/*
* $Id$
*
* Copyright (C) 2003-2015 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.driver.net.lance;
import org.jnode.system.resource.MemoryResource;
/**
* @author Chris Cole
*/
public class DescriptorRing {
protected final MemoryResource mem;
protected final int offset;
protected final int length;
protected int currentDescriptor;
public DescriptorRing(MemoryResource mem, int offset, int length) {
this.mem = mem;
this.offset = offset;
this.length = length;
}
public int getSize() {
return length * Descriptor.MESSAGE_DESCRIPTOR_SIZE;
}
public int getLength() {
return length;
}
public int getAddressAs32() {
return mem.getAddress().add(offset).toInt();
}
}