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.util.zip.CRC32;
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 {@link ByteWindow} with an underlying byte array for storage.
57 */
58 final class ByteArrayWindow extends ByteWindow {
59 private final byte[] array;
60
61 ByteArrayWindow(PackFile pack, long o, byte[] b) {
62 super(pack, o, b.length);
63 array = b;
64 }
65
66 /** {@inheritDoc} */
67 @Override
68 protected int copy(int p, byte[] b, int o, int n) {
69 n = Math.min(array.length - p, n);
70 System.arraycopy(array, p, b, o, n);
71 return n;
72 }
73
74 /** {@inheritDoc} */
75 @Override
76 protected int setInput(int pos, Inflater inf)
77 throws DataFormatException {
78 int n = array.length - pos;
79 inf.setInput(array, pos, n);
80 return n;
81 }
82
83 void crc32(CRC32 out, long pos, int cnt) {
84 out.update(array, (int) (pos - start), cnt);
85 }
86
87 @Override
88 void write(PackOutputStream out, long pos, int cnt)
89 throws IOException {
90 int ptr = (int) (pos - start);
91 out.write(array, ptr, cnt);
92 }
93
94 void check(Inflater inf, byte[] tmp, long pos, int cnt)
95 throws DataFormatException {
96 inf.setInput(array, (int) (pos - start), cnt);
97 while (inf.inflate(tmp, 0, tmp.length) > 0)
98 continue;
99 }
100 }