Web MIDI: tentative sysex check for receiving messages

Source/modules/webmidi/MIDIInput.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 12 matching lines @@
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "modules/webmidi/MIDIInput.h"
+
+#include "modules/webmidi/MIDIAccess.h"
 #include "modules/webmidi/MIDIMessageEvent.h"
 
 namespace WebCore {
 
 PassRefPtr<MIDIInput> MIDIInput::create(MIDIAccess* access, ScriptExecutionContext* context, const String& id, const String& manufacturer, const String& name, const String& version)
 {
     ASSERT(access);
     return adoptRef(new MIDIInput(access, context, id, manufacturer, name, version));
 }
 
 MIDIInput::MIDIInput(MIDIAccess* access, ScriptExecutionContext* context, const String& id, const String& manufacturer, const String& name, const String& version)
     : MIDIPort(context, id, manufacturer, name, MIDIPortTypeInput, version)
     , m_access(access)
 {
     ScriptWrappable::init(this);
 }
 
 void MIDIInput::didReceiveMIDIData(unsigned portIndex, const unsigned char* data, size_t length, double timeStamp)
 {
     ASSERT(isMainThread());
 
     // The received MIDI data may contain one or more messages.
     // The Web MIDI API requires that a separate event be dispatched for each message,
     // so we walk through the data and dispatch one at a time.
     size_t i = 0;
     while (i < length) {
         unsigned char status = data[i];
         unsigned char strippedStatus = status & 0xf0;
 
-        // FIXME: support System Exclusive.
-        if (strippedStatus >= 0xf0)
+        // FIXME: integrate sending side filtering and implement more extensive filtering.
+        if (strippedStatus >= 0xf0 && !m_access->sysExEnabled())
             break;
 
         // All non System Exclusive messages have a total size of 3 except for Program Change and Channel Pressure.
         size_t totalMessageSize = (strippedStatus == 0xc0 || strippedStatus == 0xd0) ? 2 : 3;
 
         if (i + totalMessageSize <= length) {
             RefPtr<Uint8Array> array = Uint8Array::create(totalMessageSize);
             array->setRange(data + i, totalMessageSize, 0);
 
             dispatchEvent(MIDIMessageEvent::create(timeStamp, array));
         }
 
         i += totalMessageSize;
     }
 }
 
 } // namespace WebCore