use crate::rng::AxRng;
impl AxRng {
pub fn next_alphanumeric(&mut self, len: usize) -> String {
const CHARSET: &[u8; 62] =
b"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
let mut result = String::with_capacity(len);
let chars_per_batch = 5;
let batches = len / chars_per_batch;
let remainder = len % chars_per_batch;
for _ in 0..batches {
let v = self.next_u64();
let mut x = v;
for _ in 0..chars_per_batch {
let idx = (x % 62) as usize;
result.push(CHARSET[idx] as char);
x /= 62;
}
}
if remainder > 0 {
let v = self.next_u64();
let mut x = v;
for _ in 0..remainder {
let idx = (x % 62) as usize;
result.push(CHARSET[idx] as char);
x /= 62;
}
}
result
}
pub fn next_base64url(&mut self, len: usize) -> String {
const CHARSET: &[u8; 64] =
b"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
let mut result = String::with_capacity(len);
let chars_per_batch = 5;
let batches = len / chars_per_batch;
let remainder = len % chars_per_batch;
for _ in 0..batches {
let v = self.next_u64();
let mut x = v;
for _ in 0..chars_per_batch {
let idx = (x % 64) as usize;
result.push(CHARSET[idx] as char);
x /= 64;
}
}
if remainder > 0 {
let v = self.next_u64();
let mut x = v;
for _ in 0..remainder {
let idx = (x % 64) as usize;
result.push(CHARSET[idx] as char);
x /= 64;
}
}
result
}
pub fn alpha(&mut self, len: usize) -> String {
self.next_alphanumeric(len)
}
pub fn token(&mut self, len: usize) -> String {
self.next_base64url(len)
}
}