private boolean processAny() throws IOException {
        int read = stream.read();
        return read != -1;
    }
A scanner meant to detect charset meta tags in a byte stream
See: https://html.spec.whatwg.org/multipage/parsing.html#prescan-a-byte-stream-to-determine-its-encoding
tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-html-module/src/main/java/org/apache/tika/parser/html/charsetdetector/PreScanner.java