| /* |
| * Copyright (C) 2008-2009, Google Inc. |
| * Copyright (C) 2007, Robin Rosenberg <robin.rosenberg@dewire.com> |
| * Copyright (C) 2006-2008, Shawn O. Pearce <spearce@spearce.org> 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.file; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.util.zip.DataFormatException; |
| import java.util.zip.Inflater; |
| |
| import org.eclipse.jgit.internal.storage.pack.PackOutputStream; |
| |
| /** |
| * A window for accessing git packs using a {@link ByteBuffer} for storage. |
| * |
| * @see ByteWindow |
| */ |
| final class ByteBufferWindow extends ByteWindow { |
| private final ByteBuffer buffer; |
| |
| ByteBufferWindow(PackFile pack, long o, ByteBuffer b) { |
| super(pack, o, b.capacity()); |
| buffer = b; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| protected int copy(int p, byte[] b, int o, int n) { |
| final ByteBuffer s = buffer.slice(); |
| s.position(p); |
| n = Math.min(s.remaining(), n); |
| s.get(b, o, n); |
| return n; |
| } |
| |
| @Override |
| void write(PackOutputStream out, long pos, int cnt) |
| throws IOException { |
| final ByteBuffer s = buffer.slice(); |
| s.position((int) (pos - start)); |
| |
| while (0 < cnt) { |
| byte[] buf = out.getCopyBuffer(); |
| int n = Math.min(cnt, buf.length); |
| s.get(buf, 0, n); |
| out.write(buf, 0, n); |
| cnt -= n; |
| } |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| protected int setInput(int pos, Inflater inf) |
| throws DataFormatException { |
| final ByteBuffer s = buffer.slice(); |
| s.position(pos); |
| final byte[] tmp = new byte[Math.min(s.remaining(), 512)]; |
| s.get(tmp, 0, tmp.length); |
| inf.setInput(tmp, 0, tmp.length); |
| return tmp.length; |
| } |
| } |