Function i64

pub fn i64<I, E: ParseError<I>>(
    endian: Endianness,
) -> fn(_: I) -> IResult<I, i64, E>
where
    I: Slice<RangeFrom<usize>> + InputIter<Item = u8> + InputLength,

Recognizes a signed 8 byte integer

If the parameter is nom::number::Endianness::Big, parse a big endian i64 integer, otherwise if nom::number::Endianness::Little parse a little endian i64 integer. complete version: returns an error if there is not enough input data

use nom::number::complete::i64;

let be_i64 = |s| {
  i64(nom::number::Endianness::Big)(s)
};

assert_eq!(be_i64(&b"\x00\x01\x02\x03\x04\x05\x06\x07abcefg"[..]), Ok((&b"abcefg"[..], 0x0001020304050607)));
assert_eq!(be_i64(&b"\x01"[..]), Err(Err::Error((&[0x01][..], ErrorKind::Eof))));

let le_i64 = |s| {
  i64(nom::number::Endianness::Little)(s)
};

assert_eq!(le_i64(&b"\x00\x01\x02\x03\x04\x05\x06\x07abcefg"[..]), Ok((&b"abcefg"[..], 0x0706050403020100)));
assert_eq!(le_i64(&b"\x01"[..]), Err(Err::Error((&[0x01][..], ErrorKind::Eof))));