45 lines
1.4 KiB
Rust
45 lines
1.4 KiB
Rust
|
// Copyright 2022 Christian Ulrich
|
||
|
|
//
|
||
|
|
// This program is free software: you can redistribute it and/or modify
|
||
|
|
// it under the terms of the GNU General Public License as published by
|
||
|
|
// the Free Software Foundation, either version 3 of the License, or
|
||
|
|
// (at your option) any later version.
|
||
|
|
//
|
||
|
|
// This program is distributed in the hope that it will be useful,
|
||
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
// GNU General Public License for more details.
|
||
|
|
//
|
||
|
|
// You should have received a copy of the GNU General Public License
|
||
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
|
||
|
|
use std::io::{self, Read};
|
||
|
|
|
||
|
|
pub struct DatastreamWindows<const N: usize> {
|
||
|
|
window: [u8; N],
|
||
|
|
}
|
||
|
|
|
||
|
|
impl<const N: usize> DatastreamWindows<N> {
|
||
|
|
pub fn from_stdin() -> Result<Self, &'static str> {
|
||
|
|
let mut window = [0; N];
|
||
|
|
io::stdin()
|
||
|
|
.read_exact(&mut window[1..N])
|
||
|
|
.map_err(|_| "not enough data available")?;
|
||
|
|
Ok(Self { window: window })
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
impl<const N: usize> Iterator for DatastreamWindows<N> {
|
||
|
|
type Item = [u8; N];
|
||
|
|
|
||
|
|
fn next(&mut self) -> Option<Self::Item> {
|
||
|
|
for byte in io::stdin().bytes() {
|
||
|
|
let byte = byte.unwrap();
|
||
|
|
self.window.rotate_left(1);
|
||
|
|
self.window[N - 1] = byte;
|
||
|
|
return Some(self.window);
|
||
|
|
}
|
||
|
|
None
|
||
|
|
}
|
||
|
|
}
|