Added the methods to check which kind of tags the file actually has.

taglib/ogg/flac/oggflacfile.cpp

@@ -287,3 +287,8 @@ void Ogg::FLAC::File::scan()
 
   d->scanned = true;
 }
+
+bool Ogg::FLAC::File::hasXiphComment() const
+{
+  return d->hasXiphComment;
+}

taglib/ogg/flac/oggflacfile.h

@@ -128,6 +128,11 @@ namespace TagLib {
        */
       long streamLength();
 
+      /*!
+       * Returns whether or not the file on disk contains a Xiph comment.
+       */
+      bool hasXiphComment() const;
+
     private:
       File(const File &);
       File &operator=(const File &);