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

   1 /*
   2  *  Copyright (C) 2006  Shawn Pearce <spearce@spearce.org>
   3  *
   4  *  This library is free software; you can redistribute it and/or
   5  *  modify it under the terms of the GNU Lesser General Public
   6  *  License, version 2.1, as published by the Free Software Foundation.
   7  *
   8  *  This library is distributed in the hope that it will be useful,
   9  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  *  Lesser General Public License for more details.
  12  *
  13  *  You should have received a copy of the GNU Lesser General Public
  14  *  License along with this library; if not, write to the Free Software
  15  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
  16  */
  17 package org.spearce.jgit.lib;
  18
  19 import java.nio.ByteBuffer;
  20 import java.util.zip.DataFormatException;
  21 import java.util.zip.Inflater;
  22
  23 public final class ByteBufferWindow extends ByteWindow {
  24     private final ByteBuffer buffer;
  25
  26     public ByteBufferWindow(final WindowProvider o, final int d,
  27             final ByteBuffer b) {
  28         super(o, d);
  29         buffer = b;
  30     }
  31
  32     public final int copy(final int p, final byte[] b, final int o, int n) {
  33         final ByteBuffer s = buffer.slice();
  34         s.position(p);
  35         n = Math.min(s.remaining(), n);
  36         s.get(b, o, n);
  37         return n;
  38     }
  39
  40     public int inflate(final int pos, final byte[] b, int o, final Inflater inf)
  41             throws DataFormatException {
  42         final byte[] tmp = new byte[512];
  43         final ByteBuffer s = buffer.slice();
  44         s.position(pos);
  45         while (s.remaining() > 0 && !inf.finished()) {
  46             if (inf.needsInput()) {
  47                 final int n = Math.min(s.remaining(), tmp.length);
  48                 s.get(tmp, 0, n);
  49                 inf.setInput(tmp, 0, n);
  50             }
  51             o += inf.inflate(b, o, b.length - o);
  52         }
  53         while (!inf.finished() && !inf.needsInput())
  54             o += inf.inflate(b, o, b.length - o);
  55         return o;
  56     }
  57
  58     public int size() {
  59         return buffer.capacity();
  60     }
  61 }