Replace fopen() in JSON ride file reader

.. since it fails to open files with foreign characters in the
path name. We now read via QFile into a buffer.

src/JsonRideFile.l

@@ -79,3 +79,8 @@
 #if !defined(FLEX_SCANNER) || (YY_FLEX_SUBMINOR_VERSION < 9)
 int JsonRideFilelex_destroy(void) { return 0; }
 #endif
+
+void JsonRideFile_setString(QString p)
+{
+    JsonRideFile_scan_string(p.toLatin1().data());
+}

src/JsonRideFile.y

@@ -52,11 +52,10 @@ static QMap <QString, QString> JsonOverrides;
 
 // Lex scanner
 extern int JsonRideFilelex(); // the lexer aka yylex()
+extern void JsonRideFile_setString(QString);
 extern int JsonRideFilelex_destroy(void); // the cleaner for lexer
 
 // yacc parser
-extern void JsonRideFilerestart (FILE *input_file); // the lexer file restart aka yyrestart()
-extern FILE *JsonRideFilein; // used by the lexer aka yyin
 extern char *JsonRideFiletext; // set by the lexer aka yytext
 void JsonRideFileerror(const char *error) // used by parser aka yyerror()
 { JsonRideFileerrors << error; }
@@ -243,15 +242,25 @@ static int jsonFileReaderRegistered =
 RideFile *
 JsonFileReader::openRideFile(QFile &file, QStringList &errors, QList<RideFile*>*) const
 {
-    // jsonRide is local and static, used in the parser
-    // JsonRideFilein is the FILE * used by the lexer
-    JsonRideFilein = fopen(file.fileName().toLatin1(), "r");
-    if (JsonRideFilein == NULL) {
-        errors << "unable to open file (locale?)" + file.fileName();
-        return NULL; // failed to open the file ? 
+    // Read the entire file into a QString -- we avoid using fopen since it
+    // doesn't handle foreign characters well. Instead we use QFile and parse
+    // from a QString
+    QString contents;
+    if (file.exists() && file.open(QFile::ReadOnly | QFile::Text)) {
+
+        // read in the whole thing
+        QTextStream in(&file);
+        contents = in.readAll();
+        file.close();
+
+    } else {
+
+        errors << "unable to open file" + file.fileName();
+        return NULL; 
     }
+
     // inform the parser/lexer we have a new file
-    JsonRideFilerestart(JsonRideFilein);
+    JsonRideFile_setString(contents);
 
     // setup
     JsonRide = new RideFile;
@@ -265,9 +274,6 @@ JsonFileReader::openRideFile(QFile &file, QStringList &errors, QList<RideFile*>*
     // parse it
     JsonRideFileparse();
 
-    // release the file handle
-    fclose(JsonRideFilein);
-
     // clean up
     JsonRideFilelex_destroy();