Function nom::number::complete::u64

source ยท 
pub fn u64<I, E: ParseError<I>>(
    endian: Endianness,
) -> fn(_: I) -> IResult<I, u64, E>
where
    I: Slice<RangeFrom<usize>> + InputIter<Item = u8> + InputLength,
Expand description

Recognizes an unsigned 8 byte integer

If the parameter is nom::number::Endianness::Big, parse a big endian u64 integer, otherwise if nom::number::Endianness::Little parse a little endian u64 integer. complete version: returns an error if there is not enough input data

use nom::number::complete::u64;

let be_u64 = |s| {
  u64(nom::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(Err::Error((&[0x01][..], ErrorKind::Eof))));

let le_u64 = |s| {
  u64(nom::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(Err::Error((&[0x01][..], ErrorKind::Eof))));