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 VersionCompat::VersionCompat( SvStream& rStm, StreamMode nStreamMode, sal_uInt16 nVersion ) :
  24             mpRWStm     ( &rStm ),
  25             mnCompatPos ( 0 ),
  26             mnTotalSize ( 0 ),
  27             mnStmMode   ( nStreamMode ),
  28             mnVersion   ( nVersion )
  29 {
  30     if( mpRWStm->GetError() )
  31         return;
  32
  33     if( StreamMode::WRITE == mnStmMode )
  34     {
  35         mpRWStm->WriteUInt16( mnVersion );
  36         mnCompatPos = mpRWStm->Tell();
  37         mnTotalSize = mnCompatPos + 4;
  38         mpRWStm->SeekRel( 4 );
  39     }
  40     else
  41     {
  42         mpRWStm->ReadUInt16( mnVersion );
  43         mpRWStm->ReadUInt32( mnTotalSize );
  44         mnCompatPos = mpRWStm->Tell();
  45     }
  46 }
  47
  48 VersionCompat::~VersionCompat()
  49 {
  50     if( StreamMode::WRITE == mnStmMode )
  51     {
  52         const sal_uInt32 nEndPos = mpRWStm->Tell();
  53
  54         mpRWStm->Seek( mnCompatPos );
  55         mpRWStm->WriteUInt32(  nEndPos - mnTotalSize  );
  56         mpRWStm->Seek( nEndPos );
  57     }
  58     else
  59     {
  60         const sal_uInt32 nReadSize = mpRWStm->Tell() - mnCompatPos;
  61
  62         if( mnTotalSize > nReadSize )
  63             mpRWStm->SeekRel( mnTotalSize - nReadSize );
  64     }
  65 }
  66
  67 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */