Re: [reSIProcate-users] ExtensionHeader and comma-separated addr-spec

["Alfred E. Heggestad" <aeh@xxxxxx>]

Hi Byron

many thanks for your advice!

I ended up using ParseBuffer as you mentioned, and managed to get the following
piece of code working:


                    for (StringCategories::iterator i = sc.begin(); i != 
sc.end(); ++i) {
                        const StringCategory &s = *i;

                        /* One Foo header can contain many
                           nameaddr values, so we must parse it */

                        ParseBuffer pb(s.value());

                        for (int i=0; !pb.eof() && i<32; i++) {
                            NameAddr na;
                            stringstream ss;

                            na.parse(pb);

                            ss << na;

                            printf("Foo %d: \"%s\"\n", i, ss.str().c_str());
                        }
                    }



/alfred

Byron Campen wrote:
>     Comma doesn't mean anything special in an extension header. (see RFC 
> 3261 BNF for more on this) As an example, the following is a valid, 
> _single-value_, extension-header:
>
> *snip*
> UnknownHeaderWithUnusualValue: ;;,,;;,;
> *snip*
>
>     You'll need to parse them out yourself, and ParseBuffer will 
> probably be the tool you'll need to tokenize based on commas.
>
> Best regards,
> Byron Campen
>
> > Hi
> >
> > I am facing a problem where I need to parse multiple comma-separated
> > addresses from an extension header. The problem is that if there are
> > multiple addr-spec values in one header, the parser is not able
> > to split the values.
> >
> > Consider the following code example:
> >
> >
> >                const ExtensionHeader h_fooHeader("P-FooHeader");
> >
> >                if (msg->exists(h_fooHeader)) {
> >
> >                    StringCategories &sc = msg->header(h_fooHeader);
> >
> >                    for (StringCategories::iterator i = sc.begin(); i 
> > != sc.end(); ++i) {
> >                        const StringCategory &s = *i;
> >                        const Data foo(s.value());
> >
> >                        printf("got foo-header: %s\n", foo.c_str());
> >                    }
> >               }
> >
> >
> > this code works for SIP messages like:
> >
> >  P-FooHeader: <sip:foo@xxxxxxxxxxx>;param=1
> >  P-FooHeader: <sip:bar@xxxxxxxxxxx>;param=2
> >
> > which will print out the two header entries.
> >
> >
> > But this code is not working for SIP messages like this:
> >
> >  P-FooHeader: <sip:foo@xxxxxxxxxxx>;param=1, 
> > <sip:baz@xxxxxxxxxxx>;param=0
> >  P-FooHeader: <sip:bar@xxxxxxxxxxx>;param=2
> >
> >
> > For my extension header I would like to parse and validate that the
> > content (Addr-Spec) is correct. For this I assume that NameAddr is the
> > best class to use.
> >
> >
> > How can I put the content of a StringCategory value into a new
> > NameAddr value, and iterate over all address fields inside the value?
> > I have looked at the documentation, but it does not mention this
> > special case. Are there any places in the code where similar stuff
> > is done?
> >
> > Thanks in advance for any help!
> >
> >
> > /alfred
> >
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