Parse-back not working

[robybeen]

Either I don't undestand how the lib should be used or there is some fishy stuff in the code. This example should serialize an empty value and parse it back, but Tlv::from_vec returns an error:

use tlv_parser::tlv::{Tlv, Value};

fn main() {
    let src = Tlv::new(0x1F, Value::Nothing).unwrap();
    let output = src.to_vec();
    let dest = Tlv::from_vec(&output).unwrap();
    assert_eq!(dest.tag(), 0x1F);
}

Output:

thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: TruncatedTlv', src/main.rs:6:39
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

[lexxvir]

Hi @robybeen ,

In your case there is an error in the tag number. BER-TLV rules imply that if most-significant-byte of a tag number masked by 0x1F is equal to 0x1F (tag & 0x1F == 0x1F) then tag number is consist of at least two bytes. In your case tag number is one byte size.

Now Tlv::new doesn't check the tag number provided by user. I will add such a check.