552 lines
22 KiB
Python
552 lines
22 KiB
Python
import os
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import array
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import unittest
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import struct
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import inspect
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from test.test_support import run_unittest, check_warnings, check_py3k_warnings
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import sys
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ISBIGENDIAN = sys.byteorder == "big"
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IS32BIT = sys.maxsize == 0x7fffffff
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integer_codes = 'b', 'B', 'h', 'H', 'i', 'I', 'l', 'L', 'q', 'Q'
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testmod_filename = os.path.splitext(__file__)[0] + '.py'
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# Native 'q' packing isn't available on systems that don't have the C
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# long long type.
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try:
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struct.pack('q', 5)
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except struct.error:
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HAVE_LONG_LONG = False
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else:
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HAVE_LONG_LONG = True
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def string_reverse(s):
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return "".join(reversed(s))
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def bigendian_to_native(value):
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if ISBIGENDIAN:
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return value
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else:
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return string_reverse(value)
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class StructTest(unittest.TestCase):
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def check_float_coerce(self, format, number):
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# SF bug 1530559. struct.pack raises TypeError where it used
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# to convert.
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with check_warnings((".*integer argument expected, got float",
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DeprecationWarning)) as w:
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got = struct.pack(format, number)
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lineno = inspect.currentframe().f_lineno - 1
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self.assertEqual(w.filename, testmod_filename)
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self.assertEqual(w.lineno, lineno)
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self.assertEqual(len(w.warnings), 1)
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expected = struct.pack(format, int(number))
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self.assertEqual(got, expected)
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def test_isbigendian(self):
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self.assertEqual((struct.pack('=i', 1)[0] == chr(0)), ISBIGENDIAN)
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def test_consistence(self):
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self.assertRaises(struct.error, struct.calcsize, 'Z')
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sz = struct.calcsize('i')
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self.assertEqual(sz * 3, struct.calcsize('iii'))
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fmt = 'cbxxxxxxhhhhiillffd?'
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fmt3 = '3c3b18x12h6i6l6f3d3?'
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sz = struct.calcsize(fmt)
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sz3 = struct.calcsize(fmt3)
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self.assertEqual(sz * 3, sz3)
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self.assertRaises(struct.error, struct.pack, 'iii', 3)
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self.assertRaises(struct.error, struct.pack, 'i', 3, 3, 3)
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self.assertRaises((TypeError, struct.error), struct.pack, 'i', 'foo')
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self.assertRaises((TypeError, struct.error), struct.pack, 'P', 'foo')
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self.assertRaises(struct.error, struct.unpack, 'd', 'flap')
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s = struct.pack('ii', 1, 2)
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self.assertRaises(struct.error, struct.unpack, 'iii', s)
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self.assertRaises(struct.error, struct.unpack, 'i', s)
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def test_transitiveness(self):
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c = 'a'
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b = 1
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h = 255
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i = 65535
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l = 65536
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f = 3.1415
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d = 3.1415
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t = True
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for prefix in ('', '@', '<', '>', '=', '!'):
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for format in ('xcbhilfd?', 'xcBHILfd?'):
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format = prefix + format
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s = struct.pack(format, c, b, h, i, l, f, d, t)
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cp, bp, hp, ip, lp, fp, dp, tp = struct.unpack(format, s)
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self.assertEqual(cp, c)
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self.assertEqual(bp, b)
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self.assertEqual(hp, h)
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self.assertEqual(ip, i)
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self.assertEqual(lp, l)
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self.assertEqual(int(100 * fp), int(100 * f))
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self.assertEqual(int(100 * dp), int(100 * d))
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self.assertEqual(tp, t)
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def test_new_features(self):
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# Test some of the new features in detail
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# (format, argument, big-endian result, little-endian result, asymmetric)
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tests = [
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('c', 'a', 'a', 'a', 0),
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('xc', 'a', '\0a', '\0a', 0),
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('cx', 'a', 'a\0', 'a\0', 0),
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('s', 'a', 'a', 'a', 0),
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('0s', 'helloworld', '', '', 1),
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('1s', 'helloworld', 'h', 'h', 1),
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('9s', 'helloworld', 'helloworl', 'helloworl', 1),
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('10s', 'helloworld', 'helloworld', 'helloworld', 0),
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('11s', 'helloworld', 'helloworld\0', 'helloworld\0', 1),
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('20s', 'helloworld', 'helloworld'+10*'\0', 'helloworld'+10*'\0', 1),
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('b', 7, '\7', '\7', 0),
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('b', -7, '\371', '\371', 0),
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('B', 7, '\7', '\7', 0),
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('B', 249, '\371', '\371', 0),
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('h', 700, '\002\274', '\274\002', 0),
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('h', -700, '\375D', 'D\375', 0),
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('H', 700, '\002\274', '\274\002', 0),
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('H', 0x10000-700, '\375D', 'D\375', 0),
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('i', 70000000, '\004,\035\200', '\200\035,\004', 0),
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('i', -70000000, '\373\323\342\200', '\200\342\323\373', 0),
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('I', 70000000L, '\004,\035\200', '\200\035,\004', 0),
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('I', 0x100000000L-70000000, '\373\323\342\200', '\200\342\323\373', 0),
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('l', 70000000, '\004,\035\200', '\200\035,\004', 0),
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('l', -70000000, '\373\323\342\200', '\200\342\323\373', 0),
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('L', 70000000L, '\004,\035\200', '\200\035,\004', 0),
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('L', 0x100000000L-70000000, '\373\323\342\200', '\200\342\323\373', 0),
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('f', 2.0, '@\000\000\000', '\000\000\000@', 0),
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('d', 2.0, '@\000\000\000\000\000\000\000',
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'\000\000\000\000\000\000\000@', 0),
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('f', -2.0, '\300\000\000\000', '\000\000\000\300', 0),
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('d', -2.0, '\300\000\000\000\000\000\000\000',
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'\000\000\000\000\000\000\000\300', 0),
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('?', 0, '\0', '\0', 0),
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('?', 3, '\1', '\1', 1),
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('?', True, '\1', '\1', 0),
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('?', [], '\0', '\0', 1),
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('?', (1,), '\1', '\1', 1),
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]
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for fmt, arg, big, lil, asy in tests:
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for (xfmt, exp) in [('>'+fmt, big), ('!'+fmt, big), ('<'+fmt, lil),
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('='+fmt, ISBIGENDIAN and big or lil)]:
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res = struct.pack(xfmt, arg)
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self.assertEqual(res, exp)
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self.assertEqual(struct.calcsize(xfmt), len(res))
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rev = struct.unpack(xfmt, res)[0]
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if rev != arg:
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self.assertTrue(asy)
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def test_calcsize(self):
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expected_size = {
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'b': 1, 'B': 1,
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'h': 2, 'H': 2,
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'i': 4, 'I': 4,
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'l': 4, 'L': 4,
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'q': 8, 'Q': 8,
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}
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# standard integer sizes
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for code in integer_codes:
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for byteorder in ('=', '<', '>', '!'):
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format = byteorder+code
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size = struct.calcsize(format)
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self.assertEqual(size, expected_size[code])
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# native integer sizes, except 'q' and 'Q'
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for format_pair in ('bB', 'hH', 'iI', 'lL'):
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for byteorder in ['', '@']:
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signed_size = struct.calcsize(byteorder + format_pair[0])
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unsigned_size = struct.calcsize(byteorder + format_pair[1])
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self.assertEqual(signed_size, unsigned_size)
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# bounds for native integer sizes
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self.assertEqual(struct.calcsize('b'), 1)
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self.assertLessEqual(2, struct.calcsize('h'))
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self.assertLessEqual(4, struct.calcsize('l'))
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self.assertLessEqual(struct.calcsize('h'), struct.calcsize('i'))
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self.assertLessEqual(struct.calcsize('i'), struct.calcsize('l'))
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# tests for native 'q' and 'Q' when applicable
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if HAVE_LONG_LONG:
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self.assertEqual(struct.calcsize('q'), struct.calcsize('Q'))
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self.assertLessEqual(8, struct.calcsize('q'))
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self.assertLessEqual(struct.calcsize('l'), struct.calcsize('q'))
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def test_integers(self):
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# Integer tests (bBhHiIlLqQ).
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import binascii
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class IntTester(unittest.TestCase):
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def __init__(self, format):
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super(IntTester, self).__init__(methodName='test_one')
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self.format = format
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self.code = format[-1]
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self.direction = format[:-1]
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if not self.direction in ('', '@', '=', '<', '>', '!'):
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raise ValueError("unrecognized packing direction: %s" %
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self.direction)
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self.bytesize = struct.calcsize(format)
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self.bitsize = self.bytesize * 8
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if self.code in tuple('bhilq'):
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self.signed = True
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self.min_value = -(2L**(self.bitsize-1))
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self.max_value = 2L**(self.bitsize-1) - 1
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elif self.code in tuple('BHILQ'):
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self.signed = False
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self.min_value = 0
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self.max_value = 2L**self.bitsize - 1
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else:
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raise ValueError("unrecognized format code: %s" %
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self.code)
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def test_one(self, x, pack=struct.pack,
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unpack=struct.unpack,
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unhexlify=binascii.unhexlify):
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format = self.format
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if self.min_value <= x <= self.max_value:
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expected = long(x)
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if self.signed and x < 0:
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expected += 1L << self.bitsize
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self.assertGreaterEqual(expected, 0)
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expected = '%x' % expected
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if len(expected) & 1:
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expected = "0" + expected
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expected = unhexlify(expected)
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expected = ("\x00" * (self.bytesize - len(expected)) +
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expected)
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if (self.direction == '<' or
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self.direction in ('', '@', '=') and not ISBIGENDIAN):
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expected = string_reverse(expected)
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self.assertEqual(len(expected), self.bytesize)
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# Pack work?
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got = pack(format, x)
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self.assertEqual(got, expected)
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# Unpack work?
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retrieved = unpack(format, got)[0]
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self.assertEqual(x, retrieved)
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# Adding any byte should cause a "too big" error.
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self.assertRaises((struct.error, TypeError), unpack, format,
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'\x01' + got)
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else:
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# x is out of range -- verify pack realizes that.
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self.assertRaises((OverflowError, ValueError, struct.error),
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pack, format, x)
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def run(self):
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from random import randrange
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# Create all interesting powers of 2.
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values = []
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for exp in range(self.bitsize + 3):
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values.append(1L << exp)
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# Add some random values.
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for i in range(self.bitsize):
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val = 0L
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for j in range(self.bytesize):
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val = (val << 8) | randrange(256)
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values.append(val)
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# Values absorbed from other tests
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values.extend([300, 700000, sys.maxint*4])
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# Try all those, and their negations, and +-1 from
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# them. Note that this tests all power-of-2
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# boundaries in range, and a few out of range, plus
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# +-(2**n +- 1).
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for base in values:
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for val in -base, base:
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for incr in -1, 0, 1:
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x = val + incr
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self.test_one(int(x))
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self.test_one(long(x))
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# Some error cases.
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class NotAnIntNS(object):
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def __int__(self):
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return 42
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def __long__(self):
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return 1729L
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class NotAnIntOS:
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def __int__(self):
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return 85
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def __long__(self):
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return -163L
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# Objects with an '__index__' method should be allowed
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# to pack as integers. That is assuming the implemented
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# '__index__' method returns and 'int' or 'long'.
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class Indexable(object):
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def __init__(self, value):
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self._value = value
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def __index__(self):
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return self._value
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# If the '__index__' method raises a type error, then
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# '__int__' should be used with a deprecation warning.
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class BadIndex(object):
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def __index__(self):
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raise TypeError
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def __int__(self):
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return 42
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self.assertRaises((TypeError, struct.error),
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struct.pack, self.format,
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"a string")
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self.assertRaises((TypeError, struct.error),
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struct.pack, self.format,
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randrange)
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with check_warnings(("integer argument expected, "
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"got non-integer", DeprecationWarning)):
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with self.assertRaises((TypeError, struct.error)):
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struct.pack(self.format, 3+42j)
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# an attempt to convert a non-integer (with an
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# implicit conversion via __int__) should succeed,
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# with a DeprecationWarning
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for nonint in NotAnIntNS(), NotAnIntOS(), BadIndex():
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with check_warnings((".*integer argument expected, got non"
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"-integer", DeprecationWarning)) as w:
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got = struct.pack(self.format, nonint)
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lineno = inspect.currentframe().f_lineno - 1
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self.assertEqual(w.filename, testmod_filename)
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self.assertEqual(w.lineno, lineno)
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self.assertEqual(len(w.warnings), 1)
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expected = struct.pack(self.format, int(nonint))
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self.assertEqual(got, expected)
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# Check for legitimate values from '__index__'.
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for obj in (Indexable(0), Indexable(10), Indexable(17),
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Indexable(42), Indexable(100), Indexable(127)):
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try:
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struct.pack(format, obj)
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except:
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self.fail("integer code pack failed on object "
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"with '__index__' method")
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# Check for bogus values from '__index__'.
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for obj in (Indexable('a'), Indexable(u'b'), Indexable(None),
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Indexable({'a': 1}), Indexable([1, 2, 3])):
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self.assertRaises((TypeError, struct.error),
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struct.pack, self.format,
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obj)
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byteorders = '', '@', '=', '<', '>', '!'
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for code in integer_codes:
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for byteorder in byteorders:
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if (byteorder in ('', '@') and code in ('q', 'Q') and
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not HAVE_LONG_LONG):
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continue
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format = byteorder+code
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t = IntTester(format)
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t.run()
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def test_p_code(self):
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# Test p ("Pascal string") code.
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for code, input, expected, expectedback in [
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('p','abc', '\x00', ''),
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('1p', 'abc', '\x00', ''),
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('2p', 'abc', '\x01a', 'a'),
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('3p', 'abc', '\x02ab', 'ab'),
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('4p', 'abc', '\x03abc', 'abc'),
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('5p', 'abc', '\x03abc\x00', 'abc'),
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('6p', 'abc', '\x03abc\x00\x00', 'abc'),
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('1000p', 'x'*1000, '\xff' + 'x'*999, 'x'*255)]:
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got = struct.pack(code, input)
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self.assertEqual(got, expected)
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(got,) = struct.unpack(code, got)
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self.assertEqual(got, expectedback)
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def test_705836(self):
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# SF bug 705836. "<f" and ">f" had a severe rounding bug, where a carry
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# from the low-order discarded bits could propagate into the exponent
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# field, causing the result to be wrong by a factor of 2.
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import math
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for base in range(1, 33):
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# smaller <- largest representable float less than base.
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delta = 0.5
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while base - delta / 2.0 != base:
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delta /= 2.0
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smaller = base - delta
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# Packing this rounds away a solid string of trailing 1 bits.
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packed = struct.pack("<f", smaller)
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unpacked = struct.unpack("<f", packed)[0]
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# This failed at base = 2, 4, and 32, with unpacked = 1, 2, and
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# 16, respectively.
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self.assertEqual(base, unpacked)
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bigpacked = struct.pack(">f", smaller)
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self.assertEqual(bigpacked, string_reverse(packed))
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unpacked = struct.unpack(">f", bigpacked)[0]
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self.assertEqual(base, unpacked)
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# Largest finite IEEE single.
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big = (1 << 24) - 1
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big = math.ldexp(big, 127 - 23)
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packed = struct.pack(">f", big)
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unpacked = struct.unpack(">f", packed)[0]
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self.assertEqual(big, unpacked)
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# The same, but tack on a 1 bit so it rounds up to infinity.
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big = (1 << 25) - 1
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big = math.ldexp(big, 127 - 24)
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self.assertRaises(OverflowError, struct.pack, ">f", big)
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def test_1530559(self):
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# SF bug 1530559. struct.pack raises TypeError where it used to convert.
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for endian in ('', '>', '<'):
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for fmt in integer_codes:
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self.check_float_coerce(endian + fmt, 1.0)
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self.check_float_coerce(endian + fmt, 1.5)
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def test_unpack_from(self, cls=str):
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data = cls('abcd01234')
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fmt = '4s'
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s = struct.Struct(fmt)
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self.assertEqual(s.unpack_from(data), ('abcd',))
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self.assertEqual(struct.unpack_from(fmt, data), ('abcd',))
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for i in xrange(6):
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self.assertEqual(s.unpack_from(data, i), (data[i:i+4],))
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self.assertEqual(struct.unpack_from(fmt, data, i), (data[i:i+4],))
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for i in xrange(6, len(data) + 1):
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self.assertRaises(struct.error, s.unpack_from, data, i)
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self.assertRaises(struct.error, struct.unpack_from, fmt, data, i)
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def test_pack_into(self):
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test_string = 'Reykjavik rocks, eow!'
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writable_buf = array.array('c', ' '*100)
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fmt = '21s'
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s = struct.Struct(fmt)
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# Test without offset
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s.pack_into(writable_buf, 0, test_string)
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from_buf = writable_buf.tostring()[:len(test_string)]
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self.assertEqual(from_buf, test_string)
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# Test with offset.
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s.pack_into(writable_buf, 10, test_string)
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from_buf = writable_buf.tostring()[:len(test_string)+10]
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self.assertEqual(from_buf, test_string[:10] + test_string)
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# Go beyond boundaries.
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small_buf = array.array('c', ' '*10)
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self.assertRaises((ValueError, struct.error), s.pack_into, small_buf, 0,
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test_string)
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|
self.assertRaises((ValueError, struct.error), s.pack_into, small_buf, 2,
|
|
test_string)
|
|
|
|
# Test bogus offset (issue 3694)
|
|
sb = small_buf
|
|
self.assertRaises((TypeError, struct.error), struct.pack_into, b'', sb,
|
|
None)
|
|
|
|
def test_pack_into_fn(self):
|
|
test_string = 'Reykjavik rocks, eow!'
|
|
writable_buf = array.array('c', ' '*100)
|
|
fmt = '21s'
|
|
pack_into = lambda *args: struct.pack_into(fmt, *args)
|
|
|
|
# Test without offset.
|
|
pack_into(writable_buf, 0, test_string)
|
|
from_buf = writable_buf.tostring()[:len(test_string)]
|
|
self.assertEqual(from_buf, test_string)
|
|
|
|
# Test with offset.
|
|
pack_into(writable_buf, 10, test_string)
|
|
from_buf = writable_buf.tostring()[:len(test_string)+10]
|
|
self.assertEqual(from_buf, test_string[:10] + test_string)
|
|
|
|
# Go beyond boundaries.
|
|
small_buf = array.array('c', ' '*10)
|
|
self.assertRaises((ValueError, struct.error), pack_into, small_buf, 0,
|
|
test_string)
|
|
self.assertRaises((ValueError, struct.error), pack_into, small_buf, 2,
|
|
test_string)
|
|
|
|
def test_unpack_with_buffer(self):
|
|
with check_py3k_warnings(("buffer.. not supported in 3.x",
|
|
DeprecationWarning)):
|
|
# SF bug 1563759: struct.unpack doesn't support buffer protocol objects
|
|
data1 = array.array('B', '\x12\x34\x56\x78')
|
|
data2 = buffer('......\x12\x34\x56\x78......', 6, 4)
|
|
for data in [data1, data2]:
|
|
value, = struct.unpack('>I', data)
|
|
self.assertEqual(value, 0x12345678)
|
|
|
|
self.test_unpack_from(cls=buffer)
|
|
|
|
def test_bool(self):
|
|
class ExplodingBool(object):
|
|
def __nonzero__(self):
|
|
raise IOError
|
|
for prefix in tuple("<>!=")+('',):
|
|
false = (), [], [], '', 0
|
|
true = [1], 'test', 5, -1, 0xffffffffL+1, 0xffffffff//2
|
|
|
|
falseFormat = prefix + '?' * len(false)
|
|
packedFalse = struct.pack(falseFormat, *false)
|
|
unpackedFalse = struct.unpack(falseFormat, packedFalse)
|
|
|
|
trueFormat = prefix + '?' * len(true)
|
|
packedTrue = struct.pack(trueFormat, *true)
|
|
unpackedTrue = struct.unpack(trueFormat, packedTrue)
|
|
|
|
self.assertEqual(len(true), len(unpackedTrue))
|
|
self.assertEqual(len(false), len(unpackedFalse))
|
|
|
|
for t in unpackedFalse:
|
|
self.assertFalse(t)
|
|
for t in unpackedTrue:
|
|
self.assertTrue(t)
|
|
|
|
packed = struct.pack(prefix+'?', 1)
|
|
|
|
self.assertEqual(len(packed), struct.calcsize(prefix+'?'))
|
|
|
|
if len(packed) != 1:
|
|
self.assertFalse(prefix, msg='encoded bool is not one byte: %r'
|
|
%packed)
|
|
|
|
self.assertRaises(IOError, struct.pack, prefix + '?',
|
|
ExplodingBool())
|
|
|
|
for c in [b'\x01', b'\x7f', b'\xff', b'\x0f', b'\xf0']:
|
|
self.assertTrue(struct.unpack('>?', c)[0])
|
|
|
|
@unittest.skipUnless(IS32BIT, "Specific to 32bit machines")
|
|
def test_crasher(self):
|
|
self.assertRaises(MemoryError, struct.pack, "357913941c", "a")
|
|
|
|
def test_count_overflow(self):
|
|
hugecount = '{}b'.format(sys.maxsize+1)
|
|
self.assertRaises(struct.error, struct.calcsize, hugecount)
|
|
|
|
hugecount2 = '{}b{}H'.format(sys.maxsize//2, sys.maxsize//2)
|
|
self.assertRaises(struct.error, struct.calcsize, hugecount2)
|
|
|
|
def test_main():
|
|
run_unittest(StructTest)
|
|
|
|
if __name__ == '__main__':
|
|
test_main()
|