1 files changed, 50 insertions, 0 deletions
diff --git a/jni/ruby/lib/rexml/encoding.rb b/jni/ruby/lib/rexml/encoding.rb
new file mode 100644
index 0000000..1c7e79a
--- /dev/null
+++ b/jni/ruby/lib/rexml/encoding.rb
@@ -0,0 +1,50 @@
+# coding: US-ASCII
+module REXML
+  module Encoding
+    # ID ---> Encoding name
+    attr_reader :encoding
+    def encoding=(encoding)
+      encoding = encoding.name if encoding.is_a?(Encoding)
+      if encoding.is_a?(String)
+        original_encoding = encoding
+        encoding = find_encoding(encoding)
+        unless encoding
+          raise ArgumentError, "Bad encoding name #{original_encoding}"
+        end
+      end
+      return false if defined?(@encoding) and encoding == @encoding
+      if encoding
+        @encoding = encoding.upcase
+      else
+        @encoding = 'UTF-8'
+      end
+      true
+    end
+
+    def encode(string)
+      string.encode(@encoding)
+    end
+
+    def decode(string)
+      string.encode(::Encoding::UTF_8, @encoding)
+    end
+
+    private
+    def find_encoding(name)
+      case name
+      when /\Ashift-jis\z/i
+        return "SHIFT_JIS"
+      when /\ACP-(\d+)\z/
+        name = "CP#{$1}"
+      when /\AUTF-8\z/i
+        return name
+      end
+      begin
+        ::Encoding::Converter.search_convpath(name, 'UTF-8')
+      rescue ::Encoding::ConverterNotFoundError
+        return nil
+      end
+      name
+    end
+  end
+end