@Override
    public void characters(char[] ch, int start, int length)
            throws SAXException {
        try {
            for (int j = 0; j < length; j++) {
                char c = ch[start + j];
                switch (c) {
                    case '<':
                        this.writer.write("&lt;");
                        break;
                    case '>':
                        this.writer.write("&gt;");
                        break;
                    case '&':
                        this.writer.write("&amp;");
                        break;
                    default:
                        this.writer.write(c);
                }
            }
        } catch (IOException ioe) {
            throw (SAXException)new SAXException(ioe).initCause(ioe);
        }
    }
Writes out characters.

@param ch
           the source array
@param start
           the index of the first character to be written
@param length
           the number of characters to write

@throws SAXException
            if there are IO problems
src/nu/validator/xml/HtmlSerializer.java