create buffer 32000 allot

{{
  create bit 5 allot
  : extract  ( $c-$a ) drop @+ bit ! @+ bit 1+ ! bit ;
  : render   ( $c-$n )
    dup '+ = [ drop 32 ] ifTrue
    dup 13 = [ drop 32 ] ifTrue
    dup 10 = [ drop 32 ] ifTrue
    dup '% = [ extract hex toNumber decimal ] ifTrue ;
  : <decode> (  $-$  ) repeat @+ 0; render ^buffer'add again ;
---reveal---
  : decode   (  $-   ) buffer ^buffer'set <decode> drop ;
}}

"http%3A%2F%2Ffoo%20bar%2F" decode buffer puts