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use asn1_rs::*;
use hex_literal::hex;
// XXX limitation:
// when OPTIONAL only (and not tagged), parser is eager:
// if there are several values of the same type, the first one
// goes to the OPTIONAL value (and will fail if the next value is not present and mandatory)
#[derive(Debug, PartialEq, DerSequence)]
// #[debug_derive]
pub struct T0 {
a: u16,
#[optional]
b: Option<u16>,
}
#[derive(Debug, PartialEq, DerSequence)]
// #[debug_derive]
pub struct T1 {
#[tag_explicit(0)]
#[optional]
a: Option<u16>,
}
fn main() {
// optional value present
let input0 = &hex!("3006 020103 020103");
let (rem, t0) = T0::from_der(input0).expect("parsing failed");
assert!(rem.is_empty());
assert_eq!(t0, T0 { a: 3, b: Some(3) });
// optional value absent
let input1 = &hex!("3003 020103");
let (rem, t0) = T0::from_der(input1).expect("parsing failed");
assert!(rem.is_empty());
assert_eq!(t0, T0 { a: 3, b: None });
// optional value present but wrong tag
let input_wrong_tag = &hex!("3008 a103020103 020103");
T0::from_der(input_wrong_tag).expect_err("parsing should fail");
// optional value present but invalid length
let input_wrong_len0 = &hex!("3008 a002020103 020103");
T0::from_der(input_wrong_len0).expect_err("parsing should fail");
let input_wrong_len1 = &hex!("3008 a003020403 020103");
T0::from_der(input_wrong_len1).expect_err("parsing should fail");
// test empty input
let input_empty = &hex!("3000");
let (rem, t1) = T1::from_der(input_empty).expect("parsing failed");
assert!(rem.is_empty());
assert_eq!(t1, T1 { a: None });
}
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