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Issue #11277: test_zlib tests a buffer of 1 GB on 32 bits

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(instead of a buffer of 2 GB)
This commit is contained in:
Victor Stinner 2011-05-04 21:27:39 +02:00
parent 6fa0947285
commit 7fd90c403d
1 changed files with 15 additions and 6 deletions
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21
Lib/test/test_zlib.py
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@ -2,7 +2,7 @@ import unittest
from test.test_support import TESTFN, run_unittest, import_module, unlink, requires from test.test_support import TESTFN, run_unittest, import_module, unlink, requires
import binascii import binascii
import random import random
from test.test_support import precisionbigmemtest, _1G from test.test_support import precisionbigmemtest, _1G, _4G
import sys import sys
try: try:
@ -72,20 +72,29 @@ class ChecksumTestCase(unittest.TestCase):
zlib.crc32('spam', (2**31))) zlib.crc32('spam', (2**31)))
# Issue #11277 - check that inputs of 2 GB are handled correctly. # Issue #11277 - check that inputs of 2 GB (or 1 GB on 32 bits system) are
# Be aware of issues #1202, #8650, #8651 and #10276 # handled correctly. Be aware of issues #1202. We cannot test a buffer of 4 GB
# or more (#8650, #8651 and #10276), because the zlib stores the buffer size
# into an int.
class ChecksumBigBufferTestCase(unittest.TestCase): class ChecksumBigBufferTestCase(unittest.TestCase):
int_max = 0x7FFFFFFF if sys.maxsize > _4G:
# (64 bits system) crc32() and adler32() stores the buffer size into an
# int, the maximum filesize is INT_MAX (0x7FFFFFFF)
filesize = 0x7FFFFFFF
else:
# (32 bits system) On a 32 bits OS, a process cannot usually address
# more than 2 GB, so test only 1 GB
filesize = _1G
@unittest.skipUnless(mmap, "mmap() is not available.") @unittest.skipUnless(mmap, "mmap() is not available.")
def test_big_buffer(self): def test_big_buffer(self):
if sys.platform[:3] == 'win' or sys.platform == 'darwin': if sys.platform[:3] == 'win' or sys.platform == 'darwin':
requires('largefile', requires('largefile',
'test requires %s bytes and a long time to run' % 'test requires %s bytes and a long time to run' %
str(self.int_max)) str(self.filesize))
try: try:
with open(TESTFN, "wb+") as f: with open(TESTFN, "wb+") as f:
f.seek(self.int_max-4) f.seek(self.filesize-4)
f.write("asdf") f.write("asdf")
f.flush() f.flush()
m = mmap.mmap(f.fileno(), 0, access=mmap.ACCESS_READ) m = mmap.mmap(f.fileno(), 0, access=mmap.ACCESS_READ)