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import unittest
from test import test_support
import struct
import sys
ISBIGENDIAN = sys.byteorder == "big"
class StructTests(unittest.TestCase): # (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', 70000000L, '\004,\035\200', '\200\035,\004', 0),
('I', 0x100000000L-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', 70000000L, '\004,\035\200', '\200\035,\004', 0),
('L', 0x100000000L-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),
]
def test_struct(self):
for fmt, arg, big, lil, asy in self._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,msg="pack(%r, %r) -> %r # expected %r" %
(fmt, arg, res, exp))
n=struct.calcsize(xfmt)
self.assertEqual(n, len(res),msg="calcsize(%r) -> %d # expected %d" %
(xfmt, n, len(res)))
rev = struct.unpack(xfmt, res)[0]
if asy:
self.assertNotEqual(arg,rev,msg="unpack(%r, %r) -> (%r,) # expected (%r,)" %
(fmt, res, rev, exp))
else:
self.assertEqual(arg,rev,msg="unpack(%r, %r) -> (%r,) # expected (%r,)" %
(fmt, res, rev, arg))
def test_struct_unpack_bytearray(self):
for fmt, arg, big, lil, asy in self._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,msg="pack(%r, %r) -> %r # expected %r" %
(fmt, arg, res, exp))
n=struct.calcsize(xfmt)
self.assertEqual(n, len(res),msg="calcsize(%r) -> %d # expected %d" %
(xfmt, n, len(res)))
rev = struct.unpack(xfmt, bytearray(res))[0]
if asy:
self.assertNotEqual(arg,rev,msg="unpack(%r, %r) -> (%r,) # expected (%r,)" %
(fmt, res, rev, exp))
else:
self.assertEqual(arg,rev,msg="unpack(%r, %r) -> (%r,) # expected (%r,)" %
(fmt, res, rev, arg))
def test_struct_unpack_buffer(self):
for fmt, arg, big, lil, asy in self._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,msg="pack(%r, %r) -> %r # expected %r" %
(fmt, arg, res, exp))
n=struct.calcsize(xfmt)
self.assertEqual(n, len(res),msg="calcsize(%r) -> %d # expected %d" %
(xfmt, n, len(res)))
rev = struct.unpack(xfmt, buffer(res))[0]
if asy:
self.assertNotEqual(arg,rev,msg="unpack(%r, %r) -> (%r,) # expected (%r,)" %
(fmt, res, rev, exp))
else:
self.assertEqual(arg,rev,msg="unpack(%r, %r) -> (%r,) # expected (%r,)" %
(fmt, res, rev, arg))
def test_struct_unpack_from(self):
for fmt, arg, big, lil, asy in self._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,msg="pack(%r, %r) -> %r # expected %r" %
(fmt, arg, res, exp))
n=struct.calcsize(xfmt)
self.assertEqual(n, len(res),msg="calcsize(%r) -> %d # expected %d" %
(xfmt, n, len(res)))
rev = struct.unpack_from(xfmt, res)[0]
if asy:
self.assertNotEqual(arg,rev,msg="unpack(%r, %r) -> (%r,) # expected (%r,)" %
(fmt, res, rev, exp))
else:
self.assertEqual(arg,rev,msg="unpack(%r, %r) -> (%r,) # expected (%r,)" %
(fmt, res, rev, arg))
def test_struct_unpack_from_bytearray(self):
for fmt, arg, big, lil, asy in self._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,msg="pack(%r, %r) -> %r # expected %r" %
(fmt, arg, res, exp))
n=struct.calcsize(xfmt)
self.assertEqual(n, len(res),msg="calcsize(%r) -> %d # expected %d" %
(xfmt, n, len(res)))
rev = struct.unpack_from(xfmt, bytearray(res))[0]
if asy:
self.assertNotEqual(arg,rev,msg="unpack(%r, %r) -> (%r,) # expected (%r,)" %
(fmt, res, rev, exp))
else:
self.assertEqual(arg,rev,msg="unpack(%r, %r) -> (%r,) # expected (%r,)" %
(fmt, res, rev, arg))
def test_struct_unpack_from_buffer(self):
for fmt, arg, big, lil, asy in self._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,msg="pack(%r, %r) -> %r # expected %r" %
(fmt, arg, res, exp))
n=struct.calcsize(xfmt)
self.assertEqual(n, len(res),msg="calcsize(%r) -> %d # expected %d" %
(xfmt, n, len(res)))
rev = struct.unpack_from(xfmt, buffer(res))[0]
if asy:
self.assertNotEqual(arg,rev,msg="unpack(%r, %r) -> (%r,) # expected (%r,)" %
(fmt, res, rev, exp))
else:
self.assertEqual(arg,rev,msg="unpack(%r, %r) -> (%r,) # expected (%r,)" %
(fmt, res, rev, arg))
def test_main():
test_support.run_unittest(__name__)
if __name__ == "__main__":
test_main()
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