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       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                 :    2153168 : VersionCompat::VersionCompat( SvStream& rStm, sal_uInt16 nStreamMode, sal_uInt16 nVersion ) :
      24                 :            :             mpRWStm     ( &rStm ),
      25                 :            :             mnStmMode   ( nStreamMode ),
      26                 :    2153168 :             mnVersion   ( nVersion )
      27                 :            : {
      28         [ +  - ]:    2153168 :     if( !mpRWStm->GetError() )
      29                 :            :     {
      30         [ +  + ]:    2153168 :         if( STREAM_WRITE == mnStmMode )
      31                 :            :         {
      32                 :    1219117 :             *mpRWStm << mnVersion;
      33                 :    1219117 :             mnTotalSize = ( mnCompatPos = mpRWStm->Tell() ) + 4UL;
      34                 :    1219117 :             mpRWStm->SeekRel( 4L );
      35                 :            :         }
      36                 :            :         else
      37                 :            :         {
      38                 :     934051 :             *mpRWStm >> mnVersion;
      39                 :     934051 :             *mpRWStm >> mnTotalSize;
      40                 :     934051 :             mnCompatPos = mpRWStm->Tell();
      41                 :            :         }
      42                 :            :     }
      43                 :    2153168 : }
      44                 :            : 
      45                 :    2153168 : VersionCompat::~VersionCompat()
      46                 :            : {
      47         [ +  + ]:    2153168 :     if( STREAM_WRITE == mnStmMode )
      48                 :            :     {
      49                 :    1219117 :         const sal_uInt32 nEndPos = mpRWStm->Tell();
      50                 :            : 
      51                 :    1219117 :         mpRWStm->Seek( mnCompatPos );
      52                 :    1219117 :         *mpRWStm << ( nEndPos - mnTotalSize );
      53                 :    1219117 :         mpRWStm->Seek( nEndPos );
      54                 :            :     }
      55                 :            :     else
      56                 :            :     {
      57                 :     934051 :         const sal_uInt32 nReadSize = mpRWStm->Tell() - mnCompatPos;
      58                 :            : 
      59         [ -  + ]:     934051 :         if( mnTotalSize > nReadSize )
      60                 :          0 :             mpRWStm->SeekRel( mnTotalSize - nReadSize );
      61                 :            :     }
      62                 :    2153168 : }
      63                 :            : 
      64                 :            : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */