Revert "Make Catapult build as a part of Chromium under Python 3."

This reverts commit 25c6e09018bf063da06bdd5e23b049d22326e0ab.

Reason for revert: Blocking catapult roll https://chromium-review.googlesource.com/c/chromium/src/+/2445369

Original change's description:
> Make Catapult build as a part of Chromium under Python 3.
>
> This CL fixes a number of Python3-specific issues in
> Catapult that show up when you try to build Chromium with
> Python3.
>
> Nothing in this CL should cause Python3 to be required, or
> produce any other functional changes.
>
> See https://crrev.com/c/2333868 for the roll-up Chromium patch,
> which also has multiple other dependencies.
>
> Bug: chromium:1112471
> Change-Id: Ic4766a7ff2915c822809c8d0252936325bb53305
> Reviewed-on: https://chromium-review.googlesource.com/c/catapult/+/2330805
> Commit-Queue: Dirk Pranke <dpranke@google.com>
> Reviewed-by: John Chen <johnchen@chromium.org>

TBR=dpranke@google.com,johnchen@chromium.org

Change-Id: I64f71e8530522fbf0e85994baa1da7f982c46bd1
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:1112471
Reviewed-on: https://chromium-review.googlesource.com/c/catapult/+/2446711
Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
diff --git a/BUILD.gn b/BUILD.gn
index 4f4a440..aa6e5d0 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -99,6 +99,7 @@
     "third_party/urllib3/",
     "third_party/webapp2/",
     "third_party/webtest/",
+    "third_party/zipfile/",
   ]
 
   data_deps += [
diff --git a/common/py_vulcanize/py_vulcanize/generate.py b/common/py_vulcanize/py_vulcanize/generate.py
index 06f8f4a..8af3731 100644
--- a/common/py_vulcanize/py_vulcanize/generate.py
+++ b/common/py_vulcanize/py_vulcanize/generate.py
@@ -207,8 +207,7 @@
     p = subprocess.Popen(rcssmin_args,
                          stdin=subprocess.PIPE,
                          stdout=subprocess.PIPE,
-                         stderr=subprocess.PIPE, 
-                         universal_newlines=True)
+                         stderr=subprocess.PIPE)
     res = p.communicate(input=css_text)
     errorcode = p.wait()
     if errorcode != 0:
diff --git a/common/py_vulcanize/py_vulcanize/parse_html_deps.py b/common/py_vulcanize/py_vulcanize/parse_html_deps.py
index 66f8fda..88ce218 100644
--- a/common/py_vulcanize/py_vulcanize/parse_html_deps.py
+++ b/common/py_vulcanize/py_vulcanize/parse_html_deps.py
@@ -15,6 +15,7 @@
 from py_vulcanize import strip_js_comments
 import six
 
+
 def _AddToPathIfNeeded(path):
   if path not in sys.path:
     sys.path.insert(0, path)
@@ -134,7 +135,7 @@
 
 def _CreateSoupWithoutHeadOrBody(html):
   soupCopy = bs4.BeautifulSoup(html, 'html5lib')
-  soup = bs4.BeautifulSoup('', 'html5lib')
+  soup = bs4.BeautifulSoup()
   soup.reset()
   if soupCopy.head:
     for n in soupCopy.head.contents:
diff --git a/common/py_vulcanize/py_vulcanize/resource_loader.py b/common/py_vulcanize/py_vulcanize/resource_loader.py
index c966a9d..015adaa 100644
--- a/common/py_vulcanize/py_vulcanize/resource_loader.py
+++ b/common/py_vulcanize/py_vulcanize/resource_loader.py
@@ -59,7 +59,7 @@
       return None
 
     # Sort by length. Longest match wins.
-    candidate_paths.sort(key=(lambda x: len(x)))
+    candidate_paths.sort(lambda x, y: len(x) - len(y))
     longest_candidate = candidate_paths[-1]
     return resource_module.Resource(longest_candidate, absolute_path, binary)
 
diff --git a/dependency_manager/dependency_manager/dependency_manager_util.py b/dependency_manager/dependency_manager/dependency_manager_util.py
index a8e21b8..ca0174e 100644
--- a/dependency_manager/dependency_manager/dependency_manager_util.py
+++ b/dependency_manager/dependency_manager/dependency_manager_util.py
@@ -7,9 +7,7 @@
 import stat
 import subprocess
 import sys
-import zipfile
-
-import six
+import zipfile_2_7_13 as zipfile
 
 from dependency_manager import exceptions
 
@@ -19,7 +17,7 @@
     os.chmod(path, stat.S_IWRITE)
     func(path)
   else:
-    six.reraise(*execinfo)
+    raise execinfo[0], execinfo[1], execinfo[2]
 
 
 def RemoveDir(dir_path):
diff --git a/devil/devil/android/decorators.py b/devil/devil/android/decorators.py
index dd713d1..0b3778a 100644
--- a/devil/devil/android/decorators.py
+++ b/devil/devil/android/decorators.py
@@ -9,8 +9,6 @@
 import itertools
 import sys
 
-import six
-
 from devil.android import device_errors
 from devil.utils import cmd_helper
 from devil.utils import reraiser_thread
@@ -62,11 +60,10 @@
         return timeout_retry.Run(
             impl, timeout, retries, desc=desc, retry_if_func=retry_if_func)
     except reraiser_thread.TimeoutError as e:
-      six.reraise(device_errors.CommandTimeoutError(str(e)), None,
-                  (sys.exc_info()[2]))
+      raise device_errors.CommandTimeoutError(str(e)), None, (sys.exc_info()[2])
     except cmd_helper.TimeoutError as e:
-      six.reraise(device_errors.CommandTimeoutError(str(e)), None,
-                  (sys.exc_info()[2]))
+      raise device_errors.CommandTimeoutError(
+          str(e), output=e.output), None, (sys.exc_info()[2])
 
   return timeout_retry_wrapper
 
diff --git a/devil/devil/android/device_utils.py b/devil/devil/android/device_utils.py
index 405b25b..0880deb 100644
--- a/devil/devil/android/device_utils.py
+++ b/devil/devil/android/device_utils.py
@@ -3541,7 +3541,7 @@
     return json.dumps(obj, separators=(',', ':'))
 
   @classmethod
-  def parallel(cls, devices, asynch=False):
+  def parallel(cls, devices, async=False):
     """Creates a Parallelizer to operate over the provided list of devices.
 
     Args:
@@ -3555,7 +3555,7 @@
       A Parallelizer operating over |devices|.
     """
     devices = [d if isinstance(d, cls) else cls(d) for d in devices]
-    if asynch:
+    if async:
       return parallelizer.Parallelizer(devices)
     else:
       return parallelizer.SyncParallelizer(devices)
diff --git a/devil/devil/android/md5sum.py b/devil/devil/android/md5sum.py
index e03627f..8adf4ef 100644
--- a/devil/devil/android/md5sum.py
+++ b/devil/devil/android/md5sum.py
@@ -4,9 +4,9 @@
 
 import base64
 import gzip
-import io
 import os
 import re
+import StringIO
 
 from devil import devil_env
 from devil.android import device_errors
@@ -47,14 +47,13 @@
     raise IOError('File not built: %s' % md5sum_bin_host_path)
   out = ""
   for i in range(0, len(paths), _MAX_PATHS_PER_INVOCATION):
-    mem_file = io.BytesIO()
+    mem_file = StringIO.StringIO()
     compressed = gzip.GzipFile(fileobj=mem_file, mode="wb")
     compressed.write(";".join(
         [os.path.realpath(p) for p in paths[i:i+_MAX_PATHS_PER_INVOCATION]]))
     compressed.close()
     compressed_paths = base64.b64encode(mem_file.getvalue())
-    out += cmd_helper.GetCmdOutput([md5sum_bin_host_path, "-gz",
-        compressed_paths])
+    out += cmd_helper.GetCmdOutput([md5sum_bin_host_path, "-gz", compressed_paths])
 
   return dict(zip(paths, out.splitlines()))
 
@@ -98,7 +97,7 @@
   # Make sure it can find libbase.so
   md5sum_script += 'export LD_LIBRARY_PATH=%s;' % MD5SUM_DEVICE_LIB_PATH
   for i in range(0, len(paths), _MAX_PATHS_PER_INVOCATION):
-    mem_file = io.BytesIO()
+    mem_file = StringIO.StringIO()
     compressed = gzip.GzipFile(fileobj=mem_file, mode="wb")
     compressed.write(";".join(paths[i:i+_MAX_PATHS_PER_INVOCATION]))
     compressed.close()
diff --git a/devil/devil/android/sdk/adb_compatibility_devicetest.py b/devil/devil/android/sdk/adb_compatibility_devicetest.py
index d4e63ad..d2c2d4f 100644
--- a/devil/devil/android/sdk/adb_compatibility_devicetest.py
+++ b/devil/devil/android/sdk/adb_compatibility_devicetest.py
@@ -11,10 +11,6 @@
 import sys
 import unittest
 
-if sys.version_info.major >= 3:
-  basestring = str  # pylint: disable=redefined-builtin
-
-
 _CATAPULT_BASE_DIR = os.path.abspath(
     os.path.join(os.path.dirname(__file__), '..', '..', '..', '..'))
 
@@ -104,7 +100,7 @@
   def testShell(self):
     under_test = self.getTestInstance()
     shell_ls_result = under_test.Shell('ls')
-    self.assertIsInstance(shell_ls_result, basestring)
+    self.assertIsInstance(shell_ls_result, str)
     self.assertTrue(bool(shell_ls_result))
 
   def testShell_failed(self):
@@ -115,7 +111,7 @@
   def testShell_externalStorageDefined(self):
     under_test = self.getTestInstance()
     external_storage = under_test.Shell('echo $EXTERNAL_STORAGE')
-    self.assertIsInstance(external_storage, basestring)
+    self.assertIsInstance(external_storage, str)
     self.assertTrue(posixpath.isabs(external_storage))
 
   @contextlib.contextmanager
diff --git a/devil/devil/android/tools/video_recorder.py b/devil/devil/android/tools/video_recorder.py
index 9b892e4..984931f 100755
--- a/devil/devil/android/tools/video_recorder.py
+++ b/devil/devil/android/tools/video_recorder.py
@@ -164,7 +164,7 @@
 
   parallel_devices = device_utils.DeviceUtils.parallel(script_common.GetDevices(
       args.devices, args.denylist_file),
-                                                       asynch=True)
+                                                       async=True)
   stop_recording = threading.Event()
   running_recording = parallel_devices.pMap(record_video, stop_recording)
   print 'Recording. Press Enter to stop.',
diff --git a/devil/devil/utils/cmd_helper.py b/devil/devil/utils/cmd_helper.py
index f286009..634c971 100644
--- a/devil/devil/utils/cmd_helper.py
+++ b/devil/devil/utils/cmd_helper.py
@@ -10,7 +10,7 @@
 import select
 import signal
 import string
-import io
+import StringIO
 import subprocess
 import sys
 import time
@@ -23,10 +23,7 @@
 
 # Cache the string-escape codec to ensure subprocess can find it
 # later. Return value doesn't matter.
-if sys.version_info.major == 2:
-  codecs.lookup('string-escape')
-else:
-  unicode = str  # pylint: disable=redefined-builtin
+codecs.lookup('string-escape')
 
 
 def SingleQuote(s):
@@ -103,8 +100,7 @@
           stderr=None,
           shell=None,
           cwd=None,
-          env=None,
-          universal_newlines=None):
+          env=None):
   # preexec_fn isn't supported on windows.
   if sys.platform == 'win32':
     close_fds = (stdin is None and stdout is None and stderr is None)
@@ -122,8 +118,7 @@
       shell=shell,
       close_fds=close_fds,
       env=env,
-      preexec_fn=preexec_fn,
-      universal_newlines=universal_newlines)
+      preexec_fn=preexec_fn)
 
 
 def Call(args, stdout=None, stderr=None, shell=None, cwd=None, env=None):
@@ -457,20 +452,19 @@
     TimeoutError on timeout.
   """
   _ValidateAndLogCommand(args, cwd, shell)
-  output = io.StringIO()
+  output = StringIO.StringIO()
   process = Popen(
       args,
       cwd=cwd,
       shell=shell,
       stdout=subprocess.PIPE,
       stderr=subprocess.STDOUT,
-      env=env,
-      universal_newlines=True)
+      env=env)
   try:
     for data in _IterProcessStdout(process, timeout=timeout):
       if logfile:
         logfile.write(data)
-      output.write(unicode(data))
+      output.write(data)
   except TimeoutError:
     raise TimeoutError(output.getvalue())
 
diff --git a/telemetry/telemetry/internal/platform/android_platform_backend.py b/telemetry/telemetry/internal/platform/android_platform_backend.py
index a8cbf42..f26fc5d 100644
--- a/telemetry/telemetry/internal/platform/android_platform_backend.py
+++ b/telemetry/telemetry/internal/platform/android_platform_backend.py
@@ -100,7 +100,7 @@
     # Start recording the video in parallel to running the story, so that the
     # video recording here does not block running the story (which involve
     # executing additional commands in parallel on the device).
-    parallel_devices = device_utils.DeviceUtils.parallel([device], asynch=True)
+    parallel_devices = device_utils.DeviceUtils.parallel([device], async=True)
     self._runner = parallel_devices.pMap(record_video, self)
 
   def Stop(self, video_path):
diff --git a/third_party/zipfile/LICENSE b/third_party/zipfile/LICENSE
new file mode 100644
index 0000000..84a3337
--- /dev/null
+++ b/third_party/zipfile/LICENSE
@@ -0,0 +1,255 @@
+A. HISTORY OF THE SOFTWARE
+==========================
+
+Python was created in the early 1990s by Guido van Rossum at Stichting
+Mathematisch Centrum (CWI, see http://www.cwi.nl) in the Netherlands
+as a successor of a language called ABC.  Guido remains Python's
+principal author, although it includes many contributions from others.
+
+In 1995, Guido continued his work on Python at the Corporation for
+National Research Initiatives (CNRI, see http://www.cnri.reston.va.us)
+in Reston, Virginia where he released several versions of the
+software.
+
+In May 2000, Guido and the Python core development team moved to
+BeOpen.com to form the BeOpen PythonLabs team.  In October of the same
+year, the PythonLabs team moved to Digital Creations (now Zope
+Corporation, see http://www.zope.com).  In 2001, the Python Software
+Foundation (PSF, see http://www.python.org/psf/) was formed, a
+non-profit organization created specifically to own Python-related
+Intellectual Property.  Zope Corporation is a sponsoring member of
+the PSF.
+
+All Python releases are Open Source (see http://www.opensource.org for
+the Open Source Definition).  Historically, most, but not all, Python
+releases have also been GPL-compatible; the table below summarizes
+the various releases.
+
+    Release         Derived     Year        Owner       GPL-
+                    from                                compatible? (1)
+
+    0.9.0 thru 1.2              1991-1995   CWI         yes
+    1.3 thru 1.5.2  1.2         1995-1999   CNRI        yes
+    1.6             1.5.2       2000        CNRI        no
+    2.0             1.6         2000        BeOpen.com  no
+    1.6.1           1.6         2001        CNRI        yes (2)
+    2.1             2.0+1.6.1   2001        PSF         no
+    2.0.1           2.0+1.6.1   2001        PSF         yes
+    2.1.1           2.1+2.0.1   2001        PSF         yes
+    2.1.2           2.1.1       2002        PSF         yes
+    2.1.3           2.1.2       2002        PSF         yes
+    2.2 and above   2.1.1       2001-now    PSF         yes
+
+Footnotes:
+
+(1) GPL-compatible doesn't mean that we're distributing Python under
+    the GPL.  All Python licenses, unlike the GPL, let you distribute
+    a modified version without making your changes open source.  The
+    GPL-compatible licenses make it possible to combine Python with
+    other software that is released under the GPL; the others don't.
+
+(2) According to Richard Stallman, 1.6.1 is not GPL-compatible,
+    because its license has a choice of law clause.  According to
+    CNRI, however, Stallman's lawyer has told CNRI's lawyer that 1.6.1
+    is "not incompatible" with the GPL.
+
+Thanks to the many outside volunteers who have worked under Guido's
+direction to make these releases possible.
+
+
+B. TERMS AND CONDITIONS FOR ACCESSING OR OTHERWISE USING PYTHON
+===============================================================
+
+PYTHON SOFTWARE FOUNDATION LICENSE VERSION 2
+--------------------------------------------
+
+1. This LICENSE AGREEMENT is between the Python Software Foundation
+("PSF"), and the Individual or Organization ("Licensee") accessing and
+otherwise using this software ("Python") in source or binary form and
+its associated documentation.
+
+2. Subject to the terms and conditions of this License Agreement, PSF hereby
+grants Licensee a nonexclusive, royalty-free, world-wide license to reproduce,
+analyze, test, perform and/or display publicly, prepare derivative works,
+distribute, and otherwise use Python alone or in any derivative version,
+provided, however, that PSF's License Agreement and PSF's notice of copyright,
+i.e., "Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
+2011, 2012, 2013, 2014, 2015, 2016 Python Software Foundation; All Rights
+Reserved" are retained in Python alone or in any derivative version prepared by
+Licensee.
+
+3. In the event Licensee prepares a derivative work that is based on
+or incorporates Python or any part thereof, and wants to make
+the derivative work available to others as provided herein, then
+Licensee hereby agrees to include in any such work a brief summary of
+the changes made to Python.
+
+4. PSF is making Python available to Licensee on an "AS IS"
+basis.  PSF MAKES NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR
+IMPLIED.  BY WAY OF EXAMPLE, BUT NOT LIMITATION, PSF MAKES NO AND
+DISCLAIMS ANY REPRESENTATION OR WARRANTY OF MERCHANTABILITY OR FITNESS
+FOR ANY PARTICULAR PURPOSE OR THAT THE USE OF PYTHON WILL NOT
+INFRINGE ANY THIRD PARTY RIGHTS.
+
+5. PSF SHALL NOT BE LIABLE TO LICENSEE OR ANY OTHER USERS OF PYTHON
+FOR ANY INCIDENTAL, SPECIAL, OR CONSEQUENTIAL DAMAGES OR LOSS AS
+A RESULT OF MODIFYING, DISTRIBUTING, OR OTHERWISE USING PYTHON,
+OR ANY DERIVATIVE THEREOF, EVEN IF ADVISED OF THE POSSIBILITY THEREOF.
+
+6. This License Agreement will automatically terminate upon a material
+breach of its terms and conditions.
+
+7. Nothing in this License Agreement shall be deemed to create any
+relationship of agency, partnership, or joint venture between PSF and
+Licensee.  This License Agreement does not grant permission to use PSF
+trademarks or trade name in a trademark sense to endorse or promote
+products or services of Licensee, or any third party.
+
+8. By copying, installing or otherwise using Python, Licensee
+agrees to be bound by the terms and conditions of this License
+Agreement.
+
+
+BEOPEN.COM LICENSE AGREEMENT FOR PYTHON 2.0
+-------------------------------------------
+
+BEOPEN PYTHON OPEN SOURCE LICENSE AGREEMENT VERSION 1
+
+1. This LICENSE AGREEMENT is between BeOpen.com ("BeOpen"), having an
+office at 160 Saratoga Avenue, Santa Clara, CA 95051, and the
+Individual or Organization ("Licensee") accessing and otherwise using
+this software in source or binary form and its associated
+documentation ("the Software").
+
+2. Subject to the terms and conditions of this BeOpen Python License
+Agreement, BeOpen hereby grants Licensee a non-exclusive,
+royalty-free, world-wide license to reproduce, analyze, test, perform
+and/or display publicly, prepare derivative works, distribute, and
+otherwise use the Software alone or in any derivative version,
+provided, however, that the BeOpen Python License is retained in the
+Software, alone or in any derivative version prepared by Licensee.
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+3. BeOpen is making the Software available to Licensee on an "AS IS"
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+DISCLAIMS ANY REPRESENTATION OR WARRANTY OF MERCHANTABILITY OR FITNESS
+FOR ANY PARTICULAR PURPOSE OR THAT THE USE OF THE SOFTWARE WILL NOT
+INFRINGE ANY THIRD PARTY RIGHTS.
+
+4. BEOPEN SHALL NOT BE LIABLE TO LICENSEE OR ANY OTHER USERS OF THE
+SOFTWARE FOR ANY INCIDENTAL, SPECIAL, OR CONSEQUENTIAL DAMAGES OR LOSS
+AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THE SOFTWARE, OR ANY
+DERIVATIVE THEREOF, EVEN IF ADVISED OF THE POSSIBILITY THEREOF.
+
+5. This License Agreement will automatically terminate upon a material
+breach of its terms and conditions.
+
+6. This License Agreement shall be governed by and interpreted in all
+respects by the law of the State of California, excluding conflict of
+law provisions.  Nothing in this License Agreement shall be deemed to
+create any relationship of agency, partnership, or joint venture
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+permissions granted on that web page.
+
+7. By copying, installing or otherwise using the software, Licensee
+agrees to be bound by the terms and conditions of this License
+Agreement.
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+
+CNRI LICENSE AGREEMENT FOR PYTHON 1.6.1
+---------------------------------------
+
+1. This LICENSE AGREEMENT is between the Corporation for National
+Research Initiatives, having an office at 1895 Preston White Drive,
+Reston, VA 20191 ("CNRI"), and the Individual or Organization
+("Licensee") accessing and otherwise using Python 1.6.1 software in
+source or binary form and its associated documentation.
+
+2. Subject to the terms and conditions of this License Agreement, CNRI
+hereby grants Licensee a nonexclusive, royalty-free, world-wide
+license to reproduce, analyze, test, perform and/or display publicly,
+prepare derivative works, distribute, and otherwise use Python 1.6.1
+alone or in any derivative version, provided, however, that CNRI's
+License Agreement and CNRI's notice of copyright, i.e., "Copyright (c)
+1995-2001 Corporation for National Research Initiatives; All Rights
+Reserved" are retained in Python 1.6.1 alone or in any derivative
+version prepared by Licensee.  Alternately, in lieu of CNRI's License
+Agreement, Licensee may substitute the following text (omitting the
+quotes): "Python 1.6.1 is made available subject to the terms and
+conditions in CNRI's License Agreement.  This Agreement together with
+Python 1.6.1 may be located on the Internet using the following
+unique, persistent identifier (known as a handle): 1895.22/1013.  This
+Agreement may also be obtained from a proxy server on the Internet
+using the following URL: http://hdl.handle.net/1895.22/1013".
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+3. In the event Licensee prepares a derivative work that is based on
+or incorporates Python 1.6.1 or any part thereof, and wants to make
+the derivative work available to others as provided herein, then
+Licensee hereby agrees to include in any such work a brief summary of
+the changes made to Python 1.6.1.
+
+4. CNRI is making Python 1.6.1 available to Licensee on an "AS IS"
+basis.  CNRI MAKES NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR
+IMPLIED.  BY WAY OF EXAMPLE, BUT NOT LIMITATION, CNRI MAKES NO AND
+DISCLAIMS ANY REPRESENTATION OR WARRANTY OF MERCHANTABILITY OR FITNESS
+FOR ANY PARTICULAR PURPOSE OR THAT THE USE OF PYTHON 1.6.1 WILL NOT
+INFRINGE ANY THIRD PARTY RIGHTS.
+
+5. CNRI SHALL NOT BE LIABLE TO LICENSEE OR ANY OTHER USERS OF PYTHON
+1.6.1 FOR ANY INCIDENTAL, SPECIAL, OR CONSEQUENTIAL DAMAGES OR LOSS AS
+A RESULT OF MODIFYING, DISTRIBUTING, OR OTHERWISE USING PYTHON 1.6.1,
+OR ANY DERIVATIVE THEREOF, EVEN IF ADVISED OF THE POSSIBILITY THEREOF.
+
+6. This License Agreement will automatically terminate upon a material
+breach of its terms and conditions.
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+7. This License Agreement shall be governed by the federal
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+U.S. federal law does not apply, by the law of the Commonwealth of
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+Notwithstanding the foregoing, with regard to derivative works based
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+
+        ACCEPT
+
+
+CWI LICENSE AGREEMENT FOR PYTHON 0.9.0 THROUGH 1.2
+--------------------------------------------------
+
+Copyright (c) 1991 - 1995, Stichting Mathematisch Centrum Amsterdam,
+The Netherlands.  All rights reserved.
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose and without fee is hereby granted,
+provided that the above copyright notice appear in all copies and that
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+permission.
+
+STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
+THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
+FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
+OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
diff --git a/third_party/zipfile/README.chromium b/third_party/zipfile/README.chromium
new file mode 100644
index 0000000..f45d3cf
--- /dev/null
+++ b/third_party/zipfile/README.chromium
@@ -0,0 +1,16 @@
+Name: Python zipfile module
+Short Name: zipfile
+URL: https://github.com/python/cpython/blob/master/Lib/zipfile.py
+Version: 2.7.13
+License: Python
+License File: NOT_SHIPPED
+Security Critical: no
+
+Description:
+This is a copy of the zipfile module from Python 2.7.13. This snapshot was
+taken to workaround a bug in older Python versions such as 2.7.3. See
+<https://bugs.python.org/issue6972> and specifically the fix at
+<https://hg.python.org/cpython/rev/0c5fa35c9f12#l3.11>.
+
+Local Modifications:
+Renamed zipfile.py to zipfile_2_7_13.py to avoid conflicting with system copy.
diff --git a/third_party/zipfile/zipfile_2_7_13.py b/third_party/zipfile/zipfile_2_7_13.py
new file mode 100644
index 0000000..1d10650
--- /dev/null
+++ b/third_party/zipfile/zipfile_2_7_13.py
@@ -0,0 +1,1543 @@
+"""
+Read and write ZIP files.
+"""
+import struct, os, time, sys, shutil
+import binascii, cStringIO, stat
+import io
+import re
+import string
+
+try:
+    import zlib # We may need its compression method
+    crc32 = zlib.crc32
+except ImportError:
+    zlib = None
+    crc32 = binascii.crc32
+
+__all__ = ["BadZipfile", "error", "ZIP_STORED", "ZIP_DEFLATED", "is_zipfile",
+           "ZipInfo", "ZipFile", "PyZipFile", "LargeZipFile" ]
+
+class BadZipfile(Exception):
+    pass
+
+
+class LargeZipFile(Exception):
+    """
+    Raised when writing a zipfile, the zipfile requires ZIP64 extensions
+    and those extensions are disabled.
+    """
+
+error = BadZipfile      # The exception raised by this module
+
+ZIP64_LIMIT = (1 << 31) - 1
+ZIP_FILECOUNT_LIMIT = (1 << 16) - 1
+ZIP_MAX_COMMENT = (1 << 16) - 1
+
+# constants for Zip file compression methods
+ZIP_STORED = 0
+ZIP_DEFLATED = 8
+# Other ZIP compression methods not supported
+
+# Below are some formats and associated data for reading/writing headers using
+# the struct module.  The names and structures of headers/records are those used
+# in the PKWARE description of the ZIP file format:
+#     http://www.pkware.com/documents/casestudies/APPNOTE.TXT
+# (URL valid as of January 2008)
+
+# The "end of central directory" structure, magic number, size, and indices
+# (section V.I in the format document)
+structEndArchive = "<4s4H2LH"
+stringEndArchive = "PK\005\006"
+sizeEndCentDir = struct.calcsize(structEndArchive)
+
+_ECD_SIGNATURE = 0
+_ECD_DISK_NUMBER = 1
+_ECD_DISK_START = 2
+_ECD_ENTRIES_THIS_DISK = 3
+_ECD_ENTRIES_TOTAL = 4
+_ECD_SIZE = 5
+_ECD_OFFSET = 6
+_ECD_COMMENT_SIZE = 7
+# These last two indices are not part of the structure as defined in the
+# spec, but they are used internally by this module as a convenience
+_ECD_COMMENT = 8
+_ECD_LOCATION = 9
+
+# The "central directory" structure, magic number, size, and indices
+# of entries in the structure (section V.F in the format document)
+structCentralDir = "<4s4B4HL2L5H2L"
+stringCentralDir = "PK\001\002"
+sizeCentralDir = struct.calcsize(structCentralDir)
+
+# indexes of entries in the central directory structure
+_CD_SIGNATURE = 0
+_CD_CREATE_VERSION = 1
+_CD_CREATE_SYSTEM = 2
+_CD_EXTRACT_VERSION = 3
+_CD_EXTRACT_SYSTEM = 4
+_CD_FLAG_BITS = 5
+_CD_COMPRESS_TYPE = 6
+_CD_TIME = 7
+_CD_DATE = 8
+_CD_CRC = 9
+_CD_COMPRESSED_SIZE = 10
+_CD_UNCOMPRESSED_SIZE = 11
+_CD_FILENAME_LENGTH = 12
+_CD_EXTRA_FIELD_LENGTH = 13
+_CD_COMMENT_LENGTH = 14
+_CD_DISK_NUMBER_START = 15
+_CD_INTERNAL_FILE_ATTRIBUTES = 16
+_CD_EXTERNAL_FILE_ATTRIBUTES = 17
+_CD_LOCAL_HEADER_OFFSET = 18
+
+# The "local file header" structure, magic number, size, and indices
+# (section V.A in the format document)
+structFileHeader = "<4s2B4HL2L2H"
+stringFileHeader = "PK\003\004"
+sizeFileHeader = struct.calcsize(structFileHeader)
+
+_FH_SIGNATURE = 0
+_FH_EXTRACT_VERSION = 1
+_FH_EXTRACT_SYSTEM = 2
+_FH_GENERAL_PURPOSE_FLAG_BITS = 3
+_FH_COMPRESSION_METHOD = 4
+_FH_LAST_MOD_TIME = 5
+_FH_LAST_MOD_DATE = 6
+_FH_CRC = 7
+_FH_COMPRESSED_SIZE = 8
+_FH_UNCOMPRESSED_SIZE = 9
+_FH_FILENAME_LENGTH = 10
+_FH_EXTRA_FIELD_LENGTH = 11
+
+# The "Zip64 end of central directory locator" structure, magic number, and size
+structEndArchive64Locator = "<4sLQL"
+stringEndArchive64Locator = "PK\x06\x07"
+sizeEndCentDir64Locator = struct.calcsize(structEndArchive64Locator)
+
+# The "Zip64 end of central directory" record, magic number, size, and indices
+# (section V.G in the format document)
+structEndArchive64 = "<4sQ2H2L4Q"
+stringEndArchive64 = "PK\x06\x06"
+sizeEndCentDir64 = struct.calcsize(structEndArchive64)
+
+_CD64_SIGNATURE = 0
+_CD64_DIRECTORY_RECSIZE = 1
+_CD64_CREATE_VERSION = 2
+_CD64_EXTRACT_VERSION = 3
+_CD64_DISK_NUMBER = 4
+_CD64_DISK_NUMBER_START = 5
+_CD64_NUMBER_ENTRIES_THIS_DISK = 6
+_CD64_NUMBER_ENTRIES_TOTAL = 7
+_CD64_DIRECTORY_SIZE = 8
+_CD64_OFFSET_START_CENTDIR = 9
+
+def _check_zipfile(fp):
+    try:
+        if _EndRecData(fp):
+            return True         # file has correct magic number
+    except IOError:
+        pass
+    return False
+
+def is_zipfile(filename):
+    """Quickly see if a file is a ZIP file by checking the magic number.
+
+    The filename argument may be a file or file-like object too.
+    """
+    result = False
+    try:
+        if hasattr(filename, "read"):
+            result = _check_zipfile(fp=filename)
+        else:
+            with open(filename, "rb") as fp:
+                result = _check_zipfile(fp)
+    except IOError:
+        pass
+    return result
+
+def _EndRecData64(fpin, offset, endrec):
+    """
+    Read the ZIP64 end-of-archive records and use that to update endrec
+    """
+    try:
+        fpin.seek(offset - sizeEndCentDir64Locator, 2)
+    except IOError:
+        # If the seek fails, the file is not large enough to contain a ZIP64
+        # end-of-archive record, so just return the end record we were given.
+        return endrec
+
+    data = fpin.read(sizeEndCentDir64Locator)
+    if len(data) != sizeEndCentDir64Locator:
+        return endrec
+    sig, diskno, reloff, disks = struct.unpack(structEndArchive64Locator, data)
+    if sig != stringEndArchive64Locator:
+        return endrec
+
+    if diskno != 0 or disks != 1:
+        raise BadZipfile("zipfiles that span multiple disks are not supported")
+
+    # Assume no 'zip64 extensible data'
+    fpin.seek(offset - sizeEndCentDir64Locator - sizeEndCentDir64, 2)
+    data = fpin.read(sizeEndCentDir64)
+    if len(data) != sizeEndCentDir64:
+        return endrec
+    sig, sz, create_version, read_version, disk_num, disk_dir, \
+            dircount, dircount2, dirsize, diroffset = \
+            struct.unpack(structEndArchive64, data)
+    if sig != stringEndArchive64:
+        return endrec
+
+    # Update the original endrec using data from the ZIP64 record
+    endrec[_ECD_SIGNATURE] = sig
+    endrec[_ECD_DISK_NUMBER] = disk_num
+    endrec[_ECD_DISK_START] = disk_dir
+    endrec[_ECD_ENTRIES_THIS_DISK] = dircount
+    endrec[_ECD_ENTRIES_TOTAL] = dircount2
+    endrec[_ECD_SIZE] = dirsize
+    endrec[_ECD_OFFSET] = diroffset
+    return endrec
+
+
+def _EndRecData(fpin):
+    """Return data from the "End of Central Directory" record, or None.
+
+    The data is a list of the nine items in the ZIP "End of central dir"
+    record followed by a tenth item, the file seek offset of this record."""
+
+    # Determine file size
+    fpin.seek(0, 2)
+    filesize = fpin.tell()
+
+    # Check to see if this is ZIP file with no archive comment (the
+    # "end of central directory" structure should be the last item in the
+    # file if this is the case).
+    try:
+        fpin.seek(-sizeEndCentDir, 2)
+    except IOError:
+        return None
+    data = fpin.read()
+    if (len(data) == sizeEndCentDir and
+        data[0:4] == stringEndArchive and
+        data[-2:] == b"\000\000"):
+        # the signature is correct and there's no comment, unpack structure
+        endrec = struct.unpack(structEndArchive, data)
+        endrec=list(endrec)
+
+        # Append a blank comment and record start offset
+        endrec.append("")
+        endrec.append(filesize - sizeEndCentDir)
+
+        # Try to read the "Zip64 end of central directory" structure
+        return _EndRecData64(fpin, -sizeEndCentDir, endrec)
+
+    # Either this is not a ZIP file, or it is a ZIP file with an archive
+    # comment.  Search the end of the file for the "end of central directory"
+    # record signature. The comment is the last item in the ZIP file and may be
+    # up to 64K long.  It is assumed that the "end of central directory" magic
+    # number does not appear in the comment.
+    maxCommentStart = max(filesize - (1 << 16) - sizeEndCentDir, 0)
+    fpin.seek(maxCommentStart, 0)
+    data = fpin.read()
+    start = data.rfind(stringEndArchive)
+    if start >= 0:
+        # found the magic number; attempt to unpack and interpret
+        recData = data[start:start+sizeEndCentDir]
+        if len(recData) != sizeEndCentDir:
+            # Zip file is corrupted.
+            return None
+        endrec = list(struct.unpack(structEndArchive, recData))
+        commentSize = endrec[_ECD_COMMENT_SIZE] #as claimed by the zip file
+        comment = data[start+sizeEndCentDir:start+sizeEndCentDir+commentSize]
+        endrec.append(comment)
+        endrec.append(maxCommentStart + start)
+
+        # Try to read the "Zip64 end of central directory" structure
+        return _EndRecData64(fpin, maxCommentStart + start - filesize,
+                             endrec)
+
+    # Unable to find a valid end of central directory structure
+    return None
+
+
+class ZipInfo (object):
+    """Class with attributes describing each file in the ZIP archive."""
+
+    __slots__ = (
+            'orig_filename',
+            'filename',
+            'date_time',
+            'compress_type',
+            'comment',
+            'extra',
+            'create_system',
+            'create_version',
+            'extract_version',
+            'reserved',
+            'flag_bits',
+            'volume',
+            'internal_attr',
+            'external_attr',
+            'header_offset',
+            'CRC',
+            'compress_size',
+            'file_size',
+            '_raw_time',
+        )
+
+    def __init__(self, filename="NoName", date_time=(1980,1,1,0,0,0)):
+        self.orig_filename = filename   # Original file name in archive
+
+        # Terminate the file name at the first null byte.  Null bytes in file
+        # names are used as tricks by viruses in archives.
+        null_byte = filename.find(chr(0))
+        if null_byte >= 0:
+            filename = filename[0:null_byte]
+        # This is used to ensure paths in generated ZIP files always use
+        # forward slashes as the directory separator, as required by the
+        # ZIP format specification.
+        if os.sep != "/" and os.sep in filename:
+            filename = filename.replace(os.sep, "/")
+
+        self.filename = filename        # Normalized file name
+        self.date_time = date_time      # year, month, day, hour, min, sec
+
+        if date_time[0] < 1980:
+            raise ValueError('ZIP does not support timestamps before 1980')
+
+        # Standard values:
+        self.compress_type = ZIP_STORED # Type of compression for the file
+        self.comment = ""               # Comment for each file
+        self.extra = ""                 # ZIP extra data
+        if sys.platform == 'win32':
+            self.create_system = 0          # System which created ZIP archive
+        else:
+            # Assume everything else is unix-y
+            self.create_system = 3          # System which created ZIP archive
+        self.create_version = 20        # Version which created ZIP archive
+        self.extract_version = 20       # Version needed to extract archive
+        self.reserved = 0               # Must be zero
+        self.flag_bits = 0              # ZIP flag bits
+        self.volume = 0                 # Volume number of file header
+        self.internal_attr = 0          # Internal attributes
+        self.external_attr = 0          # External file attributes
+        # Other attributes are set by class ZipFile:
+        # header_offset         Byte offset to the file header
+        # CRC                   CRC-32 of the uncompressed file
+        # compress_size         Size of the compressed file
+        # file_size             Size of the uncompressed file
+
+    def FileHeader(self, zip64=None):
+        """Return the per-file header as a string."""
+        dt = self.date_time
+        dosdate = (dt[0] - 1980) << 9 | dt[1] << 5 | dt[2]
+        dostime = dt[3] << 11 | dt[4] << 5 | (dt[5] // 2)
+        if self.flag_bits & 0x08:
+            # Set these to zero because we write them after the file data
+            CRC = compress_size = file_size = 0
+        else:
+            CRC = self.CRC
+            compress_size = self.compress_size
+            file_size = self.file_size
+
+        extra = self.extra
+
+        if zip64 is None:
+            zip64 = file_size > ZIP64_LIMIT or compress_size > ZIP64_LIMIT
+        if zip64:
+            fmt = '<HHQQ'
+            extra = extra + struct.pack(fmt,
+                    1, struct.calcsize(fmt)-4, file_size, compress_size)
+        if file_size > ZIP64_LIMIT or compress_size > ZIP64_LIMIT:
+            if not zip64:
+                raise LargeZipFile("Filesize would require ZIP64 extensions")
+            # File is larger than what fits into a 4 byte integer,
+            # fall back to the ZIP64 extension
+            file_size = 0xffffffff
+            compress_size = 0xffffffff
+            self.extract_version = max(45, self.extract_version)
+            self.create_version = max(45, self.extract_version)
+
+        filename, flag_bits = self._encodeFilenameFlags()
+        header = struct.pack(structFileHeader, stringFileHeader,
+                 self.extract_version, self.reserved, flag_bits,
+                 self.compress_type, dostime, dosdate, CRC,
+                 compress_size, file_size,
+                 len(filename), len(extra))
+        return header + filename + extra
+
+    def _encodeFilenameFlags(self):
+        if isinstance(self.filename, unicode):
+            try:
+                return self.filename.encode('ascii'), self.flag_bits
+            except UnicodeEncodeError:
+                return self.filename.encode('utf-8'), self.flag_bits | 0x800
+        else:
+            return self.filename, self.flag_bits
+
+    def _decodeFilename(self):
+        if self.flag_bits & 0x800:
+            return self.filename.decode('utf-8')
+        else:
+            return self.filename
+
+    def _decodeExtra(self):
+        # Try to decode the extra field.
+        extra = self.extra
+        unpack = struct.unpack
+        while len(extra) >= 4:
+            tp, ln = unpack('<HH', extra[:4])
+            if tp == 1:
+                if ln >= 24:
+                    counts = unpack('<QQQ', extra[4:28])
+                elif ln == 16:
+                    counts = unpack('<QQ', extra[4:20])
+                elif ln == 8:
+                    counts = unpack('<Q', extra[4:12])
+                elif ln == 0:
+                    counts = ()
+                else:
+                    raise RuntimeError, "Corrupt extra field %s"%(ln,)
+
+                idx = 0
+
+                # ZIP64 extension (large files and/or large archives)
+                if self.file_size in (0xffffffffffffffffL, 0xffffffffL):
+                    self.file_size = counts[idx]
+                    idx += 1
+
+                if self.compress_size == 0xFFFFFFFFL:
+                    self.compress_size = counts[idx]
+                    idx += 1
+
+                if self.header_offset == 0xffffffffL:
+                    old = self.header_offset
+                    self.header_offset = counts[idx]
+                    idx+=1
+
+            extra = extra[ln+4:]
+
+
+class _ZipDecrypter:
+    """Class to handle decryption of files stored within a ZIP archive.
+
+    ZIP supports a password-based form of encryption. Even though known
+    plaintext attacks have been found against it, it is still useful
+    to be able to get data out of such a file.
+
+    Usage:
+        zd = _ZipDecrypter(mypwd)
+        plain_char = zd(cypher_char)
+        plain_text = map(zd, cypher_text)
+    """
+
+    def _GenerateCRCTable():
+        """Generate a CRC-32 table.
+
+        ZIP encryption uses the CRC32 one-byte primitive for scrambling some
+        internal keys. We noticed that a direct implementation is faster than
+        relying on binascii.crc32().
+        """
+        poly = 0xedb88320
+        table = [0] * 256
+        for i in range(256):
+            crc = i
+            for j in range(8):
+                if crc & 1:
+                    crc = ((crc >> 1) & 0x7FFFFFFF) ^ poly
+                else:
+                    crc = ((crc >> 1) & 0x7FFFFFFF)
+            table[i] = crc
+        return table
+    crctable = _GenerateCRCTable()
+
+    def _crc32(self, ch, crc):
+        """Compute the CRC32 primitive on one byte."""
+        return ((crc >> 8) & 0xffffff) ^ self.crctable[(crc ^ ord(ch)) & 0xff]
+
+    def __init__(self, pwd):
+        self.key0 = 305419896
+        self.key1 = 591751049
+        self.key2 = 878082192
+        for p in pwd:
+            self._UpdateKeys(p)
+
+    def _UpdateKeys(self, c):
+        self.key0 = self._crc32(c, self.key0)
+        self.key1 = (self.key1 + (self.key0 & 255)) & 4294967295
+        self.key1 = (self.key1 * 134775813 + 1) & 4294967295
+        self.key2 = self._crc32(chr((self.key1 >> 24) & 255), self.key2)
+
+    def __call__(self, c):
+        """Decrypt a single character."""
+        c = ord(c)
+        k = self.key2 | 2
+        c = c ^ (((k * (k^1)) >> 8) & 255)
+        c = chr(c)
+        self._UpdateKeys(c)
+        return c
+
+
+compressor_names = {
+    0: 'store',
+    1: 'shrink',
+    2: 'reduce',
+    3: 'reduce',
+    4: 'reduce',
+    5: 'reduce',
+    6: 'implode',
+    7: 'tokenize',
+    8: 'deflate',
+    9: 'deflate64',
+    10: 'implode',
+    12: 'bzip2',
+    14: 'lzma',
+    18: 'terse',
+    19: 'lz77',
+    97: 'wavpack',
+    98: 'ppmd',
+}
+
+
+class ZipExtFile(io.BufferedIOBase):
+    """File-like object for reading an archive member.
+       Is returned by ZipFile.open().
+    """
+
+    # Max size supported by decompressor.
+    MAX_N = 1 << 31 - 1
+
+    # Read from compressed files in 4k blocks.
+    MIN_READ_SIZE = 4096
+
+    # Search for universal newlines or line chunks.
+    PATTERN = re.compile(r'^(?P<chunk>[^\r\n]+)|(?P<newline>\n|\r\n?)')
+
+    def __init__(self, fileobj, mode, zipinfo, decrypter=None,
+            close_fileobj=False):
+        self._fileobj = fileobj
+        self._decrypter = decrypter
+        self._close_fileobj = close_fileobj
+
+        self._compress_type = zipinfo.compress_type
+        self._compress_size = zipinfo.compress_size
+        self._compress_left = zipinfo.compress_size
+
+        if self._compress_type == ZIP_DEFLATED:
+            self._decompressor = zlib.decompressobj(-15)
+        elif self._compress_type != ZIP_STORED:
+            descr = compressor_names.get(self._compress_type)
+            if descr:
+                raise NotImplementedError("compression type %d (%s)" % (self._compress_type, descr))
+            else:
+                raise NotImplementedError("compression type %d" % (self._compress_type,))
+        self._unconsumed = ''
+
+        self._readbuffer = ''
+        self._offset = 0
+
+        self._universal = 'U' in mode
+        self.newlines = None
+
+        # Adjust read size for encrypted files since the first 12 bytes
+        # are for the encryption/password information.
+        if self._decrypter is not None:
+            self._compress_left -= 12
+
+        self.mode = mode
+        self.name = zipinfo.filename
+
+        if hasattr(zipinfo, 'CRC'):
+            self._expected_crc = zipinfo.CRC
+            self._running_crc = crc32(b'') & 0xffffffff
+        else:
+            self._expected_crc = None
+
+    def readline(self, limit=-1):
+        """Read and return a line from the stream.
+
+        If limit is specified, at most limit bytes will be read.
+        """
+
+        if not self._universal and limit < 0:
+            # Shortcut common case - newline found in buffer.
+            i = self._readbuffer.find('\n', self._offset) + 1
+            if i > 0:
+                line = self._readbuffer[self._offset: i]
+                self._offset = i
+                return line
+
+        if not self._universal:
+            return io.BufferedIOBase.readline(self, limit)
+
+        line = ''
+        while limit < 0 or len(line) < limit:
+            readahead = self.peek(2)
+            if readahead == '':
+                return line
+
+            #
+            # Search for universal newlines or line chunks.
+            #
+            # The pattern returns either a line chunk or a newline, but not
+            # both. Combined with peek(2), we are assured that the sequence
+            # '\r\n' is always retrieved completely and never split into
+            # separate newlines - '\r', '\n' due to coincidental readaheads.
+            #
+            match = self.PATTERN.search(readahead)
+            newline = match.group('newline')
+            if newline is not None:
+                if self.newlines is None:
+                    self.newlines = []
+                if newline not in self.newlines:
+                    self.newlines.append(newline)
+                self._offset += len(newline)
+                return line + '\n'
+
+            chunk = match.group('chunk')
+            if limit >= 0:
+                chunk = chunk[: limit - len(line)]
+
+            self._offset += len(chunk)
+            line += chunk
+
+        return line
+
+    def peek(self, n=1):
+        """Returns buffered bytes without advancing the position."""
+        if n > len(self._readbuffer) - self._offset:
+            chunk = self.read(n)
+            if len(chunk) > self._offset:
+                self._readbuffer = chunk + self._readbuffer[self._offset:]
+                self._offset = 0
+            else:
+                self._offset -= len(chunk)
+
+        # Return up to 512 bytes to reduce allocation overhead for tight loops.
+        return self._readbuffer[self._offset: self._offset + 512]
+
+    def readable(self):
+        return True
+
+    def read(self, n=-1):
+        """Read and return up to n bytes.
+        If the argument is omitted, None, or negative, data is read and returned until EOF is reached..
+        """
+        buf = ''
+        if n is None:
+            n = -1
+        while True:
+            if n < 0:
+                data = self.read1(n)
+            elif n > len(buf):
+                data = self.read1(n - len(buf))
+            else:
+                return buf
+            if len(data) == 0:
+                return buf
+            buf += data
+
+    def _update_crc(self, newdata, eof):
+        # Update the CRC using the given data.
+        if self._expected_crc is None:
+            # No need to compute the CRC if we don't have a reference value
+            return
+        self._running_crc = crc32(newdata, self._running_crc) & 0xffffffff
+        # Check the CRC if we're at the end of the file
+        if eof and self._running_crc != self._expected_crc:
+            raise BadZipfile("Bad CRC-32 for file %r" % self.name)
+
+    def read1(self, n):
+        """Read up to n bytes with at most one read() system call."""
+
+        # Simplify algorithm (branching) by transforming negative n to large n.
+        if n < 0 or n is None:
+            n = self.MAX_N
+
+        # Bytes available in read buffer.
+        len_readbuffer = len(self._readbuffer) - self._offset
+
+        # Read from file.
+        if self._compress_left > 0 and n > len_readbuffer + len(self._unconsumed):
+            nbytes = n - len_readbuffer - len(self._unconsumed)
+            nbytes = max(nbytes, self.MIN_READ_SIZE)
+            nbytes = min(nbytes, self._compress_left)
+
+            data = self._fileobj.read(nbytes)
+            self._compress_left -= len(data)
+
+            if data and self._decrypter is not None:
+                data = ''.join(map(self._decrypter, data))
+
+            if self._compress_type == ZIP_STORED:
+                self._update_crc(data, eof=(self._compress_left==0))
+                self._readbuffer = self._readbuffer[self._offset:] + data
+                self._offset = 0
+            else:
+                # Prepare deflated bytes for decompression.
+                self._unconsumed += data
+
+        # Handle unconsumed data.
+        if (len(self._unconsumed) > 0 and n > len_readbuffer and
+            self._compress_type == ZIP_DEFLATED):
+            data = self._decompressor.decompress(
+                self._unconsumed,
+                max(n - len_readbuffer, self.MIN_READ_SIZE)
+            )
+
+            self._unconsumed = self._decompressor.unconsumed_tail
+            eof = len(self._unconsumed) == 0 and self._compress_left == 0
+            if eof:
+                data += self._decompressor.flush()
+
+            self._update_crc(data, eof=eof)
+            self._readbuffer = self._readbuffer[self._offset:] + data
+            self._offset = 0
+
+        # Read from buffer.
+        data = self._readbuffer[self._offset: self._offset + n]
+        self._offset += len(data)
+        return data
+
+    def close(self):
+        try :
+            if self._close_fileobj:
+                self._fileobj.close()
+        finally:
+            super(ZipExtFile, self).close()
+
+
+class ZipFile(object):
+    """ Class with methods to open, read, write, close, list zip files.
+
+    z = ZipFile(file, mode="r", compression=ZIP_STORED, allowZip64=False)
+
+    file: Either the path to the file, or a file-like object.
+          If it is a path, the file will be opened and closed by ZipFile.
+    mode: The mode can be either read "r", write "w" or append "a".
+    compression: ZIP_STORED (no compression) or ZIP_DEFLATED (requires zlib).
+    allowZip64: if True ZipFile will create files with ZIP64 extensions when
+                needed, otherwise it will raise an exception when this would
+                be necessary.
+
+    """
+
+    fp = None                   # Set here since __del__ checks it
+
+    def __init__(self, file, mode="r", compression=ZIP_STORED, allowZip64=False):
+        """Open the ZIP file with mode read "r", write "w" or append "a"."""
+        if mode not in ("r", "w", "a"):
+            raise RuntimeError('ZipFile() requires mode "r", "w", or "a"')
+
+        if compression == ZIP_STORED:
+            pass
+        elif compression == ZIP_DEFLATED:
+            if not zlib:
+                raise RuntimeError,\
+                      "Compression requires the (missing) zlib module"
+        else:
+            raise RuntimeError, "That compression method is not supported"
+
+        self._allowZip64 = allowZip64
+        self._didModify = False
+        self.debug = 0  # Level of printing: 0 through 3
+        self.NameToInfo = {}    # Find file info given name
+        self.filelist = []      # List of ZipInfo instances for archive
+        self.compression = compression  # Method of compression
+        self.mode = key = mode.replace('b', '')[0]
+        self.pwd = None
+        self._comment = ''
+
+        # Check if we were passed a file-like object
+        if isinstance(file, basestring):
+            self._filePassed = 0
+            self.filename = file
+            modeDict = {'r' : 'rb', 'w': 'wb', 'a' : 'r+b'}
+            try:
+                self.fp = open(file, modeDict[mode])
+            except IOError:
+                if mode == 'a':
+                    mode = key = 'w'
+                    self.fp = open(file, modeDict[mode])
+                else:
+                    raise
+        else:
+            self._filePassed = 1
+            self.fp = file
+            self.filename = getattr(file, 'name', None)
+
+        try:
+            if key == 'r':
+                self._RealGetContents()
+            elif key == 'w':
+                # set the modified flag so central directory gets written
+                # even if no files are added to the archive
+                self._didModify = True
+                self._start_disk = self.fp.tell()
+            elif key == 'a':
+                try:
+                    # See if file is a zip file
+                    self._RealGetContents()
+                    # seek to start of directory and overwrite
+                    self.fp.seek(self.start_dir, 0)
+                except BadZipfile:
+                    # file is not a zip file, just append
+                    self.fp.seek(0, 2)
+
+                    # set the modified flag so central directory gets written
+                    # even if no files are added to the archive
+                    self._didModify = True
+                    self._start_disk = self.fp.tell()
+            else:
+                raise RuntimeError('Mode must be "r", "w" or "a"')
+        except:
+            fp = self.fp
+            self.fp = None
+            if not self._filePassed:
+                fp.close()
+            raise
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, type, value, traceback):
+        self.close()
+
+    def _RealGetContents(self):
+        """Read in the table of contents for the ZIP file."""
+        fp = self.fp
+        try:
+            endrec = _EndRecData(fp)
+        except IOError:
+            raise BadZipfile("File is not a zip file")
+        if not endrec:
+            raise BadZipfile, "File is not a zip file"
+        if self.debug > 1:
+            print endrec
+        size_cd = endrec[_ECD_SIZE]             # bytes in central directory
+        offset_cd = endrec[_ECD_OFFSET]         # offset of central directory
+        self._comment = endrec[_ECD_COMMENT]    # archive comment
+
+        # self._start_disk:  Position of the start of ZIP archive
+        # It is zero, unless ZIP was concatenated to another file
+        self._start_disk = endrec[_ECD_LOCATION] - size_cd - offset_cd
+        if endrec[_ECD_SIGNATURE] == stringEndArchive64:
+            # If Zip64 extension structures are present, account for them
+            self._start_disk -= (sizeEndCentDir64 + sizeEndCentDir64Locator)
+
+        if self.debug > 2:
+            inferred = self._start_disk + offset_cd
+            print "given, inferred, offset", offset_cd, inferred, self._start_disk
+        # self.start_dir:  Position of start of central directory
+        self.start_dir = offset_cd + self._start_disk
+        fp.seek(self.start_dir, 0)
+        data = fp.read(size_cd)
+        fp = cStringIO.StringIO(data)
+        total = 0
+        while total < size_cd:
+            centdir = fp.read(sizeCentralDir)
+            if len(centdir) != sizeCentralDir:
+                raise BadZipfile("Truncated central directory")
+            centdir = struct.unpack(structCentralDir, centdir)
+            if centdir[_CD_SIGNATURE] != stringCentralDir:
+                raise BadZipfile("Bad magic number for central directory")
+            if self.debug > 2:
+                print centdir
+            filename = fp.read(centdir[_CD_FILENAME_LENGTH])
+            # Create ZipInfo instance to store file information
+            x = ZipInfo(filename)
+            x.extra = fp.read(centdir[_CD_EXTRA_FIELD_LENGTH])
+            x.comment = fp.read(centdir[_CD_COMMENT_LENGTH])
+            x.header_offset = centdir[_CD_LOCAL_HEADER_OFFSET]
+            (x.create_version, x.create_system, x.extract_version, x.reserved,
+                x.flag_bits, x.compress_type, t, d,
+                x.CRC, x.compress_size, x.file_size) = centdir[1:12]
+            x.volume, x.internal_attr, x.external_attr = centdir[15:18]
+            # Convert date/time code to (year, month, day, hour, min, sec)
+            x._raw_time = t
+            x.date_time = ( (d>>9)+1980, (d>>5)&0xF, d&0x1F,
+                                     t>>11, (t>>5)&0x3F, (t&0x1F) * 2 )
+
+            x._decodeExtra()
+            x.header_offset = x.header_offset + self._start_disk
+            x.filename = x._decodeFilename()
+            self.filelist.append(x)
+            self.NameToInfo[x.filename] = x
+
+            # update total bytes read from central directory
+            total = (total + sizeCentralDir + centdir[_CD_FILENAME_LENGTH]
+                     + centdir[_CD_EXTRA_FIELD_LENGTH]
+                     + centdir[_CD_COMMENT_LENGTH])
+
+            if self.debug > 2:
+                print "total", total
+
+
+    def namelist(self):
+        """Return a list of file names in the archive."""
+        l = []
+        for data in self.filelist:
+            l.append(data.filename)
+        return l
+
+    def infolist(self):
+        """Return a list of class ZipInfo instances for files in the
+        archive."""
+        return self.filelist
+
+    def printdir(self):
+        """Print a table of contents for the zip file."""
+        print "%-46s %19s %12s" % ("File Name", "Modified    ", "Size")
+        for zinfo in self.filelist:
+            date = "%d-%02d-%02d %02d:%02d:%02d" % zinfo.date_time[:6]
+            print "%-46s %s %12d" % (zinfo.filename, date, zinfo.file_size)
+
+    def testzip(self):
+        """Read all the files and check the CRC."""
+        chunk_size = 2 ** 20
+        for zinfo in self.filelist:
+            try:
+                # Read by chunks, to avoid an OverflowError or a
+                # MemoryError with very large embedded files.
+                with self.open(zinfo.filename, "r") as f:
+                    while f.read(chunk_size):     # Check CRC-32
+                        pass
+            except BadZipfile:
+                return zinfo.filename
+
+    def getinfo(self, name):
+        """Return the instance of ZipInfo given 'name'."""
+        info = self.NameToInfo.get(name)
+        if info is None:
+            raise KeyError(
+                'There is no item named %r in the archive' % name)
+
+        return info
+
+    def setpassword(self, pwd):
+        """Set default password for encrypted files."""
+        self.pwd = pwd
+
+    @property
+    def comment(self):
+        """The comment text associated with the ZIP file."""
+        return self._comment
+
+    @comment.setter
+    def comment(self, comment):
+        # check for valid comment length
+        if len(comment) > ZIP_MAX_COMMENT:
+            import warnings
+            warnings.warn('Archive comment is too long; truncating to %d bytes'
+                          % ZIP_MAX_COMMENT, stacklevel=2)
+            comment = comment[:ZIP_MAX_COMMENT]
+        self._comment = comment
+        self._didModify = True
+
+    def read(self, name, pwd=None):
+        """Return file bytes (as a string) for name."""
+        return self.open(name, "r", pwd).read()
+
+    def open(self, name, mode="r", pwd=None):
+        """Return file-like object for 'name'."""
+        if mode not in ("r", "U", "rU"):
+            raise RuntimeError, 'open() requires mode "r", "U", or "rU"'
+        if not self.fp:
+            raise RuntimeError, \
+                  "Attempt to read ZIP archive that was already closed"
+
+        # Only open a new file for instances where we were not
+        # given a file object in the constructor
+        if self._filePassed:
+            zef_file = self.fp
+            should_close = False
+        else:
+            zef_file = open(self.filename, 'rb')
+            should_close = True
+
+        try:
+            # Make sure we have an info object
+            if isinstance(name, ZipInfo):
+                # 'name' is already an info object
+                zinfo = name
+            else:
+                # Get info object for name
+                zinfo = self.getinfo(name)
+
+            zef_file.seek(zinfo.header_offset, 0)
+
+            # Skip the file header:
+            fheader = zef_file.read(sizeFileHeader)
+            if len(fheader) != sizeFileHeader:
+                raise BadZipfile("Truncated file header")
+            fheader = struct.unpack(structFileHeader, fheader)
+            if fheader[_FH_SIGNATURE] != stringFileHeader:
+                raise BadZipfile("Bad magic number for file header")
+
+            fname = zef_file.read(fheader[_FH_FILENAME_LENGTH])
+            if fheader[_FH_EXTRA_FIELD_LENGTH]:
+                zef_file.read(fheader[_FH_EXTRA_FIELD_LENGTH])
+
+            if fname != zinfo.orig_filename:
+                raise BadZipfile, \
+                        'File name in directory "%s" and header "%s" differ.' % (
+                            zinfo.orig_filename, fname)
+
+            # check for encrypted flag & handle password
+            is_encrypted = zinfo.flag_bits & 0x1
+            zd = None
+            if is_encrypted:
+                if not pwd:
+                    pwd = self.pwd
+                if not pwd:
+                    raise RuntimeError, "File %s is encrypted, " \
+                        "password required for extraction" % name
+
+                zd = _ZipDecrypter(pwd)
+                # The first 12 bytes in the cypher stream is an encryption header
+                #  used to strengthen the algorithm. The first 11 bytes are
+                #  completely random, while the 12th contains the MSB of the CRC,
+                #  or the MSB of the file time depending on the header type
+                #  and is used to check the correctness of the password.
+                bytes = zef_file.read(12)
+                h = map(zd, bytes[0:12])
+                if zinfo.flag_bits & 0x8:
+                    # compare against the file type from extended local headers
+                    check_byte = (zinfo._raw_time >> 8) & 0xff
+                else:
+                    # compare against the CRC otherwise
+                    check_byte = (zinfo.CRC >> 24) & 0xff
+                if ord(h[11]) != check_byte:
+                    raise RuntimeError("Bad password for file", name)
+
+            return ZipExtFile(zef_file, mode, zinfo, zd,
+                    close_fileobj=should_close)
+        except:
+            if should_close:
+                zef_file.close()
+            raise
+
+    def extract(self, member, path=None, pwd=None):
+        """Extract a member from the archive to the current working directory,
+           using its full name. Its file information is extracted as accurately
+           as possible. `member' may be a filename or a ZipInfo object. You can
+           specify a different directory using `path'.
+        """
+        if not isinstance(member, ZipInfo):
+            member = self.getinfo(member)
+
+        if path is None:
+            path = os.getcwd()
+
+        return self._extract_member(member, path, pwd)
+
+    def extractall(self, path=None, members=None, pwd=None):
+        """Extract all members from the archive to the current working
+           directory. `path' specifies a different directory to extract to.
+           `members' is optional and must be a subset of the list returned
+           by namelist().
+        """
+        if members is None:
+            members = self.namelist()
+
+        for zipinfo in members:
+            self.extract(zipinfo, path, pwd)
+
+    def _extract_member(self, member, targetpath, pwd):
+        """Extract the ZipInfo object 'member' to a physical
+           file on the path targetpath.
+        """
+        # build the destination pathname, replacing
+        # forward slashes to platform specific separators.
+        arcname = member.filename.replace('/', os.path.sep)
+
+        if os.path.altsep:
+            arcname = arcname.replace(os.path.altsep, os.path.sep)
+        # interpret absolute pathname as relative, remove drive letter or
+        # UNC path, redundant separators, "." and ".." components.
+        arcname = os.path.splitdrive(arcname)[1]
+        arcname = os.path.sep.join(x for x in arcname.split(os.path.sep)
+                    if x not in ('', os.path.curdir, os.path.pardir))
+        if os.path.sep == '\\':
+            # filter illegal characters on Windows
+            illegal = ':<>|"?*'
+            if isinstance(arcname, unicode):
+                table = {ord(c): ord('_') for c in illegal}
+            else:
+                table = string.maketrans(illegal, '_' * len(illegal))
+            arcname = arcname.translate(table)
+            # remove trailing dots
+            arcname = (x.rstrip('.') for x in arcname.split(os.path.sep))
+            arcname = os.path.sep.join(x for x in arcname if x)
+
+        targetpath = os.path.join(targetpath, arcname)
+        targetpath = os.path.normpath(targetpath)
+
+        # Create all upper directories if necessary.
+        upperdirs = os.path.dirname(targetpath)
+        if upperdirs and not os.path.exists(upperdirs):
+            os.makedirs(upperdirs)
+
+        if member.filename[-1] == '/':
+            if not os.path.isdir(targetpath):
+                os.mkdir(targetpath)
+            return targetpath
+
+        with self.open(member, pwd=pwd) as source, \
+             file(targetpath, "wb") as target:
+            shutil.copyfileobj(source, target)
+
+        return targetpath
+
+    def _writecheck(self, zinfo):
+        """Check for errors before writing a file to the archive."""
+        if zinfo.filename in self.NameToInfo:
+            import warnings
+            warnings.warn('Duplicate name: %r' % zinfo.filename, stacklevel=3)
+        if self.mode not in ("w", "a"):
+            raise RuntimeError, 'write() requires mode "w" or "a"'
+        if not self.fp:
+            raise RuntimeError, \
+                  "Attempt to write ZIP archive that was already closed"
+        if zinfo.compress_type == ZIP_DEFLATED and not zlib:
+            raise RuntimeError, \
+                  "Compression requires the (missing) zlib module"
+        if zinfo.compress_type not in (ZIP_STORED, ZIP_DEFLATED):
+            raise RuntimeError, \
+                  "That compression method is not supported"
+        if not self._allowZip64:
+            requires_zip64 = None
+            if len(self.filelist) >= ZIP_FILECOUNT_LIMIT:
+                requires_zip64 = "Files count"
+            elif zinfo.file_size > ZIP64_LIMIT:
+                requires_zip64 = "Filesize"
+            elif zinfo.header_offset > ZIP64_LIMIT:
+                requires_zip64 = "Zipfile size"
+            if requires_zip64:
+                raise LargeZipFile(requires_zip64 +
+                                   " would require ZIP64 extensions")
+
+    def write(self, filename, arcname=None, compress_type=None):
+        """Put the bytes from filename into the archive under the name
+        arcname."""
+        if not self.fp:
+            raise RuntimeError(
+                  "Attempt to write to ZIP archive that was already closed")
+
+        st = os.stat(filename)
+        isdir = stat.S_ISDIR(st.st_mode)
+        mtime = time.localtime(st.st_mtime)
+        date_time = mtime[0:6]
+        # Create ZipInfo instance to store file information
+        if arcname is None:
+            arcname = filename
+        arcname = os.path.normpath(os.path.splitdrive(arcname)[1])
+        while arcname[0] in (os.sep, os.altsep):
+            arcname = arcname[1:]
+        if isdir:
+            arcname += '/'
+        zinfo = ZipInfo(arcname, date_time)
+        zinfo.external_attr = (st[0] & 0xFFFF) << 16L      # Unix attributes
+        if isdir:
+            zinfo.compress_type = ZIP_STORED
+        elif compress_type is None:
+            zinfo.compress_type = self.compression
+        else:
+            zinfo.compress_type = compress_type
+
+        zinfo.file_size = st.st_size
+        zinfo.flag_bits = 0x00
+        zinfo.header_offset = self.fp.tell()    # Start of header bytes
+
+        self._writecheck(zinfo)
+        self._didModify = True
+
+        if isdir:
+            zinfo.file_size = 0
+            zinfo.compress_size = 0
+            zinfo.CRC = 0
+            zinfo.external_attr |= 0x10  # MS-DOS directory flag
+            self.filelist.append(zinfo)
+            self.NameToInfo[zinfo.filename] = zinfo
+            self.fp.write(zinfo.FileHeader(False))
+            return
+
+        with open(filename, "rb") as fp:
+            # Must overwrite CRC and sizes with correct data later
+            zinfo.CRC = CRC = 0
+            zinfo.compress_size = compress_size = 0
+            # Compressed size can be larger than uncompressed size
+            zip64 = self._allowZip64 and \
+                    zinfo.file_size * 1.05 > ZIP64_LIMIT
+            self.fp.write(zinfo.FileHeader(zip64))
+            if zinfo.compress_type == ZIP_DEFLATED:
+                cmpr = zlib.compressobj(zlib.Z_DEFAULT_COMPRESSION,
+                     zlib.DEFLATED, -15)
+            else:
+                cmpr = None
+            file_size = 0
+            while 1:
+                buf = fp.read(1024 * 8)
+                if not buf:
+                    break
+                file_size = file_size + len(buf)
+                CRC = crc32(buf, CRC) & 0xffffffff
+                if cmpr:
+                    buf = cmpr.compress(buf)
+                    compress_size = compress_size + len(buf)
+                self.fp.write(buf)
+        if cmpr:
+            buf = cmpr.flush()
+            compress_size = compress_size + len(buf)
+            self.fp.write(buf)
+            zinfo.compress_size = compress_size
+        else:
+            zinfo.compress_size = file_size
+        zinfo.CRC = CRC
+        zinfo.file_size = file_size
+        if not zip64 and self._allowZip64:
+            if file_size > ZIP64_LIMIT:
+                raise RuntimeError('File size has increased during compressing')
+            if compress_size > ZIP64_LIMIT:
+                raise RuntimeError('Compressed size larger than uncompressed size')
+        # Seek backwards and write file header (which will now include
+        # correct CRC and file sizes)
+        position = self.fp.tell() # Preserve current position in file
+        self.fp.seek(zinfo.header_offset, 0)
+        self.fp.write(zinfo.FileHeader(zip64))
+        self.fp.seek(position, 0)
+        self.filelist.append(zinfo)
+        self.NameToInfo[zinfo.filename] = zinfo
+
+    def writestr(self, zinfo_or_arcname, bytes, compress_type=None):
+        """Write a file into the archive.  The contents is the string
+        'bytes'.  'zinfo_or_arcname' is either a ZipInfo instance or
+        the name of the file in the archive."""
+        if not isinstance(zinfo_or_arcname, ZipInfo):
+            zinfo = ZipInfo(filename=zinfo_or_arcname,
+                            date_time=time.localtime(time.time())[:6])
+
+            zinfo.compress_type = self.compression
+            if zinfo.filename[-1] == '/':
+                zinfo.external_attr = 0o40775 << 16   # drwxrwxr-x
+                zinfo.external_attr |= 0x10           # MS-DOS directory flag
+            else:
+                zinfo.external_attr = 0o600 << 16     # ?rw-------
+        else:
+            zinfo = zinfo_or_arcname
+
+        if not self.fp:
+            raise RuntimeError(
+                  "Attempt to write to ZIP archive that was already closed")
+
+        if compress_type is not None:
+            zinfo.compress_type = compress_type
+
+        zinfo.file_size = len(bytes)            # Uncompressed size
+        zinfo.header_offset = self.fp.tell()    # Start of header bytes
+        self._writecheck(zinfo)
+        self._didModify = True
+        zinfo.CRC = crc32(bytes) & 0xffffffff       # CRC-32 checksum
+        if zinfo.compress_type == ZIP_DEFLATED:
+            co = zlib.compressobj(zlib.Z_DEFAULT_COMPRESSION,
+                 zlib.DEFLATED, -15)
+            bytes = co.compress(bytes) + co.flush()
+            zinfo.compress_size = len(bytes)    # Compressed size
+        else:
+            zinfo.compress_size = zinfo.file_size
+        zip64 = zinfo.file_size > ZIP64_LIMIT or \
+                zinfo.compress_size > ZIP64_LIMIT
+        if zip64 and not self._allowZip64:
+            raise LargeZipFile("Filesize would require ZIP64 extensions")
+        self.fp.write(zinfo.FileHeader(zip64))
+        self.fp.write(bytes)
+        if zinfo.flag_bits & 0x08:
+            # Write CRC and file sizes after the file data
+            fmt = '<LQQ' if zip64 else '<LLL'
+            self.fp.write(struct.pack(fmt, zinfo.CRC, zinfo.compress_size,
+                  zinfo.file_size))
+        self.fp.flush()
+        self.filelist.append(zinfo)
+        self.NameToInfo[zinfo.filename] = zinfo
+
+    def __del__(self):
+        """Call the "close()" method in case the user forgot."""
+        self.close()
+
+    def close(self):
+        """Close the file, and for mode "w" and "a" write the ending
+        records."""
+        if self.fp is None:
+            return
+
+        try:
+            if self.mode in ("w", "a") and self._didModify: # write ending records
+                pos1 = self.fp.tell()
+                for zinfo in self.filelist:         # write central directory
+                    dt = zinfo.date_time
+                    dosdate = (dt[0] - 1980) << 9 | dt[1] << 5 | dt[2]
+                    dostime = dt[3] << 11 | dt[4] << 5 | (dt[5] // 2)
+                    extra = []
+                    if zinfo.file_size > ZIP64_LIMIT \
+                            or zinfo.compress_size > ZIP64_LIMIT:
+                        extra.append(zinfo.file_size)
+                        extra.append(zinfo.compress_size)
+                        file_size = 0xffffffff
+                        compress_size = 0xffffffff
+                    else:
+                        file_size = zinfo.file_size
+                        compress_size = zinfo.compress_size
+
+                    header_offset = zinfo.header_offset - self._start_disk
+                    if header_offset > ZIP64_LIMIT:
+                        extra.append(header_offset)
+                        header_offset = 0xffffffffL
+
+                    extra_data = zinfo.extra
+                    if extra:
+                        # Append a ZIP64 field to the extra's
+                        extra_data = struct.pack(
+                                '<HH' + 'Q'*len(extra),
+                                1, 8*len(extra), *extra) + extra_data
+
+                        extract_version = max(45, zinfo.extract_version)
+                        create_version = max(45, zinfo.create_version)
+                    else:
+                        extract_version = zinfo.extract_version
+                        create_version = zinfo.create_version
+
+                    try:
+                        filename, flag_bits = zinfo._encodeFilenameFlags()
+                        centdir = struct.pack(structCentralDir,
+                        stringCentralDir, create_version,
+                        zinfo.create_system, extract_version, zinfo.reserved,
+                        flag_bits, zinfo.compress_type, dostime, dosdate,
+                        zinfo.CRC, compress_size, file_size,
+                        len(filename), len(extra_data), len(zinfo.comment),
+                        0, zinfo.internal_attr, zinfo.external_attr,
+                        header_offset)
+                    except DeprecationWarning:
+                        print >>sys.stderr, (structCentralDir,
+                        stringCentralDir, create_version,
+                        zinfo.create_system, extract_version, zinfo.reserved,
+                        zinfo.flag_bits, zinfo.compress_type, dostime, dosdate,
+                        zinfo.CRC, compress_size, file_size,
+                        len(zinfo.filename), len(extra_data), len(zinfo.comment),
+                        0, zinfo.internal_attr, zinfo.external_attr,
+                        header_offset)
+                        raise
+                    self.fp.write(centdir)
+                    self.fp.write(filename)
+                    self.fp.write(extra_data)
+                    self.fp.write(zinfo.comment)
+
+                pos2 = self.fp.tell()
+                # Write end-of-zip-archive record
+                centDirCount = len(self.filelist)
+                centDirSize = pos2 - pos1
+                centDirOffset = pos1 - self._start_disk
+                requires_zip64 = None
+                if centDirCount > ZIP_FILECOUNT_LIMIT:
+                    requires_zip64 = "Files count"
+                elif centDirOffset > ZIP64_LIMIT:
+                    requires_zip64 = "Central directory offset"
+                elif centDirSize > ZIP64_LIMIT:
+                    requires_zip64 = "Central directory size"
+                if requires_zip64:
+                    # Need to write the ZIP64 end-of-archive records
+                    if not self._allowZip64:
+                        raise LargeZipFile(requires_zip64 +
+                                           " would require ZIP64 extensions")
+                    zip64endrec = struct.pack(
+                            structEndArchive64, stringEndArchive64,
+                            44, 45, 45, 0, 0, centDirCount, centDirCount,
+                            centDirSize, centDirOffset)
+                    self.fp.write(zip64endrec)
+
+                    zip64locrec = struct.pack(
+                            structEndArchive64Locator,
+                            stringEndArchive64Locator, 0, pos2, 1)
+                    self.fp.write(zip64locrec)
+                    centDirCount = min(centDirCount, 0xFFFF)
+                    centDirSize = min(centDirSize, 0xFFFFFFFF)
+                    centDirOffset = min(centDirOffset, 0xFFFFFFFF)
+
+                endrec = struct.pack(structEndArchive, stringEndArchive,
+                                    0, 0, centDirCount, centDirCount,
+                                    centDirSize, centDirOffset, len(self._comment))
+                self.fp.write(endrec)
+                self.fp.write(self._comment)
+                self.fp.flush()
+        finally:
+            fp = self.fp
+            self.fp = None
+            if not self._filePassed:
+                fp.close()
+
+
+class PyZipFile(ZipFile):
+    """Class to create ZIP archives with Python library files and packages."""
+
+    def writepy(self, pathname, basename = ""):
+        """Add all files from "pathname" to the ZIP archive.
+
+        If pathname is a package directory, search the directory and
+        all package subdirectories recursively for all *.py and enter
+        the modules into the archive.  If pathname is a plain
+        directory, listdir *.py and enter all modules.  Else, pathname
+        must be a Python *.py file and the module will be put into the
+        archive.  Added modules are always module.pyo or module.pyc.
+        This method will compile the module.py into module.pyc if
+        necessary.
+        """
+        dir, name = os.path.split(pathname)
+        if os.path.isdir(pathname):
+            initname = os.path.join(pathname, "__init__.py")
+            if os.path.isfile(initname):
+                # This is a package directory, add it
+                if basename:
+                    basename = "%s/%s" % (basename, name)
+                else:
+                    basename = name
+                if self.debug:
+                    print "Adding package in", pathname, "as", basename
+                fname, arcname = self._get_codename(initname[0:-3], basename)
+                if self.debug:
+                    print "Adding", arcname
+                self.write(fname, arcname)
+                dirlist = os.listdir(pathname)
+                dirlist.remove("__init__.py")
+                # Add all *.py files and package subdirectories
+                for filename in dirlist:
+                    path = os.path.join(pathname, filename)
+                    root, ext = os.path.splitext(filename)
+                    if os.path.isdir(path):
+                        if os.path.isfile(os.path.join(path, "__init__.py")):
+                            # This is a package directory, add it
+                            self.writepy(path, basename)  # Recursive call
+                    elif ext == ".py":
+                        fname, arcname = self._get_codename(path[0:-3],
+                                         basename)
+                        if self.debug:
+                            print "Adding", arcname
+                        self.write(fname, arcname)
+            else:
+                # This is NOT a package directory, add its files at top level
+                if self.debug:
+                    print "Adding files from directory", pathname
+                for filename in os.listdir(pathname):
+                    path = os.path.join(pathname, filename)
+                    root, ext = os.path.splitext(filename)
+                    if ext == ".py":
+                        fname, arcname = self._get_codename(path[0:-3],
+                                         basename)
+                        if self.debug:
+                            print "Adding", arcname
+                        self.write(fname, arcname)
+        else:
+            if pathname[-3:] != ".py":
+                raise RuntimeError, \
+                      'Files added with writepy() must end with ".py"'
+            fname, arcname = self._get_codename(pathname[0:-3], basename)
+            if self.debug:
+                print "Adding file", arcname
+            self.write(fname, arcname)
+
+    def _get_codename(self, pathname, basename):
+        """Return (filename, archivename) for the path.
+
+        Given a module name path, return the correct file path and
+        archive name, compiling if necessary.  For example, given
+        /python/lib/string, return (/python/lib/string.pyc, string).
+        """
+        file_py  = pathname + ".py"
+        file_pyc = pathname + ".pyc"
+        file_pyo = pathname + ".pyo"
+        if os.path.isfile(file_pyo) and \
+                            os.stat(file_pyo).st_mtime >= os.stat(file_py).st_mtime:
+            fname = file_pyo    # Use .pyo file
+        elif not os.path.isfile(file_pyc) or \
+             os.stat(file_pyc).st_mtime < os.stat(file_py).st_mtime:
+            import py_compile
+            if self.debug:
+                print "Compiling", file_py
+            try:
+                py_compile.compile(file_py, file_pyc, None, True)
+            except py_compile.PyCompileError,err:
+                print err.msg
+            fname = file_pyc
+        else:
+            fname = file_pyc
+        archivename = os.path.split(fname)[1]
+        if basename:
+            archivename = "%s/%s" % (basename, archivename)
+        return (fname, archivename)
+
+
+def main(args = None):
+    import textwrap
+    USAGE=textwrap.dedent("""\
+        Usage:
+            zipfile.py -l zipfile.zip        # Show listing of a zipfile
+            zipfile.py -t zipfile.zip        # Test if a zipfile is valid
+            zipfile.py -e zipfile.zip target # Extract zipfile into target dir
+            zipfile.py -c zipfile.zip src ... # Create zipfile from sources
+        """)
+    if args is None:
+        args = sys.argv[1:]
+
+    if not args or args[0] not in ('-l', '-c', '-e', '-t'):
+        print USAGE
+        sys.exit(1)
+
+    if args[0] == '-l':
+        if len(args) != 2:
+            print USAGE
+            sys.exit(1)
+        with ZipFile(args[1], 'r') as zf:
+            zf.printdir()
+
+    elif args[0] == '-t':
+        if len(args) != 2:
+            print USAGE
+            sys.exit(1)
+        with ZipFile(args[1], 'r') as zf:
+            badfile = zf.testzip()
+        if badfile:
+            print("The following enclosed file is corrupted: {!r}".format(badfile))
+        print "Done testing"
+
+    elif args[0] == '-e':
+        if len(args) != 3:
+            print USAGE
+            sys.exit(1)
+
+        with ZipFile(args[1], 'r') as zf:
+            zf.extractall(args[2])
+
+    elif args[0] == '-c':
+        if len(args) < 3:
+            print USAGE
+            sys.exit(1)
+
+        def addToZip(zf, path, zippath):
+            if os.path.isfile(path):
+                zf.write(path, zippath, ZIP_DEFLATED)
+            elif os.path.isdir(path):
+                if zippath:
+                    zf.write(path, zippath)
+                for nm in os.listdir(path):
+                    addToZip(zf,
+                            os.path.join(path, nm), os.path.join(zippath, nm))
+            # else: ignore
+
+        with ZipFile(args[1], 'w', allowZip64=True) as zf:
+            for path in args[2:]:
+                zippath = os.path.basename(path)
+                if not zippath:
+                    zippath = os.path.basename(os.path.dirname(path))
+                if zippath in ('', os.curdir, os.pardir):
+                    zippath = ''
+                addToZip(zf, path, zippath)
+
+if __name__ == "__main__":
+    main()
diff --git a/tracing/BUILD.gn b/tracing/BUILD.gn
index 3eddc7c..889d30b 100644
--- a/tracing/BUILD.gn
+++ b/tracing/BUILD.gn
@@ -2,16 +2,15 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-import("//build/config/python.gni")
 import("trace_viewer.gni")
 
 # TODO: ideally this would go into the target_gen_dir, but this requires some
 # changes to the scripts that process them.
 output_resource_dir = "$root_gen_dir/content/browser/tracing"
 
-# TODO(crbug.com/1112471) - Get this to run cleanly under Python3.
-python2_action("generate_about_tracing") {
+action("generate_about_tracing") {
   script = "bin/generate_about_tracing_contents"
+
   inputs = tracing_files + tracing_python_files
   outputs = [
     "$output_resource_dir/about_tracing.js",