import unittest
import sys
import test.support as support
from test.support import import_helper
# Skip this test if the _testcapi and _testlimitedcapi modules isn't available.
_testcapi = import_helper.import_module('_testcapi')
_testlimitedcapi = import_helper.import_module('_testlimitedcapi')
NULL = None
class IntSubclass(int):
pass
class Index:
def __init__(self, value):
self.value = value
def __index__(self):
return self.value
# use __index__(), not __int__()
class MyIndexAndInt:
def __index__(self):
return 10
def __int__(self):
return 22
class LongTests(unittest.TestCase):
def test_compact(self):
for n in {
# Edge cases
*(2**n for n in range(66)),
*(-2**n for n in range(66)),
*(2**n - 1 for n in range(66)),
*(-2**n + 1 for n in range(66)),
# Essentially random
*(37**n for n in range(14)),
*(-37**n for n in range(14)),
}:
with self.subTest(n=n):
is_compact, value = _testcapi.call_long_compact_api(n)
if is_compact:
self.assertEqual(n, value)
def test_compact_known(self):
# Sanity-check some implementation details (we don't guarantee
# that these are/aren't compact)
self.assertEqual(_testcapi.call_long_compact_api(-1), (True, -1))
self.assertEqual(_testcapi.call_long_compact_api(0), (True, 0))
self.assertEqual(_testcapi.call_long_compact_api(256), (True, 256))
self.assertEqual(_testcapi.call_long_compact_api(sys.maxsize),
(False, -1))
def test_long_check(self):
# Test PyLong_Check()
check = _testlimitedcapi.pylong_check
self.assertTrue(check(1))
self.assertTrue(check(123456789012345678901234567890))
self.assertTrue(check(-1))
self.assertTrue(check(True))
self.assertTrue(check(IntSubclass(1)))
self.assertFalse(check(1.0))
self.assertFalse(check(object()))
# CRASHES check(NULL)
def test_long_checkexact(self):
# Test PyLong_CheckExact()
check = _testlimitedcapi.pylong_checkexact
self.assertTrue(check(1))
self.assertTrue(check(123456789012345678901234567890))
self.assertTrue(check(-1))
self.assertFalse(check(True))
self.assertFalse(check(IntSubclass(1)))
self.assertFalse(check(1.0))
self.assertFalse(check(object()))
# CRASHES check(NULL)
def test_long_fromdouble(self):
# Test PyLong_FromDouble()
fromdouble = _testlimitedcapi.pylong_fromdouble
float_max = sys.float_info.max
for value in (5.0, 5.1, 5.9, -5.1, -5.9, 0.0, -0.0, float_max, -float_max):
with self.subTest(value=value):
self.assertEqual(fromdouble(value), int(value))
self.assertRaises(OverflowError, fromdouble, float('inf'))
self.assertRaises(OverflowError, fromdouble, float('-inf'))
self.assertRaises(ValueError, fromdouble, float('nan'))
def test_long_fromvoidptr(self):
# Test PyLong_FromVoidPtr()
fromvoidptr = _testlimitedcapi.pylong_fromvoidptr
obj = object()
x = fromvoidptr(obj)
y = fromvoidptr(NULL)
self.assertIsInstance(x, int)
self.assertGreaterEqual(x, 0)
self.assertIsInstance(y, int)
self.assertEqual(y, 0)
self.assertNotEqual(x, y)
def test_long_fromstring(self):
# Test PyLong_FromString()
fromstring = _testlimitedcapi.pylong_fromstring
self.assertEqual(fromstring(b'123', 10), (123, 3))
self.assertEqual(fromstring(b'cafe', 16), (0xcafe, 4))
self.assertEqual(fromstring(b'xyz', 36), (44027, 3))
self.assertEqual(fromstring(b'123', 0), (123, 3))
self.assertEqual(fromstring(b'0xcafe', 0), (0xcafe, 6))
self.assertRaises(ValueError, fromstring, b'cafe', 0)
self.assertEqual(fromstring(b'-123', 10), (-123, 4))
self.assertEqual(fromstring(b' -123 ', 10), (-123, 6))
self.assertEqual(fromstring(b'1_23', 10), (123, 4))
self.assertRaises(ValueError, fromstring, b'- 123', 10)
self.assertRaises(ValueError, fromstring, b'', 10)
self.assertRaises(ValueError, fromstring, b'123', 1)
self.assertRaises(ValueError, fromstring, b'123', -1)
self.assertRaises(ValueError, fromstring, b'123', 37)
self.assertRaises(ValueError, fromstring, '١٢٣٤٥٦٧٨٩٠'.encode(), 0)
self.assertRaises(ValueError, fromstring, '١٢٣٤٥٦٧٨٩٠'.encode(), 16)
self.assertEqual(fromstring(b'123\x00', 0), (123, 3))
self.assertEqual(fromstring(b'123\x00456', 0), (123, 3))
self.assertEqual(fromstring(b'123\x00', 16), (0x123, 3))
self.assertEqual(fromstring(b'123\x00456', 16), (0x123, 3))
# CRASHES fromstring(NULL, 0)
# CRASHES fromstring(NULL, 16)
def test_long_fromunicodeobject(self):
# Test PyLong_FromUnicodeObject()
fromunicodeobject = _testcapi.pylong_fromunicodeobject
self.assertEqual(fromunicodeobject('123', 10), 123)
self.assertEqual(fromunicodeobject('cafe', 16), 0xcafe)
self.assertEqual(fromunicodeobject('xyz', 36), 44027)
self.assertEqual(fromunicodeobject('123', 0), 123)
self.assertEqual(fromunicodeobject('0xcafe', 0), 0xcafe)
self.assertRaises(ValueError, fromunicodeobject, 'cafe', 0)
self.assertEqual(fromunicodeobject('-123', 10), -123)
self.assertEqual(fromunicodeobject(' -123 ', 10), -123)
self.assertEqual(fromunicodeobject('1_23', 10), 123)
self.assertRaises(ValueError, fromunicodeobject, '- 123', 10)
self.assertRaises(ValueError, fromunicodeobject, '', 10)
self.assertRaises(ValueError, fromunicodeobject, '123', 1)
self.assertRaises(ValueError, fromunicodeobject, '123', -1)
self.assertRaises(ValueError, fromunicodeobject, '123', 37)
self.assertEqual(fromunicodeobject('١٢٣٤٥٦٧٨٩٠', 0), 1234567890)
self.assertEqual(fromunicodeobject('١٢٣٤٥٦٧٨٩٠', 16), 0x1234567890)
self.assertRaises(ValueError, fromunicodeobject, '123\x00', 0)
self.assertRaises(ValueError, fromunicodeobject, '123\x00456', 0)
self.assertRaises(ValueError, fromunicodeobject, '123\x00', 16)
self.assertRaises(ValueError, fromunicodeobject, '123\x00456', 16)
# CRASHES fromunicodeobject(NULL, 0)
# CRASHES fromunicodeobject(NULL, 16)
def check_long_asint(self, func, min_val, max_val, *,
use_index=True,
mask=False,
negative_value_error=OverflowError):
# round trip (object -> C integer -> object)
values = (0, 1, 1234, max_val)
if min_val < 0:
values += (-1, min_val)
for value in values:
with self.subTest(value=value):
self.assertEqual(func(value), value)
self.assertEqual(func(IntSubclass(value)), value)
if use_index:
self.assertEqual(func(Index(value)), value)
if use_index:
self.assertEqual(func(MyIndexAndInt()), 10)
else:
self.assertRaises(TypeError, func, Index(42))
self.assertRaises(TypeError, func, MyIndexAndInt())
if mask:
self.assertEqual(func(min_val - 1), max_val)
self.assertEqual(func(max_val + 1), min_val)
self.assertEqual(func(-1 << 1000), 0)
self.assertEqual(func(1 << 1000), 0)
else:
self.assertRaises(negative_value_error, func, min_val - 1)
self.assertRaises(negative_value_error, func, -1 << 1000)
self.assertRaises(OverflowError, func, max_val + 1)
self.assertRaises(OverflowError, func, 1 << 1000)
self.assertRaises(TypeError, func, 1.0)
self.assertRaises(TypeError, func, b'2')
self.assertRaises(TypeError, func, '3')
self.assertRaises(SystemError, func, NULL)
def check_long_asintandoverflow(self, func, min_val, max_val):
# round trip (object -> C integer -> object)
for value in (min_val, max_val, -1, 0, 1, 1234):
with self.subTest(value=value):
self.assertEqual(func(value), (value, 0))
self.assertEqual(func(IntSubclass(value)), (value, 0))
self.assertEqual(func(Index(value)), (value, 0))
self.assertEqual(func(MyIndexAndInt()), (10, 0))
self.assertEqual(func(min_val - 1), (-1, -1))
self.assertEqual(func(max_val + 1), (-1, +1))
# CRASHES func(1.0)
# CRASHES func(NULL)
def test_long_asint(self):
# Test PyLong_AsInt()
PyLong_AsInt = _testlimitedcapi.PyLong_AsInt
from _testcapi import INT_MIN, INT_MAX
self.check_long_asint(PyLong_AsInt, INT_MIN, INT_MAX)
def test_long_aslong(self):
# Test PyLong_AsLong() and PyLong_FromLong()
aslong = _testlimitedcapi.pylong_aslong
from _testcapi import LONG_MIN, LONG_MAX
self.check_long_asint(aslong, LONG_MIN, LONG_MAX)
def test_long_aslongandoverflow(self):
# Test PyLong_AsLongAndOverflow()
aslongandoverflow = _testlimitedcapi.pylong_aslongandoverflow
from _testcapi import LONG_MIN, LONG_MAX
self.check_long_asintandoverflow(aslongandoverflow, LONG_MIN, LONG_MAX)
def test_long_asunsignedlong(self):
# Test PyLong_AsUnsignedLong() and PyLong_FromUnsignedLong()
asunsignedlong = _testlimitedcapi.pylong_asunsignedlong
from _testcapi import ULONG_MAX
self.check_long_asint(asunsignedlong, 0, ULONG_MAX,
use_index=False)
def test_long_asunsignedlongmask(self):
# Test PyLong_AsUnsignedLongMask()
asunsignedlongmask = _testlimitedcapi.pylong_asunsignedlongmask
from _testcapi import ULONG_MAX
self.check_long_asint(asunsignedlongmask, 0, ULONG_MAX, mask=True)
def test_long_aslonglong(self):
# Test PyLong_AsLongLong() and PyLong_FromLongLong()
aslonglong = _testlimitedcapi.pylong_aslonglong
from _testcapi import LLONG_MIN, LLONG_MAX
self.check_long_asint(aslonglong, LLONG_MIN, LLONG_MAX)
def test_long_aslonglongandoverflow(self):
# Test PyLong_AsLongLongAndOverflow()
aslonglongandoverflow = _testlimitedcapi.pylong_aslonglongandoverflow
from _testcapi import LLONG_MIN, LLONG_MAX
self.check_long_asintandoverflow(aslonglongandoverflow, LLONG_MIN, LLONG_MAX)
def test_long_asunsignedlonglong(self):
# Test PyLong_AsUnsignedLongLong() and PyLong_FromUnsignedLongLong()
asunsignedlonglong = _testlimitedcapi.pylong_asunsignedlonglong
from _testcapi import ULLONG_MAX
self.check_long_asint(asunsignedlonglong, 0, ULLONG_MAX, use_index=False)
def test_long_asunsignedlonglongmask(self):
# Test PyLong_AsUnsignedLongLongMask()
asunsignedlonglongmask = _testlimitedcapi.pylong_asunsignedlonglongmask
from _testcapi import ULLONG_MAX
self.check_long_asint(asunsignedlonglongmask, 0, ULLONG_MAX, mask=True)
def test_long_as_ssize_t(self):
# Test PyLong_AsSsize_t() and PyLong_FromSsize_t()
as_ssize_t = _testlimitedcapi.pylong_as_ssize_t
from _testcapi import PY_SSIZE_T_MIN, PY_SSIZE_T_MAX
self.check_long_asint(as_ssize_t, PY_SSIZE_T_MIN, PY_SSIZE_T_MAX,
use_index=False)
def test_long_as_size_t(self):
# Test PyLong_AsSize_t() and PyLong_FromSize_t()
as_size_t = _testlimitedcapi.pylong_as_size_t
from _testcapi import SIZE_MAX
self.check_long_asint(as_size_t, 0, SIZE_MAX, use_index=False)
def test_long_asdouble(self):
# Test PyLong_AsDouble()
asdouble = _testlimitedcapi.pylong_asdouble
MAX = int(sys.float_info.max)
for value in (-MAX, MAX, -1, 0, 1, 1234):
with self.subTest(value=value):
self.assertEqual(asdouble(value), float(value))
self.assertIsInstance(asdouble(value), float)
self.assertEqual(asdouble(IntSubclass(42)), 42.0)
self.assertRaises(TypeError, asdouble, Index(42))
self.assertRaises(TypeError, asdouble, MyIndexAndInt())
self.assertRaises(OverflowError, asdouble, 2 * MAX)
self.assertRaises(OverflowError, asdouble, -2 * MAX)
self.assertRaises(TypeError, asdouble, 1.0)
self.assertRaises(TypeError, asdouble, b'2')
self.assertRaises(TypeError, asdouble, '3')
self.assertRaises(SystemError, asdouble, NULL)
def test_long_asvoidptr(self):
# Test PyLong_AsVoidPtr()
fromvoidptr = _testlimitedcapi.pylong_fromvoidptr
asvoidptr = _testlimitedcapi.pylong_asvoidptr
obj = object()
x = fromvoidptr(obj)
y = fromvoidptr(NULL)
self.assertIs(asvoidptr(x), obj)
self.assertIs(asvoidptr(y), NULL)
self.assertIs(asvoidptr(IntSubclass(x)), obj)
# negative values
M = (1 << _testcapi.SIZEOF_VOID_P * 8)
if x >= M//2:
self.assertIs(asvoidptr(x - M), obj)
if y >= M//2:
self.assertIs(asvoidptr(y - M), NULL)
self.assertRaises(TypeError, asvoidptr, Index(x))
self.assertRaises(TypeError, asvoidptr, object())
self.assertRaises(OverflowError, asvoidptr, 2**1000)
self.assertRaises(OverflowError, asvoidptr, -2**1000)
# CRASHES asvoidptr(NULL)
def _test_long_aspid(self, aspid):
# Test PyLong_AsPid()
from _testcapi import SIZEOF_PID_T
bits = 8 * SIZEOF_PID_T
PID_T_MIN = -2**(bits-1)
PID_T_MAX = 2**(bits-1) - 1
self.check_long_asint(aspid, PID_T_MIN, PID_T_MAX)
def test_long_aspid(self):
self._test_long_aspid(_testcapi.pylong_aspid)
def test_long_aspid_limited(self):
self._test_long_aspid(_testlimitedcapi.pylong_aspid)
@support.bigmemtest(2**32, memuse=0.35)
def test_long_asnativebytes_huge(self, size):
asnativebytes = _testcapi.pylong_asnativebytes
v = 1 << size
buffer = bytearray(size * 2 // 15 + 10)
r = asnativebytes(v, buffer, 0, -1)
self.assertEqual(r, size // 8 + 1)
self.assertEqual(buffer.count(0), len(buffer))
r = asnativebytes(v, buffer, len(buffer), -1)
self.assertEqual(r, size // 8 + 1)
self.assertEqual(buffer.count(0), len(buffer) - 1)
def test_long_asnativebytes(self):
import math
from _testcapi import (
pylong_asnativebytes as asnativebytes,
SIZE_MAX,
)
# Abbreviate sizeof(Py_ssize_t) to SZ because we use it a lot
SZ = int(math.ceil(math.log(SIZE_MAX + 1) / math.log(2)) / 8)
MAX_SSIZE = 2 ** (SZ * 8 - 1) - 1
MAX_USIZE = 2 ** (SZ * 8) - 1
if support.verbose:
print(f"SIZEOF_SIZE={SZ}\n{MAX_SSIZE=:016X}\n{MAX_USIZE=:016X}")
# These tests check that the requested buffer size is correct.
# This matches our current implementation: We only specify that the
# return value is a size *sufficient* to hold the result when queried
# using n_bytes=0. If our implementation changes, feel free to update
# the expectations here -- or loosen them to be range checks.
# (i.e. 0 *could* be stored in 1 byte and 512 in 2)
for v, expect in [
(0, SZ),
(512, SZ),
(-512, SZ),
(MAX_SSIZE, SZ),
(MAX_USIZE, SZ + 1),
(-MAX_SSIZE, SZ),
(-MAX_USIZE, SZ + 1),
(2**255-1, 32),
(-(2**255-1), 32),
(2**255, 33),
(-(2**255), 33), # if you ask, we'll say 33, but 32 would do
(2**256-1, 33),
(-(2**256-1), 33),
(2**256, 33),
(-(2**256), 33),
]:
with self.subTest(f"sizeof-{v:X}"):
buffer = bytearray(b"\x5a")
self.assertEqual(expect, asnativebytes(v, buffer, 0, -1),
"PyLong_AsNativeBytes(v, <unknown>, 0, -1)")
self.assertEqual(buffer, b"\x5a",
"buffer overwritten when it should not have been")
# Also check via the __index__ path.
# We pass Py_ASNATIVEBYTES_NATIVE_ENDIAN | ALLOW_INDEX
self.assertEqual(expect, asnativebytes(Index(v), buffer, 0, 3 | 16),
"PyLong_AsNativeBytes(Index(v), <unknown>, 0, -1)")
self.assertEqual(buffer, b"\x5a",
"buffer overwritten when it should not have been")
# Test that we populate n=2 bytes but do not overwrite more.
buffer = bytearray(b"\x99"*3)
self.assertEqual(2, asnativebytes(4, buffer, 2, 0), # BE
"PyLong_AsNativeBytes(v, <3 byte buffer>, 2, 0) // BE")
self.assertEqual(buffer, b"\x00\x04\x99")
self.assertEqual(2, asnativebytes(4, buffer, 2, 1), # LE
"PyLong_AsNativeBytes(v, <3 byte buffer>, 2, 1) // LE")
self.assertEqual(buffer, b"\x04\x00\x99")
# We request as many bytes as `expect_be` contains, and always check
# the result (both big and little endian). We check the return value
# independently, since the buffer should always be filled correctly even
# if we need more bytes
for v, expect_be, expect_n in [
(0, b'\x00', 1),
(0, b'\x00' * 2, 2),
(0, b'\x00' * 8, min(8, SZ)),
(1, b'\x01', 1),
(1, b'\x00' * 10 + b'\x01', min(11, SZ)),
(42, b'\x2a', 1),
(42, b'\x00' * 10 + b'\x2a', min(11, SZ)),
(-1, b'\xff', 1),
(-1, b'\xff' * 10, min(11, SZ)),
(-42, b'\xd6', 1),
(-42, b'\xff' * 10 + b'\xd6', min(11, SZ)),
# Extracts 255 into a single byte, but requests 2
# (this is currently a special case, and "should" request SZ)
(255, b'\xff', 2),
(255, b'\x00\xff', 2),
(256, b'\x01\x00', 2),
(0x80, b'\x00' * 7 + b'\x80', min(8, SZ)),
# Extracts successfully (unsigned), but requests 9 bytes
(2**63, b'\x80' + b'\x00' * 7, 9),
(2**63, b'\x00\x80' + b'\x00' * 7, 9),
# Extracts into 8 bytes, but if you provide 9 we'll say 9
(-2**63, b'\x80' + b'\x00' * 7, 8),
(-2**63, b'\xff\x80' + b'\x00' * 7, 9),
(2**255-1, b'\x7f' + b'\xff' * 31, 32),
(-(2**255-1), b'\x80' + b'\x00' * 30 + b'\x01', 32),
# Request extra bytes, but result says we only needed 32
(-(2**255-1), b'\xff\x80' + b'\x00' * 30 + b'\x01', 32),
(-(2**255-1), b'\xff\xff\x80' + b'\x00' * 30 + b'\x01', 32),
# Extracting 256 bits of integer will request 33 bytes, but still
# copy as many bits as possible into the buffer. So we *can* copy
# into a 32-byte buffer, though negative number may be unrecoverable
(2**256-1, b'\xff' * 32, 33),
(2**256-1, b'\x00' + b'\xff' * 32, 33),
(-(2**256-1), b'\x00' * 31 + b'\x01', 33),
(-(2**256-1), b'\xff' + b'\x00' * 31 + b'\x01', 33),
(-(2**256-1), b'\xff\xff' + b'\x00' * 31 + b'\x01', 33),
# However, -2**255 precisely will extract into 32 bytes and return
# success. For bigger buffers, it will still succeed, but will
# return 33
(-(2**255), b'\x80' + b'\x00' * 31, 32),
(-(2**255), b'\xff\x80' + b'\x00' * 31, 33),
# The classic "Windows HRESULT as negative number" case
# HRESULT hr;
# PyLong_AsNativeBytes(<-2147467259>, &hr, sizeof(HRESULT), -1)
# assert(hr == E_FAIL)
(-2147467259, b'\x80\x00\x40\x05', 4),
]:
with self.subTest(f"{v:X}-{len(expect_be)}bytes"):
n = len(expect_be)
# Fill the buffer with dummy data to ensure all bytes
# are overwritten.
buffer = bytearray(b"\xa5"*n)
expect_le = expect_be[::-1]
self.assertEqual(expect_n, asnativebytes(v, buffer, n, 0),
f"PyLong_AsNativeBytes(v, buffer, {n}, <big>)")
self.assertEqual(expect_be, buffer[:n], "<big>")
self.assertEqual(expect_n, asnativebytes(v, buffer, n, 1),
f"PyLong_AsNativeBytes(v, buffer, {n}, <little>)")
self.assertEqual(expect_le, buffer[:n], "<little>")
# Test cases that do not request size for a sign bit when we pass the
# Py_ASNATIVEBYTES_UNSIGNED_BUFFER flag
for v, expect_be, expect_n in [
(255, b'\xff', 1),
# We pass a 2 byte buffer so it just uses the whole thing
(255, b'\x00\xff', 2),
(2**63, b'\x80' + b'\x00' * 7, 8),
# We pass a 9 byte buffer so it uses the whole thing
(2**63, b'\x00\x80' + b'\x00' * 7, 9),
(2**256-1, b'\xff' * 32, 32),
# We pass a 33 byte buffer so it uses the whole thing
(2**256-1, b'\x00' + b'\xff' * 32, 33),
]:
with self.subTest(f"{v:X}-{len(expect_be)}bytes-unsigned"):
n = len(expect_be)
buffer = bytearray(b"\xa5"*n)
self.assertEqual(expect_n, asnativebytes(v, buffer, n, 4),
f"PyLong_AsNativeBytes(v, buffer, {n}, <big|unsigned>)")
self.assertEqual(expect_n, asnativebytes(v, buffer, n, 5),
f"PyLong_AsNativeBytes(v, buffer, {n}, <little|unsigned>)")
# Ensure Py_ASNATIVEBYTES_REJECT_NEGATIVE raises on negative value
with self.assertRaises(ValueError):
asnativebytes(-1, buffer, 0, 8)
# Ensure omitting Py_ASNATIVEBYTES_ALLOW_INDEX raises on __index__ value
with self.assertRaises(TypeError):
asnativebytes(Index(1), buffer, 0, -1)
with self.assertRaises(TypeError):
asnativebytes(Index(1), buffer, 0, 3)
# Check a few error conditions. These are validated in code, but are
# unspecified in docs, so if we make changes to the implementation, it's
# fine to just update these tests rather than preserve the behaviour.
with self.assertRaises(TypeError):
asnativebytes('not a number', buffer, 0, -1)
def test_long_asnativebytes_fuzz(self):
import math
from random import Random
from _testcapi import (
pylong_asnativebytes as asnativebytes,
SIZE_MAX,
)
# Abbreviate sizeof(Py_ssize_t) to SZ because we use it a lot
SZ = int(math.ceil(math.log(SIZE_MAX + 1) / math.log(2)) / 8)
rng = Random()
# Allocate bigger buffer than actual values are going to be
buffer = bytearray(260)
for _ in range(1000):
n = rng.randrange(1, 256)
bytes_be = bytes([
# Ensure the most significant byte is nonzero
rng.randrange(1, 256),
*[rng.randrange(256) for _ in range(n - 1)]
])
bytes_le = bytes_be[::-1]
v = int.from_bytes(bytes_le, 'little')
expect_1 = expect_2 = (SZ, n)
if bytes_be[0] & 0x80:
# All values are positive, so if MSB is set, expect extra bit
# when we request the size or have a large enough buffer
expect_1 = (SZ, n + 1)
# When passing Py_ASNATIVEBYTES_UNSIGNED_BUFFER, we expect the
# return to be exactly the right size.
expect_2 = (n,)
try:
actual = asnativebytes(v, buffer, 0, -1)
self.assertIn(actual, expect_1)
actual = asnativebytes(v, buffer, len(buffer), 0)
self.assertIn(actual, expect_1)
self.assertEqual(bytes_be, buffer[-n:])
actual = asnativebytes(v, buffer, len(buffer), 1)
self.assertIn(actual, expect_1)
self.assertEqual(bytes_le, buffer[:n])
actual = asnativebytes(v, buffer, n, 4)
self.assertIn(actual, expect_2, bytes_be.hex())
actual = asnativebytes(v, buffer, n, 5)
self.assertIn(actual, expect_2, bytes_be.hex())
except AssertionError as ex:
value_hex = ''.join(reversed([
f'{b:02X}{"" if i % 8 else "_"}'
for i, b in enumerate(bytes_le, start=1)
])).strip('_')
if support.verbose:
print()
print(n, 'bytes')
print('hex =', value_hex)
print('int =', v)
raise
raise AssertionError(f"Value: 0x{value_hex}") from ex
def test_long_fromnativebytes(self):
import math
from _testcapi import (
pylong_fromnativebytes as fromnativebytes,
SIZE_MAX,
)
# Abbreviate sizeof(Py_ssize_t) to SZ because we use it a lot
SZ = int(math.ceil(math.log(SIZE_MAX + 1) / math.log(2)) / 8)
MAX_SSIZE = 2 ** (SZ * 8 - 1) - 1
MAX_USIZE = 2 ** (SZ * 8) - 1
for v_be, expect_s, expect_u in [
(b'\x00', 0, 0),
(b'\x01', 1, 1),
(b'\xff', -1, 255),
(b'\x00\xff', 255, 255),
(b'\xff\xff', -1, 65535),
]:
with self.subTest(f"{expect_s}-{expect_u:X}-{len(v_be)}bytes"):
n = len(v_be)
v_le = v_be[::-1]
self.assertEqual(expect_s, fromnativebytes(v_be, n, 0, 1),
f"PyLong_FromNativeBytes(buffer, {n}, <big>)")
self.assertEqual(expect_s, fromnativebytes(v_le, n, 1, 1),
f"PyLong_FromNativeBytes(buffer, {n}, <little>)")
self.assertEqual(expect_u, fromnativebytes(v_be, n, 0, 0),
f"PyLong_FromUnsignedNativeBytes(buffer, {n}, <big>)")
self.assertEqual(expect_u, fromnativebytes(v_le, n, 1, 0),
f"PyLong_FromUnsignedNativeBytes(buffer, {n}, <little>)")
# Check native endian when the result would be the same either
# way and we can test it.
if v_be == v_le:
self.assertEqual(expect_s, fromnativebytes(v_be, n, -1, 1),
f"PyLong_FromNativeBytes(buffer, {n}, <native>)")
self.assertEqual(expect_u, fromnativebytes(v_be, n, -1, 0),
f"PyLong_FromUnsignedNativeBytes(buffer, {n}, <native>)")
# Swap the unsigned request for tests and use the
# Py_ASNATIVEBYTES_UNSIGNED_BUFFER flag instead
self.assertEqual(expect_u, fromnativebytes(v_be, n, 4, 1),
f"PyLong_FromNativeBytes(buffer, {n}, <big|unsigned>)")
def test_long_getsign(self):
# Test PyLong_GetSign()
getsign = _testcapi.pylong_getsign
self.assertEqual(getsign(1), 1)
self.assertEqual(getsign(123456), 1)
self.assertEqual(getsign(-2), -1)
self.assertEqual(getsign(0), 0)
self.assertEqual(getsign(True), 1)
self.assertEqual(getsign(IntSubclass(-11)), -1)
self.assertEqual(getsign(False), 0)
self.assertRaises(TypeError, getsign, 1.0)
self.assertRaises(TypeError, getsign, Index(123))
# CRASHES getsign(NULL)
def test_long_asint32(self):
# Test PyLong_AsInt32() and PyLong_FromInt32()
to_int32 = _testlimitedcapi.pylong_asint32
from _testcapi import INT32_MIN, INT32_MAX
self.check_long_asint(to_int32, INT32_MIN, INT32_MAX)
def test_long_asint64(self):
# Test PyLong_AsInt64() and PyLong_FromInt64()
as_int64 = _testlimitedcapi.pylong_asint64
from _testcapi import INT64_MIN, INT64_MAX
self.check_long_asint(as_int64, INT64_MIN, INT64_MAX)
def test_long_asuint32(self):
# Test PyLong_AsUInt32() and PyLong_FromUInt32()
as_uint32 = _testlimitedcapi.pylong_asuint32
from _testcapi import UINT32_MAX
self.check_long_asint(as_uint32, 0, UINT32_MAX,
negative_value_error=ValueError)
def test_long_asuint64(self):
# Test PyLong_AsUInt64() and PyLong_FromUInt64()
as_uint64 = _testlimitedcapi.pylong_asuint64
from _testcapi import UINT64_MAX
self.check_long_asint(as_uint64, 0, UINT64_MAX,
negative_value_error=ValueError)
if __name__ == "__main__":
unittest.main()
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