[Sommaire] [Imprimer]

   1  <?php
   2  /* $Id: zip.lib.php 6461 2004-11-03 13:56:52Z garvinhicking $ */
   3  // vim: expandtab sw=4 ts=4 sts=4:
   4  
   5  
   6  /**
   7   * Zip file creation class.
   8   * Makes zip files.
   9   *
  10   * Based on :
  11   *
  12   *  http://www.zend.com/codex.php?id=535&single=1
  13   *  By Eric Mueller <eric@themepark.com>
  14   *
  15   *  http://www.zend.com/codex.php?id=470&single=1
  16   *  by Denis125 <webmaster@atlant.ru>
  17   *
  18   *  a patch from Peter Listiak <mlady@users.sourceforge.net> for last modified
  19   *  date and time of the compressed file
  20   *
  21   * Official ZIP file format: http://www.pkware.com/appnote.txt
  22   *
  23   * @access  public
  24   */
  25  class zipfile
  26  {
  27      /**
  28       * Array to store compressed data
  29       *
  30       * @var  array    $datasec
  31       */
  32      var $datasec      = array();
  33  
  34      /**
  35       * Central directory
  36       *
  37       * @var  array    $ctrl_dir
  38       */
  39      var $ctrl_dir     = array();
  40  
  41      /**
  42       * End of central directory record
  43       *
  44       * @var  string   $eof_ctrl_dir
  45       */
  46      var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00";
  47  
  48      /**
  49       * Last offset position
  50       *
  51       * @var  integer  $old_offset
  52       */
  53      var $old_offset   = 0;
  54  
  55  
  56      /**
  57       * Converts an Unix timestamp to a four byte DOS date and time format (date
  58       * in high two bytes, time in low two bytes allowing magnitude comparison).
  59       *
  60       * @param  integer  the current Unix timestamp
  61       *
  62       * @return integer  the current date in a four byte DOS format
  63       *
  64       * @access private
  65       */
  66      function unix2DosTime($unixtime = 0) {
  67          $timearray = ($unixtime == 0) ? getdate() : getdate($unixtime);
  68  
  69          if ($timearray['year'] < 1980) {
  70              $timearray['year']    = 1980;
  71              $timearray['mon']     = 1;
  72              $timearray['mday']    = 1;
  73              $timearray['hours']   = 0;
  74              $timearray['minutes'] = 0;
  75              $timearray['seconds'] = 0;
  76          } // end if
  77  
  78          return (($timearray['year'] - 1980) << 25) | ($timearray['mon'] << 21) | ($timearray['mday'] << 16) |
  79                  ($timearray['hours'] << 11) | ($timearray['minutes'] << 5) | ($timearray['seconds'] >> 1);
  80      } // end of the 'unix2DosTime()' method
  81  
  82  
  83      /**
  84       * Adds "file" to archive
  85       *
  86       * @param  string   file contents
  87       * @param  string   name of the file in the archive (may contains the path)
  88       * @param  integer  the current timestamp
  89       *
  90       * @access public
  91       */
  92      function addFile($data, $name, $time = 0)
  93      {
  94          $name     = str_replace('\\', '/', $name);
  95  
  96          $dtime    = dechex($this->unix2DosTime($time));
  97          $hexdtime = '\x' . $dtime[6] . $dtime[7]
  98                    . '\x' . $dtime[4] . $dtime[5]
  99                    . '\x' . $dtime[2] . $dtime[3]
 100                    . '\x' . $dtime[0] . $dtime[1];
 101          eval('$hexdtime = "' . $hexdtime . '";');
 102  
 103          $fr   = "\x50\x4b\x03\x04";
 104          $fr   .= "\x14\x00";            // ver needed to extract
 105          $fr   .= "\x00\x00";            // gen purpose bit flag
 106          $fr   .= "\x08\x00";            // compression method
 107          $fr   .= $hexdtime;             // last mod time and date
 108  
 109          // "local file header" segment
 110          $unc_len = strlen($data);
 111          $crc     = crc32($data);
 112          $zdata   = gzcompress($data);
 113          $zdata   = substr(substr($zdata, 0, strlen($zdata) - 4), 2); // fix crc bug
 114          $c_len   = strlen($zdata);
 115          $fr      .= pack('V', $crc);             // crc32
 116          $fr      .= pack('V', $c_len);           // compressed filesize
 117          $fr      .= pack('V', $unc_len);         // uncompressed filesize
 118          $fr      .= pack('v', strlen($name));    // length of filename
 119          $fr      .= pack('v', 0);                // extra field length
 120          $fr      .= $name;
 121  
 122          // "file data" segment
 123          $fr .= $zdata;
 124  
 125          // "data descriptor" segment (optional but necessary if archive is not
 126          // served as file)
 127          // nijel(2004-10-19): this seems not to be needed at all and causes
 128          // problems in some cases (bug #1037737)
 129          //$fr .= pack('V', $crc);                 // crc32
 130          //$fr .= pack('V', $c_len);               // compressed filesize
 131          //$fr .= pack('V', $unc_len);             // uncompressed filesize
 132  
 133          // add this entry to array
 134          $this -> datasec[] = $fr;
 135  
 136          // now add to central directory record
 137          $cdrec = "\x50\x4b\x01\x02";
 138          $cdrec .= "\x00\x00";                // version made by
 139          $cdrec .= "\x14\x00";                // version needed to extract
 140          $cdrec .= "\x00\x00";                // gen purpose bit flag
 141          $cdrec .= "\x08\x00";                // compression method
 142          $cdrec .= $hexdtime;                 // last mod time & date
 143          $cdrec .= pack('V', $crc);           // crc32
 144          $cdrec .= pack('V', $c_len);         // compressed filesize
 145          $cdrec .= pack('V', $unc_len);       // uncompressed filesize
 146          $cdrec .= pack('v', strlen($name) ); // length of filename
 147          $cdrec .= pack('v', 0 );             // extra field length
 148          $cdrec .= pack('v', 0 );             // file comment length
 149          $cdrec .= pack('v', 0 );             // disk number start
 150          $cdrec .= pack('v', 0 );             // internal file attributes
 151          $cdrec .= pack('V', 32 );            // external file attributes - 'archive' bit set
 152  
 153          $cdrec .= pack('V', $this -> old_offset ); // relative offset of local header
 154          $this -> old_offset += strlen($fr);
 155  
 156          $cdrec .= $name;
 157  
 158          // optional extra field, file comment goes here
 159          // save to central directory
 160          $this -> ctrl_dir[] = $cdrec;
 161      } // end of the 'addFile()' method
 162  
 163  
 164      /**
 165       * Dumps out file
 166       *
 167       * @return  string  the zipped file
 168       *
 169       * @access public
 170       */
 171      function file()
 172      {
 173          $data    = implode('', $this -> datasec);
 174          $ctrldir = implode('', $this -> ctrl_dir);
 175  
 176          return
 177              $data .
 178              $ctrldir .
 179              $this -> eof_ctrl_dir .
 180              pack('v', sizeof($this -> ctrl_dir)) .  // total # of entries "on this disk"
 181              pack('v', sizeof($this -> ctrl_dir)) .  // total # of entries overall
 182              pack('V', strlen($ctrldir)) .           // size of central dir
 183              pack('V', strlen($data)) .              // offset to start of central dir
 184              "\x00\x00";                             // .zip file comment length
 185      } // end of the 'file()' method
 186  
 187  } // end of the 'zipfile' class
 188  ?>