protected void reset() {
        state = EMB_STATE.NADA;
        os.reset();
        metadata = new Metadata();
        hi = -1;
        sv = EMPTY_STRING;
        sn = EMPTY_STRING;
        sb.setLength(0);
        isPictBitmap = false;
    }
reset state after each object.
Do not reset unknown file number.
tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-microsoft-module/src/main/java/org/apache/tika/parser/microsoft/rtf/RTFEmbObjHandler.java