#!ruby
# -*- mode: ruby; coding: utf-8 -*-
# Last updated: <2022/08/18 06:57:23 +0900>
#
# Read image file, output base64
#
# Windows10 x64 21H2 + Ruby 1.9.3 p551 i386-mingw32
#
# Ruby 1.8.7 is not work

infile = ARGV[0]
bin_data = File.binread(infile)
base64_text = [bin_data].pack("m")
puts base64_text