libreoffice/vcl/source/gdi/svcompat.cxx

/*************************************************************************
 *
 *  $RCSfile: svcompat.cxx,v $
 *
 *  $Revision: 1.2 $
 *
 *  last change: $Author: vg $ $Date: 2004-01-06 13:56:30 $
 *
 *  The Contents of this file are made available subject to the terms of
 *  either of the following licenses
 *
 *         - GNU Lesser General Public License Version 2.1
 *         - Sun Industry Standards Source License Version 1.1
 *
 *  Sun Microsystems Inc., October, 2000
 *
 *  GNU Lesser General Public License Version 2.1
 *  =============================================
 *  Copyright 2000 by Sun Microsystems, Inc.
 *  901 San Antonio Road, Palo Alto, CA 94303, USA
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License version 2.1, as published by the Free Software Foundation.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *  MA  02111-1307  USA
 *
 *
 *  Sun Industry Standards Source License Version 1.1
 *  =================================================
 *  The contents of this file are subject to the Sun Industry Standards
 *  Source License Version 1.1 (the "License"); You may not use this file
 *  except in compliance with the License. You may obtain a copy of the
 *  License at http://www.openoffice.org/license.html.
 *
 *  Software provided under this License is provided on an "AS IS" basis,
 *  WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
 *  WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
 *  MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
 *  See the License for the specific provisions governing your rights and
 *  obligations concerning the Software.
 *
 *  The Initial Developer of the Original Code is: Sun Microsystems, Inc.
 *
 *  Copyright: 2000 by Sun Microsystems, Inc.
 *
 *  All Rights Reserved.
 *
 *  Contributor(s): _______________________________________
 *
 *
 ************************************************************************/

#ifndef _STREAM_HXX
#include <tools/stream.hxx>
#endif

#ifndef _SV_SVCOMPAT_HXX
#include <svcompat.hxx>
#endif

// --------------
// - ImplCompat -
// --------------

ImplCompat::ImplCompat( SvStream& rStm, USHORT nStreamMode, USHORT nVersion ) :
            mpRWStm     ( &rStm ),
            mnStmMode   ( nStreamMode ),
            mnVersion   ( nVersion )
{
    if( !mpRWStm->GetError() )
    {
        if( STREAM_WRITE == mnStmMode )
        {
            *mpRWStm << mnVersion;
            mnTotalSize = ( mnCompatPos = mpRWStm->Tell() ) + 4UL;
            mpRWStm->SeekRel( 4L );
        }
        else
        {
            *mpRWStm >> mnVersion;
            *mpRWStm >> mnTotalSize;
            mnCompatPos = mpRWStm->Tell();
        }
    }
}

// ------------------------------------------------------------------------

ImplCompat::~ImplCompat()
{
    if( STREAM_WRITE == mnStmMode )
    {
        const UINT32 nEndPos = mpRWStm->Tell();

        mpRWStm->Seek( mnCompatPos );
        *mpRWStm << ( nEndPos - mnTotalSize );
        mpRWStm->Seek( nEndPos );
    }
    else
    {
        const UINT32 nReadSize = mpRWStm->Tell() - mnCompatPos;

        if( mnTotalSize > nReadSize )
            mpRWStm->SeekRel( mnTotalSize - nReadSize );
    }
}