Use MIDIMessageQueue/IsValidWebMIDIData for MIDI byte stream validation

content/browser/renderer_host/media/midi_host.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_MEDIA_MIDI_HOST_H_
 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_MIDI_HOST_H_
 
 #include <vector>
 
+#include "base/gtest_prod_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/scoped_vector.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/browser_message_filter.h"
 #include "content/public/browser/browser_thread.h"
 #include "media/midi/midi_manager.h"
 
 namespace media {
 class MIDIManager;
+class MIDIMessageQueue;
 }
 
 namespace content {
 
 class CONTENT_EXPORT MIDIHost
     : public BrowserMessageFilter,
       public media::MIDIManagerClient {
  public:
   // Called from UI thread from the owner of this object.
   MIDIHost(int renderer_process_id, media::MIDIManager* midi_manager);
 
   // BrowserMessageFilter implementation.
   virtual void OnDestruct() const OVERRIDE;
   virtual bool OnMessageReceived(const IPC::Message& message,
                                  bool* message_was_ok) OVERRIDE;
 
   // MIDIManagerClient implementation.
-  virtual void ReceiveMIDIData(
-      uint32 port,
-      const uint8* data,
-      size_t length,
-      double timestamp) OVERRIDE;
+  virtual void ReceiveMIDIData(uint32 port,
+                               const uint8* data,
+                               size_t length,
+                               double timestamp) OVERRIDE;
   virtual void AccumulateMIDIBytesSent(size_t n) OVERRIDE;
 
   // Start session to access MIDI hardware.
   void OnStartSession(int client_id);
 
   // Data to be sent to a MIDI output port.
   void OnSendData(uint32 port,
                   const std::vector<uint8>& data,
                   double timestamp);
 
  private:
+  FRIEND_TEST_ALL_PREFIXES(MIDIHostTest, IsValidWebMIDIData);
   friend class base::DeleteHelper<MIDIHost>;
   friend class BrowserThread;
 
   virtual ~MIDIHost();
 
+  // Returns true if |data| fulfills the requirements of MIDIOutput.send API
+  // defined in the WebMIDI spec.
+  // - |data| must be any number of complete MIDI messages (data abbreviation
+  //    called "running status" is disallowed).
+  // - 1-byte MIDI realtime messages can be placed at any position of |data|.
+  static bool IsValidWebMIDIData(const std::vector<uint8>& data);
+
   int renderer_process_id_;
 
+  // Represents if the renderer has a permission to send/receive MIDI SysEX
+  // messages.
+  bool has_sys_ex_permission_;
+
   // |midi_manager_| talks to the platform-specific MIDI APIs.
   // It can be NULL if the platform (or our current implementation)
   // does not support MIDI.  If not supported then a call to
   // OnRequestAccess() will always refuse access and a call to
   // OnSendData() will do nothing.
   media::MIDIManager* const midi_manager_;
 
+  // Buffers where data sent from each MIDI input port is stored.
+  ScopedVector<media::MIDIMessageQueue> received_messages_queues_;
+
   // The number of bytes sent to the platform-specific MIDI sending
   // system, but not yet completed.
   size_t sent_bytes_in_flight_;
 
   // The number of bytes successfully sent since the last time
   // we've acknowledged back to the renderer.
   size_t bytes_sent_since_last_acknowledgement_;
 
   // Protects access to |sent_bytes_in_flight_|.
   base::Lock in_flight_lock_;
 
   DISALLOW_COPY_AND_ASSIGN(MIDIHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_MIDI_HOST_H_