cpython/Lib/test/test_marshal.py

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# -*- coding: iso-8859-1 -*-
from test import test_support
import marshal
import sys
import unittest
import os
try:
import _testcapi
except ImportError:
_testcapi = None
class IntTestCase(unittest.TestCase):
def test_ints(self):
# Test the full range of Python ints.
n = sys.maxint
while n:
for expected in (-n, n):
s = marshal.dumps(expected)
got = marshal.loads(s)
self.assertEqual(expected, got)
marshal.dump(expected, file(test_support.TESTFN, "wb"))
got = marshal.load(file(test_support.TESTFN, "rb"))
self.assertEqual(expected, got)
n = n >> 1
os.unlink(test_support.TESTFN)
def test_int64(self):
# Simulate int marshaling on a 64-bit box. This is most interesting if
# we're running the test on a 32-bit box, of course.
def to_little_endian_string(value, nbytes):
bytes = []
for i in range(nbytes):
bytes.append(chr(value & 0xff))
value >>= 8
return ''.join(bytes)
maxint64 = (1L << 63) - 1
minint64 = -maxint64-1
for base in maxint64, minint64, -maxint64, -(minint64 >> 1):
while base:
s = 'I' + to_little_endian_string(base, 8)
got = marshal.loads(s)
self.assertEqual(base, got)
if base == -1: # a fixed-point for shifting right 1
base = 0
else:
base >>= 1
def test_bool(self):
for b in (True, False):
new = marshal.loads(marshal.dumps(b))
self.assertEqual(b, new)
self.assertEqual(type(b), type(new))
marshal.dump(b, file(test_support.TESTFN, "wb"))
new = marshal.load(file(test_support.TESTFN, "rb"))
self.assertEqual(b, new)
self.assertEqual(type(b), type(new))
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class FloatTestCase(unittest.TestCase):
def test_floats(self):
# Test a few floats
small = 1e-25
n = sys.maxint * 3.7e250
while n > small:
for expected in (-n, n):
f = float(expected)
s = marshal.dumps(f)
got = marshal.loads(s)
self.assertEqual(f, got)
marshal.dump(f, file(test_support.TESTFN, "wb"))
got = marshal.load(file(test_support.TESTFN, "rb"))
self.assertEqual(f, got)
n /= 123.4567
f = 0.0
s = marshal.dumps(f, 2)
got = marshal.loads(s)
self.assertEqual(f, got)
# and with version <= 1 (floats marshalled differently then)
s = marshal.dumps(f, 1)
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got = marshal.loads(s)
self.assertEqual(f, got)
n = sys.maxint * 3.7e-250
while n < small:
for expected in (-n, n):
f = float(expected)
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s = marshal.dumps(f)
got = marshal.loads(s)
self.assertEqual(f, got)
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s = marshal.dumps(f, 1)
got = marshal.loads(s)
self.assertEqual(f, got)
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marshal.dump(f, file(test_support.TESTFN, "wb"))
got = marshal.load(file(test_support.TESTFN, "rb"))
self.assertEqual(f, got)
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marshal.dump(f, file(test_support.TESTFN, "wb"), 1)
got = marshal.load(file(test_support.TESTFN, "rb"))
self.assertEqual(f, got)
n *= 123.4567
os.unlink(test_support.TESTFN)
class StringTestCase(unittest.TestCase):
def test_unicode(self):
for s in [u"", u"Andr<EFBFBD> Previn", u"abc", u" "*10000]:
new = marshal.loads(marshal.dumps(s))
self.assertEqual(s, new)
self.assertEqual(type(s), type(new))
marshal.dump(s, file(test_support.TESTFN, "wb"))
new = marshal.load(file(test_support.TESTFN, "rb"))
self.assertEqual(s, new)
self.assertEqual(type(s), type(new))
os.unlink(test_support.TESTFN)
def test_string(self):
for s in ["", "Andr<EFBFBD> Previn", "abc", " "*10000]:
new = marshal.loads(marshal.dumps(s))
self.assertEqual(s, new)
self.assertEqual(type(s), type(new))
marshal.dump(s, file(test_support.TESTFN, "wb"))
new = marshal.load(file(test_support.TESTFN, "rb"))
self.assertEqual(s, new)
self.assertEqual(type(s), type(new))
os.unlink(test_support.TESTFN)
def test_buffer(self):
for s in ["", "Andr<EFBFBD> Previn", "abc", " "*10000]:
with test_support.check_py3k_warnings(("buffer.. not supported",
DeprecationWarning)):
b = buffer(s)
new = marshal.loads(marshal.dumps(b))
self.assertEqual(s, new)
marshal.dump(b, file(test_support.TESTFN, "wb"))
new = marshal.load(file(test_support.TESTFN, "rb"))
self.assertEqual(s, new)
os.unlink(test_support.TESTFN)
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class ExceptionTestCase(unittest.TestCase):
def test_exceptions(self):
new = marshal.loads(marshal.dumps(StopIteration))
self.assertEqual(StopIteration, new)
class CodeTestCase(unittest.TestCase):
def test_code(self):
co = ExceptionTestCase.test_exceptions.func_code
new = marshal.loads(marshal.dumps(co))
self.assertEqual(co, new)
class ContainerTestCase(unittest.TestCase):
d = {'astring': 'foo@bar.baz.spam',
'afloat': 7283.43,
'anint': 2**20,
'ashortlong': 2L,
'alist': ['.zyx.41'],
'atuple': ('.zyx.41',)*10,
'aboolean': False,
'aunicode': u"Andr<EFBFBD> Previn"
}
def test_dict(self):
new = marshal.loads(marshal.dumps(self.d))
self.assertEqual(self.d, new)
marshal.dump(self.d, file(test_support.TESTFN, "wb"))
new = marshal.load(file(test_support.TESTFN, "rb"))
self.assertEqual(self.d, new)
os.unlink(test_support.TESTFN)
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def test_list(self):
lst = self.d.items()
new = marshal.loads(marshal.dumps(lst))
self.assertEqual(lst, new)
marshal.dump(lst, file(test_support.TESTFN, "wb"))
new = marshal.load(file(test_support.TESTFN, "rb"))
self.assertEqual(lst, new)
os.unlink(test_support.TESTFN)
def test_tuple(self):
t = tuple(self.d.keys())
new = marshal.loads(marshal.dumps(t))
self.assertEqual(t, new)
marshal.dump(t, file(test_support.TESTFN, "wb"))
new = marshal.load(file(test_support.TESTFN, "rb"))
self.assertEqual(t, new)
os.unlink(test_support.TESTFN)
def test_sets(self):
for constructor in (set, frozenset):
t = constructor(self.d.keys())
new = marshal.loads(marshal.dumps(t))
self.assertEqual(t, new)
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self.assertTrue(isinstance(new, constructor))
self.assertNotEqual(id(t), id(new))
marshal.dump(t, file(test_support.TESTFN, "wb"))
new = marshal.load(file(test_support.TESTFN, "rb"))
self.assertEqual(t, new)
os.unlink(test_support.TESTFN)
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class BugsTestCase(unittest.TestCase):
def test_bug_5888452(self):
# Simple-minded check for SF 588452: Debug build crashes
marshal.dumps([128] * 1000)
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def test_patch_873224(self):
self.assertRaises(Exception, marshal.loads, '0')
self.assertRaises(Exception, marshal.loads, 'f')
self.assertRaises(Exception, marshal.loads, marshal.dumps(5L)[:-1])
def test_version_argument(self):
# Python 2.4.0 crashes for any call to marshal.dumps(x, y)
self.assertEqual(marshal.loads(marshal.dumps(5, 0)), 5)
self.assertEqual(marshal.loads(marshal.dumps(5, 1)), 5)
def test_fuzz(self):
# simple test that it's at least not *totally* trivial to
# crash from bad marshal data
for c in [chr(i) for i in range(256)]:
try:
marshal.loads(c)
except Exception:
pass
def test_loads_recursion(self):
def run_tests(N, check):
# (((...None...),),)
check(b'(\x01\x00\x00\x00' * N + b'N')
# [[[...None...]]]
check(b'[\x01\x00\x00\x00' * N + b'N')
# {None: {None: {None: ...None...}}}
check(b'{N' * N + b'N' + b'0' * N)
# frozenset([frozenset([frozenset([...None...])])])
check(b'>\x01\x00\x00\x00' * N + b'N')
# Check that the generated marshal data is valid and marshal.loads()
# works for moderately deep nesting
run_tests(100, marshal.loads)
# Very deeply nested structure shouldn't blow the stack
def check(s):
self.assertRaises(ValueError, marshal.loads, s)
run_tests(2**20, check)
def test_recursion_limit(self):
# Create a deeply nested structure.
head = last = []
# The max stack depth should match the value in Python/marshal.c.
if os.name == 'nt' and hasattr(sys, 'gettotalrefcount'):
MAX_MARSHAL_STACK_DEPTH = 1000
else:
MAX_MARSHAL_STACK_DEPTH = 2000
for i in range(MAX_MARSHAL_STACK_DEPTH - 2):
last.append([0])
last = last[-1]
# Verify we don't blow out the stack with dumps/load.
data = marshal.dumps(head)
new_head = marshal.loads(data)
# Don't use == to compare objects, it can exceed the recursion limit.
self.assertEqual(len(new_head), len(head))
self.assertEqual(len(new_head[0]), len(head[0]))
self.assertEqual(len(new_head[-1]), len(head[-1]))
last.append([0])
self.assertRaises(ValueError, marshal.dumps, head)
def test_exact_type_match(self):
# Former bug:
# >>> class Int(int): pass
# >>> type(loads(dumps(Int())))
# <type 'int'>
for typ in (int, long, float, complex, tuple, list, dict, set, frozenset):
# Note: str and unicode subclasses are not tested because they get handled
# by marshal's routines for objects supporting the buffer API.
subtyp = type('subtyp', (typ,), {})
self.assertRaises(ValueError, marshal.dumps, subtyp())
# Issue #1792 introduced a change in how marshal increases the size of its
# internal buffer; this test ensures that the new code is exercised.
def test_large_marshal(self):
size = int(1e6)
testString = 'abc' * size
marshal.dumps(testString)
def test_invalid_longs(self):
# Issue #7019: marshal.loads shouldn't produce unnormalized PyLongs
invalid_string = 'l\x02\x00\x00\x00\x00\x00\x00\x00'
self.assertRaises(ValueError, marshal.loads, invalid_string)
LARGE_SIZE = 2**31
character_size = 4 if sys.maxunicode > 0xFFFF else 2
pointer_size = 8 if sys.maxsize > 0xFFFFFFFF else 4
@unittest.skipIf(LARGE_SIZE > sys.maxsize, "test cannot run on 32-bit systems")
class LargeValuesTestCase(unittest.TestCase):
def check_unmarshallable(self, data):
f = open(test_support.TESTFN, 'wb')
self.addCleanup(test_support.unlink, test_support.TESTFN)
with f:
self.assertRaises(ValueError, marshal.dump, data, f)
@test_support.precisionbigmemtest(size=LARGE_SIZE, memuse=1, dry_run=False)
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def test_string(self, size):
self.check_unmarshallable('x' * size)
@test_support.precisionbigmemtest(size=LARGE_SIZE,
memuse=character_size + 2, dry_run=False)
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def test_unicode(self, size):
self.check_unmarshallable(u'x' * size)
@test_support.precisionbigmemtest(size=LARGE_SIZE,
memuse=pointer_size, dry_run=False)
def test_tuple(self, size):
self.check_unmarshallable((None,) * size)
@test_support.precisionbigmemtest(size=LARGE_SIZE,
memuse=pointer_size, dry_run=False)
def test_list(self, size):
self.check_unmarshallable([None] * size)
@test_support.precisionbigmemtest(size=LARGE_SIZE,
memuse=pointer_size*12 + sys.getsizeof(LARGE_SIZE-1),
dry_run=False)
def test_set(self, size):
self.check_unmarshallable(set(range(size)))
@test_support.precisionbigmemtest(size=LARGE_SIZE,
memuse=pointer_size*12 + sys.getsizeof(LARGE_SIZE-1),
dry_run=False)
def test_frozenset(self, size):
self.check_unmarshallable(frozenset(range(size)))
@test_support.precisionbigmemtest(size=LARGE_SIZE, memuse=1, dry_run=False)
def test_bytearray(self, size):
self.check_unmarshallable(bytearray(size))
@test_support.cpython_only
@unittest.skipUnless(_testcapi, 'requires _testcapi')
class CAPI_TestCase(unittest.TestCase):
def test_write_long_to_file(self):
for v in range(marshal.version + 1):
_testcapi.pymarshal_write_long_to_file(0x12345678, test_support.TESTFN, v)
with open(test_support.TESTFN, 'rb') as f:
data = f.read()
test_support.unlink(test_support.TESTFN)
self.assertEqual(data, b'\x78\x56\x34\x12')
def test_write_object_to_file(self):
obj = ('\u20ac', b'abc', 123, 45.6, 7+8j, 'long line '*1000)
for v in range(marshal.version + 1):
_testcapi.pymarshal_write_object_to_file(obj, test_support.TESTFN, v)
with open(test_support.TESTFN, 'rb') as f:
data = f.read()
test_support.unlink(test_support.TESTFN)
self.assertEqual(marshal.loads(data), obj)
def test_read_short_from_file(self):
with open(test_support.TESTFN, 'wb') as f:
f.write(b'\x34\x12xxxx')
r, p = _testcapi.pymarshal_read_short_from_file(test_support.TESTFN)
test_support.unlink(test_support.TESTFN)
self.assertEqual(r, 0x1234)
self.assertEqual(p, 2)
def test_read_long_from_file(self):
with open(test_support.TESTFN, 'wb') as f:
f.write(b'\x78\x56\x34\x12xxxx')
r, p = _testcapi.pymarshal_read_long_from_file(test_support.TESTFN)
test_support.unlink(test_support.TESTFN)
self.assertEqual(r, 0x12345678)
self.assertEqual(p, 4)
def test_read_last_object_from_file(self):
obj = ('\u20ac', b'abc', 123, 45.6, 7+8j)
for v in range(marshal.version + 1):
data = marshal.dumps(obj, v)
with open(test_support.TESTFN, 'wb') as f:
f.write(data + b'xxxx')
r, p = _testcapi.pymarshal_read_last_object_from_file(test_support.TESTFN)
test_support.unlink(test_support.TESTFN)
self.assertEqual(r, obj)
def test_read_object_from_file(self):
obj = ('\u20ac', b'abc', 123, 45.6, 7+8j)
for v in range(marshal.version + 1):
data = marshal.dumps(obj, v)
with open(test_support.TESTFN, 'wb') as f:
f.write(data + b'xxxx')
r, p = _testcapi.pymarshal_read_object_from_file(test_support.TESTFN)
test_support.unlink(test_support.TESTFN)
self.assertEqual(r, obj)
self.assertEqual(p, len(data))
def test_main():
test_support.run_unittest(IntTestCase,
FloatTestCase,
StringTestCase,
CodeTestCase,
ContainerTestCase,
ExceptionTestCase,
BugsTestCase,
LargeValuesTestCase,
CAPI_TestCase,
)
if __name__ == "__main__":
test_main()