1 /* 2 * Copyright (C) 2008-2009, Google Inc. 3 * Copyright (C) 2007, Robin Rosenberg <robin.rosenberg@dewire.com> 4 * Copyright (C) 2006-2008, Shawn O. Pearce <spearce@spearce.org> 5 * and other copyright owners as documented in the project's IP log. 6 * 7 * This program and the accompanying materials are made available 8 * under the terms of the Eclipse Distribution License v1.0 which 9 * accompanies this distribution, is reproduced below, and is 10 * available at http://www.eclipse.org/org/documents/edl-v10.php 11 * 12 * All rights reserved. 13 * 14 * Redistribution and use in source and binary forms, with or 15 * without modification, are permitted provided that the following 16 * conditions are met: 17 * 18 * - Redistributions of source code must retain the above copyright 19 * notice, this list of conditions and the following disclaimer. 20 * 21 * - Redistributions in binary form must reproduce the above 22 * copyright notice, this list of conditions and the following 23 * disclaimer in the documentation and/or other materials provided 24 * with the distribution. 25 * 26 * - Neither the name of the Eclipse Foundation, Inc. nor the 27 * names of its contributors may be used to endorse or promote 28 * products derived from this software without specific prior 29 * written permission. 30 * 31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 32 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 33 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 34 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 35 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 36 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 37 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 38 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 39 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 40 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 41 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 42 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 43 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 44 */ 45 46 package org.eclipse.jgit.internal.storage.file; 47 48 import java.io.IOException; 49 import java.nio.ByteBuffer; 50 import java.util.zip.DataFormatException; 51 import java.util.zip.Inflater; 52 53 import org.eclipse.jgit.internal.storage.pack.PackOutputStream; 54 55 /** 56 * A window for accessing git packs using a {@link ByteBuffer} for storage. 57 * 58 * @see ByteWindow 59 */ 60 final class ByteBufferWindow extends ByteWindow { 61 private final ByteBuffer buffer; 62 63 ByteBufferWindow(PackFile pack, long o, ByteBuffer b) { 64 super(pack, o, b.capacity()); 65 buffer = b; 66 } 67 68 /** {@inheritDoc} */ 69 @Override 70 protected int copy(int p, byte[] b, int o, int n) { 71 final ByteBuffer s = buffer.slice(); 72 s.position(p); 73 n = Math.min(s.remaining(), n); 74 s.get(b, o, n); 75 return n; 76 } 77 78 @Override 79 void write(PackOutputStream out, long pos, int cnt) 80 throws IOException { 81 final ByteBuffer s = buffer.slice(); 82 s.position((int) (pos - start)); 83 84 while (0 < cnt) { 85 byte[] buf = out.getCopyBuffer(); 86 int n = Math.min(cnt, buf.length); 87 s.get(buf, 0, n); 88 out.write(buf, 0, n); 89 cnt -= n; 90 } 91 } 92 93 /** {@inheritDoc} */ 94 @Override 95 protected int setInput(int pos, Inflater inf) 96 throws DataFormatException { 97 final ByteBuffer s = buffer.slice(); 98 s.position(pos); 99 final byte[] tmp = new byte[Math.min(s.remaining(), 512)]; 100 s.get(tmp, 0, tmp.length); 101 inf.setInput(tmp, 0, tmp.length); 102 return tmp.length; 103 } 104 }