Handle buffer boundaries in the WebVTT parser

Source/core/html/track/WebVTTParser.h

 /*
  * Copyright (C) 2011 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 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef WebVTTParser_h
 #define WebVTTParser_h
 
 #include "HTMLNames.h"
 #include "RuntimeEnabledFeatures.h"
 #include "core/dom/DocumentFragment.h"
 #include "core/fetch/TextResourceDecoder.h"
+#include "core/html/track/BufferedLineReader.h"
 #include "core/html/track/TextTrackCue.h"
 #include "core/html/track/VTTRegion.h"
 #include "core/html/track/WebVTTTokenizer.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/text/StringBuilder.h"
 
 namespace WebCore {
 
 using namespace HTMLNames;
 
@@ skipping 62 matching lines @@
     // Transfers ownership of last parsed cues to caller.
     void getNewCues(Vector<RefPtr<TextTrackCue> >&);
     void getNewRegions(Vector<RefPtr<VTTRegion> >&);
 
 private:
     WebVTTParser(WebVTTParserClient*, Document&);
 
     Document* m_document;
     ParseState m_state;
 
-    void parse(const String& textData);
+    void parse();
     void flushPendingCue();
     bool hasRequiredFileIdentifier(const String& line);
     ParseState collectCueId(const String&);
     ParseState collectTimingsAndSettings(const String&);
     ParseState collectCueText(const String&);
     ParseState ignoreBadCue(const String&);
 
     void createNewCue();
     void resetCueValues();
 
     void collectMetadataHeader(const String&);
     void createNewRegion();
 
     void skipWhiteSpace(const String&, unsigned*);
-    static void skipLineTerminator(const String& data, unsigned*);
-    static String collectNextLine(const String& data, unsigned*);
 
     String m_currentHeaderName;
     String m_currentHeaderValue;
 
+    BufferedLineReader m_lineReader;
     RefPtr<TextResourceDecoder> m_decoder;
     String m_currentId;
     double m_currentStartTime;
     double m_currentEndTime;
     StringBuilder m_currentContent;
     String m_currentSettings;
 
     WebVTTParserClient* m_client;
 
     Vector<RefPtr<TextTrackCue> > m_cuelist;
 
     Vector<RefPtr<VTTRegion> > m_regionList;
 };
 
 } // namespace WebCore
 
 #endif