human_readable/
lib.rs

1use std::cmp;
2
3const DELIMITER: f64 = 1000_f64;
4const UNITS: &[&str] = &["B", "kB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"];
5
6/// Converts the number of bytes to a human-readable string.
7/// ref. https://github.com/banyan/rust-pretty-bytes/blob/master/src/converter.rs
8pub fn bytes(n: f64) -> String {
9    let sign = if n.is_sign_positive() { "" } else { "-" };
10    let n = n.abs();
11    if n < 1_f64 {
12        return format!("{}{} {}", sign, n, "B");
13    }
14    let exp = cmp::min(
15        (n.ln() / DELIMITER.ln()).floor() as i32,
16        (UNITS.len() - 1) as i32,
17    );
18    let bytes = format!("{:.2}", n / DELIMITER.powi(exp))
19        .parse::<f64>()
20        .unwrap()
21        * 1_f64;
22    let unit = UNITS[exp as usize];
23    format!("{}{} {}", sign, bytes, unit)
24}
25
26#[test]
27fn test_humanize_bytes() {
28    assert!(bytes(100000.0) == "100 kB");
29    assert!(bytes(490652508160.0) == "490.65 GB");
30    assert!(bytes(252868079616.0) == "252.87 GB");
31    assert!(bytes(227876253696.0) == "227.88 GB");
32}
human_readable/lib.rs

human_readable/
lib.rs
