757 lines
31 KiB
Python
757 lines
31 KiB
Python
from collections import abc
|
|
import array
|
|
import math
|
|
import operator
|
|
import unittest
|
|
import struct
|
|
import sys
|
|
|
|
from test import support
|
|
|
|
ISBIGENDIAN = sys.byteorder == "big"
|
|
|
|
integer_codes = 'b', 'B', 'h', 'H', 'i', 'I', 'l', 'L', 'q', 'Q', 'n', 'N'
|
|
byteorders = '', '@', '=', '<', '>', '!'
|
|
|
|
def iter_integer_formats(byteorders=byteorders):
|
|
for code in integer_codes:
|
|
for byteorder in byteorders:
|
|
if (byteorder not in ('', '@') and code in ('n', 'N')):
|
|
continue
|
|
yield code, byteorder
|
|
|
|
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((TypeError, struct.error), struct.pack, 'i', 'foo')
|
|
self.assertRaises((TypeError, 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', b'a', b'a', b'a', 0),
|
|
('xc', b'a', b'\0a', b'\0a', 0),
|
|
('cx', b'a', b'a\0', b'a\0', 0),
|
|
('s', b'a', b'a', b'a', 0),
|
|
('0s', b'helloworld', b'', b'', 1),
|
|
('1s', b'helloworld', b'h', b'h', 1),
|
|
('9s', b'helloworld', b'helloworl', b'helloworl', 1),
|
|
('10s', b'helloworld', b'helloworld', b'helloworld', 0),
|
|
('11s', b'helloworld', b'helloworld\0', b'helloworld\0', 1),
|
|
('20s', b'helloworld', b'helloworld'+10*b'\0', b'helloworld'+10*b'\0', 1),
|
|
('b', 7, b'\7', b'\7', 0),
|
|
('b', -7, b'\371', b'\371', 0),
|
|
('B', 7, b'\7', b'\7', 0),
|
|
('B', 249, b'\371', b'\371', 0),
|
|
('h', 700, b'\002\274', b'\274\002', 0),
|
|
('h', -700, b'\375D', b'D\375', 0),
|
|
('H', 700, b'\002\274', b'\274\002', 0),
|
|
('H', 0x10000-700, b'\375D', b'D\375', 0),
|
|
('i', 70000000, b'\004,\035\200', b'\200\035,\004', 0),
|
|
('i', -70000000, b'\373\323\342\200', b'\200\342\323\373', 0),
|
|
('I', 70000000, b'\004,\035\200', b'\200\035,\004', 0),
|
|
('I', 0x100000000-70000000, b'\373\323\342\200', b'\200\342\323\373', 0),
|
|
('l', 70000000, b'\004,\035\200', b'\200\035,\004', 0),
|
|
('l', -70000000, b'\373\323\342\200', b'\200\342\323\373', 0),
|
|
('L', 70000000, b'\004,\035\200', b'\200\035,\004', 0),
|
|
('L', 0x100000000-70000000, b'\373\323\342\200', b'\200\342\323\373', 0),
|
|
('f', 2.0, b'@\000\000\000', b'\000\000\000@', 0),
|
|
('d', 2.0, b'@\000\000\000\000\000\000\000',
|
|
b'\000\000\000\000\000\000\000@', 0),
|
|
('f', -2.0, b'\300\000\000\000', b'\000\000\000\300', 0),
|
|
('d', -2.0, b'\300\000\000\000\000\000\000\000',
|
|
b'\000\000\000\000\000\000\000\300', 0),
|
|
('?', 0, b'\0', b'\0', 0),
|
|
('?', 3, b'\1', b'\1', 1),
|
|
('?', True, b'\1', b'\1', 0),
|
|
('?', [], b'\0', b'\0', 1),
|
|
('?', (1,), b'\1', b'\1', 1),
|
|
]
|
|
|
|
for fmt, arg, big, lil, asy in tests:
|
|
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 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, byteorder in iter_integer_formats(('=', '<', '>', '!')):
|
|
format = byteorder+code
|
|
size = struct.calcsize(format)
|
|
self.assertEqual(size, expected_size[code])
|
|
|
|
# native integer sizes
|
|
native_pairs = 'bB', 'hH', 'iI', 'lL', 'nN', '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'))
|
|
self.assertLessEqual(8, struct.calcsize('q'))
|
|
self.assertLessEqual(struct.calcsize('l'), struct.calcsize('q'))
|
|
self.assertGreaterEqual(struct.calcsize('n'), struct.calcsize('i'))
|
|
self.assertGreaterEqual(struct.calcsize('n'), struct.calcsize('P'))
|
|
|
|
def test_integers(self):
|
|
# Integer tests (bBhHiIlLqQnN).
|
|
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('bhilqn'):
|
|
self.signed = True
|
|
self.min_value = -(2**(self.bitsize-1))
|
|
self.max_value = 2**(self.bitsize-1) - 1
|
|
elif self.code in tuple('BHILQN'):
|
|
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 = expected.encode('ascii')
|
|
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((OverflowError, ValueError, 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
|
|
|
|
# Objects with an '__index__' method should be allowed
|
|
# to pack as integers. That is assuming the implemented
|
|
# '__index__' method returns an 'int'.
|
|
class Indexable(object):
|
|
def __init__(self, value):
|
|
self._value = value
|
|
|
|
def __index__(self):
|
|
return self._value
|
|
|
|
# If the '__index__' method raises a type error, then
|
|
# '__int__' should be used with a deprecation warning.
|
|
class BadIndex(object):
|
|
def __index__(self):
|
|
raise TypeError
|
|
|
|
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())
|
|
self.assertRaises((TypeError, struct.error),
|
|
struct.pack, self.format,
|
|
BadIndex())
|
|
|
|
# Check for legitimate values from '__index__'.
|
|
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")
|
|
|
|
# Check for bogus values from '__index__'.
|
|
for obj in (Indexable(b'a'), Indexable('b'), Indexable(None),
|
|
Indexable({'a': 1}), Indexable([1, 2, 3])):
|
|
self.assertRaises((TypeError, struct.error),
|
|
struct.pack, self.format,
|
|
obj)
|
|
|
|
for code, byteorder in iter_integer_formats():
|
|
format = byteorder+code
|
|
t = IntTester(format)
|
|
t.run()
|
|
|
|
def test_nN_code(self):
|
|
# n and N don't exist in standard sizes
|
|
def assertStructError(func, *args, **kwargs):
|
|
with self.assertRaises(struct.error) as cm:
|
|
func(*args, **kwargs)
|
|
self.assertIn("bad char in struct format", str(cm.exception))
|
|
for code in 'nN':
|
|
for byteorder in ('=', '<', '>', '!'):
|
|
format = byteorder+code
|
|
assertStructError(struct.calcsize, format)
|
|
assertStructError(struct.pack, format, 0)
|
|
assertStructError(struct.unpack, format, b"")
|
|
|
|
def test_p_code(self):
|
|
# Test p ("Pascal string") code.
|
|
for code, input, expected, expectedback in [
|
|
('p', b'abc', b'\x00', b''),
|
|
('1p', b'abc', b'\x00', b''),
|
|
('2p', b'abc', b'\x01a', b'a'),
|
|
('3p', b'abc', b'\x02ab', b'ab'),
|
|
('4p', b'abc', b'\x03abc', b'abc'),
|
|
('5p', b'abc', b'\x03abc\x00', b'abc'),
|
|
('6p', b'abc', b'\x03abc\x00\x00', b'abc'),
|
|
('1000p', b'x'*1000, b'\xff' + b'x'*999, b'x'*255)]:
|
|
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" and ">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.
|
|
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)
|
|
unpacked = struct.unpack("<f", packed)[0]
|
|
# This failed at base = 2, 4, and 32, with unpacked = 1, 2, and
|
|
# 16, respectively.
|
|
self.assertEqual(base, unpacked)
|
|
bigpacked = 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 code, byteorder in iter_integer_formats():
|
|
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)
|
|
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), (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)
|
|
|
|
# keyword arguments
|
|
self.assertEqual(s.unpack_from(buffer=test_string, offset=2),
|
|
(b'cd01',))
|
|
|
|
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.tobytes()[:len(test_string)]
|
|
self.assertEqual(from_buf, test_string)
|
|
|
|
# Test with offset.
|
|
s.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), 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 OSError
|
|
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 OSError:
|
|
pass
|
|
else:
|
|
self.fail("Expected OSError: 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)
|
|
|
|
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 check_sizeof(self, format_str, number_of_codes):
|
|
# The size of 'PyStructObject'
|
|
totalsize = support.calcobjsize('2n3P')
|
|
# The size taken up by the 'formatcode' dynamic array
|
|
totalsize += struct.calcsize('P3n0P') * (number_of_codes + 1)
|
|
support.check_sizeof(self, struct.Struct(format_str), totalsize)
|
|
|
|
@support.cpython_only
|
|
def test__sizeof__(self):
|
|
for code in integer_codes:
|
|
self.check_sizeof(code, 1)
|
|
self.check_sizeof('BHILfdspP', 9)
|
|
self.check_sizeof('B' * 1234, 1234)
|
|
self.check_sizeof('fd', 2)
|
|
self.check_sizeof('xxxxxxxxxxxxxx', 0)
|
|
self.check_sizeof('100H', 1)
|
|
self.check_sizeof('187s', 1)
|
|
self.check_sizeof('20p', 1)
|
|
self.check_sizeof('0s', 1)
|
|
self.check_sizeof('0c', 0)
|
|
|
|
|
|
class UnpackIteratorTest(unittest.TestCase):
|
|
"""
|
|
Tests for iterative unpacking (struct.Struct.iter_unpack).
|
|
"""
|
|
|
|
def test_construct(self):
|
|
def _check_iterator(it):
|
|
self.assertIsInstance(it, abc.Iterator)
|
|
self.assertIsInstance(it, abc.Iterable)
|
|
s = struct.Struct('>ibcp')
|
|
it = s.iter_unpack(b"")
|
|
_check_iterator(it)
|
|
it = s.iter_unpack(b"1234567")
|
|
_check_iterator(it)
|
|
# Wrong bytes length
|
|
with self.assertRaises(struct.error):
|
|
s.iter_unpack(b"123456")
|
|
with self.assertRaises(struct.error):
|
|
s.iter_unpack(b"12345678")
|
|
# Zero-length struct
|
|
s = struct.Struct('>')
|
|
with self.assertRaises(struct.error):
|
|
s.iter_unpack(b"")
|
|
with self.assertRaises(struct.error):
|
|
s.iter_unpack(b"12")
|
|
|
|
def test_iterate(self):
|
|
s = struct.Struct('>IB')
|
|
b = bytes(range(1, 16))
|
|
it = s.iter_unpack(b)
|
|
self.assertEqual(next(it), (0x01020304, 5))
|
|
self.assertEqual(next(it), (0x06070809, 10))
|
|
self.assertEqual(next(it), (0x0b0c0d0e, 15))
|
|
self.assertRaises(StopIteration, next, it)
|
|
self.assertRaises(StopIteration, next, it)
|
|
|
|
def test_arbitrary_buffer(self):
|
|
s = struct.Struct('>IB')
|
|
b = bytes(range(1, 11))
|
|
it = s.iter_unpack(memoryview(b))
|
|
self.assertEqual(next(it), (0x01020304, 5))
|
|
self.assertEqual(next(it), (0x06070809, 10))
|
|
self.assertRaises(StopIteration, next, it)
|
|
self.assertRaises(StopIteration, next, it)
|
|
|
|
def test_length_hint(self):
|
|
lh = operator.length_hint
|
|
s = struct.Struct('>IB')
|
|
b = bytes(range(1, 16))
|
|
it = s.iter_unpack(b)
|
|
self.assertEqual(lh(it), 3)
|
|
next(it)
|
|
self.assertEqual(lh(it), 2)
|
|
next(it)
|
|
self.assertEqual(lh(it), 1)
|
|
next(it)
|
|
self.assertEqual(lh(it), 0)
|
|
self.assertRaises(StopIteration, next, it)
|
|
self.assertEqual(lh(it), 0)
|
|
|
|
def test_module_func(self):
|
|
# Sanity check for the global struct.iter_unpack()
|
|
it = struct.iter_unpack('>IB', bytes(range(1, 11)))
|
|
self.assertEqual(next(it), (0x01020304, 5))
|
|
self.assertEqual(next(it), (0x06070809, 10))
|
|
self.assertRaises(StopIteration, next, it)
|
|
self.assertRaises(StopIteration, next, it)
|
|
|
|
def test_half_float(self):
|
|
# Little-endian examples from:
|
|
# http://en.wikipedia.org/wiki/Half_precision_floating-point_format
|
|
format_bits_float__cleanRoundtrip_list = [
|
|
(b'\x00\x3c', 1.0),
|
|
(b'\x00\xc0', -2.0),
|
|
(b'\xff\x7b', 65504.0), # (max half precision)
|
|
(b'\x00\x04', 2**-14), # ~= 6.10352 * 10**-5 (min pos normal)
|
|
(b'\x01\x00', 2**-24), # ~= 5.96046 * 10**-8 (min pos subnormal)
|
|
(b'\x00\x00', 0.0),
|
|
(b'\x00\x80', -0.0),
|
|
(b'\x00\x7c', float('+inf')),
|
|
(b'\x00\xfc', float('-inf')),
|
|
(b'\x55\x35', 0.333251953125), # ~= 1/3
|
|
]
|
|
|
|
for le_bits, f in format_bits_float__cleanRoundtrip_list:
|
|
be_bits = le_bits[::-1]
|
|
self.assertEqual(f, struct.unpack('<e', le_bits)[0])
|
|
self.assertEqual(le_bits, struct.pack('<e', f))
|
|
self.assertEqual(f, struct.unpack('>e', be_bits)[0])
|
|
self.assertEqual(be_bits, struct.pack('>e', f))
|
|
if sys.byteorder == 'little':
|
|
self.assertEqual(f, struct.unpack('e', le_bits)[0])
|
|
self.assertEqual(le_bits, struct.pack('e', f))
|
|
else:
|
|
self.assertEqual(f, struct.unpack('e', be_bits)[0])
|
|
self.assertEqual(be_bits, struct.pack('e', f))
|
|
|
|
# Check for NaN handling:
|
|
format_bits__nan_list = [
|
|
('<e', b'\x01\xfc'),
|
|
('<e', b'\x00\xfe'),
|
|
('<e', b'\xff\xff'),
|
|
('<e', b'\x01\x7c'),
|
|
('<e', b'\x00\x7e'),
|
|
('<e', b'\xff\x7f'),
|
|
]
|
|
|
|
for formatcode, bits in format_bits__nan_list:
|
|
self.assertTrue(math.isnan(struct.unpack('<e', bits)[0]))
|
|
self.assertTrue(math.isnan(struct.unpack('>e', bits[::-1])[0]))
|
|
|
|
# Check that packing produces a bit pattern representing a quiet NaN:
|
|
# all exponent bits and the msb of the fraction should all be 1.
|
|
packed = struct.pack('<e', math.nan)
|
|
self.assertEqual(packed[1] & 0x7e, 0x7e)
|
|
packed = struct.pack('<e', -math.nan)
|
|
self.assertEqual(packed[1] & 0x7e, 0x7e)
|
|
|
|
# Checks for round-to-even behavior
|
|
format_bits_float__rounding_list = [
|
|
('>e', b'\x00\x01', 2.0**-25 + 2.0**-35), # Rounds to minimum subnormal
|
|
('>e', b'\x00\x00', 2.0**-25), # Underflows to zero (nearest even mode)
|
|
('>e', b'\x00\x00', 2.0**-26), # Underflows to zero
|
|
('>e', b'\x03\xff', 2.0**-14 - 2.0**-24), # Largest subnormal.
|
|
('>e', b'\x03\xff', 2.0**-14 - 2.0**-25 - 2.0**-65),
|
|
('>e', b'\x04\x00', 2.0**-14 - 2.0**-25),
|
|
('>e', b'\x04\x00', 2.0**-14), # Smallest normal.
|
|
('>e', b'\x3c\x01', 1.0+2.0**-11 + 2.0**-16), # rounds to 1.0+2**(-10)
|
|
('>e', b'\x3c\x00', 1.0+2.0**-11), # rounds to 1.0 (nearest even mode)
|
|
('>e', b'\x3c\x00', 1.0+2.0**-12), # rounds to 1.0
|
|
('>e', b'\x7b\xff', 65504), # largest normal
|
|
('>e', b'\x7b\xff', 65519), # rounds to 65504
|
|
('>e', b'\x80\x01', -2.0**-25 - 2.0**-35), # Rounds to minimum subnormal
|
|
('>e', b'\x80\x00', -2.0**-25), # Underflows to zero (nearest even mode)
|
|
('>e', b'\x80\x00', -2.0**-26), # Underflows to zero
|
|
('>e', b'\xbc\x01', -1.0-2.0**-11 - 2.0**-16), # rounds to 1.0+2**(-10)
|
|
('>e', b'\xbc\x00', -1.0-2.0**-11), # rounds to 1.0 (nearest even mode)
|
|
('>e', b'\xbc\x00', -1.0-2.0**-12), # rounds to 1.0
|
|
('>e', b'\xfb\xff', -65519), # rounds to 65504
|
|
]
|
|
|
|
for formatcode, bits, f in format_bits_float__rounding_list:
|
|
self.assertEqual(bits, struct.pack(formatcode, f))
|
|
|
|
# This overflows, and so raises an error
|
|
format_bits_float__roundingError_list = [
|
|
# Values that round to infinity.
|
|
('>e', 65520.0),
|
|
('>e', 65536.0),
|
|
('>e', 1e300),
|
|
('>e', -65520.0),
|
|
('>e', -65536.0),
|
|
('>e', -1e300),
|
|
('<e', 65520.0),
|
|
('<e', 65536.0),
|
|
('<e', 1e300),
|
|
('<e', -65520.0),
|
|
('<e', -65536.0),
|
|
('<e', -1e300),
|
|
]
|
|
|
|
for formatcode, f in format_bits_float__roundingError_list:
|
|
self.assertRaises(OverflowError, struct.pack, formatcode, f)
|
|
|
|
# Double rounding
|
|
format_bits_float__doubleRoundingError_list = [
|
|
('>e', b'\x67\xff', 0x1ffdffffff * 2**-26), # should be 2047, if double-rounded 64>32>16, becomes 2048
|
|
]
|
|
|
|
for formatcode, bits, f in format_bits_float__doubleRoundingError_list:
|
|
self.assertEqual(bits, struct.pack(formatcode, f))
|
|
|
|
|
|
if __name__ == '__main__':
|
|
unittest.main()
|