#!/usr/bin/env ruby

if ARGV.size < 2 then
  puts "Usage: #{__FILE__} 0.dat 1.dat ... > combined.dat"
  exit
end

PAGE_SIZE = 32

last_target_A_packet_time = 0
ARGV.each_with_index{|target, i|
  current_target_A_packet_time_shift = last_target_A_packet_time
  open(target, 'r'){|io|    
    page = nil
    while (page = io.read(PAGE_SIZE))
      if page[0] == ?A then
        t = (page[2..5].unpack("V"))[0]
        #p page[2..5] == [t].pack("V")
        if i > 0 then
          last_target_A_packet_time = t + current_target_A_packet_time_shift
          page[2..5] = [last_target_A_packet_time].pack("V")
        else
          last_target_A_packet_time = t
        end
      end
      $stdout << page
    end
  }
}