HEX文字列をbinaryに変換する

hex2bin.rb

#!/bin/env ruby

$HEX = false
if ARGV[0] == "-x"
  $HEX = true
  ARGV.shift
end
if ARGV.length != 1
  puts "#{$0} outputfile"
  exit -1
end
unless file = File.open(ARGV[0],"wb")
  puts "#{$0} outputfile"
  puts "#{ARGV[0]} can't write"
  exit -1
end
begin
  datas = []
  if $HEX
    STDIN.each do |line|
      datas.concat(line.scan(/[\da-zA-Z]{2}/).map do|i| i.hex end)
    end
  else
    STDIN.each do |line|
      datas.concat(line.scan(/[\d]{1,3}/).map do|i| i.to_i end)
    end
  end
  file.write(datas.pack("C*"))
ensure
  file.close
end