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DEFINE
shl == 2 *;
shr == 2 /;
and63 == [64 / 64 *] nullary -;
b64enc1 == ord 16 [shl] times [ord 8 [shl] times] dip + [ord] dip +;
b64enc2 == "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" swap [] [
[18 [shr] times and63 at]
[12 [shr] times and63 at]
[6 [shr] times and63 at]
[and63 at]
] construct "" cons cons cons cons [pop] dip;
s2l == [null] [pop []] [uncons] [cons] linrec;
b64enc ==
s2l
"" swap
# pad with null bytes
# calculate how many bytes to pad
[size 3 rem 3 swap - 3 rem] nullary
# i cant use null bytes in strings (hence s2l)
[0 chr [] cons concat] times
# len(s)/3 times
[size 3 /] nullary
[[3 take] nullary s2l [b64enc1 b64enc2] infra first rollup [swap concat] dip 3 drop] times
# remove the now-empty string
pop
"\n" concat
END
stdin [feof not] [fgets b64enc putchars] while fclose.
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