/*
* $Id$
*
* Copyright (C) 2003-2014 JNode.org
*
* This library 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 2.1 of the License, or
* (at your option) any later version.
*
* This library 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 this library; If not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package org.jnode.test.net;
import org.jnode.net.SocketBuffer;
import org.jnode.net.ipv4.IPv4Utils;
import org.jnode.util.NumberUtils;
/**
* @author epr
*/
public class ChecksumTest {
public static void main(String[] args) {
SocketBuffer skbuf = new SocketBuffer();
skbuf.insert(20);
for (int i = 0; i < 20; i++) {
skbuf.set(i, i);
}
skbuf.set16(10, 0);
final int ccs = IPv4Utils.calcChecksum(skbuf, 0, 20);
skbuf.set16(10, ccs);
final int ccs2 = IPv4Utils.calcChecksum(skbuf, 0, 20);
System.out.println("ccs=0x" + NumberUtils.hex(ccs) + ", ccs2=0x" + NumberUtils.hex(ccs2));
}
}