FYI: upstream asn1c progress

Hi all, upstream asn1c (https://github.com/vlm/asn1c) has made significant progress in 2017. It now has basic support for information object classes, and while doing some S1AP related test I also could compile an unmodified RANAP ASN.1 syntax from osmo-iuh.git commit 8f2fb0cca5f990b26478e9ec1207fa1e39e691eb - i.e. before all the various rewrites and hacks that we added to make it pass the much older asn1c that we were using at the time. In case anyone wants to play with this, I've had success with asn1c up to git commit https://github.com/vlm/asn1c/commit/e700b208bc0b252c85390a80ee63f3687fb2d970 until https://github.com/vlm/asn1c/commit/ea6635bdae9667bcf6111a25d896c556c946c11a unfortunately introduces a regression that's tracked in https://github.com/vlm/asn1c/issues/185 Resolving that regression seems like it requires quite a bit of insight into asn1c internals, which nobody in Osmocom currently has. What's still missing from upstream is APER support. Sadly, he maintainer @vlm states clearly that APER is not a short-term goal for him. However, ss UPER is supported, and there's the somewhat incomplete Eurecom/OAI hacks (with our fixes on top) as well as work in the following pull-request https://github.com/vlm/asn1c/pull/125 I don't think that's such a big issue anymore. It would be best to create somewhat of a test suite and then get the APER code up to a state until it passes that test suite. I'd be happy to put some of my (or sysmocom developer) time into that. But assuming that the regression parsing/compiling the ASN.1 syntax can somehow be fixed, I think there's some clear "light at the end of the tunnel" that we could compile the 3GPP syntax for RUA, HNBAP, RANAP and S1AP as-is, without first rewriting it, and without the asn1tostruct.py hack. Regards, Harald -- - Harald Welte <laforge(a)gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)