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/*
* Copyright (C) 2010, Google Inc. and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* https://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.eclipse.jgit.internal.storage.dfs;
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.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectLoader;
import org.eclipse.jgit.lib.ObjectStream;
final class LargePackedWholeObject extends ObjectLoader {
private final int type;
private final long size;
private final long objectOffset;
private final int headerLength;
private final DfsPackFile pack;
private final DfsObjDatabase db;
LargePackedWholeObject(int type, long size, long objectOffset,
int headerLength, DfsPackFile pack, DfsObjDatabase db) {
this.type = type;
this.size = size;
this.objectOffset = objectOffset;
this.headerLength = headerLength;
this.pack = pack;
this.db = db;
}
@Override
public int getType() {
return type;
}
@Override
public long getSize() {
return size;
}
@Override
public boolean isLarge() {
return true;
}
@Override
public byte[] getCachedBytes() throws LargeObjectException {
throw new LargeObjectException();
}
@Override
public ObjectStream openStream() throws MissingObjectException, IOException {
PackInputStream packIn;
// ctx is closed by PackInputStream, or explicitly in the finally block
DfsReader ctx = db.newReader();
try {
try {
packIn = new PackInputStream(
pack, objectOffset + headerLength, ctx);
ctx = null; // owned by packIn
} 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.
ObjectId obj = pack.getReverseIdx(ctx).findObject(objectOffset);
return ctx.open(obj, type).openStream();
}
} finally {
if (ctx != null) {
ctx.close();
}
}
// Align buffer to inflater size, at a larger than default block.
// This reduces the number of context switches from the
// caller down into the pack stream inflation.
int bufsz = 8192;
InputStream in = new BufferedInputStream(
new InflaterInputStream(packIn, packIn.ctx.inflater(), bufsz),
bufsz);
return new ObjectStream.Filter(type, size, in);
}
}
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