@Override
    public void characters(char[] ch, int start, int length) throws SAXException {
        advance(length);
        super.characters(ch, start, length);
    }
Records the given number of output characters (or more accurately
UTF-16 code units). Throws an exception if the recorded number of
characters highly exceeds the number of input bytes read.

@param length number of new output characters produced
@throws SAXException if a zip bomb is detected
tika-core/src/main/java/org/apache/tika/sax/SecureContentHandler.java