
#-----------------------------------------------------------------
# decode.pl
#
# аВТОР: нИФОНТОВ еВГЕНИЙ
# ИСПРАВЛЕНО
#
# пРОЦЕДУРЫ ДЛЯ УГАДЫВАНИЯ КИРИЛЛИЧЕСКОЙ КОДИРОВКИ wEB-КЛИЕНТА
# И ПЕРЕКОДИРОВАНИЯ HTML-ДОКУМЕНТА В КОДИРОВКУ КЛИЕНТА
#------------------------------------------------------------------

sub GuessHTTP_ACCEPT{
        local($string);
        $string=$ENV{HTTP_ACCEPT};
           if ( $string=~ /koi/i        ){ $GuessAnswer='KOI';        }
        elsif ( $string=~ /volapuk/i    ){ $GuessAnswer='volapuk';    }
        elsif ( $string=~ /cp1251|win/i ){ $GuessAnswer='windows';    }
        elsif ( $string=~ /cp866|alt/i  ){ $GuessAnswer='alt';        }
        elsif ( $string=~ /iso-8859-5/i ){ $GuessAnswer='iso_8859_5'; }
        else return 0;
           return 1 ;
} # end GuessHTTP_ACCEPT


sub GuessHTTP_USER_AGENT{
        local($string);
        $string=$ENV{HTTP_USER_AGENT};
           if ($string=~ /Lynx/)  { $GuessAnswer='KOI';     }
        elsif ($string=~ /X/)     { $GuessAnswer='KOI';     }
        elsif ($string=~ /Win/i)  { $GuessAnswer='windows'; }
        else return 0;
        return 1
} # sub GuessHTTP_USER_AGENT

sub CharsetGuess {
        if ( &GuessHTTP_ACCEPT )     { return 1 };
         &GuessHTTP_USER_AGENT )
}

sub ChooseCharset{
        if (@_) { local (*in) = @_; }
        print <<EOT;
Content-type: text/html

<HTML>
<HR>
<h2>Can't Guess Your Cyrillic Charset</h2>
<HR>
</HTML>
EOT
} # sub ChooseCharset

sub Guess_Decode_Send{
        if (@_) { local (*in) = @_; }
        if (&CharsetGuess) {
                if ($GuessAnswer eq 'KOI') {print @in}
                else{
                    local($decodeprog)="koi2${GuessAnswer}";
                    open(PIPE,"|/usr/local/www/cgi-bin/tools/decoders/$decodeprog");
                    print PIPE @in;
                    close(PIPE);
                }
        }
        else { &ChooseCharset(*in) };
} # sub Guess_Decode_Send
1;