The Tor Browser / file revision

 var Cc = Components.classes;

 var Ci = Components.interfaces;

 var Cu = Components.utils;

 Cu.import("resource://gre/modules/Services.jsm");

 Cu.import("resource://gre/modules/NetUtil.jsm");

 function handleRequest(aRequest, aResponse) {

   aResponse.setHeader("Access-Control-Allow-Origin", "*", false);

   var query = getQuery(aRequest);

   if ("setVersion" in query) {

     setState("version", query.setVersion);

     aResponse.write("OK");

     return;

   }

   var version = Number(getState("version"));

   // setPrecompile sets the "precompile" field in the app manifest

   if ("setPrecompile" in query) {

     setState("precompile", query.setPrecompile);

     aResponse.write("OK");

     return;

   }

   var precompile = getState("precompile");

   if ("getPackage" in query) {

     aResponse.setHeader("Content-Type", "application/zip", false);

     aResponse.write(buildAppPackage(version, precompile));

     return;

   }

   if ("getManifest" in query) {

     aResponse.setHeader("Content-Type", "application/x-web-app-manifest+json", false);

     aResponse.write(getManifest(version, precompile));

     return;

   }

 }

 function getQuery(aRequest) {

   var query = {};

   aRequest.queryString.split('&').forEach(function(val) {

     var [name, value] = val.split('=');

     query[decodeURIComponent(name)] = decodeURIComponent(value);

   });

   return query;

 }

 function getTestFile(aName) {

   var file = Services.dirsvc.get("CurWorkD", Ci.nsIFile);

   var path = "chrome/dom/apps/tests/asmjs/" + aName;

   path.split("/").forEach(function(component) {

     file.append(component);

   });

   return file;

 }

 function readFile(aFile) {

   var fstream = Cc["@mozilla.org/network/file-input-stream;1"].

                 createInstance(Ci.nsIFileInputStream);

   fstream.init(aFile, -1, 0, 0);

   var data = NetUtil.readInputStreamToString(fstream, fstream.available());

   fstream.close();

   return data;

 }

 function getManifest(aVersion, aPrecompile) {

   return readFile(getTestFile("manifest.webapp")).

            replace(/VERSIONTOKEN/g, aVersion).

            replace(/PRECOMPILETOKEN/g, aPrecompile);

 }

 function buildAppPackage(aVersion, aPrecompile) {

   const PR_RDWR        = 0x04;

   const PR_CREATE_FILE = 0x08;

   const PR_TRUNCATE    = 0x20;

   let zipFile = Services.dirsvc.get("TmpD", Ci.nsIFile);

   zipFile.append("application.zip");

   let zipWriter = Cc["@mozilla.org/zipwriter;1"].createInstance(Ci.nsIZipWriter);

   zipWriter.open(zipFile, PR_RDWR | PR_CREATE_FILE | PR_TRUNCATE);

   // Add index.html file to the zip file

   zipWriter.addEntryFile("index.html",

                          Ci.nsIZipWriter.COMPRESSION_NONE,

                          getTestFile("index.html"),

                          false);

   // Add manifest to the zip file

   var manStream = Cc["@mozilla.org/io/string-input-stream;1"].

                   createInstance(Ci.nsIStringInputStream);

   var manifest = getManifest(aVersion, aPrecompile);

   manStream.setData(manifest, manifest.length);

   zipWriter.addEntryStream("manifest.webapp", Date.now(),

                            Ci.nsIZipWriter.COMPRESSION_NONE,

                            manStream, false);

   // Add an asm.js module to the zip file

   // The module also contains some code to perform tests

   // Creates a module big enough to be cached

   // The module is different according to the app version, this way

   // we can test that on update the new module is compiled

   var code = "function f() { 'use asm';\n";

   for (var i = 0; i < 5000; i++) {

     code += "function g" + i + "() { return " + i + "}\n";

   }

   code += "return g" + aVersion + " }\n\

 var jsFuns = SpecialPowers.Cu.getJSTestingFunctions();\n\

 ok(jsFuns.isAsmJSCompilationAvailable(), 'asm.js compilation is available');\n\

 ok(jsFuns.isAsmJSModule(f), 'f is an asm.js module');\n\

 var g" + aVersion + " = f();\n\

 ok(jsFuns.isAsmJSFunction(g" + aVersion + "), 'g" + aVersion + " is an asm.js function');\n\

 ok(g" + aVersion + "() === " + aVersion + ", 'g" + aVersion + " returns the correct result');";

   // If the "precompile" field contains this module, we test that it is loaded

   // from the cache.

   // If the "precompile" field doesn't contain the module or is incorrect, we

   // test that the module is not loaded from the cache.

   if (aPrecompile == '["asmjsmodule.js"]') {

     code += "ok(jsFuns.isAsmJSModuleLoadedFromCache(f), 'module loaded from cache');\n";

   } else {

     code += "ok(!jsFuns.isAsmJSModuleLoadedFromCache(f), 'module not loaded from cache');\n";

   }

   code += "alert('DONE');";

   var jsStream = Cc["@mozilla.org/io/string-input-stream;1"].

                  createInstance(Ci.nsIStringInputStream);

   jsStream.setData(code, code.length);

   zipWriter.addEntryStream("asmjsmodule.js", Date.now(),

                            Ci.nsIZipWriter.COMPRESSION_NONE,

                            jsStream, false);

   zipWriter.close();

   return readFile(zipFile);

 }