JezK

Name: test
Start: 2022-11-25
End: 2022-11-25

Edit File: ruby_1_9.rb

# encoding: utf-8
# frozen_string_literal: true

module Mail
  class Ruby19
    class StrictCharsetEncoder
      def encode(string, charset)
        case charset
        when /utf-?7/i
          Mail::Ruby19.decode_utf7(string)
        else
          string.force_encoding(Mail::Ruby19.pick_encoding(charset))
        end
      end
    end

class BestEffortCharsetEncoder
      def encode(string, charset)
        case charset
        when /utf-?7/i
          Mail::Ruby19.decode_utf7(string)
        else
          string.force_encoding(pick_encoding(charset))
        end
      end

private

def pick_encoding(charset)
        charset = case charset
        when /ansi_x3.110-1983/
          'ISO-8859-1'
        when /Windows-?1258/i # Windows-1258 is similar to 1252
          "Windows-1252"
        else
          charset
        end
        Mail::Ruby19.pick_encoding(charset)
      end
    end

class << self
      attr_accessor :charset_encoder
    end
    self.charset_encoder = BestEffortCharsetEncoder.new

# Escapes any parenthesis in a string that are unescaped this uses
    # a Ruby 1.9.1 regexp feature of negative look behind
    def Ruby19.escape_paren( str )
      re = /(?<!\\)([])/          # Only match unescaped parens
      str.gsub(re) { |s| '\\' + s }
    end

def Ruby19.paren( str )
      str = $1 if str =~ /^$(.*)?$$/
      str = escape_paren( str )
      '(' + str + ')'
    end

def Ruby19.escape_bracket( str )
      re = /(?<!\\)([\<\>])/          # Only match unescaped brackets
      str.gsub(re) { |s| '\\' + s }
    end

def Ruby19.bracket( str )
      str = $1 if str =~ /^\<(.*)?\>$/
      str = escape_bracket( str )
      '<' + str + '>'
    end

def Ruby19.decode_base64(str)
      if !str.end_with?("=") && str.length % 4 != 0
        str = str.ljust((str.length + 3) & ~3, "=")
      end
      str.unpack( 'm' ).first
    end

def Ruby19.encode_base64(str)
      [str].pack( 'm' )
    end

def Ruby19.has_constant?(klass, string)
      klass.const_defined?( string, false )
    end

def Ruby19.get_constant(klass, string)
      klass.const_get( string )
    end

def Ruby19.transcode_charset(str, from_encoding, to_encoding = Encoding::UTF_8)
      to_encoding = to_encoding.to_s if RUBY_VERSION < '1.9.3'
      to_encoding = Encoding.find(to_encoding)
      replacement_char = to_encoding == Encoding::UTF_8 ? '�' : '?'
      charset_encoder.encode(str.dup, from_encoding).encode(to_encoding, :undef => :replace, :invalid => :replace, :replace => replacement_char)
    end

# From Ruby stdlib Net::IMAP
    def Ruby19.encode_utf7(string)
      string.gsub(/(&)|[^\x20-\x7e]+/) do
        if $1
          "&-"
        else
          base64 = [$&.encode(Encoding::UTF_16BE)].pack("m0")
          "&" + base64.delete("=").tr("/", ",") + "-"
        end
      end.force_encoding(Encoding::ASCII_8BIT)
    end

def Ruby19.decode_utf7(utf7)
      utf7.gsub(/&([^-]+)?-/n) do
        if $1
          ($1.tr(",", "/") + "===").unpack("m")[0].encode(Encoding::UTF_8, Encoding::UTF_16BE)
        else
          "&"
        end
      end
    end

def Ruby19.b_value_encode(str, encoding = nil)
      encoding = str.encoding.to_s
      [Ruby19.encode_base64(str), encoding]
    end

def Ruby19.b_value_decode(str)
      match = str.match(/\=\?(.+)?\?[Bb]\?(.*)\?\=/m)
      if match
        charset = match[1]
        str = Ruby19.decode_base64(match[2])
        str = charset_encoder.encode(str, charset)
      end
      transcode_to_scrubbed_utf8(str)
    rescue Encoding::UndefinedConversionError, ArgumentError, Encoding::ConverterNotFoundError
      warn "Encoding conversion failed #{$!}"
      str.dup.force_encoding(Encoding::UTF_8)
    end

def Ruby19.q_value_encode(str, encoding = nil)
      encoding = str.encoding.to_s
      [Encodings::QuotedPrintable.encode(str), encoding]
    end

def Ruby19.q_value_decode(str)
      match = str.match(/\=\?(.+)?\?[Qq]\?(.*)\?\=/m)
      if match
        charset = match[1]
        string = match[2].gsub(/_/, '=20')
        # Remove trailing = if it exists in a Q encoding
        string = string.sub(/\=$/, '')
        str = Encodings::QuotedPrintable.decode(string)
        str = charset_encoder.encode(str, charset)
        # We assume that binary strings hold utf-8 directly to work around
        # jruby/jruby#829 which subtly changes String#encode semantics.
        str.force_encoding(Encoding::UTF_8) if str.encoding == Encoding::ASCII_8BIT
      end
      transcode_to_scrubbed_utf8(str)
    rescue Encoding::UndefinedConversionError, ArgumentError, Encoding::ConverterNotFoundError
      warn "Encoding conversion failed #{$!}"
      str.dup.force_encoding(Encoding::UTF_8)
    end

def Ruby19.param_decode(str, encoding)
      str = uri_parser.unescape(str)
      str = charset_encoder.encode(str, encoding) if encoding
      transcode_to_scrubbed_utf8(str)
    rescue Encoding::UndefinedConversionError, ArgumentError, Encoding::ConverterNotFoundError
      warn "Encoding conversion failed #{$!}"
      str.dup.force_encoding(Encoding::UTF_8)
    end

def Ruby19.param_encode(str)
      encoding = str.encoding.to_s.downcase
      language = Configuration.instance.param_encode_language
      "#{encoding}'#{language}'#{uri_parser.escape(str)}"
    end

def Ruby19.uri_parser
      @uri_parser ||= URI::Parser.new
    end

# Pick a Ruby encoding corresponding to the message charset. Most
    # charsets have a Ruby encoding, but some need manual aliasing here.
    #
    # TODO: add this as a test somewhere:
    #   Encoding.list.map { |e| [e.to_s.upcase == pick_encoding(e.to_s.downcase.gsub("-", "")), e.to_s] }.select {|a,b| !b}
    #   Encoding.list.map { |e| [e.to_s == pick_encoding(e.to_s), e.to_s] }.select {|a,b| !b}
    def Ruby19.pick_encoding(charset)
      charset = charset.to_s
      encoding = case charset.downcase

# ISO-8859-8-I etc. http://en.wikipedia.org/wiki/ISO-8859-8-I
      when /^iso[-_]?8859-(\d+)(-i)?$/
        "ISO-8859-#{$1}"

# ISO-8859-15, ISO-2022-JP and alike
      when /^iso[-_]?(\d{4})-?(\w{1,2})$/
        "ISO-#{$1}-#{$2}"

# "ISO-2022-JP-KDDI"  and alike
      when /^iso[-_]?(\d{4})-?(\w{1,2})-?(\w*)$/
        "ISO-#{$1}-#{$2}-#{$3}"

# UTF-8, UTF-32BE and alike
      when /^utf[\-_]?(\d{1,2})?(\w{1,2})$/
        "UTF-#{$1}#{$2}".gsub(/\A(UTF-(?:16|32))\z/, '\\1BE')

# Windows-1252 and alike
      when /^windows-?(.*)$/
        "Windows-#{$1}"

when '8bit'
        Encoding::ASCII_8BIT

# alternatives/misspellings of us-ascii seen in the wild
      when /^iso[-_]?646(-us)?$/, 'us=ascii'
        Encoding::ASCII

# Microsoft-specific alias for MACROMAN
      when 'macintosh'
        Encoding::MACROMAN

# Microsoft-specific alias for CP949 (Korean)
      when 'ks_c_5601-1987'
        Encoding::CP949

# Wrongly written Shift_JIS (Japanese)
      when 'shift-jis'
        Encoding::Shift_JIS

# GB2312 (Chinese charset) is a subset of GB18030 (its replacement)
      when 'gb2312'
        Encoding::GB18030

when 'cp-850'
        Encoding::CP850

when 'latin2'
        Encoding::ISO_8859_2

else
        charset
      end

convert_to_encoding(encoding)
    end

if "string".respond_to?(:byteslice)
      def Ruby19.string_byteslice(str, *args)
        str.byteslice(*args)
      end
    else
      def Ruby19.string_byteslice(str, *args)
        str.unpack('C*').slice(*args).pack('C*').force_encoding(str.encoding)
      end
    end

class << self
      private

def convert_to_encoding(encoding)
        if encoding.is_a?(Encoding)
          encoding
        else
          # Fall back to ASCII for charsets that Ruby doesn't recognize
          begin
            Encoding.find(encoding)
          rescue ArgumentError
            Encoding::BINARY
          end
        end
      end

def transcode_to_scrubbed_utf8(str)
        decoded = str.encode(Encoding::UTF_8, :undef => :replace, :invalid => :replace, :replace => "�")
        decoded.valid_encoding? ? decoded : decoded.encode(Encoding::UTF_16LE, :invalid => :replace, :replace => "�").encode(Encoding::UTF_8)
      end
    end
  end
end

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25 Nov. 2022

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JezK

Edit File: ruby_1_9.rb

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