ruyi 0.1.6

An event-driven framework for non-blocking, asynchronous I/O in Rust
Documentation 
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

use std::mem;
use std::io::{self, Error, ErrorKind};
use std::ptr;

use super::U16_SIZE;
use super::super::reverse;
use super::super::super::{ReadIter, GetIter, SetIter, Appender, Prepender};

#[inline]
pub fn read(chain: &mut ReadIter) -> io::Result<u16> {
    let mut v: u16 = unsafe { mem::uninitialized() };
    let mut ptr_dst: *mut u8 = unsafe { mem::transmute(&mut v) };
    let mut n = U16_SIZE;
    for mut block in chain {
        let off = block.read_pos();
        let ptr_src = unsafe { block.as_ptr().offset(off as isize) };
        let len = block.len();
        if len >= n {
            unsafe { ptr::copy_nonoverlapping(ptr_src, ptr_dst, n) };
            if cfg!(target_endian = "little") {
                reverse(unsafe { mem::transmute(&mut v) }, U16_SIZE);
            }
            block.set_read_pos(off + n);
            return Ok(v);
        }
        n -= len;
        unsafe {
            ptr::copy_nonoverlapping(ptr_src, ptr_dst, len);
            ptr_dst = ptr_dst.offset(len as isize);
        }
        let pos = block.write_pos();
        block.set_read_pos(pos);
    }
    Err(Error::new(
        ErrorKind::UnexpectedEof,
        "codec::u16::big_endian::read",
    ))
}

pub fn get(chain: &mut GetIter) -> io::Result<u16> {
    let mut v: u16 = unsafe { mem::uninitialized() };
    let mut ptr_dst: *mut u8 = unsafe { mem::transmute(&mut v) };
    let mut n = U16_SIZE;
    for block in chain {
        let off = block.read_pos() as isize;
        let ptr_src = unsafe { block.as_ptr().offset(off) };
        let len = block.len();
        if len >= n {
            unsafe { ptr::copy_nonoverlapping(ptr_src, ptr_dst, n) };
            if cfg!(target_endian = "little") {
                reverse(unsafe { mem::transmute(&mut v) }, U16_SIZE);
            }
            return Ok(v);
        }
        n -= len;
        unsafe {
            ptr::copy_nonoverlapping(ptr_src, ptr_dst, len);
            ptr_dst = ptr_dst.offset(len as isize);
        }
    }
    Err(Error::new(
        ErrorKind::UnexpectedEof,
        "codec::u16::big_endian::get",
    ))
}

pub fn set(mut v: u16, chain: &mut SetIter) -> io::Result<usize> {
    let mut ptr_src: *mut u8 = unsafe { mem::transmute(&mut v) };
    if cfg!(target_endian = "little") {
        reverse(ptr_src, U16_SIZE);
    }
    let mut n = U16_SIZE;
    for mut block in chain {
        let off = block.read_pos() as isize;
        let ptr_dst = unsafe { block.as_mut_ptr().offset(off) };
        let len = block.len();
        if len >= n {
            unsafe { ptr::copy_nonoverlapping(ptr_src, ptr_dst, n) };
            return Ok(U16_SIZE);
        }
        n -= len;
        unsafe {
            ptr::copy_nonoverlapping(ptr_src, ptr_dst, len);
            ptr_src = ptr_src.offset(len as isize);
        }
    }
    Err(Error::new(
        ErrorKind::UnexpectedEof,
        "codec::u16::big_endian::set",
    ))
}

pub fn append(mut v: u16, chain: &mut Appender) -> io::Result<usize> {
    let mut ptr_src: *mut u8 = unsafe { mem::transmute(&mut v) };
    if cfg!(target_endian = "little") {
        reverse(ptr_src, U16_SIZE);
    }
    let mut n = U16_SIZE;
    loop {
        if let Some(mut block) = chain.last_mut() {
            let off = block.write_pos();
            let ptr_dst = unsafe { block.as_mut_ptr().offset(off as isize) };
            let appendable = block.appendable();
            if appendable >= n {
                unsafe { ptr::copy_nonoverlapping(ptr_src, ptr_dst, n) };
                block.set_write_pos(off + n);
                return Ok(U16_SIZE);
            }
            n -= appendable;
            unsafe {
                ptr::copy_nonoverlapping(ptr_src, ptr_dst, appendable);
                ptr_src = ptr_src.offset(appendable as isize);
            }
            let cap = block.capacity();
            block.set_write_pos(cap);
        }
        chain.append(0);
    }
}

pub fn prepend(mut v: u16, chain: &mut Prepender) -> io::Result<usize> {
    let mut ptr_src: *mut u8 = unsafe { mem::transmute(&mut v) };
    if cfg!(target_endian = "little") {
        reverse(ptr_src, U16_SIZE);
    }
    let mut n = U16_SIZE;
    unsafe { ptr_src = ptr_src.offset(n as isize) };
    loop {
        if let Some(mut block) = chain.first_mut() {
            let prependable = block.prependable();
            let mut ptr_dst = block.as_mut_ptr();
            if prependable >= n {
                let off = prependable - n;
                unsafe {
                    ptr_dst = ptr_dst.offset(off as isize);
                    ptr_src = ptr_src.offset(-(n as isize));
                    ptr::copy_nonoverlapping(ptr_src, ptr_dst, n);
                }
                block.set_read_pos(off);
                return Ok(U16_SIZE);
            }
            n -= prependable;
            unsafe {
                ptr_src = ptr_src.offset(-(prependable as isize));
                ptr::copy_nonoverlapping(ptr_src, ptr_dst, prependable);
            }
            block.set_read_pos(0);
        }
        chain.prepend(0);
    }
}