1 files changed, 118 insertions, 0 deletions
diff --git a/media/mtransport/transportlayer.h b/media/mtransport/transportlayer.h
new file mode 100644
index 000000000..fb40904c3
--- /dev/null
+++ b/media/mtransport/transportlayer.h
@@ -0,0 +1,118 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=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/. */
+
+// Original author: ekr@rtfm.com
+
+#ifndef transportlayer_h__
+#define transportlayer_h__
+
+#include "sigslot.h"
+
+#include "mozilla/DebugOnly.h"
+#include "mozilla/RefPtr.h"
+#include "nsCOMPtr.h"
+#include "nsIEventTarget.h"
+
+#include "m_cpp_utils.h"
+
+namespace mozilla {
+
+class TransportFlow;
+
+typedef int TransportResult;
+
+enum {
+  TE_WOULDBLOCK = -1, TE_ERROR = -2, TE_INTERNAL = -3
+};
+
+#define TRANSPORT_LAYER_ID(name) \
+  virtual const std::string id() const { return name; } \
+  static std::string ID() { return name; }
+
+// Abstract base class for network transport layers.
+class TransportLayer : public sigslot::has_slots<> {
+ public:
+  // The state of the transport flow
+  // We can't use "ERROR" because Windows has a macro named "ERROR"
+  enum State { TS_NONE, TS_INIT, TS_CONNECTING, TS_OPEN, TS_CLOSED, TS_ERROR };
+
+  // Is this a stream or datagram flow
+  TransportLayer() :
+    state_(TS_NONE),
+    flow_id_(),
+    downward_(nullptr) {}
+
+  virtual ~TransportLayer() {}
+
+  // Called to initialize
+  nsresult Init();  // Called by Insert() to set up -- do not override
+  virtual nsresult InitInternal() { return NS_OK; } // Called by Init
+
+  // Called when inserted into a flow
+  virtual void Inserted(TransportFlow *flow, TransportLayer *downward);
+
+  // Downward interface
+  TransportLayer *downward() { return downward_; }
+
+  // Get the state
+  State state() const { return state_; }
+  // Must be implemented by derived classes
+  virtual TransportResult SendPacket(const unsigned char *data, size_t len) = 0;
+
+  // Get the thread.
+  const nsCOMPtr<nsIEventTarget> GetThread() const {
+    return target_;
+  }
+
+  // Event definitions that one can register for
+  // State has changed
+  sigslot::signal2<TransportLayer*, State> SignalStateChange;
+  // Data received on the flow
+  sigslot::signal3<TransportLayer*, const unsigned char *, size_t>
+                         SignalPacketReceived;
+
+  // Return the layer id for this layer
+  virtual const std::string id() const = 0;
+
+  // The id of the flow
+  const std::string& flow_id() const {
+    return flow_id_;
+  }
+
+ protected:
+  virtual void WasInserted() {}
+  virtual void SetState(State state, const char *file, unsigned line);
+  // Check if we are on the right thread
+  void CheckThread() const {
+    MOZ_ASSERT(CheckThreadInt(), "Wrong thread");
+  }
+
+  State state_;
+  std::string flow_id_;
+  TransportLayer *downward_; // The next layer in the stack
+  nsCOMPtr<nsIEventTarget> target_;
+
+ private:
+  DISALLOW_COPY_ASSIGN(TransportLayer);
+
+  bool CheckThreadInt() const {
+    bool on;
+
+    if (!target_)  // OK if no thread set.
+      return true;
+
+    NS_ENSURE_SUCCESS(target_->IsOnCurrentThread(&on), false);
+    NS_ENSURE_TRUE(on, false);
+
+    return true;
+  }
+};
+
+#define LAYER_INFO "Flow[" << flow_id() << "(none)" << "]; Layer[" << id() << "]: "
+#define TL_SET_STATE(x) SetState((x), __FILE__, __LINE__)
+
+}  // close namespace
+#endif