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
pub mod imc;
pub struct BitIter<'a> {
state: u8,
buffer: u8,
inner: std::slice::Iter<'a, u8>,
}
impl<'a> BitIter<'a> {
pub fn new(bytes: &'a [u8]) -> BitIter<'a> {
BitIter {
state: 0,
buffer: 0,
inner: bytes.iter(),
}
}
}
impl Iterator for BitIter<'_> {
type Item = bool;
fn next(&mut self) -> Option<Self::Item> {
if self.state == 0 {
self.state = 7;
if let Some(value) = self.inner.next() {
self.buffer = *value;
} else {
return None;
}
} else {
self.state -= 1;
}
let (next_buffer, carry) = self.buffer.overflowing_mul(2);
self.buffer = next_buffer;
Some(carry)
}
fn size_hint(&self) -> (usize, Option<usize>) {
let size = self.inner.size_hint().0 * 8 + self.state as usize;
(size, Some(size))
}
fn count(self) -> usize
where
Self: Sized,
{
self.inner.count() * 8 + self.state as usize
}
}