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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.storage.file;
-
- import java.io.BufferedInputStream;
- import java.io.File;
- import java.io.FileOutputStream;
- import java.io.IOException;
- import java.io.InputStream;
- import java.util.zip.DataFormatException;
- import java.util.zip.DeflaterOutputStream;
- import java.util.zip.InflaterInputStream;
-
- import org.eclipse.jgit.errors.IncorrectObjectTypeException;
- import org.eclipse.jgit.errors.LargeObjectException;
- import org.eclipse.jgit.errors.MissingObjectException;
- import org.eclipse.jgit.lib.Constants;
- import org.eclipse.jgit.lib.ObjectId;
- import org.eclipse.jgit.lib.ObjectLoader;
- import org.eclipse.jgit.lib.ObjectStream;
- import org.eclipse.jgit.storage.pack.BinaryDelta;
- import org.eclipse.jgit.storage.pack.DeltaStream;
- import org.eclipse.jgit.util.io.TeeInputStream;
-
- class LargePackedDeltaObject extends ObjectLoader {
- private static final long SIZE_UNKNOWN = -1;
-
- private int type;
-
- private long size;
-
- private final long objectOffset;
-
- private final long baseOffset;
-
- private final int headerLength;
-
- private final PackFile pack;
-
- private final FileObjectDatabase db;
-
- LargePackedDeltaObject(long objectOffset,
- long baseOffset, int headerLength, PackFile pack,
- FileObjectDatabase db) {
- this.type = Constants.OBJ_BAD;
- this.size = SIZE_UNKNOWN;
- this.objectOffset = objectOffset;
- this.baseOffset = baseOffset;
- this.headerLength = headerLength;
- this.pack = pack;
- this.db = db;
- }
-
- @Override
- public int getType() {
- if (type == Constants.OBJ_BAD) {
- WindowCursor wc = new WindowCursor(db);
- try {
- type = pack.getObjectType(wc, objectOffset);
- } catch (IOException packGone) {
- // If the pack file cannot be pinned into the cursor, it
- // probably was repacked recently. Go find the object
- // again and get the type from that location instead.
- //
- try {
- type = wc.open(getObjectId()).getType();
- } catch (IOException packGone2) {
- // "He's dead, Jim." We just can't discover the type
- // and the interface isn't supposed to be lazy here.
- // Report an invalid type code instead, callers will
- // wind up bailing out with an error at some point.
- }
- } finally {
- wc.release();
- }
- }
- return type;
- }
-
- @Override
- public long getSize() {
- if (size == SIZE_UNKNOWN) {
- WindowCursor wc = new WindowCursor(db);
- try {
- byte[] b = pack.getDeltaHeader(wc, objectOffset + headerLength);
- size = BinaryDelta.getResultSize(b);
- } catch (DataFormatException objectCorrupt) {
- // The zlib stream for the delta is corrupt. We probably
- // cannot access the object. Keep the size negative and
- // report that bogus result to the caller.
- } catch (IOException packGone) {
- // If the pack file cannot be pinned into the cursor, it
- // probably was repacked recently. Go find the object
- // again and get the size from that location instead.
- //
- try {
- size = wc.open(getObjectId()).getSize();
- } catch (IOException packGone2) {
- // "He's dead, Jim." We just can't discover the size
- // and the interface isn't supposed to be lazy here.
- // Report an invalid type code instead, callers will
- // wind up bailing out with an error at some point.
- }
- } finally {
- wc.release();
- }
- }
- return size;
- }
-
- @Override
- public boolean isLarge() {
- return true;
- }
-
- @Override
- public byte[] getCachedBytes() throws LargeObjectException {
- try {
- throw new LargeObjectException(getObjectId());
- } catch (IOException cannotObtainId) {
- LargeObjectException err = new LargeObjectException();
- err.initCause(cannotObtainId);
- throw err;
- }
- }
-
- @Override
- public ObjectStream openStream() throws MissingObjectException, IOException {
- // If the object was recently unpacked, its available loose.
- // The loose format is going to be faster to access than a
- // delta applied on top of a base. Use that whenever we can.
- //
- final ObjectId myId = getObjectId();
- final WindowCursor wc = new WindowCursor(db);
- ObjectLoader ldr = db.openObject2(wc, myId.name(), myId);
- if (ldr != null)
- return ldr.openStream();
-
- InputStream in = open(wc);
- in = new BufferedInputStream(in, 8192);
-
- // While we inflate the object, also deflate it back as a loose
- // object. This will later be cleaned up by a gc pass, but until
- // then we will reuse the loose form by the above code path.
- //
- int myType = getType();
- long mySize = getSize();
- final ObjectDirectoryInserter odi = db.newInserter();
- final File tmp = odi.newTempFile();
- DeflaterOutputStream dOut = odi.compress(new FileOutputStream(tmp));
- odi.writeHeader(dOut, myType, mySize);
-
- in = new TeeInputStream(in, dOut);
- return new ObjectStream.Filter(myType, mySize, in) {
- @Override
- public void close() throws IOException {
- super.close();
-
- odi.release();
- wc.release();
- db.insertUnpackedObject(tmp, myId, true /* force creation */);
- }
- };
- }
-
- private InputStream open(final WindowCursor wc)
- throws MissingObjectException, IOException,
- IncorrectObjectTypeException {
- InputStream delta;
- try {
- delta = new PackInputStream(pack, objectOffset + headerLength, wc);
- } catch (IOException packGone) {
- // If the pack file cannot be pinned into the cursor, it
- // probably was repacked recently. Go find the object
- // again and open the stream from that location instead.
- //
- return wc.open(getObjectId()).openStream();
- }
- delta = new InflaterInputStream(delta);
-
- final ObjectLoader base = pack.load(wc, baseOffset);
- DeltaStream ds = new DeltaStream(delta) {
- private long baseSize = SIZE_UNKNOWN;
-
- @Override
- protected InputStream openBase() throws IOException {
- InputStream in;
- if (base instanceof LargePackedDeltaObject)
- in = ((LargePackedDeltaObject) base).open(wc);
- else
- in = base.openStream();
- if (baseSize == SIZE_UNKNOWN) {
- if (in instanceof DeltaStream)
- baseSize = ((DeltaStream) in).getSize();
- else if (in instanceof ObjectStream)
- baseSize = ((ObjectStream) in).getSize();
- }
- return in;
- }
-
- @Override
- protected long getBaseSize() throws IOException {
- if (baseSize == SIZE_UNKNOWN) {
- // This code path should never be used as DeltaStream
- // is supposed to open the stream first, which would
- // initialize the size for us directly from the stream.
- baseSize = base.getSize();
- }
- return baseSize;
- }
- };
- if (type == Constants.OBJ_BAD) {
- if (!(base instanceof LargePackedDeltaObject))
- type = base.getType();
- }
- if (size == SIZE_UNKNOWN)
- size = ds.getSize();
- return ds;
- }
-
- private ObjectId getObjectId() throws IOException {
- return pack.findObjectForOffset(objectOffset);
- }
- }
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