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Filename : base64.rb
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# frozen_string_literal: false
#
# xmlrpc/base64.rb
# Copyright (C) 2001, 2002, 2003 by Michael Neumann (mneumann@ntecs.de)
#
# Released under the same term of license as Ruby.

module XMLRPC # :nodoc:

# This class is necessary for 'xmlrpc4r' to determine that a string should
# be transmitted base64-encoded and not as a raw-string.
#
# You can use XMLRPC::Base64 on the client and server-side as a
# parameter and/or return-value.
class Base64
  include Comparable

  # Creates a new XMLRPC::Base64 instance with string +str+ as the
  # internal string. When +state+ is +:dec+ it assumes that the
  # string +str+ is not in base64 format (perhaps already decoded),
  # otherwise if +state+ is +:enc+ it decodes +str+
  # and stores it as the internal string.
  def initialize(str, state = :dec)
    case state
    when :enc
      @str = Base64.decode(str)
    when :dec
      @str = str
    else
      raise ArgumentError, "wrong argument; either :enc or :dec"
    end
  end

  # Returns the decoded internal string.
  def decoded
    @str
  end

  # Returns the base64 encoded internal string.
  def encoded
    Base64.encode(@str)
  end

  # Compare two base64 values, based on decoded string
  def <=>(other)
    return nil unless other.is_a?(self.class)
    decoded <=> other.decoded
  end

  # Decodes string +str+ with base64 and returns that value.
  def Base64.decode(str)
    str.gsub(/\s+/, "").unpack("m")[0]
  end

  # Encodes string +str+ with base64 and returns that value.
  def Base64.encode(str)
    [str].pack("m")
  end

end


end # module XMLRPC


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