svtools/source/misc/imap3.cxx

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   9  * $RCSfile: imap3.cxx,v $
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  30
  31 // MARKER(update_precomp.py): autogen include statement, do not remove
  32 #include "precompiled_svtools.hxx"
  33
  34
  35 #include <svtools/imap.hxx>
  36
  37 #include <tools/debug.hxx>
  38
  39
  40 /******************************************************************************
  41 |*
  42 |* Ctor
  43 |*
  44 \******************************************************************************/
  45
  46 IMapCompat::IMapCompat( SvStream& rStm, const USHORT nStreamMode ) :
  47             pRWStm              ( &rStm ),
  48             nStmMode    ( nStreamMode )
  49 {
  50     DBG_ASSERT( nStreamMode == STREAM_READ || nStreamMode == STREAM_WRITE, "Wrong Mode!" );
  51
  52     if ( !pRWStm->GetError() )
  53     {
  54         if ( nStmMode == STREAM_WRITE )
  55         {
  56             nCompatPos = pRWStm->Tell();
  57             pRWStm->SeekRel( 4 );
  58             nTotalSize = nCompatPos + 4;
  59         }
  60         else
  61         {
  62             UINT32 nTotalSizeTmp;
  63             *pRWStm >> nTotalSizeTmp;
  64             nTotalSize = nTotalSizeTmp;
  65             nCompatPos = pRWStm->Tell();
  66         }
  67     }
  68 }
  69
  70
  71 /******************************************************************************
  72 |*
  73 |* Dtor
  74 |*
  75 \******************************************************************************/
  76
  77 IMapCompat::~IMapCompat()
  78 {
  79     if ( !pRWStm->GetError() )
  80     {
  81         if ( nStmMode == STREAM_WRITE )
  82         {
  83             const ULONG nEndPos = pRWStm->Tell();
  84
  85             pRWStm->Seek( nCompatPos );
  86             *pRWStm << (UINT32) ( nEndPos - nTotalSize );
  87             pRWStm->Seek( nEndPos );
  88         }
  89         else
  90         {
  91             const ULONG nReadSize = pRWStm->Tell() - nCompatPos;
  92
  93             if ( nTotalSize > nReadSize )
  94                 pRWStm->SeekRel( nTotalSize - nReadSize );
  95         }
  96     }
  97 }
  98
  99
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