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.
Streaming version: Will return Err(nom::Err::Incomplete(_))
if there is not enough data.
use nom::number::streaming::u64;
let be_u64 = |s| {
u64::<_, (_, ErrorKind)>(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::Incomplete(Needed::new(7))));
let le_u64 = |s| {
u64::<_, (_, ErrorKind)>(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::Incomplete(Needed::new(7))));