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
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
#![cfg_attr(not(test), no_std)]
use core::str;
#[doc(hidden)]
pub mod wide;
#[doc(hidden)]
pub mod cfo;
mod murmur3;
pub use self::murmur3::murmur3;
mod pos;
pub use self::pos::position;
#[doc(hidden)]
pub mod xref;
#[macro_export]
macro_rules! random {
($ty:ident $(, $seeds:expr)* $(,)?) => {{
const _RANDOM_ENTROPY: u64 = $crate::entropy(concat!(file!(), ":", line!(), ":", column!() $(, ":", $seeds)*));
$crate::__random_cast!($ty, _RANDOM_ENTROPY)
}};
}
#[doc(hidden)]
#[macro_export]
macro_rules! __random_cast {
(u8, $seed:expr) => { $seed as u8 };
(u16, $seed:expr) => { $seed as u16 };
(u32, $seed:expr) => { $seed as u32 };
(u64, $seed:expr) => { $seed as u64 };
(usize, $seed:expr) => { $seed as usize };
(i8, $seed:expr) => { $seed as i8 };
(i16, $seed:expr) => { $seed as i16 };
(i32, $seed:expr) => { $seed as i32 };
(i64, $seed:expr) => { $seed as i64 };
(isize, $seed:expr) => { $seed as isize };
(bool, $seed:expr) => { $seed as i64 >= 0 };
(f32, $seed:expr) => { f32::from_bits(0b0_01111111 << (f32::MANTISSA_DIGITS - 1) | ($seed as u32 >> 9)) };
(f64, $seed:expr) => { f64::from_bits(0b0_01111111111 << (f64::MANTISSA_DIGITS - 1) | ($seed >> 12)) };
($ty:ident, $seed:expr) => { compile_error!(concat!("unsupported type: ", stringify!($ty))) };
}
#[inline(always)]
pub const fn splitmix(seed: u64) -> u64 {
let next = seed.wrapping_add(0x9e3779b97f4a7c15);
let mut z = next;
z = (z ^ (z >> 30)).wrapping_mul(0xbf58476d1ce4e5b9);
z = (z ^ (z >> 27)).wrapping_mul(0x94d049bb133111eb);
return z ^ (z >> 31);
}
#[inline(always)]
pub const fn hash(s: &str) -> u32 {
let s = s.as_bytes();
let mut result = 3581u32;
let mut i = 0usize;
while i < s.len() {
result = result.wrapping_mul(33) ^ s[i] as u32;
i += 1;
}
return result;
}
#[macro_export]
macro_rules! hash {
($s:expr) => {{ const _DJB2_HASH: u32 = $crate::hash($s); _DJB2_HASH }};
}
#[doc(hidden)]
#[inline(always)]
pub const fn entropy(string: &str) -> u64 {
splitmix(SEED ^ splitmix(hash(string) as u64))
}
#[doc(hidden)]
#[macro_export]
macro_rules! __entropy {
($($seeds:expr),* $(,)?) => {
$crate::entropy(concat!(file!(), ":", line!(), ":", column!() $(, ":", $seeds)*))
};
}
pub const SEED: u64 = splitmix(hash(match option_env!("OBFSTR_SEED") { Some(seed) => seed, None => "FIXED" }) as u64);
#[doc(hidden)]
pub mod bytes;
#[doc(hidden)]
pub mod words;
#[doc(hidden)]
#[inline(always)]
pub fn unsafe_as_str(bytes: &[u8]) -> &str {
#[cfg(debug_assertions)]
return str::from_utf8(bytes).unwrap();
#[cfg(not(debug_assertions))]
return unsafe { str::from_utf8_unchecked(bytes) };
}