RosettaCodeData/Task/URL-decoding/Ada/url-decoding-3.ada

29 lines
855 B
Ada

package body URL is
function Decode (URL : in String) return String is
Buffer : String (1 .. URL'Length);
Filled : Natural := 0;
Position : Positive := URL'First;
begin
while Position in URL'Range loop
Filled := Filled + 1;
case URL (Position) is
when '+' =>
Buffer (Filled) := ' ';
Position := Position + 1;
when '%' =>
Buffer (Filled) :=
Character'Val
(Natural'Value
("16#" & URL (Position + 1 .. Position + 2) & "#"));
Position := Position + 3;
when others =>
Buffer (Filled) := URL (Position);
Position := Position + 1;
end case;
end loop;
return Buffer (1 .. Filled);
end Decode;
end URL;