| /* |
| * 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); |
| } |
| } |