ByteSize

ByteSize is a utility for human-readable byte count representations.

Features:

• Pre-defined constants for various size units (e.g., B, Kb, Kib, Mb, Mib, Gb, Gib, ... PB).
• ByteSize type which presents size units convertible to different size units.
• Arithmetic operations for ByteSize.
• FromStr impl for ByteSize, allowing to parse from string size representations like 1.5KiB and 521TiB.
• Serde support for binary and human-readable deserializers like JSON.

API Documentation

Examples

Human readable representations (SI unit and Binary unit)

fn assert_display(expected: &str, b: ByteSize) {
    assert_eq!(expected, format!("{}", b));
}

#[test]
fn test_display() {
    assert_display("215 B", ByteSize::b(215));
    assert_display("1.0 KiB", ByteSize::kib(1));
    assert_display("301.0 KiB", ByteSize::kib(301));
    assert_display("419.0 MiB", ByteSize::mib(419));
    assert_display("518.0 GiB", ByteSize::gib(518));
    assert_display("815.0 TiB", ByteSize::tib(815));
    assert_display("609.0 PiB", ByteSize::pib(609));
}

#[test]
fn test_display_alignment() {
    assert_eq!("|357 B     |", format!("|{:10}|", ByteSize(357)));
    assert_eq!("|     357 B|", format!("|{:>10}|", ByteSize(357)));
    assert_eq!("|357 B     |", format!("|{:<10}|", ByteSize(357)));
    assert_eq!("|  357 B   |", format!("|{:^10}|", ByteSize(357)));

    assert_eq!("|-----357 B|", format!("|{:->10}|", ByteSize(357)));
    assert_eq!("|357 B-----|", format!("|{:-<10}|", ByteSize(357)));
    assert_eq!("|--357 B---|", format!("|{:-^10}|", ByteSize(357)));
}

fn assert_to_string(expected: &str, b: ByteSize, si: bool) {
    assert_eq!(expected.to_string(), b.to_string_as(si));
}

#[test]
fn test_to_string_as() {
    assert_to_string("215 B", ByteSize::b(215), true);
    assert_to_string("215 B", ByteSize::b(215), false);

    assert_to_string("1.0 KiB", ByteSize::kib(1), true);
    assert_to_string("1.0 KB", ByteSize::kib(1), false);

    assert_to_string("293.9 KiB", ByteSize::kb(301), true);
    assert_to_string("301.0 KB", ByteSize::kb(301), false);

    assert_to_string("1.0 MiB", ByteSize::mib(1), true);
    assert_to_string("1048.6 KB", ByteSize::mib(1), false);

    // a bug case: https://github.com/flang-project/bytesize/issues/8
    assert_to_string("1.9 GiB", ByteSize::mib(1907), true);
    assert_to_string("2.0 GB", ByteSize::mib(1908), false);

    assert_to_string("399.6 MiB", ByteSize::mb(419), true);
    assert_to_string("419.0 MB", ByteSize::mb(419), false);

    assert_to_string("482.4 GiB", ByteSize::gb(518), true);
    assert_to_string("518.0 GB", ByteSize::gb(518), false);

    assert_to_string("741.2 TiB", ByteSize::tb(815), true);
    assert_to_string("815.0 TB", ByteSize::tb(815), false);

    assert_to_string("540.9 PiB", ByteSize::pb(609), true);
    assert_to_string("609.0 PB", ByteSize::pb(609), false);
}

Arithmetic Operations

use bytesize::ByteSize;

fn byte_arithmetic_operator() {
  let x = ByteSize::mb(1);
  let y = ByteSize::kb(100);

  let plus = x + y;
  print!("{}", plus);

  let minus = ByteSize::tb(100) + ByteSize::gb(4);
  print!("{}", minus);
}