mirror of https://github.com/python/cpython
580 lines
24 KiB
Python
580 lines
24 KiB
Python
import array
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import unittest
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import struct
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import sys
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from test.support import run_unittest
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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', 'n', 'N'
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byteorders = '', '@', '=', '<', '>', '!'
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def iter_integer_formats(byteorders=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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if (byteorder not in ('', '@') and code in ('n', 'N')):
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continue
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yield code, byteorder
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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 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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class StructTest(unittest.TestCase):
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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((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', 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', b'a', b'a', b'a', 0),
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('xc', b'a', b'\0a', b'\0a', 0),
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('cx', b'a', b'a\0', b'a\0', 0),
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('s', b'a', b'a', b'a', 0),
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('0s', b'helloworld', b'', b'', 1),
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('1s', b'helloworld', b'h', b'h', 1),
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('9s', b'helloworld', b'helloworl', b'helloworl', 1),
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('10s', b'helloworld', b'helloworld', b'helloworld', 0),
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('11s', b'helloworld', b'helloworld\0', b'helloworld\0', 1),
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('20s', b'helloworld', b'helloworld'+10*b'\0', b'helloworld'+10*b'\0', 1),
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('b', 7, b'\7', b'\7', 0),
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('b', -7, b'\371', b'\371', 0),
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('B', 7, b'\7', b'\7', 0),
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('B', 249, b'\371', b'\371', 0),
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('h', 700, b'\002\274', b'\274\002', 0),
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('h', -700, b'\375D', b'D\375', 0),
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('H', 700, b'\002\274', b'\274\002', 0),
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('H', 0x10000-700, b'\375D', b'D\375', 0),
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('i', 70000000, b'\004,\035\200', b'\200\035,\004', 0),
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('i', -70000000, b'\373\323\342\200', b'\200\342\323\373', 0),
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('I', 70000000, b'\004,\035\200', b'\200\035,\004', 0),
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('I', 0x100000000-70000000, b'\373\323\342\200', b'\200\342\323\373', 0),
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('l', 70000000, b'\004,\035\200', b'\200\035,\004', 0),
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('l', -70000000, b'\373\323\342\200', b'\200\342\323\373', 0),
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('L', 70000000, b'\004,\035\200', b'\200\035,\004', 0),
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('L', 0x100000000-70000000, b'\373\323\342\200', b'\200\342\323\373', 0),
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('f', 2.0, b'@\000\000\000', b'\000\000\000@', 0),
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('d', 2.0, b'@\000\000\000\000\000\000\000',
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b'\000\000\000\000\000\000\000@', 0),
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('f', -2.0, b'\300\000\000\000', b'\000\000\000\300', 0),
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('d', -2.0, b'\300\000\000\000\000\000\000\000',
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b'\000\000\000\000\000\000\000\300', 0),
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('?', 0, b'\0', b'\0', 0),
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('?', 3, b'\1', b'\1', 1),
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('?', True, b'\1', b'\1', 0),
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('?', [], b'\0', b'\0', 1),
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('?', (1,), b'\1', b'\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, byteorder in iter_integer_formats(('=', '<', '>', '!')):
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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
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native_pairs = 'bB', 'hH', 'iI', 'lL', 'nN'
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if HAVE_LONG_LONG:
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native_pairs += 'qQ',
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for format_pair in native_pairs:
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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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if HAVE_LONG_LONG:
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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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self.assertGreaterEqual(struct.calcsize('n'), struct.calcsize('i'))
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self.assertGreaterEqual(struct.calcsize('n'), struct.calcsize('P'))
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def test_integers(self):
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# Integer tests (bBhHiIlLqQnN).
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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.byteorder = format[:-1]
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if not self.byteorder in byteorders:
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raise ValueError("unrecognized packing byteorder: %s" %
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self.byteorder)
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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('bhilqn'):
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self.signed = True
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self.min_value = -(2**(self.bitsize-1))
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self.max_value = 2**(self.bitsize-1) - 1
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elif self.code in tuple('BHILQN'):
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self.signed = False
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self.min_value = 0
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self.max_value = 2**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 = x
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if self.signed and x < 0:
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expected += 1 << 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 = expected.encode('ascii')
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expected = unhexlify(expected)
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expected = (b"\x00" * (self.bytesize - len(expected)) +
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expected)
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if (self.byteorder == '<' or
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self.byteorder 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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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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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(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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# Values absorbed from other tests
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values.extend([300, 700000, sys.maxsize*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(x)
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# Some error cases.
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class NotAnInt:
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def __int__(self):
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return 42
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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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self.assertRaises((TypeError, struct.error),
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struct.pack, self.format,
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3+42j)
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self.assertRaises((TypeError, struct.error),
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struct.pack, self.format,
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NotAnInt())
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self.assertRaises((TypeError, struct.error),
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struct.pack, self.format,
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BadIndex())
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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(b'a'), Indexable('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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for code, byteorder in iter_integer_formats():
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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_nN_code(self):
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# n and N don't exist in standard sizes
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def assertStructError(func, *args, **kwargs):
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with self.assertRaises(struct.error) as cm:
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func(*args, **kwargs)
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self.assertIn("bad char in struct format", str(cm.exception))
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for code in 'nN':
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for byteorder in ('=', '<', '>', '!'):
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format = byteorder+code
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assertStructError(struct.calcsize, format)
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assertStructError(struct.pack, format, 0)
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assertStructError(struct.unpack, format, b"")
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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', b'abc', b'\x00', b''),
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('1p', b'abc', b'\x00', b''),
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('2p', b'abc', b'\x01a', b'a'),
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('3p', b'abc', b'\x02ab', b'ab'),
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('4p', b'abc', b'\x03abc', b'abc'),
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('5p', b'abc', b'\x03abc\x00', b'abc'),
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('6p', b'abc', b'\x03abc\x00\x00', b'abc'),
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('1000p', b'x'*1000, b'\xff' + b'x'*999, b'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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for code, byteorder in iter_integer_formats():
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format = byteorder + code
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self.assertRaises(struct.error, struct.pack, format, 1.0)
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self.assertRaises(struct.error, struct.pack, format, 1.5)
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self.assertRaises(struct.error, struct.pack, 'P', 1.0)
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self.assertRaises(struct.error, struct.pack, 'P', 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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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), (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.tobytes()[: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.tobytes()[:len(test_string)+10]
|
|
self.assertEqual(from_buf, test_string[:10] + test_string)
|
|
|
|
# Go beyond boundaries.
|
|
small_buf = array.array('b', b' '*10)
|
|
self.assertRaises((ValueError, struct.error), s.pack_into, small_buf, 0,
|
|
test_string)
|
|
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 = b'Reykjavik rocks, eow!'
|
|
writable_buf = array.array('b', b' '*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.tobytes()[:len(test_string)]
|
|
self.assertEqual(from_buf, test_string)
|
|
|
|
# Test with offset.
|
|
pack_into(writable_buf, 10, test_string)
|
|
from_buf = writable_buf.tobytes()[:len(test_string)+10]
|
|
self.assertEqual(from_buf, test_string[:10] + test_string)
|
|
|
|
# Go beyond boundaries.
|
|
small_buf = array.array('b', b' '*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):
|
|
# SF bug 1563759: struct.unpack doesn't support buffer protocol objects
|
|
data1 = array.array('B', b'\x12\x34\x56\x78')
|
|
data2 = memoryview(b'\x12\x34\x56\x78') # XXX b'......XXXX......', 6, 4
|
|
for data in [data1, data2]:
|
|
value, = struct.unpack('>I', data)
|
|
self.assertEqual(value, 0x12345678)
|
|
|
|
def test_bool(self):
|
|
class ExplodingBool(object):
|
|
def __bool__(self):
|
|
raise IOError
|
|
for prefix in tuple("<>!=")+('',):
|
|
false = (), [], [], '', 0
|
|
true = [1], 'test', 5, -1, 0xffffffff+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)
|
|
|
|
try:
|
|
struct.pack(prefix + '?', ExplodingBool())
|
|
except IOError:
|
|
pass
|
|
else:
|
|
self.fail("Expected IOError: struct.pack(%r, "
|
|
"ExplodingBool())" % (prefix + '?'))
|
|
|
|
for c in [b'\x01', b'\x7f', b'\xff', b'\x0f', b'\xf0']:
|
|
self.assertTrue(struct.unpack('>?', c)[0])
|
|
|
|
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)
|
|
|
|
if IS32BIT:
|
|
def test_crasher(self):
|
|
self.assertRaises(MemoryError, struct.pack, "357913941b", "a")
|
|
|
|
def test_trailing_counter(self):
|
|
store = array.array('b', b' '*100)
|
|
|
|
# format lists containing only count spec should result in an error
|
|
self.assertRaises(struct.error, struct.pack, '12345')
|
|
self.assertRaises(struct.error, struct.unpack, '12345', '')
|
|
self.assertRaises(struct.error, struct.pack_into, '12345', store, 0)
|
|
self.assertRaises(struct.error, struct.unpack_from, '12345', store, 0)
|
|
|
|
# Format lists with trailing count spec should result in an error
|
|
self.assertRaises(struct.error, struct.pack, 'c12345', 'x')
|
|
self.assertRaises(struct.error, struct.unpack, 'c12345', 'x')
|
|
self.assertRaises(struct.error, struct.pack_into, 'c12345', store, 0,
|
|
'x')
|
|
self.assertRaises(struct.error, struct.unpack_from, 'c12345', store,
|
|
0)
|
|
|
|
# Mixed format tests
|
|
self.assertRaises(struct.error, struct.pack, '14s42', 'spam and eggs')
|
|
self.assertRaises(struct.error, struct.unpack, '14s42',
|
|
'spam and eggs')
|
|
self.assertRaises(struct.error, struct.pack_into, '14s42', store, 0,
|
|
'spam and eggs')
|
|
self.assertRaises(struct.error, struct.unpack_from, '14s42', store, 0)
|
|
|
|
def test_Struct_reinitialization(self):
|
|
# Issue 9422: there was a memory leak when reinitializing a
|
|
# Struct instance. This test can be used to detect the leak
|
|
# when running with regrtest -L.
|
|
s = struct.Struct('i')
|
|
s.__init__('ii')
|
|
|
|
def test_main():
|
|
run_unittest(StructTest)
|
|
|
|
if __name__ == '__main__':
|
|
test_main()
|