Add QByteArray

[CodeHunt]

I have two binary files, of which I have no clue about their data organization. I have them as QByteArray stream and overlap them meaning a[i]=b[i]+c[i].

I made an attempt with

QByteArray x,y,z
for(k=0;k<x.size();k++){
for(l=0;l<y.size();l++){
if(k=l){
z[k]=x[k]+y[l];
z.append(z[k]);
}
}
}

I know that it was a naive attempt but couldn't do more as I have no clue about the internal data organization, all I know is they are binary. Any suggestions or help please !!