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> I think you want
>   local pos, mopt_unpack = string.unpack('i', block)

Oops! Better:

  local pos, mopt_unpack = string.unpack(block, 'i')

Sorry for the noise. As a suggestion, I guess a more consistent interface
would be pack(f, ...) and unpack(f, s [,init]), similarly to Roberto's struct


A mathematician is a device for turning coffee into theorems.
        -- P. Erdos 

Luis Carvalho
Applied Math PhD Student
Brown University