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ZLIB Compressed Data Format Specification version 3.3 (RFC1950)

IP.com Disclosure Number: IPCOM000004248D
Original Publication Date: 1996-May-01
Included in the Prior Art Database: 2001-Nov-12
Document File: 12 page(s) / 21K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

P. Deutsch: AUTHOR [+2]

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. (Download file contains alternative document formats.)

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 17% of the total text.

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]

RFC 1950       ZLIB Compressed Data Format Specification        May 1996

Table of Contents

   1. Introduction ................................................... 2

      1.1. Purpose ................................................... 2

      1.2. Intended audience ......................................... 3

      1.3. Scope ..................................................... 3

      1.4. Compliance ................................................ 3

      1.5.  Definitions of terms and conventions used ................ 3

      1.6. Changes from previous versions ............................ 3

   2. Detailed specification ......................................... 3

      2.1. Overall conventions ....................................... 3

      2.2. Data format ............................................... 4

      2.3. Compliance ................................................ 7

   3. References ..................................................... 7

   4. Source code .................................................... 8

   5. Security Considerations ........................................ 8

   6. Acknowledgements ............................................... 8

   7. Authors' Addresses ............................................. 8

   8. Appendix: Rationale ............................................ 9

   9. Appendix: Sample code ................