pipeviewer_exercise/
read.rs

1use crate::CHUNK_SIZE;
2use crossbeam::channel::Sender;
3use std::fs::File;
4use std::io::{self, BufReader, Read, Result};
5
6pub fn read_loop(infile: &str, stats_tx: Sender<usize>, write_tx: Sender<Vec<u8>>) -> Result<()> {
7    let mut reader: Box<dyn Read> = if !infile.is_empty() {
8        Box::new(BufReader::new(File::open(infile)?))
9    } else {
10        Box::new(BufReader::new(io::stdin()))
11    };
12
13    let mut buffer = [0; CHUNK_SIZE];
14    loop {
15        let num_read = match reader.read(&mut buffer) {
16            Ok(0) => break,
17            Ok(x) => x,
18            Err(_) => break,
19        };
20        let _ = stats_tx.send(num_read);
21        if write_tx.send(Vec::from(&buffer[..num_read])).is_err() {
22            break;
23        }
24    }
25    let _ = stats_tx.send(0);
26    let _ = write_tx.send(Vec::new());
27    Ok(())
28}
pipeviewer_exercise/read.rs

pipeviewer_exercise/
read.rs
