asn1 0.24.1

ASN.1 (DER) parser and writer for Rust.
Documentation 
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#![no_std]

fn main() {
    let data = b"\x30\x06\x02\x01\x01\x02\x01\x03";

    let result: asn1::ParseResult<_> = asn1::parse(data, |d| {
        d.read_element::<asn1::Sequence>()?
            .parse(|d| Ok((d.read_element::<i64>()?, d.read_element::<i64>()?)))
    });

    // Using libc::printf because println! isn't no_std!
    match result {
        Ok((r, s)) => unsafe {
            libc::printf(c"r=%ld, s=%ld\n".as_ptr() as *const libc::c_char, r, s)
        },
        Err(_) => unsafe { libc::printf(c"Error\n".as_ptr() as *const libc::c_char) },
    };

    let computed = asn1::write(|w| {
        w.write_element(&asn1::SequenceWriter::new(&|w: &mut asn1::Writer| {
            w.write_element(&1i64)?;
            w.write_element(&3i64)?;
            Ok::<_, asn1::WriteError>(())
        }))
    })
    .unwrap();
    unsafe {
        libc::printf(
            c"Original length: %ld\nComputed length: %ld\n".as_ptr() as *const libc::c_char,
            data.len() as i64,
            computed.len() as i64,
        );
    }
}