On Friday, 8 November 2019 at 11:46:44 UTC, Marcone wrote:
I can encode "Helo World!" to Base64 and get "TWFyY29uZQ==",
but if I try to decode "TWFyY29uZQ==" I can not recovery "Helo
World!" but [77, 97, 114, 99, 111, 110, 101]. How can I recover
"Helo World!" when decode? Thank you.
import std;
void main(){
string text = "Helo World!";
auto encoded = Base64.encode(text.representation);
auto decoded = Base64URL.decode("TWFyY29uZQ==");
writeln(encoded); // prints: "TWFyY29uZQ=="
writeln(to!string(decoded)); // prints: [77, 97, 114, 99, 111,
110, 101] but I want to print: "Helo World!"
}
What Aldo said - Base64 operates on ubyte[], which a string is
not (it's immutable(char)[]). There's also assumeUTF
(https://dlang.org/library/std/string/assume_utf.html) which may
document your code a bit better than a simple cast, but it does
the same thing inside.
The reason Base64 operates on ubyte[] is to be able to encode
arbitrary data, while the reason to!string doesn't convert your
ubyte[] to a readable string is that not all ubyte[] are valid
strings, and displaying arbitrary data as if it were a string is
sure to cause problems.
--
Simen
