created_at2018-07-29 16:02:36.504424
updated_at2024-01-23 12:14:23.976786
descriptionA library for interacting with units of bytes.
Magic Len (Ron Li) (magiclen)



Byte Unit


A library for interaction with units of bytes.

The units are B for 1 byte, KB for 1000 bytes, MiB for 1048576 bytes, GB for 1000000000 bytes, etc, and up to E or Y (if the u128 feature is enabled).


The data types for storing the size in bits/bytes are u64 by default, meaning the highest supported unit is up to E. If the u128 feature is enabled, the data types will use u128, increasing the highest supported unit up to Y.


The enum Unit can be used for representing the unit of bits/bytes.

use byte_unit::Unit;

assert_eq!("KB", Unit::KB.as_str());
assert_eq!("MiB", Unit::MiB.as_str());

assert_eq!(Unit::KB, Unit::parse_str("K", true, true).unwrap());
assert_eq!(Unit::Kbit, Unit::parse_str("K", true, false).unwrap());

assert_eq!(Unit::KB, Unit::parse_str("KB", true, true).unwrap());
assert_eq!(Unit::KB, Unit::parse_str("Kb", true, true).unwrap());
assert_eq!(Unit::Kbit, Unit::parse_str("Kbit", true, true).unwrap());

assert_eq!(Unit::KB, Unit::parse_str("KB", false, true).unwrap());
assert_eq!(Unit::Kbit, Unit::parse_str("Kb", false, true).unwrap());


The Byte struct can be used for representing a size in bytes.

The from_* associated functions can be used to create a Byte instance from different data types. The as_* methods can retrieve the size as a primitive type.

use byte_unit::{Byte, Unit};

assert_eq!(15000, Byte::from_u64(15000).as_u64());
assert_eq!(15000, Byte::from_u64_with_unit(15, Unit::KB).unwrap().as_u64());

You can also parse a string to create a Byte instance.

use byte_unit::Byte;

assert_eq!(50840000, Byte::parse_str("50.84 MB", true).unwrap().as_u64());

A Byte instance can be formatted to string precisely. For more detailed usage, please refer to the implementation documentation of Display::fmt for Byte.

use byte_unit::Byte;

let byte = Byte::from_u64(15500);

assert_eq!("15500", byte.to_string());

assert_eq!("15.5 KB", format!("{byte:#}"));
assert_eq!("15500 B", format!("{byte:#.0}"));


There are add, subtract, multiply, and divide methods.

use byte_unit::Byte;

let a = Byte::from_u64(15500);
let b = Byte::from_u64(500);

assert_eq!(16000, a.add(b).unwrap().as_u64());
assert_eq!(15000, a.subtract(b).unwrap().as_u64());

assert_eq!(31000, a.multiply(2).unwrap().as_u64());
assert_eq!(3100, a.divide(5).unwrap().as_u64());

Find Out an Appropriate Unit

The get_exact_unit and get_recoverable_unit methods is useful if you want to find out a unit that is appropriate for a Byte instance.

use byte_unit::{Byte, Unit};

let byte = Byte::from_u64(50840000);

assert_eq!((50840, Unit::KB), byte.get_exact_unit(false));
assert_eq!((50.84f64.try_into().unwrap(), Unit::MB), byte.get_recoverable_unit(false, 2));
assert_eq!((50840.into(), Unit::KB), byte.get_recoverable_unit(false, 0));


The AdjustedByte struct can be used for roughly representing a size of bytes with a unit.

To change the unit of a Byte instance, you can use the get_adjusted_unit method.

An AdjustedByte instance can be formatted to string. For more detailed usage, please refer to the implementation documentation of Display::fmt for AdjustedByte.

use byte_unit::{Byte, Unit};

let byte = Byte::parse_str("123KiB", true).unwrap();

let adjusted_byte = byte.get_adjusted_unit(Unit::KB);

assert_eq!("125.952 KB", adjusted_byte.to_string());
assert_eq!("125.95 KB", format!("{adjusted_byte:.2}"));

The get_appropriate_unit method can be used to automatically find an appropriate unit for creating an AdjustedByte instance.

use byte_unit::{Byte, Unit, UnitType};

let byte = Byte::from_u64(1500000);

let adjusted_byte = byte.get_appropriate_unit(UnitType::Binary);

assert_eq!("1.43 MiB", format!("{adjusted_byte:.2}"));


The Bit struct can be used for representing a size in bits.

The bit feature must be enabled.

Usage of the Bit struct and the Byte struct is very similar. Also, There is the AdjustedBit struct. The difference lies in the fact that the parse_str method of the Bit struct cannot be configured to ignore case; it always does not ignore case.

use byte_unit::{Bit, Unit};

let bit = Bit::parse_str("123Kib").unwrap();

let adjusted_bit = bit.get_adjusted_unit(Unit::Kbit);

assert_eq!("125.952 Kb", adjusted_bit.to_string());
assert_eq!("125.95 Kb", format!("{adjusted_bit:.2}"));

No Std

Disable the default features to compile this crate without std.

version = "*"
default-features = false
features = ["byte"]

Serde Support

Enable the serde feature to support the serde framework.

version = "*"
features = ["serde"]

Rocket Support

Enable the rocket feature to support the Rocket framework.

version = "*"
features = ["rocket"]




Commit count: 101

cargo fmt