1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
use assertions::const_assert;
use std::mem::{align_of, size_of};
use DataInit;
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 DataInit 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 equality() {
let v = 0x0123456789ABCDEF 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!(v, endian_into);
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);
}