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+/* -*- 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