scm: add "scm_iconv" method for repository path encoding in abstract_adapter.rb (#2664, #2274).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4906 e93f8b46-1217-0410-a6f0-8f06a7374b81

lib/redmine/scm/adapters/abstract_adapter.rb

@@ -221,6 +221,17 @@ module Redmine
         def strip_credential(cmd)
           self.class.strip_credential(cmd)
         end
+
+        def scm_iconv(to, from, str)
+          return nil if str.nil?
+          return str if to == from
+          begin
+            Iconv.conv(to, from, str)
+          rescue Iconv::Failure => err
+            logger.error("failed to convert from #{from} to #{to}. #{err}")
+            nil
+          end
+        end
       end
 
       class Entries < Array