summaryrefslogtreecommitdiff
path: root/rand/src/reseeding.rs
diff options
context:
space:
mode:
Diffstat (limited to 'rand/src/reseeding.rs')
-rw-r--r--rand/src/reseeding.rs229
1 files changed, 0 insertions, 229 deletions
diff --git a/rand/src/reseeding.rs b/rand/src/reseeding.rs
deleted file mode 100644
index 1f24e20..0000000
--- a/rand/src/reseeding.rs
+++ /dev/null
@@ -1,229 +0,0 @@
-// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-//! A wrapper around another RNG that reseeds it after it
-//! generates a certain number of random bytes.
-
-use core::default::Default;
-
-use {Rng, SeedableRng};
-
-/// How many bytes of entropy the underling RNG is allowed to generate
-/// before it is reseeded
-const DEFAULT_GENERATION_THRESHOLD: u64 = 32 * 1024;
-
-/// A wrapper around any RNG which reseeds the underlying RNG after it
-/// has generated a certain number of random bytes.
-#[derive(Debug)]
-pub struct ReseedingRng<R, Rsdr> {
- rng: R,
- generation_threshold: u64,
- bytes_generated: u64,
- /// Controls the behaviour when reseeding the RNG.
- pub reseeder: Rsdr,
-}
-
-impl<R: Rng, Rsdr: Reseeder<R>> ReseedingRng<R, Rsdr> {
- /// Create a new `ReseedingRng` with the given parameters.
- ///
- /// # Arguments
- ///
- /// * `rng`: the random number generator to use.
- /// * `generation_threshold`: the number of bytes of entropy at which to reseed the RNG.
- /// * `reseeder`: the reseeding object to use.
- pub fn new(rng: R, generation_threshold: u64, reseeder: Rsdr) -> ReseedingRng<R,Rsdr> {
- ReseedingRng {
- rng: rng,
- generation_threshold: generation_threshold,
- bytes_generated: 0,
- reseeder: reseeder
- }
- }
-
- /// Reseed the internal RNG if the number of bytes that have been
- /// generated exceed the threshold.
- pub fn reseed_if_necessary(&mut self) {
- if self.bytes_generated >= self.generation_threshold {
- self.reseeder.reseed(&mut self.rng);
- self.bytes_generated = 0;
- }
- }
-}
-
-
-impl<R: Rng, Rsdr: Reseeder<R>> Rng for ReseedingRng<R, Rsdr> {
- fn next_u32(&mut self) -> u32 {
- self.reseed_if_necessary();
- self.bytes_generated += 4;
- self.rng.next_u32()
- }
-
- fn next_u64(&mut self) -> u64 {
- self.reseed_if_necessary();
- self.bytes_generated += 8;
- self.rng.next_u64()
- }
-
- fn fill_bytes(&mut self, dest: &mut [u8]) {
- self.reseed_if_necessary();
- self.bytes_generated += dest.len() as u64;
- self.rng.fill_bytes(dest)
- }
-}
-
-impl<S, R: SeedableRng<S>, Rsdr: Reseeder<R> + Default>
- SeedableRng<(Rsdr, S)> for ReseedingRng<R, Rsdr> {
- fn reseed(&mut self, (rsdr, seed): (Rsdr, S)) {
- self.rng.reseed(seed);
- self.reseeder = rsdr;
- self.bytes_generated = 0;
- }
-
- /// Create a new `ReseedingRng` from the given reseeder and
- /// seed. This uses a default value for `generation_threshold`.
- fn from_seed((rsdr, seed): (Rsdr, S)) -> ReseedingRng<R, Rsdr> {
- ReseedingRng {
- rng: SeedableRng::from_seed(seed),
- generation_threshold: DEFAULT_GENERATION_THRESHOLD,
- bytes_generated: 0,
- reseeder: rsdr
- }
- }
-}
-
-/// Something that can be used to reseed an RNG via `ReseedingRng`.
-///
-/// # Example
-///
-/// ```rust
-/// use rand::{Rng, SeedableRng, StdRng};
-/// use rand::reseeding::{Reseeder, ReseedingRng};
-///
-/// struct TickTockReseeder { tick: bool }
-/// impl Reseeder<StdRng> for TickTockReseeder {
-/// fn reseed(&mut self, rng: &mut StdRng) {
-/// let val = if self.tick {0} else {1};
-/// rng.reseed(&[val]);
-/// self.tick = !self.tick;
-/// }
-/// }
-/// fn main() {
-/// let rsdr = TickTockReseeder { tick: true };
-///
-/// let inner = StdRng::new().unwrap();
-/// let mut rng = ReseedingRng::new(inner, 10, rsdr);
-///
-/// // this will repeat, because it gets reseeded very regularly.
-/// let s: String = rng.gen_ascii_chars().take(100).collect();
-/// println!("{}", s);
-/// }
-///
-/// ```
-pub trait Reseeder<R> {
- /// Reseed the given RNG.
- fn reseed(&mut self, rng: &mut R);
-}
-
-/// Reseed an RNG using a `Default` instance. This reseeds by
-/// replacing the RNG with the result of a `Default::default` call.
-#[derive(Clone, Copy, Debug)]
-pub struct ReseedWithDefault;
-
-impl<R: Rng + Default> Reseeder<R> for ReseedWithDefault {
- fn reseed(&mut self, rng: &mut R) {
- *rng = Default::default();
- }
-}
-impl Default for ReseedWithDefault {
- fn default() -> ReseedWithDefault { ReseedWithDefault }
-}
-
-#[cfg(test)]
-mod test {
- use std::default::Default;
- use std::iter::repeat;
- use super::{ReseedingRng, ReseedWithDefault};
- use {SeedableRng, Rng};
-
- struct Counter {
- i: u32
- }
-
- impl Rng for Counter {
- fn next_u32(&mut self) -> u32 {
- self.i += 1;
- // very random
- self.i - 1
- }
- }
- impl Default for Counter {
- fn default() -> Counter {
- Counter { i: 0 }
- }
- }
- impl SeedableRng<u32> for Counter {
- fn reseed(&mut self, seed: u32) {
- self.i = seed;
- }
- fn from_seed(seed: u32) -> Counter {
- Counter { i: seed }
- }
- }
- type MyRng = ReseedingRng<Counter, ReseedWithDefault>;
-
- #[test]
- fn test_reseeding() {
- let mut rs = ReseedingRng::new(Counter {i:0}, 400, ReseedWithDefault);
-
- let mut i = 0;
- for _ in 0..1000 {
- assert_eq!(rs.next_u32(), i % 100);
- i += 1;
- }
- }
-
- #[test]
- fn test_rng_seeded() {
- let mut ra: MyRng = SeedableRng::from_seed((ReseedWithDefault, 2));
- let mut rb: MyRng = SeedableRng::from_seed((ReseedWithDefault, 2));
- assert!(::test::iter_eq(ra.gen_ascii_chars().take(100),
- rb.gen_ascii_chars().take(100)));
- }
-
- #[test]
- fn test_rng_reseed() {
- let mut r: MyRng = SeedableRng::from_seed((ReseedWithDefault, 3));
- let string1: String = r.gen_ascii_chars().take(100).collect();
-
- r.reseed((ReseedWithDefault, 3));
-
- let string2: String = r.gen_ascii_chars().take(100).collect();
- assert_eq!(string1, string2);
- }
-
- const FILL_BYTES_V_LEN: usize = 13579;
- #[test]
- fn test_rng_fill_bytes() {
- let mut v = repeat(0u8).take(FILL_BYTES_V_LEN).collect::<Vec<_>>();
- ::test::rng().fill_bytes(&mut v);
-
- // Sanity test: if we've gotten here, `fill_bytes` has not infinitely
- // recursed.
- assert_eq!(v.len(), FILL_BYTES_V_LEN);
-
- // To test that `fill_bytes` actually did something, check that the
- // average of `v` is not 0.
- let mut sum = 0.0;
- for &x in v.iter() {
- sum += x as f64;
- }
- assert!(sum / v.len() as f64 != 0.0);
- }
-}