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/*
* 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.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.zip.DataFormatException;
import java.util.zip.Inflater;
import org.eclipse.jgit.JGitText;
import org.eclipse.jgit.errors.CorruptObjectException;
import org.eclipse.jgit.util.IO;
import org.eclipse.jgit.util.MutableInteger;
import org.eclipse.jgit.util.RawParseUtils;
/**
* Loose object loader. This class loads an object not stored in a pack.
*/
public class UnpackedObjectLoader extends ObjectLoader {
private final int objectType;
private final int objectSize;
private final byte[] bytes;
/**
* Construct an ObjectLoader to read from the file.
*
* @param path
* location of the loose object to read.
* @param id
* expected identity of the object being loaded, if known.
* @throws FileNotFoundException
* the loose object file does not exist.
* @throws IOException
* the loose object file exists, but is corrupt.
*/
public UnpackedObjectLoader(final File path, final AnyObjectId id)
throws IOException {
this(IO.readFully(path), id);
}
/**
* Construct an ObjectLoader from a loose object's compressed form.
*
* @param compressed
* entire content of the loose object file.
* @throws CorruptObjectException
* The compressed data supplied does not match the format for a
* valid loose object.
*/
public UnpackedObjectLoader(final byte[] compressed)
throws CorruptObjectException {
this(compressed, null);
}
private UnpackedObjectLoader(final byte[] compressed, final AnyObjectId id)
throws CorruptObjectException {
// Try to determine if this is a legacy format loose object or
// a new style loose object. The legacy format was completely
// compressed with zlib so the first byte must be 0x78 (15-bit
// window size, deflated) and the first 16 bit word must be
// evenly divisible by 31. Otherwise its a new style loose
// object.
//
final Inflater inflater = InflaterCache.get();
try {
final int fb = compressed[0] & 0xff;
if (fb == 0x78 && (((fb << 8) | compressed[1] & 0xff) % 31) == 0) {
inflater.setInput(compressed);
final byte[] hdr = new byte[64];
int avail = 0;
while (!inflater.finished() && avail < hdr.length)
try {
int uncompressed = inflater.inflate(hdr, avail,
hdr.length - avail);
if (uncompressed == 0) {
throw new CorruptObjectException(id,
JGitText.get().corruptObjectBadStreamCorruptHeader);
}
avail += uncompressed;
} catch (DataFormatException dfe) {
final CorruptObjectException coe;
coe = new CorruptObjectException(id, JGitText.get().corruptObjectBadStream);
coe.initCause(dfe);
throw coe;
}
if (avail < 5)
throw new CorruptObjectException(id, JGitText.get().corruptObjectNoHeader);
final MutableInteger p = new MutableInteger();
objectType = Constants.decodeTypeString(id, hdr, (byte) ' ', p);
objectSize = RawParseUtils.parseBase10(hdr, p.value, p);
if (objectSize < 0)
throw new CorruptObjectException(id, JGitText.get().corruptObjectNegativeSize);
if (hdr[p.value++] != 0)
throw new CorruptObjectException(id, JGitText.get().corruptObjectGarbageAfterSize);
bytes = new byte[objectSize];
if (p.value < avail)
System.arraycopy(hdr, p.value, bytes, 0, avail - p.value);
decompress(id, inflater, avail - p.value);
} else {
int p = 0;
int c = compressed[p++] & 0xff;
final int typeCode = (c >> 4) & 7;
int size = c & 15;
int shift = 4;
while ((c & 0x80) != 0) {
c = compressed[p++] & 0xff;
size += (c & 0x7f) << shift;
shift += 7;
}
switch (typeCode) {
case Constants.OBJ_COMMIT:
case Constants.OBJ_TREE:
case Constants.OBJ_BLOB:
case Constants.OBJ_TAG:
objectType = typeCode;
break;
default:
throw new CorruptObjectException(id, JGitText.get().corruptObjectInvalidType);
}
objectSize = size;
bytes = new byte[objectSize];
inflater.setInput(compressed, p, compressed.length - p);
decompress(id, inflater, 0);
}
} finally {
InflaterCache.release(inflater);
}
}
private void decompress(final AnyObjectId id, final Inflater inf, int p)
throws CorruptObjectException {
try {
while (!inf.finished()) {
int uncompressed = inf.inflate(bytes, p, objectSize - p);
p += uncompressed;
if (uncompressed == 0 && !inf.finished()) {
throw new CorruptObjectException(id,
JGitText.get().corruptObjectBadStreamCorruptHeader);
}
}
} catch (DataFormatException dfe) {
final CorruptObjectException coe;
coe = new CorruptObjectException(id, JGitText.get().corruptObjectBadStream);
coe.initCause(dfe);
throw coe;
}
if (p != objectSize)
throw new CorruptObjectException(id, JGitText.get().corruptObjectIncorrectLength);
}
@Override
public int getType() {
return objectType;
}
@Override
public long getSize() {
return objectSize;
}
@Override
public byte[] getCachedBytes() {
return bytes;
}
@Override
public int getRawType() {
return objectType;
}
@Override
public long getRawSize() {
return objectSize;
}
}
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