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

use std::io;

pub trait ReadBytes {
    fn read_bytes_be<T>(&mut self) -> io::Result<T>
    where
        T: BytesConvertible;

    fn read_bytes_le<T>(&mut self) -> io::Result<T>
    where
        T: BytesConvertible;
}

pub trait WriteBytes {
    fn write_bytes_be<T>(&mut self, value: T) -> io::Result<usize>
    where
        T: BytesConvertible;

    fn write_bytes_le<T>(&mut self, value: T) -> io::Result<usize>
    where
        T: BytesConvertible;
}

impl<R> ReadBytes for R
where
    R: io::Read,
{
    fn read_bytes_be<T>(&mut self) -> io::Result<T>
    where
        T: BytesConvertible,
    {
        T::read_bytes_be(self)
    }

    fn read_bytes_le<T>(&mut self) -> io::Result<T>
    where
        T: BytesConvertible,
    {
        T::read_bytes_le(self)
    }
}

impl<W> WriteBytes for W
where
    W: io::Write,
{
    fn write_bytes_be<T>(&mut self, value: T) -> io::Result<usize>
    where
        T: BytesConvertible,
    {
        value.write_bytes_be(self)
    }

    fn write_bytes_le<T>(&mut self, value: T) -> io::Result<usize>
    where
        T: BytesConvertible,
    {
        value.write_bytes_le(self)
    }
}

pub trait BytesConvertible {
    fn read_bytes_be<R>(buf: &mut R) -> io::Result<Self>
    where
        Self: Sized,
        R: io::Read;

    fn read_bytes_le<R>(buf: &mut R) -> io::Result<Self>
    where
        Self: Sized,
        R: io::Read;

    fn write_bytes_be<W>(self, buf: &mut W) -> io::Result<usize>
    where
        Self: Sized,
        W: io::Write;

    fn write_bytes_le<W>(self, buf: &mut W) -> io::Result<usize>
    where
        Self: Sized,
        W: io::Write;
}

macro_rules! impl_bytes_convertible {
    ($($ty:ty,)*) => {
        $(
            impl BytesConvertible for $ty {
                fn read_bytes_be<R>(buf: &mut R) -> io::Result<Self>
                where
                    R: io::Read,
                {
                    let mut tmp = [0; std::mem::size_of::<$ty>()];
                    buf.read_exact(&mut tmp)?;
                    Ok(<$ty>::from_be_bytes(tmp))
                }

                fn read_bytes_le<R>(buf: &mut R) -> io::Result<Self>
                where
                    R: io::Read,
                {
                    let mut tmp = [0; std::mem::size_of::<$ty>()];
                    buf.read_exact(&mut tmp)?;
                    Ok(<$ty>::from_le_bytes(tmp))
                }

                fn write_bytes_be<W>(self, buf: &mut W) -> io::Result<usize>
                where
                    W: io::Write,
                {
                    let tmp = self.to_be_bytes();
                    buf.write(&tmp)
                }

                fn write_bytes_le<W>(self, buf: &mut W) -> io::Result<usize>
                where
                    W: io::Write,
                {
                    let tmp = self.to_le_bytes();
                    buf.write(&tmp)
                }
            }
        )*
    };
}

impl_bytes_convertible! {
    u8,
    u16,
    u32,
    u64,
    i8,
    i16,
    i32,
    i64,
    f32,
    f64,
}