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How to initialize OCTETSTRING from char* in an external function? [message #1786671]

Wed, 09 May 2018 07:57

Dorian K

Messages: 2
Registered: May 2018

Junior Member

HI,

I want to implement an external function that's retuning an OCTETSTRING. This function reads a HEX String as a char*. I want to turn this char* into an OCTETSTRING also representing this HEX-String. So chr2oct doesn't to the trick. Coming from a TTWB world I'm used to a constructor that allows to enter a String as Parameter to initialize an OCTETSTRING. How does it work in titan?

BR Dorian

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Re: How to initialize OCTETSTRING from char* in an external function? [message #1786692 is a reply to message #1786671]

Wed, 09 May 2018 14:00

Gábor Szalai

Messages: 133
Registered: December 2015

Senior Member

Hi,

Does the "HEX String" mean something like: "AA1245CB" ? string using hexadecimal characters? Does it stored as null terminated C string?

If yes you can use the str2oct() function directly.

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Re: How to initialize OCTETSTRING from char* in an external function? [message #1786731 is a reply to message #1786671]

Thu, 10 May 2018 05:30

Kristof Szabados

Messages: 60
Registered: July 2015

Member

Hi,

If your char* already contains the hex values you can also use the OCTETSTRING constructor.

for example if you have something like this in your code: "var octetstring temp := '12AB'O;"

Titan will generate a code like this for it:
unsigned char os_0_octets[] = { 18, 171 };
OCTETSTRING temp(2, os_0_octets);

Please note that the original text visible in TTCN-3 is already translated to char[] representation in advance. This is a fast way if you already have your characters like this.

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Re: How to initialize OCTETSTRING from char* in an external function? [message #1786780 is a reply to message #1786731]

Fri, 11 May 2018 09:33

Dorian K

Messages: 2
Registered: May 2018

Junior Member

Thanks for your answers.
str2oct worked in my case, I just had to replace the line break at the last position with the null terminator.
The hexstrings are being read from a text file and the lines are containing hexadecimal values like: "AA1245CB".

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