rohc team mailing list archive

[Harpreet Singh <harpreeta@xxxxxxxxxxxxx>]

Hi Didier,

The code I replaced it with is given below.
	/* read the IP-ID field */
        {
         uint16_t temp = 0;
         temp = packet[0];
         temp <<= 8;
         temp |= packet[1];   
	//ipv4_set_id(ip, *((uint16_t *) packet));
	ipv4_set_id(ip, temp);
	rohc_debugf(3, "IP-ID = 0x%04x\n", ntohs(ipv4_get_id(*ip)));
	packet += 2;
	read += 2;
        }
from below given function "d_decode_dynamic_ip4".

I have not used gdb yet on uclinux.

can you send some instructions as you said?
It will be helpful.

Thanks & Regards,
Harpreet

On Tue, 2009-11-24 at 18:31 +0100, Didier Barvaux wrote:
> Hi,
> 
> > You are right.I was able to solve the problem.
> > by doing two things.
> > 
> > First in d_generic.c packet was being accessed using (uint16*)
> > typecast.
> >
> > The crash was happening here. I changed two byte access.
> 
> I'm interested by your change. Could you please give me the function
> name and the line you changed and the exact change you made as well ?
> 
>  
> > another issue i faced after this was feedback, in bidirectional
> > decompressor case.
> > 
> > i stopped that by allocating decompressor with NULL.
> > 
> > My system is point to point . What are the advantages of bidirectional
> > decompressor?
> 
> Bidirectional behaviour of the decompressor makes use of feedback
> information to warn the ROHC compressor that a problem occurred (lost
> or bad packets that lead to compressor/decompressor
> mis-synchronization).
> 
> When the ROHC compressor receives the feedback information, it sends
> information about the compressed stream to the decompressor to
> synchronize the decompressor again. This should reduce the number of
> ROHC packets the decompressor fails to decompress correctly after a
> network problem occurred.
> 
> I'm also interested by the root of the problem with the feedback
> mechanism. Could you please run your program in gdb, wait for it to
> crash and send me the backtrace you get ? If you do not know how to use
> gdb, I can give you detailed information to get the backtrace.
> 
> Regards,
> 
> Didier Barvaux
> Viveris Technologies
> 
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