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Copyright 2003 Sun Microsystems, Inc.  All Rights Reserved.

This code is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License version 2 only, as
published by the Free Software Foundation.  Sun designates this
particular file as subject to the "Classpath" exception as provided
by Sun in the LICENSE file that accompanied this code.

This code is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
version 2 for more details (a copy is included in the LICENSE file that
accompanied this code).

You should have received a copy of the GNU General Public License version
2 along with this work; if not, write to the Free Software Foundation,
Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
CA 95054 USA or visit if you need additional information or
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This package provides methods to read files from a JAR file and
to transform them to a more compact transfer format called Pack200.
It also provides methods to receive the transmitted data and expand
it into a JAR file equivalent to the original JAR file.

The <tt>pack</tt> methods may be used by application developers
who wish to deploy large JARs on the web.  The <tt>unpack</tt> methods may be used 
by deployment applications such as Java Web Start and Java Plugin.

In typical use, the packed output should be further compressed using
a suitable tool such as gzip or <tt></tt>.
The resulting file (with a suffix ".pack.gz") should be hosted on a HTTP/1.1
compliant server, which will be capable of handling "Accept-Encoding",
as specified by the HTTP 1.1 RFC2616 specification.

<b>NOTE:</b> It is recommended that the original ".jar" file be hosted
in addition to the ".pack.gz" file, so that older client implementations
will continue to work reliably.
(On-demand compression by the server is not recommended.)

When a client application requests a ".jar" file (call it "Large.jar"),
the client will transmit the  headers
"Content-Type=application/x-java-archive" as well as "Accept-Encoding=pack200-gzip".
This indicates to the server that the client application desires an version
of the file encoded with Pack200 and further compressed with gzip.

The server implementation will typically check for the existence of "Large.pack.gz".
If that file is available, the server will transmit it with the headers
"Content-Encoding=pack200-gzip" and "Content-Type=application/x-java-archive". 

If the ".pack.gz" file, is not available, then the server will transmit
the original ".jar"
with "Content-Encoding=null" and "Content-Type=application/x-java-archive".

A MIME type of "application/x-java-pack200" may be specified by the
client application to indicate a ".pack" file is required.
However, this has limited capability, and is not recommended.

<h2> Package Specification</h2>
Network Transfer Format Specification :<a href=""></a>

<h2> Related Documentation</h2>
For overviews, tutorials, examples, guides, and tool documentation, please

Jar File Specification :<a href=""></a></li>

Java Virtual Machine Specification : <a href=""></a></li>

Hypertext Transfer Protocol -- HTTP/1.1 : <a href="">

@since JDK1.5.0</li>

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