Function winnow::binary::u64

source · 
pub fn u64<Input, Error>(endian: Endianness) -> impl Parser<Input, u64, Error>
where
    Input: StreamIsPartial + Stream<Token = u8>,
    Error: ParserError<Input>,
Expand description

Recognizes an unsigned 8 byte integer

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

let be_u64 = |s| {
    u64(winnow::binary::Endianness::Big).parse_peek(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(InputError::new(&[0x01][..], ErrorKind::Slice))));

let le_u64 = |s| {
    u64(winnow::binary::Endianness::Little).parse_peek(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(InputError::new(&[0x01][..], ErrorKind::Slice))));
use winnow::binary::u64;

let be_u64 = |s| {
    u64::<_, InputError<_>>(winnow::binary::Endianness::Big).parse_peek(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::<_, InputError<_>>(winnow::binary::Endianness::Little).parse_peek(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))));