class Mail::Encodings::TransferEncoding
Constants
- NAME
- PRIORITY
Public Class Methods
Source
# File lib/mail/encodings/transfer_encoding.rb, line 19 def self.can_encode?(enc) can_transport? enc end
Override in subclasses to indicate that they can encode text that couldn’t be directly transported, e.g. Base64
has 7bit output, but it can encode binary.
Source
Source
# File lib/mail/encodings/transfer_encoding.rb, line 27 def self.compatible_input?(str) true end
Source
# File lib/mail/encodings/transfer_encoding.rb, line 23 def self.cost(str) raise "Unimplemented" end
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# File lib/mail/encodings/transfer_encoding.rb, line 56 def self.lowest_cost(str, encodings) best = nil best_cost = nil encodings.each do |enc| # If the current choice cannot be transported safely, give priority # to other choices but allow it to be used as a fallback. this_cost = enc.cost(str) if enc.compatible_input?(str) if !best_cost || (this_cost && this_cost < best_cost) best_cost = this_cost best = enc elsif this_cost == best_cost best = enc if enc::PRIORITY < best::PRIORITY end end best end
Source
# File lib/mail/encodings/transfer_encoding.rb, line 35 def self.negotiate(message_encoding, source_encoding, str, allowed_encodings = nil) message_encoding = Encodings.get_encoding(message_encoding) || Encodings.get_encoding('8bit') source_encoding = Encodings.get_encoding(source_encoding) if message_encoding && source_encoding && message_encoding.can_transport?(source_encoding) && source_encoding.compatible_input?(str) source_encoding else renegotiate(message_encoding, source_encoding, str, allowed_encodings) end end
Source
# File lib/mail/encodings/transfer_encoding.rb, line 46 def self.renegotiate(message_encoding, source_encoding, str, allowed_encodings = nil) encodings = Encodings.get_all.select do |enc| (allowed_encodings.nil? || allowed_encodings.include?(enc)) && message_encoding.can_transport?(enc) && enc.can_encode?(source_encoding) end lowest_cost(str, encodings) end