| /******************************************************************************* |
| * Copyright (c) 2007, 2008 compeople AG and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * compeople AG (Stefan Liebig) - initial API and implementation |
| * IBM Corporation - ongoing development |
| *******************************************************************************/ |
| package org.eclipse.equinox.internal.p2.artifact.optimizers.jbdiff; |
| |
| import ie.wombat.jbdiff.JBDiff; |
| import java.io.ByteArrayInputStream; |
| import java.io.IOException; |
| import org.eclipse.equinox.internal.p2.core.helpers.FileUtils; |
| import org.eclipse.equinox.internal.p2.sar.DirectByteArrayOutputStream; |
| import org.eclipse.equinox.internal.p2.sar.SarUtil; |
| import org.eclipse.equinox.p2.repository.artifact.IArtifactRepository; |
| import org.eclipse.equinox.p2.repository.artifact.spi.ArtifactDescriptor; |
| |
| public class JBDiffZipStep extends JBDiffStep { |
| |
| public JBDiffZipStep() { |
| super(); |
| } |
| |
| // TODO We need a different way of injecting the base artifacts. This approach forces |
| // the target and base to live in the same repo. Typical but not really required. |
| protected JBDiffZipStep(IArtifactRepository repository) { |
| super(repository); |
| } |
| |
| protected void performProcessing() throws IOException { |
| DirectByteArrayOutputStream sarredCurrent = new DirectByteArrayOutputStream(); |
| SarUtil.zipToSar(((DirectByteArrayOutputStream) incomingStream).getInputStream(), sarredCurrent); |
| incomingStream = null; |
| DirectByteArrayOutputStream predecessor = fetchPredecessorBytes(new ArtifactDescriptor(key)); |
| byte[] diff = JBDiff.bsdiff(predecessor.getBuffer(), predecessor.getBufferLength(), sarredCurrent.getBuffer(), sarredCurrent.getBufferLength()); |
| // free up the memory as soon as possible. |
| predecessor = null; |
| incomingStream = null; |
| sarredCurrent = null; |
| |
| // copy the result of the optimization to the destination. |
| FileUtils.copyStream(new ByteArrayInputStream(diff), true, getDestination(), false); |
| } |
| |
| private DirectByteArrayOutputStream fetchPredecessorBytes(ArtifactDescriptor artifactDescriptor) throws IOException { |
| DirectByteArrayOutputStream zippedPredecessor = new DirectByteArrayOutputStream(); |
| |
| setStatus(repository.getArtifact(artifactDescriptor, zippedPredecessor, getProgressMonitor())); |
| if (!getStatus().isOK()) |
| throw (IOException) new IOException(getStatus().getMessage()).initCause(getStatus().getException()); |
| |
| DirectByteArrayOutputStream result = new DirectByteArrayOutputStream(); |
| SarUtil.zipToSar(zippedPredecessor.getInputStream(), result); |
| return result; |
| } |
| |
| } |