diff -r 000000000000 -r 6474c204b198 embedding/browser/webBrowser/nsEmbedStream.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/embedding/browser/webBrowser/nsEmbedStream.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,97 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#include "nsIAsyncInputStream.h"
+#include "nsIAsyncOutputStream.h"
+#include "nsIDocShell.h"
+#include "nsIInterfaceRequestorUtils.h"
+#include "nsIPipe.h"
+
+#include "nsEmbedStream.h"
+#include "nsError.h"
+#include "nsString.h"
+
+NS_IMPL_ISUPPORTS0(nsEmbedStream)
+
+nsEmbedStream::nsEmbedStream()
+{
+  mOwner = nullptr;
+}
+
+nsEmbedStream::~nsEmbedStream()
+{
+}
+
+void
+nsEmbedStream::InitOwner(nsIWebBrowser *aOwner)
+{
+  mOwner = aOwner;
+}
+
+NS_METHOD
+nsEmbedStream::Init(void)
+{
+  return NS_OK;
+}
+
+NS_METHOD
+nsEmbedStream::OpenStream(nsIURI *aBaseURI, const nsACString& aContentType)
+{
+  nsresult rv;
+  NS_ENSURE_ARG_POINTER(aBaseURI);
+  NS_ENSURE_TRUE(IsASCII(aContentType), NS_ERROR_INVALID_ARG);
+
+  // if we're already doing a stream, return an error
+  if (mOutputStream)
+    return NS_ERROR_IN_PROGRESS;
+
+  nsCOMPtr<nsIAsyncInputStream> inputStream;
+  nsCOMPtr<nsIAsyncOutputStream> outputStream;
+  rv = NS_NewPipe2(getter_AddRefs(inputStream),
+                   getter_AddRefs(outputStream),
+                   true, false, 0, UINT32_MAX);
+  if (NS_FAILED(rv))
+    return rv;
+
+  nsCOMPtr<nsIDocShell> docShell = do_GetInterface(mOwner);
+  rv = docShell->LoadStream(inputStream, aBaseURI, aContentType,
+                            EmptyCString(), nullptr);
+  if (NS_FAILED(rv))
+    return rv;
+
+  mOutputStream = outputStream;
+  return rv;
+}
+
+NS_METHOD
+nsEmbedStream::AppendToStream(const uint8_t *aData, uint32_t aLen)
+{
+  nsresult rv;
+  NS_ENSURE_STATE(mOutputStream);
+
+  uint32_t bytesWritten = 0;
+  rv = mOutputStream->Write(reinterpret_cast<const char*>(aData),
+                            aLen, &bytesWritten);
+  if (NS_FAILED(rv))
+    return rv;
+
+  NS_ASSERTION(bytesWritten == aLen,
+               "underlying buffer couldn't handle the write");
+  return rv;
+}
+
+NS_METHOD
+nsEmbedStream::CloseStream(void)
+{
+  nsresult rv = NS_OK;
+
+  // NS_ENSURE_STATE returns NS_ERROR_UNEXPECTED if the condition isn't
+  // satisfied; this is exactly what we want to return.
+  NS_ENSURE_STATE(mOutputStream);
+  mOutputStream->Close();
+  mOutputStream = 0;
+
+  return rv;
+}