/*
* Thresher IRC client library
* Copyright (C) 2002 Aaron Hunter <thresher@sharkbite.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* See the gpl.txt file located in the top-level-directory of
* the archive of this library for complete text of license.
*/
using System;
using System.Net;
using System.Diagnostics;
using System.Globalization;
namespace Sharkbite.Irc{
/// <summary>
/// Utility methods needed to handle DCC requests.
/// </summary>
public sealed class DccUtil
{
internal static TraceSwitch DccTrace = new TraceSwitch("DccTraceSwitch", "Debug level for DCC classes.");
//Should never be called so make it private
private DccUtil(){}
/// <summary>
/// Get the IPAddress object for the local machine.
/// </summary>
/// <returns>An instance of IPAddress.</returns>
public static IPAddress LocalHost()
{
IPHostEntry localhost = Dns.Resolve( Dns.GetHostName() );
return localhost.AddressList[0];
}
/// <summary>
/// Convert a signed long into an unsigned int in
/// network byte order.
/// </summary>
/// <param name="bytesReceived">The number of bytes received as a long.</param>
/// <returns>An unsigned int as a 4 byte array.</returns>
public static byte[] DccBytesReceivedFormat( long bytesReceived )
{
byte[] size = new byte[4];
byte[] longBytes = BitConverter.GetBytes( NetworkUnsignedLong( bytesReceived ) );
Array.Copy( longBytes,0,size,0,4);
return size;
}
/// <summary>
/// Convert the 4 byte current DCC position
/// into a host order long.
/// </summary>
/// <param name="received">The 4 byte unsigned integer.</param>
/// <returns>A long</returns>
public static long DccBytesToLong( byte[] received )
{
return IPAddress.NetworkToHostOrder( BitConverter.ToInt32( received, 0 ) );
}
/// <summary>
/// Convert an IP address into the network order
/// long required by the DCC protocol.
/// </summary>
/// <param name="ipAddress">A valid IP address</param>
/// <returns>The long in string form</returns>
public static string IPAddressToLong( IPAddress ipAddress )
{
if( ipAddress == null )
{
throw new ArgumentException("Address cannot be null");
}
return NetworkUnsignedLong( ipAddress.Address ).ToString( CultureInfo.InvariantCulture );
}
/// <summary>
/// Convert the network order address received from a DCC
/// request into an IP address.
/// </summary>
/// <param name="networkOrder">The address long in string form.</param>
/// <returns>An IpAddress object</returns>
public static IPAddress LongToIPAddress( string networkOrder )
{
if( networkOrder == null || networkOrder.Trim() == "" )
{
throw new ArgumentException("Network order address cannot be null or empty.");
}
try
{
//Johan's routine
byte[] quads = BitConverter.GetBytes( long.Parse( networkOrder, CultureInfo.InvariantCulture ) );
return IPAddress.Parse( quads[3] + "." +quads[2] + "." + quads[1] + "." + quads[0] );
}
catch( FormatException fe )
{
throw new ArgumentException( networkOrder + " is not a valid network address.");
}
}
/// <summary>
/// Convert the spaces in a file name to underscores.
/// </summary>
/// <param name="fileName">The file name.</param>
/// <returns>Underscored string.</returns>
public static string SpacesToUnderscores( string fileName )
{
return fileName.Replace(' ','_');
}
/// <summary>
/// Convert a long into an unsigned 4 byte in in network order
/// </summary>
/// <param name="hostOrderLong">A long in host order</param>
/// <returns>The long as unsigned int in network order</returns>
private static long NetworkUnsignedLong( long hostOrderLong )
{
long networkLong = IPAddress.HostToNetworkOrder( hostOrderLong );
//Network order has the octets in reverse order starting with byte 7
//To get the correct string simply shift them down 4 bytes
//and zero out the first 4 bytes.
return (networkLong >> 32 ) & 0x00000000ffffffff;
}
}
}
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