半角英数・記号を全角に変換

/**
* 半角英数・記号を全角に変換
* @param src
* @return
*/
public static function toZenkaku(src:String):String {
var str:String = "";
var len:int = src.length;
for (var i:int= 0; i < len; i++) {
var c:Number = src.charCodeAt(i);
if ( c >= 33 && c <= 126 && c != 92 && c != 46) {
str += String.fromCharCode(c + 65248);
} else if (c == 39) {
str += String.fromCharCode(8217);
} else if (c == 34) {
str += String.fromCharCode(8221);
} else if (c == 32) {
str += String.fromCharCode(12288);
} else if (c == 126) {
str += String.fromCharCode(65507);
} else if (c == 92) {
str += String.fromCharCode(65509);
} else {
str += src.charAt(i);
}
}
return str;
}