diff -r 000000000000 -r 6474c204b198 dom/encoding/TextEncoder.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/encoding/TextEncoder.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,107 @@
+/* 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/. */
+
+#ifndef mozilla_dom_textencoder_h_
+#define mozilla_dom_textencoder_h_
+
+#include "mozilla/dom/NonRefcountedDOMObject.h"
+#include "mozilla/dom/TextEncoderBinding.h"
+#include "mozilla/dom/TypedArray.h"
+#include "nsIUnicodeEncoder.h"
+
+namespace mozilla {
+class ErrorResult;
+
+namespace dom {
+
+class TextEncoder MOZ_FINAL : public NonRefcountedDOMObject
+{
+public:
+  // The WebIDL constructor.
+
+  static TextEncoder*
+  Constructor(const GlobalObject& aGlobal,
+              const nsAString& aEncoding,
+              ErrorResult& aRv)
+  {
+    nsAutoPtr<TextEncoder> txtEncoder(new TextEncoder());
+    txtEncoder->Init(aEncoding, aRv);
+    if (aRv.Failed()) {
+      return nullptr;
+    }
+    return txtEncoder.forget();
+  }
+
+  TextEncoder()
+  {
+  }
+
+  virtual
+  ~TextEncoder()
+  {}
+
+  JSObject* WrapObject(JSContext* aCx, bool* aTookOwnership)
+  {
+    return TextEncoderBinding::Wrap(aCx, this, aTookOwnership);
+  }
+
+  void Encode(JSContext* aCx,
+	      JS::Handle<JSObject*> aObj,
+	      const nsAString& aString,
+	      const TextEncodeOptions& aOptions,
+	      JS::MutableHandle<JSObject*> aRetval,
+	      ErrorResult& aRv) {
+    TextEncoder::Encode(aCx, aObj, aString, aOptions.mStream, aRetval, aRv);
+  }
+
+protected:
+
+  /**
+   * Validates provided encoding and throws an exception if invalid encoding.
+   * If no encoding is provided then mEncoding is default initialised to "utf-8".
+   *
+   * @param aEncoding    Optional encoding (case insensitive) provided.
+   *                     (valid values are "utf-8", "utf-16", "utf-16be")
+   *                     Default value is "utf-8" if no encoding is provided.
+   * @return aRv         EncodingError exception else null.
+   */
+  void Init(const nsAString& aEncoding, ErrorResult& aRv);
+
+public:
+  /**
+   * Return the encoding name.
+   *
+   * @param aEncoding, current encoding.
+   */
+  void GetEncoding(nsAString& aEncoding);
+
+  /**
+   * Encodes incoming utf-16 code units/ DOM string to the requested encoding.
+   *
+   * @param aCx        Javascript context.
+   * @param aObj       the wrapper of the TextEncoder
+   * @param aString    utf-16 code units to be encoded.
+   * @param aOptions   Streaming option. Initialised by default to false.
+   *                   If the streaming option is false, then the encoding
+   *                   algorithm state will get reset. If set to true then
+   *                   the previous encoding is reused/continued.
+   * @return JSObject* The Uint8Array wrapped in a JS object.  Returned via
+   *                   the aRetval out param.
+   */
+  void Encode(JSContext* aCx,
+	      JS::Handle<JSObject*> aObj,
+	      const nsAString& aString,
+	      const bool aStream,
+	      JS::MutableHandle<JSObject*> aRetval,
+	      ErrorResult& aRv);
+
+private:
+  nsCString mEncoding;
+  nsCOMPtr<nsIUnicodeEncoder> mEncoder;
+};
+
+} // dom
+} // mozilla
+
+#endif // mozilla_dom_textencoder_h_