byteorder-core2

This crate is based on byteorder PR 184 that adds some support for core2. I need it for one of libraries to be no_std. I will passively try to keep this up to date with byteorder, but I apologize if I forget to. Feel free to contact me if you would like to take over.

lib.rs:

This crate provides convenience methods for encoding and decoding numbers in either big-endian or little-endian order.

The organization of the crate is pretty simple. A trait, ByteOrder, specifies byte conversion methods for each type of number in Rust (sans numbers that have a platform dependent size like usize and isize). Two types, BigEndian and LittleEndian implement these methods. Finally, ReadBytesExt and WriteBytesExt provide convenience methods available to all types that implement Read and Write.

An alias, NetworkEndian, for BigEndian is provided to help improve code clarity.

An additional alias, NativeEndian, is provided for the endianness of the local platform. This is convenient when serializing data for use and conversions are not desired.

Examples

Read unsigned 16 bit big-endian integers from a Read type:

use std::io::Cursor;
use byteorder::{BigEndian, ReadBytesExt};

let mut rdr = Cursor::new(vec![2, 5, 3, 0]);
// Note that we use type parameters to indicate which kind of byte order
// we want!
assert_eq!(517, rdr.read_u16::<BigEndian>().unwrap());
assert_eq!(768, rdr.read_u16::<BigEndian>().unwrap());

Write unsigned 16 bit little-endian integers to a Write type:

use byteorder::{LittleEndian, WriteBytesExt};

let mut wtr = vec![];
wtr.write_u16::<LittleEndian>(517).unwrap();
wtr.write_u16::<LittleEndian>(768).unwrap();
assert_eq!(wtr, vec![5, 2, 0, 3]);

Optional Features

This crate optionally provides support for 128 bit values (i128 and u128) when built with the i128 feature enabled.

This crate can also be used without the standard library.

Alternatives

Note that as of Rust 1.32, the standard numeric types provide built-in methods like to_le_bytes and from_le_bytes, which support some of the same use cases.