libraries/zip.lib.php3

   1 <?php
   2 /* $Id$ */
   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.php3?id=535&single=1
  13  *  By Eric Mueller <eric@themepark.com>
  14  *
  15  *  http://www.zend.com/codex.php3?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         $fr .= pack('V', $crc);                 // crc32
 128         $fr .= pack('V', $c_len);               // compressed filesize
 129         $fr .= pack('V', $unc_len);             // uncompressed filesize
 130
 131         // add this entry to array
 132         $this -> datasec[] = $fr;
 133         $new_offset        = strlen(implode('', $this->datasec));
 134
 135         // now add to central directory record
 136         $cdrec = "\x50\x4b\x01\x02";
 137         $cdrec .= "\x00\x00";                // version made by
 138         $cdrec .= "\x14\x00";                // version needed to extract
 139         $cdrec .= "\x00\x00";                // gen purpose bit flag
 140         $cdrec .= "\x08\x00";                // compression method
 141         $cdrec .= $hexdtime;                 // last mod time & date
 142         $cdrec .= pack('V', $crc);           // crc32
 143         $cdrec .= pack('V', $c_len);         // compressed filesize
 144         $cdrec .= pack('V', $unc_len);       // uncompressed filesize
 145         $cdrec .= pack('v', strlen($name) ); // length of filename
 146         $cdrec .= pack('v', 0 );             // extra field length
 147         $cdrec .= pack('v', 0 );             // file comment length
 148         $cdrec .= pack('v', 0 );             // disk number start
 149         $cdrec .= pack('v', 0 );             // internal file attributes
 150         $cdrec .= pack('V', 32 );            // external file attributes - 'archive' bit set
 151
 152         $cdrec .= pack('V', $this -> old_offset ); // relative offset of local header
 153         $this -> old_offset = $new_offset;
 154
 155         $cdrec .= $name;
 156
 157         // optional extra field, file comment goes here
 158         // save to central directory
 159         $this -> ctrl_dir[] = $cdrec;
 160     } // end of the 'addFile()' method
 161
 162
 163     /**
 164      * Dumps out file
 165      *
 166      * @return  string  the zipped file
 167      *
 168      * @access public
 169      */
 170     function file()
 171     {
 172         $data    = implode('', $this -> datasec);
 173         $ctrldir = implode('', $this -> ctrl_dir);
 174
 175         return
 176             $data .
 177             $ctrldir .
 178             $this -> eof_ctrl_dir .
 179             pack('v', sizeof($this -> ctrl_dir)) .  // total # of entries "on this disk"
 180             pack('v', sizeof($this -> ctrl_dir)) .  // total # of entries overall
 181             pack('V', strlen($ctrldir)) .           // size of central dir
 182             pack('V', strlen($data)) .              // offset to start of central dir
 183             "\x00\x00";                             // .zip file comment length
 184     } // end of the 'file()' method
 185
 186 } // end of the 'zipfile' class
 187 ?>