lockbook-shared 0.9.4

the code shared between lb and our server
Documentation 
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const BYTE: u64 = 1;
const KILOBYTE: u64 = BYTE * 1000;
const MEGABYTE: u64 = KILOBYTE * 1000;
const GIGABYTE: u64 = MEGABYTE * 1000;
const TERABYTE: u64 = GIGABYTE * 1000;

const KILOBYTE_MINUS_ONE: u64 = KILOBYTE - 1;
const MEGABYTE_MINUS_ONE: u64 = MEGABYTE - 1;
const GIGABYTE_MINUS_ONE: u64 = GIGABYTE - 1;
const TERABYTE_MINUS_ONE: u64 = TERABYTE - 1;

pub fn bytes_to_human(size: u64) -> String {
    let (unit, abbr) = match size {
        0..=KILOBYTE_MINUS_ONE => (BYTE, "B"),
        KILOBYTE..=MEGABYTE_MINUS_ONE => (KILOBYTE, "KB"),
        MEGABYTE..=GIGABYTE_MINUS_ONE => (MEGABYTE, "MB"),
        GIGABYTE..=TERABYTE_MINUS_ONE => (GIGABYTE, "GB"),
        TERABYTE..=u64::MAX => (TERABYTE, "TB"),
    };

    let size_in_unit = size as f64 / unit as f64;
    let dec = f64::trunc(size_in_unit.fract() * 100.0) / 100.0;

    let num = format!("{:.2}", size_in_unit.trunc() + dec)
        .trim_end_matches(['0'])
        .trim_end_matches(['.'])
        .to_owned();

    format!("{} {}", num, abbr)
}