1 extern crate rand;
2
3 use encode::encoded_size;
4 use *;
5
6 use std::str;
7
8 use self::rand::distributions::{Distribution, Uniform};
9 use self::rand::{FromEntropy, Rng};
10 use self::rand::seq::SliceRandom;
11
12 #[test]
roundtrip_random_config_short()13 fn roundtrip_random_config_short() {
14 // exercise the slower encode/decode routines that operate on shorter buffers more vigorously
15 roundtrip_random_config(Uniform::new(0, 50), 10_000);
16 }
17
18 #[test]
roundtrip_random_config_long()19 fn roundtrip_random_config_long() {
20 roundtrip_random_config(Uniform::new(0, 1000), 10_000);
21 }
22
assert_encode_sanity(encoded: &str, config: Config, input_len: usize)23 pub fn assert_encode_sanity(encoded: &str, config: Config, input_len: usize) {
24 let input_rem = input_len % 3;
25 let expected_padding_len = if input_rem > 0 {
26 if config.pad {
27 3 - input_rem
28 } else {
29 0
30 }
31 } else {
32 0
33 };
34
35 let expected_encoded_len = encoded_size(input_len, config).unwrap();
36
37 assert_eq!(expected_encoded_len, encoded.len());
38
39 let padding_len = encoded.chars().filter(|&c| c == '=').count();
40
41 assert_eq!(expected_padding_len, padding_len);
42
43 let _ = str::from_utf8(encoded.as_bytes()).expect("Base64 should be valid utf8");
44 }
45
roundtrip_random_config(input_len_range: Uniform<usize>, iterations: u32)46 fn roundtrip_random_config(input_len_range: Uniform<usize>, iterations: u32) {
47 let mut input_buf: Vec<u8> = Vec::new();
48 let mut encoded_buf = String::new();
49 let mut rng = rand::rngs::SmallRng::from_entropy();
50
51 for _ in 0..iterations {
52 input_buf.clear();
53 encoded_buf.clear();
54
55 let input_len = input_len_range.sample(&mut rng);
56
57 let config = random_config(&mut rng);
58
59 for _ in 0..input_len {
60 input_buf.push(rng.gen());
61 }
62
63 encode_config_buf(&input_buf, config, &mut encoded_buf);
64
65 assert_encode_sanity(&encoded_buf, config, input_len);
66
67 assert_eq!(input_buf, decode_config(&encoded_buf, config).unwrap());
68 }
69 }
70
random_config<R: Rng>(rng: &mut R) -> Config71 pub fn random_config<R: Rng>(rng: &mut R) -> Config {
72 const CHARSETS: &[CharacterSet] = &[
73 CharacterSet::UrlSafe,
74 CharacterSet::Standard,
75 CharacterSet::Crypt,
76 ];
77 let charset = *CHARSETS.choose(rng).unwrap();
78
79 Config::new(charset, rng.gen())
80 }
81