packet.py 文件源码

 复制代码def __new__(mcs, clsname, clsbases, clsdict):
        headers = clsdict.get('__header__', [])
        if headers:
            header_attrs, header_fmt = zip(*headers)
            header_format_order = clsdict.get('__byte_order__', '>')
            header_format = [header_format_order] + list(header_fmt)
            header_struct = struct.Struct(''.join(header_format))

            clsdict['__slots__'] = ('_fields', '_view', '_payload')
            clsdict['_header_fields'] = tuple(header_attrs)
            clsdict['_header_bytes_order'] = header_format_order
            clsdict['_header_struct'] = header_struct
            clsdict['_header_size'] = header_struct.size

        return type.__new__(mcs, clsname, clsbases, clsdict)