On Wed, 20 Mar 2002, Edouard Gomez wrote:
> Oh ! What a stupid "bug", not really a bug but... I can explain
> you why this bit of code is there (the src = atm_cells + tmp)
>
> Reason :
>
> When we receive data which length is not zero modulo 48, that's
> we received garbage either at the beginning or at the end of the
> data. I remember, I hesitated to set the default behaviour to
> ignore the beginning or the end of the data. So i tested both
> solution but as none is really better (because both are valid
> or i should say an easy workaround of the problem).
>
> So now the solutions :
>
> /* Skip data at the beginning */
> dst = ...;
> src = atm_cells;
>
> if(!tmp) { <<<<<<<<<< if(tmp) { :-)
> src += tmp;
> length -= tmp;
> }
>
> or the other solution
>
> /* Skip data at the end */
> dst = ...;
> src = atm_cells;
>
> if(!tmp) <<<<<<<<<<<< if(tmp)
> length -= tmp;
>
> But i think the first solution is a better one. 1 reason :
> - if we skip the end of the data, we surely skip
> the aal5 "header" that is at the end. Not a good
> solution :\
>
> Do you agree ?
>
Don't know. Obviously the second (with correction) is what is happening at
the moment and most people don't seem to be complaining.
How about:
src = atm_cells;
if(tmp) {
length -= tmp;
if(*(src+2) == (vci & 0x00000ff0) >> 4) {
/* assume corruption is at the end */
} else {
/* assume corruption is at the beginning */
src+=tmp;
}
}
or possibly ...
src = atm_cells;
if(tmp) {
int i;
length -= tmp;
for(i = 0; i < tmp; i++,src++) {
if(*(src+2+i) == (vci & 0x00000ff0) >> 4) {
break;
}
}
}
Tim.
--
God said, "div D = rho, div B = 0, curl E = - @B/@t, curl H = J + @D/@t,"
and there was light.
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