const char hex_tab[16] = { '0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f' };
const char HEX_tab[16] = { '0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F' };
const char hex_tab[16] = { '0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f' };
const char HEX_tab[16] = { '0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F' };