code: def get_end_offset( self, value, parent=None, index=None ):
          
          return self.get_start_offset( value, parent, index ) + self.get_size( value, parent, index )
docs: Return the end offset of the Field's data. Useful for chainloading.
  
          value
              Input Python object to process.
  
          parent
              Parent block object where this Field is defined. Used for e.g.
              evaluating Refs.
  
          index
              Index of the Python object to measure from. Used if the Field
              takes a list of objects.