Function winnow::number::i32

pub fn i32<I, E: ParseError<I>>(
    endian: Endianness
) -> impl FnMut(I) -> IResult<I, i32, E>where
    I: StreamIsPartial + Stream<Token = u8>,
    <I as Stream>::Slice: AsBytes,

Recognizes a signed 4 byte integer

If the parameter is winnow::number::Endianness::Big, parse a big endian i32 integer, otherwise if winnow::number::Endianness::Little parse a little endian i32 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::number::i32;

let be_i32 = |s| {
  i32(winnow::number::Endianness::Big)(s)
};

assert_eq!(be_i32(&b"\x00\x03\x05\x07abcefg"[..]), Ok((&b"abcefg"[..], 0x00030507)));
assert_eq!(be_i32(&b"\x01"[..]), Err(ErrMode::Backtrack(Error::new(&[0x01][..], ErrorKind::Eof))));

let le_i32 = |s| {
  i32(winnow::number::Endianness::Little)(s)
};

assert_eq!(le_i32(&b"\x00\x03\x05\x07abcefg"[..]), Ok((&b"abcefg"[..], 0x07050300)));
assert_eq!(le_i32(&b"\x01"[..]), Err(ErrMode::Backtrack(Error::new(&[0x01][..], ErrorKind::Eof))));

use winnow::number::i32;

let be_i32 = |s| {
  i32::<_, Error<_>>(winnow::number::Endianness::Big)(s)
};

assert_eq!(be_i32(Partial::new(&b"\x00\x03\x05\x07abcefg"[..])), Ok((Partial::new(&b"abcefg"[..]), 0x00030507)));
assert_eq!(be_i32(Partial::new(&b"\x01"[..])), Err(ErrMode::Incomplete(Needed::new(3))));

let le_i32 = |s| {
  i32::<_, Error<_>>(winnow::number::Endianness::Little)(s)
};

assert_eq!(le_i32(Partial::new(&b"\x00\x03\x05\x07abcefg"[..])), Ok((Partial::new(&b"abcefg"[..]), 0x07050300)));
assert_eq!(le_i32(Partial::new(&b"\x01"[..])), Err(ErrMode::Incomplete(Needed::new(3))));