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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def dump_memdb(self, with_source_contents=True, with_names=True):
 """Dumps a sourcemap in MemDB format into bytes."""

        len_out = _ffi.new('unsigned int *')
        buf = rustcall(
            _lib.lsm_view_dump_memdb,
            self._get_ptr(), len_out,
            with_source_contents, with_names)
        try:
            rv = _ffi.unpack(buf, len_out[0])
        finally:
            _lib.lsm_buffer_free(buf)
        return rv