--- a/bin/cek.rb	Wed Jun 18 16:08:22 2014 +0900
+++ b/bin/cek.rb	Sun Jun 29 01:30:18 2014 +0900
@@ -1,14 +1,71 @@
 #!/usr/bin/env ruby
 require 'zlib'
 
-block = 1048576
-ARGV.each do |filename|
-  crc = 0
-  file = File.open(filename, 'rb')
-  currentbyte = 0
-  while (line = file.read(block)) do
-    crc = Zlib.crc32(line,crc)
+class Cek
+  CRC32_BLOCK = 2 ** 20
+
+  attr_accessor :files
+
+  def crc32(filepath)
+    file = File.open filepath, 'rb'
+    crc32 = 0
+    while (line = file.read(CRC32_BLOCK)) do
+      crc32 = Zlib.crc32(line, crc32)
+    end
+    file.close
+
+    format "%08X", crc32.to_i
   end
-  file.close
-  printf("%s %08X\n", filename, crc.to_i)
+
+  def print_result
+    results = Hash.new(0)
+    files.each do |f|
+      time_start = Time.now
+      if File.readable?(f) && File.file?(f) then
+        hash = crc32 f
+        size = File.size f
+        /(\[|\()(?<filename_hash>\p{XDigit}{8})(\]|\))/ =~ f
+        result =
+          if filename_hash
+            if filename_hash == hash
+              :ok
+            else
+              :fail
+            end
+          else
+            :missing_hash
+          end
+        output = hash
+        case result
+          when :ok then output << " - OK!"
+          when :fail then output << " - ERROR - should be #{filename_hash}"
+        end
+      else
+        result = :unreadable
+        output = "not a file or unreadable"
+      end
+      process_time = Time.now - time_start
+      size ||= 0
+      size_mb = size.to_f / 1_000_000
+      speed = (size_mb.to_f / process_time)
+      results[result] += 1
+      puts "#{f}: #{output} (#{format "%.2f", size_mb} MB / #{format "%.2f", process_time} s / #{format "%.2f", speed} MB/s)"
+    end
+    puts ("-" * 50)
+    puts "Files ok: #{results[:ok]}"
+    puts "Files broken: #{results[:fail]}"
+    puts "Files without crc information: #{results[:missing_hash]}"
+    puts "Files unreadable or not a file: #{results[:unreadable]}"
+  end
+
+  def initialize(*files)
+    self.files = files.flatten
+    @stats = {}
+  end
+
+  def self.run(*files)
+    new(files).print_result
+  end
 end
+
+Cek.run(ARGV) if __FILE__ == $0