tools/source/stream/vcompat.cxx

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  30
  31 // MARKER(update_precomp.py): autogen include statement, do not remove
  32 #include "precompiled_tools.hxx"
  33
  34 #define _VCOMPAT_CXX
  35 #include <tools/stream.hxx>
  36 #include <tools/vcompat.hxx>
  37
  38 // -----------------
  39 // - VersionCompat -
  40 // -----------------
  41
  42 VersionCompat::VersionCompat( SvStream& rStm, USHORT nStreamMode, USHORT nVersion ) :
  43             mpRWStm     ( &rStm ),
  44             mnStmMode   ( nStreamMode ),
  45             mnVersion   ( nVersion )
  46 {
  47     if( !mpRWStm->GetError() )
  48     {
  49         if( STREAM_WRITE == mnStmMode )
  50         {
  51             *mpRWStm << mnVersion;
  52             mnTotalSize = ( mnCompatPos = mpRWStm->Tell() ) + 4UL;
  53             mpRWStm->SeekRel( 4L );
  54         }
  55         else
  56         {
  57             *mpRWStm >> mnVersion;
  58             *mpRWStm >> mnTotalSize;
  59             mnCompatPos = mpRWStm->Tell();
  60         }
  61     }
  62 }
  63
  64 // ------------------------------------------------------------------------
  65
  66 VersionCompat::~VersionCompat()
  67 {
  68     if( STREAM_WRITE == mnStmMode )
  69     {
  70         const UINT32 nEndPos = mpRWStm->Tell();
  71
  72         mpRWStm->Seek( mnCompatPos );
  73         *mpRWStm << ( nEndPos - mnTotalSize );
  74         mpRWStm->Seek( nEndPos );
  75     }
  76     else
  77     {
  78         const UINT32 nReadSize = mpRWStm->Tell() - mnCompatPos;
  79
  80         if( mnTotalSize > nReadSize )
  81             mpRWStm->SeekRel( mnTotalSize - nReadSize );
  82     }
  83 }