||
|
|
* Copyright 2010 Evan Plaice <evanplaice@gmail.com>
|
||
|
|
*/
|
||
|
|
using System;
|
||
|
|
using PacketDotNet.Utils;
|
||
|
|
|
||
|
|
namespace PacketDotNet.Tcp
|
||
|
|
{
|
||
|
|
/// <summary>
|
||
|
|
/// A TCP Option
|
||
|
|
/// </summary>
|
||
|
|
public abstract class Option
|
||
|
|
{
|
||
|
|
#region Constructors
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Creates an Option from a byte[]
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="bytes">
|
||
|
|
/// A <see cref="System.Byte[]"/>
|
||
|
|
/// </param>
|
||
|
|
/// <param name="offset">
|
||
|
|
/// A <see cref="System.Int32"/>
|
||
|
|
/// </param>
|
||
|
|
/// <param name="length">
|
||
|
|
/// A <see cref="System.Int32"/>
|
||
|
|
/// </param>
|
||
|
|
public Option(byte[] bytes, int offset, int length)
|
||
|
|
{
|
||
|
|
optionData = new ByteArraySegment(bytes, offset, length);
|
||
|
|
}
|
||
|
|
|
||
|
|
#endregion
|
||
|
|
|
||
|
|
#region Properties
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// The Length of the Option type
|
||
|
|
/// </summary>
|
||
|
|
public virtual byte Length
|
||
|
|
{
|
||
|
|
get { return Bytes[LengthFieldOffset]; }
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// The Kind of option
|
||
|
|
/// </summary>
|
||
|
|
public OptionTypes Kind
|
||
|
|
{
|
||
|
|
get { return (OptionTypes)Bytes[KindFieldOffset]; }
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Returns a TLV that contains the Option
|
||
|
|
/// </summary>
|
||
|
|
public byte[] Bytes
|
||
|
|
{
|
||
|
|
get
|
||
|
|
{
|
||
|
|
byte[] bytes = new byte[optionData.Length];
|
||
|
|
Array.Copy(optionData.Bytes, optionData.Offset, bytes, 0, optionData.Length);
|
||
|
|
return bytes;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
#endregion
|
||
|
|
|
||
|
|
#region Methods
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Returns the Option info as a string
|
||
|
|
/// </summary>
|
||
|
|
/// <returns>
|
||
|
|
/// A <see cref="System.String"/>
|
||
|
|
/// </returns>
|
||
|
|
public override string ToString()
|
||
|
|
{
|
||
|
|
return "[" + Kind.ToString() + "]";
|
||
|
|
}
|
||
|
|
|
||
|
|
#endregion
|
||
|
|
|
||
|
|
#region Members
|
||
|
|
|
||
|
|
// stores the data/length/offset of the option
|
||
|
|
private ByteArraySegment optionData;
|
||
|
|
|
||
|
|
/// <summary>The length (in bytes) of the Kind field</summary>
|
||
|
|
internal const int KindFieldLength = 1;
|
||
|
|
|
||
|
|
/// <summary>The length (in bytes) of the Length field</summary>
|
||
|
|
internal const int LengthFieldLength = 1;
|
||
|
|
|
||
|
|
/// <summary>The offset (in bytes) of the Kind Field</summary>
|
||
|
|
internal const int KindFieldOffset = 0;
|
||
|
|
|
||
|
|
/// <summary>The offset (in bytes) of the Length field</summary>
|
||
|
|
internal const int LengthFieldOffset = 1;
|
||
|
|
|
||
|
|
#endregion
|
||
|
|
}
|
||
|
|
}
|