Viewing file: zip.lib.php (6.38 KB) -rw-rw-rw- Select action/file-type: (+) | (+) | (+) | Code (+) | Session (+) | (+) | SDB (+) | (+) | (+) | (+) | (+) | (+) |
<?php /* vim: set expandtab sw=4 ts=4 sts=4: */ /** * * @version $Id: zip.lib.php 11986 2008-11-24 11:05:40Z nijel $ * @package phpMyAdmin */
/** * Zip file creation class. * Makes zip files. * * Based on : * * http://www.zend.com/codex.php?id=535&single=1 * By Eric Mueller <eric@themepark.com> * * http://www.zend.com/codex.php?id=470&single=1 * by Denis125 <webmaster@atlant.ru> * * a patch from Peter Listiak <mlady@users.sourceforge.net> for last modified * date and time of the compressed file * * Official ZIP file format: http://www.pkware.com/appnote.txt * * @access public * @package phpMyAdmin */ class zipfile { /** * Array to store compressed data * * @var array $datasec */ var $datasec = array();
/** * Central directory * * @var array $ctrl_dir */ var $ctrl_dir = array();
/** * End of central directory record * * @var string $eof_ctrl_dir */ var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00";
/** * Last offset position * * @var integer $old_offset */ var $old_offset = 0;
/** * Converts an Unix timestamp to a four byte DOS date and time format (date * in high two bytes, time in low two bytes allowing magnitude comparison). * * @param integer the current Unix timestamp * * @return integer the current date in a four byte DOS format * * @access private */ function unix2DosTime($unixtime = 0) { $timearray = ($unixtime == 0) ? getdate() : getdate($unixtime);
if ($timearray['year'] < 1980) { $timearray['year'] = 1980; $timearray['mon'] = 1; $timearray['mday'] = 1; $timearray['hours'] = 0; $timearray['minutes'] = 0; $timearray['seconds'] = 0; } // end if
return (($timearray['year'] - 1980) << 25) | ($timearray['mon'] << 21) | ($timearray['mday'] << 16) | ($timearray['hours'] << 11) | ($timearray['minutes'] << 5) | ($timearray['seconds'] >> 1); } // end of the 'unix2DosTime()' method
/** * Adds "file" to archive * * @param string file contents * @param string name of the file in the archive (may contains the path) * @param integer the current timestamp * * @access public */ function addFile($data, $name, $time = 0) { $name = str_replace('\\', '/', $name);
$dtime = dechex($this->unix2DosTime($time)); $hexdtime = '\x' . $dtime[6] . $dtime[7] . '\x' . $dtime[4] . $dtime[5] . '\x' . $dtime[2] . $dtime[3] . '\x' . $dtime[0] . $dtime[1]; eval('$hexdtime = "' . $hexdtime . '";');
$fr = "\x50\x4b\x03\x04"; $fr .= "\x14\x00"; // ver needed to extract $fr .= "\x00\x00"; // gen purpose bit flag $fr .= "\x08\x00"; // compression method $fr .= $hexdtime; // last mod time and date
// "local file header" segment $unc_len = strlen($data); $crc = crc32($data); $zdata = gzcompress($data); $zdata = substr(substr($zdata, 0, strlen($zdata) - 4), 2); // fix crc bug $c_len = strlen($zdata); $fr .= pack('V', $crc); // crc32 $fr .= pack('V', $c_len); // compressed filesize $fr .= pack('V', $unc_len); // uncompressed filesize $fr .= pack('v', strlen($name)); // length of filename $fr .= pack('v', 0); // extra field length $fr .= $name;
// "file data" segment $fr .= $zdata;
// "data descriptor" segment (optional but necessary if archive is not // served as file) // nijel(2004-10-19): this seems not to be needed at all and causes // problems in some cases (bug #1037737) //$fr .= pack('V', $crc); // crc32 //$fr .= pack('V', $c_len); // compressed filesize //$fr .= pack('V', $unc_len); // uncompressed filesize
// add this entry to array $this -> datasec[] = $fr;
// now add to central directory record $cdrec = "\x50\x4b\x01\x02"; $cdrec .= "\x00\x00"; // version made by $cdrec .= "\x14\x00"; // version needed to extract $cdrec .= "\x00\x00"; // gen purpose bit flag $cdrec .= "\x08\x00"; // compression method $cdrec .= $hexdtime; // last mod time & date $cdrec .= pack('V', $crc); // crc32 $cdrec .= pack('V', $c_len); // compressed filesize $cdrec .= pack('V', $unc_len); // uncompressed filesize $cdrec .= pack('v', strlen($name)); // length of filename $cdrec .= pack('v', 0); // extra field length $cdrec .= pack('v', 0); // file comment length $cdrec .= pack('v', 0); // disk number start $cdrec .= pack('v', 0); // internal file attributes $cdrec .= pack('V', 32); // external file attributes - 'archive' bit set
$cdrec .= pack('V', $this -> old_offset); // relative offset of local header $this -> old_offset += strlen($fr);
$cdrec .= $name;
// optional extra field, file comment goes here // save to central directory $this -> ctrl_dir[] = $cdrec; } // end of the 'addFile()' method
/** * Dumps out file * * @return string the zipped file * * @access public */ function file() { $data = implode('', $this -> datasec); $ctrldir = implode('', $this -> ctrl_dir);
return $data . $ctrldir . $this -> eof_ctrl_dir . pack('v', sizeof($this -> ctrl_dir)) . // total # of entries "on this disk" pack('v', sizeof($this -> ctrl_dir)) . // total # of entries overall pack('V', strlen($ctrldir)) . // size of central dir pack('V', strlen($data)) . // offset to start of central dir "\x00\x00"; // .zip file comment length } // end of the 'file()' method
} // end of the 'zipfile' class ?>
|