Hi Ticker, yes, I'm close to done with the display tool being able to decode the string from Adria Topo. The 'F' is causing trouble, so probably something in my tree is still wrong or incomplete: Here's my actual code to dill the Huffman tree: add("111", 'A'); add("0111", '\0'); add("1000", ' '); add("1001", 'E'); add("1010", 'N'); add("1011", 'O'); add("1100", 'I'); add("1101", 'R'); add("01100", 'K'); add("00101", 'C'); add("00110", 'S'); add("00111", 'D'); add("01000", 'T'); add("01001", 'M'); add("01010", 'V'); add("01011", 'J'); add("01101", 'L'); add("000101", 'G'); add("000110", 'Z'); add("001000", 'P'); add("000111", 'U'); add("001001", 'B'); // add("0000000", 'F'); add("0000110", 'H'); add("0000111", '1'); add("0001001", '.'); add("00000011", '5'); add("00000100", '6'); add("00000111", '7'); add("00001000", '8'); add("00001001", '9'); add("00001010", '0'); add("00001011", '4'); add("00000101", '-'); add("000000100", '('); add("000000101", ')'); Gerd ________________________________________ Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von Ticker Berkin <rwb-mkgmap@jagit.co.uk> Gesendet: Dienstag, 14. Dezember 2021 18:09 An: Development list for mkgmap Betreff: Re: [mkgmap-dev] [mkgmap-svn] Commit r572: MDR16 is some kind of codebook. Hi Gerd Just got back to looking for some more. In addition I have: 000 (space) B 001001 D 00111 I 11001 P 001000 U 000111 V 01010 but you've probably got much further anyway Thinking of various algos to represent the tree and considering what they would make of the example Mdr16 data I haven't got anywhere. Ticker _______________________________________________ mkgmap-dev mailing list mkgmap-dev@lists.mkgmap.org.uk https://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev