#!/usr/bin/ruby

class ADExtractor
  
  def initialize(options = {})
    @time_xyz = {}
  end
  
  attr_reader :time_xyz
  
  def process(page)
    if page[0] == ?A then
      start_time = page[1...5].unpack("V").first  # ms
      5.step(31, 3){|n| 
        @time_xyz[start_time] = page[n...(n+3)].unpack("c*")
        start_time += 20  # 50Hz
      }
      return true
    else
      return false
    end
  end
end

if __FILE__ == $0 then

$stderr.puts "Usage #{__FILE__} log.dat"

if ARGV.size < 1 then exit end

  file_name = ARGV.shift
  extractor = ADExtractor::new
  
  open(file_name){|io|
    io.binmode
    page_count = -1
    while !io.eof?
      page_count += 1
      extractor.process(io.read(32))
    end
    
    extractor.time_xyz.to_a.sort{|a, b| a[0] <=> b[0]}.each{|time, xyz_g|
      x, y, z = xyz_g
      puts sprintf("%10d%5d%5d%5d", time, x, y, z)
    }
  }
end