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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 encode(&self, s: &str) -> String {
  9.         let mut bs: Vec<bool> = s.as_bytes().iter()
  10.             .flat_map(|b| (0..8).map(move |i| b >> (7 - i) & 1u8 != 0u8)).collect();
  11.         for _ in 0..6 - bs.len() % 6 {bs.push(false)}
  12.         let mut cs: Vec<char> = bs.chunks(6)
  13.             .map(|b6| b6.iter().enumerate().fold(0, |acc, (i, b)| acc + ((*b as u8) << (5 - i))))
  14.             .map(|u| self.table[u as usize]).collect();
  15.         for _ in 0..4 - cs.len() % 4 {cs.push('=')}
  16.         cs.into_iter().collect()
  17.     }
  18.     fn decode(&self, s: &str) -> String {
  19.         let mut bs: Vec<bool> = s.chars().take_while(|d| *d != '=')
  20.             .flat_map(|c| self.table.iter().position(|e| *e == c))
  21.             .flat_map(|b| (0..6).map(move |i| b as u8 >> (5 - i) & 1u8 != 0u8)).collect();
  22.         let newlen = bs.len() - bs.len() % 8;
  23.         bs.truncate(newlen);
  24.         let us: Vec<u8> = bs.chunks(8)
  25.             .map(|b8| b8.iter().enumerate().fold(0, |acc, (i, b)| acc + ((*b as u8) << (7 - i))))
  26.             .collect();
  27.         String::from_utf8(us).unwrap_or(String::new())
  28.     }
  29. }
  30. fn main() {
  31.     let b64 = B64::new();
  32.     let p = |s| {
  33.         let e = b64.encode(s);
  34.         let d = b64.decode(e.as_str());
  35.         println!("{}\n{}\n{}\n", s, e, d);
  36.     };
  37.     p("ABCDEFG");
  38.     p("Hello, World!");
  39.     p("0123456789\"#$%&'()`=@");
  40.     p("💖");
  41. }
  42.  
Success #stdin #stdout 0s 14872KB
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/vZk4Oh
language:
Rust (rust 1.56)
created:
8 years ago
visibility:
public

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