Web MIDI: move MIDI message validating logic into message_util.{cc|h}

media/midi/midi_message_util.cc

-// Copyright 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.
-
-#include "base/logging.h"
-#include "media/midi/midi_message_util.h"
-
-namespace midi {
-
-size_t GetMidiMessageLength(uint8_t status_byte) {
-  if (status_byte < 0x80)
-    return 0;
-  if (0x80 <= status_byte && status_byte <= 0xbf)
-    return 3;
-  if (0xc0 <= status_byte && status_byte <= 0xdf)
-    return 2;
-  if (0xe0 <= status_byte && status_byte <= 0xef)
-    return 3;
-
-  switch (status_byte) {
-    case 0xf0:
-      return 0;
-    case 0xf1:
-      return 2;
-    case 0xf2:
-      return 3;
-    case 0xf3:
-      return 2;
-    case 0xf4:  // Reserved
-    case 0xf5:  // Reserved
-      return 0;
-    case 0xf6:
-      return 1;
-    case 0xf7:
-      return 0;
-    case 0xf8:
-    case 0xf9:
-    case 0xfa:
-    case 0xfb:
-    case 0xfc:
-    case 0xfd:
-    case 0xfe:
-    case 0xff:
-      return 1;
-    default:
-      NOTREACHED();
-      return 0;
-  }
-}
-
-}  // namespace midi