local add = ( #shorts > 0 ) and table.remove( shorts, #shorts ) or 0
if ( data[pos] + add ) > 0xFFFF then
data[pos] = ( data[pos] + add ) % 0xFFFF
- if pos > 2 then
+ if pos > 1 then
data[pos-1] = data[pos-1] + ( add - data[pos] )
+ else
+ return nil
end
else
data[pos] = data[pos] + add