| /* |
| * Copyright (C) 2008-2011, Google Inc. |
| * Copyright (C) 2007, Robin Rosenberg <robin.rosenberg@dewire.com> |
| * Copyright (C) 2006-2008, Shawn O. Pearce <spearce@spearce.org> |
| * 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.internal.storage.dfs; |
| |
| import java.io.IOException; |
| import java.util.zip.CRC32; |
| import java.util.zip.DataFormatException; |
| import java.util.zip.Inflater; |
| |
| import org.eclipse.jgit.internal.storage.pack.PackOutputStream; |
| |
| /** A cached slice of a {@link DfsPackFile}. */ |
| final class DfsBlock { |
| final DfsPackKey pack; |
| |
| final long start; |
| |
| final long end; |
| |
| private final byte[] block; |
| |
| DfsBlock(DfsPackKey p, long pos, byte[] buf) { |
| pack = p; |
| start = pos; |
| end = pos + buf.length; |
| block = buf; |
| } |
| |
| int size() { |
| return block.length; |
| } |
| |
| boolean contains(DfsPackKey want, long pos) { |
| return pack == want && start <= pos && pos < end; |
| } |
| |
| int copy(long pos, byte[] dstbuf, int dstoff, int cnt) { |
| int ptr = (int) (pos - start); |
| return copy(ptr, dstbuf, dstoff, cnt); |
| } |
| |
| int copy(int p, byte[] b, int o, int n) { |
| n = Math.min(block.length - p, n); |
| System.arraycopy(block, p, b, o, n); |
| return n; |
| } |
| |
| int setInput(long pos, Inflater inf) throws DataFormatException { |
| int ptr = (int) (pos - start); |
| int cnt = block.length - ptr; |
| if (cnt <= 0) { |
| throw new DataFormatException(cnt + " bytes to inflate:" //$NON-NLS-1$ |
| + " at pos=" + pos //$NON-NLS-1$ |
| + "; block.start=" + start //$NON-NLS-1$ |
| + "; ptr=" + ptr //$NON-NLS-1$ |
| + "; block.length=" + block.length); //$NON-NLS-1$ |
| } |
| inf.setInput(block, ptr, cnt); |
| return cnt; |
| } |
| |
| void crc32(CRC32 out, long pos, int cnt) { |
| int ptr = (int) (pos - start); |
| out.update(block, ptr, cnt); |
| } |
| |
| void write(PackOutputStream out, long pos, int cnt) |
| throws IOException { |
| out.write(block, (int) (pos - start), cnt); |
| } |
| |
| void check(Inflater inf, byte[] tmp, long pos, int cnt) |
| throws DataFormatException { |
| // Unlike inflate() above the exact byte count is known by the caller. |
| // Push all of it in a single invocation to avoid unnecessary loops. |
| // |
| inf.setInput(block, (int) (pos - start), cnt); |
| while (inf.inflate(tmp, 0, tmp.length) > 0) |
| continue; |
| } |
| } |