phpmyadmin/libraries/zip.lib.php

   1 <?php
   2 /* vim: set expandtab sw=4 ts=4 sts=4: */
   3 /**
   4  *
   5  * @version $Id$
   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  */
  27 class zipfile
  28 {
  29     /**
  30      * Array to store compressed data
  31      *
  32      * @var  array    $datasec
  33      */
  34     var $datasec      = array();
  35
  36     /**
  37      * Central directory
  38      *
  39      * @var  array    $ctrl_dir
  40      */
  41     var $ctrl_dir     = array();
  42
  43     /**
  44      * End of central directory record
  45      *
  46      * @var  string   $eof_ctrl_dir
  47      */
  48     var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00";
  49
  50     /**
  51      * Last offset position
  52      *
  53      * @var  integer  $old_offset
  54      */
  55     var $old_offset   = 0;
  56
  57
  58     /**
  59      * Converts an Unix timestamp to a four byte DOS date and time format (date
  60      * in high two bytes, time in low two bytes allowing magnitude comparison).
  61      *
  62      * @param  integer  the current Unix timestamp
  63      *
  64      * @return integer  the current date in a four byte DOS format
  65      *
  66      * @access private
  67      */
  68     function unix2DosTime($unixtime = 0) {
  69         $timearray = ($unixtime == 0) ? getdate() : getdate($unixtime);
  70
  71         if ($timearray['year'] < 1980) {
  72             $timearray['year']    = 1980;
  73             $timearray['mon']     = 1;
  74             $timearray['mday']    = 1;
  75             $timearray['hours']   = 0;
  76             $timearray['minutes'] = 0;
  77             $timearray['seconds'] = 0;
  78         } // end if
  79
  80         return (($timearray['year'] - 1980) << 25) | ($timearray['mon'] << 21) | ($timearray['mday'] << 16) |
  81                 ($timearray['hours'] << 11) | ($timearray['minutes'] << 5) | ($timearray['seconds'] >> 1);
  82     } // end of the 'unix2DosTime()' method
  83
  84
  85     /**
  86      * Adds "file" to archive
  87      *
  88      * @param  string   file contents
  89      * @param  string   name of the file in the archive (may contains the path)
  90      * @param  integer  the current timestamp
  91      *
  92      * @access public
  93      */
  94     function addFile($data, $name, $time = 0)
  95     {
  96         $name     = str_replace('\\', '/', $name);
  97
  98         $dtime    = dechex($this->unix2DosTime($time));
  99         $hexdtime = '\x' . $dtime[6] . $dtime[7]
 100                   . '\x' . $dtime[4] . $dtime[5]
 101                   . '\x' . $dtime[2] . $dtime[3]
 102                   . '\x' . $dtime[0] . $dtime[1];
 103         eval('$hexdtime = "' . $hexdtime . '";');
 104
 105         $fr   = "\x50\x4b\x03\x04";
 106         $fr   .= "\x14\x00";            // ver needed to extract
 107         $fr   .= "\x00\x00";            // gen purpose bit flag
 108         $fr   .= "\x08\x00";            // compression method
 109         $fr   .= $hexdtime;             // last mod time and date
 110
 111         // "local file header" segment
 112         $unc_len = strlen($data);
 113         $crc     = crc32($data);
 114         $zdata   = gzcompress($data);
 115         $zdata   = substr(substr($zdata, 0, strlen($zdata) - 4), 2); // fix crc bug
 116         $c_len   = strlen($zdata);
 117         $fr      .= pack('V', $crc);             // crc32
 118         $fr      .= pack('V', $c_len);           // compressed filesize
 119         $fr      .= pack('V', $unc_len);         // uncompressed filesize
 120         $fr      .= pack('v', strlen($name));    // length of filename
 121         $fr      .= pack('v', 0);                // extra field length
 122         $fr      .= $name;
 123
 124         // "file data" segment
 125         $fr .= $zdata;
 126
 127         // "data descriptor" segment (optional but necessary if archive is not
 128         // served as file)
 129         // nijel(2004-10-19): this seems not to be needed at all and causes
 130         // problems in some cases (bug #1037737)
 131         //$fr .= pack('V', $crc);                 // crc32
 132         //$fr .= pack('V', $c_len);               // compressed filesize
 133         //$fr .= pack('V', $unc_len);             // uncompressed filesize
 134
 135         // add this entry to array
 136         $this -> datasec[] = $fr;
 137
 138         // now add to central directory record
 139         $cdrec = "\x50\x4b\x01\x02";
 140         $cdrec .= "\x00\x00";                // version made by
 141         $cdrec .= "\x14\x00";                // version needed to extract
 142         $cdrec .= "\x00\x00";                // gen purpose bit flag
 143         $cdrec .= "\x08\x00";                // compression method
 144         $cdrec .= $hexdtime;                 // last mod time & date
 145         $cdrec .= pack('V', $crc);           // crc32
 146         $cdrec .= pack('V', $c_len);         // compressed filesize
 147         $cdrec .= pack('V', $unc_len);       // uncompressed filesize
 148         $cdrec .= pack('v', strlen($name)); // length of filename
 149         $cdrec .= pack('v', 0);             // extra field length
 150         $cdrec .= pack('v', 0);             // file comment length
 151         $cdrec .= pack('v', 0);             // disk number start
 152         $cdrec .= pack('v', 0);             // internal file attributes
 153         $cdrec .= pack('V', 32);            // external file attributes - 'archive' bit set
 154
 155         $cdrec .= pack('V', $this -> old_offset); // relative offset of local header
 156         $this -> old_offset += strlen($fr);
 157
 158         $cdrec .= $name;
 159
 160         // optional extra field, file comment goes here
 161         // save to central directory
 162         $this -> ctrl_dir[] = $cdrec;
 163     } // end of the 'addFile()' method
 164
 165
 166     /**
 167      * Dumps out file
 168      *
 169      * @return  string  the zipped file
 170      *
 171      * @access public
 172      */
 173     function file()
 174     {
 175         $data    = implode('', $this -> datasec);
 176         $ctrldir = implode('', $this -> ctrl_dir);
 177
 178         return
 179             $data .
 180             $ctrldir .
 181             $this -> eof_ctrl_dir .
 182             pack('v', sizeof($this -> ctrl_dir)) .  // total # of entries "on this disk"
 183             pack('v', sizeof($this -> ctrl_dir)) .  // total # of entries overall
 184             pack('V', strlen($ctrldir)) .           // size of central dir
 185             pack('V', strlen($data)) .              // offset to start of central dir
 186             "\x00\x00";                             // .zip file comment length
 187     } // end of the 'file()' method
 188
 189 } // end of the 'zipfile' class
 190 ?>