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// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_vcl.hxx"
#include <tools/stream.hxx>
#include <svcompat.hxx>

// --------------
// - 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 );
    }
}

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