Descriptor.java example

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jnode-master
/*
 * $Id$
 *
 * 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.apache.log4j.Logger;
import org.jnode.system.resource.MemoryResource;
import org.jnode.util.NumberUtils;

/**
 * @author Chris Cole
 */
public class Descriptor {
    public static final int MESSAGE_DESCRIPTOR_SIZE = 0x10;
    public static final int STATUS = 0x06;
    public static final int STATUS_OWN = 0x8000;
    public static final int STATUS_ERR = 0x4000;
    public static final int STATUS_STP = 0x0200;
    public static final int STATUS_ENP = 0x0100;
    public static final int STATUS_BPE = 0x0080;
    public static final int BCNT = 0x08;

    protected final MemoryResource mem;

    protected final int offset;

    protected final int dataBufferOffset;

    protected byte[] data;

    public Descriptor(MemoryResource mem, int offset, int dataBufferOffset) {

        this.mem = mem;
        this.offset = offset;
        this.dataBufferOffset = dataBufferOffset;

        data = new byte[BufferManager.DATA_BUFFER_SIZE];

        // final int buffAddress =
        // Address.as32bit(Address.addressOfArrayData(data));
        // Set the address
        final int buffAddress = mem.getAddress().add(dataBufferOffset).toInt();
        mem.setInt(offset + 0x00, buffAddress);
        mem.setShort(offset + 0x04, (short) (-BufferManager.DATA_BUFFER_SIZE));
        mem.setShort(offset + STATUS, (short) 0);
        mem.setInt(offset + 0x08, 0);
        mem.setInt(offset + 0x0C, 0);
    }

    public boolean isOwnerSelf() {
        return ((STATUS_OWN & mem.getShort(offset + STATUS)) == 0);
    }

    public void setOwnerSelf(boolean self) {
        if (self) {
            mem.setShort(offset + STATUS, (short) (0x7FFF & mem.getShort(offset + STATUS)));
        } else {
            mem.setShort(offset + STATUS, (short) (STATUS_OWN | mem.getShort(offset + STATUS)));
        }
    }

    public short getStatus() {
        return mem.getShort(offset + STATUS);
    }

    public void setStatus(short status) {
        mem.setShort(offset + STATUS, status);
    }

    public void dumpData(Logger out) {
        for (int i = 0; i <= MESSAGE_DESCRIPTOR_SIZE - 1; i += 4) {
            out.debug("0x" + NumberUtils.hex(mem.getAddress().toInt() + offset + i) + " : 0x" +
                    NumberUtils.hex((byte) i) + " : 0x" + NumberUtils.hex(mem.getInt(offset + i)));
        }
    }
}