Optimize WebURL::protocolIs

third_party/WebKit/Source/platform/exported/WebURL.cpp

 /*
  * Copyright (C) 2009 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 13 matching lines @@
  * 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 "public/platform/WebURL.h"
 
 #include "platform/weborigin/KURL.h"
+#include "wtf/text/StringView.h"
 
 namespace blink {
 
 bool WebURL::protocolIs(const char* protocol) const {
-  return ::blink::protocolIs(m_string, protocol);
+  const url::Component& scheme = m_parsed.scheme;
+  StringView urlView = m_string;
+  // For subtlety why this works in all cases, see KURL::componentString.
+  return m_isValid && StringView(urlView, scheme.begin, scheme.len) == protocol;
 }
 
 WebURL::WebURL(const KURL& url)
     : m_string(url.getString()),
       m_parsed(url.parsed()),
       m_isValid(url.isValid()) {}
 
 WebURL& WebURL::operator=(const KURL& url) {
   m_string = url.getString();
   m_parsed = url.parsed();
   m_isValid = url.isValid();
   return *this;
 }
 
 WebURL::operator KURL() const {
   return KURL(m_string, m_parsed, m_isValid);
 }
 
 }  // namespace blink