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POgziping strings in a firefox extension
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  1. POgziping strings in a firefox extension
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    copied!<p>from this blog <a href="http://blog.mozilla.org/nfroyd/2012/01/26/compressing-strings-in-js/" rel="nofollow">http://blog.mozilla.org/nfroyd/2012/01/26/compressing-strings-in-js/</a> it seems like it should be possible, but I'm having trouble implementing (basically as is).</p> <p>my code is</p> <pre><code>function Accumulator() { this.buffer = ""; }; Accumulator.prototype = { buffer: null, onStartRequest: function(request, context) {}, onStopRequest: function(request, context, statusCode) {}, onDataAvailable: function(request, context, inputStream, offset, count) { var stream = Components.classes["@mozilla.org/binaryinputstream;1"].createInstance(Components.interfaces.nsIBinaryInputStream); stream.setInputStream(inputStream); var input = stream.readByteArray(count); this.buffer += String.fromCharCode.apply(input); } }; function compress(string) { var accumulator = new Accumulator(); var converter = Components.classes["@mozilla.org/streamconv;1?from=uncompressed&amp;to=gzip"].createInstance(Components.interfaces.nsIStreamConverter); // More respecifying input/output types. converter.asyncConvertData("uncompressed", "gzip", accumulator, null); // Oh, that method doesn't actually convert anything, it just prepares // the instance for doing conversion. var stream = Components.classes["@mozilla.org/io/string-input-stream;1"].createInstance(Components.interfaces.nsIStringInputStream); stream.data = string; converter.onStartRequest(null, null); converter.onDataAvailable(null, null, stream, 0, string.length); converter.onStopRequest(null, null, 201 /* 417 */); return accumulator.buffer; }; </code></pre> <p>but when I use it, I'm getting an error that converter.onRequestStart is not a function.</p> <p>wondering if I'm doing something obviously wrong?</p> <p>edit: </p> <p>1) fixing some obvious mistakes. Ci I didn't catch originally, it's Components.interfaces.</p> <p>2) original code seemed to have onRequestStart/Stop backwards, they should be onStartRequest/onStopRequest.</p> <p>with those changes, no longer throws any errors, but also returns an empty string, so nothing seems to be happening. :(</p>
 

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