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Name	Size	Permission	Date
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test_glob.py	18.21 KB	-rw-r--r--	2026-04-20 11:09
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testtar.tar	425 KB	-rw-r--r--	2026-03-03 16:09
testtar.tar.xz	172 B	-rw-r--r--	2026-03-03 16:09
tf_inherit_check.py	714 B	-rw-r--r--	2026-04-20 11:09
time_hashlib.py	2.87 KB	-rw-r--r--	2026-04-20 11:09
win_console_handler.py	1.38 KB	-rw-r--r--	2026-04-20 11:09
xmltests.py	499 B	-rw-r--r--	2026-04-20 11:09
zip_cp437_header.zip	270 B	-rw-r--r--	2026-03-03 16:09
zipdir.zip	374 B	-rw-r--r--	2026-03-03 16:09
zipdir_backslash.zip	192 B	-rw-r--r--	2026-03-03 16:09

Rename

"""Test largefile support on system where this makes sense.
"""

import os
import stat
import sys
import unittest
import socket
import shutil
import threading
from test.support import requires, bigmemtest, requires_resource
from test.support import SHORT_TIMEOUT
from test.support import socket_helper
from test.support.os_helper import TESTFN, unlink
import io  # C implementation of io
import _pyio as pyio # Python implementation of io

# size of file to create (>2 GiB; 2 GiB == 2,147,483,648 bytes)
size = 2_500_000_000
TESTFN2 = TESTFN + '2'

class LargeFileTest:

def setUp(self):
        if os.path.exists(TESTFN):
            mode = 'r+b'
        else:
            mode = 'w+b'

with self.open(TESTFN, mode) as f:
            current_size = os.fstat(f.fileno())[stat.ST_SIZE]
            if current_size == size+1:
                return

if current_size == 0:
                f.write(b'z')

f.seek(0)
            f.seek(size)
            f.write(b'a')
            f.flush()
            self.assertEqual(os.fstat(f.fileno())[stat.ST_SIZE], size+1)

@classmethod
    def tearDownClass(cls):
        with cls.open(TESTFN, 'wb'):
            pass
        if not os.stat(TESTFN)[stat.ST_SIZE] == 0:
            raise cls.failureException('File was not truncated by opening '
                                       'with mode "wb"')
        unlink(TESTFN2)

class TestFileMethods(LargeFileTest):
    """Test that each file function works as expected for large
    (i.e. > 2 GiB) files.
    """

# _pyio.FileIO.readall() uses a temporary bytearray then casted to bytes,
    # so memuse=2 is needed
    @bigmemtest(size=size, memuse=2, dry_run=False)
    def test_large_read(self, _size):
        # bpo-24658: Test that a read greater than 2GB does not fail.
        with self.open(TESTFN, "rb") as f:
            self.assertEqual(len(f.read()), size + 1)
            self.assertEqual(f.tell(), size + 1)

def test_osstat(self):
        self.assertEqual(os.stat(TESTFN)[stat.ST_SIZE], size+1)

def test_seek_read(self):
        with self.open(TESTFN, 'rb') as f:
            self.assertEqual(f.tell(), 0)
            self.assertEqual(f.read(1), b'z')
            self.assertEqual(f.tell(), 1)
            f.seek(0)
            self.assertEqual(f.tell(), 0)
            f.seek(0, 0)
            self.assertEqual(f.tell(), 0)
            f.seek(42)
            self.assertEqual(f.tell(), 42)
            f.seek(42, 0)
            self.assertEqual(f.tell(), 42)
            f.seek(42, 1)
            self.assertEqual(f.tell(), 84)
            f.seek(0, 1)
            self.assertEqual(f.tell(), 84)
            f.seek(0, 2)  # seek from the end
            self.assertEqual(f.tell(), size + 1 + 0)
            f.seek(-10, 2)
            self.assertEqual(f.tell(), size + 1 - 10)
            f.seek(-size-1, 2)
            self.assertEqual(f.tell(), 0)
            f.seek(size)
            self.assertEqual(f.tell(), size)
            # the 'a' that was written at the end of file above
            self.assertEqual(f.read(1), b'a')
            f.seek(-size-1, 1)
            self.assertEqual(f.read(1), b'z')
            self.assertEqual(f.tell(), 1)

def test_lseek(self):
        with self.open(TESTFN, 'rb') as f:
            self.assertEqual(os.lseek(f.fileno(), 0, 0), 0)
            self.assertEqual(os.lseek(f.fileno(), 42, 0), 42)
            self.assertEqual(os.lseek(f.fileno(), 42, 1), 84)
            self.assertEqual(os.lseek(f.fileno(), 0, 1), 84)
            self.assertEqual(os.lseek(f.fileno(), 0, 2), size+1+0)
            self.assertEqual(os.lseek(f.fileno(), -10, 2), size+1-10)
            self.assertEqual(os.lseek(f.fileno(), -size-1, 2), 0)
            self.assertEqual(os.lseek(f.fileno(), size, 0), size)
            # the 'a' that was written at the end of file above
            self.assertEqual(f.read(1), b'a')

def test_truncate(self):
        with self.open(TESTFN, 'r+b') as f:
            if not hasattr(f, 'truncate'):
                raise unittest.SkipTest("open().truncate() not available "
                                        "on this system")
            f.seek(0, 2)
            # else we've lost track of the true size
            self.assertEqual(f.tell(), size+1)
            # Cut it back via seek + truncate with no argument.
            newsize = size - 10
            f.seek(newsize)
            f.truncate()
            self.assertEqual(f.tell(), newsize)  # else pointer moved
            f.seek(0, 2)
            self.assertEqual(f.tell(), newsize)  # else wasn't truncated
            # Ensure that truncate(smaller than true size) shrinks
            # the file.
            newsize -= 1
            f.seek(42)
            f.truncate(newsize)
            self.assertEqual(f.tell(), 42)
            f.seek(0, 2)
            self.assertEqual(f.tell(), newsize)
            # XXX truncate(larger than true size) is ill-defined
            # across platform; cut it waaaaay back
            f.seek(0)
            f.truncate(1)
            self.assertEqual(f.tell(), 0)       # else pointer moved
            f.seek(0)
            # Verify readall on a truncated file is well behaved. read()
            # without a size can be unbounded, this should get just the byte
            # that remains.
            self.assertEqual(len(f.read()), 1)  # else wasn't truncated

def test_seekable(self):
        # Issue #5016; seekable() can return False when the current position
        # is negative when truncated to an int.
        for pos in (2**31-1, 2**31, 2**31+1):
            with self.open(TESTFN, 'rb') as f:
                f.seek(pos)
                self.assertTrue(f.seekable())

@bigmemtest(size=size, memuse=2, dry_run=False)
    def test_seek_readall(self, _size):
        # Seek which doesn't change position should readall successfully.
        with self.open(TESTFN, 'rb') as f:
            self.assertEqual(f.seek(0, os.SEEK_CUR), 0)
            self.assertEqual(len(f.read()), size + 1)

# Seek which changes (or might change) position should readall
        # successfully.
        with self.open(TESTFN, 'rb') as f:
            self.assertEqual(f.seek(20, os.SEEK_SET), 20)
            self.assertEqual(len(f.read()), size - 19)

with self.open(TESTFN, 'rb') as f:
            self.assertEqual(f.seek(-3, os.SEEK_END), size - 2)
            self.assertEqual(len(f.read()), 3)

def skip_no_disk_space(path, required):
    def decorator(fun):
        def wrapper(*args, **kwargs):
            if not hasattr(shutil, "disk_usage"):
                raise unittest.SkipTest("requires shutil.disk_usage")
            if shutil.disk_usage(os.path.realpath(path)).free < required:
                hsize = int(required / 1024 / 1024)
                raise unittest.SkipTest(
                    f"required {hsize} MiB of free disk space")
            return fun(*args, **kwargs)
        return wrapper
    return decorator

class TestCopyfile(LargeFileTest, unittest.TestCase):
    open = staticmethod(io.open)

# Exact required disk space would be (size * 2), but let's give it a
    # bit more tolerance.
    @skip_no_disk_space(TESTFN, size * 2.5)
    @requires_resource('cpu')
    def test_it(self):
        # Internally shutil.copyfile() can use "fast copy" methods like
        # os.sendfile().
        size = os.path.getsize(TESTFN)
        shutil.copyfile(TESTFN, TESTFN2)
        self.assertEqual(os.path.getsize(TESTFN2), size)
        with open(TESTFN2, 'rb') as f:
            self.assertEqual(f.read(5), b'z\x00\x00\x00\x00')
            f.seek(size - 5)
            self.assertEqual(f.read(), b'\x00\x00\x00\x00a')

@unittest.skipIf(not hasattr(os, 'sendfile'), 'sendfile not supported')
class TestSocketSendfile(LargeFileTest, unittest.TestCase):
    open = staticmethod(io.open)
    timeout = SHORT_TIMEOUT

def setUp(self):
        super().setUp()
        self.thread = None

def tearDown(self):
        super().tearDown()
        if self.thread is not None:
            self.thread.join(self.timeout)
            self.thread = None

def tcp_server(self, sock):
        def run(sock):
            with sock:
                conn, _ = sock.accept()
                conn.settimeout(self.timeout)
                with conn, open(TESTFN2, 'wb') as f:
                    event.wait(self.timeout)
                    while True:
                        chunk = conn.recv(65536)
                        if not chunk:
                            return
                        f.write(chunk)

event = threading.Event()
        sock.settimeout(self.timeout)
        self.thread = threading.Thread(target=run, args=(sock, ))
        self.thread.start()
        event.set()

# Exact required disk space would be (size * 2), but let's give it a
    # bit more tolerance.
    @skip_no_disk_space(TESTFN, size * 2.5)
    @requires_resource('cpu')
    def test_it(self):
        port = socket_helper.find_unused_port()
        with socket.create_server(("", port)) as sock:
            self.tcp_server(sock)
            with socket.create_connection(("127.0.0.1", port)) as client:
                with open(TESTFN, 'rb') as f:
                    client.sendfile(f)
        self.tearDown()

size = os.path.getsize(TESTFN)
        self.assertEqual(os.path.getsize(TESTFN2), size)
        with open(TESTFN2, 'rb') as f:
            self.assertEqual(f.read(5), b'z\x00\x00\x00\x00')
            f.seek(size - 5)
            self.assertEqual(f.read(), b'\x00\x00\x00\x00a')

def setUpModule():
    try:
        import signal
        # The default handler for SIGXFSZ is to abort the process.
        # By ignoring it, system calls exceeding the file size resource
        # limit will raise OSError instead of crashing the interpreter.
        signal.signal(signal.SIGXFSZ, signal.SIG_IGN)
    except (ImportError, AttributeError):
        pass

# On Windows and Mac OSX this test consumes large resources; It
    # takes a long time to build the >2 GiB file and takes >2 GiB of disk
    # space therefore the resource must be enabled to run this test.
    # If not, nothing after this line stanza will be executed.
    if sys.platform[:3] == 'win' or sys.platform == 'darwin':
        requires('largefile',
                 'test requires %s bytes and a long time to run' % str(size))
    else:
        # Only run if the current filesystem supports large files.
        # (Skip this test on Windows, since we now always support
        # large files.)
        f = open(TESTFN, 'wb', buffering=0)
        try:
            # 2**31 == 2147483648
            f.seek(2147483649)
            # Seeking is not enough of a test: you must write and flush, too!
            f.write(b'x')
            f.flush()
        except (OSError, OverflowError):
            raise unittest.SkipTest("filesystem does not have "
                                    "largefile support")
        finally:
            f.close()
            unlink(TESTFN)

class CLargeFileTest(TestFileMethods, unittest.TestCase):
    open = staticmethod(io.open)

class PyLargeFileTest(TestFileMethods, unittest.TestCase):
    open = staticmethod(pyio.open)

def tearDownModule():
    unlink(TESTFN)
    unlink(TESTFN2)

if __name__ == '__main__':
    unittest.main()