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- /*
- * 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();
- }
- }
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