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  1. struct B64 {
  2.     table: Vec<char>,
  3. }
  4. impl B64 {
  5.     fn new() -> B64 {
  6.         B64{table: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".chars().collect()}
  7.     }
  8.     fn _push(bs: &mut Vec<bool>, byte: u8, width: i32) {
  9.         for i in 0..width {bs.push(byte >> (width - 1 - i) & 1 != 0);}
  10.     }
  11.     fn encode(&self, s: &str) -> String {
  12.         let mut bs: Vec<bool> = Vec::new();
  13.         for b in s.as_bytes() {B64::_push(&mut bs, *b, 8)}
  14.         for _ in 0..6 - bs.len() % 6 {bs.push(false)}
  15.         let mut cs: Vec<char> = bs.chunks(6)
  16.             .map(|b6| b6.iter().enumerate().fold(0, |acc, (i, b)| acc + ((*b as u8) << (5 - i))))
  17.             .map(|u| self.table[u as usize]).collect();
  18.         for _ in 0..4 - cs.len() % 4 {cs.push('=')}
  19.         cs.into_iter().collect()
  20.     }
  21.     fn decode(&self, s: &str) -> String {
  22.         let mut bs: Vec<bool> = Vec::new();
  23.         for c in s.chars().take_while(|d| *d != '=') {
  24.             if let Some(i) = self.table.iter().position(|e| *e == c) {B64::_push(&mut bs, i as u8, 6)}
  25.         }
  26.         let newlen = bs.len() - bs.len() % 8;
  27.         bs.truncate(newlen);
  28.         let us: Vec<u8> = bs.chunks(8)
  29.             .map(|b8| b8.iter().enumerate().fold(0, |acc, (i, b)| acc + ((*b as u8) << (7 - i))))
  30.             .collect();
  31.         String::from_utf8(us).unwrap_or(String::new())
  32.     }
  33. }
  34. fn main() {
  35.     let b64 = B64::new();
  36.     let p = |s| {
  37.         let e = b64.encode(s);
  38.         let d = b64.decode(e.as_str());
  39.         println!("{}\n{}\n{}\n", s, e, d);
  40.     };
  41.     p("ABCDEFG");
  42.     p("Hello, World!");
  43.     p("0123456789\"#$%&'()`=@");
  44.     p("💖");
  45. }
  46.  
Success #stdin #stdout 0s 4496KB
comments (?)
stdin
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Standard input is empty
stdout
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ABCDEFG
QUJDREVGRw==
ABCDEFG

Hello, World!
SGVsbG8sIFdvcmxkIQ==
Hello, World!

0123456789"#$%&'()`=@
MDEyMzQ1Njc4OSIjJCUmJygpYD1AA===
0123456789"#$%&'()`=@

💖
8J+Slg==
💖
https://ideone.com/2Ax53r
language:
Rust (rust 1.56)
created:
8 years ago
visibility:
public

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