592 lines
24 KiB
Python
592 lines
24 KiB
Python
import array
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import unittest
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import struct
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import warnings
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from functools import wraps
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from test.support import TestFailed, verbose, run_unittest
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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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del sys
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try:
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import _struct
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except ImportError:
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PY_STRUCT_RANGE_CHECKING = 0
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PY_STRUCT_FLOAT_COERCE = 2
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else:
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PY_STRUCT_RANGE_CHECKING = getattr(_struct, '_PY_STRUCT_RANGE_CHECKING', 0)
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PY_STRUCT_FLOAT_COERCE = getattr(_struct, '_PY_STRUCT_FLOAT_COERCE', 0)
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def string_reverse(s):
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return s[::-1]
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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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def with_warning_restore(func):
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@wraps(func)
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def decorator(*args, **kw):
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with warnings.catch_warnings():
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# We need this function to warn every time, so stick an
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# unqualifed 'always' at the head of the filter list
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warnings.simplefilter("always")
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warnings.filterwarnings("error", category=DeprecationWarning)
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return func(*args, **kw)
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return decorator
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@with_warning_restore
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def deprecated_err(func, *args):
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try:
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func(*args)
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except (struct.error, OverflowError):
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pass
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except DeprecationWarning:
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raise TestFailed("%s%s expected to raise DeprecationWarning" % (
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func.__name__, args))
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else:
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raise TestFailed("%s%s did not raise error" % (
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func.__name__, args))
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class StructTest(unittest.TestCase):
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@with_warning_restore
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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 to convert.
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if PY_STRUCT_FLOAT_COERCE == 2:
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# Test for pre-2.5 struct module
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packed = struct.pack(format, number)
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floored = struct.unpack(format, packed)[0]
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self.assertEqual(floored, int(number),
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"did not correcly coerce float to int")
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return
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try:
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struct.pack(format, number)
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except (struct.error, TypeError):
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if PY_STRUCT_FLOAT_COERCE:
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self.fail("expected DeprecationWarning for float coerce")
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except DeprecationWarning:
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if not PY_STRUCT_FLOAT_COERCE:
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self.fail("expected to raise struct.error for float coerce")
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else:
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self.fail("did not raise error for float coerce")
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def test_isbigendian(self):
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self.assertEqual((struct.pack('=i', 1)[0] == 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(struct.error, struct.pack, 'i', 'foo')
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self.assertRaises(struct.error, struct.pack, 'P', 'foo')
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self.assertRaises(struct.error, struct.unpack, 'd', b'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 = b'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', 70000000, '\004,\035\200', '\200\035,\004', 0),
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('I', 0x100000000-70000000, '\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', 70000000, '\004,\035\200', '\200\035,\004', 0),
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('L', 0x100000000-70000000, '\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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big = bytes(big, "latin-1")
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lil = bytes(lil, "latin-1")
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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 isinstance(arg, str):
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# Strings are returned as bytes since you can't know the
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# encoding of the string when packed.
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arg = bytes(arg, 'latin1')
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if rev != arg:
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self.assert_(asy)
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def test_native_qQ(self):
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# can't pack -1 as unsigned regardless
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self.assertRaises((struct.error, OverflowError), struct.pack, "Q", -1)
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# can't pack string as 'q' regardless
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self.assertRaises(struct.error, struct.pack, "q", "a")
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# ditto, but 'Q'
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self.assertRaises(struct.error, struct.pack, "Q", "a")
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try:
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struct.pack("q", 5)
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except struct.error:
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# does not have native q/Q
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pass
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else:
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nbytes = struct.calcsize('q')
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# The expected values here are in big-endian format, primarily
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# because I'm on a little-endian machine and so this is the
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# clearest way (for me) to force the code to get exercised.
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for format, input, expected in (
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('q', -1, '\xff' * nbytes),
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('q', 0, '\x00' * nbytes),
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('Q', 0, '\x00' * nbytes),
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('q', 1, '\x00' * (nbytes-1) + '\x01'),
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('Q', (1 << (8*nbytes))-1, '\xff' * nbytes),
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('q', (1 << (8*nbytes-1))-1, '\x7f' + '\xff' * (nbytes - 1))):
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expected = bytes(expected, "latin-1")
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got = struct.pack(format, input)
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native_expected = bigendian_to_native(expected)
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self.assertEqual(got, native_expected)
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retrieved = struct.unpack(format, got)[0]
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self.assertEqual(retrieved, input)
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def test_standard_integers(self):
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# Standard integer tests (bBhHiIlLqQ).
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import binascii
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class IntTester(unittest.TestCase):
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# XXX Most std integer modes fail to test for out-of-range.
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# The "i" and "l" codes appear to range-check OK on 32-bit boxes, but
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# fail to check correctly on some 64-bit ones (Tru64 Unix + Compaq C
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# reported by Mark Favas).
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BUGGY_RANGE_CHECK = "bBhHiIlL"
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def __init__(self, formatpair, bytesize):
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self.assertEqual(len(formatpair), 2)
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self.formatpair = formatpair
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for direction in "<>!=":
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for code in formatpair:
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format = direction + code
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self.assertEqual(struct.calcsize(format), bytesize)
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self.bytesize = bytesize
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self.bitsize = bytesize * 8
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self.signed_code, self.unsigned_code = formatpair
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self.unsigned_min = 0
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self.unsigned_max = 2**self.bitsize - 1
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self.signed_min = -(2**(self.bitsize-1))
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self.signed_max = 2**(self.bitsize-1) - 1
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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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# Try signed.
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code = self.signed_code
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if self.signed_min <= x <= self.signed_max:
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# Try big-endian.
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expected = x
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if x < 0:
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expected += 1 << self.bitsize
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self.assert_(expected > 0)
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expected = hex(expected)[2:] # chop "0x"
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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 = b"\x00" * (self.bytesize - len(expected)) + expected
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# Pack work?
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format = ">" + code
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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),
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unpack, format, b'\x01' + got)
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# Try little-endian.
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format = "<" + code
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expected = string_reverse(expected)
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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),
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unpack, format, b'\x01' + got)
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else:
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# x is out of range -- verify pack realizes that.
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if not PY_STRUCT_RANGE_CHECKING and code in self.BUGGY_RANGE_CHECK:
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if verbose:
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print("Skipping buggy range check for code", code)
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else:
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deprecated_err(pack, ">" + code, x)
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deprecated_err(pack, "<" + code, x)
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# Much the same for unsigned.
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code = self.unsigned_code
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if self.unsigned_min <= x <= self.unsigned_max:
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# Try big-endian.
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format = ">" + code
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expected = x
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expected = hex(expected)[2:] # chop "0x"
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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 = b"\x00" * (self.bytesize - len(expected)) + expected
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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),
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unpack, format, b'\x01' + got)
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# Try little-endian.
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format = "<" + code
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expected = string_reverse(expected)
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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),
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unpack, format, b'\x01' + got)
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else:
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# x is out of range -- verify pack realizes that.
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if not PY_STRUCT_RANGE_CHECKING and code in self.BUGGY_RANGE_CHECK:
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if verbose:
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print("Skipping buggy range check for code", code)
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else:
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deprecated_err(pack, ">" + code, x)
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deprecated_err(pack, "<" + code, 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(1 << exp)
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# Add some random values.
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for i in range(self.bitsize):
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val = 0
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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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# Try all those, and their negations, and +-1 from them. Note
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# that this tests all power-of-2 boundaries in range, and a few out
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# of range, plus +-(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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try:
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x = int(x)
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except OverflowError:
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pass
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self.test_one(x)
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# Some error cases.
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for direction in "<>":
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for code in self.formatpair:
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for badobject in "a string", 3+42j, randrange:
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self.assertRaises((struct.error, TypeError),
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struct.pack, direction + code,
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badobject)
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for args in [("bB", 1),
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("hH", 2),
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("iI", 4),
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("lL", 4),
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("qQ", 8)]:
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t = IntTester(*args)
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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', b''),
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('1p', 'abc', '\x00', b''),
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('2p', 'abc', '\x01a', b'a'),
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('3p', 'abc', '\x02ab', b'ab'),
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('4p', 'abc', '\x03abc', b'abc'),
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('5p', 'abc', '\x03abc\x00', b'abc'),
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('6p', 'abc', '\x03abc\x00\x00', b'abc'),
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('1000p', 'x'*1000, '\xff' + 'x'*999, b'x'*255)]:
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expected = bytes(expected, "latin-1")
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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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if PY_STRUCT_RANGE_CHECKING:
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def test_1229380(self):
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# SF bug 1229380. No struct.pack exception for some out of
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# range integers
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import sys
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for endian in ('', '>', '<'):
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for fmt in ('B', 'H', 'I', 'L'):
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deprecated_err(struct.pack, endian + fmt, -1)
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deprecated_err(struct.pack, endian + 'B', 300)
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deprecated_err(struct.pack, endian + 'H', 70000)
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deprecated_err(struct.pack, endian + 'I', sys.maxsize * 4)
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deprecated_err(struct.pack, endian + 'L', sys.maxsize * 4)
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def XXXtest_1530559(self):
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# XXX This is broken: see the bug report
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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 ('B', 'H', 'I', 'L', 'b', 'h', 'i', 'l'):
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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):
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test_string = b'abcd01234'
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fmt = '4s'
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s = struct.Struct(fmt)
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for cls in (bytes, bytearray):
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data = cls(test_string)
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if not isinstance(data, (bytes, bytearray)):
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bytes_data = bytes(data, 'latin1')
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else:
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bytes_data = data
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self.assertEqual(s.unpack_from(data), (b'abcd',))
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self.assertEqual(s.unpack_from(data, 2), (b'cd01',))
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self.assertEqual(s.unpack_from(data, 4), (b'0123',))
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for i in range(6):
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self.assertEqual(s.unpack_from(data, i), (bytes_data[i:i+4],))
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for i in range(6, len(test_string) + 1):
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self.assertRaises(struct.error, s.unpack_from, data, i)
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for cls in (bytes, bytearray):
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data = cls(test_string)
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self.assertEqual(struct.unpack_from(fmt, data), (b'abcd',))
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self.assertEqual(struct.unpack_from(fmt, data, 2), (b'cd01',))
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self.assertEqual(struct.unpack_from(fmt, data, 4), (b'0123',))
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for i in range(6):
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self.assertEqual(struct.unpack_from(fmt, data, i), (data[i:i+4],))
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for i in range(6, len(test_string) + 1):
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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 = b'Reykjavik rocks, eow!'
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writable_buf = array.array('b', b' '*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('b', b' '*10)
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self.assertRaises(struct.error, s.pack_into, small_buf, 0, test_string)
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self.assertRaises(struct.error, s.pack_into, small_buf, 2, test_string)
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# Test bogus offset (issue 3694)
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sb = small_buf
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self.assertRaises(TypeError, struct.pack_into, b'1', sb, None)
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def test_pack_into_fn(self):
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test_string = b'Reykjavik rocks, eow!'
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writable_buf = array.array('b', b' '*100)
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fmt = '21s'
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pack_into = lambda *args: struct.pack_into(fmt, *args)
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# Test without offset.
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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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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('b', b' '*10)
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self.assertRaises(struct.error, pack_into, small_buf, 0, test_string)
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self.assertRaises(struct.error, pack_into, small_buf, 2, test_string)
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def test_unpack_with_buffer(self):
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# SF bug 1563759: struct.unpack doens't support buffer protocol objects
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data1 = array.array('B', b'\x12\x34\x56\x78')
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data2 = memoryview(b'\x12\x34\x56\x78') # XXX b'......XXXX......', 6, 4
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for data in [data1, data2]:
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value, = struct.unpack('>I', data)
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self.assertEqual(value, 0x12345678)
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def test_bool(self):
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for prefix in tuple("<>!=")+('',):
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false = (), [], [], '', 0
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true = [1], 'test', 5, -1, 0xffffffff+1, 0xffffffff/2
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falseFormat = prefix + '?' * len(false)
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packedFalse = struct.pack(falseFormat, *false)
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unpackedFalse = struct.unpack(falseFormat, packedFalse)
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trueFormat = prefix + '?' * len(true)
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packedTrue = struct.pack(trueFormat, *true)
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unpackedTrue = struct.unpack(trueFormat, packedTrue)
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self.assertEqual(len(true), len(unpackedTrue))
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self.assertEqual(len(false), len(unpackedFalse))
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for t in unpackedFalse:
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self.assertFalse(t)
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for t in unpackedTrue:
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self.assertTrue(t)
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packed = struct.pack(prefix+'?', 1)
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self.assertEqual(len(packed), struct.calcsize(prefix+'?'))
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if len(packed) != 1:
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self.assertFalse(prefix, msg='encoded bool is not one byte: %r'
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%packed)
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for c in [b'\x01', b'\x7f', b'\xff', b'\x0f', b'\xf0']:
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self.assertTrue(struct.unpack('>?', c)[0])
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if IS32BIT:
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def test_crasher(self):
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self.assertRaises(MemoryError, struct.pack, "357913941b", "a")
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def test_main():
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run_unittest(StructTest)
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if __name__ == '__main__':
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test_main()
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