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185 lines
6.3 KiB
185 lines
6.3 KiB
<?php
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/**
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* Zip file creation class.
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* Makes zip files.
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* From phpmyadmin <http://tinyurl.com/fjpwx>
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*
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* Based on :
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*
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* http://www.zend.com/codex.php?id=535&single=1
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* By Eric Mueller <eric@themepark.com>
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*
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* http://www.zend.com/codex.php?id=470&single=1
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* by Denis125 <webmaster@atlant.ru>
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*
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* a patch from Peter Listiak <mlady@users.sourceforge.net> for last modified
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* date and time of the compressed file
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*
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* Official ZIP file format: http://www.pkware.com/appnote.txt
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*
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* @access public
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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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* @var array $datasec
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*/
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var $datasec = array();
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/**
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* Central directory
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*
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* @var array $ctrl_dir
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*/
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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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*
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* @var string $eof_ctrl_dir
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*/
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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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*
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* @var integer $old_offset
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*/
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var $old_offset = 0;
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/**
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* Converts an Unix timestamp to a four byte DOS date and time format (date
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* in high two bytes, time in low two bytes allowing magnitude comparison).
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*
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* @param integer the current Unix timestamp
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*
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* @return integer the current date in a four byte DOS format
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*
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* @access private
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*/
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function unix2DosTime($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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return (($timearray['year'] - 1980) << 25) | ($timearray['mon'] << 21) | ($timearray['mday'] << 16) |
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($timearray['hours'] << 11) | ($timearray['minutes'] << 5) | ($timearray['seconds'] >> 1);
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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 file contents
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* @param string name of the file in the archive (may contains the path)
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* @param integer the current timestamp
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*
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* @access public
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*/
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function addFile($data, $name, $time = 0)
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{
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$name = str_replace('\\', '/', $name);
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$dtime = dechex($this->unix2DosTime($time));
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$hexdtime = '\x' . $dtime[6] . $dtime[7]
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. '\x' . $dtime[4] . $dtime[5]
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. '\x' . $dtime[2] . $dtime[3]
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. '\x' . $dtime[0] . $dtime[1];
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eval('$hexdtime = "' . $hexdtime . '";');
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$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 .= $zdata;
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// "data descriptor" segment (optional but necessary if archive is not
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// served as file)
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// nijel(2004-10-19): this seems not to be needed at all and causes
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// problems in some cases (bug #1037737)
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//$fr .= pack('V', $crc); // crc32
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//$fr .= pack('V', $c_len); // compressed filesize
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//$fr .= pack('V', $unc_len); // uncompressed filesize
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// add this entry to array
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$this -> datasec[] = $fr;
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// now add to central directory record
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$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 - '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[] = $cdrec;
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} // end of the 'addFile()' method
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/**
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* Dumps out file
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*
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* @return string the zipped file
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*
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* @access public
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*/
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function file()
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{
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$data = implode('', $this -> datasec);
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$ctrldir = implode('', $this -> ctrl_dir);
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return
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$data .
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$ctrldir .
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$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($ctrldir)) . // size of central dir
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pack('V', strlen($data)) . // offset to start of central dir
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"\x00\x00"; // .zip file comment length
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} // end of the 'file()' method
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} // end of the 'zipfile' class
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?>
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