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
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170

use std::os::unix::{
    io::OwnedFd,
    prelude::{AsRawFd, FromRawFd, RawFd},
};

use fixed::{traits::ToFixed, types::extra::U8};
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct NewId(pub u32);

impl From<u32> for NewId {
    fn from(id: u32) -> Self {
        NewId(id)
    }
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct Fixed(pub fixed::FixedI32<U8>);
#[derive(Debug)]
pub enum Fd {
    Raw(RawFd),
    Owned(OwnedFd),
}
impl From<RawFd> for Fd {
    fn from(fd: RawFd) -> Self {
        Fd::Raw(fd)
    }
}

impl From<OwnedFd> for Fd {
    fn from(fd: OwnedFd) -> Self {
        Fd::Owned(fd)
    }
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct Object(pub u32);

impl From<u32> for Object {
    fn from(id: u32) -> Self {
        Object(id)
    }
}

#[derive(Debug, Clone, PartialEq, Eq, Copy)]
pub struct Str<'a>(pub &'a [u8]);
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct String(pub Vec<u8>);

impl From<std::string::String> for String {
    fn from(s: std::string::String) -> Self {
        String(s.into_bytes())
    }
}

impl<'a> From<&'a [u8]> for Str<'a> {
    fn from(value: &'a [u8]) -> Self {
        Str(value)
    }
}

impl<'a, const N: usize> From<&'a [u8; N]> for Str<'a> {
    fn from(value: &'a [u8; N]) -> Self {
        Str(value)
    }
}

impl String {
    pub fn as_str(&self) -> Str {
        Str(&self.0[..])
    }
}

impl ::std::fmt::Display for NewId {
    fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
        write!(f, "NewId({})", self.0)
    }
}

impl AsRawFd for Fd {
    fn as_raw_fd(&self) -> RawFd {
        match self {
            Fd::Raw(fd) => *fd,
            Fd::Owned(fd) => fd.as_raw_fd(),
        }
    }
}

impl ::std::cmp::PartialEq for Fd {
    fn eq(&self, other: &Self) -> bool {
        self.as_raw_fd() == other.as_raw_fd()
    }
}

impl ::std::cmp::Eq for Fd {}

impl Fd {
    /// Convert a `Fd` into an `OwnedFd`.
    ///
    /// # Safety
    ///
    /// The `Fd` must own the contained file descriptor, i.e. this file
    /// descriptor must not be used elsewhere. This is because `OwnedFd`
    /// will close the file descriptor when it is dropped, and invalidate
    /// the file descriptor if it's incorrectly used elsewhere.
    pub unsafe fn assume_owned(&mut self) -> &mut OwnedFd {
        match self {
            Fd::Raw(fd) => {
                *self = Fd::Owned(OwnedFd::from_raw_fd(*fd));
                match self {
                    Fd::Owned(fd) => fd,
                    // Safety: we just assigned OwnedFd to self
                    Fd::Raw(_) => std::hint::unreachable_unchecked(),
                }
            },
            Fd::Owned(fd) => fd,
        }
    }

    /// Take ownership of the file descriptor.
    ///
    /// This will return `None` if the `Fd` does not own the file descriptor.
    pub fn take(&mut self) -> Option<OwnedFd> {
        match self {
            Fd::Raw(_) => None,
            Fd::Owned(fd) => {
                let mut fd2 = Fd::Raw(fd.as_raw_fd());
                std::mem::swap(self, &mut fd2);
                match fd2 {
                    Fd::Owned(fd) => Some(fd),
                    // Safety: we just swapped a Fd::Owned into fd2
                    Fd::Raw(_) => unsafe { std::hint::unreachable_unchecked() },
                }
            },
        }
    }

    /// Take ownership of the file descriptor.
    ///
    /// # Panic
    ///
    /// Panics if the `Fd` does not own the file descriptor.
    pub fn unwrap_owned(self) -> OwnedFd {
        match self {
            Fd::Raw(_) => panic!("file descriptor was not owned"),
            Fd::Owned(fd) => fd,
        }
    }

    /// Get a mutable reference to the owned file descriptor.
    ///
    /// # Panic
    ///
    /// Panics if the `Fd` does not own the file descriptor.
    pub fn unwrap_owned_mut(&mut self) -> &mut OwnedFd {
        match self {
            Fd::Raw(_) => panic!("file descriptor was not owned"),
            Fd::Owned(fd) => fd,
        }
    }
}

impl Fixed {
    pub fn from_bits(v: i32) -> Self {
        Self(fixed::FixedI32::from_bits(v))
    }

    pub fn from_num<Src: ToFixed>(src: Src) -> Self {
        Self(fixed::FixedI32::from_num(src))
    }
}