vcl/source/gdi/svcompat.cxx

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  30
  31 // MARKER(update_precomp.py): autogen include statement, do not remove
  32 #include "precompiled_vcl.hxx"
  33 #include <tools/stream.hxx>
  34 #include <svcompat.hxx>
  35
  36 // --------------
  37 // - ImplCompat -
  38 // --------------
  39
  40 ImplCompat::ImplCompat( SvStream& rStm, USHORT nStreamMode, USHORT nVersion ) :
  41             mpRWStm     ( &rStm ),
  42             mnStmMode   ( nStreamMode ),
  43             mnVersion   ( nVersion )
  44 {
  45     if( !mpRWStm->GetError() )
  46     {
  47         if( STREAM_WRITE == mnStmMode )
  48         {
  49             *mpRWStm << mnVersion;
  50             mnTotalSize = ( mnCompatPos = mpRWStm->Tell() ) + 4UL;
  51             mpRWStm->SeekRel( 4L );
  52         }
  53         else
  54         {
  55             *mpRWStm >> mnVersion;
  56             *mpRWStm >> mnTotalSize;
  57             mnCompatPos = mpRWStm->Tell();
  58         }
  59     }
  60 }
  61
  62 // ------------------------------------------------------------------------
  63
  64 ImplCompat::~ImplCompat()
  65 {
  66     if( STREAM_WRITE == mnStmMode )
  67     {
  68         const UINT32 nEndPos = mpRWStm->Tell();
  69
  70         mpRWStm->Seek( mnCompatPos );
  71         *mpRWStm << ( nEndPos - mnTotalSize );
  72         mpRWStm->Seek( nEndPos );
  73     }
  74     else
  75     {
  76         const UINT32 nReadSize = mpRWStm->Tell() - mnCompatPos;
  77
  78         if( mnTotalSize > nReadSize )
  79             mpRWStm->SeekRel( mnTotalSize - nReadSize );
  80     }
  81 }