1 files changed, 50 insertions, 0 deletions
diff --git a/ipc/glue/InputStreamUtils.h b/ipc/glue/InputStreamUtils.h
new file mode 100644
index 0000000000..27a65b02e2
--- /dev/null
+++ b/ipc/glue/InputStreamUtils.h
@@ -0,0 +1,50 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 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 mozilla_ipc_InputStreamUtils_h
+#define mozilla_ipc_InputStreamUtils_h
+
+#include "mozilla/ipc/InputStreamParams.h"
+#include "nsCOMPtr.h"
+#include "nsIInputStream.h"
+#include "nsTArray.h"
+
+namespace mozilla {
+namespace ipc {
+
+class FileDescriptor;
+
+// If you want to serialize an inputStream, please use SerializeIPCStream or
+// nsIInputStream directly.
+class InputStreamHelper {
+ public:
+  static void SerializedComplexity(nsIInputStream* aInputStream,
+                                   uint32_t aMaxSize, uint32_t* aSizeUsed,
+                                   uint32_t* aPipes, uint32_t* aTransferables);
+
+  // These 2 methods allow to serialize an inputStream into InputStreamParams.
+  // The manager is needed in case a stream needs to serialize itself as
+  // IPCRemoteStream.
+  // The stream serializes itself fully only if the resulting IPC message will
+  // be smaller than |aMaxSize|. Otherwise, the stream serializes itself as a
+  // DataPipe, and, its content will be sent to the other side of the IPC pipe
+  // in chunks. The IPC message size is returned into |aSizeUsed|.
+  static void SerializeInputStream(nsIInputStream* aInputStream,
+                                   InputStreamParams& aParams,
+                                   uint32_t aMaxSize, uint32_t* aSizeUsed);
+
+  // When a stream wants to serialize itself as a DataPipe, it uses this method.
+  static void SerializeInputStreamAsPipe(nsIInputStream* aInputStream,
+                                         InputStreamParams& aParams);
+
+  static already_AddRefed<nsIInputStream> DeserializeInputStream(
+      const InputStreamParams& aParams);
+};
+
+}  // namespace ipc
+}  // namespace mozilla
+
+#endif  // mozilla_ipc_InputStreamUtils_h