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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_svtools.hxx"


#include <svtools/imap.hxx>

#include <tools/debug.hxx>


/******************************************************************************
|*
|* Ctor
|*
\******************************************************************************/

IMapCompat::IMapCompat( SvStream& rStm, const sal_uInt16 nStreamMode ) :
			pRWStm		( &rStm ),
			nStmMode	( nStreamMode )
{
	DBG_ASSERT( nStreamMode == STREAM_READ || nStreamMode == STREAM_WRITE, "Wrong Mode!" );

	if ( !pRWStm->GetError() )
	{
		if ( nStmMode == STREAM_WRITE )
		{
			nCompatPos = pRWStm->Tell();
			pRWStm->SeekRel( 4 );
			nTotalSize = nCompatPos + 4;
		}
		else
		{
			sal_uInt32 nTotalSizeTmp;
			*pRWStm >> nTotalSizeTmp;
			nTotalSize = nTotalSizeTmp;
			nCompatPos = pRWStm->Tell();
		}
	}
}


/******************************************************************************
|*
|* Dtor
|*
\******************************************************************************/

IMapCompat::~IMapCompat()
{
	if ( !pRWStm->GetError() )
	{
		if ( nStmMode == STREAM_WRITE )
		{
			const sal_uLong	nEndPos = pRWStm->Tell();

			pRWStm->Seek( nCompatPos );
			*pRWStm << (sal_uInt32) ( nEndPos - nTotalSize );
			pRWStm->Seek( nEndPos );
		}
		else
		{
			const sal_uLong nReadSize = pRWStm->Tell() - nCompatPos;

			if ( nTotalSize > nReadSize )
				pRWStm->SeekRel( nTotalSize - nReadSize );
		}
	}
}