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Diffstat (limited to 'vendor/rand_core/src/le.rs')
-rw-r--r-- | vendor/rand_core/src/le.rs | 68 |
1 files changed, 0 insertions, 68 deletions
diff --git a/vendor/rand_core/src/le.rs b/vendor/rand_core/src/le.rs deleted file mode 100644 index 266651f..0000000 --- a/vendor/rand_core/src/le.rs +++ /dev/null @@ -1,68 +0,0 @@ -// Copyright 2018 Developers of the Rand project. -// -// 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. - -//! Little-Endian utilities -//! -//! Little-Endian order has been chosen for internal usage; this makes some -//! useful functions available. - -use core::ptr; - -macro_rules! read_slice { - ($src:expr, $dst:expr, $size:expr, $which:ident) => {{ - assert_eq!($src.len(), $size * $dst.len()); - - unsafe { - ptr::copy_nonoverlapping( - $src.as_ptr(), - $dst.as_mut_ptr() as *mut u8, - $src.len()); - } - for v in $dst.iter_mut() { - *v = v.$which(); - } - }}; -} - -/// Reads unsigned 32 bit integers from `src` into `dst`. -/// Borrowed from the `byteorder` crate. -#[inline] -pub fn read_u32_into(src: &[u8], dst: &mut [u32]) { - read_slice!(src, dst, 4, to_le); -} - -/// Reads unsigned 64 bit integers from `src` into `dst`. -/// Borrowed from the `byteorder` crate. -#[inline] -pub fn read_u64_into(src: &[u8], dst: &mut [u64]) { - read_slice!(src, dst, 8, to_le); -} - -#[test] -fn test_read() { - let bytes = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]; - - let mut buf = [0u32; 4]; - read_u32_into(&bytes, &mut buf); - assert_eq!(buf[0], 0x04030201); - assert_eq!(buf[3], 0x100F0E0D); - - let mut buf = [0u32; 3]; - read_u32_into(&bytes[1..13], &mut buf); // unaligned - assert_eq!(buf[0], 0x05040302); - assert_eq!(buf[2], 0x0D0C0B0A); - - let mut buf = [0u64; 2]; - read_u64_into(&bytes, &mut buf); - assert_eq!(buf[0], 0x0807060504030201); - assert_eq!(buf[1], 0x100F0E0D0C0B0A09); - - let mut buf = [0u64; 1]; - read_u64_into(&bytes[7..15], &mut buf); // unaligned - assert_eq!(buf[0], 0x0F0E0D0C0B0A0908); -} |