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pub extern crate base64;
pub fn encode<T: ?Sized + AsRef<[u8]>>(input: &T) -> String {
base64::encode_config(input, base64::URL_SAFE_NO_PAD)
}
pub fn encode_and_push_to_string<T: ?Sized + AsRef<[u8]>>(input: &T, output: String) -> String {
let bytes = input.as_ref();
let mut buffer = output.into_bytes();
let current_len = buffer.len();
let base64_len = ((bytes.len() * 4 / 3) + 3) / 4 * 4;
let min_capacity = current_len + base64_len;
let capacity = buffer.capacity();
if capacity < min_capacity {
buffer.reserve(min_capacity - capacity);
}
unsafe {
buffer.set_len(min_capacity);
}
let base64_len = base64::encode_config_slice(bytes, base64::URL_SAFE_NO_PAD, &mut buffer[current_len..min_capacity]);
unsafe {
buffer.set_len(current_len + base64_len);
}
String::from_utf8(buffer).unwrap()
}
pub fn decode<T: ?Sized + AsRef<[u8]>>(input: &T) -> Result<Vec<u8>, base64::DecodeError> {
base64::decode_config(input, base64::URL_SAFE_NO_PAD)
}
pub fn decode_and_push_to_vec<T: ?Sized + AsRef<[u8]>>(input: &T, mut output: Vec<u8>) -> Result<Vec<u8>, base64::DecodeError> {
let bytes = input.as_ref();
let current_len = output.len();
let original_max_len = {
let len = bytes.len();
(len + 3 / 4) * 3
};
let min_capacity = current_len + original_max_len;
let capacity = output.capacity();
if capacity < min_capacity {
output.reserve(min_capacity - capacity);
}
unsafe {
output.set_len(min_capacity);
}
let original_len = base64::decode_config_slice(bytes, base64::URL_SAFE_NO_PAD, &mut output[current_len..min_capacity])?;
unsafe {
output.set_len(current_len + original_len);
}
Ok(output)
}
pub fn unsafe_escape(base64_str: &str) -> String {
let mut result = Vec::with_capacity(base64_str.len());
for &n in base64_str.as_bytes() {
if n == 43 {
result.push(45);
} else if n == 47 {
result.push(95);
} else if n == 61 {
break;
} else {
result.push(n);
}
}
String::from_utf8(result).unwrap()
}
pub fn unsafe_escape_owned(base64_str: String) -> String {
let mut result = base64_str.into_bytes();
let mut len = result.len();
for (index, n) in result.iter_mut().enumerate() {
match *n {
43 => *n = 45,
47 => *n = 95,
61 => { len = index; }
_ => ()
}
}
unsafe {
result.set_len(len);
}
String::from_utf8(result).unwrap()
}
pub fn unsafe_unescape(base64_str: &str) -> String {
let len = base64_str.len();
let mut result = Vec::with_capacity(((len * 4 / 3) + 3) / 4 * 4);
for &n in base64_str.as_bytes() {
if n == 45 {
result.push(43);
} else if n == 95 {
result.push(47);
} else {
result.push(n);
}
}
let padding = len % 4;
if padding > 0 {
for _ in padding..4 {
result.push(61);
}
}
String::from_utf8(result).unwrap()
}
pub fn unsafe_unescape_owned(base64_str: String) -> String {
let mut result = base64_str.into_bytes();
for n in result.iter_mut() {
match *n {
45 => *n = 43,
95 => *n = 47,
_ => ()
}
}
let padding = result.len() % 4;
if padding > 0 {
for _ in padding..4 {
result.push(61);
}
}
String::from_utf8(result).unwrap()
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_encode() {
assert_eq!("aHR0cHM6Ly9tYWdpY2xlbi5vcmc", encode("https://magiclen.org"));
}
#[test]
fn test_encode_and_push_to_string() {
let url = "https://magiclen.org/".to_string();
assert_eq!("https://magiclen.org/YXJ0aWNsZXM", encode_and_push_to_string("articles", url));
}
#[test]
fn test_decode() {
assert_eq!("https://magiclen.org".as_bytes().to_vec(), decode("aHR0cHM6Ly9tYWdpY2xlbi5vcmc").unwrap());
}
#[test]
fn test_decode_and_push_to_vec() {
let url = "https://magiclen.org/".as_bytes().to_vec();
assert_eq!("https://magiclen.org/articles".as_bytes().to_vec(), decode_and_push_to_vec("YXJ0aWNsZXM", url).unwrap());
}
#[test]
fn test_unsafe_escape() {
assert_eq!("aHR0cHM6Ly9tYWdpY2xlbi5vcmc", unsafe_escape(&base64::encode("https://magiclen.org")));
}
#[test]
fn test_unsafe_escape_owned() {
assert_eq!("aHR0cHM6Ly9tYWdpY2xlbi5vcmc", unsafe_escape_owned(base64::encode("https://magiclen.org")));
}
#[test]
fn test_unsafe_unescape() {
assert_eq!("https://magiclen.org".as_bytes().to_vec(), base64::decode(&unsafe_unescape("aHR0cHM6Ly9tYWdpY2xlbi5vcmc")).unwrap());
}
#[test]
fn test_unsafe_unescape_owned() {
assert_eq!("https://magiclen.org".as_bytes().to_vec(), base64::decode(&unsafe_unescape_owned("aHR0cHM6Ly9tYWdpY2xlbi5vcmc".to_string())).unwrap());
}
}