Location: PHPKode > projects > MyFtPhp > myftphp_libs/zip.lib.php
<?php
// slightly modified to omit getdate errors...

/* $Id: zip.lib.php,v 1.2 2007/08/19 15:04:49 mkf Exp $ */
// vim: expandtab sw=4 ts=4 sts=4:


/**
 * Zip file creation class.
 * Makes zip files.
 *
 * Based on :
 *
 *  http://www.zend.com/codex.php?id=535&single=1
 *  By Eric Mueller <hide@address.com>
 *
 *  http://www.zend.com/codex.php?id=470&single=1
 *  by Denis125 <hide@address.com>
 *
 *  a patch from Peter Listiak <hide@address.com> for last modified
 *  date and time of the compressed file
 *
 * Official ZIP file format: http://www.pkware.com/appnote.txt
 *
 * @access  public
 */
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;
				}

				return (($timearray['year'] - 1980) << 25) | ($timearray['mon'] << 21) | ($timearray['mday'] << 16) |
								($timearray['hours'] << 11) | ($timearray['minutes'] << 5) | ($timearray['seconds'] >> 1);
		}

		/**
		 * 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;
		}

		/**
		 * 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
		}
}
?>
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