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GZIP file format specification version 4.3 (RFC1952)

IP.com Disclosure Number: IPCOM000004180D
Original Publication Date: 1996-May-01
Included in the Prior Art Database: 2019-Feb-12
Document File: 12 page(s) / 16K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

P. Deutsch: AUTHOR

Related Documents

10.17487/RFC1952: DOI

Abstract

This specification defines a lossless compressed data format that is compatible with the widely used GZIP utility. This memo provides information for the Internet community. This memo does not specify an Internet standard of any kind.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 14% of the total text.

Network Working Group P. Deutsch Request for Comments: 1952 Aladdin Enterprises Category: Informational May 1996

GZIP file format specification version 4.3

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

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 that is compatible with the widely used GZIP utility. The format includes a cyclic redundancy check value for detecting data corruption. The format presently uses the DEFLATE method of compression but can be easily extended to use other compression methods. The format can be implemented readily in a manner not covered by patents.

Deutsch Informational [Page 1]

RFC 1952 GZIP File 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 ......................................... 4 2.1. Overall conventions ....................................... 4 2.2. File format ............................................... 5 2.3. Member format ............................................. 5 2.3.1. Member header and trailer ........................... 6 2.3.1.1. Extra field ................................... 8 2.3.1.2. Compliance .................................... 9 3. References .................................................. 9 4. Security Considerations .................................... 10 5. Acknowledgements ........................................... 10 6. Author’s Address ........................................... 10 7. Appendix: Jean-Loup Gailly’s gzip utility .................. 11 8. Appendix: Sample CRC Code .................................. 11

1. Introduction

1.1. Purpose

The purpose of this specification is to define a lossless compressed data format that:

* Is independent of CPU type, operating system, fi...

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