Function winnow::number::u64

pub fn u64<I, E: ParseError<I>>(
    endian: Endianness
) -> impl FnMut(I) -> IResult<I, u64, E>where
    I: StreamIsPartial + Stream<Token = u8>,
    <I as Stream>::Slice: AsBytes,

Recognizes an unsigned 8 byte integer

If the parameter is winnow::number::Endianness::Big, parse a big endian u64 integer, otherwise if winnow::number::Endianness::Little parse a little endian u64 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::number::u64;

let be_u64 = |s| {
  u64(winnow::number::Endianness::Big)(s)
};

assert_eq!(be_u64(&b"\x00\x01\x02\x03\x04\x05\x06\x07abcefg"[..]), Ok((&b"abcefg"[..], 0x0001020304050607)));
assert_eq!(be_u64(&b"\x01"[..]), Err(ErrMode::Backtrack(Error::new(&[0x01][..], ErrorKind::Eof))));

let le_u64 = |s| {
  u64(winnow::number::Endianness::Little)(s)
};

assert_eq!(le_u64(&b"\x00\x01\x02\x03\x04\x05\x06\x07abcefg"[..]), Ok((&b"abcefg"[..], 0x0706050403020100)));
assert_eq!(le_u64(&b"\x01"[..]), Err(ErrMode::Backtrack(Error::new(&[0x01][..], ErrorKind::Eof))));

use winnow::number::u64;

let be_u64 = |s| {
  u64::<_, Error<_>>(winnow::number::Endianness::Big)(s)
};

assert_eq!(be_u64(Partial::new(&b"\x00\x01\x02\x03\x04\x05\x06\x07abcefg"[..])), Ok((Partial::new(&b"abcefg"[..]), 0x0001020304050607)));
assert_eq!(be_u64(Partial::new(&b"\x01"[..])), Err(ErrMode::Incomplete(Needed::new(7))));

let le_u64 = |s| {
  u64::<_, Error<_>>(winnow::number::Endianness::Little)(s)
};

assert_eq!(le_u64(Partial::new(&b"\x00\x01\x02\x03\x04\x05\x06\x07abcefg"[..])), Ok((Partial::new(&b"abcefg"[..]), 0x0706050403020100)));
assert_eq!(le_u64(Partial::new(&b"\x01"[..])), Err(ErrMode::Incomplete(Needed::new(7))));