Function nom::number::streaming::be_u64

pub fn be_u64<I, E: ParseError<I>>(input: I) -> IResult<I, u64, E> where
    I: Slice<RangeFrom<usize>> + InputIter<Item = u8> + InputLength, 

Recognizes a big endian unsigned 8 bytes integer

streaming version: will return Err(nom::Err::Incomplete(_)) if there is not enough data

use nom::number::streaming::be_u64;

let parser = |s| {
  be_u64::<_, (_, ErrorKind)>(s)
};

assert_eq!(parser(&b"\x00\x01\x02\x03\x04\x05\x06\x07abcd"[..]), Ok((&b"abcd"[..], 0x0001020304050607)));
assert_eq!(parser(&b"\x01"[..]), Err(Err::Incomplete(Needed::new(7))));