ipa.py 文件源码

def reset_length(self, buf, length):
        """
        Writes an IPA header with the length param. Used externally when
        protocols over provision memory initially and then reset the length.

        Args:
            buf (memoryview): the IPA message
            length (int): length of the protocl message encapsulated by IPA
        Returns:
            None
        """
        if self._osmo_extn is not None:  # Ctrl extn is 0x00
            struct.pack_into('!HBB', buf, 0, length + 1,
                             self._stream_id, self._osmo_extn)
        else:
            struct.pack_into('!HB', buf, 0, length, self._stream_id)