Hi Ticker, I've never tried to understand that code, but yes, masking a position looks wrong. Gerd ________________________________________ Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von Ticker Berkin <rwb-mkgmap@jagit.co.uk> Gesendet: Montag, 18. Oktober 2021 10:52 An: Development list for mkgmap Betreff: Re: [mkgmap-dev] java.lang.AssertionError while building index from unicode tiles Hi Gerd In imgfmt/app/srt/Sort.java around line 853: // Get the first non-ignorable at this level int c = chars[pos++ & 0xff]; if (!hasPage(c >>> 8)) { I'm at a loss to understand the 0xff mask! am I missing something? Ticker _______________________________________________ mkgmap-dev mailing list mkgmap-dev@lists.mkgmap.org.uk https://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev