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require "kconv"
# Perform encoding and decoding of binary data using a Base64
# representation. This library rather unfortunately loads its four
# methods directly into the top level namespace.
#
# require "base64"
#
# enc = encode64('Send reinforcements')
# puts enc
# plain = decode64(enc)
# puts plain
# Returns the Base64-decoded version of \obj{str}.
#
# require 'base64'
# str = 'VGhpcyBpcyBsaW5lIG9uZQpUaGlzIG' +
# 'lzIGxpbmUgdHdvClRoaXMgaXMgbGlu' +
# 'ZSB0aHJlZQpBbmQgc28gb24uLi4K'
# puts decode64(str)
#
# <i>Generates:</i>
#
# 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 \obj{str}.
#
# require 'base64'
# str = "Once\nupon\na\ntime." #!sh!
# enc = encode64(str)
# decode64(enc)
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'
# b64encode("Now is the time for all good coders\nto learn Ruby")
#
# Generates
#
# Tm93IGlzIHRoZSB0aW1lIGZvciBhbGwgZ29vZCBjb2RlcnMKdG8gbGVhcm4g
# UnVieQ==
def b64encode(bin, len = 60)
encode64(bin).scan(/.{1,#{len}}/o) do
print $&, "\n"
end
end
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