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<?php
/**
 * This program is part of Mahara
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 *
 * @package    mahara
 * @subpackage core
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 * @author     Martin Dougiamas <martin@moodle.com>
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 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL
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 * @copyright  (C) 2001-3001 Martin Dougiamas http://dougiamas.com
 * @copyright  additional modifications (c) Catalyst IT Ltd http://catalyst.net.nz
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 *
 */

defined('INTERNAL') || die();

define('BYTESERVING_BOUNDARY', 's1k2o3d4a5k6s7'); //unique string constant

/**
 * @return List of information about file types based on extensions. 
 *   Associative array of extension (lower-case) to associative array
 *   from 'element name' to data. Current element names are 'type' and 'icon'.
 *   Unknown types should use the 'xxx' entry which includes defaults. 
 */
function get_mimetypes_array() {
    return array (
        'xxx'  => array ('type'=>'document/unknown', 'icon'=>'unknown.gif'),
        '3gp'  => array ('type'=>'video/quicktime', 'icon'=>'video.gif'),
        'ai'   => array ('type'=>'application/postscript', 'icon'=>'image.gif'),
        'aif'  => array ('type'=>'audio/x-aiff', 'icon'=>'audio.gif'),
        'aiff' => array ('type'=>'audio/x-aiff', 'icon'=>'audio.gif'),
        'aifc' => array ('type'=>'audio/x-aiff', 'icon'=>'audio.gif'),
        'applescript'  => array ('type'=>'text/plain', 'icon'=>'text.gif'),
        'asc'  => array ('type'=>'text/plain', 'icon'=>'text.gif'),
        'asm'  => array ('type'=>'text/plain', 'icon'=>'text.gif'),
        'au'   => array ('type'=>'audio/au', 'icon'=>'audio.gif'),
        'avi'  => array ('type'=>'video/x-ms-wm', 'icon'=>'avi.gif'),
        'bmp'  => array ('type'=>'image/bmp', 'icon'=>'image.gif'),
        'c'    => array ('type'=>'text/plain', 'icon'=>'text.gif'),
        'cct'  => array ('type'=>'shockwave/director', 'icon'=>'flash.gif'),
        'cpp'  => array ('type'=>'text/plain', 'icon'=>'text.gif'),
        'cs'   => array ('type'=>'application/x-csh', 'icon'=>'text.gif'),
        'css'  => array ('type'=>'text/css', 'icon'=>'text.gif'),
        'dv'   => array ('type'=>'video/x-dv', 'icon'=>'video.gif'),
        'dmg'  => array ('type'=>'application/octet-stream', 'icon'=>'dmg.gif'),
        'doc'  => array ('type'=>'application/msword', 'icon'=>'word.gif'),
        'dcr'  => array ('type'=>'application/x-director', 'icon'=>'flash.gif'),
        'dif'  => array ('type'=>'video/x-dv', 'icon'=>'video.gif'),
        'dir'  => array ('type'=>'application/x-director', 'icon'=>'flash.gif'),
        'dxr'  => array ('type'=>'application/x-director', 'icon'=>'flash.gif'),
        'eps'  => array ('type'=>'application/postscript', 'icon'=>'pdf.gif'),
        'gif'  => array ('type'=>'image/gif', 'icon'=>'image.gif'),
        'gtar' => array ('type'=>'application/x-gtar', 'icon'=>'zip.gif'),
        'tgz'   => array ('type'=>'application/g-zip', 'icon'=>'zip.gif'),
        'gz'   => array ('type'=>'application/g-zip', 'icon'=>'zip.gif'),
        'gzip' => array ('type'=>'application/g-zip', 'icon'=>'zip.gif'),
        'h'    => array ('type'=>'text/plain', 'icon'=>'text.gif'),
        'hpp'  => array ('type'=>'text/plain', 'icon'=>'text.gif'),
        'hqx'  => array ('type'=>'application/mac-binhex40', 'icon'=>'zip.gif'),
        'html' => array ('type'=>'text/html', 'icon'=>'html.gif'),
        'htm'  => array ('type'=>'text/html', 'icon'=>'html.gif'),
        'java' => array ('type'=>'text/plain', 'icon'=>'text.gif'),
        'jcb'  => array ('type'=>'text/xml', 'icon'=>'jcb.gif'),
        'jcl'  => array ('type'=>'text/xml', 'icon'=>'jcl.gif'),
        'jcw'  => array ('type'=>'text/xml', 'icon'=>'jcw.gif'),
        'jmt'  => array ('type'=>'text/xml', 'icon'=>'jmt.gif'),
        'jmx'  => array ('type'=>'text/xml', 'icon'=>'jmx.gif'),
        'jpe'  => array ('type'=>'image/jpeg', 'icon'=>'image.gif'),
        'jpeg' => array ('type'=>'image/jpeg', 'icon'=>'image.gif'),
        'jpg'  => array ('type'=>'image/jpeg', 'icon'=>'image.gif'),
        'jqz'  => array ('type'=>'text/xml', 'icon'=>'jqz.gif'),
        'js'   => array ('type'=>'application/x-javascript', 'icon'=>'text.gif'),
        'latex'=> array ('type'=>'application/x-latex', 'icon'=>'text.gif'),
        'm'    => array ('type'=>'text/plain', 'icon'=>'text.gif'),
        'mov'  => array ('type'=>'video/quicktime', 'icon'=>'video.gif'),
        'movie'=> array ('type'=>'video/x-sgi-movie', 'icon'=>'video.gif'),
        'm3u'  => array ('type'=>'audio/x-mpegurl', 'icon'=>'audio.gif'),
        'mp3'  => array ('type'=>'audio/mp3', 'icon'=>'audio.gif'),
        'mp4'  => array ('type'=>'video/mp4', 'icon'=>'video.gif'),
        'mpeg' => array ('type'=>'video/mpeg', 'icon'=>'video.gif'),
        'mpe'  => array ('type'=>'video/mpeg', 'icon'=>'video.gif'),
        'mpg'  => array ('type'=>'video/mpeg', 'icon'=>'video.gif'),

        'odt'  => array ('type'=>'application/vnd.oasis.opendocument.text', 'icon'=>'odt.gif'),
        'ott'  => array ('type'=>'application/vnd.oasis.opendocument.text-template', 'icon'=>'odt.gif'),
        'oth'  => array ('type'=>'application/vnd.oasis.opendocument.text-web', 'icon'=>'odt.gif'),
        'odm'  => array ('type'=>'application/vnd.oasis.opendocument.text-master', 'icon'=>'odt.gif'),
        'odg'  => array ('type'=>'application/vnd.oasis.opendocument.graphics', 'icon'=>'odt.gif'),
        'otg'  => array ('type'=>'application/vnd.oasis.opendocument.graphics-template', 'icon'=>'odt.gif'),
        'odp'  => array ('type'=>'application/vnd.oasis.opendocument.presentation', 'icon'=>'odt.gif'),
        'otp'  => array ('type'=>'application/vnd.oasis.opendocument.presentation-template', 'icon'=>'odt.gif'),
        'ods'  => array ('type'=>'application/vnd.oasis.opendocument.spreadsheet', 'icon'=>'odt.gif'),
        'ots'  => array ('type'=>'application/vnd.oasis.opendocument.spreadsheet-template', 'icon'=>'odt.gif'),
        'odc'  => array ('type'=>'application/vnd.oasis.opendocument.chart', 'icon'=>'odt.gif'),
        'odf'  => array ('type'=>'application/vnd.oasis.opendocument.formula', 'icon'=>'odt.gif'),
        'odb'  => array ('type'=>'application/vnd.oasis.opendocument.database', 'icon'=>'odt.gif'),
        'odi'  => array ('type'=>'application/vnd.oasis.opendocument.image', 'icon'=>'odt.gif'),

        'pct'  => array ('type'=>'image/pict', 'icon'=>'image.gif'),
        'pdf'  => array ('type'=>'application/pdf', 'icon'=>'pdf.gif'),
        'php'  => array ('type'=>'text/plain', 'icon'=>'text.gif'),
        'pic'  => array ('type'=>'image/pict', 'icon'=>'image.gif'),
        'pict' => array ('type'=>'image/pict', 'icon'=>'image.gif'),
        'png'  => array ('type'=>'image/png', 'icon'=>'image.gif'),
        'pps'  => array ('type'=>'application/vnd.ms-powerpoint', 'icon'=>'powerpoint.gif'),
        'ppt'  => array ('type'=>'application/vnd.ms-powerpoint', 'icon'=>'powerpoint.gif'),
        'ps'   => array ('type'=>'application/postscript', 'icon'=>'pdf.gif'),
        'qt'   => array ('type'=>'video/quicktime', 'icon'=>'video.gif'),
        'ra'   => array ('type'=>'audio/x-realaudio', 'icon'=>'audio.gif'),
        'ram'  => array ('type'=>'audio/x-pn-realaudio', 'icon'=>'audio.gif'),
        'rhb'  => array ('type'=>'text/xml', 'icon'=>'xml.gif'),
        'rm'   => array ('type'=>'audio/x-pn-realaudio', 'icon'=>'audio.gif'),
        'rtf'  => array ('type'=>'text/rtf', 'icon'=>'text.gif'),
        'rtx'  => array ('type'=>'text/richtext', 'icon'=>'text.gif'),
        'sh'   => array ('type'=>'application/x-sh', 'icon'=>'text.gif'),
        'sit'  => array ('type'=>'application/x-stuffit', 'icon'=>'zip.gif'),
        'smi'  => array ('type'=>'application/smil', 'icon'=>'text.gif'),
        'smil' => array ('type'=>'application/smil', 'icon'=>'text.gif'),
        'sqt'  => array ('type'=>'text/xml', 'icon'=>'xml.gif'),
        'svg'  => array ('type'=>'image/svg+xml', 'icon'=>'image.gif'),
        'svgz' => array ('type'=>'image/svg+xml', 'icon'=>'image.gif'),
        'swa'  => array ('type'=>'application/x-director', 'icon'=>'flash.gif'),
        'swf'  => array ('type'=>'application/x-shockwave-flash', 'icon'=>'flash.gif'),
        'swfl' => array ('type'=>'application/x-shockwave-flash', 'icon'=>'flash.gif'),

        'sxw'  => array ('type'=>'application/vnd.sun.xml.writer', 'icon'=>'odt.gif'),
        'stw'  => array ('type'=>'application/vnd.sun.xml.writer.template', 'icon'=>'odt.gif'),
        'sxc'  => array ('type'=>'application/vnd.sun.xml.calc', 'icon'=>'odt.gif'),
        'stc'  => array ('type'=>'application/vnd.sun.xml.calc.template', 'icon'=>'odt.gif'),
        'sxd'  => array ('type'=>'application/vnd.sun.xml.draw', 'icon'=>'odt.gif'),
        'std'  => array ('type'=>'application/vnd.sun.xml.draw.template', 'icon'=>'odt.gif'),
        'sxi'  => array ('type'=>'application/vnd.sun.xml.impress', 'icon'=>'odt.gif'),
        'sti'  => array ('type'=>'application/vnd.sun.xml.impress.template', 'icon'=>'odt.gif'),
        'sxg'  => array ('type'=>'application/vnd.sun.xml.writer.global', 'icon'=>'odt.gif'),
        'sxm'  => array ('type'=>'application/vnd.sun.xml.math', 'icon'=>'odt.gif'),

        'tar'  => array ('type'=>'application/x-tar', 'icon'=>'zip.gif'),
        'tif'  => array ('type'=>'image/tiff', 'icon'=>'image.gif'),
        'tiff' => array ('type'=>'image/tiff', 'icon'=>'image.gif'),
        'tex'  => array ('type'=>'application/x-tex', 'icon'=>'text.gif'),
        'texi' => array ('type'=>'application/x-texinfo', 'icon'=>'text.gif'),
        'texinfo'  => array ('type'=>'application/x-texinfo', 'icon'=>'text.gif'),
        'tsv'  => array ('type'=>'text/tab-separated-values', 'icon'=>'text.gif'),
        'txt'  => array ('type'=>'text/plain', 'icon'=>'text.gif'),
        'wav'  => array ('type'=>'audio/wav', 'icon'=>'audio.gif'),
        'wmv'  => array ('type'=>'video/x-ms-wmv', 'icon'=>'avi.gif'),
        'asf'  => array ('type'=>'video/x-ms-asf', 'icon'=>'avi.gif'),
        'xls'  => array ('type'=>'application/vnd.ms-excel', 'icon'=>'excel.gif'),
        'xml'  => array ('type'=>'application/xml', 'icon'=>'xml.gif'),
        'xsl'  => array ('type'=>'text/xml', 'icon'=>'xml.gif'),
        'zip'  => array ('type'=>'application/zip', 'icon'=>'zip.gif')
    );
}

/** 
 * Obtains information about a filetype based on its extension. Will
 * use a default if no information is present about that particular
 * extension.
 * @param string $element Desired information (usually 'icon' 
 *   for icon filename or 'type' for MIME type)
 * @param string $filename Filename we're looking up  
 * @return string Requested piece of information from array
 */
function mimeinfo($element, $filename) {
    static $mimeinfo;
    $mimeinfo=get_mimetypes_array();

    if (eregi('\.([a-z0-9]+)$', $filename, $match)) {
        if (isset($mimeinfo[strtolower($match[1])][$element])) {
            return $mimeinfo[strtolower($match[1])][$element];
        } else {
            return $mimeinfo['xxx'][$element];   // By default
        }
    } else {
        return $mimeinfo['xxx'][$element];   // By default
    }
}

/** 
 * Obtains information about a filetype based on the MIME type rather than
 * the other way around.
 * @param string $element Desired information (usually 'icon')
 * @param string $mimetype MIME type we're looking up  
 * @return string Requested piece of information from array
 */
function mimeinfo_from_type($element, $mimetype) {
    static $mimeinfo;
    $mimeinfo=get_mimetypes_array();
    
    foreach($mimeinfo as $values) {
        if($values['type']==$mimetype) {
            if(isset($values[$element])) {
                return $values[$element];
            }
            break;
        }
    }
    return $mimeinfo['xxx'][$element]; // Default
}

/**
 * Obtains descriptions for file types (e.g. 'Microsoft Word document') from the 
 * mimetypes.php language file. 
 * @param string $mimetype MIME type (can be obtained using the mimeinfo function)
 * @param bool $capitalise If true, capitalises first character of result
 * @return string Text description 
 */
function get_mimetype_description($mimetype,$capitalise=false) {
    $result=get_string($mimetype,'mimetypes');
    // Surrounded by square brackets indicates that there isn't a string for that
    // (maybe there is a better way to find this out?)
    if(strpos($result,'[')===0) {
        $result=get_string('document/unknown','mimetypes');
    } 
    if($capitalise) {
        $result=ucfirst($result);
    }
    return $result;
}

/** 
 * Handles the sending of file data to the user's browser, including support for 
 * byteranges etc. 
 * @param string $path Path of file on disk (including real filename), or actual content of file as string
 * @param string $filename Filename to send
 * @param int $lifetime Number of seconds before the file should expire from caches (default 24 hours)
 * @param bool $pathisstring If true (default false), $path is the content to send and not the pathname
 * @param bool $forcedownload If true (default false), forces download of file rather than view in browser/plugin
 * @param string $mimetype Include to specify the MIME type; leave blank to have it guess the type from $filename
 */
function send_file($path, $filename, $lifetime=86400 , $pathisstring=false, $forcedownload=true, $mimetype='') {

    // Stuff from moodle $CFG; need to work out what to do about it.
    $disablebyteserving = false;
    $wwwroot = get_config('wwwroot');
    $usesid = false;
    $sessioncookie = '';

    // Use given MIME type if specified, otherwise guess it using
    // mimeinfo.  IE, Konqueror and Opera open html file directly in
    // browser from web even when directed to save it to disk :-O only
    // Firefox saves all files locally before opening when
    // content-disposition: attachment stated

    // Mahara has no check_browser_version function
    // Just ignore this for now.
    //$isFF         = check_browser_version('Firefox', '1.5'); // only FF > 1.5 properly tested
    $isFF = false;

    $mimetype     = ($forcedownload and !$isFF) ? 'application/x-forcedownload' : 
                         ($mimetype ? $mimetype : mimeinfo('type', $filename));
    $lastmodified = $pathisstring ? time() : filemtime($path);
    $filesize     = $pathisstring ? strlen($path) : filesize($path);

    //IE compatibiltiy HACK!
    if (ini_get('zlib.output_compression')) {
        ini_set('zlib.output_compression', 'Off');
    }

    //try to disable automatic sid rewrite in cookieless mode
    @ini_set("session.use_trans_sid", "false");

    //do not put '@' before the next header to detect incorrect moodle configurations,
    //error should be better than "weird" empty lines for admins/users
    //TODO: should we remove all those @ before the header()? Are all of the values supported on all servers?
    header('Last-Modified: '. gmdate('D, d M Y H:i:s', $lastmodified) .' GMT');

    if ($forcedownload) {
        @header('Content-Disposition: attachment; filename='.$filename);
    } else {
        @header('Content-Disposition: inline; filename='.$filename);
    }

    if ($lifetime > 0) {
        @header('Cache-Control: max-age='.$lifetime);
        @header('Expires: '. gmdate('D, d M Y H:i:s', time() + $lifetime) .' GMT');
        @header('Pragma: ');

        if (empty($disablebyteserving) && !$pathisstring && $mimetype != 'text/plain' && $mimetype != 'text/html') {

            @header('Accept-Ranges: bytes');

            if (!empty($_SERVER['HTTP_RANGE']) && strpos($_SERVER['HTTP_RANGE'],'bytes=') !== FALSE) {
                // byteserving stuff - for acrobat reader and download accelerators
                // see: http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.35
                // inspired by: http://www.coneural.org/florian/papers/04_byteserving.php
                $ranges = false;
                if (preg_match_all('/(\d*)-(\d*)/', $_SERVER['HTTP_RANGE'], $ranges, PREG_SET_ORDER)) {
                    foreach ($ranges as $key=>$value) {
                        if ($ranges[$key][1] == '') {
                            //suffix case
                            $ranges[$key][1] = $filesize - $ranges[$key][2];
                            $ranges[$key][2] = $filesize - 1;
                        } else if ($ranges[$key][2] == '' || $ranges[$key][2] > $filesize - 1) {
                            //fix range length
                            $ranges[$key][2] = $filesize - 1;
                        }
                        if ($ranges[$key][2] != '' && $ranges[$key][2] < $ranges[$key][1]) {
                            //invalid byte-range ==> ignore header
                            $ranges = false;
                            break;
                        }
                        //prepare multipart header
                        $ranges[$key][0] =  "\r\n--".BYTESERVING_BOUNDARY."\r\nContent-Type: $mimetype\r\n";
                        $ranges[$key][0] .= "Content-Range: bytes {$ranges[$key][1]}-{$ranges[$key][2]}/$filesize\r\n\r\n";
                    }
                } else {
                    $ranges = false;
                }
                if ($ranges) {
                    byteserving_send_file($path, $mimetype, $ranges);
                }
            }
        } else {
            /// Do not byteserve (disabled, strings, text and html files).
            @header('Accept-Ranges: none');
        }
    } else { // Do not cache files in proxies and browsers
        if (strpos($wwwroot, 'https://') === 0) { //https sites - watch out for IE! KB812935 and KB316431
            @header('Cache-Control: max-age=10');
            @header('Expires: '. gmdate('D, d M Y H:i:s', 0) .' GMT');
            @header('Pragma: ');
        } else { //normal http - prevent caching at all cost
            @header('Cache-Control: private, must-revalidate, pre-check=0, post-check=0, max-age=0');
            @header('Expires: '. gmdate('D, d M Y H:i:s', 0) .' GMT');
            @header('Pragma: no-cache');
        }
        @header('Accept-Ranges: none'); // Do not allow byteserving when caching disabled
    }

    if ($mimetype == 'text/html' && !empty($usesid) && empty($_COOKIE['MoodleSession'.$sessioncookie])) {
        //cookieless mode - rewrite links
        @header('Content-Type: text/html');
        $path = $pathisstring ? $path : implode('', file($path));
        $path = sid_ob_rewrite($path);
        $filesize = strlen($path);
        $pathisstring = true;
    } else if ($mimetype == 'text/plain') {
        @header('Content-Type: Text/plain; charset=utf-8'); //add encoding
    } else {
        @header('Content-Type: '.$mimetype);
    }
    @header('Content-Length: '.$filesize);
    while (@ob_end_flush()); //flush the buffers - save memory and disable sid rewrite
    if ($pathisstring) {
        echo $path;
    } else {
        readfile_chunked($path);
    }

    die; //no more chars to output!!!
}

/**
 * Recursively delete the file or folder with path $location. That is, 
 * if it is a file delete it. If it is a folder, delete all its content
 * then delete it. If $location does not exist to start, that is not 
 * considered an error. 
 * 
 * @param $location the path to remove.
 */
function fulldelete($location) {
    if (is_dir($location)) {
        $currdir = opendir($location);
        while (false !== ($file = readdir($currdir))) {
            if ($file <> ".." && $file <> ".") {
                $fullfile = $location."/".$file;
                if (is_dir($fullfile)) {
                    if (!fulldelete($fullfile)) {
                        return false;
                    }
                } else {
                    if (!unlink($fullfile)) {
                        return false;
                    }
                }
            }
        }
        closedir($currdir);
        if (! rmdir($location)) {
            return false;
        }

    } else if (file_exists($location)) {
        if (!unlink($location)) {
            return false;
        }
    }
    return true;
}

/**
 * Improves memory consumptions and works around buggy readfile() in PHP 5.0.4 (2MB readfile limit).
 */
function readfile_chunked($filename, $retbytes=true) {
    $chunksize = 1*(1024*1024); // 1MB chunks - must be less than 2MB!
    $buffer = '';
    $cnt =0;// $handle = fopen($filename, 'rb');
    $handle = fopen($filename, 'rb');
    if ($handle === false) {
        return false;
    }

    while (!feof($handle)) {
        @set_time_limit(60*60); //reset time limit to 60 min - should be enough for 1 MB chunk
        $buffer = fread($handle, $chunksize);
        echo $buffer;
        flush();
        if ($retbytes) {
            $cnt += strlen($buffer);
        }
    }
    $status = fclose($handle);
    if ($retbytes && $status) {
        return $cnt; // return num. bytes delivered like readfile() does.
    }
    return $status;
}

/**
 * Send requested byterange of file.
 */
function byteserving_send_file($filename, $mimetype, $ranges) {
    $chunksize = 1*(1024*1024); // 1MB chunks - must be less than 2MB!
    $handle = fopen($filename, 'rb');
    if ($handle === false) {
        die;
    }
    if (count($ranges) == 1) { //only one range requested
        $length = $ranges[0][2] - $ranges[0][1] + 1;
        @header('HTTP/1.1 206 Partial content');
        @header('Content-Length: '.$length);
        @header('Content-Range: bytes '.$ranges[0][1].'-'.$ranges[0][2].'/'.filesize($filename));
        @header('Content-Type: '.$mimetype);
        while (@ob_end_flush()); //flush the buffers - save memory and disable sid rewrite
        $buffer = '';
        fseek($handle, $ranges[0][1]);
        while (!feof($handle) && $length > 0) {
            @set_time_limit(60*60); //reset time limit to 60 min - should be enough for 1 MB chunk
            $buffer = fread($handle, ($chunksize < $length ? $chunksize : $length));
            echo $buffer;
            flush();
            $length -= strlen($buffer);
        }
        fclose($handle);
        die;
    } else { // multiple ranges requested - not tested much
        $totallength = 0;
        foreach($ranges as $range) {
            $totallength += strlen($range[0]) + $range[2] - $range[1] + 1;
        }
        $totallength += strlen("\r\n--".BYTESERVING_BOUNDARY."--\r\n");
        @header('HTTP/1.1 206 Partial content');
        @header('Content-Length: '.$totallength);
        @header('Content-Type: multipart/byteranges; boundary='.BYTESERVING_BOUNDARY);
        //TODO: check if "multipart/x-byteranges" is more compatible with current readers/browsers/servers
        while (@ob_end_flush()); //flush the buffers - save memory and disable sid rewrite
        foreach($ranges as $range) {
            $length = $range[2] - $range[1] + 1;
            echo $range[0];
            $buffer = '';
            fseek($handle, $range[1]);
            while (!feof($handle) && $length > 0) {
                @set_time_limit(60*60); //reset time limit to 60 min - should be enough for 1 MB chunk
                $buffer = fread($handle, ($chunksize < $length ? $chunksize : $length));
                echo $buffer;
                flush();
                $length -= strlen($buffer);
            }
        }
        echo "\r\n--".BYTESERVING_BOUNDARY."--\r\n";
        fclose($handle);
        die;
    }
}

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function get_mime_type($file) {
    switch (strtolower(PHP_OS)) {
    case 'win' :
        throw new SystemException('retrieving filetype not supported in windows');
    default : 
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        list($output,) = split(';', exec(get_config('pathtofile') . ' -ib ' . escapeshellarg($file)));
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    }
    return $output;

}


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function is_image_mime_type($type) {
    return in_array($type, array('image/jpeg', 'image/jpg', 'image/gif', 'image/png'));
}


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/**
 * Given a path under dataroot, an ID and a size, return the path to a file
 * matching all criteria.
 *
 * If the file with the ID exists but not of the correct size, this function
 * will make a copy that is resized to the correct size.
 */
function get_dataroot_image_path($path, $id, $size) {
    $dataroot = get_config('dataroot');
    $imagepath = $dataroot . $path;

    if (!is_dir($imagepath) || !is_readable($imagepath)) {
        return false;
    }
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    //$imagepath .= "/$id";
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    if ($size && !preg_match('/\d+x\d+/', $size)) {
        throw new UserException('Invalid size for image specified');
    }

    // If the image is already available, return the path to it
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    $path = $imagepath . '/' . ($size ? "$size/" : '') . ($id % 256) . "/$id";
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    if (is_readable($path)) {
        return $path;
    }
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    if ($size) {
        // Image is not available in this size. If there is a base image for
        // it, we can make one however.
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        $originalimage = $imagepath . '/' . ($id % 256) . "/$id";
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        if (is_readable($originalimage)) {
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            list($width, $height) = explode('x', $size);

            switch (get_mime_type($originalimage)) {
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                case 'image/jpeg':
                    $oldih = imagecreatefromjpeg($originalimage);
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                    break;
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                case 'image/png':
                    $oldih = imagecreatefrompng($originalimage);
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                    break;
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                case 'image/gif':
                    $oldih = imagecreatefromgif($originalimage);
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                    break;
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                default:
                    return false;
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            }

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            if (!$oldih) {
                return false;
            }
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            $oldx = imagesx($oldih);
            $oldy = imagesy($oldih);
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            if ($oldy > $oldx) {
                $newy = $height;
                $newx = ($oldx * $newy) / $oldy;
            }
            else {
                $newx = $width;
                $newy = ($oldx * $newx) / $oldx;
            }
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            $newih = imagecreatetruecolor($newx, $newy);
            imagecopyresized($newih, $oldih, 0, 0, 0, 0, $newx, $newy, $oldx, $oldy);
            imageinterlace($newih);
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            $newpath = $imagepath . "/$size/" . ($id % 256);
            check_dir_exists($newpath);
            $newpath .= "/$id";
            $result = imagepng($newih, $newpath);
            return $newpath;
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        }
    }

    // Image not available in any size
    return false;
}
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?>