method

decode_utf7

v1_9_3_125 - Show latest stable - Class: Net::IMAP

decode_utf7(s)

public

Decode a string from modified UTF-7 format to UTF-8.

UTF-7 is a 7-bit encoding of Unicode [UTF7]. IMAP uses a slightly modified version of this to encode mailbox names containing non-ASCII characters; see [IMAP] section 5.1.3.

Net::IMAP does not automatically encode and decode mailbox names to and from utf7.

# File lib/net/imap.rb, line 941
    def self.decode_utf7(s)
      return s.gsub(/&(.*?)-/) {
        if $1.empty?
          "&"
        else
          base64 = $1.tr(",", "/")
          x = base64.length % 4
          if x > 0
            base64.concat("=" * (4 - x))
          end
          base64.unpack("m")[0].unpack("n*").pack("U*")
        end
      }.force_encoding("UTF-8")
    end

decode_utf7

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