ZLIB(3)                   (15 Jan 2017)                   ZLIB(3)

          zlib - compression/decompression library

          [see zlib.h for full description]

          The zlib library is a general purpose data compression
          library.  The code is thread safe, assuming that the stan-
          dard library functions used are thread safe, such as memory
          allocation routines.  It provides in-memory compression and
          decompression functions, including integrity checks of the
          uncompressed data.  This version of the library supports
          only one compression method (deflation) but other algorithms
          may be added later with the same stream interface.

          Compression can be done in a single step if the buffers are
          large enough or can be done by repeated calls of the com-
          pression function.  In the latter case, the application must
          provide more input and/or consume the output (providing more
          output space) before each call.

          The library also supports reading and writing files in
          gzip(1) (.gz) format with an interface similar to that of

          The library does not install any signal handler.  The
          decoder checks the consistency of the compressed data, so
          the library should never crash even in the case of corrupted

          All functions of the compression library are documented in
          the file zlib.h. The distribution source includes examples
          of use of the library in the files test/example.c and
          test/minigzip.c, as well as other examples in the examples/

          Changes to this version are documented in the file ChangeLog
          that accompanies the source.

          zlib is built in to many languages and operating systems,
          including but not limited to Java, Python, .NET, PHP, Perl,
          Ruby, Swift, and Go.

          An experimental package to read and write files in the .zip
          format, written on top of zlib by Gilles Vollant
          (info@winimage.com), is available at:

               http://www.winimage.com/zLibDll/minizip.html and also
               in the contrib/minizip directory of the main zlib

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               source distribution.

          The zlib web site can be found at:


          The data format used by the zlib library is described by RFC
          (Request for Comments) 1950 to 1952 in the files:

               http://tools.ietf.org/html/rfc1950 (for the zlib header
               and trailer format)
               http://tools.ietf.org/html/rfc1951 (for the deflate
               compressed data format)
               http://tools.ietf.org/html/rfc1952 (for the gzip header
               and trailer format)

          Mark Nelson wrote an article about zlib for the Jan. 1997
          issue of  Dr. Dobb's Journal; a copy of the article is
          available at:


          Before reporting a problem, please check the zlib web site
          to verify that you have the latest version of zlib; other-
          wise, obtain the latest version and see if the problem still
          exists.  Please read the zlib FAQ at:


          before asking for help.  Send questions and/or comments to
          zlib@gzip.org, or (for the Windows DLL version) to Gilles
          Vollant (info@winimage.com).

          Version 1.2.11

          Copyright (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 soft-

          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

             The origin of this software must not be misrepresented;

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             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.

             Altered source versions must be plainly marked as such,
             and must not be misrepresented as being the original

             This notice may not be removed or altered from any source

          Jean-loup Gailly        Mark Adler
          jloup@gzip.org          madler@alumni.caltech.edu

          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; who are too numerous
          to cite here.

          UNIX manual page by R. P. C. Rodgers, U.S. National Library
          of Medicine (rodgers@nlm.nih.gov).

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