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lu_zero February 2016

Which is the quickest, safe or unsafe, way to read 16, 32, 64 bit integers from a &u8[] in Rust?

Assume you have a slice and you want to read little and big endian integers from it. Is there a better way than to use unsafe pointers?

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fjh February 2016

You could use the byteorder crate. For some usage examples, see the docs.

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());

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Asked in February 2016
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