Function winnow::binary::be_u8

pub fn be_u8<I, E: ParserError<I>>(input: &mut I) -> PResult<u8, E>
where
    I: StreamIsPartial + Stream<Token = u8>,

Recognizes an unsigned 1 byte integer.

Complete version: Returns an error if there is not enough input data.

Partial version: Will return Err(winnow::error::ErrMode::Incomplete(_)) if there is not enough data.

Example

use winnow::binary::be_u8;

fn parser(s: &[u8]) -> IResult<&[u8], u8> {
    be_u8.parse_peek(s)
}

assert_eq!(parser(&b"\x00\x03abcefg"[..]), Ok((&b"\x03abcefg"[..], 0x00)));
assert_eq!(parser(&b""[..]), Err(ErrMode::Backtrack(InputError::new(&[][..], ErrorKind::Token))));

use winnow::binary::be_u8;

fn parser(s: Partial<&[u8]>) -> IResult<Partial<&[u8]>, u8> {
    be_u8.parse_peek(s)
}

assert_eq!(parser(Partial::new(&b"\x00\x01abcd"[..])), Ok((Partial::new(&b"\x01abcd"[..]), 0x00)));
assert_eq!(parser(Partial::new(&b""[..])), Err(ErrMode::Incomplete(Needed::new(1))));