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<?php

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namespace Nextend\Framework\Misc\Zip;

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/**

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* Zip file creation class.

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* Makes zip files.

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* @access public

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* @package PhpMyAdmin

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* @see Official ZIP file format: http://www.pkware.com/support/zip-app-note

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class Creator {

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/**

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* Whether to echo zip as it's built or return as string from -> file

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* @var boolean $doWrite

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var $doWrite = false;

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/**

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* Array to store compressed data

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* @var array $datasec

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var $datasec = array();

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/**

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* Central directory

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* @var array $ctrl_dir

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var $ctrl_dir = array();

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/**

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* End of central directory record

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* @var string $eof_ctrl_dir

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var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00";

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/**

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* Last offset position

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* @var integer $old_offset

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var $old_offset = 0;

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/**

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* Sets member variable this -> doWrite to true

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* - Should be called immediately after class instantiantion

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* - If set to true, then ZIP archive are echo'ed to STDOUT as each

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* file is added via this -> addfile(), and central directories are

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* echoed to STDOUT on final call to this -> file(). Also,

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* this -> file() returns an empty string so it is safe to issue a

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* "echo $zipfile;" command

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* @access public

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* @return void

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function setDoWrite() {

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$this->doWrite = true;

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} // end of the 'setDoWrite()' method

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/**

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* Converts an Unix timestamp to a four byte DOS date and time format (date

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* in high two bytes, time in low two bytes allowing magnitude comparison).

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* @param integer $unixtime the current Unix timestamp

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* @return integer the current date in a four byte DOS format

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* @access private

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function unix2DosTime($unixtime = 0) {

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$timearray = ($unixtime == 0) ? getdate() : getdate($unixtime);

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if ($timearray['year'] < 1980) {

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$timearray['year'] = 1980;

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$timearray['mon'] = 1;

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$timearray['mday'] = 1;

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$timearray['hours'] = 0;

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$timearray['minutes'] = 0;

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$timearray['seconds'] = 0;

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} // end if

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} // end of the 'unix2DosTime()' method

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/**

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* Adds "file" to archive

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* @param string $data file contents

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* @param string $name name of the file in the archive (may contains the path)

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* @param integer $time the current timestamp

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* @access public

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* @return void

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function addFile($data, $name, $time = 0) {

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$name = str_replace('\\', '/', $name);

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$hexdtime = pack('V', $this->unix2DosTime($time));

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$fr = "\x50\x4b\x03\x04";

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$fr .= "\x14\x00"; // ver needed to extract

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$fr .= "\x00\x00"; // gen purpose bit flag

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$fr .= "\x08\x00"; // compression method

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$fr .= $hexdtime; // last mod time and date

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// "local file header" segment

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$unc_len = strlen($data);

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$crc = crc32($data);

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$zdata = gzcompress($data);

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$zdata = substr(substr($zdata, 0, strlen($zdata) - 4), 2); // fix crc bug

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$c_len = strlen($zdata);

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$fr .= pack('V', $crc); // crc32

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$fr .= pack('V', $c_len); // compressed filesize

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$fr .= pack('V', $unc_len); // uncompressed filesize

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$fr .= pack('v', strlen($name)); // length of filename

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$fr .= pack('v', 0); // extra field length

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$fr .= $name;

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// "file data" segment

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$fr .= $zdata;

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// echo this entry on the fly, ...

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if ($this->doWrite) {

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// PHPCS - The value contains zip file binary data, so nothing to escape

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echo $fr; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped

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} else { // ... OR add this entry to array

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$this->datasec[] = $fr;

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}

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// now add to central directory record

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$cdrec = "\x50\x4b\x01\x02";

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$cdrec .= "\x00\x00"; // version made by

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$cdrec .= "\x14\x00"; // version needed to extract

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$cdrec .= "\x00\x00"; // gen purpose bit flag

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$cdrec .= "\x08\x00"; // compression method

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$cdrec .= $hexdtime; // last mod time & date

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$cdrec .= pack('V', $crc); // crc32

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$cdrec .= pack('V', $c_len); // compressed filesize

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$cdrec .= pack('V', $unc_len); // uncompressed filesize

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$cdrec .= pack('v', strlen($name)); // length of filename

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$cdrec .= pack('v', 0); // extra field length

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$cdrec .= pack('v', 0); // file comment length

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$cdrec .= pack('v', 0); // disk number start

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$cdrec .= pack('v', 0); // internal file attributes

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$cdrec .= pack('V', 32); // external file attributes

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// - 'archive' bit set

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$cdrec .= pack('V', $this->old_offset); // relative offset of local header

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$this->old_offset += strlen($fr);

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$cdrec .= $name;

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// optional extra field, file comment goes here

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// save to central directory

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$this->ctrl_dir[] = $cdrec;

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} // end of the 'addFile()' method

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/**

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* Echo central dir if ->doWrite==true, else build string to return

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* @return string if ->doWrite {empty string} else the ZIP file contents

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* @access public

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function file() {

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$ctrldir = implode('', $this->ctrl_dir);

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$header = $ctrldir . $this->eof_ctrl_dir . pack('v', sizeof($this->ctrl_dir)) . //total #of entries "on this disk"

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pack('v', sizeof($this->ctrl_dir)) . //total #of entries overall

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pack('V', strlen($ctrldir)) . //size of central dir

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pack('V', $this->old_offset) . //offset to start of central dir

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"\x00\x00"; //.zip file comment length

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if ($this->doWrite) { // Send central directory & end ctrl dir to STDOUT

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// PHPCS - The value is zip file binary header, so nothing to escape.

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echo $header; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped

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return ""; // Return empty string

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} else { // Return entire ZIP archive as string

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$data = implode('', $this->datasec);

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return $data . $header;

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}

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} // end of the 'file()' method

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}

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