| /* |
| * Copyright (C) 2010, Google Inc. |
| * and other copyright owners as documented in the project's IP log. |
| * |
| * This program and the accompanying materials are made available |
| * under the terms of the Eclipse Distribution License v1.0 which |
| * accompanies this distribution, is reproduced below, and is |
| * available at http://www.eclipse.org/org/documents/edl-v10.php |
| * |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or |
| * without modification, are permitted provided that the following |
| * conditions are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * - Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer in the documentation and/or other materials provided |
| * with the distribution. |
| * |
| * - Neither the name of the Eclipse Foundation, Inc. nor the |
| * names of its contributors may be used to endorse or promote |
| * products derived from this software without specific prior |
| * written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
| * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
| * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
| * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| package org.eclipse.jgit.pgm.debug; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.util.Collections; |
| import java.util.zip.InflaterInputStream; |
| |
| import org.eclipse.jgit.errors.MissingObjectException; |
| import org.eclipse.jgit.errors.StoredObjectRepresentationNotAvailableException; |
| import org.eclipse.jgit.internal.storage.pack.BinaryDelta; |
| import org.eclipse.jgit.internal.storage.pack.ObjectReuseAsIs; |
| import org.eclipse.jgit.internal.storage.pack.ObjectToPack; |
| import org.eclipse.jgit.internal.storage.pack.PackOutputStream; |
| import org.eclipse.jgit.internal.storage.pack.PackWriter; |
| import org.eclipse.jgit.internal.storage.pack.StoredObjectRepresentation; |
| import org.eclipse.jgit.lib.NullProgressMonitor; |
| import org.eclipse.jgit.lib.ObjectId; |
| import org.eclipse.jgit.lib.ObjectReader; |
| import org.eclipse.jgit.pgm.Command; |
| import org.eclipse.jgit.pgm.TextBuiltin; |
| import org.eclipse.jgit.revwalk.RevObject; |
| import org.eclipse.jgit.revwalk.RevWalk; |
| import org.eclipse.jgit.util.TemporaryBuffer; |
| import org.kohsuke.args4j.Argument; |
| |
| @Command(usage = "usage_ShowPackDelta") |
| class ShowPackDelta extends TextBuiltin { |
| @Argument(index = 0) |
| private ObjectId objectId; |
| |
| @Override |
| protected void run() throws Exception { |
| ObjectReader reader = db.newObjectReader(); |
| RevObject obj = new RevWalk(reader).parseAny(objectId); |
| byte[] delta = getDelta(reader, obj); |
| |
| // We're crossing our fingers that this will be a delta. Double |
| // check the size field in the header, it should match. |
| // |
| long size = reader.getObjectSize(obj, obj.getType()); |
| try { |
| if (BinaryDelta.getResultSize(delta) != size) |
| throw die("Object " + obj.name() + " is not a delta"); |
| } catch (ArrayIndexOutOfBoundsException bad) { |
| throw die("Object " + obj.name() + " is not a delta"); |
| } |
| |
| outw.println(BinaryDelta.format(delta)); |
| } |
| |
| private static byte[] getDelta(ObjectReader reader, RevObject obj) |
| throws IOException, MissingObjectException, |
| StoredObjectRepresentationNotAvailableException { |
| ObjectReuseAsIs asis = (ObjectReuseAsIs) reader; |
| ObjectToPack target = asis.newObjectToPack(obj, obj.getType()); |
| |
| PackWriter pw = new PackWriter(reader) { |
| @Override |
| public void select(ObjectToPack otp, StoredObjectRepresentation next) { |
| otp.select(next); |
| } |
| }; |
| |
| ByteArrayOutputStream buf = new ByteArrayOutputStream(); |
| asis.selectObjectRepresentation(pw, NullProgressMonitor.INSTANCE, |
| Collections.singleton(target)); |
| asis.copyObjectAsIs(new PackOutputStream(NullProgressMonitor.INSTANCE, |
| buf, pw), target, true); |
| |
| // At this point the object header has no delta information, |
| // because it was output as though it were a whole object. |
| // Skip over the header and inflate. |
| // |
| byte[] bufArray = buf.toByteArray(); |
| int ptr = 0; |
| while ((bufArray[ptr] & 0x80) != 0) |
| ptr++; |
| ptr++; |
| |
| @SuppressWarnings("resource" /* java 7 */) |
| TemporaryBuffer.Heap raw = new TemporaryBuffer.Heap(bufArray.length); |
| InflaterInputStream inf = new InflaterInputStream( |
| new ByteArrayInputStream(bufArray, ptr, bufArray.length)); |
| raw.copy(inf); |
| inf.close(); |
| return raw.toByteArray(); |
| } |
| } |