tools/source/stream/vcompat.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <tools/stream.hxx>
  21 #include <tools/vcompat.hxx>
  22
  23 VersionCompatRead::VersionCompatRead(SvStream& rStm)
  24     : mrRStm(rStm)
  25     , mnCompatPos(0)
  26     , mnTotalSize(0)
  27     , mnVersion(1)
  28 {
  29     if (mrRStm.GetError())
  30         return;
  31
  32     mrRStm.ReadUInt16(mnVersion);
  33     mrRStm.ReadUInt32(mnTotalSize);
  34     mnCompatPos = mrRStm.Tell();
  35 }
  36
  37 VersionCompatWrite::VersionCompatWrite(SvStream& rStm, sal_uInt16 nVersion)
  38     : mrWStm(rStm)
  39     , mnCompatPos(0)
  40     , mnTotalSize(0)
  41 {
  42     if (mrWStm.GetError())
  43         return;
  44
  45     mrWStm.WriteUInt16(nVersion);
  46     mnCompatPos = mrWStm.Tell();
  47     mnTotalSize = mnCompatPos + 4;
  48     mrWStm.SeekRel(4);
  49 }
  50
  51 VersionCompatRead::~VersionCompatRead()
  52 {
  53     const sal_uInt32 nReadSize = mrRStm.Tell() - mnCompatPos;
  54
  55     if (mnTotalSize > nReadSize)
  56         mrRStm.SeekRel(mnTotalSize - nReadSize);
  57 }
  58
  59 VersionCompatWrite::~VersionCompatWrite()
  60 {
  61     const sal_uInt32 nEndPos = mrWStm.Tell();
  62
  63     mrWStm.Seek(mnCompatPos);
  64     mrWStm.WriteUInt32(nEndPos - mnTotalSize);
  65     mrWStm.Seek(nEndPos);
  66 }
  67
  68 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */