text: ZLIB DATA COMPRESSION LIBRARY
  
  zlib 1.2.11 is a general purpose data compression library.  All the code is
  thread safe.  The data format used by the zlib library is described by RFCs
  (Request for Comments) 1950 to 1952 in the files
  http://tools.ietf.org/html/rfc1950 (zlib format), rfc1951 (deflate format) and
  rfc1952 (gzip format).
  
  All functions of the compression library are documented in the file zlib.h
  (volunteer to write man pages welcome, contact zlib@gzip.org).  A usage example
  of the library is given in the file test/example.c which also tests that
  the library is working correctly.  Another example is given in the file
  test/minigzip.c.  The compression library itself is composed of all source
  files in the root directory.
  
  To compile all files and run the test program, follow the instructions given at
  the top of Makefile.in.  In short "./configure; make test", and if that goes
  well, "make install" should work for most flavors of Unix.  For Windows, use
  one of the special makefiles in win32/ or contrib/vstudio/ .  For VMS, use
  make_vms.com.
  
  Questions about zlib should be sent to <zlib@gzip.org>, or to Gilles Vollant
  <info@winimage.com> for the Windows DLL version.  The zlib home page is
  http://zlib.net/ .  Before reporting a problem, please check this site to
  verify that you have the latest version of zlib; otherwise get the latest
  version and check whether the problem still exists or not.
  
  PLEASE read the zlib FAQ http://zlib.net/zlib_faq.html before asking for help.
  
  Mark Nelson <markn@ieee.org> wrote an article about zlib for the Jan.  1997
  issue of Dr.  Dobb's Journal; a copy of the article is available at
  http://marknelson.us/1997/01/01/zlib-engine/ .
  
  The changes made in version 1.2.11 are documented in the file ChangeLog.
  
  Unsupported third party contributions are provided in directory contrib/ .
  
  zlib is available in Java using the java.util.zip package, documented at
  http://java.sun.com/developer/technicalArticles/Programming/compression/ .
  
  A Perl interface to zlib written by Paul Marquess <pmqs@cpan.org> is available
  at CPAN (Comprehensive Perl Archive Network) sites, including
  http://search.cpan.org/~pmqs/IO-Compress-Zlib/ .
  
  A Python interface to zlib written by A.M. Kuchling <amk@amk.ca> is
  available in Python 1.5 and later versions, see
  http://docs.python.org/library/zlib.html .
  
  zlib is built into tcl: http://wiki.tcl.tk/4610 .
  
  An experimental package to read and write files in .zip format, written on top
  of zlib by Gilles Vollant <info@winimage.com>, is available in the
  contrib/minizip directory of zlib.
  
  
  Notes for some targets:
  
  - For Windows DLL versions, please see win32/DLL_FAQ.txt
  
  - For 64-bit Irix, deflate.c must be compiled without any optimization. With
    -O, one libpng test fails. The test works in 32 bit mode (with the -n32
    compiler flag). The compiler bug has been reported to SGI.
  
  - zlib doesn't work with gcc 2.6.3 on a DEC 3000/300LX under OSF/1 2.1 it works
    when compiled with cc.
  
  - On Digital Unix 4.0D (formely OSF/1) on AlphaServer, the cc option -std1 is
    necessary to get gzprintf working correctly. This is done by configure.
  
  - zlib doesn't work on HP-UX 9.05 with some versions of /bin/cc. It works with
    other compilers. Use "make test" to check your compiler.
  
  - gzdopen is not supported on RISCOS or BEOS.
  
  - For PalmOs, see http://palmzlib.sourceforge.net/
  
  
  Acknowledgments:
  
    The deflate format used by zlib was defined by Phil Katz.  The deflate and
    zlib specifications were written by L.  Peter Deutsch.  Thanks to all the
    people who reported problems and suggested various improvements in zlib; they
    are too numerous to cite here.
  
  Copyright notice:
  
   (C) 1995-2017 Jean-loup Gailly and Mark Adler
  
    This software is provided 'as-is', without any express or implied
    warranty.  In no event will the authors be held liable for any damages
    arising from the use of this software.
  
    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute it
    freely, subject to the following restrictions:
  
    1. The origin of this software must not be misrepresented; you must not
       claim that you wrote the original software. If you use this software
       in a product, an acknowledgment in the product documentation would be
       appreciated but is not required.
    2. Altered source versions must be plainly marked as such, and must not be
       misrepresented as being the original software.
    3. This notice may not be removed or altered from any source distribution.
  
    Jean-loup Gailly        Mark Adler
    jloup@gzip.org          madler@alumni.caltech.edu
  
  If you use the zlib library in a product, we would appreciate *not* receiving
  lengthy legal documents to sign.  The sources are provided for free but without
  warranty of any kind.  The library has been entirely written by Jean-loup
  Gailly and Mark Adler; it does not include third-party code.
  
  If you redistribute modified sources, we would appreciate that you include in
  the file ChangeLog history information documenting your changes.  Please read
  the FAQ for more information on the distribution of modified source versions.
  