libraries/zip.lib.php

   1 <?php
   2 /* vim: set expandtab sw=4 ts=4 sts=4: */
   3 /**
   4  *
   5  * @package phpMyAdmin
   6  */
   7
   8 /**
   9  * Zip file creation class.
  10  * Makes zip files.
  11  *
  12  * Based on :
  13  *
  14  *  http://www.zend.com/codex.php?id=535&single=1
  15  *  By Eric Mueller <eric@themepark.com>
  16  *
  17  *  http://www.zend.com/codex.php?id=470&single=1
  18  *  by Denis125 <webmaster@atlant.ru>
  19  *
  20  *  a patch from Peter Listiak <mlady@users.sourceforge.net> for last modified
  21  *  date and time of the compressed file
  22  *
  23  * Official ZIP file format: http://www.pkware.com/appnote.txt
  24  *
  25  * @access  public
  26  * @package phpMyAdmin
  27  */
  28 class zipfile
  29 {
  30     /**
  31      * Array to store compressed data
  32      *
  33      * @var  array    $datasec
  34      */
  35     var $datasec      = array();
  36
  37     /**
  38      * Central directory
  39      *
  40      * @var  array    $ctrl_dir
  41      */
  42     var $ctrl_dir     = array();
  43
  44     /**
  45      * End of central directory record
  46      *
  47      * @var  string   $eof_ctrl_dir
  48      */
  49     var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00";
  50
  51     /**
  52      * Last offset position
  53      *
  54      * @var  integer  $old_offset
  55      */
  56     var $old_offset   = 0;
  57
  58
  59     /**
  60      * Converts an Unix timestamp to a four byte DOS date and time format (date
  61      * in high two bytes, time in low two bytes allowing magnitude comparison).
  62      *
  63      * @param  integer  the current Unix timestamp
  64      *
  65      * @return integer  the current date in a four byte DOS format
  66      *
  67      * @access private
  68      */
  69     function unix2DosTime($unixtime = 0) {
  70         $timearray = ($unixtime == 0) ? getdate() : getdate($unixtime);
  71
  72         if ($timearray['year'] < 1980) {
  73             $timearray['year']    = 1980;
  74             $timearray['mon']     = 1;
  75             $timearray['mday']    = 1;
  76             $timearray['hours']   = 0;
  77             $timearray['minutes'] = 0;
  78             $timearray['seconds'] = 0;
  79         } // end if
  80
  81         return (($timearray['year'] - 1980) << 25) | ($timearray['mon'] << 21) | ($timearray['mday'] << 16) |
  82                 ($timearray['hours'] << 11) | ($timearray['minutes'] << 5) | ($timearray['seconds'] >> 1);
  83     } // end of the 'unix2DosTime()' method
  84
  85
  86     /**
  87      * Adds "file" to archive
  88      *
  89      * @param  string   file contents
  90      * @param  string   name of the file in the archive (may contains the path)
  91      * @param  integer  the current timestamp
  92      *
  93      * @access public
  94      */
  95     function addFile($data, $name, $time = 0)
  96     {
  97         $name     = str_replace('\\', '/', $name);
  98
  99         $dtime    = dechex($this->unix2DosTime($time));
 100         $hexdtime = '\x' . $dtime[6] . $dtime[7]
 101                   . '\x' . $dtime[4] . $dtime[5]
 102                   . '\x' . $dtime[2] . $dtime[3]
 103                   . '\x' . $dtime[0] . $dtime[1];
 104         eval('$hexdtime = "' . $hexdtime . '";');
 105
 106         $fr   = "\x50\x4b\x03\x04";
 107         $fr   .= "\x14\x00";            // ver needed to extract
 108         $fr   .= "\x00\x00";            // gen purpose bit flag
 109         $fr   .= "\x08\x00";            // compression method
 110         $fr   .= $hexdtime;             // last mod time and date
 111
 112         // "local file header" segment
 113         $unc_len = strlen($data);
 114         $crc     = crc32($data);
 115         $zdata   = gzcompress($data);
 116         $zdata   = substr(substr($zdata, 0, strlen($zdata) - 4), 2); // fix crc bug
 117         $c_len   = strlen($zdata);
 118         $fr      .= pack('V', $crc);             // crc32
 119         $fr      .= pack('V', $c_len);           // compressed filesize
 120         $fr      .= pack('V', $unc_len);         // uncompressed filesize
 121         $fr      .= pack('v', strlen($name));    // length of filename
 122         $fr      .= pack('v', 0);                // extra field length
 123         $fr      .= $name;
 124
 125         // "file data" segment
 126         $fr .= $zdata;
 127
 128         // "data descriptor" segment (optional but necessary if archive is not
 129         // served as file)
 130         // this seems not to be needed at all and causes
 131         // problems in some cases (bug #1037737)
 132         //$fr .= pack('V', $crc);                 // crc32
 133         //$fr .= pack('V', $c_len);               // compressed filesize
 134         //$fr .= pack('V', $unc_len);             // uncompressed filesize
 135
 136         // add this entry to array
 137         $this -> datasec[] = $fr;
 138
 139         // now add to central directory record
 140         $cdrec = "\x50\x4b\x01\x02";
 141         $cdrec .= "\x00\x00";                // version made by
 142         $cdrec .= "\x14\x00";                // version needed to extract
 143         $cdrec .= "\x00\x00";                // gen purpose bit flag
 144         $cdrec .= "\x08\x00";                // compression method
 145         $cdrec .= $hexdtime;                 // last mod time & date
 146         $cdrec .= pack('V', $crc);           // crc32
 147         $cdrec .= pack('V', $c_len);         // compressed filesize
 148         $cdrec .= pack('V', $unc_len);       // uncompressed filesize
 149         $cdrec .= pack('v', strlen($name)); // length of filename
 150         $cdrec .= pack('v', 0);             // extra field length
 151         $cdrec .= pack('v', 0);             // file comment length
 152         $cdrec .= pack('v', 0);             // disk number start
 153         $cdrec .= pack('v', 0);             // internal file attributes
 154         $cdrec .= pack('V', 32);            // external file attributes - 'archive' bit set
 155
 156         $cdrec .= pack('V', $this -> old_offset); // relative offset of local header
 157         $this -> old_offset += strlen($fr);
 158
 159         $cdrec .= $name;
 160
 161         // optional extra field, file comment goes here
 162         // save to central directory
 163         $this -> ctrl_dir[] = $cdrec;
 164     } // end of the 'addFile()' method
 165
 166
 167     /**
 168      * Dumps out file
 169      *
 170      * @return  string  the zipped file
 171      *
 172      * @access public
 173      */
 174     function file()
 175     {
 176         $data    = implode('', $this -> datasec);
 177         $ctrldir = implode('', $this -> ctrl_dir);
 178
 179         return
 180             $data .
 181             $ctrldir .
 182             $this -> eof_ctrl_dir .
 183             pack('v', sizeof($this -> ctrl_dir)) .  // total # of entries "on this disk"
 184             pack('v', sizeof($this -> ctrl_dir)) .  // total # of entries overall
 185             pack('V', strlen($ctrldir)) .           // size of central dir
 186             pack('V', strlen($data)) .              // offset to start of central dir
 187             "\x00\x00";                             // .zip file comment length
 188     } // end of the 'file()' method
 189
 190 } // end of the 'zipfile' class
 191 ?>