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use std::mem::{align_of, size_of};
use crate::bytes::ByteValued;
macro_rules! const_assert {
($condition:expr) => {
let _ = [(); 0 - !$condition as usize];
};
}
macro_rules! endian_type {
($old_type:ident, $new_type:ident, $to_new:ident, $from_new:ident) => {
#[derive(Copy, Clone, Eq, PartialEq, Debug, Default)]
pub struct $new_type($old_type);
impl $new_type {
fn _assert() {
const_assert!(align_of::<$new_type>() == align_of::<$old_type>());
const_assert!(size_of::<$new_type>() == size_of::<$old_type>());
}
pub fn to_native(self) -> $old_type {
$old_type::$from_new(self.0)
}
}
unsafe impl ByteValued for $new_type {}
impl PartialEq<$old_type> for $new_type {
fn eq(&self, other: &$old_type) -> bool {
self.0 == $old_type::$to_new(*other)
}
}
impl PartialEq<$new_type> for $old_type {
fn eq(&self, other: &$new_type) -> bool {
$old_type::$to_new(other.0) == *self
}
}
impl Into<$old_type> for $new_type {
fn into(self) -> $old_type {
$old_type::$from_new(self.0)
}
}
impl From<$old_type> for $new_type {
fn from(v: $old_type) -> $new_type {
$new_type($old_type::$to_new(v))
}
}
};
}
endian_type!(u16, Le16, to_le, from_le);
endian_type!(u32, Le32, to_le, from_le);
endian_type!(u64, Le64, to_le, from_le);
endian_type!(usize, LeSize, to_le, from_le);
endian_type!(u16, Be16, to_be, from_be);
endian_type!(u32, Be32, to_be, from_be);
endian_type!(u64, Be64, to_be, from_be);
endian_type!(usize, BeSize, to_be, from_be);
#[cfg(test)]
mod tests {
use super::*;
use std::convert::From;
use std::mem::transmute;
#[cfg(target_endian = "little")]
const NATIVE_LITTLE: bool = true;
#[cfg(target_endian = "big")]
const NATIVE_LITTLE: bool = false;
const NATIVE_BIG: bool = !NATIVE_LITTLE;
macro_rules! endian_test {
($old_type:ty, $new_type:ty, $test_name:ident, $native:expr) => {
mod $test_name {
use super::*;
#[allow(overflowing_literals)]
#[test]
fn test_endian_type() {
<$new_type>::_assert();
let v = 0x0123_4567_89AB_CDEF as $old_type;
let endian_v: $new_type = From::from(v);
let endian_into: $old_type = endian_v.into();
let endian_transmute: $old_type = unsafe { transmute(endian_v) };
if $native {
assert_eq!(endian_v, endian_transmute);
} else {
assert_eq!(endian_v, endian_transmute.swap_bytes());
}
assert_eq!(endian_into, v);
assert_eq!(endian_v.to_native(), v);
assert!(v == endian_v);
assert!(endian_v == v);
}
}
};
}
endian_test!(u16, Le16, test_le16, NATIVE_LITTLE);
endian_test!(u32, Le32, test_le32, NATIVE_LITTLE);
endian_test!(u64, Le64, test_le64, NATIVE_LITTLE);
endian_test!(usize, LeSize, test_le_size, NATIVE_LITTLE);
endian_test!(u16, Be16, test_be16, NATIVE_BIG);
endian_test!(u32, Be32, test_be32, NATIVE_BIG);
endian_test!(u64, Be64, test_be64, NATIVE_BIG);
endian_test!(usize, BeSize, test_be_size, NATIVE_BIG);
}