latin1conv.rb

module Latin1Conv

	require 'cgi'
	
	LATIN1_CONVERT_TABLE = {
		' ' => ' ',
		'¡' => '¡',
		'¢' => '¢',
		'£' => '£',
		'¤' => '¤',
		'¥' => '¥',
		'¦' => '¦',
		'§' => '§',
		'¨' => '¨',
		'©' => '©',
		'ª' => 'ª',
		'«' => '«',
		'¬' => '¬',
		'­' => '­',
		'®' => '®',
		'¯' => '¯',
		'°' => '°',
		'±' => '±',
		'²' => '²',
		'³' => '³',
		'´' => '´',
		'µ' => 'µ',
		'¶' => '¶',
		'·' => '·',
		'¸' => '¸',
		'¹' => '¹',
		'º' => 'º',
		'»' => '»',
		'¼' => '¼',
		'½' => '½',
		'¾' => '¾',
		'¿' => '¿',
		'À' => 'À',
		'Á' => 'Á',
		'Â' => 'Â',
		'Ã' => 'Ã',
		'Ä' => 'Ä',
		'Å' => 'Å',
		'Æ' => 'Æ',
		'Ç' => 'Ç',
		'È' => 'È',
		'É' => 'É',
		'Ê' => 'Ê',
		'Ë' => 'Ë',
		'Ì' => 'Ì',
		'Í' => 'Í',
		'Î' => 'Î',
		'Ï' => 'Ï',
		'Ð' => 'Ð',
		'Ñ' => 'Ñ',
		'Ò' => 'Ò',
		'Ó' => 'Ó',
		'Ô' => 'Ô',
		'Õ' => 'Õ',
		'Ö' => 'Ö',
		'×' => '×',
		'Ø' => 'Ø',
		'Ù' => 'Ù',
		'Ú' => 'Ú',
		'Û' => 'Û',
		'Ü' => 'Ü',
		'Ý' => 'Ý',
		'Þ' => 'Þ',
		'ß' => 'ß',
		'à' => 'à',
		'á' => 'á',
		'â' => 'â',
		'ã' => 'ã',
		'ä' => 'ä',
		'å' => 'å',
		'æ' => 'æ',
		'ç' => 'ç',
		'è' => 'è',
		'é' => 'é',
		'ê' => 'ê',
		'ë' => 'ë',
		'ì' => 'ì',
		'í' => 'í',
		'î' => 'î',
		'ï' => 'ï',
		'ð' => 'ð',
		'ñ' => 'ñ',
		'ò' => 'ò',
		'ó' => 'ó',
		'ô' => 'ô',
		'õ' => 'õ',
		'ö' => 'ö',
		'÷' => '÷',
		'ø' => 'ø',
		'ù' => 'ù',
		'ú' => 'ú',
		'û' => 'û',
		'ü' => 'ü',
		'ý' => 'ý',
		'þ' => 'þ',
		'ÿ' => 'ÿ'
	}

	def unescapeHTML
		return CGI.unescapeHTML(self.gsub(/(&#\d+;)/){|pat| LATIN1_CONVERT_TABLE[pat]||pat})
	end

end


if $0 == __FILE__ then
	class String; include Latin1Conv; end
	latin1 = ' ¥ªÈÿ'
	puts latin1
	puts latin1.unescapeHTML
end

result.txt

 ¥ªÈÿ
 ¥ªÈÿ