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  1. use std::io::{Read, BufReader, Result};
  2.  
  3. struct Rot13<R: Read> {
  4.     r: R,
  5. }
  6.  
  7. impl<R: Read> Rot13<R> {
  8.     fn new(r: R) -> Rot13<R> {
  9.         Rot13{
  10.             r: r,
  11.         }
  12.     }
  13. }
  14.  
  15. impl<R: Read> Read for Rot13<R> {
  16.     fn read(&mut self, buf: &mut [u8]) -> Result<usize> {
  17.         let r = match self.r.read(buf) {
  18.             Ok(r) => r,
  19.             Err(err) => {
  20.                 return Err(err);
  21.             }
  22.         };
  23.  
  24.         for i in 0..buf.len() {
  25.             let c = buf[i] as char;
  26.             if (c >= 'A') && (c <= 'Z') {
  27.                 buf[i] = rotate(buf[i], 'Z' as u8);
  28.             }
  29.             else if (c >= 'a') && (c <= 'z') {
  30.                 buf[i] = rotate(buf[i], 'z' as u8);
  31.             }
  32.         }
  33.  
  34.         Ok(r)
  35.     }
  36. }
  37.  
  38. fn rotate(mut c: u8, max: u8) -> u8 {
  39.     c += 13;
  40.     if c > max {
  41.         c -= 26;
  42.     }
  43.  
  44.     c
  45. }
  46.  
  47. fn main() {
  48.     let mut r = Rot13::new(BufReader::new("Pna V unir fbzr pnxr, cyrnfr?".as_bytes()));
  49.  
  50.     let mut s = String::new();
  51.     r.read_to_string(&mut s).unwrap();
  52.     println!("{}", s);
  53. }
Success #stdin #stdout 0.01s 11080KB
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Can I have some cake, please?
https://ideone.com/5IDa33
language:
Rust (rust 1.56)
created:
10 years ago
visibility:
public

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