| /* |
| * 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; |
| } |