bom.rb

# csv files that contain a Byte order Mark
# already gunzipped files are working:

    def unpack(date)
        CSV.foreach("file_#{date.strftime('%Y%m%d')}.csv", col_sep: ';', headers: true, encoding: "bom|utf-8") do |row|
          yield row 
        end 
    end 

# exception due to BOM when gunzipping:

    def unpack(date)
      Zlib::GzipReader.open("file_#{date.strftime('%Y%m%d')}.csv.gz") do |gz|
        CSV.parse(gz.read, col_sep: ';', headers: true, encoding: "bom|utf-8") do |row|
          yield row 
        end 
      end
    end