org.spearce.jgit/src/org/spearce/jgit/lib/PackIndexWriterV2.java

   1 /*
   2  * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
   3  *
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or
   7  * without modification, are permitted provided that the following
   8  * conditions are met:
   9  *
  10  * - Redistributions of source code must retain the above copyright
  11  *   notice, this list of conditions and the following disclaimer.
  12  *
  13  * - Redistributions in binary form must reproduce the above
  14  *   copyright notice, this list of conditions and the following
  15  *   disclaimer in the documentation and/or other materials provided
  16  *   with the distribution.
  17  *
  18  * - Neither the name of the Git Development Community nor the
  19  *   names of its contributors may be used to endorse or promote
  20  *   products derived from this software without specific prior
  21  *   written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  24  * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  25  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  26  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  28  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  29  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  30  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  31  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  32  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  33  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  35  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 package org.spearce.jgit.lib;
  39
  40 import java.io.IOException;
  41 import java.io.OutputStream;
  42
  43 import org.spearce.jgit.transport.PackedObjectInfo;
  44 import org.spearce.jgit.util.NB;
  45
  46 /**
  47  * Creates the version 2 pack table of contents files.
  48  *
  49  * @see PackIndexWriter
  50  * @see PackIndexV2
  51  */
  52 class PackIndexWriterV2 extends PackIndexWriter {
  53         PackIndexWriterV2(final OutputStream dst) {
  54                 super(dst);
  55         }
  56
  57         @Override
  58         protected void writeImpl() throws IOException {
  59                 writeTOC(2);
  60                 writeFanOutTable();
  61                 writeObjectNames();
  62                 writeCRCs();
  63                 writeOffset32();
  64                 writeOffset64();
  65                 writeChecksumFooter();
  66         }
  67
  68         private void writeObjectNames() throws IOException {
  69                 for (final PackedObjectInfo oe : entries)
  70                         oe.copyRawTo(out);
  71         }
  72
  73         private void writeCRCs() throws IOException {
  74                 for (final PackedObjectInfo oe : entries) {
  75                         NB.encodeInt32(tmp, 0, oe.getCRC());
  76                         out.write(tmp, 0, 4);
  77                 }
  78         }
  79
  80         private void writeOffset32() throws IOException {
  81                 int o64 = 0;
  82                 for (final PackedObjectInfo oe : entries) {
  83                         final long o = oe.getOffset();
  84                         if (o < Integer.MAX_VALUE)
  85                                 NB.encodeInt32(tmp, 0, (int) o);
  86                         else
  87                                 NB.encodeInt32(tmp, 0, (1 << 31) | o64++);
  88                         out.write(tmp, 0, 4);
  89                 }
  90         }
  91
  92         private void writeOffset64() throws IOException {
  93                 for (final PackedObjectInfo oe : entries) {
  94                         final long o = oe.getOffset();
  95                         if (o > Integer.MAX_VALUE) {
  96                                 NB.encodeInt64(tmp, 0, o);
  97                                 out.write(tmp, 0, 8);
  98                         }
  99                 }
 100         }
 101 }