Function u24

pub fn u24<I, E: ParseError<I>>(
    endian: Endianness,
) -> impl Parser<I, Output = u32, Error = E>
where
    I: Input<Item = u8>,

Recognizes an unsigned 3 byte integer

If the parameter is nom::number::Endianness::Big, parse a big endian u24 integer, otherwise if nom::number::Endianness::Little parse a little endian u24 integer.

use nom::number::u24;

let be_u24 = |s| {
  u24::<_,(_, ErrorKind)>(nom::number::Endianness::Big).parse(s)
};

assert_eq!(be_u24(&b"\x00\x03\x05abcefg"[..]), Ok((&b"abcefg"[..], 0x000305)));
assert_eq!(be_u24(&b"\x01"[..]), Err(Err::Incomplete(Needed::new(2))));

let le_u24 = |s| {
  u24::<_, (_, ErrorKind)>(nom::number::Endianness::Little).parse(s)
};

assert_eq!(le_u24(&b"\x00\x03\x05abcefg"[..]), Ok((&b"abcefg"[..], 0x050300)));
assert_eq!(le_u24(&b"\x01"[..]), Err(Err::Incomplete(Needed::new(2))));