The application/zlib and application/gzip media types
draft-levine-application-gzip-01

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Document Type Active Internet-Draft (individual in app area)
Last updated 2012-03-06
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Network Working Group                                        J.R. Levine
Internet-Draft                                      Taughannock Networks
Intended status: Informational                                March 2012
Expires: September 12, 2012

         The application/zlib and application/gzip media types
                    draft-levine-application-gzip-01

Abstract

   This document defines the 'application/gzip' and 'application/zlib'
   media types for compressed data using the gzip and zlib compression
   formats.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   This Internet-Draft will expire on September 12, 2012.

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   Copyright (c) 2012 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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1.  Introduction

   The Zlib [RFC1950] and gzip [RFC1952] formats are widely used
   compression formats.  Zlib is a stream format, while glib adds header
   and trailer fields more appropriate for a file format.  Both

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   implement the DEFLATE compression scheme described in [RFC1951].

   They are used to compress a wide variety of material, from
   unstructured text to structured data to executable code.

   Some applications have informally used the media type application/
   x-gzip.  The media types defined in this document should replace that
   media type in future applications.

2.  The Application/Zlib Media Type

   The application/zlib media type describes a block of data that is
   compressed using Zlib [RFC1950] compression.  The data is a stream of
   bytes as described in RFC 1950.

2.1.  Regsistration Details

   Type name: application

   Subtype name: zlib

   Required parameters: N/A

   Optional parameters: N/A

   Encoding considerations: needs base64 or other encoding that allows
   arbitrary binary data

   Security considerations: See section [security] below

   Interoperability considerations: N/A

   Published specification: [RFC1950]

   Applications that use this media type: anywhere data size is an issue

   Additional information:

      Magic number(s): first byte is usually 0x78 but can also be 0x08,
      0x18, 0x28, 0x38, 0x48, 0x58, or 0x68.
      File extension(s): N/A
      Macintosh file type code(s): N/A

   Person and email address to contact for further information: see
   http://www.zlib.net/

   Intended usage: COMMON

   Restrictions on usage: N/A

   Author: John Levine

   Change controller: IETF

3.  The Application/Gzip Media Type

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   The application/gzip media type describes a block of data that is
   compressed using gzip [RFC1952] compression.  The data is a stream of
   bytes as described in RFC 1952.

3.1.  Regsistration Details

   Type name: application

   Subtype name: gzip

   Required parameters: N/A

   Optional parameters: N/A

   Encoding considerations: needs base64 or other encoding that allows
   arbitrary binary data

   Security considerations: See section [security] below

   Interoperability considerations: N/A

   Published specification: [RFC1952]

   Applications that use this media type: anywhere data size is an issue

   Additional information:

      Magic number(s): first two bytes are 0x1f, 0x8b.
      File extension(s): gz
      Macintosh file type code(s): N/A

   Person and email address to contact for further information: see
   http://www.gzip.net/

   Intended usage: COMMON
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