# File lib/action_mailer/vendor/tmail/quoting.rb, line 94
94:         def convert_to(text, to, from)
95:           warn "Action Mailer: iconv not loaded; ignoring conversion from #{from} to #{to} (#{__FILE__}:#{__LINE__})"
96:           text
97:         end

    # File lib/action_mailer/vendor/tmail/quoting.rb, line 80
80:         def convert_to(text, to, from)
81:           return text unless to && from
82:           text ? Iconv.iconv(to, from, text).first : ""
83:         rescue Iconv::IllegalSequence, Errno::EINVAL
84:           # the 'from' parameter specifies a charset other than what the text
85:           # actually is...not much we can do in this case but just return the
86:           # unconverted text.
87:           #
88:           # Ditto if either parameter represents an unknown charset, like
89:           # X-UNKNOWN.
90:           text
91:         end

    # File lib/action_mailer/vendor/tmail/quoting.rb, line 50
50:       def unquote_and_convert_to(text, to_charset, from_charset = "iso-8859-1", preserve_underscores=false)
51:         return "" if text.nil?
52:         if text =~ /^=\?(.*?)\?(.)\?(.*)\?=$/
53:           from_charset = $1
54:           quoting_method = $2
55:           text = $3
56:           case quoting_method.upcase
57:             when "Q" then
58:               unquote_quoted_printable_and_convert_to(text, to_charset, from_charset, preserve_underscores)
59:             when "B" then
60:               unquote_base64_and_convert_to(text, to_charset, from_charset)
61:             else
62:               raise "unknown quoting method #{quoting_method.inspect}"
63:           end
64:         else
65:           convert_to(text, to_charset, from_charset)
66:         end
67:       end

    # File lib/action_mailer/vendor/tmail/quoting.rb, line 74
74:       def unquote_base64_and_convert_to(text, to, from)
75:         convert_to(Base64.decode(text).first, to, from)
76:       end

    # File lib/action_mailer/vendor/tmail/quoting.rb, line 69
69:       def unquote_quoted_printable_and_convert_to(text, to, from, preserve_underscores=false)
70:         text = text.gsub(/_/, " ") unless preserve_underscores
71:         convert_to(text.unpack("M*").first, to, from)
72:       end