This quickly gets ed2k links for anidb crequing.

quick_ed2k.rb

#!/usr/bin/env ruby
require 'openssl'

if ARGV.length == 0
  	puts "This quickly gets ed2k links for anidb crequing."
	puts "Usage: #{$0} [files]"
	exit
end

def ed2k(file_name)
	ed2k_block = 9500 * 1024
	ed2k_hash = ""
	file_size = nil
	File.open(file_name, 'rb') do |f|
	  file_size = f.stat.size #while at it, fetch the size of the file
	  while block = f.read(ed2k_block) do
	    #hashes are concatenated md4 per block size for ed2k hash
	    ed2k_hash << OpenSSL::Digest::MD4.digest(block)
	  end
	  #on size of modulo block size, append another md4 hash of a blank string
	  ed2k_hash << OpenSSL::Digest::MD4.digest("") if(file_size % ed2k_block) == 0
	end
	#finally
	ed2k_hash = OpenSSL::Digest::MD4.hexdigest(ed2k_hash)
	[ file_size, ed2k_hash ]
end


# ed2k sample link: ed2k://|file|The_Two_Towers-The_Purist_Edit-Trailer.avi|14997504|965c013e991ee246d63d45ea71954c4d|/
ARGV.each do |file|
	filebase = File.basename(file)
	size, hash = ed2k(file)
	puts "ed2k://|file|#{filebase}|#{size}|#{hash}|/"
end