org.spearce.jgit/src/org/spearce/jgit/lib/ByteArrayWindow.java

   1 /*
   2  * Copyright (C) 2007, Robin Rosenberg <robin.rosenberg@dewire.com>
   3  * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
   4  *
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or
   8  * without modification, are permitted provided that the following
   9  * conditions are met:
  10  *
  11  * - Redistributions of source code must retain the above copyright
  12  *   notice, this list of conditions and the following disclaimer.
  13  *
  14  * - Redistributions in binary form must reproduce the above
  15  *   copyright notice, this list of conditions and the following
  16  *   disclaimer in the documentation and/or other materials provided
  17  *   with the distribution.
  18  *
  19  * - Neither the name of the Git Development Community nor the
  20  *   names of its contributors may be used to endorse or promote
  21  *   products derived from this software without specific prior
  22  *   written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  25  * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  26  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  27  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  29  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  30  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  31  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  32  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  33  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  34  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  36  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  37  */
  38
  39 package org.spearce.jgit.lib;
  40
  41 import java.util.zip.DataFormatException;
  42 import java.util.zip.Inflater;
  43
  44 /**
  45  * A {@link ByteWindow} with an underlying byte array for storage.
  46  */
  47 final class ByteArrayWindow extends ByteWindow<byte[]> {
  48         /**
  49          * Constructor for ByteWindow.
  50          *
  51          * @param o
  52          *            the WindowedFile providing data access
  53          * @param p
  54          *            the file offset.
  55          * @param d
  56          *            an id provided by the WindowedFile. See
  57          *            {@link WindowCache#get(WindowCursor, WindowedFile, long)}.
  58          * @param b
  59          *            byte array for storage
  60          */
  61         ByteArrayWindow(final WindowedFile o, final long p, final int d,
  62                         final byte[] b) {
  63                 super(o, p, d, b, b.length);
  64         }
  65
  66         int copy(final byte[] array, final int p, final byte[] b, final int o, int n) {
  67                 n = Math.min(array.length - p, n);
  68                 System.arraycopy(array, p, b, o, n);
  69                 return n;
  70         }
  71
  72         int inflate(final byte[] array, final int pos, final byte[] b, int o,
  73                         final Inflater inf) throws DataFormatException {
  74                 while (!inf.finished()) {
  75                         if (inf.needsInput()) {
  76                                 inf.setInput(array, pos, array.length - pos);
  77                                 break;
  78                         }
  79                         o += inf.inflate(b, o, b.length - o);
  80                 }
  81                 while (!inf.finished() && !inf.needsInput())
  82                         o += inf.inflate(b, o, b.length - o);
  83                 return o;
  84         }
  85 }