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// Copyright 2018 Developers of the Rand project.
// Copyright 2017-2018 The Rust Project Developers.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! ISAAC helper functions for 256-element arrays.
// Terrible workaround because arrays with more than 32 elements do not
// implement `AsRef`, `Default`, `Serialize`, `Deserialize`, or any other
// traits for that matter.
#[cfg(feature="serde")] use serde::{Serialize, Deserialize};
const RAND_SIZE_LEN: usize = 8;
const RAND_SIZE: usize = 1 << RAND_SIZE_LEN;
#[derive(Copy, Clone)]
#[allow(missing_debug_implementations)]
#[cfg_attr(feature="serde", derive(Serialize, Deserialize))]
pub struct IsaacArray<T> {
#[cfg_attr(feature="serde",serde(with="isaac_array_serde"))]
#[cfg_attr(feature="serde", serde(bound(
serialize = "T: Serialize",
deserialize = "T: Deserialize<'de> + Copy + Default")))]
inner: [T; RAND_SIZE]
}
impl<T> ::core::convert::AsRef<[T]> for IsaacArray<T> {
#[inline(always)]
fn as_ref(&self) -> &[T] {
&self.inner[..]
}
}
impl<T> ::core::convert::AsMut<[T]> for IsaacArray<T> {
#[inline(always)]
fn as_mut(&mut self) -> &mut [T] {
&mut self.inner[..]
}
}
impl<T> ::core::ops::Deref for IsaacArray<T> {
type Target = [T; RAND_SIZE];
#[inline(always)]
fn deref(&self) -> &Self::Target {
&self.inner
}
}
impl<T> ::core::ops::DerefMut for IsaacArray<T> {
#[inline(always)]
fn deref_mut(&mut self) -> &mut [T; RAND_SIZE] {
&mut self.inner
}
}
impl<T> ::core::default::Default for IsaacArray<T> where T: Copy + Default {
fn default() -> IsaacArray<T> {
IsaacArray { inner: [T::default(); RAND_SIZE] }
}
}
#[cfg(feature="serde")]
pub(super) mod isaac_array_serde {
const RAND_SIZE_LEN: usize = 8;
const RAND_SIZE: usize = 1 << RAND_SIZE_LEN;
use serde::{Deserialize, Deserializer, Serialize, Serializer};
use serde::de::{Visitor,SeqAccess};
use serde::de;
use core::fmt;
pub fn serialize<T, S>(arr: &[T;RAND_SIZE], ser: S) -> Result<S::Ok, S::Error>
where
T: Serialize,
S: Serializer
{
use serde::ser::SerializeTuple;
let mut seq = ser.serialize_tuple(RAND_SIZE)?;
for e in arr.iter() {
seq.serialize_element(&e)?;
}
seq.end()
}
#[inline]
pub fn deserialize<'de, T, D>(de: D) -> Result<[T;RAND_SIZE], D::Error>
where
T: Deserialize<'de>+Default+Copy,
D: Deserializer<'de>,
{
use core::marker::PhantomData;
struct ArrayVisitor<T> {
_pd: PhantomData<T>,
};
impl<'de,T> Visitor<'de> for ArrayVisitor<T>
where
T: Deserialize<'de>+Default+Copy
{
type Value = [T; RAND_SIZE];
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("Isaac state array")
}
#[inline]
fn visit_seq<A>(self, mut seq: A) -> Result<[T; RAND_SIZE], A::Error>
where
A: SeqAccess<'de>,
{
let mut out = [Default::default();RAND_SIZE];
for i in 0..RAND_SIZE {
match seq.next_element()? {
Some(val) => out[i] = val,
None => return Err(de::Error::invalid_length(i, &self)),
};
}
Ok(out)
}
}
de.deserialize_tuple(RAND_SIZE, ArrayVisitor{_pd: PhantomData})
}
}
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