/*
* $Id$
*
* 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.apps.vmware.disk.handler.sparse;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import org.apache.log4j.Logger;
import org.jnode.apps.vmware.disk.ExtentDeclaration;
import org.jnode.apps.vmware.disk.IOUtils;
import org.jnode.apps.vmware.disk.descriptor.Descriptor;
import org.jnode.apps.vmware.disk.descriptor.DescriptorRW;
import org.jnode.apps.vmware.disk.handler.FileDescriptor;
import org.jnode.apps.vmware.disk.handler.UnsupportedFormatException;
/**
* Wrote from the 'Virtual Disk Format 1.0' specifications (from VMWare).
*
* @author Fabien DUMINY (fduminy at jnode dot org)
*
*/
final class SparseDescriptorRW extends DescriptorRW {
static final Logger LOG = Logger.getLogger(SparseDescriptorRW.class);
@Override
public SparseExtent createMainExtent(Descriptor desc, ExtentDeclaration extentDecl)
throws IOException, UnsupportedFormatException {
SparseExtentFactory factory = new SparseExtentFactory();
RandomAccessFile raf = new RandomAccessFile(extentDecl.getExtentFile(), "rw");
ByteBuffer bb = IOUtils.getByteBuffer(raf, 1024);
SparseExtentHeaderRW reader = new SparseExtentHeaderRW();
SparseExtentHeader header = reader.read(bb);
SparseFileDescriptor sfd = new SparseFileDescriptor(desc, raf, factory, header);
return createExtent(sfd, extentDecl);
}
@Override
public SparseExtent createExtent(FileDescriptor fileDescriptor, ExtentDeclaration extentDecl)
throws IOException, UnsupportedFormatException {
SparseFileDescriptor sfd = (SparseFileDescriptor) fileDescriptor;
return new SparseExtentRW().read(sfd.getRandomAccessFile().getChannel(), sfd, extentDecl);
}
}