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// Copyright 2022 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//! Helper functions around `rand`'s offerings for convenient test usage.
#![no_std]
#![forbid(unsafe_code)]
#![deny(missing_docs)]
extern crate alloc;
use alloc::vec::Vec;
use log::info;
pub use rand;
use rand::{Rng as _, SeedableRng as _};
/// Returns a random vec with the provided length.
pub fn random_vec<R: rand::Rng>(rng: &mut R, len: usize) -> Vec<u8> {
let mut bytes = Vec::<u8>::new();
bytes.extend((0..len).into_iter().map(|_| rng.gen::<u8>()));
bytes
}
/// Returns a random array with the provided length.
pub fn random_bytes<const B: usize, R: rand::Rng>(rng: &mut R) -> [u8; B] {
let mut bytes = [0; B];
rng.fill(bytes.as_mut_slice());
bytes
}
/// Returns a fast rng seeded with the thread rng (which is itself seeded from the OS).
pub fn seeded_rng() -> impl rand::Rng {
let mut seed: <rand_pcg::Pcg64 as rand::SeedableRng>::Seed = Default::default();
rand::thread_rng().fill(&mut seed);
// print it out so if a test fails, the seed will be visible for further investigation
info!("seed: {:?}", seed);
rand_pcg::Pcg64::from_seed(seed)
}
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