Ethereal-dev: Re: [Ethereal-dev] problem in pseudo header problem sorted out (but reasoning is

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From: "Raman Singla" <ramans@xxxxxxxxxxxxxxxxxxx>
Date: Tue, 30 May 2006 10:34:29 +0530
Thanks Mr. Ravi the problem is sorted out by this but i still can't figure out why is it so.
whereas pseudo_header-> or wtap->pseudo_header. is one & same thing
 
when i did with pseudo_header-> it worked out.
 
thank you Mr. Ravi.
----- Original Message -----
Sent: 2006 May 30 8:14 AM
Subject: Re: [Ethereal-dev] problem in pseudo header

seek_read() function has
   wtap* wth and union wtap_pseudo_header* pseudo_header
as arguments.

Make sure that in seek_read you are setting

pseudo_header.dec_hdr->step
and not
wtap->pseudo_header.dec_hdr->step

From your mail, it looks like you are setting in the wtap->pseudo_header.

thanks,
Ravi.
On 5/29/06, Raman Singla <ramans@xxxxxxxxxxxxxxxxxxx> wrote:
i read ur answer, see i m just using these values directly, like big/little endian or message_type.(depending on message type it will decode for that message.
 
in simple language - i have to get that pseudo header value in one variable in dissector while pseudo header is read through seek_read.
 
----- Original Message -----
Sent: 2006 May 30 3:10 AM
Subject: Re: [Ethereal-dev] problem in pseudo header

Raman,

Good question!! I had posted a similar problem sometime back.
http://www.ethereal.com/lists/ethereal-dev/200605/msg00149.html

After reading your question I just realized that the pseudo_header has to be re-populated all over again in the seek_read function. I was not doing it. Thanks for your question, I might have found just the problem I have been struggling with for last 2 weeks.

thanks,
Ravi.

On 5/29/06, Raman Singla <ramans@xxxxxxxxxxxxxxxxxxx> wrote:
hi all,
 
I m writing decoder for new capture format. (dectrace).
 
I have made a pseudo_header which will carry info of frame_no, sender,receiver etc.
 
in wiretap : in read function the i m loading pseudo_header with appropiate data & i m able to use this in dissector. (for column information etc)
 
the problem :
when i m loading pseudo_header in seek_read (it is showing correct info) e.g.
in wtap->pseudo_header.dec_hdr->step
but the same information in dissector is replaced by 0
e.g. value of pinfo->pseudo_header.dec_hdr->step is 0.
 
i m unable to understand why the same info if loaded through read is raching correct at dissector when the same is loaded from seek_read is replaced by 0 somewhere between exit of seek & entry to dissector.
 
regards
 
Raman
Ext - 1667

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