| /* |
| * Copyright (C) 2011, 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.dht; |
| |
| import java.io.BufferedInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.zip.InflaterInputStream; |
| |
| import org.eclipse.jgit.errors.LargeObjectException; |
| import org.eclipse.jgit.errors.MissingObjectException; |
| import org.eclipse.jgit.generated.storage.dht.proto.GitStore.ChunkMeta; |
| import org.eclipse.jgit.lib.ObjectLoader; |
| import org.eclipse.jgit.lib.ObjectStream; |
| |
| /** Loader for a large non-delta object. */ |
| class LargeNonDeltaObject extends ObjectLoader { |
| private final int type; |
| |
| private final long sz; |
| |
| private final int pos; |
| |
| private final DhtReader ctx; |
| |
| private final ChunkMeta meta; |
| |
| private PackChunk firstChunk; |
| |
| LargeNonDeltaObject(int type, long sz, PackChunk pc, int pos, DhtReader ctx) { |
| this.type = type; |
| this.sz = sz; |
| this.pos = pos; |
| this.ctx = ctx; |
| this.meta = pc.getMeta(); |
| firstChunk = pc; |
| } |
| |
| @Override |
| public boolean isLarge() { |
| return true; |
| } |
| |
| @Override |
| public byte[] getCachedBytes() throws LargeObjectException { |
| throw new LargeObjectException.ExceedsByteArrayLimit(); |
| } |
| |
| @Override |
| public int getType() { |
| return type; |
| } |
| |
| @Override |
| public long getSize() { |
| return sz; |
| } |
| |
| @Override |
| public ObjectStream openStream() throws MissingObjectException, IOException { |
| PackChunk pc = firstChunk; |
| if (pc != null) |
| firstChunk = null; |
| else |
| pc = ctx.getChunk(ChunkKey.fromString(meta.getFragment(0))); |
| |
| InputStream in = new ChunkInputStream(meta, ctx, pos, pc); |
| in = new BufferedInputStream(new InflaterInputStream(in), 8192); |
| return new ObjectStream.Filter(type, sz, in); |
| } |
| |
| private static class ChunkInputStream extends InputStream { |
| private final ChunkMeta meta; |
| |
| private final DhtReader ctx; |
| |
| private int ptr; |
| |
| private PackChunk pc; |
| |
| private int fragment; |
| |
| ChunkInputStream(ChunkMeta meta, DhtReader ctx, int pos, PackChunk pc) { |
| this.ctx = ctx; |
| this.meta = meta; |
| this.ptr = pos; |
| this.pc = pc; |
| } |
| |
| @Override |
| public int read(byte[] dstbuf, int dstptr, int dstlen) |
| throws IOException { |
| if (0 == dstlen) |
| return 0; |
| |
| int n = pc.read(ptr, dstbuf, dstptr, dstlen); |
| if (n == 0) { |
| if (fragment == meta.getFragmentCount()) |
| return -1; |
| |
| pc = ctx.getChunk(ChunkKey.fromString( |
| meta.getFragment(++fragment))); |
| ptr = 0; |
| n = pc.read(ptr, dstbuf, dstptr, dstlen); |
| if (n == 0) |
| return -1; |
| } |
| ptr += n; |
| return n; |
| } |
| |
| @Override |
| public int read() throws IOException { |
| byte[] tmp = new byte[1]; |
| int n = read(tmp, 0, 1); |
| return n == 1 ? tmp[0] & 0xff : -1; |
| } |
| } |
| } |