urldecoder 2.0.0

High performance URL batch decoder
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::io::{self, Write as _};

pub trait DecodeLogger {
    fn new() -> Self
    where
        Self: Sized;
    fn log_orig(&mut self, byte: u8);
    fn log_orig_slice(&mut self, slice: &[u8]);
    fn log_res(&mut self, byte: u8);
    fn log_res_slice(&mut self, slice: &[u8]);
    fn print_if_changed(&mut self, changed: bool);
    fn clear(&mut self);
}

pub struct NoOpLogger;
impl DecodeLogger for NoOpLogger {
    #[inline(always)]
    fn new() -> Self {
        Self
    }
    #[inline(always)]
    fn log_orig(&mut self, _: u8) {}
    #[inline(always)]
    fn log_orig_slice(&mut self, _: &[u8]) {}
    #[inline(always)]
    fn log_res(&mut self, _: u8) {}
    #[inline(always)]
    fn log_res_slice(&mut self, _: &[u8]) {}
    #[inline(always)]
    fn print_if_changed(&mut self, _: bool) {}
    #[inline(always)]
    fn clear(&mut self) {}
}

const LOG_RES_CAPACITY: usize = 256;
const LOG_ORIG_CAPACITY: usize = LOG_RES_CAPACITY * 3;

const ELLIPSIS: &[u8; 3] = b"...";

pub struct VerboseLogger {
    res_len: usize,
    res_buf: [u8; LOG_RES_CAPACITY],
    orig_len: usize,
    orig_buf: [u8; LOG_ORIG_CAPACITY],
}

impl DecodeLogger for VerboseLogger {
    #[inline]
    fn new() -> Self {
        Self {
            res_len: 0,
            res_buf: [0; LOG_RES_CAPACITY],
            orig_len: 0,
            orig_buf: [0; LOG_ORIG_CAPACITY],
        }
    }

    #[inline(always)]
    fn log_orig(&mut self, byte: u8) {
        if self.orig_len < LOG_ORIG_CAPACITY {
            unsafe {
                *self.orig_buf.get_unchecked_mut(self.orig_len) = byte;
            }
            self.orig_len += 1;
        }
    }

    #[inline(always)]
    fn log_orig_slice(&mut self, slice: &[u8]) {
        unsafe {
            if self.orig_len + slice.len() < LOG_ORIG_CAPACITY {
                self.orig_buf
                    .get_unchecked_mut(self.orig_len..self.orig_len + slice.len())
                    .copy_from_slice(slice);
                self.orig_len += slice.len();
            } else {
                let cp = LOG_ORIG_CAPACITY - self.orig_len;
                self.orig_buf
                    .get_unchecked_mut(self.orig_len..LOG_ORIG_CAPACITY)
                    .copy_from_slice(&slice[..cp]);
                self.orig_len = LOG_ORIG_CAPACITY;
            }
        }
    }

    #[inline(always)]
    fn log_res(&mut self, byte: u8) {
        if self.res_len < LOG_RES_CAPACITY {
            unsafe {
                *self.res_buf.get_unchecked_mut(self.res_len) = byte;
            }
            self.res_len += 1;
        }
    }

    #[inline(always)]
    fn log_res_slice(&mut self, slice: &[u8]) {
        unsafe {
            if self.res_len + slice.len() < LOG_RES_CAPACITY {
                self.res_buf
                    .get_unchecked_mut(self.res_len..self.res_len + slice.len())
                    .copy_from_slice(slice);
                self.res_len += slice.len();
            } else {
                let cp = LOG_RES_CAPACITY - self.res_len;
                self.res_buf
                    .get_unchecked_mut(self.res_len..LOG_RES_CAPACITY)
                    .copy_from_slice(&slice[..cp]);
                self.res_len = LOG_RES_CAPACITY;
            }
        }
    }

    #[inline]
    fn print_if_changed(&mut self, changed: bool) {
        if !changed {
            return;
        }

        self.print_impl();
    }

    #[inline(always)]
    fn clear(&mut self) {
        self.res_len = 0;
        self.orig_len = 0;
    }
}

impl VerboseLogger {
    fn print_impl(&mut self) {
        let orig = &self.orig_buf[..self.orig_len];
        let res = &self.res_buf[..self.res_len];

        let stdout = io::stdout();
        let handle = stdout.lock();
        let mut writer = io::BufWriter::new(handle);
        writer.write_all("\x1b[31m- ".as_bytes()).unwrap();
        writer.write_all(orig).unwrap();
        if self.orig_len == LOG_ORIG_CAPACITY {
            writer.write_all(ELLIPSIS).unwrap();
        }
        writer.write_all("\x1b[0m\n\x1b[32m+ ".as_bytes()).unwrap();
        writer.write_all(res).unwrap();
        if self.res_len == LOG_RES_CAPACITY {
            writer.write_all(ELLIPSIS).unwrap();
        }
        writer.write_all("\x1b[0m\n".as_bytes()).unwrap();
        writer.flush().unwrap();
    }
}