| /* |
| * 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.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 { |
| avail += inflater.inflate(hdr, avail, hdr.length |
| - avail); |
| } catch (DataFormatException dfe) { |
| final CorruptObjectException coe; |
| coe = new CorruptObjectException(id, "bad stream"); |
| coe.initCause(dfe); |
| inflater.end(); |
| throw coe; |
| } |
| if (avail < 5) |
| throw new CorruptObjectException(id, "no header"); |
| |
| 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, "negative size"); |
| if (hdr[p.value++] != 0) |
| throw new CorruptObjectException(id, "garbage after size"); |
| 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, "invalid type"); |
| } |
| |
| 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()) |
| p += inf.inflate(bytes, p, objectSize - p); |
| } catch (DataFormatException dfe) { |
| final CorruptObjectException coe; |
| coe = new CorruptObjectException(id, "bad stream"); |
| coe.initCause(dfe); |
| throw coe; |
| } |
| if (p != objectSize) |
| throw new CorruptObjectException(id, "incorrect length"); |
| } |
| |
| @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; |
| } |
| } |