Support for AEC/CCSDS Compression (DRT 5.42)

[EricEngle-NOAA]

Pull request for issue #424.

Changes in this pull request provide support for AEC/CCSDS compression in the g2c library as specified by DRT 5.42.

Tests have been created (tests/tst_aec.c) and are successful on my Fedora 38 VM (gcc 13.2)

[EricEngle-NOAA]

Nice! Do you want me to merge this in before the 1.8.0 releaase?

@edwardhartnett - When are you planning to release v1.8.0?

[edwardhartnett]

I'm planning on releasing 1.8.0 today or early next week...

[EricEngle-NOAA]

There were a couple of failed tests that I am working through. Does not seem major -- type mismatches. Going to push fixes soon.

[edwardhartnett]

This is happening on MacOS:

/Users/runner/work/NCEPLIBS-g2c/NCEPLIBS-g2c/g2c/tests/tst_aec.c:9:10: fatal error: 'libaec.h' file not found

include

Do you know how to install the AEC library on MacOS?

[EricEngle-NOAA]

Yes. I am working on the missing aec header for macOS now.

I think it will be best to release early next week if the desire is to get AEC support in v1.8.0

[EricEngle-NOAA]

Yay the macOS tests are passing with commit 16499e3

Now onto the Linux options tests

[edwardhartnett]

Next week is fine. I'm not ready yet... ;-)

[edwardhartnett]

Also do you have any real-world examples of data files compressed with AEC?

[edwardhartnett]

What is happening with the CI here? How come nothing is running?

[EricEngle-NOAA]

Hmmm... I did put [skip ci] in the last commit message for .gitignore.

[EricEngle-NOAA]

These 8 jobs do not have aec parameters, so something got messed up somewhere. Still looking...

[EricEngle-NOAA]

@edwardhartnett - I think somewhere in the GitHub CI, these 8 checks are "required", but these test do not exist anymore since I modified Linux_options and MacOS to include AEC parameters. In other words, these tests don't exist anymore, but they are required.

[edwardhartnett]

OK, I forgot that you modified the tests. Stand by...

[EricEngle-NOAA]

🎉 Looks good! 🎉

[edwardhartnett]

@EricEngle-NOAA I'm going to merge this. Thanks very much for this contribution, it will benefit many other users as well.

Could you please find some smallish real-world data file that uses this kind of packing, so we can have a test file on our FTP site?

[EricEngle-NOAA]

@edwardhartnett - It's been hard to find, but I can generate it. How many messages and what size limit should I consider?

[edwardhartnett]

Some small file would be good, so just a couple of messages...