How to allow downloaded files to be splitted when using a force-download script ?

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  • Bouffa

    How to allow downloaded files to be splitted when using a force-download script ?

    Hello everyone,

    I suppose you all know force-download scripts. The problem is that
    these scripts don't allow files to be splitted when downloading them
    via a download manager.
    I've found a solution to enable download resuming, but now, it remains
    the splitting problem. Does anyone have any idea ?

  • the DtTvB

    #2
    Re: How to allow downloaded files to be splitted when using a force-download script ?

    For apache servers, use
    implode('::', apache_request_ headers());
    It will get each request headers from apache.

    Download managers will send this request:
    Range: bytes=xxxxx-yyyyy
    Where xxxxx is the start position, and yyyyy is the end position.

    Some download managers will send this request:
    Range: bytes=xxxxx-
    This means start position is xxxxx and so on.

    If it has no matches, send it all.

    If the match was found, send this header.
    header('HTTP/1.1 206 Partial content');
    else send this.
    header('HTTP/1.1 200 OK');

    Use substr to split the file content and send
    header('Content-Length: ' . strlen($content ));
    // The substred content.

    Hope this helps.

    Comment

    • John Dunlop

      #3
      Re: How to allow downloaded files to be splitted when using a force-download script ?

      Bouffa:
      [color=blue]
      > I suppose you all know force-download scripts.[/color]

      I don't believe I do. I don't believe there's any such things. Yes,
      there's things that might be called force-download scripts, but that
      doesn't really make them scripts that force downloads, does it?

      The success, if you can call it that, of the kind of script I think
      you're talking about rests on a set of ifs: if the user-agent is
      configured this way, then... if the user-agent is configured that way,
      then... There's too many conditions to be met for me to be comfortable
      with 'force'.

      Also, alarm bells should ring when you see that such scripts are most
      sucessful if they misrepresent the data, by which I mean having
      Content-Types that don't tell the MIME type.

      --
      Jock

      Comment

      • Bouffa

        #4
        Re: How to allow downloaded files to be splitted when using a force-download script ?

        the DtTvB[color=blue]
        >Hope this helps.[/color]

        I'm afraid no :(

        The apache server (1.33) of my hoster doesn't recognize neigther
        apache_request_ headers nor getallheaders function !

        So I tried to use the $_ENV['HTTP_RANGE'] to read the header sent by
        the download manager. I put some lines to store the headers. The first
        time the file is downloaded, there is no header http_range recieved by
        the script, so no splitted parts. When I pause then resume the
        download, the header Range: bytes=xxxxx- is sent, so the script sends
        the rest of the file.
        Here is my code :

        <?php
        $filename=basen ame($file_to_do wnload);
        $file_extension = strtolower(subs tr(strrchr($fil ename,"."),1));
        switch( $file_extension ) {
        case "mp3": $ctype="audio/mpeg"; break;
        case "mpg":$ctype="v ideo/mpeg"; break;
        case "avi": $ctype="video/x-msvideo"; break;
        case "wmv": $ctype="video/x-ms-wmv";break;
        case "wma": $ctype="audio/x-ms-wma";break;
        default: $ctype="applica tion/force-download";
        }

        //Begin writing eaders
        header("Pragma: public");
        header("Expires : 0");
        header("Cache-Control:");
        header("Cache-Control: public");
        header("Content-Description: File Transfer");
        //Use the switch-generated Content-Type
        header("Content-Type: $ctype");
        $header='Conten t-Disposition: attachment; filename="'.$fi lename.'";';
        header($header );
        header("Content-Transfer-Encoding: binary");
        $size=filesize( $file_to_downlo ad);
        //check if http_range is sent by browser (or download manager)
        if(isset($_ENV['HTTP_RANGE'])) {
        list($a, $range)=explode ("=",$_ENV['HTTP_RANGE']);
        //if yes, download missing part
        str_replace($ra nge, "-", $range);
        $size2=$size-1;
        header("Content-Range: $range$size2/$size");
        $new_length=$si ze2-$range;
        header("Content-Length: $new_length");
        //if not, download whole file
        } else {
        $size2=$size-1;
        header("Content-Range: bytes 0-$size2/$size");
        header("Content-Length: ".$size2);
        }
        //open the file
        $fp=fopen("$_fi le","r");
        //seek to start of missing part
        fseek($fp,$rang e);
        //start buffered download
        while(!feof($fp )){
        //reset time limit for big files
        set_time_limit( );
        print(fread($fp ,1024*8));
        flush();
        }
        fclose($fp);
        exit;

        Comment

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