diff -r 000000000000 -r 6474c204b198 netwerk/base/src/nsBase64Encoder.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/netwerk/base/src/nsBase64Encoder.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,32 @@
+/* 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 NSBASE64ENCODER_H_
+#define NSBASE64ENCODER_H_
+
+#include "nsIOutputStream.h"
+#include "nsString.h"
+#include "mozilla/Attributes.h"
+
+/**
+ * A base64 encoder. Usage: Instantiate class, write to it using
+ * Write(), then call Finish() to get the base64-encoded data.
+ */
+class nsBase64Encoder MOZ_FINAL : public nsIOutputStream {
+  public:
+    nsBase64Encoder() {}
+
+    NS_DECL_ISUPPORTS
+    NS_DECL_NSIOUTPUTSTREAM
+
+    nsresult Finish(nsCSubstring& _result);
+  private:
+    ~nsBase64Encoder() {}
+
+    /// The data written to this stream. nsCString can deal fine with
+    /// binary data.
+    nsCString mData;
+};
+
+#endif