Original patch by Jim Jewett; see issue 14684.

Original patch by Sam Rushing.

While we're at it, also document ZLIB_VERSION.

Patch by Torsten Landschoff.

If the version of zlib used to compile the zlib module is incompatible
with the one that is actually linked in, then calls into zlib will fail.
This can leave attributes of the z_stream uninitialized, so we must take
care to avoid segfaulting by trying to use an invalid pointer.

Fix by Richard M. Tew.

If the version of zlib used to compile the zlib module is incompatible
with the one that is actually linked in, then calls into zlib will fail.
This can leave attributes of the z_stream uninitialized, so we must take
care to avoid segfaulting by trying to use an invalid pointer.

Fix by Richard M. Tew.

Reported by Oleg Oshmyan in issue #12646.

This will make it easier to detect truncated input streams.

Also, make zlib's error messages more consistent.

Raise an OverflowError if the input data is too large, instead of silently
truncating the input and returning an incorrect result.

Also, make sure that test_zlib tests decompress() for overly-large inputs.

attribute when called without a max_length argument.

svn+ssh://pythondev@svn.python.org/python/branches/py3k

........
  r88460 | antoine.pitrou | 2011-02-21 19:03:13 +0100 (lun., 21 févr. 2011) | 4 lines

  Issue #10276: Fix the results of zlib.crc32() and zlib.adler32() on buffers
  larger than 4GB.  Patch by Nadeem Vawda.
........
  r88464 | antoine.pitrou | 2011-02-21 20:05:08 +0100 (lun., 21 févr. 2011) | 3 lines

  Fix issues on 32-bit systems introduced by r88460
........
  r88466 | antoine.pitrou | 2011-02-21 20:28:40 +0100 (lun., 21 févr. 2011) | 3 lines

  Fix compile error under MSVC introduced by r88460.
........
  r88486 | antoine.pitrou | 2011-02-22 00:41:12 +0100 (mar., 22 févr. 2011) | 5 lines

  Issue #4681: Allow mmap() to work on file sizes and offsets larger than
  4GB, even on 32-bit builds.  Initial patch by Ross Lagerwall, adapted for
  32-bit Windows.
........
  r88511 | antoine.pitrou | 2011-02-22 22:42:56 +0100 (mar., 22 févr. 2011) | 4 lines

  Issue #11277: finally fix Snow Leopard crash following r88460.
  (probably an OS-related issue with mmap)
........
  r88652 | antoine.pitrou | 2011-02-26 16:58:05 +0100 (sam., 26 févr. 2011) | 4 lines

  Issue #9931: Fix hangs in GUI tests under Windows in certain conditions.
  Patch by Hirokazu Yamamoto.
........

svn+ssh://pythondev@svn.python.org/python/branches/py3k

........
  r88464 | antoine.pitrou | 2011-02-21 20:05:08 +0100 (lun., 21 févr. 2011) | 3 lines

  Fix issues on 32-bit systems introduced by r88460
........
  r88466 | antoine.pitrou | 2011-02-21 20:28:40 +0100 (lun., 21 févr. 2011) | 3 lines

  Fix compile error under MSVC introduced by r88460.
........

svn+ssh://pythondev@svn.python.org/python/branches/py3k

........
  r88460 | antoine.pitrou | 2011-02-21 19:03:13 +0100 (lun., 21 févr. 2011) | 4 lines

  Issue #10276: Fix the results of zlib.crc32() and zlib.adler32() on buffers
  larger than 4GB.  Patch by Nadeem Vawda.
........

larger than 4GB.  Patch by Nadeem Vawda.

the input buffer length doesn't fit into an unsigned int (length bigger than
2^32-1 bytes).

svn+ssh://pythondev@svn.python.org/python/branches/py3k

................
  r81100 | antoine.pitrou | 2010-05-12 01:46:02 +0200 (mer., 12 mai 2010) | 10 lines

  Merged revisions 81098 via svnmerge from
  svn+ssh://pythondev@svn.python.org/python/trunk

  ........
    r81098 | antoine.pitrou | 2010-05-12 01:42:28 +0200 (mer., 12 mai 2010) | 5 lines

    Issue #8681: Make the zlib module's error messages more informative when
    the zlib itself doesn't give any detailed explanation.
  ........
................

svn+ssh://pythondev@svn.python.org/python/trunk

........
  r81098 | antoine.pitrou | 2010-05-12 01:42:28 +0200 (mer., 12 mai 2010) | 5 lines

  Issue #8681: Make the zlib module's error messages more informative when
  the zlib itself doesn't give any detailed explanation.
........

svn+ssh://pythondev@svn.python.org/python/branches/py3k

................
  r81032 | antoine.pitrou | 2010-05-09 17:52:27 +0200 (dim., 09 mai 2010) | 9 lines

  Recorded merge of revisions 81029 via svnmerge from
  svn+ssh://pythondev@svn.python.org/python/trunk

  ........
    r81029 | antoine.pitrou | 2010-05-09 16:46:46 +0200 (dim., 09 mai 2010) | 3 lines

    Untabify C files. Will watch buildbots.
  ........
................

svn+ssh://pythondev@svn.python.org/python/trunk

........
  r81029 | antoine.pitrou | 2010-05-09 16:46:46 +0200 (dim., 09 mai 2010) | 3 lines

  Untabify C files. Will watch buildbots.
........

svn+ssh://pythondev@svn.python.org/python/branches/py3k

................
  r80928 | antoine.pitrou | 2010-05-07 19:04:02 +0200 (ven., 07 mai 2010) | 11 lines

  Merged revisions 80926 via svnmerge from
  svn+ssh://pythondev@svn.python.org/python/trunk

  ........
    r80926 | antoine.pitrou | 2010-05-07 18:50:34 +0200 (ven., 07 mai 2010) | 5 lines

    Issue #8571: Fix an internal error when compressing or decompressing a
    chunk larger than 1GB with the zlib module's compressor and decompressor
    objects.
  ........
................

svn+ssh://pythondev@svn.python.org/python/trunk

........
  r80926 | antoine.pitrou | 2010-05-07 18:50:34 +0200 (ven., 07 mai 2010) | 5 lines

  Issue #8571: Fix an internal error when compressing or decompressing a
  chunk larger than 1GB with the zlib module's compressor and decompressor
  objects.
........

svn+ssh://pythondev@svn.python.org/python/branches/py3k

........
  r76836 | antoine.pitrou | 2009-12-14 19:00:06 +0100 (lun., 14 déc. 2009) | 5 lines

  Issue #4757: `zlib.compress` and other methods in the zlib module now
  raise a TypeError when given an `str` object (rather than a `bytes`-like
  object).  Patch by Victor Stinner and Florent Xicluna.
........

raise a TypeError when given an `str` object (rather than a `bytes`-like
object).  Patch by Victor Stinner and Florent Xicluna.

type of tp_compare in a separate commit, for ease of reversion
should things go wrong.

Make zlib and zipimport to return bytes instead of bytearray and use bytes
rather than bytearray for their internal leftover data storages.

svn+ssh://pythondev@svn.python.org/python/trunk

........
  r65654 | martin.v.loewis | 2008-08-12 16:49:50 +0200 (Tue, 12 Aug 2008) | 6 lines

  Issue #3139: Make buffer-interface thread-safe wrt. PyArg_ParseTuple,
  by denying s# to parse objects that have a releasebuffer procedure,
  and introducing s*.

  More module might need to get converted to use s*.
........

Otherwise dir(_sre.SRE_Match) returns an empty list.

First step: handle most occurrences, remove tp_getattr and fill the tp_methods and tp_members slots.
Add some test about attribute access.

Merged revisions 62194,62197-62198,62204-62205,62214,62219-62221,62227,62229-62231,62233-62235,62237-62239 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

........
  r62194 | jeffrey.yasskin | 2008-04-07 01:04:28 +0200 (Mon, 07 Apr 2008) | 7 lines

  Add enough debugging information to diagnose failures where the
  HandlerBException is ignored, and fix one such problem, where it was thrown
  during the __del__ method of the previous Popen object.

  We may want to find a better way of printing verbose information so it's not
  spammy when the test passes.
........
  r62197 | mark.hammond | 2008-04-07 03:53:39 +0200 (Mon, 07 Apr 2008) | 2 lines

  Issue #2513: enable 64bit cross compilation on windows.
........
  r62198 | mark.hammond | 2008-04-07 03:59:40 +0200 (Mon, 07 Apr 2008) | 2 lines

  correct heading underline for new "Cross-compiling on Windows" section
........
  r62204 | gregory.p.smith | 2008-04-07 08:33:21 +0200 (Mon, 07 Apr 2008) | 4 lines

  Use the new PyFile_IncUseCount & PyFile_DecUseCount calls appropriatly
  within the standard library.  These modules use PyFile_AsFile and later
  release the GIL while operating on the previously returned FILE*.
........
  r62205 | mark.summerfield | 2008-04-07 09:39:23 +0200 (Mon, 07 Apr 2008) | 4 lines

  changed "2500 components" to "several thousand" since the number keeps
  growning:-)
........
  r62214 | georg.brandl | 2008-04-07 20:51:59 +0200 (Mon, 07 Apr 2008) | 2 lines

  #2525: update timezone info examples in the docs.
........
  r62219 | andrew.kuchling | 2008-04-08 01:57:07 +0200 (Tue, 08 Apr 2008) | 1 line

  Write PEP 3127 section; add items
........
  r62220 | andrew.kuchling | 2008-04-08 01:57:21 +0200 (Tue, 08 Apr 2008) | 1 line

  Typo fix
........
  r62221 | andrew.kuchling | 2008-04-08 03:33:10 +0200 (Tue, 08 Apr 2008) | 1 line

  Typographical fix: 32bit -> 32-bit, 64bit -> 64-bit
........
  r62227 | andrew.kuchling | 2008-04-08 23:22:53 +0200 (Tue, 08 Apr 2008) | 1 line

  Add items
........
  r62229 | amaury.forgeotdarc | 2008-04-08 23:27:42 +0200 (Tue, 08 Apr 2008) | 7 lines

  Issue2564: Prevent a hang in "import test.autotest", which runs the entire test
  suite as a side-effect of importing the module.

  - in test_capi, a thread tried to import other modules
  - re.compile() imported sre_parse again on every call.
........
  r62230 | amaury.forgeotdarc | 2008-04-08 23:51:57 +0200 (Tue, 08 Apr 2008) | 2 lines

  Prevent an error when inspect.isabstract() is called with something else than a new-style class.
........
  r62231 | amaury.forgeotdarc | 2008-04-09 00:07:05 +0200 (Wed, 09 Apr 2008) | 8 lines

  Issue 2408: remove the _types module
  It was only used as a helper in types.py to access types (GetSetDescriptorType and MemberDescriptorType),
  when they can easily be obtained with python code.
  These expressions even work with Jython.

  I don't know what the future of the types module is; (cf. discussion in http://bugs.python.org/issue1605 )
  at least this change makes it simpler.
........
  r62233 | amaury.forgeotdarc | 2008-04-09 01:10:07 +0200 (Wed, 09 Apr 2008) | 2 lines

  Add a NEWS entry for previous checkin
........
  r62234 | trent.nelson | 2008-04-09 01:47:30 +0200 (Wed, 09 Apr 2008) | 37 lines

  - Issue #2550: The approach used by client/server code for obtaining ports
    to listen on in network-oriented tests has been refined in an effort to
    facilitate running multiple instances of the entire regression test suite
    in parallel without issue.  test_support.bind_port() has been fixed such
    that it will always return a unique port -- which wasn't always the case
    with the previous implementation, especially if socket options had been
    set that affected address reuse (i.e. SO_REUSEADDR, SO_REUSEPORT).  The
    new implementation of bind_port() will actually raise an exception if it
    is passed an AF_INET/SOCK_STREAM socket with either the SO_REUSEADDR or
    SO_REUSEPORT socket option set.  Furthermore, if available, bind_port()
    will set the SO_EXCLUSIVEADDRUSE option on the socket it's been passed.
    This currently only applies to Windows.  This option prevents any other
    sockets from binding to the host/port we've bound to, thus removing the
    possibility of the 'non-deterministic' behaviour, as Microsoft puts it,
    that occurs when a second SOCK_STREAM socket binds and accepts to a
    host/port that's already been bound by another socket.  The optional
    preferred port parameter to bind_port() has been removed.  Under no
    circumstances should tests be hard coding ports!

    test_support.find_unused_port() has also been introduced, which will pass
    a temporary socket object to bind_port() in order to obtain an unused port.
    The temporary socket object is then closed and deleted, and the port is
    returned.  This method should only be used for obtaining an unused port
    in order to pass to an external program (i.e. the -accept [port] argument
    to openssl's s_server mode) or as a parameter to a server-oriented class
    that doesn't give you direct access to the underlying socket used.

    Finally, test_support.HOST has been introduced, which should be used for
    the host argument of any relevant socket calls (i.e. bind and connect).

    The following tests were updated to following the new conventions:
      test_socket, test_smtplib, test_asyncore, test_ssl, test_httplib,
      test_poplib, test_ftplib, test_telnetlib, test_socketserver,
      test_asynchat and test_socket_ssl.

    It is now possible for multiple instances of the regression test suite to
    run in parallel without issue.
........
  r62235 | gregory.p.smith | 2008-04-09 02:25:17 +0200 (Wed, 09 Apr 2008) | 3 lines

  Fix zlib crash from zlib.decompressobj().flush(val) when val was not positive.
  It tried to allocate negative or zero memory.  That fails.
........
  r62237 | trent.nelson | 2008-04-09 02:34:53 +0200 (Wed, 09 Apr 2008) | 1 line

  Fix typo with regards to self.PORT shadowing class variables with the same name.
........
  r62238 | andrew.kuchling | 2008-04-09 03:08:32 +0200 (Wed, 09 Apr 2008) | 1 line

  Add items
........
  r62239 | jerry.seutter | 2008-04-09 07:07:58 +0200 (Wed, 09 Apr 2008) | 1 line

  Changed test so it no longer runs as a side effect of importing.
........

Merged revisions 61834,61841-61842,61851-61853,61863-61864,61869-61870,61874,61889 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

........
  r61834 | raymond.hettinger | 2008-03-24 07:07:49 +0100 (Mon, 24 Mar 2008) | 1 line

  Tighten documentation for Random.triangular.
........
  r61841 | raymond.hettinger | 2008-03-24 09:17:39 +0100 (Mon, 24 Mar 2008) | 1 line

  Issue 2460: Make Ellipsis objects copyable.
........
  r61842 | georg.brandl | 2008-03-24 10:34:34 +0100 (Mon, 24 Mar 2008) | 2 lines

  #1700821: add a note to audioop docs about signedness of sample formats.
........
  r61851 | christian.heimes | 2008-03-24 20:57:42 +0100 (Mon, 24 Mar 2008) | 1 line

  Added quick hack for bzr
........
  r61852 | christian.heimes | 2008-03-24 20:58:17 +0100 (Mon, 24 Mar 2008) | 1 line

  Added quick hack for bzr
........
  r61853 | amaury.forgeotdarc | 2008-03-24 22:04:10 +0100 (Mon, 24 Mar 2008) | 4 lines

  Issue2469: Correct a typo I introduced at r61793: compilation error with UCS4 builds.

  All buildbots compile with UCS2...
........
  r61863 | neal.norwitz | 2008-03-25 05:17:38 +0100 (Tue, 25 Mar 2008) | 2 lines

  Fix a bunch of UnboundLocalErrors when the tests fail.
........
  r61864 | neal.norwitz | 2008-03-25 05:18:18 +0100 (Tue, 25 Mar 2008) | 2 lines

  Try to fix a bunch of compiler warnings on Win64.
........
  r61869 | neal.norwitz | 2008-03-25 07:35:10 +0100 (Tue, 25 Mar 2008) | 3 lines

  Don't try to close a non-open file.
  Don't let file removal cause the test to fail.
........
  r61870 | neal.norwitz | 2008-03-25 08:00:39 +0100 (Tue, 25 Mar 2008) | 7 lines

  Try to get this test to be more stable:
   * disable gc during the test run because we are spawning objects and there
     was an exception when calling Popen.__del__
   * Always set an alarm handler so the process doesn't exit if the test fails
     (should probably add assertions on the value of hndl_called in more places)
   * Using a negative time causes Linux to treat it as zero, so disable that test.
........
  r61874 | gregory.p.smith | 2008-03-25 08:31:28 +0100 (Tue, 25 Mar 2008) | 2 lines

  Use a 32-bit unsigned int here, a long is not needed.
........
  r61889 | georg.brandl | 2008-03-25 12:59:51 +0100 (Tue, 25 Mar 2008) | 2 lines

  Move declarations to block start.
........

svn+ssh://pythondev@svn.python.org/python/trunk

........
  r61820 | gregory.p.smith | 2008-03-23 23:14:38 +0100 (Sun, 23 Mar 2008) | 2 lines

  replace calls to get the initial values with the raw constants.
........
  r61821 | gregory.p.smith | 2008-03-24 00:43:02 +0100 (Mon, 24 Mar 2008) | 2 lines

  A bugfix for r61813, it would fail if the data size was >=2**32.
........
  r61822 | gregory.p.smith | 2008-03-24 00:45:12 +0100 (Mon, 24 Mar 2008) | 2 lines

  prevent a warning from the struct module when data size >= 2**32.
........
  r61823 | gregory.p.smith | 2008-03-24 01:08:01 +0100 (Mon, 24 Mar 2008) | 4 lines

  Have the binascii module use zlib's optimized crc32() function when available
  to reduce our code size (1k data table and tiny bit of code).  It falls back
  to its own without zlib.
........

the proper fix.

Create a signed CRC32 hash. I'm not absolutely sure it's correct. At least it fixes the unit tests and doesn't create a different hash than Python 2.x

would expect.

Fixes issues1202.