* lib/securerandom.rb (SecureRandom.uuid): uses unpacked array

instead of string, because String#[] returns one length string.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@21872 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Thu Jan 29 13:16:11 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* lib/securerandom.rb (SecureRandom.uuid): uses unpacked array
+	  instead of string, because String#[] returns one length string.
+
 Thu Jan 29 12:29:51 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* lib/rake.rb (FileUtils#rake_system): no longer needs workaround

lib/securerandom.rb

@@ -169,11 +169,9 @@ module SecureRandom
 
   # SecureRandom.uuid generates a v4 random UUID.
   def self.uuid
-    str = self.random_bytes(16)
-    str[6] = (str[6] & 0x0f) | 0x40
-    str[8] = (str[8] & 0x3f) | 0x80
-
-    ary = str.unpack("NnnnnN")
+    ary = self.random_bytes(16).unpack("NnnnnN")
+    ary[2] = (ary[2] & 0x0fff) | 0x4000
+    ary[3] = (ary[3] & 0x3fff) | 0x8000
     "%08x-%04x-%04x-%04x-%04x%08x" % ary
   end