Net::FTP and UTF-8

test.rb

# encoding: UTF-8
Encoding.default_internal = Encoding::UTF_8
Encoding.default_external = Encoding::UTF_8
require 'net/ftp'
require 'debugger'
require 'fileutils'

module Net
  class FTP
    def storbinary(cmd, file, blocksize, rest_offset = nil, &block) # :yield: data
      if rest_offset
        file.seek(rest_offset, IO::SEEK_SET)
      end
      synchronize do
        with_binary(true) do
          @sock.set_encoding('utf-8')
          conn = transfercmd(cmd)
          loop do
            buf = file.read(blocksize)
            break if buf == nil
            conn.write(buf)
            yield(buf) if block
          end
          conn.close
          voidresp
        end
      end
    rescue Errno::EPIPE
      # EPIPE, in this case, means that the data connection was unexpectedly
      # terminated.  Rather than just raising EPIPE to the caller, check the
      # response on the control connection.  If getresp doesn't raise a more
      # appropriate exception, re-raise the original exception.
      getresp
      raise
    end

    def putline line
      if @debug_mode
        print "put: ", sanitize(line), "\n"
      end
      line = line + CRLF
      @sock.write(line)
    end
    private :putline
  end
end

filename = '/tmp/somefile_©_.sample'
FileUtils.touch filename

ftp = Net::FTP.new 'host'
ftp.login 'username', 'password'
ftp.debug_mode = true
ftp.put filename
ftp.close