Getting Channel Input Stream

[xunshirine]

Hello.

I am trying to get a Gzip file on my server and convert the data into
normal (say the file resides at http://example.com/example.gz )

I found below code. It requires an input stream to pass to
convertlistener but I can not able to create an input stream from a
channel. How can I pass input stream of the channel?

Thanks.


          //listener for the converted data
          var listener =
          {
             onDataAvailable : function(request, context, inputStream,
offset, count)
             {
                //write the data
                     var output = Components.classes["@mozilla.org/
network/file-output-stream;1"].createInstance
(Components.interfaces.nsIFileOutputStream);

                                    //outputFile is a file which will
contain the gunzipped data
                if(!outputFile.exists())
                         output.init(outputFile, 0x02 | 0x08, 0644,
0);

                else
                         output.init(outputFile, 0x02 | 0x10, 0644,
0);

                      var scriptable = Components.classes
["@mozilla.org/scriptableinputstream;1"].createInstance
(Components.interfaces.nsIScriptableInputStream);
                   scriptable.init(inputStream);

                var data = scriptable.read(inputStream.available());
                output.write(data, data.length);

                output.close();
             },

             onStartRequest : function(request, context)
             {
             },

             onStopRequest : function(request, context)
             {
             }
          };

          //fake uri needed to create a channel
          var uri = Components.classes["@mozilla.org/network/simple-
uri;1"].createInstance(Components.interfaces.nsIURI);
          uri.scheme = "http://example.com/example.gz";;


          var chan = Components.classes["@mozilla.org/network/input-
stream-channel;1"].createInstance
(Components.interfaces.nsIInputStreamChannel);
          chan.setURI(uri);


          var request = chan.QueryInterface
(Components.interfaces.nsIRequest);

          // Attempt to gunzip
          var conv = Components.classes["@mozilla.org/streamconv;1?
from=gzip&to=uncompressed"].createInstance
(Components.interfaces.nsIStreamConverter);

          conv.asyncConvertData("gzip", "uncompressed", listener,
null);

          conv.onStartRequest(request, null);

          //input is an inputstream which contains the gzipped data
          var avail = input.available();

          //really do the conversion
          conv.onDataAvailable(request, null, input, 0, avail);

          var status = {};
          conv.onStopRequest(request, null, status);

          input.close();
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