Function i32

pub fn i32<Input, Error>(endian: Endianness) -> impl Parser<Input, i32, Error>
where
    Input: StreamIsPartial + Stream<Token = u8>,
    Error: ParserError<Input>,

Recognizes a signed 4 byte integer

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

Complete version: returns an error if there is not enough input data

[Partial version][crate::_topic::partial]: Will return Err(winnow::error::ErrMode::Incomplete(_)) if there is not enough data.

Example

use winnow::binary::i32;

fn be_i32(input: &mut &[u8]) -> ModalResult<i32> {
    i32(winnow::binary::Endianness::Big).parse_next(input)
};

assert_eq!(be_i32.parse_peek(&b"\x00\x03\x05\x07abcefg"[..]), Ok((&b"abcefg"[..], 0x00030507)));
assert!(be_i32.parse_peek(&b"\x01"[..]).is_err());

fn le_i32(input: &mut &[u8]) -> ModalResult<i32> {
    i32(winnow::binary::Endianness::Little).parse_next(input)
};

assert_eq!(le_i32.parse_peek(&b"\x00\x03\x05\x07abcefg"[..]), Ok((&b"abcefg"[..], 0x07050300)));
assert!(le_i32.parse_peek(&b"\x01"[..]).is_err());

use winnow::binary::i32;

fn be_i32(input: &mut Partial<&[u8]>) -> ModalResult<i32> {
    i32(winnow::binary::Endianness::Big).parse_next(input)
};

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

fn le_i32(input: &mut Partial<&[u8]>) -> ModalResult<i32> {
    i32(winnow::binary::Endianness::Little).parse_next(input)
};

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