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<?php |
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/** |
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* Created by PhpStorm. |
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* User: Giansalex |
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* Date: 16/07/2017 |
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* Time: 13:00. |
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*/ |
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namespace Greenter\Zip; |
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/** |
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* Class ZipFile. |
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*/ |
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class ZipFile |
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{ |
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/** |
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* Array to store compressed data. |
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* |
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* @private array $datasec |
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*/ |
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private $datasec = []; |
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/** |
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* Central directory. |
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* |
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* @private array $ctrl_dir |
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*/ |
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private $ctrl_dir = []; |
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/** |
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* End of central directory record. |
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* |
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* @private string $eof_ctrl_dir |
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*/ |
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private $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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* |
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* @private integer $old_offset |
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*/ |
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private $old_offset = 0; |
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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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* |
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* @param int $unixtime the current Unix timestamp |
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* |
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* @return int the current date in a four byte DOS format |
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*/ |
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public function unix2DosTime($unixtime = 0) |
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{ |
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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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return (($timearray['year'] - 1980) << 25) |
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| ($timearray['mon'] << 21) |
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| ($timearray['mday'] << 16) |
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| ($timearray['hours'] << 11) |
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| ($timearray['minutes'] << 5) |
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| ($timearray['seconds'] >> 1); |
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} |
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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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* |
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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 int $time the current timestamp |
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*/ |
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public function addFile($data, $name, $time = 0) |
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{ |
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$name = str_replace('\\', '/', $name); |
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$hexdtime = pack('V', $this->unix2DosTime($time)); |
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$frd = "\x50\x4b\x03\x04"; |
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$frd .= "\x14\x00"; // ver needed to extract |
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$frd .= "\x00\x00"; // gen purpose bit flag |
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$frd .= "\x08\x00"; // compression method |
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$frd .= $hexdtime; // last mod time and date |
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// "local file header" segment |
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$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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$frd .= pack('V', $crc); // crc32 |
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$frd .= pack('V', $c_len); // compressed filesize |
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$frd .= pack('V', $unc_len); // uncompressed filesize |
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$frd .= pack('v', strlen($name)); // length of filename |
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$frd .= pack('v', 0); // extra field length |
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$frd .= $name; |
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// "file data" segment |
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$frd .= $zdata; |
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// echo this entry on the fly, ... |
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$this->datasec[] = $frd; |
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// now add to central directory record |
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$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($frd); |
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$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[] = $cdrec; |
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} |
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// end of the 'addFile()' method |
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/** |
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* Echo central dir if ->doWrite==true, else build string to return. |
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* |
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* @return string if ->doWrite {empty string} else the ZIP file contents |
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*/ |
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public function file() |
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{ |
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$ctrldir = implode('', $this->ctrl_dir); |
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$header = $ctrldir. |
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$this->eof_ctrl_dir. |
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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', $this->old_offset). //offset to start of central dir |
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"\x00\x00"; //.zip file comment length |
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// Return entire ZIP archive as string |
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$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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giansalex /
greenter
