diff -r 000000000000 -r 6474c204b198 netwerk/ipc/RemoteOpenFileChild.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/netwerk/ipc/RemoteOpenFileChild.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,115 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set sw=2 ts=8 et tw=80 : */
+/* 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 _RemoteOpenFileChild_h
+#define _RemoteOpenFileChild_h
+
+#include "mozilla/Attributes.h"
+#include "mozilla/dom/TabChild.h"
+#include "mozilla/net/PRemoteOpenFileChild.h"
+#include "nsICachedFileDescriptorListener.h"
+#include "nsILocalFile.h"
+#include "nsIRemoteOpenFileListener.h"
+
+namespace mozilla {
+
+namespace ipc {
+class FileDescriptor;
+}
+
+namespace net {
+
+/**
+ * RemoteOpenFileChild: a thin wrapper around regular nsIFile classes that does
+ * IPC to open a file handle on parent instead of child.  Used when we can't
+ * open file handle on child (don't have permission), but we don't want the
+ * overhead of shipping all I/O traffic across IPDL.  Example: JAR files.
+ *
+ * To open a file handle with this class, AsyncRemoteFileOpen() must be called
+ * first.  After the listener's OnRemoteFileOpenComplete() is called, if the
+ * result is NS_OK, nsIFile.OpenNSPRFileDesc() may be called--once--to get the
+ * file handle.
+ *
+ * Note that calling Clone() on this class results in the filehandle ownership
+ * being passed on to the new RemoteOpenFileChild. I.e. if
+ * OnRemoteFileOpenComplete is called and then Clone(), OpenNSPRFileDesc() will
+ * work in the cloned object, but not in the original.
+ *
+ * This class should only be instantiated in a child process.
+ *
+ */
+class RemoteOpenFileChild MOZ_FINAL
+  : public PRemoteOpenFileChild
+  , public nsIFile
+  , public nsIHashable
+  , public nsICachedFileDescriptorListener
+{
+  typedef mozilla::dom::TabChild TabChild;
+  typedef mozilla::ipc::FileDescriptor FileDescriptor;
+
+public:
+  RemoteOpenFileChild()
+    : mNSPRFileDesc(nullptr)
+    , mAsyncOpenCalled(false)
+    , mNSPROpenCalled(false)
+  {}
+
+  virtual ~RemoteOpenFileChild();
+
+  NS_DECL_THREADSAFE_ISUPPORTS
+  NS_DECL_NSIFILE
+  NS_DECL_NSIHASHABLE
+
+  // aRemoteOpenUri must be scheme 'remoteopenfile://': otherwise looks like
+  // a file:// uri.
+  nsresult Init(nsIURI* aRemoteOpenUri, nsIURI* aAppUri);
+
+  // Send message to parent to tell it to open file handle for file.
+  // TabChild is required, for IPC security.
+  // Note: currently only PR_RDONLY is supported for 'flags'
+  nsresult AsyncRemoteFileOpen(int32_t aFlags,
+                               nsIRemoteOpenFileListener* aListener,
+                               nsITabChild* aTabChild);
+
+  void ReleaseIPDLReference()
+  {
+    Release();
+  }
+
+private:
+  RemoteOpenFileChild(const RemoteOpenFileChild& other);
+
+protected:
+  void AddIPDLReference()
+  {
+    AddRef();
+  }
+
+  virtual bool Recv__delete__(const FileDescriptor&) MOZ_OVERRIDE;
+
+  virtual void OnCachedFileDescriptor(const nsAString& aPath,
+                                      const FileDescriptor& aFD) MOZ_OVERRIDE;
+
+  void HandleFileDescriptorAndNotifyListener(const FileDescriptor&,
+                                             bool aFromRecvDelete);
+
+  void NotifyListener(nsresult aResult);
+
+  // regular nsIFile object, that we forward most calls to.
+  nsCOMPtr<nsIFile> mFile;
+  nsCOMPtr<nsIURI> mURI;
+  nsCOMPtr<nsIURI> mAppURI;
+  nsCOMPtr<nsIRemoteOpenFileListener> mListener;
+  nsRefPtr<TabChild> mTabChild;
+  PRFileDesc* mNSPRFileDesc;
+  bool mAsyncOpenCalled;
+  bool mNSPROpenCalled;
+};
+
+} // namespace net
+} // namespace mozilla
+
+#endif // _RemoteOpenFileChild_h