Method parse

crates/vm/src/stdlib/_io.rs:2571–2591

(cookie: &BigInt)

        const BYTE_LEN: usize = Self::BYTES_TO_SKIP_OFF + 4;

        fn parse(cookie: &BigInt) -> Option<Self> {
            let (_, mut buf) = cookie.to_bytes_le();
            if buf.len() > Self::BYTE_LEN {
                return None;
            }
            buf.resize(Self::BYTE_LEN, 0);
            let buf: &[u8; Self::BYTE_LEN] = buf.as_array()?;
            macro_rules! get_field {
                ($t:ty, $off:ident) => {
                    <$t>::from_ne_bytes(*buf[Self::$off..].first_chunk().unwrap())
                };
            }
            Some(Self {
                start_pos: get_field!(Offset, START_POS_OFF),
                dec_flags: get_field!(i32, DEC_FLAGS_OFF),
                bytes_to_feed: get_field!(i32, BYTES_TO_FEED_OFF),
                chars_to_skip: get_field!(i32, CHARS_TO_SKIP_OFF),
                need_eof: get_field!(u8, NEED_EOF_OFF) != 0,
                bytes_to_skip: get_field!(i32, BYTES_TO_SKIP_OFF),
            })
        }

        fn build(&self) -> BigInt {
            let mut buf = [0; Self::BYTE_LEN];