org.spearce.jgit/src/org/spearce/jgit/lib/PackIndexWriterV1.java

   1 /*
   2  * Copyright (C) 2008, 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.io.IOException;
  42 import java.io.OutputStream;
  43
  44 import org.spearce.jgit.transport.PackedObjectInfo;
  45 import org.spearce.jgit.util.NB;
  46
  47 /**
  48  * Creates the version 1 (old style) pack table of contents files.
  49  *
  50  * @see PackIndexWriter
  51  * @see PackIndexV1
  52  */
  53 class PackIndexWriterV1 extends PackIndexWriter {
  54         static boolean canStore(final PackedObjectInfo oe) {
  55                 // We are limited to 4 GB per pack as offset is 32 bit unsigned int.
  56                 //
  57                 return oe.getOffset() >>> 1 < Integer.MAX_VALUE;
  58         }
  59
  60         PackIndexWriterV1(final OutputStream dst) {
  61                 super(dst);
  62         }
  63
  64         @Override
  65         protected void writeImpl() throws IOException {
  66                 writeFanOutTable();
  67
  68                 for (final PackedObjectInfo oe : entries) {
  69                         if (!canStore(oe))
  70                                 throw new IOException("Pack too large for index version 1");
  71                         NB.encodeInt32(tmp, 0, (int) oe.getOffset());
  72                         oe.copyRawTo(tmp, 4);
  73                         out.write(tmp);
  74                 }
  75
  76                 writeChecksumFooter();
  77         }
  78 }