I'm trying to make the following code work. It appears to load the data
into in inputStream correctly, as the inputStream.available() ==
data.length (54 in this example). However, the compressed data is never
sent to my listener. Instead, it calls onStartRequest() and then
onStopRequest() with status NS_ERROR_FAILURE (generic).
Thanks in advance!
--
var gzip64 =
'H4sIAAAAAAAAAwvJSFVIzCsuTy1SKMlXqMwvLVIoLE0tLsnMz1PILLZSMDQDAGz035IiAAAA';
// base64 encoded gzipped data that = 'The answer to your question is: 16'
var gzip = window.atob(gzip64);
gunzip(gzip);
function gunzip(data) {
// Store data in an input stream
var inputStream =
Components.classes["@mozilla.org/io/string-input-stream;1"].
createInstance(Components.interfaces.nsIStringInputStream);
inputStream.setData(data, data.length);
dd("Input stream has " + inputStream.available() + " available (data is
length " + data.length + ")");
// Load input stream onto a pump
var inputPump =
Components.classes["@mozilla.org/network/input-stream-pump;1"]
.createInstance(Components.interfaces.nsIInputStreamPump);
inputPump.init(inputStream, -1, -1, 0, 0, true);
// Create a generic stream converter service
var streamConv = Components.classes["@mozilla.org/streamConverters;1"].
createInstance(Components.interfaces.nsIStreamConverterService);
// Create a stream listener to accept gunzip'ed data
var gzipListener = {
data: "",
onStartRequest: function(request, context){
dd("gzip onStartRequest() called");
},
onDataAvailable: function(request, context, inputStream,
offset, count){
dd("gzip onDataAvailable() called");
var inStream =
Components.classes["@mozilla.org/scriptableinputstream;1"]
.createInstance(Components.interfaces.nsIScriptableInputStream);
inStream.init(inputStream);
this.data += inStream.read(count);
},
onStopRequest: function(request, context, statusCode){
dd("gzip onStopRequest() called with status " +
statusCode);
dd("Data is '" + this.data + "'");
}
};
// Create a specific gunzipper with my listener
var converter = streamConv.asyncConvertData("gzip", "uncompressed",
gzipListener, null);
// Set stream converter to read from input pump
inputPump.asyncRead(converter,null);
// No way yet to make this actually return data as it's async, but at
least
// I'll see the data in the debug if it can get uncompressed
}
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