107 lines
2.5 KiB
Ruby
107 lines
2.5 KiB
Ruby
require "kconv"
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# Perform encoding and decoding of binary data using a Base64
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# representation. This library rather unfortunately loads its four
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# methods directly into the top level namespace.
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#
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# require "base64"
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#
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# enc = encode64('Send reinforcements')
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# puts enc
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# plain = decode64(enc)
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# puts plain
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module Base64
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module_function
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# Returns the Base64-decoded version of _str_.
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#
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# require 'base64'
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# str = 'VGhpcyBpcyBsaW5lIG9uZQpUaGlzIG' +
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# 'lzIGxpbmUgdHdvClRoaXMgaXMgbGlu' +
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# 'ZSB0aHJlZQpBbmQgc28gb24uLi4K'
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# puts decode64(str)
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#
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# <i>Generates:</i>
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#
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# This is line one
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# This is line two
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# This is line three
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# And so on...
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def decode64(str)
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str.unpack("m")[0]
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end
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# Decodes text formatted using a subset of RFC2047 (the one used for
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# mime-encoding mail headers). Only supports an encoding type of 'b'
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# (base 64), and only supports the character sets ISO-2022-JP and
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# SHIFT_JIS (so the only two encoded word sequences recognized are
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# <tt>=?ISO-2022-JP?B?...=</tt> and
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# <tt>=?SHIFT_JIS?B?...=</tt>). Recognition of these sequences is case
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# insensitive.
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def decode_b(str)
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str.gsub!(/=\?ISO-2022-JP\?B\?([!->@-~]+)\?=/i) {
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decode64($1)
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}
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str = Kconv::toeuc(str)
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str.gsub!(/=\?SHIFT_JIS\?B\?([!->@-~]+)\?=/i) {
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decode64($1)
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}
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str = Kconv::toeuc(str)
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str.gsub!(/\n/, ' ')
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str.gsub!(/\0/, '')
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str
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end
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# Returns the Base64-encoded version of \obj{str}.
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#
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# require 'base64'
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# str = "Once\nupon\na\ntime." #!sh!
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# enc = encode64(str)
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# decode64(enc)
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def encode64(bin)
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[bin].pack("m")
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end
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# Prints the Base64 encoded version of _bin_ (a +String+) in lines of
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# _len_ (default 60) characters.
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#
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# require 'base64'
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# b64encode("Now is the time for all good coders\nto learn Ruby")
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#
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# Generates
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#
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# Tm93IGlzIHRoZSB0aW1lIGZvciBhbGwgZ29vZCBjb2RlcnMKdG8gbGVhcm4g
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# UnVieQ==
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def b64encode(bin, len = 60)
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encode64(bin).scan(/.{1,#{len}}/o) do
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print $&, "\n"
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end
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end
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module Deprecated # :nodoc:
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include Base64
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def _deprecated_base64(*args)
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m0, m1 = caller(0)
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m = m0[/\`(.*?)\'\z/, 1]
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warn("#{m1}: #{m} is deprecated; use Base64.#{m} instead")
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super
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end
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dep = instance_method(:_deprecated_base64)
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remove_method(:_deprecated_base64)
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for m in Base64.private_instance_methods(false)
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define_method(m, dep)
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end
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end
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end
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include Base64::Deprecated
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