base64decode      301 nkf.c          static  int     base64decode PROTO((int c));
base64decode     2840 nkf.c              t1 = 0x3f & base64decode(c1);
base64decode     2841 nkf.c              t2 = 0x3f & base64decode(c2);
base64decode     2842 nkf.c              t3 = 0x3f & base64decode(c3);
base64decode     2843 nkf.c              t4 = 0x3f & base64decode(c4);