FYI,
Just "for fun" I used the Java LZMA implementation as the basis for a GWT module implementing the LZMA algorithm. It's not particularly fast but it works.
For what it's worth...
[http://code.google.com/p/gwt-lzma/][1]
There is a working demo linked from the home page.
Enjoy,
-Archie
[1]: http://code.google.com/p/gwt-lzma/ "gwt-lzma GWT LZMA module".
2009-12-18 02:29:06 UTC in 7-Zip