0ct0pu5
/
squirrelmail


			
							12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788899091929394959697989910010110210310410510610710810911011111211311411511611711811912012112212312412512612712812913013113213313413513613713813914014114214314414514614714814915015115215315415515615715815916016116216316416516616716816917017117217317417517617717817918018118218318418518618718818919019119219319419519619719819920020120220320420520620720820921021121221321421521621721821922022122222322422522622722822923023123223323423523623723823924024124224324424524624724824925025125225325425525625725825926026126226326426526626726826927027127227327427527627727827928028128228328428528628728828929029129229329429529629729829930030130230330430530630730830931031131231331431531631731831932032132232332432532632732832933033133233333433533633733833934034134234334434534634734834935035135235335435535635735835936036136236336436536636736836937037137237337437537637737837938038138238338438538638738838939039139239339439539639739839940040140240340440540640740840941041141241341441541641741841942042142242342442542642742842943043143243343443543643743843944044144244344444544644744844945045145245345445545645745845946046146246346446546646746846947047147247347447547647747847948048148248348448548648748848949049149249349449549649749849950050150250350450550650750850951051151251351451551651751851952052152252352452552652752852953053153253353453553653753853954054154254354454554654754854955055155255355455555655755855956056156256356456556656756856957057157257357457557657757857958058158258358458558658758858959059159259359459559659759859960060160260360460560660760860961061161261361461561661761861962062162262362462562662762862963063163263363463563663763863964064164264364464564664764864965065165265365465565665765865966066166266366466566666766866967067167267367467567667767867968068168268368468568668768868969069169269369469569669769869970070170270370470570670770870971071171271371471571671771871972072172272372472572672772872973073173273373473573673773873974074174274374474574674774874975075175275375475575675775875976076176276376476576676776876977077177277377477577677777877978078178278378478578678778878979079179279379479579679779879980080180280380480580680780880981081181281381481581681781881982082182282382482582682782882983083183283383483583683783883984084184284384484584684784884985085185285385485585685785885986086186286386486586686786886987087187287387487587687787887988088188288388488588688788888989089189289389489589689789889990090190290390490590690790890991091191291391491591691791891992092192292392492592692792892993093193293393493593693793893994094194294394494594694794894995095195295395495595695795895996096196296396496596696796896997097197297397497597697797897998098198298398498598698798898999099199299399499599699799899910001001100210031004100510061007100810091010101110121013101410151016101710181019102010211022102310241025102610271028102910301031103210331034103510361037103810391040104110421043104410451046104710481049105010511052105310541055105610571058105910601061106210631064106510661067106810691070107110721073107410751076107710781079108010811082108310841085108610871088108910901091109210931094109510961097109810991100110111021103110411051106110711081109111011111112111311141115111611171118111911201121112211231124112511261127112811291130113111321133113411351136113711381139114011411142114311441145114611471148114911501151115211531154115511561157115811591160116111621163116411651166116711681169117011711172117311741175117611771178117911801181118211831184118511861187118811891190119111921193119411951196119711981199120012011202120312041205120612071208120912101211121212131214121512161217121812191220122112221223122412251226122712281229123012311232123312341235123612371238123912401241124212431244124512461247124812491250125112521253125412551256125712581259126012611262126312641265126612671268126912701271127212731274127512761277127812791280128112821283128412851286128712881289129012911292129312941295129612971298129913001301130213031304130513061307130813091310131113121313131413151316131713181319132013211322132313241325132613271328132913301331133213331334133513361337133813391340134113421343134413451346134713481349135013511352135313541355135613571358135913601361136213631364136513661367136813691370137113721373137413751376137713781379138013811382138313841385138613871388138913901391139213931394139513961397139813991400140114021403140414051406140714081409141014111412141314141415141614171418141914201421142214231424142514261427142814291430143114321433143414351436143714381439144014411442144314441445144614471448144914501451145214531454145514561457145814591460146114621463146414651466146714681469147014711472147314741475147614771478147914801481148214831484148514861487148814891490149114921493149414951496149714981499150015011502150315041505150615071508150915101511151215131514151515161517151815191520152115221523152415251526152715281529153015311532153315341535153615371538153915401541154215431544154515461547154815491550155115521553155415551556155715581559156015611562156315641565156615671568156915701571157215731574157515761577157815791580158115821583158415851586158715881589159015911592159315941595159615971598159916001601160216031604160516061607160816091610161116121613161416151616161716181619162016211622162316241625162616271628
							<?php

/**
 * mime.php
 *
 * Copyright (c) 1999-2002 The SquirrelMail Project Team
 * Licensed under the GNU GPL. For full terms see the file COPYING.
 *
 * This contains the functions necessary to detect and decode MIME
 * messages.
 *
 * $Id$
 */

require_once(SM_PATH . 'functions/imap.php');
require_once(SM_PATH . 'functions/attachment_common.php');

/* --------------------------------------------------------------------------------- */
/* MIME DECODING                                                                     */
/* --------------------------------------------------------------------------------- */

/* This function gets the structure of a message and stores it in the "message" class.
 * It will return this object for use with all relevant header information and
 * fully parsed into the standard "message" object format.
 */

function mime_structure ($bodystructure, $flags=array()) {

    /* Isolate the body structure and remove beginning and end parenthesis. */
    $read = trim(substr ($bodystructure, strpos(strtolower($bodystructure), 'bodystructure') + 13));
    $read = trim(substr ($read, 0, -1));
    $msg =& new Message();
    $res  = $msg->parseStructure($read);
    $msg  = $res[0];
    if (!is_object($msg)) {
        include_once(SM_PATH . 'functions/display_messages.php');
        global $color, $mailbox;
        displayPageHeader( $color, urldecode($mailbox) );
        echo "<BODY TEXT=\"$color[8]\" BGCOLOR=\"$color[4]\" LINK=\"$color[7]\" VLINK=\"$color[7]\" ALINK=\"$color[7]\">\n\n" .
         '<CENTER>';
        $errormessage  = _("SquirrelMail could not decode the bodystructure of the message");
        $errormessage .= '<BR>'._("the provided bodystructure by your imap-server").':<BR><BR>';
        $errormessage .= '<table><tr><td>' . htmlspecialchars($read) . '</td></tr></table>';
        plain_error_message( $errormessage, $color );
        echo '</body></html>';
        exit;
    }
    $msg->setEnt('0');
    if (count($flags)) {
        foreach ($flags as $flag) {
            $char = strtoupper($flag{1});
            switch ($char) {
                case 'S':
                    if (strtolower($flag) == '\\seen') {
                        $msg->is_seen = true;
                    }
                    break;
                case 'A':
                    if (strtolower($flag) == '\\answered') {
                        $msg->is_answered = true;
                    }
                    break;
                case 'D':
                    if (strtolower($flag) == '\\deleted') {
                        $msg->is_deleted = true;
                    }
                    break;
                case 'F':
                    if (strtolower($flag) == '\\flagged') {
                        $msg->is_flagged = true;
                    }
                    break;
                case 'M':
                    if (strtolower($flag) == '$mdnsent') {
                        $msg->is_mdnsent = true;
                    }
                    break;
                default:
                    break;
            }
        }
    }
    //    listEntities($msg);
    return $msg;
}

/* This starts the parsing of a particular structure.  It is called recursively,
 * so it can be passed different structures.  It returns an object of type
 * $message.
 * First, it checks to see if it is a multipart message.  If it is, then it
 * handles that as it sees is necessary.  If it is just a regular entity,
 * then it parses it and adds the necessary header information (by calling out
 * to mime_get_elements()
 */

function mime_fetch_body($imap_stream, $id, $ent_id) {
    global $uid_support; 
    /* Do a bit of error correction.  If we couldn't find the entity id, just guess
     * that it is the first one.  That is usually the case anyway.
     */
    if (!$ent_id) {
        $ent_id = 1;
    }
    $cmd = "FETCH $id BODY[$ent_id]";

    $data = sqimap_run_command ($imap_stream, $cmd, true, $response, $message, $uid_support);
    do {
        $topline = trim(array_shift($data));
    } while($topline && ($topline[0] == '*') && !preg_match('/\* [0-9]+ FETCH.*/i', $topline)) ;

    $wholemessage = implode('', $data);
    if (ereg('\\{([^\\}]*)\\}', $topline, $regs)) {
        $ret = substr($wholemessage, 0, $regs[1]);
        /* There is some information in the content info header that could be important
         * in order to parse html messages. Let's get them here.
         */
        if ($ret{0} == '<') {
            $data = sqimap_run_command ($imap_stream, "FETCH $id BODY[$ent_id.MIME]", true, $response, $message, $uid_support);
        }
    } else if (ereg('"([^"]*)"', $topline, $regs)) {
        $ret = $regs[1];
    } else {
        global $where, $what, $mailbox, $passed_id, $startMessage;
        $par = 'mailbox=' . urlencode($mailbox) . '&amp;passed_id=' . $passed_id;
        if (isset($where) && isset($what)) {
            $par .= '&amp;where=' . urlencode($where) . '&amp;what=' . urlencode($what);
        } else {
            $par .= '&amp;startMessage=' . $startMessage . '&amp;show_more=0';
        }
        $par .= '&amp;response=' . urlencode($response) .
                '&amp;message='  . urlencode($message)  .
                '&amp;topline='  . urlencode($topline);

        echo   '<tt><br>' .
               '<table width="80%"><tr>' .
               '<tr><td colspan=2>' .
               _("Body retrieval error. The reason for this is most probably that the message is malformed.") .
               '</td></tr>' .
               '<tr><td><b>' . _("Command:") . "</td><td>$cmd</td></tr>" .
               '<tr><td><b>' . _("Response:") . "</td><td>$response</td></tr>" .
               '<tr><td><b>' . _("Message:") . "</td><td>$message</td></tr>" .
               '<tr><td><b>' . _("FETCH line:") . "</td><td>$topline</td></tr>" .
               "</table><BR></tt></font><hr>";

        $data = sqimap_run_command ($imap_stream, "FETCH $passed_id BODY[]", true, $response, $message, $uid_support);
        array_shift($data);
        $wholemessage = implode('', $data);

        $ret = $wholemessage;
    }
    return $ret;
}

function mime_print_body_lines ($imap_stream, $id, $ent_id, $encoding) {
    global $uid_support;
    /* Do a bit of error correction.  If we couldn't find the entity id, just guess
     * that it is the first one.  That is usually the case anyway.
     */
    if (!$ent_id) {
        $ent_id = 1;
    }
    $sid = sqimap_session_id($uid_support);
    /* Don't kill the connection if the browser is over a dialup
     * and it would take over 30 seconds to download it.
     * Don´t call set_time_limit in safe mode.
     */

    if (!ini_get('safe_mode')) {
        set_time_limit(0);
    }
    if ($uid_support) {
       $sid_s = substr($sid,0,strpos($sid, ' '));
    } else {
       $sid_s = $sid;
    }

    $body = mime_fetch_body ($imap_stream, $id, $ent_id);
    echo decodeBody($body, $encoding);
    return;
/*
    fputs ($imap_stream, "$sid FETCH $id BODY[$ent_id]\r\n");
    $cnt = 0;
    $continue = true;
    $read = fgets ($imap_stream,8192);


    // This could be bad -- if the section has sqimap_session_id() . ' OK'
    // or similar, it will kill the download.
    while (!ereg("^".$sid_s." (OK|BAD|NO)(.*)$", $read, $regs)) {
        if (trim($read) == ')==') {
            $read1 = $read;
            $read = fgets ($imap_stream,4096);
            if (ereg("^".$sid." (OK|BAD|NO)(.*)$", $read, $regs)) {
                return;
            } else {
                echo decodeBody($read1, $encoding) .
                     decodeBody($read, $encoding);
            }
        } else if ($cnt) {
            echo decodeBody($read, $encoding);
        }
        $read = fgets ($imap_stream,4096);
        $cnt++;
//      break;
    }
*/
}

/* -[ END MIME DECODING ]----------------------------------------------------------- */

/* This is here for debugging purposes.  It will print out a list
 * of all the entity IDs that are in the $message object.
 */
function listEntities ($message) {
    if ($message) {
        echo "<tt>" . $message->entity_id . ' : ' . $message->type0 . '/' . $message->type1 . ' parent = '. $message->parent->entity_id. '<br>';
        for ($i = 0; isset($message->entities[$i]); $i++) {
            echo "$i : ";
            $msg = listEntities($message->entities[$i]);

            if ($msg) {
                echo "return: ";
                return $msg;
            }
        }
    }
}

function getPriorityStr($priority) {
    $priority_level = substr($priority,0,1);

    switch($priority_level) {
        /* Check for a higher then normal priority. */
        case '1':
        case '2':
            $priority_string = _("High");
            break;

        /* Check for a lower then normal priority. */
        case '4':
        case '5':
            $priority_string = _("Low");
            break;

        /* Check for a normal priority. */
        case '3':
        default:
            $priority_level = '3';
            $priority_string = _("Normal");
            break;

    }
    return $priority_string;
}

/* returns a $message object for a particular entity id */
function getEntity ($message, $ent_id) {
    return $message->getEntity($ent_id);
}

/* translateText
 * Extracted from strings.php 23/03/2002
 */

function translateText(&$body, $wrap_at, $charset) {
    global $where, $what;   /* from searching */
    global $color;          /* color theme */

    require_once(SM_PATH . 'functions/url_parser.php');

    $body_ary = explode("\n", $body);
    for ($i=0; $i < count($body_ary); $i++) {
        $line = $body_ary[$i];
        if (strlen($line) - 2 >= $wrap_at) {
            sqWordWrap($line, $wrap_at);
        }
        $line = charset_decode($charset, $line);
        $line = str_replace("\t", '        ', $line);

        parseUrl ($line);

        $quotes = 0;
        $pos = 0;
        $j = strlen($line);

        while ($pos < $j) {
            if ($line[$pos] == ' ') {
                $pos++;
            } else if (strpos($line, '&gt;', $pos) === $pos) {
                $pos += 4;
                $quotes++;
            } else {
                break;
            }
        }

        if ($quotes > 1) {
            if (!isset($color[14])) {
                $color[14] = '#FF0000';
            }
            $line = '<FONT COLOR="' . $color[14] . '">' . $line . '</FONT>';
        } elseif ($quotes) {
            if (!isset($color[13])) {
                $color[13] = '#800000';
            }
            $line = '<FONT COLOR="' . $color[13] . '">' . $line . '</FONT>';
        }

        $body_ary[$i] = $line;
    }
    $body = '<pre>' . implode("\n", $body_ary) . '</pre>';
}


/* This returns a parsed string called $body. That string can then
 * be displayed as the actual message in the HTML. It contains
 * everything needed, including HTML Tags, Attachments at the
 * bottom, etc.
 */
function formatBody($imap_stream, $message, $color, $wrap_at, $ent_num, $id, $mailbox='INBOX') {
    /* This if statement checks for the entity to show as the
     * primary message. To add more of them, just put them in the
     * order that is their priority.
     */
    global $startMessage, $username, $key, $imapServerAddress, $imapPort,
           $show_html_default, $has_unsafe_images, $sort;

    if ( (float)substr(PHP_VERSION,0,3) < 4.1 ) {
        global $_GET;
    }
    if(isset($_GET['view_unsafe_images'])) {
        $view_unsafe_images = $_GET['view_unsafe_images'];
    }

    $has_unsafe_images= 0;
    $body = '';
    $urlmailbox = urlencode($mailbox);
    $body_message = getEntity($message, $ent_num);
    if (($body_message->header->type0 == 'text') ||
        ($body_message->header->type0 == 'rfc822')) {
        $body = mime_fetch_body ($imap_stream, $id, $ent_num);
        $body = decodeBody($body, $body_message->header->encoding);
        $hookResults = do_hook("message_body", $body);
        $body = $hookResults[1];

        /* If there are other types that shouldn't be formatted, add
         * them here.
         */

        if ($body_message->header->type1 == 'html') {
            if ($show_html_default <> 1) {
                $entity_conv = array('&nbsp;' => ' ',
                                     '<p>'    => "\n",
                                     '<br>'   => "\n",
                                     '<P>'    => "\n",
                                     '<BR>'   => "\n",
                                     '&gt;'   => '>',
                                     '&lt;'   => '<');
                $body = strtr($body, $entity_conv);
                $body = strip_tags($body);
                $body = trim($body);
                translateText($body, $wrap_at,
                              $body_message->header->getParameter('charset'));
            } else {
                $body = magicHTML($body, $id, $message, $mailbox);
            }
        } else {
            translateText($body, $wrap_at,
                          $body_message->header->getParameter('charset'));
        }

        if ($has_unsafe_images) {
            if ($view_unsafe_images) {
                $untext = '">' . _("Hide Unsafe Images");
            } else {
                $untext = '&amp;view_unsafe_images=1">' . _("View Unsafe Images");
            }
            $body .= '<center><small><a href="read_body.php?passed_id=' . $id .
                     '&amp;passed_ent_id=' . $message->entity_id . '&amp;mailbox=' . $urlmailbox .
                     '&amp;sort=' . $sort . '&amp;startMessage=' . $startMessage . '&amp;show_more=0' .
                     $untext . '</a></small></center><br>' . "\n";
        }
    }
    return $body;
}


function formatAttachments($message, $exclude_id, $mailbox, $id) {
    global $where, $what, $startMessage, $color;
    static $ShownHTML = 0;

    $att_ar = $message->getAttachments($exclude_id);

    if (!count($att_ar)) return '';

    $attachments = '';

    $urlMailbox = urlencode($mailbox);

    foreach ($att_ar as $att) {
        $ent = urldecode($att->entity_id);
        $header = $att->header;
        $type0 = strtolower($header->type0);
        $type1 = strtolower($header->type1);
        $name = '';
        $links['download link']['text'] = _("download");
        $links['download link']['href'] =
                "../src/download.php?absolute_dl=true&amp;passed_id=$id&amp;mailbox=$urlMailbox&amp;ent_id=$ent";
        $ImageURL = '';
        if ($type0 =='message' && $type1 == 'rfc822') {
            $default_page = '../src/read_body.php';
            $rfc822_header = $att->rfc822_header;
            $filename = decodeHeader($rfc822_header->subject);

            $from_o = $rfc822_header->from;
            if (is_object($from_o)) {
                $from_name = $from_o->getAddress(false);
            } else {
                $from_name = _("Unknown sender");
            }
            $from_name = decodeHeader(htmlspecialchars($from_name));
            $description = $from_name;
        } else {
            $default_page = '../src/download.php';
            if (is_object($header->disposition)) {
                $filename = decodeHeader($header->disposition->getProperty('filename'));
                if (trim($filename) == '') {
                    $name = decodeHeader($header->disposition->getProperty('name'));
                    if (trim($name) == '') {
                        if (trim( $header->id ) == '') {
                            $filename = 'untitled-[' . $ent . ']' ;
                        } else {
                            $filename = 'cid: ' . $header->id;
                        }
                    } else {
                        $filename = $name;
                    }
                }
            } else {
                if (trim( $header->id ) == '') {
                    $filename = 'untitled-[' . $ent . ']' ;
                } else {
                    $filename = 'cid: ' . $header->id;
                }
            }

            if ($header->description) {
                $description = htmlspecialchars($header->description);
            } else {
                $description = '';
            }
        }

        $display_filename = $filename;
        if (isset($passed_ent_id)) {
            $passed_ent_id_link = '&amp;passed_ent_id='.$passed_ent_id;
        } else {
            $passed_ent_id_link = '';
        }
        $defaultlink = $default_page . "?startMessage=$startMessage"
                     . "&amp;passed_id=$id&amp;mailbox=$urlMailbox"
                     . '&amp;ent_id='.$ent.$passed_ent_id_link.'&amp;absolute_dl=true';
        if ($where && $what) {
           $defaultlink .= '&amp;where='. urlencode($where).'&amp;what='.urlencode($what);
        }
        /* This executes the attachment hook with a specific MIME-type.
         * If that doesn't have results, it tries if there's a rule
         * for a more generic type.
         */
        $hookresults = do_hook("attachment $type0/$type1", $links,
                               $startMessage, $id, $urlMailbox, $ent, $defaultlink,
                               $display_filename, $where, $what);
        if(count($hookresults[1]) <= 1) {
            $hookresults = do_hook("attachment $type0/*", $links,
                                   $startMessage, $id, $urlMailbox, $ent, $defaultlink,
                                   $display_filename, $where, $what);
        }

        $links = $hookresults[1];
        $defaultlink = $hookresults[6];

        $attachments .= '<TR><TD>' .
                        "<A HREF=\"$defaultlink\">$display_filename</A>&nbsp;</TD>" .
                        '<TD><SMALL><b>' . show_readable_size($header->size) .
                        '</b>&nbsp;&nbsp;</small></TD>' .
                        "<TD><SMALL>[ $type0/$type1 ]&nbsp;</SMALL></TD>" .
                        '<TD><SMALL>';
        $attachments .= '<b>' . $description . '</b>';
        $attachments .= '</SMALL></TD><TD><SMALL>&nbsp;';

        $skipspaces = 1;
        foreach ($links as $val) {
            if ($skipspaces) {
                $skipspaces = 0;
            } else {
                $attachments .= '&nbsp;&nbsp;|&nbsp;&nbsp;';
            }
            $attachments .= '<a href="' . $val['href'] . '">' .  $val['text'] . '</a>';
        }
        unset($links);
        $attachments .= "</TD></TR>\n";
    }
    return $attachments;
}

/* This function decodes the body depending on the encoding type. */
function decodeBody($body, $encoding) {
    global $languages, $squirrelmail_language;
    global $show_html_default;

    $body = str_replace("\r\n", "\n", $body);
    $encoding = strtolower($encoding);

    if ($encoding == 'quoted-printable' ||
        $encoding == 'quoted_printable') {
        $body = quoted_printable_decode($body);

        while (ereg("=\n", $body)) {
            $body = ereg_replace ("=\n", '', $body);
        }

    } else if ($encoding == 'base64') {
        $body = base64_decode($body);
    }

    if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
        function_exists($languages[$squirrelmail_language]['XTRA_CODE'])) {
        $body = $languages[$squirrelmail_language]['XTRA_CODE']('decode', $body);
    }

    // All other encodings are returned raw.
    return $body;
}

/*
 * This functions decode strings that is encoded according to
 * RFC1522 (MIME Part Two: Message Header Extensions for Non-ASCII Text).
 * Patched by Christian Schmidt <christian@ostenfeld.dk>  23/03/2002
 */
function decodeHeader ($string, $utfencode=true) {
    global $languages, $squirrelmail_language;
    if (is_array($string)) {
        $string = implode("\n", $string);
    }

    if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
        function_exists($languages[$squirrelmail_language]['XTRA_CODE'])) {
        $string = $languages[$squirrelmail_language]['XTRA_CODE']('decodeheader', $string);
    }

    $i = 0;
    while (preg_match('/^(.{' . $i . '})(.*)=\?([^?]*)\?(Q|B)\?([^?]*)\?=/Ui', 
                      $string, $res)) {
        $prefix = $res[1];
        /* Ignore white-space between consecutive encoded-words. */
        if (strspn($res[2], " \t") != strlen($res[2])) {
            $prefix .= $res[2];
        }

        if (ucfirst($res[4]) == 'B') {
            $replace = base64_decode($res[5]);
        } else {
            $replace = str_replace('_', ' ', $res[5]);
            $replace = preg_replace('/=([0-9a-f]{2})/ie', 'chr(hexdec("\1"))', 
                                    $replace);
            /* Only encode into entities by default. Some places
             * don't need the encoding, like the compose form.
             */
            if ($utfencode) {
                $replace = charset_decode($res[3], $replace);
            }
        }
        $string = $prefix . $replace . substr($string, strlen($res[0]));
        $i = strlen($prefix) + strlen($replace);
    }
    return $string;
}

/*
 * Encode a string according to RFC 1522 for use in headers if it
 * contains 8-bit characters or anything that looks like it should
 * be encoded.
 */
function encodeHeader ($string) {
    global $default_charset, $languages, $squirrelmail_language;

    if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
        function_exists($languages[$squirrelmail_language]['XTRA_CODE'])) {
        return  $languages[$squirrelmail_language]['XTRA_CODE']('encodeheader', $string);
    }

    // Encode only if the string contains 8-bit characters or =?
    $j = strlen($string);
    $l = strstr($string, '=?');         // Must be encoded ?
    $ret = '';
    for($i = 0; $i < $j; ++$i) {
        switch($string{$i}) {
            case '=':
                $ret .= '=3D';
                break;
            case '?':
                $ret .= '=3F';
                break;
            case '_':
                $ret .= '=5F';
                break;
            case ' ':
                $ret .= '_';
                break;
            default:
                $k = ord($string{$i});
                if ($k > 126) {
                    $ret .= sprintf("=%02X", $k);
                    $l = TRUE;
                } else {
                    $ret .= $string{$i};
                }
                break;
        }
    }

    if ($l) {
        $string = "=?$default_charset?Q?$ret?=";
    }

    return $string;
}

/* This function trys to locate the entity_id of a specific mime element */
function find_ent_id($id, $message) {
    for ($i = 0, $ret = ''; $ret == '' && $i < count($message->entities); $i++) {
        if ($message->entities[$i]->header->type0 == 'multipart')  {
            $ret = find_ent_id($id, $message->entities[$i]);
        } else {
            if (strcasecmp($message->entities[$i]->header->id, $id) == 0) {
//                if (sq_check_save_extension($message->entities[$i])) {
                    return $message->entities[$i]->entity_id;
//                } 
            }
        }
    }
    return $ret;
}

function sq_check_save_extension($message) {
    $filename = $message->getFilename();
    $ext = substr($filename, strrpos($filename,'.')+1);
    $save_extensions = array('jpg','jpeg','gif','png','bmp');
    return in_array($ext, $save_extensions);
}


/**
 ** HTMLFILTER ROUTINES
 */

/**
 * This function returns the final tag out of the tag name, an array
 * of attributes, and the type of the tag. This function is called by 
 * sq_sanitize internally.
 *
 * @param  $tagname  the name of the tag.
 * @param  $attary   the array of attributes and their values
 * @param  $tagtype  The type of the tag (see in comments).
 * @return           a string with the final tag representation.
 */
function sq_tagprint($tagname, $attary, $tagtype){
    $me = 'sq_tagprint';

    if ($tagtype == 2){
        $fulltag = '</' . $tagname . '>';
    } else {
        $fulltag = '<' . $tagname;
        if (is_array($attary) && sizeof($attary)){
            $atts = Array();
            while (list($attname, $attvalue) = each($attary)){
                array_push($atts, "$attname=$attvalue");
            }
            $fulltag .= ' ' . join(" ", $atts);
        }
        if ($tagtype == 3){
            $fulltag .= ' /';
        }
        $fulltag .= '>';
    }
    return $fulltag;
}

/**
 * A small helper function to use with array_walk. Modifies a by-ref
 * value and makes it lowercase.
 *
 * @param  $val a value passed by-ref.
 * @return      void since it modifies a by-ref value.
 */
function sq_casenormalize(&$val){
    $val = strtolower($val);
}

/**
 * This function skips any whitespace from the current position within
 * a string and to the next non-whitespace value.
 * 
 * @param  $body   the string
 * @param  $offset the offset within the string where we should start
 *                 looking for the next non-whitespace character.
 * @return         the location within the $body where the next
 *                 non-whitespace char is located.
 */
function sq_skipspace($body, $offset){
    $me = 'sq_skipspace';
    preg_match('/^(\s*)/s', substr($body, $offset), $matches);
    if (sizeof($matches{1})){
        $count = strlen($matches{1});
        $offset += $count;
    }
    return $offset;
}

/**
 * This function looks for the next character within a string.  It's
 * really just a glorified "strpos", except it catches if failures
 * nicely.
 *
 * @param  $body   The string to look for needle in.
 * @param  $offset Start looking from this position.
 * @param  $needle The character/string to look for.
 * @return         location of the next occurance of the needle, or
 *                 strlen($body) if needle wasn't found.
 */
function sq_findnxstr($body, $offset, $needle){
    $me  = 'sq_findnxstr';
    $pos = strpos($body, $needle, $offset);
    if ($pos === FALSE){
        $pos = strlen($body);
    }
    return $pos;
}

/**
 * This function takes a PCRE-style regexp and tries to match it
 * within the string.
 *
 * @param  $body   The string to look for needle in.
 * @param  $offset Start looking from here.
 * @param  $reg    A PCRE-style regex to match.
 * @return         Returns a false if no matches found, or an array
 *                 with the following members:
 *                 - integer with the location of the match within $body
 *                 - string with whatever content between offset and the match
 *                 - string with whatever it is we matched
 */
function sq_findnxreg($body, $offset, $reg){
    $me = 'sq_findnxreg';
    $matches = Array();
    $retarr = Array();
    preg_match("%^(.*?)($reg)%s", substr($body, $offset), $matches);
    if (!$matches{0}){
        $retarr = false;
    } else {
        $retarr{0} = $offset + strlen($matches{1});
        $retarr{1} = $matches{1};
        $retarr{2} = $matches{2};
    }
    return $retarr;
}

/**
 * This function looks for the next tag.
 *
 * @param  $body   String where to look for the next tag.
 * @param  $offset Start looking from here.
 * @return         false if no more tags exist in the body, or
 *                 an array with the following members:
 *                 - string with the name of the tag
 *                 - array with attributes and their values
 *                 - integer with tag type (1, 2, or 3)
 *                 - integer where the tag starts (starting "<")
 *                 - integer where the tag ends (ending ">")
 *                 first three members will be false, if the tag is invalid.
 */
function sq_getnxtag($body, $offset){
    $me = 'sq_getnxtag';
    if ($offset > strlen($body)){
        return false;
    }
    $lt = sq_findnxstr($body, $offset, "<");
    if ($lt == strlen($body)){
        return false;
    }
    /**
     * We are here:
     * blah blah <tag attribute="value">
     * \---------^
     */
    $pos = sq_skipspace($body, $lt+1);
    if ($pos >= strlen($body)){
        return Array(false, false, false, $lt, strlen($body));
    }
    /**
     * There are 3 kinds of tags:
     * 1. Opening tag, e.g.:
     *    <a href="blah">
     * 2. Closing tag, e.g.:
     *    </a>
     * 3. XHTML-style content-less tag, e.g.:
     *    <img src="blah"/>
     */
    $tagtype = false;
    switch (substr($body, $pos, 1)){
        case '/':
            $tagtype = 2;
            $pos++;
            break;
        case '!':
            /**
             * A comment or an SGML declaration.
             */
            if (substr($body, $pos+1, 2) == "--"){
                $gt = strpos($body, "-->", $pos);
                if ($gt === false){
                    $gt = strlen($body);
                } else {
                    $gt += 2;
                }
                return Array(false, false, false, $lt, $gt);
            } else {
                $gt = sq_findnxstr($body, $pos, ">");
                return Array(false, false, false, $lt, $gt);
            }
            break;
        default:
            /**
             * Assume tagtype 1 for now. If it's type 3, we'll switch values
             * later.
             */
            $tagtype = 1;
            break;
    }

    $tag_start = $pos;
    $tagname = '';
    /**
     * Look for next [\W-_], which will indicate the end of the tag name.
     */
    $regary = sq_findnxreg($body, $pos, "[^\w\-_]");
    if ($regary == false){
        return Array(false, false, false, $lt, strlen($body));
    }
    list($pos, $tagname, $match) = $regary;
    $tagname = strtolower($tagname);

    /**
     * $match can be either of these:
     * '>'  indicating the end of the tag entirely.
     * '\s' indicating the end of the tag name.
     * '/'  indicating that this is type-3 xhtml tag.
     * 
     * Whatever else we find there indicates an invalid tag.
     */
    switch ($match){
        case '/':
            /**
             * This is an xhtml-style tag with a closing / at the
             * end, like so: <img src="blah"/>. Check if it's followed
             * by the closing bracket. If not, then this tag is invalid
             */
            if (substr($body, $pos, 2) == "/>"){
                $pos++;
                $tagtype = 3;
            } else {
                $gt = sq_findnxstr($body, $pos, ">");
                $retary = Array(false, false, false, $lt, $gt);
                return $retary;
            }
        case '>':
            return Array($tagname, false, $tagtype, $lt, $pos);
            break;
        default:
            /**
             * Check if it's whitespace
             */
            if (!preg_match('/\s/', $match)){
                /**
                 * This is an invalid tag! Look for the next closing ">".
                 */
                $gt = sq_findnxstr($body, $offset, ">");
                return Array(false, false, false, $lt, $gt);
            }
            break;
    }

    /**
     * At this point we're here:
     * <tagname  attribute='blah'>
     * \-------^
     *
     * At this point we loop in order to find all attributes.
     */
    $attname = '';
    $atttype = false;
    $attary = Array();

    while ($pos <= strlen($body)){
        $pos = sq_skipspace($body, $pos);
        if ($pos == strlen($body)){
            /**
             * Non-closed tag.
             */
            return Array(false, false, false, $lt, $pos);
        }
        /**
         * See if we arrived at a ">" or "/>", which means that we reached
         * the end of the tag.
         */
        $matches = Array();
        if (preg_match("%^(\s*)(>|/>)%s", substr($body, $pos), $matches)) {
            /**
             * Yep. So we did.
             */
            $pos += strlen($matches{1});
            if ($matches{2} == "/>"){
                $tagtype = 3;
                $pos++;
            }
            return Array($tagname, $attary, $tagtype, $lt, $pos);
        }

        /**
         * There are several types of attributes, with optional
         * [:space:] between members.
         * Type 1:
         *   attrname[:space:]=[:space:]'CDATA'
         * Type 2:
         *   attrname[:space:]=[:space:]"CDATA"
         * Type 3:
         *   attr[:space:]=[:space:]CDATA
         * Type 4:
         *   attrname
         *
         * We leave types 1 and 2 the same, type 3 we check for
         * '"' and convert to "&quot" if needed, then wrap in
         * double quotes. Type 4 we convert into:
         * attrname="yes".
         */
        $regary = sq_findnxreg($body, $pos, "[^\w\-_]");
        if ($regary == false){
            /**
             * Looks like body ended before the end of tag.
             */
            return Array(false, false, false, $lt, strlen($body));
        }
        list($pos, $attname, $match) = $regary;
        $attname = strtolower($attname);
        /**
         * We arrived at the end of attribute name. Several things possible
         * here:
         * '>'  means the end of the tag and this is attribute type 4
         * '/'  if followed by '>' means the same thing as above
         * '\s' means a lot of things -- look what it's followed by.
         *      anything else means the attribute is invalid.
         */
        switch($match){
            case '/':
                /**
                 * This is an xhtml-style tag with a closing / at the
                 * end, like so: <img src="blah"/>. Check if it's followed
                 * by the closing bracket. If not, then this tag is invalid
                 */
                if (substr($body, $pos, 2) == "/>"){
                    $pos++;
                    $tagtype = 3;
                } else {
                    $gt = sq_findnxstr($body, $pos, ">");
                    $retary = Array(false, false, false, $lt, $gt);
                    return $retary;
                }
            case '>':
                $attary{$attname} = '"yes"';
                return Array($tagname, $attary, $tagtype, $lt, $pos);
                break;
            default:
                /**
                 * Skip whitespace and see what we arrive at.
                 */
                $pos = sq_skipspace($body, $pos);
                $char = substr($body, $pos, 1);
                /**
                 * Two things are valid here:
                 * '=' means this is attribute type 1 2 or 3.
                 * \w means this was attribute type 4.
                 * anything else we ignore and re-loop. End of tag and
                 * invalid stuff will be caught by our checks at the beginning
                 * of the loop.
                 */
                if ($char == "="){
                    $pos++;
                    $pos = sq_skipspace($body, $pos);
                    /**
                     * Here are 3 possibilities:
                     * "'"  attribute type 1
                     * '"'  attribute type 2
                     * everything else is the content of tag type 3
                     */
                    $quot = substr($body, $pos, 1);
                    if ($quot == "'"){
                        $regary = sq_findnxreg($body, $pos+1, "\'");
                        if ($regary == false){
                            return Array(false, false, false, $lt, strlen($body));
                        }
                        list($pos, $attval, $match) = $regary;
                        $pos++;
                        $attary{$attname} = "'" . $attval . "'";
                    } else if ($quot == '"'){
                        $regary = sq_findnxreg($body, $pos+1, '\"');
                        if ($regary == false){
                            return Array(false, false, false, $lt, strlen($body));
                        }
                        list($pos, $attval, $match) = $regary;
                        $pos++;
                        $attary{$attname} = '"' . $attval . '"';
                    } else {
                        /**
                         * These are hateful. Look for \s, or >.
                         */
                        $regary = sq_findnxreg($body, $pos, "[\s>]");
                        if ($regary == false){
                            return Array(false, false, false, $lt, strlen($body));
                        }
                        list($pos, $attval, $match) = $regary;
                        /**
                         * If it's ">" it will be caught at the top.
                         */
                        $attval = preg_replace("/\"/s", "&quot;", $attval);
                        $attary{$attname} = '"' . $attval . '"';
                    }
                } else if (preg_match("|[\w/>]|", $char)) {
                    /**
                     * That was attribute type 4.
                     */
                    $attary{$attname} = '"yes"';
                } else {
                    /**
                     * An illegal character. Find next '>' and return.
                     */
                    $gt = sq_findnxstr($body, $pos, ">");
                    return Array(false, false, false, $lt, $gt);
                }
                break;
        }
    }
    /**
     * The fact that we got here indicates that the tag end was never
     * found. Return invalid tag indication so it gets stripped.
     */
    return Array(false, false, false, $lt, strlen($body));
}

/**
 * This function checks attribute values for entity-encoded values
 * and returns them translated into 8-bit strings so we can run
 * checks on them.
 *
 * @param  $attvalue A string to run entity check against.
 * @return           Translated value.
 */
function sq_deent($attvalue){
    $me = 'sq_deent';
    /**
     * See if we have to run the checks first. All entities must start
     * with "&".
     */
    if (strpos($attvalue, "&") === false){
        return $attvalue;
    }
    /**
     * Check named entities first.
     */
    $trans = get_html_translation_table(HTML_ENTITIES);
    /**
     * Leave &quot; in, as it can mess us up.
     */
    $trans = array_flip($trans);
    unset($trans{"&quot;"});
    while (list($ent, $val) = each($trans)){
        $attvalue = preg_replace("/$ent*(\W)/si", "$val\\1", $attvalue);
    }
    /**
     * Now translate numbered entities from 1 to 255 if needed.
     */
    if (strpos($attvalue, "#") !== false){
        $omit = Array(34, 39);
        for ($asc=1; $asc<256; $asc++){
            if (!in_array($asc, $omit)){
                $chr = chr($asc);
                $attvalue = preg_replace("/\&#0*$asc;*(\D)/si", "$chr\\1", 
                                         $attvalue);
                $attvalue = preg_replace("/\&#x0*".dechex($asc).";*(\W)/si",
                                         "$chr\\1", $attvalue);
            }
        }
    }
    return $attvalue;
}

/**
 * This function runs various checks against the attributes.
 *
 * @param  $tagname         String with the name of the tag.
 * @param  $attary          Array with all tag attributes.
 * @param  $rm_attnames     See description for sq_sanitize
 * @param  $bad_attvals     See description for sq_sanitize
 * @param  $add_attr_to_tag See description for sq_sanitize
 * @param  $message         message object
 * @param  $id              message id
 * @return                  Array with modified attributes.
 */
function sq_fixatts($tagname, 
                    $attary, 
                    $rm_attnames,
                    $bad_attvals,
                    $add_attr_to_tag,
                    $message,
                    $id,
                    $mailbox
                    ){
    $me = 'sq_fixatts';
    while (list($attname, $attvalue) = each($attary)){
        /**
         * See if this attribute should be removed.
         */
        foreach ($rm_attnames as $matchtag=>$matchattrs){
            if (preg_match($matchtag, $tagname)){
                foreach ($matchattrs as $matchattr){
                    if (preg_match($matchattr, $attname)){
                        unset($attary{$attname});
                        continue;
                    }
                }
            }
        }
        /**
         * Remove any entities.
         */
        $attvalue = sq_deent($attvalue);

        /**
         * Now let's run checks on the attvalues.
         * I don't expect anyone to comprehend this. If you do,
         * get in touch with me so I can drive to where you live and
         * shake your hand personally. :)
         */
        foreach ($bad_attvals as $matchtag=>$matchattrs){
            if (preg_match($matchtag, $tagname)){
                foreach ($matchattrs as $matchattr=>$valary){
                    if (preg_match($matchattr, $attname)){
                        /**
                         * There are two arrays in valary.
                         * First is matches.
                         * Second one is replacements
                         */
                        list($valmatch, $valrepl) = $valary;
                        $newvalue = 
                            preg_replace($valmatch, $valrepl, $attvalue);
                        if ($newvalue != $attvalue){
                            $attary{$attname} = $newvalue;
                        }
                    }
                }
            }
        }
        /**
         * Turn cid: urls into http-friendly ones.
         */
        if (preg_match("/^[\'\"]\s*cid:/si", $attvalue)){
            $attary{$attname} = sq_cid2http($message, $id, $attvalue, $mailbox);
        }
    }
    /**
     * See if we need to append any attributes to this tag.
     */
    foreach ($add_attr_to_tag as $matchtag=>$addattary){
        if (preg_match($matchtag, $tagname)){
            $attary = array_merge($attary, $addattary);
        }
    }
    return $attary;
}

/**
 * This function edits the style definition to make them friendly and
 * usable in squirrelmail.
 * 
 * @param  $message  the message object
 * @param  $id       the message id
 * @param  $content  a string with whatever is between <style> and </style>
 * @return           a string with edited content.
 */
function sq_fixstyle($message, $id, $content){
    global $view_unsafe_images;
    $me = 'sq_fixstyle';
    /**
     * First look for general BODY style declaration, which would be
     * like so:
     * body {background: blah-blah}
     * and change it to .bodyclass so we can just assign it to a <div>
     */
    $content = preg_replace("|body(\s*\{.*?\})|si", ".bodyclass\\1", $content);
    $secremoveimg = '../images/' . _("sec_remove_eng.png");
    /**
     * Fix url('blah') declarations.
     */
    $content = preg_replace("|url\(([\'\"])\s*\S+script\s*:.*?([\'\"])\)|si",
                            "url(\\1$secremoveimg\\2)", $content);
    /**
     * Fix url('https*://.*) declarations but only if $view_unsafe_images
     * is false.
     */
    if (!$view_unsafe_images){
        $content = preg_replace("|url\(([\'\"])\s*https*:.*?([\'\"])\)|si",
                                "url(\\1$secremoveimg\\2)", $content);
    }
    
    /**
     * Fix urls that refer to cid:
     */
    while (preg_match("|url\(([\'\"]\s*cid:.*?[\'\"])\)|si", $content, 
                      $matches)){
        $cidurl = $matches{1};
        $httpurl = sq_cid2http($message, $id, $cidurl);
        $content = preg_replace("|url\($cidurl\)|si",
                                "url($httpurl)", $content);
    }

    /**
     * Fix stupid css declarations which lead to vulnerabilities
     * in IE.
     */
    $match   = Array('/expression/si',
                     '/behaviou*r/si',
                     '/binding/si');
    $replace = Array('idiocy', 'idiocy', 'idiocy');
    $content = preg_replace($match, $replace, $content);
    return $content;
}

/**
 * This function converts cid: url's into the ones that can be viewed in
 * the browser.
 *
 * @param  $message  the message object
 * @param  $id       the message id
 * @param  $cidurl   the cid: url.
 * @return           a string with a http-friendly url
 */
function sq_cid2http($message, $id, $cidurl, $mailbox){
    /**
     * Get rid of quotes.
     */
    $quotchar = substr($cidurl, 0, 1);
    $cidurl = str_replace($quotchar, "", $cidurl);
    $cidurl = substr(trim($cidurl), 4);
    $linkurl = find_ent_id($cidurl, $message);
    /* in case of non-save cid links $httpurl should be replaced by a sort of
       unsave link image */
    $httpurl = '';
    if ($linkurl) {
        $httpurl = $quotchar . '../src/download.php?absolute_dl=true&amp;' .
                   "passed_id=$id&amp;mailbox=" . urlencode($mailbox) .
                   '&amp;ent_id=' . $linkurl . $quotchar;
    }
    return $httpurl;
}

/**
 * This function changes the <body> tag into a <div> tag since we
 * can't really have a body-within-body.
 *
 * @param  $attary  an array of attributes and values of <body>
 * @return          a modified array of attributes to be set for <div>
 */
function sq_body2div($attary){
    $me = 'sq_body2div';
    $divattary = Array('class' => "'bodyclass'");
    $bgcolor = '#ffffff';
    $text = '#000000';
    $styledef = '';
    if (is_array($attary) && sizeof($attary) > 0){
        foreach ($attary as $attname=>$attvalue){
            $quotchar = substr($attvalue, 0, 1);
            $attvalue = str_replace($quotchar, "", $attvalue);
            switch ($attname){
                case 'background':
                    $styledef .= "background-image: url('$attvalue'); ";
                    break;
                case 'bgcolor':
                    $styledef .= "background-color: $attvalue; ";
                    break;
                case 'text':
                    $styledef .= "color: $attvalue; ";
                    break;
            }
        }
        if (strlen($styledef) > 0){
            $divattary{"style"} = "\"$styledef\"";
        }
    }
    return $divattary;
}

/**
 * This is the main function and the one you should actually be calling.
 * There are several variables you should be aware of an which need
 * special description.
 *
 * Since the description is quite lengthy, see it here:
 * http://www.mricon.com/html/phpfilter.html
 *
 * @param $body                 the string with HTML you wish to filter
 * @param $tag_list             see description above
 * @param $rm_tags_with_content see description above
 * @param $self_closing_tags    see description above
 * @param $force_tag_closing    see description above
 * @param $rm_attnames          see description above
 * @param $bad_attvals          see description above
 * @param $add_attr_to_tag      see description above
 * @param $message              message object
 * @param $id                   message id
 * @return                      sanitized html safe to show on your pages.
 */
function sq_sanitize($body, 
                     $tag_list, 
                     $rm_tags_with_content,
                     $self_closing_tags,
                     $force_tag_closing,
                     $rm_attnames,
                     $bad_attvals,
                     $add_attr_to_tag,
                     $message,
                     $id,
                     $mailbox
                     ){
    $me = 'sq_sanitize';
    /**
     * Normalize rm_tags and rm_tags_with_content.
     */
    @array_walk($rm_tags, 'sq_casenormalize');
    @array_walk($rm_tags_with_content, 'sq_casenormalize');
    @array_walk($self_closing_tags, 'sq_casenormalize');
    /**
     * See if tag_list is of tags to remove or tags to allow.
     * false  means remove these tags
     * true   means allow these tags
     */
    $rm_tags = array_shift($tag_list);
    $curpos = 0;
    $open_tags = Array();
    $trusted = "<!-- begin sanitized html -->\n";
    $skip_content = false;
    /**
     * Take care of netscape's stupid javascript entities like
     * &{alert('boo')};
     */
    $body = preg_replace("/&(\{.*?\};)/si", "&amp;\\1", $body);

    while (($curtag=sq_getnxtag($body, $curpos)) != FALSE){
        list($tagname, $attary, $tagtype, $lt, $gt) = $curtag;
        $free_content = substr($body, $curpos, $lt-$curpos);
        /**
         * Take care of <style>
         */
        if ($tagname == "style" && $tagtype == 2){
            /**
             * This is a closing </style>. Edit the
             * content before we apply it.
             */
            $free_content = sq_fixstyle($message, $id, $free_content);
        }
        if ($skip_content == false){
            $trusted .= $free_content;
        }
        if ($tagname != FALSE){
            if ($tagtype == 2){
                if ($skip_content == $tagname){
                    /**
                     * Got to the end of tag we needed to remove.
                     */
                    $tagname = false;
                    $skip_content = false;
                } else {
                    if ($skip_content == false){
                        if ($tagname == "body"){
                            $tagname = "div";
                        } else {
                            if (isset($open_tags{$tagname}) && 
                                $open_tags{$tagname} > 0){
                                $open_tags{$tagname}--;
                            } else {
                                $tagname = false;
                            }
                        }
                    }
                }
            } else {
                /**
                 * $rm_tags_with_content
                 */
                if ($skip_content == false){
                    /**
                     * See if this is a self-closing type and change
                     * tagtype appropriately.
                     */
                    if ($tagtype == 1
                        && in_array($tagname, $self_closing_tags)){
                        $tagtype=3;
                    }
                    /**
                     * See if we should skip this tag and any content
                     * inside it.
                     */
                    if ($tagtype == 1 &&
                        in_array($tagname, $rm_tags_with_content)){
                        $skip_content = $tagname;
                    } else {
                        if (($rm_tags == false 
                             && in_array($tagname, $tag_list)) ||
                            ($rm_tags == true &&
                             !in_array($tagname, $tag_list))){
                            $tagname = false;
                        } else {
                            if ($tagtype == 1){
                                if (isset($open_tags{$tagname})){
                                    $open_tags{$tagname}++;
                                } else {
                                    $open_tags{$tagname}=1;
                                }
                            }
                            /**
                             * This is where we run other checks.
                             */
                            if (is_array($attary) && sizeof($attary) > 0){
                                $attary = sq_fixatts($tagname,
                                                     $attary,
                                                     $rm_attnames,
                                                     $bad_attvals,
                                                     $add_attr_to_tag,
                                                     $message,
                                                     $id,
                                                     $mailbox
                                                     );
                            }
                            /**
                             * Convert body into div.
                             */
                            if ($tagname == "body"){
                                $tagname = "div";
                                $attary = sq_body2div($attary, $message, $id);
                            }
                        }
                    }
                }
            }
            if ($tagname != false && $skip_content == false){
                $trusted .= sq_tagprint($tagname, $attary, $tagtype);
            }
        }
        $curpos = $gt+1;
    }
    $trusted .= substr($body, $curpos, strlen($body)-$curpos);
    if ($force_tag_closing == true){
        foreach ($open_tags as $tagname=>$opentimes){
            while ($opentimes > 0){
                $trusted .= '</' . $tagname . '>';
                $opentimes--;
            }
        }
        $trusted .= "\n";
    }
    $trusted .= "<!-- end sanitized html -->\n";
    return $trusted;
}

/**
 * This is a wrapper function to call html sanitizing routines.
 *
 * @param  $body  the body of the message
 * @param  $id    the id of the message
 * @return        a string with html safe to display in the browser.
 */
function magicHTML($body, $id, $message, $mailbox = 'INBOX'){
    global $attachment_common_show_images, $view_unsafe_images,
           $has_unsafe_images;
    /**
     * Don't display attached images in HTML mode.
     */
    $attachment_common_show_images = false;
    $tag_list = Array(
                      false,
                      "object",
                      "meta",
                      "html",
                      "head",
                      "base",
                      "link",
		      "frame",
		      "iframe"
                      );

    $rm_tags_with_content = Array(
                                  "script",
                                  "applet",
                                  "embed",
                                  "title"
                                  );

    $self_closing_tags =  Array(
                                "img",
                                "br",
                                "hr",
                                "input"
                                );

    $force_tag_closing = false;

    $rm_attnames = Array(
                         "/.*/" =>
                         Array(
                               "/target/si",
                               "/^on.*/si",
                               "/^dynsrc/si",
                               "/^data.*/si"
                               )
                         );

    $secremoveimg = "../images/" . _("sec_remove_eng.png");
    $bad_attvals = Array(
        "/.*/" =>
            Array(
                "/^src|background/i" =>
                    Array(
                          Array(
                                "|^([\'\"])\s*\.\./.*([\'\"])|si",
                                "/^([\'\"])\s*\S+script\s*:.*([\'\"])/si",
                                "/^([\'\"])\s*mocha\s*:*.*([\'\"])/si",
                                "/^([\'\"])\s*about\s*:.*([\'\"])/si"
                                ),
                          Array(
                                "\\1$secremoveimg\\2",
                                "\\1$secremoveimg\\2",
                                "\\1$secremoveimg\\2",
                                "\\1$secremoveimg\\2"
                                )
                        ),
                "/^href|action/i" =>
                    Array(
                          Array(
                                "|^([\'\"])\s*\.\./.*([\'\"])|si",
                                "/^([\'\"])\s*\S+script\s*:.*([\'\"])/si",
                                "/^([\'\"])\s*mocha\s*:*.*([\'\"])/si",
                                "/^([\'\"])\s*about\s*:.*([\'\"])/si"
                                ),
                          Array(
                                "\\1#\\2",
                                "\\1#\\2",
                                "\\1#\\2",
                                "\\1#\\2"
                                )
                        ),
                "/^style/si" =>
                    Array(
                          Array(
                                "/expression/si",
                                "/binding/si",
                                "/behaviou*r/si",
                                "|url\(([\'\"])\s*\.\./.*([\'\"])\)|si",
                                "/url\(([\'\"])\s*\S+script\s*:.*([\'\"])\)/si",
                                "/url\(([\'\"])\s*mocha\s*:.*([\'\"])\)/si",
                                "/url\(([\'\"])\s*about\s*:.*([\'\"])\)/si"
                               ),
                          Array(
                                "idiocy",
                                "idiocy",
                                "idiocy",
                                "url(\\1#\\2)",
                                "url(\\1#\\2)",
                                "url(\\1#\\2)",
                                "url(\\1#\\2)"
                               )
                          )
                )
        );
    if (!$view_unsafe_images){
        /**
         * Remove any references to http/https if view_unsafe_images set
         * to false.
         */
         array_push($bad_attvals{'/.*/'}{'/^src|background/i'}[0],
                    '/^([\'\"])\s*https*:.*([\'\"])/si');
         array_push($bad_attvals{'/.*/'}{'/^src|background/i'}[1],
                    "\\1$secremoveimg\\2");
         array_push($bad_attvals{'/.*/'}{'/^style/si'}[0],
                    '/url\(([\'\"])\s*https*:.*([\'\"])\)/si');
         array_push($bad_attvals{'/.*/'}{'/^style/si'}[1],
                    "url(\\1$secremoveimg\\2)");
    }

    $add_attr_to_tag = Array(
                             "/^a$/si" => Array('target'=>'"_new"')
                             );
    $trusted = sq_sanitize($body, 
                           $tag_list, 
                           $rm_tags_with_content,
                           $self_closing_tags,
                           $force_tag_closing,
                           $rm_attnames,
                           $bad_attvals,
                           $add_attr_to_tag,
                           $message,
                           $id,
                           $mailbox
                           );
    if (preg_match("|$secremoveimg|si", $trusted)){
        $has_unsafe_images = true;
    } 
    return $trusted;
}

?>