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extern crate base64;
extern crate rand;
use rand::{FromEntropy, Rng};
use base64::*;
mod helpers;
use self::helpers::*;
// generate random contents of the specified length and test encode/decode roundtrip
fn roundtrip_random(
byte_buf: &mut Vec<u8>,
str_buf: &mut String,
config: Config,
byte_len: usize,
approx_values_per_byte: u8,
max_rounds: u64,
) {
// let the short ones be short but don't let it get too crazy large
let num_rounds = calculate_number_of_rounds(byte_len, approx_values_per_byte, max_rounds);
let mut r = rand::rngs::SmallRng::from_entropy();
let mut decode_buf = Vec::new();
for _ in 0..num_rounds {
byte_buf.clear();
str_buf.clear();
decode_buf.clear();
while byte_buf.len() < byte_len {
byte_buf.push(r.gen::<u8>());
}
encode_config_buf(&byte_buf, config, str_buf);
decode_config_buf(&str_buf, config, &mut decode_buf).unwrap();
assert_eq!(byte_buf, &decode_buf);
}
}
fn calculate_number_of_rounds(byte_len: usize, approx_values_per_byte: u8, max: u64) -> u64 {
// don't overflow
let mut prod = approx_values_per_byte as u64;
for _ in 0..byte_len {
if prod > max {
return max;
}
prod = prod.saturating_mul(prod);
}
prod
}
fn no_pad_config() -> Config {
Config::new(CharacterSet::Standard, false)
}
#[test]
fn roundtrip_random_short_standard() {
let mut byte_buf: Vec<u8> = Vec::new();
let mut str_buf = String::new();
for input_len in 0..40 {
roundtrip_random(&mut byte_buf, &mut str_buf, STANDARD, input_len, 4, 10000);
}
}
#[test]
fn roundtrip_random_with_fast_loop_standard() {
let mut byte_buf: Vec<u8> = Vec::new();
let mut str_buf = String::new();
for input_len in 40..100 {
roundtrip_random(&mut byte_buf, &mut str_buf, STANDARD, input_len, 4, 1000);
}
}
#[test]
fn roundtrip_random_short_no_padding() {
let mut byte_buf: Vec<u8> = Vec::new();
let mut str_buf = String::new();
for input_len in 0..40 {
roundtrip_random(
&mut byte_buf,
&mut str_buf,
no_pad_config(),
input_len,
4,
10000,
);
}
}
#[test]
fn roundtrip_random_no_padding() {
let mut byte_buf: Vec<u8> = Vec::new();
let mut str_buf = String::new();
for input_len in 40..100 {
roundtrip_random(
&mut byte_buf,
&mut str_buf,
no_pad_config(),
input_len,
4,
1000,
);
}
}
#[test]
fn roundtrip_decode_trailing_10_bytes() {
// This is a special case because we decode 8 byte blocks of input at a time as much as we can,
// ideally unrolled to 32 bytes at a time, in stages 1 and 2. Since we also write a u64's worth
// of bytes (8) to the output, we always write 2 garbage bytes that then will be overwritten by
// the NEXT block. However, if the next block only contains 2 bytes, it will decode to 1 byte,
// and therefore be too short to cover up the trailing 2 garbage bytes. Thus, we have stage 3
// to handle that case.
for num_quads in 0..25 {
let mut s: String = std::iter::repeat("ABCD").take(num_quads).collect();
s.push_str("EFGHIJKLZg");
let decoded = decode(&s).unwrap();
assert_eq!(num_quads * 3 + 7, decoded.len());
assert_eq!(s, encode_config(&decoded, STANDARD_NO_PAD));
}
}
#[test]
fn display_wrapper_matches_normal_encode() {
let mut bytes = Vec::<u8>::with_capacity(256);
for i in 0..255 {
bytes.push(i);
}
bytes.push(255);
assert_eq!(
encode(&bytes),
format!(
"{}",
base64::display::Base64Display::with_config(&bytes, STANDARD)
)
);
}
#[test]
fn because_we_can() {
compare_decode("alice", "YWxpY2U=");
compare_decode("alice", &encode(b"alice"));
compare_decode("alice", &encode(&decode(&encode(b"alice")).unwrap()));
}
#[test]
fn encode_config_slice_can_use_inline_buffer() {
let mut buf: [u8; 22] = [0; 22];
let mut larger_buf: [u8; 24] = [0; 24];
let mut input: [u8; 16] = [0; 16];
let mut rng = rand::rngs::SmallRng::from_entropy();
for elt in &mut input {
*elt = rng.gen();
}
assert_eq!(22, encode_config_slice(&input, STANDARD_NO_PAD, &mut buf));
let decoded = decode_config(&buf, STANDARD_NO_PAD).unwrap();
assert_eq!(decoded, input);
// let's try it again with padding
assert_eq!(24, encode_config_slice(&input, STANDARD, &mut larger_buf));
let decoded = decode_config(&buf, STANDARD).unwrap();
assert_eq!(decoded, input);
}
#[test]
#[should_panic(expected = "index 24 out of range for slice of length 22")]
fn encode_config_slice_panics_when_buffer_too_small() {
let mut buf: [u8; 22] = [0; 22];
let mut input: [u8; 16] = [0; 16];
let mut rng = rand::rngs::SmallRng::from_entropy();
for elt in &mut input {
*elt = rng.gen();
}
encode_config_slice(&input, STANDARD, &mut buf);
}
|
