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//opt/alt/ruby18/lib64/ruby/1.8/base64.rb

#
# = base64.rb: methods for base64-encoding and -decoding stings
#
# Author:: Yukihiro Matsumoto 
# Documentation:: Dave Thomas and Gavin Sinclair
#
# Until Ruby 1.8.1, these methods were defined at the top-level.  Now
# they are in the Base64 module but included in the top-level, where
# their usage is deprecated.
#
# See Base64 for documentation.
#

require "kconv"

# The Base64 module provides for the encoding (#encode64) and decoding
# (#decode64) of binary data using a Base64 representation.
# 
# The following particular features are also provided:
# - encode into lines of a given length (#b64encode)
# - decode the special format specified in RFC2047 for the
#   representation of email headers (decode_b)
#
# == Example
#
# A simple encoding and decoding. 
# 
#     require "base64"
#
#     enc   = Base64.encode64('Send reinforcements')
#                         # -> "U2VuZCByZWluZm9yY2VtZW50cw==\n" 
#     plain = Base64.decode64(enc)
#                         # -> "Send reinforcements"
#
# The purpose of using base64 to encode data is that it translates any
# binary data into purely printable characters.  It is specified in
# RFC 2045 (http://www.faqs.org/rfcs/rfc2045.html).

module Base64
  module_function

# Returns the Base64-decoded version of +str+.
 #
 # require 'base64'
 # str = 'VGhpcyBpcyBsaW5lIG9uZQpUaGlzIG' +
 # 'lzIGxpbmUgdHdvClRoaXMgaXMgbGlu' +
 # 'ZSB0aHJlZQpBbmQgc28gb24uLi4K'
 # puts Base64.decode64(str)
 #
 # Generates:
 #
 # This is line one
 # This is line two
 # This is line three
 # And so on...

def decode64(str)
    str.unpack("m")[0]
  end

# Decodes text formatted using a subset of RFC2047 (the one used for
 # mime-encoding mail headers).
 #
 # Only supports an encoding type of 'b' (base 64), and only supports
 # the character sets ISO-2022-JP and SHIFT_JIS (so the only two
 # encoded word sequences recognized are <tt>=?ISO-2022-JP?B?...=</tt> and
 # <tt>=?SHIFT_JIS?B?...=</tt>). Recognition of these sequences is case
 # insensitive.

def decode_b(str)
    str.gsub!(/=\?ISO-2022-JP\?B\?([!->@-~]+)\?=/i) {
      decode64($1)
    }
    str = Kconv::toeuc(str)
    str.gsub!(/=\?SHIFT_JIS\?B\?([!->@-~]+)\?=/i) {
      decode64($1)
    }
    str = Kconv::toeuc(str)
    str.gsub!(/\n/, ' ') 
    str.gsub!(/\0/, '')
    str
  end

# Returns the Base64-encoded version of +str+.
 #
 # require 'base64'
 # Base64.b64encode("Now is the time for all good coders\nto learn Ruby")
 #
 # Generates:
 #
 # Tm93IGlzIHRoZSB0aW1lIGZvciBhbGwgZ29vZCBjb2RlcnMKdG8gbGVhcm4g
 # UnVieQ==

def encode64(bin)
    [bin].pack("m")
  end

# _Prints_ the Base64 encoded version of +bin+ (a +String+) in lines of
 # +len+ (default 60) characters.
 #
 # require 'base64'
 # data = "Now is the time for all good coders\nto learn Ruby" 
 # Base64.b64encode(data)
 #
 # Generates:
 #
 # Tm93IGlzIHRoZSB0aW1lIGZvciBhbGwgZ29vZCBjb2RlcnMKdG8gbGVhcm4g
 # UnVieQ==

def b64encode(bin, len = 60)
    encode64(bin).scan(/.{1,#{len}}/) do
      print $&, "\n"
    end
  end

module Deprecated # :nodoc:
    include Base64

for m in Base64.private_instance_methods(false)
      module_eval %{
        def #{m}(*args)
          warn("\#{caller(1)[0]}: #{m} is deprecated; use Base64.#{m} instead")
          super
        end
      }
    end
  end
end

include Base64::Deprecated