support uu encoding

lib/mail.rb

@@ -83,6 +83,7 @@ def self.eager_autoload!
   require 'mail/encodings'
   require 'mail/encodings/base64'
   require 'mail/encodings/quoted_printable'
+  require 'mail/encodings/unix_to_unix'
 
   require 'mail/matchers/has_sent_mail'
 

lib/mail/encodings/unix_to_unix.rb

@@ -0,0 +1,17 @@
+module Mail
+  module Encodings
+    module UnixToUnix
+      NAME = "x-uuencode"
+
+      def self.decode(str)
+        str.sub(/\Abegin \d+ [^\n]*\n/, '').unpack('u').first
+      end
+
+      def self.encode(str)
+        [str].pack("u")
+      end
+
+      Encodings.register(NAME, self)
+    end
+  end
+end

spec/mail/encodings/unix_to_unix_spec.rb

@@ -0,0 +1,40 @@
+# encoding: utf-8
+require 'spec_helper'
+
+describe Mail::Encodings::UnixToUnix do
+  def decode(str)
+    Mail::Encodings::UnixToUnix.decode(str)
+  end
+
+  def encode(str)
+    Mail::Encodings::UnixToUnix.encode(str)
+  end
+
+  it "decodes" do
+    text = strip_heredoc(<<-TEXT)
+      begin 644 Happy.txt
+      M2&%P<'D@=&]D87D@9F]R('1O(&)E(&]N92!O9B!P96%C92!A;F0@<V5R96YE
+      '('1I;64N"@``
+      `
+      end
+    TEXT
+    expect(decode(text)).to eq "Happy today for to be one of peace and serene time.\n"
+  end
+
+  it "encodes" do
+    expect(encode("Happy today")).to eq "+2&%P<'D@=&]D87D`\n"
+  end
+
+  if RUBY_VERSION > "1.9"
+    it "encodes / decodes non-ascii" do
+      expect(encode("Happy ああr")).to eq "-2&%P<'D@XX&\"XX&\"<@``\n"
+      expected = (RUBY_ENGINE == "jruby" ? "Happy ああr" : "Happy ああr".force_encoding("binary"))
+      expect(decode("-2&%P<'D@XX&\"XX&\"<@``\n")).to eq expected
+    end
+  end
+
+  it "can read itself" do
+    expect(decode(encode("Happy today"))).to eq "Happy today"
+    expect(encode(decode("+2&%P<'D@=&]D87D`\n"))).to eq "+2&%P<'D@=&]D87D`\n"
+  end
+end

spec/spec_helper.rb

@@ -37,12 +37,10 @@
   end
 end
 
-
 def fixture(*name)
   File.join(SPEC_ROOT, 'fixtures', name)
 end
 
-
 # Produces an array or printable ascii by default.
 #
 # We can assume if a, m and z and 1, 5, 0 work, then the rest
@@ -56,6 +54,12 @@ def ascii(from = 33, to = 126)
   chars - boring
 end
 
+# https://github.com/rails/rails/blob/master/activesupport/lib/active_support/core_ext/string/strip.rb#L22
+def strip_heredoc(string)
+  indent = string.scan(/^[ \t]*(?=\S)/).min.size
+  string.gsub(/^[ \t]{#{indent}}/, '')
+end
+
 # Original mockup from ActionMailer
 class MockSMTP