Function be_u24

pub fn be_u24<I, E: ParseError<I>>() -> impl Parser<I, Output = u32, Error = E>
where
    I: Input<Item = u8>,

Recognizes a big endian unsigned 3 byte integer.

use nom::number::be_u24;

let parser = |s| {
  be_u24::<_, (_, ErrorKind)>().parse(s)
};

assert_eq!(parser(&b"\x00\x01\x02abcd"[..]), Ok((&b"abcd"[..], 0x000102)));
assert_eq!(parser(&b"\x01"[..]), Err(Err::Incomplete(Needed::new(2))));