[Click] Alignment info for custom element

[Roberto Riggio]

Hi,

which is the right approach (if any) to handle the alignment info (in 
the click_align tool)
for an element which pulls a variable number of bytes from a packet. The 
amount of bytes
is contained in the header itself.

I was thinking about putting a classifier element before the custom 
element (and then handle
the alignment for each case), but this solution does not look very elegant.

Any idea
R.