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- /*
- * Copyright (C) 2008-2009, Google Inc.
- * Copyright (C) 2008, Marek Zawirski <marek.zawirski@gmail.com>
- * Copyright (C) 2007, Robin Rosenberg <robin.rosenberg@dewire.com>
- * Copyright (C) 2006-2008, Shawn O. Pearce <spearce@spearce.org>
- * 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.lib;
-
- import java.io.IOException;
- import java.util.zip.DataFormatException;
-
- import org.eclipse.jgit.errors.CorruptObjectException;
-
- /** Reader for a deltified object stored in a pack file. */
- abstract class DeltaPackedObjectLoader extends PackedObjectLoader {
- private static final int OBJ_COMMIT = Constants.OBJ_COMMIT;
-
- private final int deltaSize;
-
- DeltaPackedObjectLoader(final PackFile pr, final long dataOffset,
- final long objectOffset, final int deltaSz) {
- super(pr, dataOffset, objectOffset);
- objectType = -1;
- deltaSize = deltaSz;
- }
-
- @Override
- public void materialize(final WindowCursor curs) throws IOException {
- if (cachedBytes != null) {
- return;
- }
-
- if (objectType != OBJ_COMMIT) {
- final UnpackedObjectCache.Entry cache = pack.readCache(dataOffset);
- if (cache != null) {
- curs.release();
- objectType = cache.type;
- objectSize = cache.data.length;
- cachedBytes = cache.data;
- return;
- }
- }
-
- try {
- final PackedObjectLoader baseLoader = getBaseLoader(curs);
- baseLoader.materialize(curs);
- cachedBytes = BinaryDelta.apply(baseLoader.getCachedBytes(),
- pack.decompress(dataOffset, deltaSize, curs));
- curs.release();
- objectType = baseLoader.getType();
- objectSize = cachedBytes.length;
- if (objectType != OBJ_COMMIT)
- pack.saveCache(dataOffset, cachedBytes, objectType);
- } catch (DataFormatException dfe) {
- final CorruptObjectException coe;
- coe = new CorruptObjectException("Object at " + dataOffset + " in "
- + pack.getPackFile() + " has bad zlib stream");
- coe.initCause(dfe);
- throw coe;
- }
- }
-
- @Override
- public long getRawSize() {
- return deltaSize;
- }
-
- /**
- * @param curs
- * temporary thread storage during data access.
- * @return the object loader for the base object
- * @throws IOException
- */
- protected abstract PackedObjectLoader getBaseLoader(WindowCursor curs)
- throws IOException;
- }
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