A bitfield of an “underaligned” type (one whose alignment is smaller than its size) can cause the “storage unit” thatctypesuses for handling the bitfield to extend past the containing Structure. For example,
]classBitField1U(ctypes.Union):_pack_=1_fields_=[("fields",BitField1), ("raw_bytes",ctypes.c_ubyte*4)]classBitField2(ctypes.BigEndianStructure):_pack_=1_fields_=[ ('a',ctypes.c_ushort,3), ('b',ctypes.c_ushort,1), ]classBitField2U(ctypes.Union):_pack_=1_fields_=[("fields...
Structure which describes an attribute of a type which corresponds to a C struct member. Its fields are: FieldC TypeMeaning namechar *name of the member typeintthe type of the member in the C struct offsetPy_ssize_tthe offset in bytes that the member is located on the type’s object ...
# -*- coding: utf-8 -*- # # TARGET arch is: [] # WORD_SIZE is: 8 # POINTER_SIZE is: 8 # LONGDOUBLE_SIZE is: 16 # import ctypes class struct_my_bitfield(ctypes.Structure): _pack_ = True # source:False _fields_ = [ ('a', ctypes.c_int64, 3), ('b', ctypes.c_int64...
There appears to be a bug related to sizing/packing of ctypes Structures on Linux. I'm not quite sure how, but this structure: class MyStructure(Structure): _pack_ = 1 _fields_ = [ ("P", c_uint16), # 2 Bytes ("L", c_uint16, 9), ("Pro", c_uint16, 1), ("G", c_ui...
struct_my_bitfield(ctypes.Structure):_pack_=True# source:False_fields_=[ ('a',ctypes.c_int64,3), ('b',ctypes.c_int64,4), ('c',ctypes.c_int64,3), ('d',ctypes.c_int64,3), ('f',ctypes.c_int64,2), ('PADDING_0',ctypes.c_int64,49)]__all__=\ ['struct_my_bitfield']...
mode: int Operating-system mode bitfield. Be careful when using number literals for *mode*. The conventional UNIX notation for numeric modes uses an octal base, which needs to be indicated with a ``0o`` prefix in Python. Change the access permissions of the file given by file descri...