import array import unittest import struct import sys from test.support import run_unittest ISBIGENDIAN = sys.byteorder == "big" IS32BIT = sys.maxsize == 0x7fffffff integer_codes = 'b', 'B', 'h', 'H', 'i', 'I', 'l', 'L', 'q', 'Q' byteorders = '', '@', '=', '<', '>', '!' # Native 'q' packing isn't available on systems that don't have the C # long long type. try: struct.pack('q', 5) except struct.error: HAVE_LONG_LONG = False else: HAVE_LONG_LONG = True def string_reverse(s): return s[::-1] def bigendian_to_native(value): if ISBIGENDIAN: return value else: return string_reverse(value) class StructTest(unittest.TestCase): def test_isbigendian(self): self.assertEqual((struct.pack('=i', 1)[0] == 0), ISBIGENDIAN) def test_consistence(self): self.assertRaises(struct.error, struct.calcsize, 'Z') sz = struct.calcsize('i') self.assertEqual(sz * 3, struct.calcsize('iii')) fmt = 'cbxxxxxxhhhhiillffd?' fmt3 = '3c3b18x12h6i6l6f3d3?' sz = struct.calcsize(fmt) sz3 = struct.calcsize(fmt3) self.assertEqual(sz * 3, sz3) self.assertRaises(struct.error, struct.pack, 'iii', 3) self.assertRaises(struct.error, struct.pack, 'i', 3, 3, 3) self.assertRaises(struct.error, struct.pack, 'i', 'foo') self.assertRaises(struct.error, struct.pack, 'P', 'foo') self.assertRaises(struct.error, struct.unpack, 'd', b'flap') s = struct.pack('ii', 1, 2) self.assertRaises(struct.error, struct.unpack, 'iii', s) self.assertRaises(struct.error, struct.unpack, 'i', s) def test_transitiveness(self): c = b'a' b = 1 h = 255 i = 65535 l = 65536 f = 3.1415 d = 3.1415 t = True for prefix in ('', '@', '<', '>', '=', '!'): for format in ('xcbhilfd?', 'xcBHILfd?'): format = prefix + format s = struct.pack(format, c, b, h, i, l, f, d, t) cp, bp, hp, ip, lp, fp, dp, tp = struct.unpack(format, s) self.assertEqual(cp, c) self.assertEqual(bp, b) self.assertEqual(hp, h) self.assertEqual(ip, i) self.assertEqual(lp, l) self.assertEqual(int(100 * fp), int(100 * f)) self.assertEqual(int(100 * dp), int(100 * d)) self.assertEqual(tp, t) def test_new_features(self): # Test some of the new features in detail # (format, argument, big-endian result, little-endian result, asymmetric) tests = [ ('c', 'a', 'a', 'a', 0), ('xc', 'a', '\0a', '\0a', 0), ('cx', 'a', 'a\0', 'a\0', 0), ('s', 'a', 'a', 'a', 0), ('0s', 'helloworld', '', '', 1), ('1s', 'helloworld', 'h', 'h', 1), ('9s', 'helloworld', 'helloworl', 'helloworl', 1), ('10s', 'helloworld', 'helloworld', 'helloworld', 0), ('11s', 'helloworld', 'helloworld\0', 'helloworld\0', 1), ('20s', 'helloworld', 'helloworld'+10*'\0', 'helloworld'+10*'\0', 1), ('b', 7, '\7', '\7', 0), ('b', -7, '\371', '\371', 0), ('B', 7, '\7', '\7', 0), ('B', 249, '\371', '\371', 0), ('h', 700, '\002\274', '\274\002', 0), ('h', -700, '\375D', 'D\375', 0), ('H', 700, '\002\274', '\274\002', 0), ('H', 0x10000-700, '\375D', 'D\375', 0), ('i', 70000000, '\004,\035\200', '\200\035,\004', 0), ('i', -70000000, '\373\323\342\200', '\200\342\323\373', 0), ('I', 70000000, '\004,\035\200', '\200\035,\004', 0), ('I', 0x100000000-70000000, '\373\323\342\200', '\200\342\323\373', 0), ('l', 70000000, '\004,\035\200', '\200\035,\004', 0), ('l', -70000000, '\373\323\342\200', '\200\342\323\373', 0), ('L', 70000000, '\004,\035\200', '\200\035,\004', 0), ('L', 0x100000000-70000000, '\373\323\342\200', '\200\342\323\373', 0), ('f', 2.0, '@\000\000\000', '\000\000\000@', 0), ('d', 2.0, '@\000\000\000\000\000\000\000', '\000\000\000\000\000\000\000@', 0), ('f', -2.0, '\300\000\000\000', '\000\000\000\300', 0), ('d', -2.0, '\300\000\000\000\000\000\000\000', '\000\000\000\000\000\000\000\300', 0), ('?', 0, '\0', '\0', 0), ('?', 3, '\1', '\1', 1), ('?', True, '\1', '\1', 0), ('?', [], '\0', '\0', 1), ('?', (1,), '\1', '\1', 1), ] for fmt, arg, big, lil, asy in tests: big = bytes(big, "latin-1") lil = bytes(lil, "latin-1") for (xfmt, exp) in [('>'+fmt, big), ('!'+fmt, big), ('<'+fmt, lil), ('='+fmt, ISBIGENDIAN and big or lil)]: res = struct.pack(xfmt, arg) self.assertEqual(res, exp) self.assertEqual(struct.calcsize(xfmt), len(res)) rev = struct.unpack(xfmt, res)[0] if isinstance(arg, str): # Strings are returned as bytes since you can't know the # encoding of the string when packed. arg = bytes(arg, 'latin1') if rev != arg: self.assertTrue(asy) def test_calcsize(self): expected_size = { 'b': 1, 'B': 1, 'h': 2, 'H': 2, 'i': 4, 'I': 4, 'l': 4, 'L': 4, 'q': 8, 'Q': 8, } # standard integer sizes for code in integer_codes: for byteorder in '=', '<', '>', '!': format = byteorder+code size = struct.calcsize(format) self.assertEqual(size, expected_size[code]) # native integer sizes native_pairs = 'bB', 'hH', 'iI', 'lL' if HAVE_LONG_LONG: native_pairs += 'qQ', for format_pair in native_pairs: for byteorder in '', '@': signed_size = struct.calcsize(byteorder + format_pair[0]) unsigned_size = struct.calcsize(byteorder + format_pair[1]) self.assertEqual(signed_size, unsigned_size) # bounds for native integer sizes self.assertEqual(struct.calcsize('b'), 1) self.assertLessEqual(2, struct.calcsize('h')) self.assertLessEqual(4, struct.calcsize('l')) self.assertLessEqual(struct.calcsize('h'), struct.calcsize('i')) self.assertLessEqual(struct.calcsize('i'), struct.calcsize('l')) if HAVE_LONG_LONG: self.assertLessEqual(8, struct.calcsize('q')) self.assertLessEqual(struct.calcsize('l'), struct.calcsize('q')) def test_integers(self): # Integer tests (bBhHiIlLqQ). import binascii class IntTester(unittest.TestCase): def __init__(self, format): super(IntTester, self).__init__(methodName='test_one') self.format = format self.code = format[-1] self.byteorder = format[:-1] if not self.byteorder in byteorders: raise ValueError("unrecognized packing byteorder: %s" % self.byteorder) self.bytesize = struct.calcsize(format) self.bitsize = self.bytesize * 8 if self.code in tuple('bhilq'): self.signed = True self.min_value = -(2**(self.bitsize-1)) self.max_value = 2**(self.bitsize-1) - 1 elif self.code in tuple('BHILQ'): self.signed = False self.min_value = 0 self.max_value = 2**self.bitsize - 1 else: raise ValueError("unrecognized format code: %s" % self.code) def test_one(self, x, pack=struct.pack, unpack=struct.unpack, unhexlify=binascii.unhexlify): format = self.format if self.min_value <= x <= self.max_value: expected = x if self.signed and x < 0: expected += 1 << self.bitsize self.assertGreaterEqual(expected, 0) expected = '%x' % expected if len(expected) & 1: expected = "0" + expected expected = unhexlify(expected) expected = (b"\x00" * (self.bytesize - len(expected)) + expected) if (self.byteorder == '<' or self.byteorder in ('', '@', '=') and not ISBIGENDIAN): expected = string_reverse(expected) self.assertEqual(len(expected), self.bytesize) # Pack work? got = pack(format, x) self.assertEqual(got, expected) # Unpack work? retrieved = unpack(format, got)[0] self.assertEqual(x, retrieved) # Adding any byte should cause a "too big" error. self.assertRaises((struct.error, TypeError), unpack, format, b'\x01' + got) else: # x is out of range -- verify pack realizes that. self.assertRaises(struct.error, pack, format, x) def run(self): from random import randrange # Create all interesting powers of 2. values = [] for exp in range(self.bitsize + 3): values.append(1 << exp) # Add some random values. for i in range(self.bitsize): val = 0 for j in range(self.bytesize): val = (val << 8) | randrange(256) values.append(val) # Values absorbed from other tests values.extend([300, 700000, sys.maxsize*4]) # Try all those, and their negations, and +-1 from # them. Note that this tests all power-of-2 # boundaries in range, and a few out of range, plus # +-(2**n +- 1). for base in values: for val in -base, base: for incr in -1, 0, 1: x = val + incr self.test_one(x) # Some error cases. class NotAnInt: def __int__(self): return 42 self.assertRaises((TypeError, struct.error), struct.pack, self.format, "a string") self.assertRaises((TypeError, struct.error), struct.pack, self.format, randrange) self.assertRaises((TypeError, struct.error), struct.pack, self.format, 3+42j) self.assertRaises((TypeError, struct.error), struct.pack, self.format, NotAnInt) # Objects with an '__index__' method should be allowed # to pack as integers. class Indexable(object): def __init__(self, value): self._value = value def __index__(self): return self._value for obj in (Indexable(0), Indexable(10), Indexable(17), Indexable(42), Indexable(100), Indexable(127)): try: struct.pack(format, obj) except: self.fail("integer code pack failed on object " "with '__index__' method") for code in integer_codes: for byteorder in byteorders: if (byteorder in ('', '@') and code in ('q', 'Q') and not HAVE_LONG_LONG): continue format = byteorder+code t = IntTester(format) t.run() def test_p_code(self): # Test p ("Pascal string") code. for code, input, expected, expectedback in [ ('p','abc', '\x00', b''), ('1p', 'abc', '\x00', b''), ('2p', 'abc', '\x01a', b'a'), ('3p', 'abc', '\x02ab', b'ab'), ('4p', 'abc', '\x03abc', b'abc'), ('5p', 'abc', '\x03abc\x00', b'abc'), ('6p', 'abc', '\x03abc\x00\x00', b'abc'), ('1000p', 'x'*1000, '\xff' + 'x'*999, b'x'*255)]: expected = bytes(expected, "latin-1") got = struct.pack(code, input) self.assertEqual(got, expected) (got,) = struct.unpack(code, got) self.assertEqual(got, expectedback) def test_705836(self): # SF bug 705836. "f" had a severe rounding bug, where a carry # from the low-order discarded bits could propagate into the exponent # field, causing the result to be wrong by a factor of 2. import math for base in range(1, 33): # smaller <- largest representable float less than base. delta = 0.5 while base - delta / 2.0 != base: delta /= 2.0 smaller = base - delta # Packing this rounds away a solid string of trailing 1 bits. packed = struct.pack("f", smaller) self.assertEqual(bigpacked, string_reverse(packed)) unpacked = struct.unpack(">f", bigpacked)[0] self.assertEqual(base, unpacked) # Largest finite IEEE single. big = (1 << 24) - 1 big = math.ldexp(big, 127 - 23) packed = struct.pack(">f", big) unpacked = struct.unpack(">f", packed)[0] self.assertEqual(big, unpacked) # The same, but tack on a 1 bit so it rounds up to infinity. big = (1 << 25) - 1 big = math.ldexp(big, 127 - 24) self.assertRaises(OverflowError, struct.pack, ">f", big) def test_1530559(self): for byteorder in '', '@', '=', '<', '>', '!': for code in integer_codes: if (byteorder in ('', '@') and code in ('q', 'Q') and not HAVE_LONG_LONG): continue format = byteorder + code self.assertRaises(struct.error, struct.pack, format, 1.0) self.assertRaises(struct.error, struct.pack, format, 1.5) self.assertRaises(struct.error, struct.pack, 'P', 1.0) self.assertRaises(struct.error, struct.pack, 'P', 1.5) def test_unpack_from(self): test_string = b'abcd01234' fmt = '4s' s = struct.Struct(fmt) for cls in (bytes, bytearray): data = cls(test_string) if not isinstance(data, (bytes, bytearray)): bytes_data = bytes(data, 'latin1') else: bytes_data = data self.assertEqual(s.unpack_from(data), (b'abcd',)) self.assertEqual(s.unpack_from(data, 2), (b'cd01',)) self.assertEqual(s.unpack_from(data, 4), (b'0123',)) for i in range(6): self.assertEqual(s.unpack_from(data, i), (bytes_data[i:i+4],)) for i in range(6, len(test_string) + 1): self.assertRaises(struct.error, s.unpack_from, data, i) for cls in (bytes, bytearray): data = cls(test_string) self.assertEqual(struct.unpack_from(fmt, data), (b'abcd',)) self.assertEqual(struct.unpack_from(fmt, data, 2), (b'cd01',)) self.assertEqual(struct.unpack_from(fmt, data, 4), (b'0123',)) for i in range(6): self.assertEqual(struct.unpack_from(fmt, data, i), (data[i:i+4],)) for i in range(6, len(test_string) + 1): self.assertRaises(struct.error, struct.unpack_from, fmt, data, i) def test_pack_into(self): test_string = b'Reykjavik rocks, eow!' writable_buf = array.array('b', b' '*100) fmt = '21s' s = struct.Struct(fmt) # Test without offset s.pack_into(writable_buf, 0, test_string) from_buf = writable_buf.tostring()[:len(test_string)] self.assertEqual(from_buf, test_string) # Test with offset. s.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('b', b' '*10) self.assertRaises(struct.error, s.pack_into, small_buf, 0, test_string) self.assertRaises(struct.error, s.pack_into, small_buf, 2, test_string) # Test bogus offset (issue 3694) sb = small_buf self.assertRaises(TypeError, struct.pack_into, b'1', 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.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('b', b' '*10) self.assertRaises(struct.error, pack_into, small_buf, 0, test_string) self.assertRaises(struct.error, pack_into, small_buf, 2, test_string) def test_unpack_with_buffer(self): # SF bug 1563759: struct.unpack doens'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): 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) for c in [b'\x01', b'\x7f', b'\xff', b'\x0f', b'\xf0']: self.assertTrue(struct.unpack('>?', c)[0]) if IS32BIT: def test_crasher(self): self.assertRaises(MemoryError, struct.pack, "357913941b", "a") def test_main(): run_unittest(StructTest) if __name__ == '__main__': test_main()