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I am trying to generate C code for the GSM-TCAP asn1 files obtained from libosmo-asn1-TCAP. I have installed the osmocom libasnc1 compiler (tried both master and aper-prefix branches) and run this code:

asn1c -fcompound-names -gen-PER 
       DialoguePDUs.asn 
       tcap.asn 
       TCAPMessages.asn 
       TC-Notation-Extensions.asn 
       UnidialoguePDUs.asn

However, the compiler reports the following syntax error:

ASN.1 grammar parse error near line 86 (token "returnResult"): syntax error, 
unexpected TOK_identifier Cannot parse "TCAPMessages.asn"

Does anyone know the root of this problem, and how to resolve it?

Abolfazl Diyanat
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1 Answers1

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You don't need to compile all asn files in asn sub-directory. There is a rebuild script that you could use.

asn1c $ASN/DialoguePDUs.asn $ASN/tcap.asn $ASN/UnidialoguePDUs.asn

The other files contain syntax that is not supported by asn1c and some of them were rewritten to not use such syntax and some are not needed at all.

Vasil Velichkov
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  • Vasko, thanks for your answer. Are these three files sufficient to implement the normal procedures in the mobile Core Network? It would be great if you could also help in the regard of this [related question](https://stackoverflow.com/questions/53632962/problem-in-compiling-c-code-generated-by-the-osmocom-asn1c) – Abolfazl Diyanat Dec 05 '18 at 13:05
  • I believe they are sufficient – Vasil Velichkov Dec 05 '18 at 15:58