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use crate::{decode_config, encode::encoded_size, encode_config_buf, CharacterSet, Config};
use std::str;
use rand::{
distributions::{Distribution, Uniform},
seq::SliceRandom,
FromEntropy, Rng,
};
#[test]
fn roundtrip_random_config_short() {
// exercise the slower encode/decode routines that operate on shorter buffers more vigorously
roundtrip_random_config(Uniform::new(0, 50), 10_000);
}
#[test]
fn roundtrip_random_config_long() {
roundtrip_random_config(Uniform::new(0, 1000), 10_000);
}
pub fn assert_encode_sanity(encoded: &str, config: Config, input_len: usize) {
let input_rem = input_len % 3;
let expected_padding_len = if input_rem > 0 {
if config.pad {
3 - input_rem
} else {
0
}
} else {
0
};
let expected_encoded_len = encoded_size(input_len, config).unwrap();
assert_eq!(expected_encoded_len, encoded.len());
let padding_len = encoded.chars().filter(|&c| c == '=').count();
assert_eq!(expected_padding_len, padding_len);
let _ = str::from_utf8(encoded.as_bytes()).expect("Base64 should be valid utf8");
}
fn roundtrip_random_config(input_len_range: Uniform<usize>, iterations: u32) {
let mut input_buf: Vec<u8> = Vec::new();
let mut encoded_buf = String::new();
let mut rng = rand::rngs::SmallRng::from_entropy();
for _ in 0..iterations {
input_buf.clear();
encoded_buf.clear();
let input_len = input_len_range.sample(&mut rng);
let config = random_config(&mut rng);
for _ in 0..input_len {
input_buf.push(rng.gen());
}
encode_config_buf(&input_buf, config, &mut encoded_buf);
assert_encode_sanity(&encoded_buf, config, input_len);
assert_eq!(input_buf, decode_config(&encoded_buf, config).unwrap());
}
}
pub fn random_config<R: Rng>(rng: &mut R) -> Config {
const CHARSETS: &[CharacterSet] = &[
CharacterSet::UrlSafe,
CharacterSet::Standard,
CharacterSet::Crypt,
CharacterSet::ImapMutf7,
CharacterSet::BinHex,
];
let charset = *CHARSETS.choose(rng).unwrap();
Config::new(charset, rng.gen())
}
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