diff -r 000000000000 -r 6474c204b198 toolkit/components/workerlz4/lz4_internal.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/workerlz4/lz4_internal.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,57 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+if (typeof Components != "undefined") {
+  throw new Error("This file is meant to be loaded in a worker");
+}
+if (!module || !exports) {
+  throw new Error("Please load this module with require()");
+}
+
+let SharedAll = require("resource://gre/modules/osfile/osfile_shared_allthreads.jsm");
+let libxul = new SharedAll.Library("libxul", SharedAll.Constants.Path.libxul);
+let Type = SharedAll.Type;
+
+let Primitives = {};
+
+libxul.declareLazyFFI(Primitives, "compress",
+  "workerlz4_compress",
+  null,
+  /*return*/ Type.size_t,
+  /*const source*/ Type.void_t.in_ptr,
+  /*inputSize*/ Type.size_t,
+  /*dest*/ Type.void_t.out_ptr
+);
+
+libxul.declareLazyFFI(Primitives, "decompress",
+  "workerlz4_decompress",
+  null,
+  /*return*/ Type.int,
+  /*const source*/ Type.void_t.in_ptr,
+  /*inputSize*/ Type.size_t,
+  /*dest*/ Type.void_t.out_ptr,
+  /*maxOutputSize*/ Type.size_t,
+  /*actualOutputSize*/ Type.size_t.out_ptr
+);
+
+libxul.declareLazyFFI(Primitives, "maxCompressedSize",
+  "workerlz4_maxCompressedSize",
+  null,
+  /*return*/ Type.size_t,
+  /*inputSize*/ Type.size_t
+);
+
+module.exports = {
+  get compress() {
+    return Primitives.compress;
+  },
+  get decompress() {
+    return Primitives.decompress;
+  },
+  get maxCompressedSize() {
+    return Primitives.maxCompressedSize;
+  }
+};