libraries/zip.lib.php

   1 <?php
   2 /* vim: set expandtab sw=4 ts=4 sts=4: */
   3 /**
   4  *
   5  * @version $Id$
   6  * @package phpMyAdmin
   7  */
   8
   9 /**
  10  * Zip file creation class.
  11  * Makes zip files.
  12  *
  13  * Based on :
  14  *
  15  *  http://www.zend.com/codex.php?id=535&single=1
  16  *  By Eric Mueller <eric@themepark.com>
  17  *
  18  *  http://www.zend.com/codex.php?id=470&single=1
  19  *  by Denis125 <webmaster@atlant.ru>
  20  *
  21  *  a patch from Peter Listiak <mlady@users.sourceforge.net> for last modified
  22  *  date and time of the compressed file
  23  *
  24  * Official ZIP file format: http://www.pkware.com/appnote.txt
  25  *
  26  * @access  public
  27  * @package phpMyAdmin
  28  */
  29 class zipfile
  30 {
  31     /**
  32      * Array to store compressed data
  33      *
  34      * @var  array    $datasec
  35      */
  36     var $datasec      = array();
  37
  38     /**
  39      * Central directory
  40      *
  41      * @var  array    $ctrl_dir
  42      */
  43     var $ctrl_dir     = array();
  44
  45     /**
  46      * End of central directory record
  47      *
  48      * @var  string   $eof_ctrl_dir
  49      */
  50     var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00";
  51
  52     /**
  53      * Last offset position
  54      *
  55      * @var  integer  $old_offset
  56      */
  57     var $old_offset   = 0;
  58
  59
  60     /**
  61      * Converts an Unix timestamp to a four byte DOS date and time format (date
  62      * in high two bytes, time in low two bytes allowing magnitude comparison).
  63      *
  64      * @param  integer  the current Unix timestamp
  65      *
  66      * @return integer  the current date in a four byte DOS format
  67      *
  68      * @access private
  69      */
  70     function unix2DosTime($unixtime = 0) {
  71         $timearray = ($unixtime == 0) ? getdate() : getdate($unixtime);
  72
  73         if ($timearray['year'] < 1980) {
  74             $timearray['year']    = 1980;
  75             $timearray['mon']     = 1;
  76             $timearray['mday']    = 1;
  77             $timearray['hours']   = 0;
  78             $timearray['minutes'] = 0;
  79             $timearray['seconds'] = 0;
  80         } // end if
  81
  82         return (($timearray['year'] - 1980) << 25) | ($timearray['mon'] << 21) | ($timearray['mday'] << 16) |
  83                 ($timearray['hours'] << 11) | ($timearray['minutes'] << 5) | ($timearray['seconds'] >> 1);
  84     } // end of the 'unix2DosTime()' method
  85
  86
  87     /**
  88      * Adds "file" to archive
  89      *
  90      * @param  string   file contents
  91      * @param  string   name of the file in the archive (may contains the path)
  92      * @param  integer  the current timestamp
  93      *
  94      * @access public
  95      */
  96     function addFile($data, $name, $time = 0)
  97     {
  98         $name     = str_replace('\\', '/', $name);
  99
 100         $dtime    = dechex($this->unix2DosTime($time));
 101         $hexdtime = '\x' . $dtime[6] . $dtime[7]
 102                   . '\x' . $dtime[4] . $dtime[5]
 103                   . '\x' . $dtime[2] . $dtime[3]
 104                   . '\x' . $dtime[0] . $dtime[1];
 105         eval('$hexdtime = "' . $hexdtime . '";');
 106
 107         $fr   = "\x50\x4b\x03\x04";
 108         $fr   .= "\x14\x00";            // ver needed to extract
 109         $fr   .= "\x00\x00";            // gen purpose bit flag
 110         $fr   .= "\x08\x00";            // compression method
 111         $fr   .= $hexdtime;             // last mod time and date
 112
 113         // "local file header" segment
 114         $unc_len = strlen($data);
 115         $crc     = crc32($data);
 116         $zdata   = gzcompress($data);
 117         $zdata   = substr(substr($zdata, 0, strlen($zdata) - 4), 2); // fix crc bug
 118         $c_len   = strlen($zdata);
 119         $fr      .= pack('V', $crc);             // crc32
 120         $fr      .= pack('V', $c_len);           // compressed filesize
 121         $fr      .= pack('V', $unc_len);         // uncompressed filesize
 122         $fr      .= pack('v', strlen($name));    // length of filename
 123         $fr      .= pack('v', 0);                // extra field length
 124         $fr      .= $name;
 125
 126         // "file data" segment
 127         $fr .= $zdata;
 128
 129         // "data descriptor" segment (optional but necessary if archive is not
 130         // served as file)
 131         // nijel(2004-10-19): this seems not to be needed at all and causes
 132         // problems in some cases (bug #1037737)
 133         //$fr .= pack('V', $crc);                 // crc32
 134         //$fr .= pack('V', $c_len);               // compressed filesize
 135         //$fr .= pack('V', $unc_len);             // uncompressed filesize
 136
 137         // add this entry to array
 138         $this -> datasec[] = $fr;
 139
 140         // now add to central directory record
 141         $cdrec = "\x50\x4b\x01\x02";
 142         $cdrec .= "\x00\x00";                // version made by
 143         $cdrec .= "\x14\x00";                // version needed to extract
 144         $cdrec .= "\x00\x00";                // gen purpose bit flag
 145         $cdrec .= "\x08\x00";                // compression method
 146         $cdrec .= $hexdtime;                 // last mod time & date
 147         $cdrec .= pack('V', $crc);           // crc32
 148         $cdrec .= pack('V', $c_len);         // compressed filesize
 149         $cdrec .= pack('V', $unc_len);       // uncompressed filesize
 150         $cdrec .= pack('v', strlen($name)); // length of filename
 151         $cdrec .= pack('v', 0);             // extra field length
 152         $cdrec .= pack('v', 0);             // file comment length
 153         $cdrec .= pack('v', 0);             // disk number start
 154         $cdrec .= pack('v', 0);             // internal file attributes
 155         $cdrec .= pack('V', 32);            // external file attributes - 'archive' bit set
 156
 157         $cdrec .= pack('V', $this -> old_offset); // relative offset of local header
 158         $this -> old_offset += strlen($fr);
 159
 160         $cdrec .= $name;
 161
 162         // optional extra field, file comment goes here
 163         // save to central directory
 164         $this -> ctrl_dir[] = $cdrec;
 165     } // end of the 'addFile()' method
 166
 167
 168     /**
 169      * Dumps out file
 170      *
 171      * @return  string  the zipped file
 172      *
 173      * @access public
 174      */
 175     function file()
 176     {
 177         $data    = implode('', $this -> datasec);
 178         $ctrldir = implode('', $this -> ctrl_dir);
 179
 180         return
 181             $data .
 182             $ctrldir .
 183             $this -> eof_ctrl_dir .
 184             pack('v', sizeof($this -> ctrl_dir)) .  // total # of entries "on this disk"
 185             pack('v', sizeof($this -> ctrl_dir)) .  // total # of entries overall
 186             pack('V', strlen($ctrldir)) .           // size of central dir
 187             pack('V', strlen($data)) .              // offset to start of central dir
 188             "\x00\x00";                             // .zip file comment length
 189     } // end of the 'file()' method
 190
 191 } // end of the 'zipfile' class
 192 ?>