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- /*
- * 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;
- }
- }
- }
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