"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
nth ; inline
+ERROR: malformed-base64 ;
+
: base64>ch ( ch -- ch )
{
f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f
f 0 f f f 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
22 23 24 25 f f f f f f 26 27 28 29 30 31 32 33 34 35 36 37 38 39
40 41 42 43 44 45 46 47 48 49 50 51
- } nth ; inline
+ } nth [ malformed-base64 ] unless* ; inline
SYMBOL: column
[ 3 0 pad-tail binary [ encode3 ] with-byte-writer ]
[ 1+ ] bi* head-slice 4 CHAR: = pad-tail write-lines ; inline
-ERROR: malformed-base64 ;
-
: decode4 ( seq -- )
[ 0 [ base64>ch swap 6 shift bitor ] reduce 3 >be ]
[ [ CHAR: = = ] count ] bi head-slice*