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                                                                                                                                                                                     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 check_encoding(xml)
      # We have to recognize UTF-16BE, UTF-16LE, and UTF-8
      if xml[0, 2] == "\xfe\xff"
        xml[0, 2] = ""
        return 'UTF-16BE'
      elsif xml[0, 2] == "\xff\xfe"
        xml[0, 2] = ""
        return 'UTF-16LE'
      end
      xml =~ /^\s*<\?xml\s+version\s*=\s*(['"]).*?\1\s+encoding\s*=\s*(["'])(.*?)\2/m
      return $3 ? $3.upcase : 'UTF-8'
    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