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Drop unsafe code from next_u64 #963

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merged 1 commit into from Apr 6, 2020
Merged

Drop unsafe code from next_u64 #963

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14 changes: 3 additions & 11 deletions rand_core/src/block.rs
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Expand Up @@ -53,7 +53,7 @@
use crate::impls::{fill_via_u32_chunks, fill_via_u64_chunks};
use crate::{CryptoRng, Error, RngCore, SeedableRng};
use core::convert::AsRef;
use core::{fmt, ptr};
use core::fmt;
#[cfg(feature = "serde1")] use serde::{Deserialize, Serialize};

/// A trait for RNGs which do not generate random numbers individually, but in
Expand Down Expand Up @@ -186,16 +186,8 @@ where <R as BlockRngCore>::Results: AsRef<[u32]> + AsMut<[u32]>
#[inline]
fn next_u64(&mut self) -> u64 {
let read_u64 = |results: &[u32], index| {
if cfg!(any(target_endian = "little")) {
// requires little-endian CPU
#[allow(clippy::cast_ptr_alignment)] // false positive
let ptr: *const u64 = results[index..=index+1].as_ptr() as *const u64;
unsafe { ptr::read_unaligned(ptr) }
} else {
let x = u64::from(results[index]);
let y = u64::from(results[index + 1]);
(y << 32) | x
}
let data = &results[index..=index + 1];
u64::from(data[1]) << 32 | u64::from(data[0])
};

let len = self.results.as_ref().len();
Expand Down