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_endian.py2.0 KB · 62 lines
import sysfrom ctypes import * _array_type = type(Array) def _other_endian(typ):    """Return the type with the 'other' byte order.  Simple types like    c_int and so on already have __ctype_be__ and __ctype_le__    attributes which contain the types, for more complicated types    arrays and structures are supported.    """    # check _OTHER_ENDIAN attribute (present if typ is primitive type)    if hasattr(typ, _OTHER_ENDIAN):        return getattr(typ, _OTHER_ENDIAN)    # if typ is array    if isinstance(typ, _array_type):        return _other_endian(typ._type_) * typ._length_    # if typ is structure    if issubclass(typ, Structure):        return typ    raise TypeError("This type does not support other endian: %s" % typ) class _swapped_meta(type(Structure)):    def __setattr__(self, attrname, value):        if attrname == "_fields_":            fields = []            for desc in value:                name = desc[0]                typ = desc[1]                rest = desc[2:]                fields.append((name, _other_endian(typ)) + rest)            value = fields        super().__setattr__(attrname, value) ################################################################ # Note: The Structure metaclass checks for the *presence* (not the# value!) of a _swapped_bytes_ attribute to determine the bit order in# structures containing bit fields. if sys.byteorder == "little":    _OTHER_ENDIAN = "__ctype_be__"     LittleEndianStructure = Structure     class BigEndianStructure(Structure, metaclass=_swapped_meta):        """Structure with big endian byte order"""        __slots__ = ()        _swappedbytes_ = None elif sys.byteorder == "big":    _OTHER_ENDIAN = "__ctype_le__"     BigEndianStructure = Structure    class LittleEndianStructure(Structure, metaclass=_swapped_meta):        """Structure with little endian byte order"""        __slots__ = ()        _swappedbytes_ = None else:    raise RuntimeError("Invalid byteorder")