--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/bin/ed2k	Sat Jul 10 12:38:52 2010 +0000
@@ -0,0 +1,26 @@
+#!/usr/bin/env ruby
+require 'openssl'
+
+def file_ed2k(file_name, output_mode = "hash")
+  ed2k_block = 9500*1024 #ed2k block size is 9500 KiB
+  ed2k_hash = ""
+  file = File.open(file_name, 'rb')
+  file_size = file.stat.size #while at it, fetch the size of the file
+  while (block = file.read(ed2k_block)) do
+    ed2k_hash << OpenSSL::Digest::MD4.digest(block) #hashes are concatenated md4 per block size for ed2k hash
+  end
+  ed2k_hash << OpenSSL::Digest::MD4.digest("") if file_size % ed2k_block == 0 #on size of modulo block size, append another md4 hash of a blank string
+  file.close
+  ed2k_hash = OpenSSL::Digest::MD4.hexdigest(ed2k_hash) #finally
+  return case output_mode #there are 2 modes, just the has, or complete with link.
+    when "hash"
+      ed2k_hash
+    when "link"
+      "ed2k://|file|#{File.basename(file_name)}|#{file_size}|#{ed2k_hash}|"
+    end
+end
+
+ARGV.each do |file_name|
+  next unless File.file?(file_name) and File.readable?(file_name)
+  printf("%s\n", file_ed2k(file_name,"link"))
+end