docs: protected void advancePosition(int bytes)
    {
      if (tc.isEntryEnabled()) Tr.entry(tc, "advancePosition", new Object[] {this, new Integer(bytes)});
      
      final int newPosition = _buffer.position() + bytes;      
      _buffer.position(newPosition);
      
      if (tc.isDebugEnabled()) Tr.debug(tc, "Buffer's position now " + newPosition);
      
      if (tc.isEntryEnabled()) Tr.exit(tc, "advancePosition");
    }