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<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
* Zip file creation
*
* @package PhpMyAdmin
*/
/**
* Zip file creation class.
* Makes zip files.
*
* @access public
* @package PhpMyAdmin
* @see Official ZIP file format: http://www.pkware.com/support/zip-app-note
*/
class N2ZipCreator {
/**
* Whether to echo zip as it's built or return as string from -> file
*
* @var boolean $doWrite
*/
var $doWrite = false;
/**
* 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;
/**
* Sets member variable this -> doWrite to true
* - Should be called immediately after class instantiantion
* - If set to true, then ZIP archive are echo'ed to STDOUT as each
* file is added via this -> addfile(), and central directories are
* echoed to STDOUT on final call to this -> file(). Also,
* this -> file() returns an empty string so it is safe to issue a
* "echo $zipfile;" command
*
* @access public
*
* @return void
*/
function setDoWrite() {
$this->doWrite = true;
} // end of the 'setDoWrite()' method
/**
* 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 $unixtime the current Unix timestamp
*
* @return integer the current date in a four byte DOS format
*
* @access private
*/
function unix2DosTime($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 $data file contents
* @param string $name name of the file in the archive (may contains the path)
* @param integer $time the current timestamp
*
* @access public
*
* @return void
*/
function addFile($data, $name, $time = 0) {
$name = str_replace('\\', '/', $name);
$hexdtime = pack('V', $this->unix2DosTime($time));
$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 .= $zdata;
// echo this entry on the fly, ...
if ($this->doWrite) {
echo $fr;
} else { // ... OR 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
/**
* Echo central dir if ->doWrite==true, else build string to return
*
* @return string if ->doWrite {empty string} else the ZIP file contents
*
* @access public
*/
function file() {
$ctrldir = implode('', $this->ctrl_dir);
$header = $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', $this->old_offset) . //offset to start of central dir
"\x00\x00"; //.zip file comment length
if ($this->doWrite) { // Send central directory & end ctrl dir to STDOUT
echo $header;
return ""; // Return empty string
} else { // Return entire ZIP archive as string
$data = implode('', $this->datasec);
return $data . $header;
}
} // end of the 'file()' method
} // end of the 'ZipFile' class
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