Lib/test/test_zipfile.py

# We can test part of the module without zlib.
try:
    import zlib
except ImportError:
    zlib = None

import io
import os
import shutil
import struct
import zipfile
import unittest


from tempfile import TemporaryFile
from random import randint, random
from unittest import skipUnless

from test.support import TESTFN, run_unittest, findfile, unlink

TESTFN2 = TESTFN + "2"
TESTFNDIR = TESTFN + "d"
FIXEDTEST_SIZE = 1000

SMALL_TEST_DATA = [('_ziptest1', '1q2w3e4r5t'),
                   ('ziptest2dir/_ziptest2', 'qawsedrftg'),
                   ('/ziptest2dir/ziptest3dir/_ziptest3', 'azsxdcfvgb'),
                   ('ziptest2dir/ziptest3dir/ziptest4dir/_ziptest3', '6y7u8i9o0p')]


class TestsWithSourceFile(unittest.TestCase):
    def setUp(self):
        self.line_gen = (bytes("Zipfile test line %d. random float: %f" %
                               (i, random()), "ascii")
                         for i in range(FIXEDTEST_SIZE))
        self.data = b'\n'.join(self.line_gen) + b'\n'

        # Make a source file with some lines
        fp = open(TESTFN, "wb")
        fp.write(self.data)
        fp.close()

    def make_test_archive(self, f, compression):
        # Create the ZIP archive
        zipfp = zipfile.ZipFile(f, "w", compression)
        zipfp.write(TESTFN, "another.name")
        zipfp.write(TESTFN, TESTFN)
        zipfp.writestr("strfile", self.data)
        zipfp.close()

    def zip_test(self, f, compression):
        self.make_test_archive(f, compression)

        # Read the ZIP archive
        zipfp = zipfile.ZipFile(f, "r", compression)
        self.assertEqual(zipfp.read(TESTFN), self.data)
        self.assertEqual(zipfp.read("another.name"), self.data)
        self.assertEqual(zipfp.read("strfile"), self.data)

        # Print the ZIP directory
        fp = io.StringIO()
        zipfp.printdir(file=fp)
        directory = fp.getvalue()
        lines = directory.splitlines()
        self.assertEquals(len(lines), 4) # Number of files + header

        self.assertTrue('File Name' in lines[0])
        self.assertTrue('Modified' in lines[0])
        self.assertTrue('Size' in lines[0])

        fn, date, time, size = lines[1].split()
        self.assertEquals(fn, 'another.name')
        # XXX: timestamp is not tested
        self.assertEquals(size, str(len(self.data)))

        # Check the namelist
        names = zipfp.namelist()
        self.assertEquals(len(names), 3)
        self.assertTrue(TESTFN in names)
        self.assertTrue("another.name" in names)
        self.assertTrue("strfile" in names)

        # Check infolist
        infos = zipfp.infolist()
        names = [ i.filename for i in infos ]
        self.assertEquals(len(names), 3)
        self.assertTrue(TESTFN in names)
        self.assertTrue("another.name" in names)
        self.assertTrue("strfile" in names)
        for i in infos:
            self.assertEquals(i.file_size, len(self.data))

        # check getinfo
        for nm in (TESTFN, "another.name", "strfile"):
            info = zipfp.getinfo(nm)
            self.assertEquals(info.filename, nm)
            self.assertEquals(info.file_size, len(self.data))

        # Check that testzip doesn't raise an exception
        zipfp.testzip()
        zipfp.close()

    def test_stored(self):
        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
            self.zip_test(f, zipfile.ZIP_STORED)

    def zip_open_test(self, f, compression):
        self.make_test_archive(f, compression)

        # Read the ZIP archive
        zipfp = zipfile.ZipFile(f, "r", compression)
        zipdata1 = []
        zipopen1 = zipfp.open(TESTFN)
        while 1:
            read_data = zipopen1.read(256)
            if not read_data:
                break
            zipdata1.append(read_data)

        zipdata2 = []
        zipopen2 = zipfp.open("another.name")
        while 1:
            read_data = zipopen2.read(256)
            if not read_data:
                break
            zipdata2.append(read_data)

        self.assertEqual(b''.join(zipdata1), self.data)
        self.assertEqual(b''.join(zipdata2), self.data)
        zipfp.close()

    def test_open_stored(self):
        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
            self.zip_open_test(f, zipfile.ZIP_STORED)

    def test_open_via_zip_info(self):
        # Create the ZIP archive
        zipfp = zipfile.ZipFile(TESTFN2, "w", zipfile.ZIP_STORED)
        zipfp.writestr("name", "foo")
        zipfp.writestr("name", "bar")
        zipfp.close()

        zipfp = zipfile.ZipFile(TESTFN2, "r")
        infos = zipfp.infolist()
        data = b""
        for info in infos:
            data += zipfp.open(info).read()
        self.assertTrue(data == b"foobar" or data == b"barfoo")
        data = b""
        for info in infos:
            data += zipfp.read(info)
        self.assertTrue(data == b"foobar" or data == b"barfoo")
        zipfp.close()

    def zip_random_open_test(self, f, compression):
        self.make_test_archive(f, compression)

        # Read the ZIP archive
        zipfp = zipfile.ZipFile(f, "r", compression)
        zipdata1 = []
        zipopen1 = zipfp.open(TESTFN)
        while 1:
            read_data = zipopen1.read(randint(1, 1024))
            if not read_data:
                break
            zipdata1.append(read_data)

        self.assertEqual(b''.join(zipdata1), self.data)
        zipfp.close()

    def test_random_open_stored(self):
        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
            self.zip_random_open_test(f, zipfile.ZIP_STORED)

    def zip_readline_test(self, f, compression):
        self.make_test_archive(f, compression)

        # Read the ZIP archive
        zipfp = zipfile.ZipFile(f, "r")
        zipopen = zipfp.open(TESTFN)
        for line in self.line_gen:
            linedata = zipopen.readline()
            self.assertEqual(linedata, line + '\n')

        zipfp.close()

    def zip_readlines_test(self, f, compression):
        self.make_test_archive(f, compression)

        # Read the ZIP archive
        zipfp = zipfile.ZipFile(f, "r")
        ziplines = zipfp.open(TESTFN).readlines()
        for line, zipline in zip(self.line_gen, ziplines):
            self.assertEqual(zipline, line + '\n')

        zipfp.close()

    def zip_iterlines_test(self, f, compression):
        self.make_test_archive(f, compression)

        # Read the ZIP archive
        zipfp = zipfile.ZipFile(f, "r")
        for line, zipline in zip(self.line_gen, zipfp.open(TESTFN)):
            self.assertEqual(zipline, line + '\n')

        zipfp.close()

    def test_readline_stored(self):
        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
            self.zip_readline_test(f, zipfile.ZIP_STORED)

    def test_readlines_stored(self):
        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
            self.zip_readlines_test(f, zipfile.ZIP_STORED)

    def test_iterlines_stored(self):
        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
            self.zip_iterlines_test(f, zipfile.ZIP_STORED)

    @skipUnless(zlib, "requires zlib")
    def test_deflated(self):
        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
            self.zip_test(f, zipfile.ZIP_DEFLATED)


    @skipUnless(zlib, "requires zlib")
    def test_open_deflated(self):
        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
            self.zip_open_test(f, zipfile.ZIP_DEFLATED)

    @skipUnless(zlib, "requires zlib")
    def test_random_open_deflated(self):
        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
            self.zip_random_open_test(f, zipfile.ZIP_DEFLATED)

    @skipUnless(zlib, "requires zlib")
    def test_readline_deflated(self):
        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
            self.zip_readline_test(f, zipfile.ZIP_DEFLATED)

    @skipUnless(zlib, "requires zlib")
    def test_readlines_deflated(self):
        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
            self.zip_readlines_test(f, zipfile.ZIP_DEFLATED)

    @skipUnless(zlib, "requires zlib")
    def test_iterlines_deflated(self):
        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
            self.zip_iterlines_test(f, zipfile.ZIP_DEFLATED)

    @skipUnless(zlib, "requires zlib")
    def test_low_compression(self):
        # Checks for cases where compressed data is larger than original
        # Create the ZIP archive
        zipfp = zipfile.ZipFile(TESTFN2, "w", zipfile.ZIP_DEFLATED)
        zipfp.writestr("strfile", '12')
        zipfp.close()

        # Get an open object for strfile
        zipfp = zipfile.ZipFile(TESTFN2, "r", zipfile.ZIP_DEFLATED)
        openobj = zipfp.open("strfile")
        self.assertEqual(openobj.read(1), b'1')
        self.assertEqual(openobj.read(1), b'2')

    def test_absolute_arcnames(self):
        zipfp = zipfile.ZipFile(TESTFN2, "w", zipfile.ZIP_STORED)
        zipfp.write(TESTFN, "/absolute")
        zipfp.close()

        zipfp = zipfile.ZipFile(TESTFN2, "r", zipfile.ZIP_STORED)
        self.assertEqual(zipfp.namelist(), ["absolute"])
        zipfp.close()

    def test_append_to_zip_file(self):
        # Test appending to an existing zipfile
        zipfp = zipfile.ZipFile(TESTFN2, "w", zipfile.ZIP_STORED)
        zipfp.write(TESTFN, TESTFN)
        zipfp.close()
        zipfp = zipfile.ZipFile(TESTFN2, "a", zipfile.ZIP_STORED)
        zipfp.writestr("strfile", self.data)
        self.assertEqual(zipfp.namelist(), [TESTFN, "strfile"])
        zipfp.close()

    def test_append_to_non_zip_file(self):
        # Test appending to an existing file that is not a zipfile
        # NOTE: this test fails if len(d) < 22 because of the first
        # line "fpin.seek(-22, 2)" in _EndRecData
        d = b'I am not a ZipFile!'*10
        f = open(TESTFN2, 'wb')
        f.write(d)
        f.close()
        zipfp = zipfile.ZipFile(TESTFN2, "a", zipfile.ZIP_STORED)
        zipfp.write(TESTFN, TESTFN)
        zipfp.close()

        f = open(TESTFN2, 'rb')
        f.seek(len(d))
        zipfp = zipfile.ZipFile(f, "r")
        self.assertEqual(zipfp.namelist(), [TESTFN])
        zipfp.close()
        f.close()

    def test_write_default_name(self):
        # Check that calling ZipFile.write without arcname specified produces the expected result
        zipfp = zipfile.ZipFile(TESTFN2, "w")
        zipfp.write(TESTFN)
        self.assertEqual(zipfp.read(TESTFN), open(TESTFN, "rb").read())
        zipfp.close()

    @skipUnless(zlib, "requires zlib")
    def test_per_file_compression(self):
        # Check that files within a Zip archive can have different compression options
        zipfp = zipfile.ZipFile(TESTFN2, "w")
        zipfp.write(TESTFN, 'storeme', zipfile.ZIP_STORED)
        zipfp.write(TESTFN, 'deflateme', zipfile.ZIP_DEFLATED)
        sinfo = zipfp.getinfo('storeme')
        dinfo = zipfp.getinfo('deflateme')
        self.assertEqual(sinfo.compress_type, zipfile.ZIP_STORED)
        self.assertEqual(dinfo.compress_type, zipfile.ZIP_DEFLATED)
        zipfp.close()

    def test_write_to_readonly(self):
        # Check that trying to call write() on a readonly ZipFile object
        # raises a RuntimeError
        zipf = zipfile.ZipFile(TESTFN2, mode="w")
        zipf.writestr("somefile.txt", "bogus")
        zipf.close()
        zipf = zipfile.ZipFile(TESTFN2, mode="r")
        self.assertRaises(RuntimeError, zipf.write, TESTFN)
        zipf.close()

    def test_extract(self):
        zipfp = zipfile.ZipFile(TESTFN2, "w", zipfile.ZIP_STORED)
        for fpath, fdata in SMALL_TEST_DATA:
            zipfp.writestr(fpath, fdata)
        zipfp.close()

        zipfp = zipfile.ZipFile(TESTFN2, "r")
        for fpath, fdata in SMALL_TEST_DATA:
            writtenfile = zipfp.extract(fpath)

            # make sure it was written to the right place
            if os.path.isabs(fpath):
                correctfile = os.path.join(os.getcwd(), fpath[1:])
            else:
                correctfile = os.path.join(os.getcwd(), fpath)
            correctfile = os.path.normpath(correctfile)

            self.assertEqual(writtenfile, correctfile)

            # make sure correct data is in correct file
            self.assertEqual(fdata.encode(), open(writtenfile, "rb").read())

            os.remove(writtenfile)

        zipfp.close()

        # remove the test file subdirectories
        shutil.rmtree(os.path.join(os.getcwd(), 'ziptest2dir'))

    def test_extract_all(self):
        zipfp = zipfile.ZipFile(TESTFN2, "w", zipfile.ZIP_STORED)
        for fpath, fdata in SMALL_TEST_DATA:
            zipfp.writestr(fpath, fdata)
        zipfp.close()

        zipfp = zipfile.ZipFile(TESTFN2, "r")
        zipfp.extractall()
        for fpath, fdata in SMALL_TEST_DATA:
            if os.path.isabs(fpath):
                outfile = os.path.join(os.getcwd(), fpath[1:])
            else:
                outfile = os.path.join(os.getcwd(), fpath)

            self.assertEqual(fdata.encode(), open(outfile, "rb").read())

            os.remove(outfile)

        zipfp.close()

        # remove the test file subdirectories
        shutil.rmtree(os.path.join(os.getcwd(), 'ziptest2dir'))

    def zip_test_writestr_permissions(self, f, compression):
        # Make sure that writestr creates files with mode 0600,
        # when it is passed a name rather than a ZipInfo instance.

        self.make_test_archive(f, compression)
        zipfp = zipfile.ZipFile(f, "r")
        zinfo = zipfp.getinfo('strfile')
        self.assertEqual(zinfo.external_attr, 0o600 << 16)

    def test_writestr_permissions(self):
        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
            self.zip_test_writestr_permissions(f, zipfile.ZIP_STORED)

    def test_writestr_extended_local_header_issue1202(self):
        orig_zip = zipfile.ZipFile(TESTFN2, 'w')
        for data in 'abcdefghijklmnop':
            zinfo = zipfile.ZipInfo(data)
            zinfo.flag_bits |= 0x08  # Include an extended local header.
            orig_zip.writestr(zinfo, data)
        orig_zip.close()

    def tearDown(self):
        unlink(TESTFN)
        unlink(TESTFN2)


class TestZip64InSmallFiles(unittest.TestCase):
    # These tests test the ZIP64 functionality without using large files,
    # see test_zipfile64 for proper tests.

    def setUp(self):
        self._limit = zipfile.ZIP64_LIMIT
        zipfile.ZIP64_LIMIT = 5

        line_gen = (bytes("Test of zipfile line %d." % i, "ascii")
                    for i in range(0, FIXEDTEST_SIZE))
        self.data = b'\n'.join(line_gen)

        # Make a source file with some lines
        fp = open(TESTFN, "wb")
        fp.write(self.data)
        fp.close()

    def large_file_exception_test(self, f, compression):
        zipfp = zipfile.ZipFile(f, "w", compression)
        self.assertRaises(zipfile.LargeZipFile,
                zipfp.write, TESTFN, "another.name")
        zipfp.close()

    def large_file_exception_test2(self, f, compression):
        zipfp = zipfile.ZipFile(f, "w", compression)
        self.assertRaises(zipfile.LargeZipFile,
                zipfp.writestr, "another.name", self.data)
        zipfp.close()

    def test_large_file_exception(self):
        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
            self.large_file_exception_test(f, zipfile.ZIP_STORED)
            self.large_file_exception_test2(f, zipfile.ZIP_STORED)

    def zip_test(self, f, compression):
        # Create the ZIP archive
        zipfp = zipfile.ZipFile(f, "w", compression, allowZip64=True)
        zipfp.write(TESTFN, "another.name")
        zipfp.write(TESTFN, TESTFN)
        zipfp.writestr("strfile", self.data)
        zipfp.close()

        # Read the ZIP archive
        zipfp = zipfile.ZipFile(f, "r", compression)
        self.assertEqual(zipfp.read(TESTFN), self.data)
        self.assertEqual(zipfp.read("another.name"), self.data)
        self.assertEqual(zipfp.read("strfile"), self.data)

        # Print the ZIP directory
        fp = io.StringIO()
        zipfp.printdir(fp)

        directory = fp.getvalue()
        lines = directory.splitlines()
        self.assertEquals(len(lines), 4) # Number of files + header

        self.assertTrue('File Name' in lines[0])
        self.assertTrue('Modified' in lines[0])
        self.assertTrue('Size' in lines[0])

        fn, date, time, size = lines[1].split()
        self.assertEquals(fn, 'another.name')
        # XXX: timestamp is not tested
        self.assertEquals(size, str(len(self.data)))

        # Check the namelist
        names = zipfp.namelist()
        self.assertEquals(len(names), 3)
        self.assertTrue(TESTFN in names)
        self.assertTrue("another.name" in names)
        self.assertTrue("strfile" in names)

        # Check infolist
        infos = zipfp.infolist()
        names = [ i.filename for i in infos ]
        self.assertEquals(len(names), 3)
        self.assertTrue(TESTFN in names)
        self.assertTrue("another.name" in names)
        self.assertTrue("strfile" in names)
        for i in infos:
            self.assertEquals(i.file_size, len(self.data))

        # check getinfo
        for nm in (TESTFN, "another.name", "strfile"):
            info = zipfp.getinfo(nm)
            self.assertEquals(info.filename, nm)
            self.assertEquals(info.file_size, len(self.data))

        # Check that testzip doesn't raise an exception
        zipfp.testzip()

        zipfp.close()

    def test_stored(self):
        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
            self.zip_test(f, zipfile.ZIP_STORED)

    @skipUnless(zlib, "requires zlib")
    def test_deflated(self):
        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
            self.zip_test(f, zipfile.ZIP_DEFLATED)

    def test_absolute_arcnames(self):
        zipfp = zipfile.ZipFile(TESTFN2, "w", zipfile.ZIP_STORED, allowZip64=True)
        zipfp.write(TESTFN, "/absolute")
        zipfp.close()

        zipfp = zipfile.ZipFile(TESTFN2, "r", zipfile.ZIP_STORED)
        self.assertEqual(zipfp.namelist(), ["absolute"])
        zipfp.close()

    def tearDown(self):
        zipfile.ZIP64_LIMIT = self._limit
        unlink(TESTFN)
        unlink(TESTFN2)


class PyZipFileTests(unittest.TestCase):
    def test_write_pyfile(self):
        zipfp  = zipfile.PyZipFile(TemporaryFile(), "w")
        fn = __file__
        if fn.endswith('.pyc') or fn.endswith('.pyo'):
            fn = fn[:-1]

        zipfp.writepy(fn)

        bn = os.path.basename(fn)
        self.assertTrue(bn not in zipfp.namelist())
        self.assertTrue(bn + 'o' in zipfp.namelist() or bn + 'c' in zipfp.namelist())
        zipfp.close()

        zipfp  = zipfile.PyZipFile(TemporaryFile(), "w")
        fn = __file__
        if fn.endswith('.pyc') or fn.endswith('.pyo'):
            fn = fn[:-1]

        zipfp.writepy(fn, "testpackage")

        bn = "%s/%s"%("testpackage", os.path.basename(fn))
        self.assertTrue(bn not in zipfp.namelist())
        self.assertTrue(bn + 'o' in zipfp.namelist() or bn + 'c' in zipfp.namelist())
        zipfp.close()

    def test_write_python_package(self):
        import email
        packagedir = os.path.dirname(email.__file__)

        zipfp  = zipfile.PyZipFile(TemporaryFile(), "w")
        zipfp.writepy(packagedir)

        # Check for a couple of modules at different levels of the hieararchy
        names = zipfp.namelist()
        self.assertTrue('email/__init__.pyo' in names or 'email/__init__.pyc' in names)
        self.assertTrue('email/mime/text.pyo' in names or 'email/mime/text.pyc' in names)

    def test_write_python_directory(self):
        os.mkdir(TESTFN2)
        try:
            fp = open(os.path.join(TESTFN2, "mod1.py"), "w")
            fp.write("print(42)\n")
            fp.close()

            fp = open(os.path.join(TESTFN2, "mod2.py"), "w")
            fp.write("print(42 * 42)\n")
            fp.close()

            fp = open(os.path.join(TESTFN2, "mod2.txt"), "w")
            fp.write("bla bla bla\n")
            fp.close()

            zipfp  = zipfile.PyZipFile(TemporaryFile(), "w")
            zipfp.writepy(TESTFN2)

            names = zipfp.namelist()
            self.assertTrue('mod1.pyc' in names or 'mod1.pyo' in names)
            self.assertTrue('mod2.pyc' in names or 'mod2.pyo' in names)
            self.assertTrue('mod2.txt' not in names)

        finally:
            shutil.rmtree(TESTFN2)

    def test_write_non_pyfile(self):
        zipfp  = zipfile.PyZipFile(TemporaryFile(), "w")
        open(TESTFN, 'w').write('most definitely not a python file')
        self.assertRaises(RuntimeError, zipfp.writepy, TESTFN)
        os.remove(TESTFN)


class OtherTests(unittest.TestCase):
    def test_unicode_filenames(self):
        zf = zipfile.ZipFile(TESTFN, "w")
        zf.writestr("foo.txt", "Test for unicode filename")
        zf.writestr("\xf6.txt", "Test for unicode filename")
        zf.close()
        zf = zipfile.ZipFile(TESTFN, "r")
        self.assertEqual(zf.filelist[0].filename, "foo.txt")
        self.assertEqual(zf.filelist[1].filename, "\xf6.txt")
        zf.close()

    def test_create_non_existent_file_for_append(self):
        if os.path.exists(TESTFN):
            os.unlink(TESTFN)

        filename = 'testfile.txt'
        content = b'hello, world. this is some content.'

        try:
            zf = zipfile.ZipFile(TESTFN, 'a')
            zf.writestr(filename, content)
            zf.close()
        except IOError:
            self.fail('Could not append data to a non-existent zip file.')

        self.assertTrue(os.path.exists(TESTFN))

        zf = zipfile.ZipFile(TESTFN, 'r')
        self.assertEqual(zf.read(filename), content)
        zf.close()

    def test_close_erroneous_file(self):
        # This test checks that the ZipFile constructor closes the file object
        # it opens if there's an error in the file.  If it doesn't, the traceback
        # holds a reference to the ZipFile object and, indirectly, the file object.
        # On Windows, this causes the os.unlink() call to fail because the
        # underlying file is still open.  This is SF bug #412214.
        #
        fp = open(TESTFN, "w")
        fp.write("this is not a legal zip file\n")
        fp.close()
        try:
            zf = zipfile.ZipFile(TESTFN)
        except zipfile.BadZipfile:
            pass

    def test_is_zip_erroneous_file(self):
        # This test checks that the is_zipfile function correctly identifies
        # a file that is not a zip file

        # - passing a filename
        with open(TESTFN, "w") as fp:
            fp.write("this is not a legal zip file\n")
        chk = zipfile.is_zipfile(TESTFN)
        self.assertTrue(not chk)
        # - passing a file object
        with open(TESTFN, "rb") as fp:
            chk = zipfile.is_zipfile(fp)
            self.assertTrue(not chk)
        # - passing a file-like object
        fp = io.BytesIO()
        fp.write(b"this is not a legal zip file\n")
        chk = zipfile.is_zipfile(fp)
        self.assertTrue(not chk)
        fp.seek(0,0)
        chk = zipfile.is_zipfile(fp)
        self.assertTrue(not chk)

    def test_is_zip_valid_file(self):
        # This test checks that the is_zipfile function correctly identifies
        # a file that is a zip file

        # - passing a filename
        zipf = zipfile.ZipFile(TESTFN, mode="w")
        zipf.writestr("foo.txt", b"O, for a Muse of Fire!")
        zipf.close()
        chk = zipfile.is_zipfile(TESTFN)
        self.assertTrue(chk)
        # - passing a file object
        with open(TESTFN, "rb") as fp:
            chk = zipfile.is_zipfile(fp)
            self.assertTrue(chk)
            fp.seek(0,0)
            zip_contents = fp.read()
        # - passing a file-like object
        fp = io.BytesIO()
        fp.write(zip_contents)
        chk = zipfile.is_zipfile(fp)
        self.assertTrue(chk)
        fp.seek(0,0)
        chk = zipfile.is_zipfile(fp)
        self.assertTrue(chk)

    def test_non_existent_file_raises_IOError(self):
        # make sure we don't raise an AttributeError when a partially-constructed
        # ZipFile instance is finalized; this tests for regression on SF tracker
        # bug #403871.

        # The bug we're testing for caused an AttributeError to be raised
        # when a ZipFile instance was created for a file that did not
        # exist; the .fp member was not initialized but was needed by the
        # __del__() method.  Since the AttributeError is in the __del__(),
        # it is ignored, but the user should be sufficiently annoyed by
        # the message on the output that regression will be noticed
        # quickly.
        self.assertRaises(IOError, zipfile.ZipFile, TESTFN)

    def test_empty_file_raises_BadZipFile(self):
        f = open(TESTFN, 'w')
        f.close()
        self.assertRaises(zipfile.BadZipfile, zipfile.ZipFile, TESTFN)

        f = open(TESTFN, 'w')
        f.write("short file")
        f.close()
        self.assertRaises(zipfile.BadZipfile, zipfile.ZipFile, TESTFN)

    def test_closed_zip_raises_RuntimeError(self):
        # Verify that testzip() doesn't swallow inappropriate exceptions.
        data = io.BytesIO()
        zipf = zipfile.ZipFile(data, mode="w")
        zipf.writestr("foo.txt", "O, for a Muse of Fire!")
        zipf.close()

        # This is correct; calling .read on a closed ZipFile should throw
        # a RuntimeError, and so should calling .testzip.  An earlier
        # version of .testzip would swallow this exception (and any other)
        # and report that the first file in the archive was corrupt.
        self.assertRaises(RuntimeError, zipf.read, "foo.txt")
        self.assertRaises(RuntimeError, zipf.open, "foo.txt")
        self.assertRaises(RuntimeError, zipf.testzip)
        self.assertRaises(RuntimeError, zipf.writestr, "bogus.txt", "bogus")
        open(TESTFN, 'w').write('zipfile test data')
        self.assertRaises(RuntimeError, zipf.write, TESTFN)

    def test_bad_constructor_mode(self):
        # Check that bad modes passed to ZipFile constructor are caught
        self.assertRaises(RuntimeError, zipfile.ZipFile, TESTFN, "q")

    def test_bad_open_mode(self):
        # Check that bad modes passed to ZipFile.open are caught
        zipf = zipfile.ZipFile(TESTFN, mode="w")
        zipf.writestr("foo.txt", "O, for a Muse of Fire!")
        zipf.close()
        zipf = zipfile.ZipFile(TESTFN, mode="r")
        # read the data to make sure the file is there
        zipf.read("foo.txt")
        self.assertRaises(RuntimeError, zipf.open, "foo.txt", "q")
        zipf.close()

    def test_read0(self):
        # Check that calling read(0) on a ZipExtFile object returns an empty
        # string and doesn't advance file pointer
        zipf = zipfile.ZipFile(TESTFN, mode="w")
        zipf.writestr("foo.txt", "O, for a Muse of Fire!")
        # read the data to make sure the file is there
        f = zipf.open("foo.txt")
        for i in range(FIXEDTEST_SIZE):
            self.assertEqual(f.read(0), b'')

        self.assertEqual(f.read(), b"O, for a Muse of Fire!")
        zipf.close()

    def test_open_non_existent_item(self):
        # Check that attempting to call open() for an item that doesn't
        # exist in the archive raises a RuntimeError
        zipf = zipfile.ZipFile(TESTFN, mode="w")
        self.assertRaises(KeyError, zipf.open, "foo.txt", "r")

    def test_bad_compression_mode(self):
        # Check that bad compression methods passed to ZipFile.open are caught
        self.assertRaises(RuntimeError, zipfile.ZipFile, TESTFN, "w", -1)

    def test_null_byte_in_filename(self):
        # Check that a filename containing a null byte is properly terminated
        zipf = zipfile.ZipFile(TESTFN, mode="w")
        zipf.writestr("foo.txt\x00qqq", b"O, for a Muse of Fire!")
        self.assertEqual(zipf.namelist(), ['foo.txt'])

    def test_struct_sizes(self):
        # check that ZIP internal structure sizes are calculated correctly
        self.assertEqual(zipfile.sizeEndCentDir, 22)
        self.assertEqual(zipfile.sizeCentralDir, 46)
        self.assertEqual(zipfile.sizeEndCentDir64, 56)
        self.assertEqual(zipfile.sizeEndCentDir64Locator, 20)

    def test_comments(self):
        # This test checks that comments on the archive are handled properly

        # check default comment is empty
        zipf = zipfile.ZipFile(TESTFN, mode="w")
        self.assertEqual(zipf.comment, b'')
        zipf.writestr("foo.txt", "O, for a Muse of Fire!")
        zipf.close()
        zipfr = zipfile.ZipFile(TESTFN, mode="r")
        self.assertEqual(zipfr.comment, b'')
        zipfr.close()

        # check a simple short comment
        comment = b'Bravely taking to his feet, he beat a very brave retreat.'
        zipf = zipfile.ZipFile(TESTFN, mode="w")
        zipf.comment = comment
        zipf.writestr("foo.txt", "O, for a Muse of Fire!")
        zipf.close()
        zipfr = zipfile.ZipFile(TESTFN, mode="r")
        self.assertEqual(zipfr.comment, comment)
        zipfr.close()

        # check a comment of max length
        comment2 = ''.join(['%d' % (i**3 % 10) for i in range((1 << 16)-1)])
        comment2 = comment2.encode("ascii")
        zipf = zipfile.ZipFile(TESTFN, mode="w")
        zipf.comment = comment2
        zipf.writestr("foo.txt", "O, for a Muse of Fire!")
        zipf.close()
        zipfr = zipfile.ZipFile(TESTFN, mode="r")
        self.assertEqual(zipfr.comment, comment2)
        zipfr.close()

        # check a comment that is too long is truncated
        zipf = zipfile.ZipFile(TESTFN, mode="w")
        zipf.comment = comment2 + b'oops'
        zipf.writestr("foo.txt", "O, for a Muse of Fire!")
        zipf.close()
        zipfr = zipfile.ZipFile(TESTFN, mode="r")
        self.assertEqual(zipfr.comment, comment2)
        zipfr.close()

    def tearDown(self):
        unlink(TESTFN)
        unlink(TESTFN2)


class DecryptionTests(unittest.TestCase):
    # This test checks that ZIP decryption works. Since the library does not
    # support encryption at the moment, we use a pre-generated encrypted
    # ZIP file

    data = (
    b'PK\x03\x04\x14\x00\x01\x00\x00\x00n\x92i.#y\xef?&\x00\x00\x00\x1a\x00'
    b'\x00\x00\x08\x00\x00\x00test.txt\xfa\x10\xa0gly|\xfa-\xc5\xc0=\xf9y'
    b'\x18\xe0\xa8r\xb3Z}Lg\xbc\xae\xf9|\x9b\x19\xe4\x8b\xba\xbb)\x8c\xb0\xdbl'
    b'PK\x01\x02\x14\x00\x14\x00\x01\x00\x00\x00n\x92i.#y\xef?&\x00\x00\x00'
    b'\x1a\x00\x00\x00\x08\x00\x00\x00\x00\x00\x00\x00\x01\x00 \x00\xb6\x81'
    b'\x00\x00\x00\x00test.txtPK\x05\x06\x00\x00\x00\x00\x01\x00\x01\x006\x00'
    b'\x00\x00L\x00\x00\x00\x00\x00' )
    data2 = (
    b'PK\x03\x04\x14\x00\t\x00\x08\x00\xcf}38xu\xaa\xb2\x14\x00\x00\x00\x00\x02'
    b'\x00\x00\x04\x00\x15\x00zeroUT\t\x00\x03\xd6\x8b\x92G\xda\x8b\x92GUx\x04'
    b'\x00\xe8\x03\xe8\x03\xc7<M\xb5a\xceX\xa3Y&\x8b{oE\xd7\x9d\x8c\x98\x02\xc0'
    b'PK\x07\x08xu\xaa\xb2\x14\x00\x00\x00\x00\x02\x00\x00PK\x01\x02\x17\x03'
    b'\x14\x00\t\x00\x08\x00\xcf}38xu\xaa\xb2\x14\x00\x00\x00\x00\x02\x00\x00'
    b'\x04\x00\r\x00\x00\x00\x00\x00\x00\x00\x00\x00\xa4\x81\x00\x00\x00\x00ze'
    b'roUT\x05\x00\x03\xd6\x8b\x92GUx\x00\x00PK\x05\x06\x00\x00\x00\x00\x01'
    b'\x00\x01\x00?\x00\x00\x00[\x00\x00\x00\x00\x00' )

    plain = b'zipfile.py encryption test'
    plain2 = b'\x00'*512

    def setUp(self):
        fp = open(TESTFN, "wb")
        fp.write(self.data)
        fp.close()
        self.zip = zipfile.ZipFile(TESTFN, "r")
        fp = open(TESTFN2, "wb")
        fp.write(self.data2)
        fp.close()
        self.zip2 = zipfile.ZipFile(TESTFN2, "r")

    def tearDown(self):
        self.zip.close()
        os.unlink(TESTFN)
        self.zip2.close()
        os.unlink(TESTFN2)

    def test_no_password(self):
        # Reading the encrypted file without password
        # must generate a RunTime exception
        self.assertRaises(RuntimeError, self.zip.read, "test.txt")
        self.assertRaises(RuntimeError, self.zip2.read, "zero")

    def test_bad_password(self):
        self.zip.setpassword(b"perl")
        self.assertRaises(RuntimeError, self.zip.read, "test.txt")
        self.zip2.setpassword(b"perl")
        self.assertRaises(RuntimeError, self.zip2.read, "zero")

    @skipUnless(zlib, "requires zlib")
    def test_good_password(self):
        self.zip.setpassword(b"python")
        self.assertEquals(self.zip.read("test.txt"), self.plain)
        self.zip2.setpassword(b"12345")
        self.assertEquals(self.zip2.read("zero"), self.plain2)


class TestsWithRandomBinaryFiles(unittest.TestCase):
    def setUp(self):
        datacount = randint(16, 64)*1024 + randint(1, 1024)
        self.data = b''.join(struct.pack('<f', random()*randint(-1000, 1000))
                             for i in range(datacount))

        # Make a source file with some lines
        fp = open(TESTFN, "wb")
        fp.write(self.data)
        fp.close()

    def tearDown(self):
        unlink(TESTFN)
        unlink(TESTFN2)

    def make_test_archive(self, f, compression):
        # Create the ZIP archive
        zipfp = zipfile.ZipFile(f, "w", compression)
        zipfp.write(TESTFN, "another.name")
        zipfp.write(TESTFN, TESTFN)
        zipfp.close()

    def zip_test(self, f, compression):
        self.make_test_archive(f, compression)

        # Read the ZIP archive
        zipfp = zipfile.ZipFile(f, "r", compression)
        testdata = zipfp.read(TESTFN)
        self.assertEqual(len(testdata), len(self.data))
        self.assertEqual(testdata, self.data)
        self.assertEqual(zipfp.read("another.name"), self.data)
        zipfp.close()

    def test_stored(self):
        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
            self.zip_test(f, zipfile.ZIP_STORED)

    def zip_open_test(self, f, compression):
        self.make_test_archive(f, compression)

        # Read the ZIP archive
        zipfp = zipfile.ZipFile(f, "r", compression)
        zipdata1 = []
        zipopen1 = zipfp.open(TESTFN)
        while 1:
            read_data = zipopen1.read(256)
            if not read_data:
                break
            zipdata1.append(read_data)

        zipdata2 = []
        zipopen2 = zipfp.open("another.name")
        while 1:
            read_data = zipopen2.read(256)
            if not read_data:
                break
            zipdata2.append(read_data)

        testdata1 = b''.join(zipdata1)
        self.assertEqual(len(testdata1), len(self.data))
        self.assertEqual(testdata1, self.data)

        testdata2 = b''.join(zipdata2)
        self.assertEqual(len(testdata1), len(self.data))
        self.assertEqual(testdata1, self.data)
        zipfp.close()

    def test_open_stored(self):
        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
            self.zip_open_test(f, zipfile.ZIP_STORED)

    def zip_random_open_test(self, f, compression):
        self.make_test_archive(f, compression)

        # Read the ZIP archive
        zipfp = zipfile.ZipFile(f, "r", compression)
        zipdata1 = []
        zipopen1 = zipfp.open(TESTFN)
        while 1:
            read_data = zipopen1.read(randint(1, 1024))
            if not read_data:
                break
            zipdata1.append(read_data)

        testdata = b''.join(zipdata1)
        self.assertEqual(len(testdata), len(self.data))
        self.assertEqual(testdata, self.data)
        zipfp.close()

    def test_random_open_stored(self):
        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
            self.zip_random_open_test(f, zipfile.ZIP_STORED)


@skipUnless(zlib, "requires zlib")
class TestsWithMultipleOpens(unittest.TestCase):
    def setUp(self):
        # Create the ZIP archive
        zipfp = zipfile.ZipFile(TESTFN2, "w", zipfile.ZIP_DEFLATED)
        zipfp.writestr('ones', '1'*FIXEDTEST_SIZE)
        zipfp.writestr('twos', '2'*FIXEDTEST_SIZE)
        zipfp.close()

    def test_same_file(self):
        # Verify that (when the ZipFile is in control of creating file objects)
        # multiple open() calls can be made without interfering with each other.
        zipf = zipfile.ZipFile(TESTFN2, mode="r")
        zopen1 = zipf.open('ones')
        zopen2 = zipf.open('ones')
        data1 = zopen1.read(500)
        data2 = zopen2.read(500)
        data1 += zopen1.read(500)
        data2 += zopen2.read(500)
        self.assertEqual(data1, data2)
        zipf.close()

    def test_different_file(self):
        # Verify that (when the ZipFile is in control of creating file objects)
        # multiple open() calls can be made without interfering with each other.
        zipf = zipfile.ZipFile(TESTFN2, mode="r")
        zopen1 = zipf.open('ones')
        zopen2 = zipf.open('twos')
        data1 = zopen1.read(500)
        data2 = zopen2.read(500)
        data1 += zopen1.read(500)
        data2 += zopen2.read(500)
        self.assertEqual(data1, b'1'*FIXEDTEST_SIZE)
        self.assertEqual(data2, b'2'*FIXEDTEST_SIZE)
        zipf.close()

    def test_interleaved(self):
        # Verify that (when the ZipFile is in control of creating file objects)
        # multiple open() calls can be made without interfering with each other.
        zipf = zipfile.ZipFile(TESTFN2, mode="r")
        zopen1 = zipf.open('ones')
        data1 = zopen1.read(500)
        zopen2 = zipf.open('twos')
        data2 = zopen2.read(500)
        data1 += zopen1.read(500)
        data2 += zopen2.read(500)
        self.assertEqual(data1, b'1'*FIXEDTEST_SIZE)
        self.assertEqual(data2, b'2'*FIXEDTEST_SIZE)
        zipf.close()

    def tearDown(self):
        unlink(TESTFN2)


class TestWithDirectory(unittest.TestCase):
    def setUp(self):
        os.mkdir(TESTFN2)

    def test_extract_dir(self):
        zipf = zipfile.ZipFile(findfile("zipdir.zip"))
        zipf.extractall(TESTFN2)
        self.assertTrue(os.path.isdir(os.path.join(TESTFN2, "a")))
        self.assertTrue(os.path.isdir(os.path.join(TESTFN2, "a", "b")))
        self.assertTrue(os.path.exists(os.path.join(TESTFN2, "a", "b", "c")))

    def test_bug_6050(self):
        # Extraction should succeed if directories already exist
        os.mkdir(os.path.join(TESTFN2, "a"))
        self.test_extract_dir()

    def test_store_dir(self):
        os.mkdir(os.path.join(TESTFN2, "x"))
        zipf = zipfile.ZipFile(TESTFN, "w")
        zipf.write(os.path.join(TESTFN2, "x"), "x")
        self.assertTrue(zipf.filelist[0].filename.endswith("x/"))

    def tearDown(self):
        shutil.rmtree(TESTFN2)
        if os.path.exists(TESTFN):
            unlink(TESTFN)


class UniversalNewlineTests(unittest.TestCase):
    def setUp(self):
        self.line_gen = [bytes("Test of zipfile line %d." % i, "ascii")
                         for i in range(FIXEDTEST_SIZE)]
        self.seps = ('\r', '\r\n', '\n')
        self.arcdata, self.arcfiles = {}, {}
        for n, s in enumerate(self.seps):
            b = s.encode("ascii")
            self.arcdata[s] = b.join(self.line_gen) + b
            self.arcfiles[s] = '%s-%d' % (TESTFN, n)
            f = open(self.arcfiles[s], "wb")
            try:
                f.write(self.arcdata[s])
            finally:
                f.close()

    def make_test_archive(self, f, compression):
        # Create the ZIP archive
        zipfp = zipfile.ZipFile(f, "w", compression)
        for fn in self.arcfiles.values():
            zipfp.write(fn, fn)
        zipfp.close()

    def read_test(self, f, compression):
        self.make_test_archive(f, compression)

        # Read the ZIP archive
        zipfp = zipfile.ZipFile(f, "r")
        for sep, fn in self.arcfiles.items():
            zipdata = zipfp.open(fn, "rU").read()
            self.assertEqual(self.arcdata[sep], zipdata)

        zipfp.close()

    def readline_test(self, f, compression):
        self.make_test_archive(f, compression)

        # Read the ZIP archive
        zipfp = zipfile.ZipFile(f, "r")
        for sep, fn in self.arcfiles.items():
            zipopen = zipfp.open(fn, "rU")
            for line in self.line_gen:
                linedata = zipopen.readline()
                self.assertEqual(linedata, line + b'\n')

        zipfp.close()

    def readlines_test(self, f, compression):
        self.make_test_archive(f, compression)

        # Read the ZIP archive
        zipfp = zipfile.ZipFile(f, "r")
        for sep, fn in self.arcfiles.items():
            ziplines = zipfp.open(fn, "rU").readlines()
            for line, zipline in zip(self.line_gen, ziplines):
                self.assertEqual(zipline, line + b'\n')

        zipfp.close()

    def iterlines_test(self, f, compression):
        self.make_test_archive(f, compression)

        # Read the ZIP archive
        zipfp = zipfile.ZipFile(f, "r")
        for sep, fn in self.arcfiles.items():
            for line, zipline in zip(self.line_gen, zipfp.open(fn, "rU")):
                self.assertEqual(zipline, line + b'\n')

        zipfp.close()

    def test_read_stored(self):
        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
            self.read_test(f, zipfile.ZIP_STORED)

    def test_readline_stored(self):
        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
            self.readline_test(f, zipfile.ZIP_STORED)

    def test_readlines_stored(self):
        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
            self.readlines_test(f, zipfile.ZIP_STORED)

    def test_iterlines_stored(self):
        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
            self.iterlines_test(f, zipfile.ZIP_STORED)

    @skipUnless(zlib, "requires zlib")
    def test_read_deflated(self):
        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
            self.read_test(f, zipfile.ZIP_DEFLATED)

    @skipUnless(zlib, "requires zlib")
    def test_readline_deflated(self):
        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
            self.readline_test(f, zipfile.ZIP_DEFLATED)

    @skipUnless(zlib, "requires zlib")
    def test_readlines_deflated(self):
        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
            self.readlines_test(f, zipfile.ZIP_DEFLATED)

    @skipUnless(zlib, "requires zlib")
    def test_iterlines_deflated(self):
        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
            self.iterlines_test(f, zipfile.ZIP_DEFLATED)

    def tearDown(self):
        for sep, fn in self.arcfiles.items():
            os.remove(fn)
        unlink(TESTFN)
        unlink(TESTFN2)


def test_main():
    run_unittest(TestsWithSourceFile, TestZip64InSmallFiles, OtherTests,
                 PyZipFileTests, DecryptionTests, TestsWithMultipleOpens,
                 TestWithDirectory, UniversalNewlineTests,
                 TestsWithRandomBinaryFiles)

if __name__ == "__main__":
    test_main()