code: public void copyBufferStateFrom(WstxInputData src)
      {
          mInputBuffer = src.mInputBuffer;
          mInputPtr = src.mInputPtr;
          mInputEnd = src.mInputEnd;
  
          mCurrInputProcessed = src.mCurrInputProcessed;
          mCurrInputRow = src.mCurrInputRow;
          mCurrInputRowStart = src.mCurrInputRowStart;
      }
docs: Note: Only public due to sub-classes needing to call this on
  base class instance from different package (confusing?)