STATUS_ACCESS_VIOLATION when writing vcgt tag

[vaisest]

I tried using this library to create a custom ICC profile with a custom VCGT. I have no clue if I'm using this library correctly, but I managed to produce a very confusing error with the following code:

use std::path::Path;

use lcms2::{Locale, Profile, Tag, ToneCurve, MLU};

fn main() {
    let mut icc = Profile::new_srgb();

    icc.remove_tag(lcms2::TagSignature::ProfileDescriptionTag);

    let mut desc = MLU::new(1);
    desc.set_text("Test ICC", Locale::none());
    icc.write_tag(lcms2::TagSignature::ProfileDescriptionTag, Tag::MLU(&desc));

    let tc = ToneCurve::new(2.0);

    let tc_refs: [&lcms2::ToneCurveRef; 3] = [&tc, &tc, &tc];
    let vcgt_tag = Tag::VcgtCurves(tc_refs);
    icc.write_tag(lcms2::TagSignature::VcgtTag, vcgt_tag);

    println!("saving profile to out.icc...");
    icc.save_profile_to_file(Path::new("out.icc")).expect("error while saving profile");
}

Running the program with lcms2 = 6.0.3 results in: error: process didn't exit successfully: 'target\debug\rs-lcms-test.exe' (exit code: 0xc0000005, STATUS_ACCESS_VIOLATION).

While I have no clue what I'm doing, I feel like the intent is not to crash in a way like this?

[kornelski]

Thanks for the report. Fixed in 3730909