fix encode decode

ebulk-data/embulk-wendelin-dataset-tool/lib/embulk/output/wendelin.rb

@@ -107,7 +107,7 @@ module Embulk
             else
 	      @reference = [supplier, dataset, filename, extension, eof, size, hash].join(DatasetUtils::REFERENCE_SEPARATOR)
 	      split = eof != ""
-	      ingestion_response = @wendelin.ingest(@reference, data_chunk, split)
+	      ingestion_response = @wendelin.ingest(@reference, Base64.decode64(data_chunk), split)
 	      if not ingestion_response["success"]
 		raise ingestion_response["message"]
 	      end

ebulk-data/embulk-wendelin-dataset-tool/lib/embulk/wendelin_client.rb

@@ -17,7 +17,7 @@ class WendelinClient
   HTTP_MEMORY_ERROR = "MEMORY-ERROR"
   HTTP_REFERENCE_EXIST = "REFERENCE-EXIST"
 
-  def initialize(erp5_url, user, password, tag, extension)
+  def initialize(erp5_url, user, password, tag=nil, extension=nil)
     @erp5_url = erp5_url
     @user = user
     @password = password