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
        with zipfile.ZipFile(f, "w", compression) as zipfp:
            zipfp.write(TESTFN, "another.name")
            zipfp.write(TESTFN, TESTFN)
            zipfp.writestr("strfile", self.data)

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

        # Read the ZIP archive
        with zipfile.ZipFile(f, "r", compression) as zipfp:
            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()

    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
        with zipfile.ZipFile(f, "r", compression) as zipfp:
            zipdata1 = []
            zipopen1 = zipfp.open(TESTFN)
            while True:
                read_data = zipopen1.read(256)
                if not read_data:
                    break
                zipdata1.append(read_data)

            zipdata2 = []
            zipopen2 = zipfp.open("another.name")
            while True:
                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)

    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
        with zipfile.ZipFile(TESTFN2, "w", zipfile.ZIP_STORED) as zipfp:
            zipfp.writestr("name", "foo")
            zipfp.writestr("name", "bar")

        with zipfile.ZipFile(TESTFN2, "r") as zipfp:
            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")

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

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

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


    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
        with zipfile.ZipFile(f, "r") as zipfp:
            zipopen = zipfp.open(TESTFN)
            for line in self.line_gen:
                linedata = zipopen.readline()
                self.assertEqual(linedata, line + '\n')

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

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

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

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

    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
        with zipfile.ZipFile(TESTFN2, "w", zipfile.ZIP_DEFLATED) as zipfp:
            zipfp.writestr("strfile", '12')

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

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

        with zipfile.ZipFile(TESTFN2, "r", zipfile.ZIP_STORED) as zipfp:
            self.assertEqual(zipfp.namelist(), ["absolute"])

    def test_append_to_zip_file(self):
        # Test appending to an existing zipfile
        with zipfile.ZipFile(TESTFN2, "w", zipfile.ZIP_STORED) as zipfp:
            zipfp.write(TESTFN, TESTFN)

        with zipfile.ZipFile(TESTFN2, "a", zipfile.ZIP_STORED) as zipfp:
            zipfp.writestr("strfile", self.data)
            self.assertEqual(zipfp.namelist(), [TESTFN, "strfile"])

    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()
        with zipfile.ZipFile(TESTFN2, "a", zipfile.ZIP_STORED) as zipfp:
            zipfp.write(TESTFN, TESTFN)

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

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

    @skipUnless(zlib, "requires zlib")
    def test_per_file_compression(self):
        # Check that files within a Zip archive can have different compression options
        with zipfile.ZipFile(TESTFN2, "w") as zipfp:
            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)

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

        with zipfile.ZipFile(TESTFN2, mode="r") as zipfp:
            self.assertRaises(RuntimeError, zipfp.write, TESTFN)

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

        with zipfile.ZipFile(TESTFN2, "r") as zipfp:
            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)

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

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

        with zipfile.ZipFile(TESTFN2, "r") as zipfp:
            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)

        # 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)
        with zipfile.ZipFile(f, "r") as zipfp:
            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):
        with zipfile.ZipFile(TESTFN2, 'w') as orig_zip:
            for data in 'abcdefghijklmnop':
                zinfo = zipfile.ZipInfo(data)
                zinfo.flag_bits |= 0x08  # Include an extended local header.
                orig_zip.writestr(zinfo, data)

    def test_close(self):
        """Check that the zipfile is closed after the 'with' block."""
        with zipfile.ZipFile(TESTFN2, "w") as zipfp:
            for fpath, fdata in SMALL_TEST_DATA:
                zipfp.writestr(fpath, fdata)
                self.assertTrue(zipfp.fp is not None, 'zipfp is not open')
        self.assertTrue(zipfp.fp is None, 'zipfp is not closed')

        with zipfile.ZipFile(TESTFN2, "r") as zipfp:
            self.assertTrue(zipfp.fp is not None, 'zipfp is not open')
        self.assertTrue(zipfp.fp is None, 'zipfp is not closed')

    def test_close_on_exception(self):
        """Check that the zipfile is closed if an exception is raised in the
        'with' block."""
        with zipfile.ZipFile(TESTFN2, "w") as zipfp:
            for fpath, fdata in SMALL_TEST_DATA:
                zipfp.writestr(fpath, fdata)

        try:
            with zipfile.ZipFile(TESTFN2, "r") as zipfp2:
                raise zipfile.BadZipfile()
        except zipfile.BadZipfile:
            self.assertTrue(zipfp2.fp is None, 'zipfp is not closed')

    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):
        with zipfile.ZipFile(f, "w", compression) as zipfp:
            self.assertRaises(zipfile.LargeZipFile,
                    zipfp.write, TESTFN, "another.name")

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

    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
        with zipfile.ZipFile(f, "w", compression, allowZip64=True) as zipfp:
            zipfp.write(TESTFN, "another.name")
            zipfp.write(TESTFN, TESTFN)
            zipfp.writestr("strfile", self.data)

        # Read the ZIP archive
        with zipfile.ZipFile(f, "r", compression) as zipfp:
            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()

    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):
        with zipfile.ZipFile(TESTFN2, "w", zipfile.ZIP_STORED,
                             allowZip64=True) as zipfp:
            zipfp.write(TESTFN, "/absolute")

        with zipfile.ZipFile(TESTFN2, "r", zipfile.ZIP_STORED) as zipfp:
            self.assertEqual(zipfp.namelist(), ["absolute"])

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


class PyZipFileTests(unittest.TestCase):
    def test_write_pyfile(self):
        with zipfile.PyZipFile(TemporaryFile(), "w") as zipfp:
            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())

        with zipfile.PyZipFile(TemporaryFile(), "w") as zipfp:
            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())

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

        with zipfile.PyZipFile(TemporaryFile(), "w") as zipfp:
            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):
        with zipfile.PyZipFile(TemporaryFile(), "w") as zipfp:
            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):
        with zipfile.ZipFile(TESTFN, "w") as zf:
            zf.writestr("foo.txt", "Test for unicode filename")
            zf.writestr("\xf6.txt", "Test for unicode filename")

        with zipfile.ZipFile(TESTFN, "r") as zf:
            self.assertEqual(zf.filelist[0].filename, "foo.txt")
            self.assertEqual(zf.filelist[1].filename, "\xf6.txt")

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

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

        with zipfile.ZipFile(TESTFN, 'r') as zf:
            self.assertEqual(zf.read(filename), content)

    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
        with zipfile.ZipFile(TESTFN, mode="w") as zipf:
            zipf.writestr("foo.txt", b"O, for a Muse of Fire!")

        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()
        with zipfile.ZipFile(data, mode="w") as zipf:
            zipf.writestr("foo.txt", "O, for a Muse of Fire!")

        # 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
        with zipfile.ZipFile(TESTFN, mode="w") as zipf:
            zipf.writestr("foo.txt", "O, for a Muse of Fire!")

        with zipfile.ZipFile(TESTFN, mode="r") as zipf:
        # read the data to make sure the file is there
            zipf.read("foo.txt")
            self.assertRaises(RuntimeError, zipf.open, "foo.txt", "q")

    def test_read0(self):
        # Check that calling read(0) on a ZipExtFile object returns an empty
        # string and doesn't advance file pointer
        with zipfile.ZipFile(TESTFN, mode="w") as zipf:
            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!")

    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
        with zipfile.ZipFile(TESTFN, mode="w") as zipf:
            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
        with zipfile.ZipFile(TESTFN, mode="w") as zipf:
            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
        with zipfile.ZipFile(TESTFN, mode="w") as zipf:
            self.assertEqual(zipf.comment, b'')
            zipf.writestr("foo.txt", "O, for a Muse of Fire!")

        with zipfile.ZipFile(TESTFN, mode="r") as zipfr:
            self.assertEqual(zipfr.comment, b'')

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

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

        with zipfile.ZipFile(TESTFN, mode="r") as zipfr:
            self.assertEqual(zipfr.comment, comment2)

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

    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
        with zipfile.ZipFile(f, "w", compression) as zipfp:
            zipfp.write(TESTFN, "another.name")
            zipfp.write(TESTFN, TESTFN)

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

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

    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
        with zipfile.ZipFile(f, "r", compression) as zipfp:
            zipdata1 = []
            zipopen1 = zipfp.open(TESTFN)
            while True:
                read_data = zipopen1.read(256)
                if not read_data:
                    break
                zipdata1.append(read_data)

            zipdata2 = []
            zipopen2 = zipfp.open("another.name")
            while True:
                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)

    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
        with zipfile.ZipFile(f, "r", compression) as zipfp:
            zipdata1 = []
            zipopen1 = zipfp.open(TESTFN)
            while True:
                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)

    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
        with zipfile.ZipFile(TESTFN2, "w", zipfile.ZIP_DEFLATED) as zipfp:
            zipfp.writestr('ones', '1'*FIXEDTEST_SIZE)
            zipfp.writestr('twos', '2'*FIXEDTEST_SIZE)

    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.
        with zipfile.ZipFile(TESTFN2, mode="r") as zipf:
            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)

    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.
        with zipfile.ZipFile(TESTFN2, mode="r") as zipf:
            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)

    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.
        with zipfile.ZipFile(TESTFN2, mode="r") as zipf:
            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)

    def tearDown(self):
        unlink(TESTFN2)


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

    def test_extract_dir(self):
        with zipfile.ZipFile(findfile("zipdir.zip")) as zipf:
            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
        with zipfile.ZipFile(f, "w", compression) as zipfp:
            for fn in self.arcfiles.values():
                zipfp.write(fn, fn)

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

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

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

        # Read the ZIP archive
        with zipfile.ZipFile(f, "r") as zipfp:
            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')

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

        # Read the ZIP archive
        with zipfile.ZipFile(f, "r") as zipfp:
            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')

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

        # Read the ZIP archive
        with zipfile.ZipFile(f, "r") as zipfp:
            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')

    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()