AL-2020/venv/Lib/site-packages/pygame/tests/test_utils/buftools.py

556 lines
23 KiB
Python

"""Module pygame.tests.test_utils.array
Export the Exporter and Importer classes.
Class Exporter has configurable shape and strides. Exporter objects
provide a convient target for unit tests on Pygame objects and functions that
import a new buffer interface.
Class Importer imports a buffer interface with the given PyBUF_* flags.
It returns NULL Py_buffer fields as None. The shape, strides, and suboffsets
arrays are returned as tuples of ints. All Py_buffer field properties are
read-only. This class is useful in comparing exported buffer interfaces
with the actual request. The simular Python builtin memoryview currently
does not support configurable PyBUF_* flags.
This module contains its own unit tests. When Pygame is installed, these tests
can be run with the following command line statement:
python -m pygame.tests.test_utils.array
"""
import pygame
if not pygame.HAVE_NEWBUF:
emsg = "This Pygame build does not support the new buffer protocol"
raise ImportError(emsg)
import pygame.newbuffer
from pygame.newbuffer import (PyBUF_SIMPLE, PyBUF_FORMAT, PyBUF_ND,
PyBUF_WRITABLE, PyBUF_STRIDES, PyBUF_C_CONTIGUOUS,
PyBUF_F_CONTIGUOUS, PyBUF_ANY_CONTIGUOUS,
PyBUF_INDIRECT, PyBUF_STRIDED, PyBUF_STRIDED_RO,
PyBUF_RECORDS, PyBUF_RECORDS_RO, PyBUF_FULL,
PyBUF_FULL_RO, PyBUF_CONTIG, PyBUF_CONTIG_RO)
import unittest
import sys
import ctypes
import operator
try:
reduce
except NameError:
from functools import reduce
__all__ = ["Exporter", "Importer"]
try:
ctypes.c_ssize_t
except AttributeError:
void_p_sz = ctypes.sizeof(ctypes.c_void_p)
if ctypes.sizeof(ctypes.c_short) == void_p_sz:
ctypes.c_ssize_t = ctypes.c_short
elif ctypes.sizeof(ctypes.c_int) == void_p_sz:
ctypes.c_ssize_t = ctypes.c_int
elif ctypes.sizeof(ctypes.c_long) == void_p_sz:
ctypes.c_ssize_t = ctypes.c_long
elif ctypes.sizeof(ctypes.c_longlong) == void_p_sz:
ctypes.c_ssize_t = ctypes.c_longlong
else:
raise RuntimeError("Cannot set c_ssize_t: sizeof(void *) is %i" %
void_p_sz)
def _prop_get(fn):
return property(fn)
class Exporter(pygame.newbuffer.BufferMixin):
"""An object that exports a multi-dimension new buffer interface
The only array operation this type supports is to export a buffer.
"""
prefixes = {'@': '', '=': '=', '<': '=', '>': '=', '!': '=',
'2': '2', '3': '3', '4': '4', '5': '5',
'6': '6', '7': '7', '8': '8', '9': '9'}
types = {'c': ctypes.c_char, 'b': ctypes.c_byte, 'B': ctypes.c_ubyte,
'=c': ctypes.c_int8, '=b': ctypes.c_int8, '=B': ctypes.c_uint8,
'?': ctypes.c_bool, '=?': ctypes.c_int8,
'h': ctypes.c_short, 'H': ctypes.c_ushort,
'=h': ctypes.c_int16, '=H': ctypes.c_uint16,
'i': ctypes.c_int, 'I': ctypes.c_uint,
'=i': ctypes.c_int32, '=I': ctypes.c_uint32,
'l': ctypes.c_long, 'L': ctypes.c_ulong,
'=l': ctypes.c_int32, '=L': ctypes.c_uint32,
'q': ctypes.c_longlong, 'Q': ctypes.c_ulonglong,
'=q': ctypes.c_int64, '=Q': ctypes.c_uint64,
'f': ctypes.c_float, 'd': ctypes.c_double,
'P': ctypes.c_void_p,
'x': ctypes.c_ubyte * 1,
'2x': ctypes.c_ubyte * 2,
'3x': ctypes.c_ubyte * 3,
'4x': ctypes.c_ubyte * 4,
'5x': ctypes.c_ubyte * 5,
'6x': ctypes.c_ubyte * 6,
'7x': ctypes.c_ubyte * 7,
'8x': ctypes.c_ubyte * 8,
'9x': ctypes.c_ubyte * 9}
def __init__(self,
shape,
format=None,
strides=None,
readonly=None,
itemsize=None):
if format is None:
format = 'B'
if readonly is None:
readonly = False
prefix = ''
typecode = ''
i = 0
if i < len(format):
try:
prefix = self.prefixes[format[i]]
i += 1
except LookupError:
pass
if i < len(format) and format[i] == '1':
i += 1
if i == len(format) - 1:
typecode = format[i]
if itemsize is None:
try:
itemsize = ctypes.sizeof(self.types[prefix + typecode])
except KeyError:
raise ValueError("Unknown item format '" + format + "'")
self.readonly = bool(readonly)
self.format = format
self._format = ctypes.create_string_buffer(format.encode('latin_1'))
self.ndim = len(shape)
self.itemsize = itemsize
self.len = reduce(operator.mul, shape, 1) * self.itemsize
self.shape = tuple(shape)
self._shape = (ctypes.c_ssize_t * self.ndim)(*self.shape)
if strides is None:
self._strides = (ctypes.c_ssize_t * self.ndim)()
self._strides[self.ndim - 1] = itemsize
for i in range(self.ndim - 1, 0, -1):
self._strides[i - 1] = self.shape[i] * self._strides[i]
self.strides = tuple(self._strides)
elif len(strides) == self.ndim:
self.strides = tuple(strides)
self._strides = (ctypes.c_ssize_t * self.ndim)(*self.strides)
else:
raise ValueError("Mismatch in length of strides and shape")
buflen = max(d * abs(s) for d, s in zip(self.shape, self.strides))
self.buflen = buflen
self._buf = (ctypes.c_ubyte * buflen)()
offset = sum((d - 1) * abs(s)
for d, s in zip(self.shape, self.strides) if s < 0)
self.buf = ctypes.addressof(self._buf) + offset
def buffer_info(self):
return (addressof(self.buffer), self.shape[0])
def tobytes(self):
return cast(self.buffer, POINTER(c_char))[0:self._len]
def __len__(self):
return self.shape[0]
def _get_buffer(self, view, flags):
from ctypes import addressof
if (flags & PyBUF_WRITABLE) == PyBUF_WRITABLE and self.readonly:
raise BufferError("buffer is read-only")
if ((flags & PyBUF_C_CONTIGUOUS) == PyBUF_C_CONTIGUOUS and
not self.is_contiguous('C')):
raise BufferError("data is not C contiguous")
if ((flags & PyBUF_F_CONTIGUOUS) == PyBUF_F_CONTIGUOUS and
not self.is_contiguous('F')):
raise BufferError("data is not F contiguous")
if ((flags & PyBUF_ANY_CONTIGUOUS) == PyBUF_ANY_CONTIGUOUS and
not self.is_contiguous('A')):
raise BufferError("data is not contiguous")
view.buf = self.buf
view.readonly = self.readonly
view.len = self.len
if flags | PyBUF_WRITABLE == PyBUF_WRITABLE:
view.ndim = 0
else:
view.ndim = self.ndim
view.itemsize = self.itemsize
if (flags & PyBUF_FORMAT) == PyBUF_FORMAT:
view.format = addressof(self._format)
else:
view.format = None
if (flags & PyBUF_ND) == PyBUF_ND:
view.shape = addressof(self._shape)
elif self.is_contiguous('C'):
view.shape = None
else:
raise BufferError(
"shape required for {} dimensional data".format(self.ndim))
if (flags & PyBUF_STRIDES) == PyBUF_STRIDES:
view.strides = ctypes.addressof(self._strides)
elif view.shape is None or self.is_contiguous('C'):
view.strides = None
else:
raise BufferError("strides required for none C contiguous data")
view.suboffsets = None
view.internal = None
view.obj = self
def is_contiguous(self, fortran):
if fortran in "CA":
if self.strides[-1] == self.itemsize:
for i in range(self.ndim - 1, 0, -1):
if self.strides[i - 1] != self.shape[i] * self.strides[i]:
break
else:
return True
if fortran in "FA":
if self.strides[0] == self.itemsize:
for i in range(0, self.ndim - 1):
if self.strides[i + 1] != self.shape[i] * self.strides[i]:
break
else:
return True
return False
class Importer(object):
"""An object that imports a new buffer interface
The fields of the Py_buffer C struct are exposed by identically
named Importer read-only properties.
"""
def __init__(self, obj, flags):
self._view = pygame.newbuffer.Py_buffer()
self._view.get_buffer(obj, flags)
@property
def obj(self):
"""return object or None for NULL field"""
return self._view.obj
@property
def buf(self):
"""return int or None for NULL field"""
return self._view.buf
@property
def len(self):
"""return int"""
return self._view.len
@property
def readonly(self):
"""return bool"""
return self._view.readonly
@property
def format(self):
"""return bytes or None for NULL field"""
format_addr = self._view.format
if format_addr is None:
return None
return ctypes.cast(format_addr, ctypes.c_char_p).value.decode('ascii')
@property
def itemsize(self):
"""return int"""
return self._view.itemsize
@property
def ndim(self):
"""return int"""
return self._view.ndim
@property
def shape(self):
"""return int tuple or None for NULL field"""
return self._to_ssize_tuple(self._view.shape)
@property
def strides(self):
"""return int tuple or None for NULL field"""
return self._to_ssize_tuple(self._view.strides)
@property
def suboffsets(self):
"""return int tuple or None for NULL field"""
return self._to_ssize_tuple(self._view.suboffsets)
@property
def internal(self):
"""return int or None for NULL field"""
return self._view.internal
def _to_ssize_tuple(self, addr):
from ctypes import cast, POINTER, c_ssize_t
if addr is None:
return None
return tuple(cast(addr, POINTER(c_ssize_t))[0:self._view.ndim])
class ExporterTest(unittest.TestCase):
"""Class Exporter unit tests"""
def test_formats(self):
char_sz = ctypes.sizeof(ctypes.c_char)
short_sz = ctypes.sizeof(ctypes.c_short)
int_sz = ctypes.sizeof(ctypes.c_int)
long_sz = ctypes.sizeof(ctypes.c_long)
longlong_sz = ctypes.sizeof(ctypes.c_longlong)
float_sz = ctypes.sizeof(ctypes.c_float)
double_sz = ctypes.sizeof(ctypes.c_double)
voidp_sz = ctypes.sizeof(ctypes.c_void_p)
bool_sz = ctypes.sizeof(ctypes.c_bool)
self.check_args(0, (1,), 'B', (1,), 1, 1, 1)
self.check_args(1, (1,), 'b', (1,), 1, 1, 1)
self.check_args(1, (1,), 'B', (1,), 1, 1, 1)
self.check_args(1, (1,), 'c', (char_sz,), char_sz, char_sz, char_sz)
self.check_args(1, (1,), 'h', (short_sz,), short_sz, short_sz, short_sz)
self.check_args(1, (1,), 'H', (short_sz,), short_sz, short_sz, short_sz)
self.check_args(1, (1,), 'i', (int_sz,), int_sz, int_sz, int_sz)
self.check_args(1, (1,), 'I', (int_sz,), int_sz, int_sz, int_sz)
self.check_args(1, (1,), 'l', (long_sz,), long_sz, long_sz, long_sz)
self.check_args(1, (1,), 'L', (long_sz,), long_sz, long_sz, long_sz)
self.check_args(1, (1,), 'q', (longlong_sz,),
longlong_sz, longlong_sz, longlong_sz)
self.check_args(1, (1,), 'Q', (longlong_sz,),
longlong_sz, longlong_sz, longlong_sz)
self.check_args(1, (1,), 'f', (float_sz,), float_sz, float_sz, float_sz)
self.check_args(1, (1,), 'd', (double_sz,),
double_sz, double_sz, double_sz)
self.check_args(1, (1,), 'x', (1,), 1, 1, 1)
self.check_args(1, (1,), 'P', (voidp_sz,), voidp_sz, voidp_sz, voidp_sz)
self.check_args(1, (1,), '?', (bool_sz,), bool_sz, bool_sz, bool_sz)
self.check_args(1, (1,), '@b', (1,), 1, 1, 1)
self.check_args(1, (1,), '@B', (1,), 1, 1, 1)
self.check_args(1, (1,), '@c', (char_sz,), char_sz, char_sz, char_sz)
self.check_args(1, (1,), '@h', (short_sz,),
short_sz, short_sz, short_sz)
self.check_args(1, (1,), '@H', (short_sz,),
short_sz, short_sz, short_sz)
self.check_args(1, (1,), '@i', (int_sz,), int_sz, int_sz, int_sz)
self.check_args(1, (1,), '@I', (int_sz,), int_sz, int_sz, int_sz)
self.check_args(1, (1,), '@l', (long_sz,), long_sz, long_sz, long_sz)
self.check_args(1, (1,), '@L', (long_sz,), long_sz, long_sz, long_sz)
self.check_args(1, (1,), '@q',
(longlong_sz,), longlong_sz, longlong_sz, longlong_sz)
self.check_args(1, (1,), '@Q', (longlong_sz,),
longlong_sz, longlong_sz, longlong_sz)
self.check_args(1, (1,), '@f', (float_sz,),
float_sz, float_sz, float_sz)
self.check_args(1, (1,), '@d', (double_sz,),
double_sz, double_sz, double_sz)
self.check_args(1, (1,), '@?', (bool_sz,), bool_sz, bool_sz, bool_sz)
self.check_args(1, (1,), '=b', (1,), 1, 1, 1)
self.check_args(1, (1,), '=B', (1,), 1, 1, 1)
self.check_args(1, (1,), '=c', (1,), 1, 1, 1)
self.check_args(1, (1,), '=h', (2,), 2, 2, 2)
self.check_args(1, (1,), '=H', (2,), 2, 2, 2)
self.check_args(1, (1,), '=i', (4,), 4, 4, 4)
self.check_args(1, (1,), '=I', (4,), 4, 4, 4)
self.check_args(1, (1,), '=l', (4,), 4, 4, 4)
self.check_args(1, (1,), '=L', (4,), 4, 4, 4)
self.check_args(1, (1,), '=q', (8,), 8, 8, 8)
self.check_args(1, (1,), '=Q', (8,), 8, 8, 8)
self.check_args(1, (1,), '=?', (1,), 1, 1, 1)
self.check_args(1, (1,), '<h', (2,), 2, 2, 2)
self.check_args(1, (1,), '>h', (2,), 2, 2, 2)
self.check_args(1, (1,), '!h', (2,), 2, 2, 2)
self.check_args(1, (1,), '<q', (8,), 8, 8, 8)
self.check_args(1, (1,), '>q', (8,), 8, 8, 8)
self.check_args(1, (1,), '!q', (8,), 8, 8, 8)
self.check_args(1, (1,), '1x', (1,), 1, 1, 1)
self.check_args(1, (1,), '2x', (2,), 2, 2, 2)
self.check_args(1, (1,), '3x', (3,), 3, 3, 3)
self.check_args(1, (1,), '4x', (4,), 4, 4, 4)
self.check_args(1, (1,), '5x', (5,), 5, 5, 5)
self.check_args(1, (1,), '6x', (6,), 6, 6, 6)
self.check_args(1, (1,), '7x', (7,), 7, 7, 7)
self.check_args(1, (1,), '8x', (8,), 8, 8, 8)
self.check_args(1, (1,), '9x', (9,), 9, 9, 9)
self.check_args(1, (1,), '1h', (2,), 2, 2, 2)
self.check_args(1, (1,), '=1h', (2,), 2, 2, 2)
self.assertRaises(ValueError, Exporter, (2, 1), '')
self.assertRaises(ValueError, Exporter, (2, 1), 'W')
self.assertRaises(ValueError, Exporter, (2, 1), '^Q')
self.assertRaises(ValueError, Exporter, (2, 1), '=W')
self.assertRaises(ValueError, Exporter, (2, 1), '=f')
self.assertRaises(ValueError, Exporter, (2, 1), '=d')
self.assertRaises(ValueError, Exporter, (2, 1), '<f')
self.assertRaises(ValueError, Exporter, (2, 1), '<d')
self.assertRaises(ValueError, Exporter, (2, 1), '>f')
self.assertRaises(ValueError, Exporter, (2, 1), '>d')
self.assertRaises(ValueError, Exporter, (2, 1), '!f')
self.assertRaises(ValueError, Exporter, (2, 1), '!d')
self.assertRaises(ValueError, Exporter, (2, 1), '0x')
self.assertRaises(ValueError, Exporter, (2, 1), '11x')
self.assertRaises(ValueError, Exporter, (2, 1), 'BB')
def test_strides(self):
self.check_args(1, (10,), '=h', (2,), 20, 20, 2)
self.check_args(1, (5, 3), '=h', (6, 2), 30, 30, 2)
self.check_args(1, (7, 3, 5), '=h', (30, 10, 2), 210, 210, 2)
self.check_args(1, (13, 5, 11, 3), '=h', (330, 66, 6, 2), 4290, 4290, 2)
self.check_args(3, (7, 3, 5), '=h', (2, 14, 42), 210, 210, 2)
self.check_args(3, (7, 3, 5), '=h', (2, 16, 48), 210, 240, 2)
self.check_args(3, (13, 5, 11, 3), '=h', (440, 88, 8, 2), 4290, 5720, 2)
self.check_args(3, (7, 5), '3x', (15, 3), 105, 105, 3)
self.check_args(3, (7, 5), '3x', (3, 21), 105, 105, 3)
self.check_args(3, (7, 5), '3x', (3, 24), 105, 120, 3)
def test_readonly(self):
a = Exporter((2,), 'h', readonly=True)
self.assertTrue(a.readonly)
b = Importer(a, PyBUF_STRIDED_RO)
self.assertRaises(BufferError, Importer, a, PyBUF_STRIDED)
b = Importer(a, PyBUF_STRIDED_RO)
def test_is_contiguous(self):
a = Exporter((10,), '=h')
self.assertTrue(a.is_contiguous('C'))
self.assertTrue(a.is_contiguous('F'))
self.assertTrue(a.is_contiguous('A'))
a = Exporter((10, 4), '=h')
self.assertTrue(a.is_contiguous('C'))
self.assertTrue(a.is_contiguous('A'))
self.assertFalse(a.is_contiguous('F'))
a = Exporter((13, 5, 11, 3), '=h', (330, 66, 6, 2))
self.assertTrue(a.is_contiguous('C'))
self.assertTrue(a.is_contiguous('A'))
self.assertFalse(a.is_contiguous('F'))
a = Exporter((10, 4), '=h', (2, 20))
self.assertTrue(a.is_contiguous('F'))
self.assertTrue(a.is_contiguous('A'))
self.assertFalse(a.is_contiguous('C'))
a = Exporter((13, 5, 11, 3), '=h', (2, 26, 130, 1430))
self.assertTrue(a.is_contiguous('F'))
self.assertTrue(a.is_contiguous('A'))
self.assertFalse(a.is_contiguous('C'))
a = Exporter((2, 11, 6, 4), '=h', (576, 48, 8, 2))
self.assertFalse(a.is_contiguous('A'))
a = Exporter((2, 11, 6, 4), '=h', (2, 4, 48, 288))
self.assertFalse(a.is_contiguous('A'))
a = Exporter((3, 2, 2), '=h', (16, 8, 4))
self.assertFalse(a.is_contiguous('A'))
a = Exporter((3, 2, 2), '=h', (4, 12, 24))
self.assertFalse(a.is_contiguous('A'))
def test_PyBUF_flags(self):
a = Exporter((10, 2), 'd')
b = Importer(a, PyBUF_SIMPLE)
self.assertTrue(b.obj is a)
self.assertTrue(b.format is None)
self.assertEqual(b.len, a.len)
self.assertEqual(b.itemsize, a.itemsize)
self.assertTrue(b.shape is None)
self.assertTrue(b.strides is None)
self.assertTrue(b.suboffsets is None)
self.assertTrue(b.internal is None)
self.assertFalse(b.readonly)
b = Importer(a, PyBUF_WRITABLE)
self.assertTrue(b.obj is a)
self.assertTrue(b.format is None)
self.assertEqual(b.len, a.len)
self.assertEqual(b.itemsize, a.itemsize)
self.assertTrue(b.shape is None)
self.assertTrue(b.strides is None)
self.assertTrue(b.suboffsets is None)
self.assertTrue(b.internal is None)
self.assertFalse(b.readonly)
b = Importer(a, PyBUF_ND)
self.assertTrue(b.obj is a)
self.assertTrue(b.format is None)
self.assertEqual(b.len, a.len)
self.assertEqual(b.itemsize, a.itemsize)
self.assertEqual(b.shape, a.shape)
self.assertTrue(b.strides is None)
self.assertTrue(b.suboffsets is None)
self.assertTrue(b.internal is None)
self.assertFalse(b.readonly)
a = Exporter((5, 10), '=h', (24, 2))
b = Importer(a, PyBUF_STRIDES)
self.assertTrue(b.obj is a)
self.assertTrue(b.format is None)
self.assertEqual(b.len, a.len)
self.assertEqual(b.itemsize, a.itemsize)
self.assertEqual(b.shape, a.shape)
self.assertEqual(b.strides, a.strides)
self.assertTrue(b.suboffsets is None)
self.assertTrue(b.internal is None)
self.assertFalse(b.readonly)
b = Importer(a, PyBUF_FULL)
self.assertTrue(b.obj is a)
self.assertEqual(b.format, '=h')
self.assertEqual(b.len, a.len)
self.assertEqual(b.itemsize, a.itemsize)
self.assertEqual(b.shape, a.shape)
self.assertEqual(b.strides, a.strides)
self.assertTrue(b.suboffsets is None)
self.assertTrue(b.internal is None)
self.assertFalse(b.readonly)
self.assertRaises(BufferError, Importer, a, PyBUF_SIMPLE)
self.assertRaises(BufferError, Importer, a, PyBUF_WRITABLE)
self.assertRaises(BufferError, Importer, a, PyBUF_ND)
self.assertRaises(BufferError, Importer, a, PyBUF_C_CONTIGUOUS)
self.assertRaises(BufferError, Importer, a, PyBUF_F_CONTIGUOUS)
self.assertRaises(BufferError, Importer, a, PyBUF_ANY_CONTIGUOUS)
self.assertRaises(BufferError, Importer, a, PyBUF_CONTIG)
def test_negative_strides(self):
self.check_args(3, (3, 5, 4), 'B', (20, 4, -1), 60, 60, 1, 3)
self.check_args(3, (3, 5, 3), 'B', (20, 4, -1), 45, 60, 1, 2)
self.check_args(3, (3, 5, 4), 'B', (20, -4, 1), 60, 60, 1, 16)
self.check_args(3, (3, 5, 4), 'B', (-20, -4, -1), 60, 60, 1, 59)
self.check_args(3, (3, 5, 3), 'B', (-20, -4, -1), 45, 60, 1, 58)
def test_attributes(self):
a = Exporter((13, 5, 11, 3), '=h', (440, 88, 8, 2))
self.assertEqual(a.ndim, 4)
self.assertEqual(a.itemsize, 2)
self.assertFalse(a.readonly)
self.assertEqual(a.shape, (13, 5, 11, 3))
self.assertEqual(a.format, '=h')
self.assertEqual(a.strides, (440, 88, 8, 2))
self.assertEqual(a.len, 4290)
self.assertEqual(a.buflen, 5720)
self.assertEqual(a.buf, ctypes.addressof(a._buf))
a = Exporter((8,))
self.assertEqual(a.ndim, 1)
self.assertEqual(a.itemsize, 1)
self.assertFalse(a.readonly)
self.assertEqual(a.shape, (8,))
self.assertEqual(a.format, 'B')
self.assertTrue(isinstance(a.strides, tuple))
self.assertEqual(a.strides, (1,))
self.assertEqual(a.len, 8)
self.assertEqual(a.buflen, 8)
a = Exporter([13, 5, 11, 3], '=h', [440, 88, 8, 2])
self.assertTrue(isinstance(a.shape, tuple))
self.assertTrue(isinstance(a.strides, tuple))
self.assertEqual(a.shape, (13, 5, 11, 3))
self.assertEqual(a.strides, (440, 88, 8, 2))
def test_itemsize(self):
exp = Exporter((4, 5), format='B', itemsize=8)
imp = Importer(exp, PyBUF_RECORDS)
self.assertEqual(imp.itemsize, 8)
self.assertEqual(imp.format, 'B')
self.assertEqual(imp.strides, (40, 8))
exp = Exporter((4, 5), format='weird', itemsize=5)
imp = Importer(exp, PyBUF_RECORDS)
self.assertEqual(imp.itemsize, 5)
self.assertEqual(imp.format, 'weird')
self.assertEqual(imp.strides, (25, 5))
def check_args(self, call_flags,
shape, format, strides, length, bufsize, itemsize,
offset=0):
format_arg = format if call_flags & 1 else None
strides_arg = strides if call_flags & 2 else None
a = Exporter(shape, format_arg, strides_arg)
self.assertEqual(a.buflen, bufsize)
self.assertEqual(a.buf, ctypes.addressof(a._buf) + offset)
m = Importer(a, PyBUF_RECORDS_RO)
self.assertEqual(m.buf, a.buf)
self.assertEqual(m.len, length)
self.assertEqual(m.format, format)
self.assertEqual(m.itemsize, itemsize)
self.assertEqual(m.shape, shape)
self.assertEqual(m.strides, strides)
if __name__ == '__main__':
unittest.main()