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PHP ZIP file upload

Here is the code that downloads the attachment files from the imap server. Almost all file types (pdf, doc, xls, etc.) are loaded correctly, where, like some zip files, it produces the following error:

"The archive is in an unknown format or damaged"

the code:

//data from imap server
$name = "xyz 123.zip";
$type = "APPLICATION";
$subtype = "ZIP";
$encoding = "BASE64";
$body = imap_base64($data);

header('Content-Description: File Transfer');
header('Content-Type: '. $type .'/'. $subtype);
header('Content-Disposition: attachment; filename='.$name);
header('Content-Transfer-Encoding: '.$encoding);
header('Expires: 0');
header('Cache-Control: must-revalidate');
header('Pragma: public');
ob_clean();
flush();
echo $body;

Also, if I repeat the data and convert it to a file using:

http://www.motobit.com/util/base64-decoder-encoder.asp

The file is loading correctly. Therefore, there is no problem getting the file from the server. Where am I going wrong?

+3
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7 answers

Script to download zip files: zip.php

<?php

/**
* Zip file creation class.
* Makes zip files.
*
* Last Modification and Extension By :
*
*  Hasin Hayder
*  HomePage : www.hasinme.info
*  Email : countdraculla@gmail.com
*  IDE : PHP Designer 2005
*
*
* Originally Based on :
*
*  http://www.zend.com/codex.php?id=535&single=1
*  By Eric Mueller <eric@themepark.com>
*
*  http://www.zend.com/codex.php?id=470&single=1
*  by Denis125 <webmaster@atlant.ru>
*
*  a patch from Peter Listiak <mlady@users.sourceforge.net> for last modified
*  date and time of the compressed file
*
* Official ZIP file format: http://www.pkware.com/appnote.txt
*
* @access  public
*/
class zipfile
{
    /**
     * Array to store compressed data
     *
     * @var  array    $datasec
     */
    var $datasec      = array();

    /**
     * Central directory
     *
     * @var  array    $ctrl_dir
     */
    var $ctrl_dir     = array();

    /**
     * End of central directory record
     *
     * @var  string   $eof_ctrl_dir
     */
    var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00";

    /**
     * Last offset position
     *
     * @var  integer  $old_offset
     */
    var $old_offset   = 0;


    /**
     * Converts an Unix timestamp to a four byte DOS date and time format (date
     * in high two bytes, time in low two bytes allowing magnitude comparison).
     *
     * @param  integer  the current Unix timestamp
     *
     * @return integer  the current date in a four byte DOS format
     *
     * @access private
     */
    function unix2DosTime($unixtime = 0) {
        $timearray = ($unixtime == 0) ? getdate() : getdate($unixtime);

        if ($timearray['year'] < 1980) {
            $timearray['year']    = 1980;
            $timearray['mon']     = 1;
            $timearray['mday']    = 1;
            $timearray['hours']   = 0;
            $timearray['minutes'] = 0;
            $timearray['seconds'] = 0;
        } // end if

        return (($timearray['year'] - 1980) << 25) | ($timearray['mon'] << 21) | ($timearray['mday'] << 16) |
                ($timearray['hours'] << 11) | ($timearray['minutes'] << 5) | ($timearray['seconds'] >> 1);
    } // end of the 'unix2DosTime()' method

    /**
     *
     * Function to force the download of the archive as soon as it is created
     *
     * @param archiveName string - name of the created archive file
     * @access public
     * @return ZipFile via Header
     */
    public function forceDownload($archiveName) {
        if(ini_get('zlib.output_compression')) {
            ini_set('zlib.output_compression', 'Off');
        }

        // Security checks
        if( $archiveName == "" ) {
            echo "<html><title>Public Photo Directory - Download </title><body><BR><B>ERROR:</B> The download file was NOT SPECIFIED.</body></html>";
            exit;
        }
        elseif ( ! file_exists( $archiveName ) ) {
            echo "<html><title>Public Photo Directory - Download </title><body><BR><B>ERROR:</B> File not found.</body></html>";
            exit;
        }

        header("Pragma: public");
        header("Expires: 0");
        header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
        header("Cache-Control: private",false);
        header("Content-Type: application/zip");
        header("Content-Disposition: attachment; filename=".basename($archiveName).";" );
        header("Content-Transfer-Encoding: binary");
        header("Content-Length: ".filesize($archiveName));
        readfile("$archiveName");
    }

    /**
     * Adds "file" to archive
     *
     * @param  string   file contents
     * @param  string   name of the file in the archive (may contains the path)
     * @param  integer  the current timestamp
     *
     * @access public
     */
    function addFile($data, $name, $time = 0)
    {
        $name     = str_replace('\\', '/', $name);

        $dtime    = dechex($this->unix2DosTime($time));
        $hexdtime = '\x' . $dtime[6] . $dtime[7]
                  . '\x' . $dtime[4] . $dtime[5]
                  . '\x' . $dtime[2] . $dtime[3]
                  . '\x' . $dtime[0] . $dtime[1];
        eval('$hexdtime = "' . $hexdtime . '";');

        $fr   = "\x50\x4b\x03\x04";
        $fr   .= "\x14\x00";            // ver needed to extract
        $fr   .= "\x00\x00";            // gen purpose bit flag
        $fr   .= "\x08\x00";            // compression method
        $fr   .= $hexdtime;             // last mod time and date

        // "local file header" segment
        $unc_len = strlen($data);
        $crc     = crc32($data);
        $zdata   = gzcompress($data);
        $zdata   = substr(substr($zdata, 0, strlen($zdata) - 4), 2); // fix crc bug
        $c_len   = strlen($zdata);
        $fr      .= pack('V', $crc);             // crc32
        $fr      .= pack('V', $c_len);           // compressed filesize
        $fr      .= pack('V', $unc_len);         // uncompressed filesize
        $fr      .= pack('v', strlen($name));    // length of filename
        $fr      .= pack('v', 0);                // extra field length
        $fr      .= $name;

        // "file data" segment
        $fr .= $zdata;

        // "data descriptor" segment (optional but necessary if archive is not
        // served as file)
        $fr .= pack('V', $crc);                 // crc32
        $fr .= pack('V', $c_len);               // compressed filesize
        $fr .= pack('V', $unc_len);             // uncompressed filesize

        // add this entry to array
        $this -> datasec[] = $fr;

        // now add to central directory record
        $cdrec = "\x50\x4b\x01\x02";
        $cdrec .= "\x00\x00";                // version made by
        $cdrec .= "\x14\x00";                // version needed to extract
        $cdrec .= "\x00\x00";                // gen purpose bit flag
        $cdrec .= "\x08\x00";                // compression method
        $cdrec .= $hexdtime;                 // last mod time & date
        $cdrec .= pack('V', $crc);           // crc32
        $cdrec .= pack('V', $c_len);         // compressed filesize
        $cdrec .= pack('V', $unc_len);       // uncompressed filesize
        $cdrec .= pack('v', strlen($name) ); // length of filename
        $cdrec .= pack('v', 0 );             // extra field length
        $cdrec .= pack('v', 0 );             // file comment length
        $cdrec .= pack('v', 0 );             // disk number start
        $cdrec .= pack('v', 0 );             // internal file attributes
        $cdrec .= pack('V', 32 );            // external file attributes - 'archive' bit set

        $cdrec .= pack('V', $this -> old_offset ); // relative offset of local header
        $this -> old_offset += strlen($fr);

        $cdrec .= $name;

        // optional extra field, file comment goes here
        // save to central directory
        $this -> ctrl_dir[] = $cdrec;
    } // end of the 'addFile()' method


    /**
     * Dumps out file
     *
     * @return  string  the zipped file
     *
     * @access public
     */
    function file()
    {
        $data    = implode('', $this -> datasec);
        $ctrldir = implode('', $this -> ctrl_dir);

        return
            $data .
            $ctrldir .
            $this -> eof_ctrl_dir .
            pack('v', sizeof($this -> ctrl_dir)) .  // total # of entries "on this disk"
            pack('v', sizeof($this -> ctrl_dir)) .  // total # of entries overall
            pack('V', strlen($ctrldir)) .           // size of central dir
            pack('V', strlen($data)) .              // offset to start of central dir
            "\x00\x00";                             // .zip file comment length
    } // end of the 'file()' method


    /**
     * A Wrapper of original addFile Function
     *
     * Created By Hasin Hayder at 29th Jan, 1:29 AM
     *
     * @param array An Array of files with relative/absolute path to be added in Zip File
     *
     * @access public
     */
    function addFiles($files /*Only Pass Array*/)
    {
        foreach($files as $file)
        {
        if (is_file($file)) //directory check
        {
            $data = implode("",file($file));
                    $new_file = $this->prefix_name.end(explode('/', $file));
                    $this->addFile($data, $new_file);
                }
        }
    }

    /**
     * A Wrapper of original file Function
     *
     * Created By Hasin Hayder at 29th Jan, 1:29 AM
     *
     * @param string Output file name
     *
     * @access public
     */
    function output($file)
    {
        $fp=fopen($file,"w");
        fwrite($fp,$this->file());
        fclose($fp);
    }



} // end of the 'zipfile' class
?>

Using an example:

<?php

include_once('zip.php');

$zip_file = 'my_files.zip'; // name for downloaded zip file

$ziper = new zipfile();
$ziper->prefix_name = 'folder/'; // here you create folder which will contain downloaded files
$ziper->addFiles($files_to_zip);  // array of files
$ziper->output($zip_file); 
$ziper->forceDownload($zip_file);
@unlink($zip_file);

?>
+5
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, , , .

while (ob_get_level()) {
  ob_end_clean();
}
+1

imap_base64. . base64_decode .

$body = base64_encode($data);
0

! , Content-type , .zip . Content-Type, .

// Remove this line 
header('Content-Type: '. $type .'/'. $subtype);

(Chrome) :

, , MIME-/ :

, MIME-/zip:

MIME- ( Content-type),.zip .

script .zip : (: ..)

<?php
    header("Content-Disposition: attachment; filename=\"".$Filename."\"");
    header("Content-Length: ".filesize($Filename));
    readfile($Filename);
?>

Edited

.zip , . readfile(), exit(); , . ( ). : , , HTML, . .

0
It Worked For Me. It Download My .Zip File. But, you have to provide the full path of File, where it is located.
For ex: My File is inside assets/upload Folder. Attach name of that file with this location. You will download it without any problem.

$FilePaths='assets/Upload/'.$FileName; //Give proper file path with file name.

download_file($FilePaths);

function download_file( $fullPath )
{
  if( headers_sent() )
    die('Headers Sent');


  if(ini_get('zlib.output_compression'))
    ini_set('zlib.output_compression', 'Off');


  if( file_exists($fullPath) )
  {

    $fsize = filesize($fullPath);
    $path_parts = pathinfo($fullPath);
    $ext = strtolower($path_parts["extension"]);

    switch ($ext) 
    {
      case "pdf": $ctype="application/pdf"; break;
      case "exe": $ctype="application/octet-stream"; break;
      case "zip": $ctype="application/zip"; break;
      case "doc": $ctype="application/msword"; break;
      case "xls": $ctype="application/vnd.ms-excel"; break;
      case "ppt": $ctype="application/vnd.ms-powerpoint"; break;
      case "gif": $ctype="image/gif"; break;
      case "png": $ctype="image/png"; break;
      case "jpeg":
      case "jpg": $ctype="image/jpg"; break;
      default: $ctype="application/force-download";
    }

    header("Pragma: public"); 
    header("Expires: 0");
    header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
    header("Cache-Control: private",false); 
    header("Content-Type: $ctype");
    header("Content-Disposition: attachment; filename=\"".basename($fullPath)."\";" );
    header("Content-Transfer-Encoding: binary");
    header("Content-Length: ".$fsize);
    ob_clean();
    flush();
    readfile( $fullPath );

  } 
  else
    die('File Not Found');

}

,

0

I did not see anyone mention this, but try removing the Content-Length header when downloading ZIP files. I had the same problem and it worked for

0
source

This is really good for downloading a large file. The user will receive the file immediately. Perhaps zip will also be correct.

    if(file_exists($filename) && is_readable($filename) && file_exists($filename)){
             header("Content-Disposition: attachment; filename=".basename(str_replace(' ', '_', $filename)));
             header("Content-Type: application/force-download");
             header("Content-Type: application/octet-stream");
             header("Content-Type: application/download");
             header("Content-Description: File Transfer");
             header("Content-Length: " . filesize($filename));
             flush(); // this doesn't really matter.

             $fp = fopen($filename, "r");
             while (!feof($fp))
             {
                 echo fread($fp, 65536);
                 flush(); // this is essential for large downloads
             }
             fclose($fp);
         exit;
    }
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