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Network Working Group                                         P. Deutsch
Request for Comments: 1950                           Aladdin Enterprises
Category: Informational                                      J-L. Gailly
                                                                Info-ZIP
                                                                May 1996


         ZLIB Compressed Data Format Specification version 3.3

Status of This Memo

   This memo provides information for the Internet community.  This memo
   does not specify an Internet standard of any kind.  Distribution of
   this memo is unlimited.

IESG Note:

   The IESG takes no position on the validity of any Intellectual
   Property Rights statements contained in this document.

Notices

   Copyright (c) 1996 L. Peter Deutsch and Jean-Loup Gailly

   Permission is granted to copy and distribute this document for any
   purpose and without charge, including translations into other
   languages and incorporation into compilations, provided that the
   copyright notice and this notice are preserved, and that any
   substantive changes or deletions from the original are clearly
   marked.

   A pointer to the latest version of this and related documentation in
   HTML format can be found at the URL
   <ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html>.

Abstract

   This specification defines a lossless compressed data format.  The
   data can be produced or consumed, even for an arbitrarily long
   sequentially presented input data stream, using only an a priori
   bounded amount of intermediate storage.  The format presently uses
   the DEFLATE compression method but can be easily extended to use
   other compression methods.  It can be implemented readily in a manner
   not covered by patents.  This specification also defines the ADLER-32
   checksum (an extension and improvement of the Fletcher checksum),
   used for detection of data corruption, and provides an algorithm for
   computing it.




Deutsch & Gailly             Informational                      [Page 1]

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Awgiedawgie 440215 points

                                     
RFC 1950       ZLIB Compressed Data Format Specification        May 1996


4. Source code

   Source code for a C language implementation of a &quot;zlib&quot; compliant
   library is available at ftp://ftp.uu.net/pub/archiving/zip/zlib/.

5. Security Considerations

   A decoder that fails to check the ADLER32 checksum value may be
   subject to undetected data corruption.

6. Acknowledgements

   Trademarks cited in this document are the property of their
   respective owners.

   Jean-Loup Gailly and Mark Adler designed the zlib format and wrote
   the related software described in this specification.  Glenn
   Randers-Pehrson converted this document to RFC and HTML format.

7. Authors' Addresses

   L. Peter Deutsch
   Aladdin Enterprises
   203 Santa Margarita Ave.
   Menlo Park, CA 94025

   Phone: (415) 322-0103 (AM only)
   FAX:   (415) 322-1734
   EMail: &lt;[email protected]&gt;


   Jean-Loup Gailly

   EMail: &lt;[email protected]&gt;

   Questions about the technical content of this specification can be
   sent by email to

   Jean-Loup Gailly &lt;[email protected]&gt; and
   Mark Adler &lt;[email protected]&gt;

   Editorial comments on this specification can be sent by email to

   L. Peter Deutsch &lt;[email protected]&gt; and
   Glenn Randers-Pehrson &lt;[email protected]&gt;






Deutsch &amp; Gailly             Informational                      [Page 8]

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