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DEFINE
shl == 2 *;
shr == 2 /;
and63 == dup 64 / 64 * -;
b64enc1 == ord 16 [shl] times [ord 8 [shl] times] dip + [ord] dip +;
shrat == [shr] times and63 at;
b64enc2 == ["ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" swap] [
# [18 12 6 0 ] [[shrat] cons] map crashes
[18 shrat]
[12 shrat]
[6 shrat]
[0 shrat]
] construct "" 4 [cons] times popd;
s2l == [null] [pop []] [uncons] [cons] linrec;
b64enc ==
s2l
"" swap
dup size 3 rem 3 swap - 3 rem
[0 chr [] cons concat] times
dup size 3 /
[dup 3 take s2l [b64enc1 b64enc2] infra first rollup [swap concat] dip 3 drop] times
pop
"\n" concat;
END
stdin [feof not] [fgets b64enc putchars] while fclose.
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