zip.php

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	 * Get the list of files/data from a ZIP archive buffer.
	 *
	 * @access	private
	 * @param 	string	$data	The ZIP archive buffer.
	 * @return	array	Archive metadata array
	 * <pre>
	 * KEY: Position in zipfile
	 * VALUES: 'attr'    --  File attributes
	 *         'crc'     --  CRC checksum
	 *         'csize'   --  Compressed file size
	 *         'date'    --  File modification time
	 *         'name'    --  Filename
	 *         'method'  --  Compression method
	 *         'size'    --  Original file size
	 *         'type'    --  File type
	 * </pre>
	 * @since	1.5
	 */
	function _getZipInfo(& $data)
	{
		// Initialize variables
		$entries = array ();

		// Find the last central directory header entry
		$fhLast = strpos($data, $this->_ctrlDirEnd);
		do {
			$last = $fhLast;		
		} while(($fhLast = strpos($data, $this->_ctrlDirEnd, $fhLast+1)) !== false);
		
		
		// Find the central directory offset
		$offset = 0;
		if($last) {
			$endOfCentralDirectory = unpack('vNumberOfDisk/vNoOfDiskWithStartOfCentralDirectory/vNoOfCentralDirectoryEntriesOnDisk/vTotalCentralDirectoryEntries/VSizeOfCentralDirectory/VCentralDirectoryOffset/vCommentLength', substr($data, $last+4));
			$offset	= $endOfCentralDirectory['CentralDirectoryOffset'];
		}
		
		// Get details from Central directory structure.
		$fhStart = strpos($data, $this->_ctrlDirHeader, $offset);
		do {
			if (strlen($data) < $fhStart +31) {
				$this->set('error.message', 'Invalid ZIP data');
				return false;
			}
			$info = unpack('vMethod/VTime/VCRC32/VCompressed/VUncompressed/vLength', substr($data, $fhStart +10, 20));
			$name = substr($data, $fhStart +46, $info['Length']);

			$entries[$name] = array('attr' => null, 'crc' => sprintf("%08s", dechex($info['CRC32'] )), 'csize' => $info['Compressed'], 'date' => null, '_dataStart' => null, 'name' => $name, 'method' => $this->_methods[$info['Method']], '_method' => $info['Method'], 'size' => $info['Uncompressed'], 'type' => null);
			$entries[$name]['date'] = mktime((($info['Time'] >> 11) & 0x1f), (($info['Time'] >> 5) & 0x3f), (($info['Time'] << 1) & 0x3e), (($info['Time'] >> 21) & 0x07), (($info['Time'] >> 16) & 0x1f), ((($info['Time'] >> 25) & 0x7f) + 1980));

			if (strlen($data) < $fhStart +43) {
				$this->set('error.message', 'Invalid ZIP data');
				return false;
			}
			$info = unpack('vInternal/VExternal/VOffset', substr($data, $fhStart +36, 10));

			$entries[$name]['type'] = ($info['Internal'] & 0x01) ? 'text' : 'binary';
			$entries[$name]['attr'] = (($info['External'] & 0x10) ? 'D' : '-') .
									  (($info['External'] & 0x20) ? 'A' : '-') .
									  (($info['External'] & 0x03) ? 'S' : '-') .
									  (($info['External'] & 0x02) ? 'H' : '-') .
									  (($info['External'] & 0x01) ? 'R' : '-');
			$entries[$name]['offset'] = $info['Offset'];

			// Get details from local file header since we have the offset
			$lfhStart = strpos($data, $this->_fileHeader, $entries[$name]['offset']);
			if (strlen($data) < $lfhStart +34) {
				$this->set('error.message', 'Invalid ZIP data');
				return false;
			}
			$info = unpack('vMethod/VTime/VCRC32/VCompressed/VUncompressed/vLength/vExtraLength', substr($data, $lfhStart +8, 25));
			$name = substr($data, $lfhStart +30, $info['Length']);
			$entries[$name]['_dataStart'] = $lfhStart +30 + $info['Length'] + $info['ExtraLength'];
		} while ((($fhStart = strpos($data, $this->_ctrlDirHeader, $fhStart +46)) !== false));	

		$this->_metadata = array_values($entries);
		return true;
	}

	/**
	 * Returns the file data for a file by offsest in the ZIP archive
	 *
	 * @access	private
	 * @param	int		$key	The position of the file in the archive.
	 * @return	string	Uncompresed file data buffer
	 * @since	1.5
	 */
	function _getFileData($key) {
		if ($this->_metadata[$key]['_method'] == 0x8) {
			// If zlib extention is loaded use it
			if (extension_loaded('zlib')) {
				return @ gzinflate(substr($this->_data, $this->_metadata[$key]['_dataStart'], $this->_metadata[$key]['csize']));
			}
		}
		elseif ($this->_metadata[$key]['_method'] == 0x0) {
			/* Files that aren't compressed. */
			return substr($this->_data, $this->_metadata[$key]['_dataStart'], $this->_metadata[$key]['csize']);
		} elseif ($this->_metadata[$key]['_method'] == 0x12) {
			// Is bz2 extension loaded?  If not try to load it
			if (!extension_loaded('bz2')) {
				if (JPATH_ISWIN) {
					@ dl('php_bz2.dll');
				} else {
					@ dl('bz2.so');
				}
			}
			// If bz2 extention is sucessfully loaded use it
			if (extension_loaded('bz2')) {
				return bzdecompress(substr($this->_data, $this->_metadata[$key]['_dataStart'], $this->_metadata[$key]['csize']));
			}
		}
		return '';
	}

	/**
	 * Converts a UNIX timestamp to a 4-byte DOS date and time format
	 * (date in high 2-bytes, time in low 2-bytes allowing magnitude
	 * comparison).
	 *
	 * @access	private
	 * @param	int	$unixtime	The current UNIX timestamp.
	 * @return	int	The current date in a 4-byte DOS format.
	 * @since	1.5
	 */
	function _unix2DOSTime($unixtime = null) {
		$timearray = (is_null($unixtime)) ? 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 a "file" to the ZIP archive.
	 *
	 * @todo Review and finish implementation
	 *
	 * @access	private
	 * @param	array	$file		File data array to add
	 * @param	array	$contents	An array of existing zipped files.
	 * @param	array	$ctrldir	An array of central directory information.
	 * @return	void
	 * @since	1.5
	 */
	function _addToZIPFile(& $file, & $contents, & $ctrldir) {
		$data = & $file['data'];
		$name = str_replace('\\', '/', $file['name']);

		/* See if time/date information has been provided. */
		$ftime = null;
		if (isset ($file['time'])) {
			$ftime = $file['time'];
		}

		/* Get the hex time. */
		$dtime = dechex($this->_unix2DosTime($ftime));
		$hexdtime = chr(hexdec($dtime[6] . $dtime[7])) .
		chr(hexdec($dtime[4] . $dtime[5])) .
		chr(hexdec($dtime[2] . $dtime[3])) .
		chr(hexdec($dtime[0] . $dtime[1]));

		$fr = $this->_fileHeader; /* Begin creating the ZIP data. */
		$fr .= "\x14\x00"; /* Version needed to extract. */
		$fr .= "\x00\x00"; /* General purpose bit flag. */
		$fr .= "\x08\x00"; /* Compression method. */
		$fr .= $hexdtime; /* Last modification time/date. */

		/* "Local file header" segment. */
		$unc_len = strlen($data);
		$crc = crc32($data);
		$zdata = gzcompress($data);
		$zdata = substr(substr($zdata, 0, strlen($zdata) - 4), 2);
		$c_len = strlen($zdata);

		$fr .= pack('V', $crc); /* CRC 32 information. */
		$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 name. */

		/* "File data" segment. */
		$fr .= $zdata;

		/* Add this entry to array. */
		$old_offset = strlen(implode('', $contents));
		$contents[] = & $fr;

		/* Add to central directory record. */
		$cdrec = $this->_ctrlDirHeader;
		$cdrec .= "\x00\x00"; /* Version made by. */
		$cdrec .= "\x14\x00"; /* Version needed to extract */
		$cdrec .= "\x00\x00"; /* General purpose bit flag */
		$cdrec .= "\x08\x00"; /* Compression method */
		$cdrec .= $hexdtime; /* Last mod time/date. */
		$cdrec .= pack('V', $crc); /* CRC 32 information. */
		$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', $old_offset); /* Relative offset of local
		                                            header. */
		$cdrec .= $name; /* File name. */
		/* Optional extra field, file comment goes here. */

		// Save to central directory array. */
		$ctrldir[] = & $cdrec;
	}

	/**
	 * Creates the ZIP file.
	 * Official ZIP file format: http://www.pkware.com/appnote.txt
	 *
	 * @todo Review and finish implementation
	 *
	 * @access	private
	 * @param	array	$contents	An array of existing zipped files.
	 * @param	array	$ctrldir	An array of central directory information.
	 * @param	string	$path		The path to store the archive.
	 * @return	boolean	True if successful
	 * @since	1.5
	 */
	function _createZIPFile(& $contents, & $ctrlDir, $path)
	{
		$data = implode('', $contents);
		$dir = implode('', $ctrlDir);

		$buffer = $data . $dir . $this->_ctrlDirEnd .
		/* Total # of entries "on this disk". */
		pack('v', count($ctrlDir)) .
		/* Total # of entries overall. */
		pack('v', count($ctrlDir)) .
		/* Size of central directory. */
		pack('V', strlen($dir)) .
		/* Offset to start of central dir. */
		pack('V', strlen($data)) .
		/* ZIP file comment length. */
		"\x00\x00";

		if (JFile::write($path, $buffer) === false) {
			return false;
		} else {
			return true;
		}
	}
}