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

[Byron Campen <bcampen@xxxxxxxxxxxx>]

	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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