#![allow(clippy::unnecessary_cast)]
#![allow(clippy::manual_slice_size_calculation)]
use core::{
mem::size_of,
num::{NonZeroU32, NonZeroU8},
};
use bytemuck::{checked::CheckedCastError, *};
#[test]
fn test_try_cast_slice() {
// some align4 data
let nonzero_u32_slice: &[NonZeroU32] = &[
NonZeroU32::new(4).unwrap(),
NonZeroU32::new(5).unwrap(),
NonZeroU32::new(6).unwrap(),
];
// contains bytes with invalid bitpattern for NonZeroU8
assert_eq!(
checked::try_cast_slice::<NonZeroU32, NonZeroU8>(nonzero_u32_slice),
Err(CheckedCastError::InvalidBitPattern)
);
// the same data as align1
let the_bytes: &[u8] = checked::try_cast_slice(nonzero_u32_slice).unwrap();
assert_eq!(
nonzero_u32_slice.as_ptr() as *const NonZeroU32 as usize,
the_bytes.as_ptr() as *const u8 as usize
);
assert_eq!(
nonzero_u32_slice.len() * size_of::<NonZeroU32>(),
the_bytes.len() * size_of::<u8>()
);
// by taking one byte off the front, we're definitely mis-aligned for
// NonZeroU32.
let mis_aligned_bytes = &the_bytes[1..];
assert_eq!(
checked::try_cast_slice::<u8, NonZeroU32>(mis_aligned_bytes),
Err(CheckedCastError::PodCastError(
PodCastError::TargetAlignmentGreaterAndInputNotAligned
))
);
// by taking one byte off the end, we're aligned but would have slop bytes for
// NonZeroU32
let the_bytes_len_minus1 = the_bytes.len() - 1;
let slop_bytes = &the_bytes[..the_bytes_len_minus1];
assert_eq!(
checked::try_cast_slice::<u8, NonZeroU32>(slop_bytes),
Err(CheckedCastError::PodCastError(PodCastError::OutputSliceWouldHaveSlop))
);
// if we don't mess with it we can up-alignment cast
checked::try_cast_slice::<u8, NonZeroU32>(the_bytes).unwrap();
}
#[test]
fn test_try_cast_slice_mut() {
// some align4 data
let u32_slice: &mut [u32] = &mut [4, 5, 6];
// contains bytes with invalid bitpattern for NonZeroU8
assert_eq!(
checked::try_cast_slice_mut::<u32, NonZeroU8>(u32_slice),
Err(CheckedCastError::InvalidBitPattern)
);
// some align4 data
let u32_slice: &mut [u32] = &mut [0x4444_4444, 0x5555_5555, 0x6666_6666];
let u32_len = u32_slice.len();
let u32_ptr = u32_slice.as_ptr();
// the same data as align1, nonzero bytes
let the_nonzero_bytes: &mut [NonZeroU8] =
checked::try_cast_slice_mut(u32_slice).unwrap();
let the_nonzero_bytes_len = the_nonzero_bytes.len();
let the_nonzero_bytes_ptr = the_nonzero_bytes.as_ptr();
assert_eq!(
u32_ptr as *const u32 as usize,
the_nonzero_bytes_ptr as *const NonZeroU8 as usize
);
assert_eq!(
u32_len * size_of::<u32>(),
the_nonzero_bytes_len * size_of::<NonZeroU8>()
);
// the same data as align1
let the_bytes: &mut [u8] = checked::try_cast_slice_mut(u32_slice).unwrap();
let the_bytes_len = the_bytes.len();
let the_bytes_ptr = the_bytes.as_ptr();
assert_eq!(
u32_ptr as *const u32 as usize,
the_bytes_ptr as *const u8 as usize
);
assert_eq!(
u32_len * size_of::<u32>(),
the_bytes_len * size_of::<NonZeroU8>()
);
// by taking one byte off the front, we're definitely mis-aligned for u32.
let mis_aligned_bytes = &mut the_bytes[1..];
assert_eq!(
checked::try_cast_slice_mut::<u8, NonZeroU32>(mis_aligned_bytes),
Err(CheckedCastError::PodCastError(
PodCastError::TargetAlignmentGreaterAndInputNotAligned
))
);
// by taking one byte off the end, we're aligned but would have slop bytes for
// NonZeroU32
let the_bytes_len_minus1 = the_bytes.len() - 1;
let slop_bytes = &mut the_bytes[..the_bytes_len_minus1];
assert_eq!(
checked::try_cast_slice_mut::<u8, NonZeroU32>(slop_bytes),
Err(CheckedCastError::PodCastError(PodCastError::OutputSliceWouldHaveSlop))
);
// if we don't mess with it we can up-alignment cast, since there are no
// zeroes in the original slice
checked::try_cast_slice_mut::<u8, NonZeroU32>(the_bytes).unwrap();
}
#[test]
fn test_types() {
let _: NonZeroU32 = checked::cast(1.0_f32);
let _: &mut NonZeroU32 = checked::cast_mut(&mut 1.0_f32);
let _: &NonZeroU32 = checked::cast_ref(&1.0_f32);
let _: &[NonZeroU32] = checked::cast_slice(&[1.0_f32]);
let _: &mut [NonZeroU32] = checked::cast_slice_mut(&mut [1.0_f32]);
//
let _: Result<NonZeroU32, CheckedCastError> = checked::try_cast(1.0_f32);
let _: Result<&mut NonZeroU32, CheckedCastError> =
checked::try_cast_mut(&mut 1.0_f32);
let _: Result<&NonZeroU32, CheckedCastError> =
checked::try_cast_ref(&1.0_f32);
let _: Result<&[NonZeroU32], CheckedCastError> =
checked::try_cast_slice(&[1.0_f32]);
let _: Result<&mut [NonZeroU32], CheckedCastError> =
checked::try_cast_slice_mut(&mut [1.0_f32]);
}
#[test]
fn test_try_pod_read_unaligned() {
let u32s = [0xaabbccdd, 0x11223344_u32];
let bytes = bytemuck::checked::cast_slice::<u32, u8>(&u32s);
#[cfg(target_endian = "big")]
assert_eq!(
checked::try_pod_read_unaligned::<NonZeroU32>(&bytes[1..5]),
Ok(NonZeroU32::new(0xbbccdd11).unwrap())
);
#[cfg(target_endian = "little")]
assert_eq!(
checked::try_pod_read_unaligned::<NonZeroU32>(&bytes[1..5]),
Ok(NonZeroU32::new(0x44aabbcc).unwrap())
);
let u32s = [0; 2];
let bytes = bytemuck::checked::cast_slice::<u32, u8>(&u32s);
assert_eq!(
checked::try_pod_read_unaligned::<NonZeroU32>(&bytes[1..5]),
Err(CheckedCastError::InvalidBitPattern)
);
}
#[test]
fn test_try_from_bytes() {
let nonzero_u32s = [
NonZeroU32::new(0xaabbccdd).unwrap(),
NonZeroU32::new(0x11223344).unwrap(),
];
let bytes = bytemuck::checked::cast_slice::<NonZeroU32, u8>(&nonzero_u32s);
assert_eq!(
checked::try_from_bytes::<NonZeroU32>(&bytes[..4]),
Ok(&nonzero_u32s[0])
);
assert_eq!(
checked::try_from_bytes::<NonZeroU32>(&bytes[..5]),
Err(CheckedCastError::PodCastError(PodCastError::SizeMismatch))
);
assert_eq!(
checked::try_from_bytes::<NonZeroU32>(&bytes[..3]),
Err(CheckedCastError::PodCastError(PodCastError::SizeMismatch))
);
assert_eq!(
checked::try_from_bytes::<NonZeroU32>(&bytes[1..5]),
Err(CheckedCastError::PodCastError(
PodCastError::TargetAlignmentGreaterAndInputNotAligned
))
);
let zero_u32s = [0, 0x11223344_u32];
let bytes = bytemuck::checked::cast_slice::<u32, u8>(&zero_u32s);
assert_eq!(
checked::try_from_bytes::<NonZeroU32>(&bytes[..4]),
Err(CheckedCastError::InvalidBitPattern)
);
assert_eq!(
checked::try_from_bytes::<NonZeroU32>(&bytes[4..]),
Ok(&NonZeroU32::new(zero_u32s[1]).unwrap())
);
assert_eq!(
checked::try_from_bytes::<NonZeroU32>(&bytes[..5]),
Err(CheckedCastError::PodCastError(PodCastError::SizeMismatch))
);
assert_eq!(
checked::try_from_bytes::<NonZeroU32>(&bytes[..3]),
Err(CheckedCastError::PodCastError(PodCastError::SizeMismatch))
);
assert_eq!(
checked::try_from_bytes::<NonZeroU32>(&bytes[1..5]),
Err(CheckedCastError::PodCastError(
PodCastError::TargetAlignmentGreaterAndInputNotAligned
))
);
}
#[test]
fn test_try_from_bytes_mut() {
let a = 0xaabbccdd_u32;
let b = 0x11223344_u32;
let mut u32s = [a, b];
let bytes = bytemuck::checked::cast_slice_mut::<u32, u8>(&mut u32s);
assert_eq!(
checked::try_from_bytes_mut::<NonZeroU32>(&mut bytes[..4]),
Ok(&mut NonZeroU32::new(a).unwrap())
);
assert_eq!(
checked::try_from_bytes_mut::<NonZeroU32>(&mut bytes[4..]),
Ok(&mut NonZeroU32::new(b).unwrap())
);
assert_eq!(
checked::try_from_bytes_mut::<NonZeroU32>(&mut bytes[..5]),
Err(CheckedCastError::PodCastError(PodCastError::SizeMismatch))
);
assert_eq!(
checked::try_from_bytes_mut::<NonZeroU32>(&mut bytes[..3]),
Err(CheckedCastError::PodCastError(PodCastError::SizeMismatch))
);
assert_eq!(
checked::try_from_bytes::<NonZeroU32>(&bytes[1..5]),
Err(CheckedCastError::PodCastError(
PodCastError::TargetAlignmentGreaterAndInputNotAligned
))
);
let mut u32s = [0, b];
let bytes = bytemuck::checked::cast_slice_mut::<u32, u8>(&mut u32s);
assert_eq!(
checked::try_from_bytes_mut::<NonZeroU32>(&mut bytes[..4]),
Err(CheckedCastError::InvalidBitPattern)
);
assert_eq!(
checked::try_from_bytes_mut::<NonZeroU32>(&mut bytes[4..]),
Ok(&mut NonZeroU32::new(b).unwrap())
);
assert_eq!(
checked::try_from_bytes_mut::<NonZeroU32>(&mut bytes[..5]),
Err(CheckedCastError::PodCastError(PodCastError::SizeMismatch))
);
assert_eq!(
checked::try_from_bytes_mut::<NonZeroU32>(&mut bytes[..3]),
Err(CheckedCastError::PodCastError(PodCastError::SizeMismatch))
);
assert_eq!(
checked::try_from_bytes::<NonZeroU32>(&bytes[1..5]),
Err(CheckedCastError::PodCastError(
PodCastError::TargetAlignmentGreaterAndInputNotAligned
))
);
}
#[test]
fn test_from_bytes() {
let abcd = 0xaabbccdd_u32;
let aligned_bytes = bytemuck::bytes_of(&abcd);
assert_eq!(
checked::from_bytes::<NonZeroU32>(aligned_bytes),
&NonZeroU32::new(abcd).unwrap()
);
assert!(core::ptr::eq(
checked::from_bytes(aligned_bytes) as *const NonZeroU32 as *const u32,
&abcd
));
}
#[test]
fn test_from_bytes_mut() {
let mut a = 0xaabbccdd_u32;
let a_addr = &a as *const _ as usize;
let aligned_bytes = bytemuck::bytes_of_mut(&mut a);
assert_eq!(
*checked::from_bytes_mut::<NonZeroU32>(aligned_bytes),
NonZeroU32::new(0xaabbccdd).unwrap()
);
assert_eq!(
checked::from_bytes_mut::<NonZeroU32>(aligned_bytes) as *const NonZeroU32
as usize,
a_addr
);
}
// like #[should_panic], but can be a part of another test, instead of requiring
// it to be it's own test.
macro_rules! should_panic {
($ex:expr) => {
assert!(
std::panic::catch_unwind(|| {
let _ = $ex;
})
.is_err(),
concat!("should have panicked: `", stringify!($ex), "`")
);
};
}
#[test]
fn test_panics() {
should_panic!(checked::cast::<u32, NonZeroU32>(0));
should_panic!(checked::cast_ref::<u32, NonZeroU32>(&0));
should_panic!(checked::cast_mut::<u32, NonZeroU32>(&mut 0));
should_panic!(checked::cast_slice::<u8, NonZeroU32>(&[1u8, 2u8]));
should_panic!(checked::cast_slice_mut::<u8, NonZeroU32>(&mut [1u8, 2u8]));
should_panic!(checked::from_bytes::<NonZeroU32>(&[1u8, 2]));
should_panic!(checked::from_bytes::<NonZeroU32>(&[1u8, 2, 3, 4, 5]));
should_panic!(checked::from_bytes_mut::<NonZeroU32>(&mut [1u8, 2]));
should_panic!(checked::from_bytes_mut::<NonZeroU32>(&mut [1u8, 2, 3, 4, 5]));
// use cast_slice on some u32s to get some align>=4 bytes, so we can know
// we'll give from_bytes unaligned ones.
let aligned_bytes = bytemuck::cast_slice::<u32, u8>(&[0, 0]);
should_panic!(checked::from_bytes::<NonZeroU32>(aligned_bytes));
should_panic!(checked::from_bytes::<NonZeroU32>(&aligned_bytes[1..5]));
should_panic!(checked::pod_read_unaligned::<NonZeroU32>(
&aligned_bytes[1..5]
));
}
#[test]
fn test_char() {
assert_eq!(checked::try_cast::<u32, char>(0), Ok('\0'));
assert_eq!(checked::try_cast::<u32, char>(0xd7ff), Ok('\u{d7ff}'));
assert_eq!(
checked::try_cast::<u32, char>(0xd800),
Err(CheckedCastError::InvalidBitPattern)
);
assert_eq!(
checked::try_cast::<u32, char>(0xdfff),
Err(CheckedCastError::InvalidBitPattern)
);
assert_eq!(checked::try_cast::<u32, char>(0xe000), Ok('\u{e000}'));
assert_eq!(checked::try_cast::<u32, char>(0x10ffff), Ok('\u{10ffff}'));
assert_eq!(
checked::try_cast::<u32, char>(0x110000),
Err(CheckedCastError::InvalidBitPattern)
);
assert_eq!(
checked::try_cast::<u32, char>(-1i32 as u32),
Err(CheckedCastError::InvalidBitPattern)
);
}
#[test]
fn test_bool() {
assert_eq!(checked::try_cast::<u8, bool>(0), Ok(false));
assert_eq!(checked::try_cast::<u8, bool>(1), Ok(true));
for i in 2..=255 {
assert_eq!(
checked::try_cast::<u8, bool>(i),
Err(CheckedCastError::InvalidBitPattern)
);
}
assert_eq!(checked::try_from_bytes::<bool>(&[1]), Ok(&true));
assert_eq!(
checked::try_from_bytes::<bool>(&[3]),
Err(CheckedCastError::InvalidBitPattern)
);
assert_eq!(
checked::try_from_bytes::<bool>(&[0, 1]),
Err(CheckedCastError::PodCastError(PodCastError::SizeMismatch))
);
}
#[test]
fn test_all_nonzero() {
use core::num::*;
macro_rules! test_nonzero {
($nonzero:ty: $primitive:ty) => {
assert_eq!(
checked::try_cast::<$primitive, $nonzero>(0),
Err(CheckedCastError::InvalidBitPattern)
);
assert_eq!(
checked::try_cast::<$primitive, $nonzero>(1),
Ok(<$nonzero>::new(1).unwrap())
);
};
}
test_nonzero!(NonZeroU8: u8);
test_nonzero!(NonZeroI8: i8);
test_nonzero!(NonZeroU16: u16);
test_nonzero!(NonZeroI16: i16);
test_nonzero!(NonZeroU32: u32);
test_nonzero!(NonZeroI32: i32);
test_nonzero!(NonZeroU64: u64);
test_nonzero!(NonZeroI64: i64);
test_nonzero!(NonZeroU128: u128);
test_nonzero!(NonZeroI128: i128);
test_nonzero!(NonZeroUsize: usize);
test_nonzero!(NonZeroIsize: isize);
}
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