Function rocket::mtls::oid::asn1_rs::nom::number::streaming::u16

source · 
pub fn u16<I, E>(endian: Endianness) -> fn(_: I) -> Result<(I, u16), Err<E>>
where
    E: ParseError<I>,
    I: Slice<RangeFrom<usize>> + InputIter<Item = u8> + InputLength,
Available on crate feature mtls only.
Expand description

Recognizes an unsigned 2 bytes integer

If the parameter is nom::number::Endianness::Big, parse a big endian u16 integer, otherwise if nom::number::Endianness::Little parse a little endian u16 integer. Streaming version: Will return Err(nom::Err::Incomplete(_)) if there is not enough data.

use nom::number::streaming::u16;

let be_u16 = |s| {
  u16::<_, (_, ErrorKind)>(nom::number::Endianness::Big)(s)
};

assert_eq!(be_u16(&b"\x00\x03abcefg"[..]), Ok((&b"abcefg"[..], 0x0003)));
assert_eq!(be_u16(&b"\x01"[..]), Err(Err::Incomplete(Needed::new(1))));

let le_u16 = |s| {
  u16::<_, (_, ErrorKind)>(nom::number::Endianness::Little)(s)
};

assert_eq!(le_u16(&b"\x00\x03abcefg"[..]), Ok((&b"abcefg"[..], 0x0300)));
assert_eq!(le_u16(&b"\x01"[..]), Err(Err::Incomplete(Needed::new(1))));