convert to data uri

to_datauri.rb

# tools.ietf.org/html/rfc2397
# developer.mozilla.org/en/data_URIs

require 'base64'
require 'cgi'

# based on segment7.net/projects/ruby/datafy
def to_datauri(content, content_type)
  outuri = 'data:' + content_type
  unless content_type =~ /^text/i # base64 encode if not text
    # content type anything other than text/*
    # the URI is built like this:
    # "data:" + content type + ";base64," + base64-encoded content
    outuri += ';base64'
    content = Base64.encode64(content).gsub("\n", '')
  else
    # if content type is text/*, the URI is built like this: 
    # "data:" + content type + "," + URL-encoded content
    content = CGI.escape(content)
  end
  outuri += ",#{content}"
end