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<?php
/**
* @version $Id: zip.php 6961 2007-03-15 16:06:53Z tcp $
* @package Joomla.Framework
* @subpackage FileSystem
* @copyright Copyright (C) 2005 - 2009 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE.txt
*/
// Check to ensure this file is within the rest of the framework
if( ! defined( '_JEXEC' ) && ! defined( '_VALID_MOS' ) )
die( 'Restricted access' ) ;
/**
* ZIP format adapter for the JArchive class
*
* The ZIP compression code is partially based on code from:
* Eric Mueller <eric@themepark.com>
* http://www.zend.com/codex.php?id=535&single=1
*
* Deins125 <webmaster@atlant.ru>
* http://www.zend.com/codex.php?id=470&single=1
*
* The ZIP compression date code is partially based on code from
* Peter Listiak <mlady@users.sourceforge.net>
*
* This class is inspired from and draws heavily in code and concept from the Compress package of
* The Horde Project <http://www.horde.org>
*
* @contributor Chuck Hagenbuch <chuck@horde.org>
* @contributor Michael Slusarz <slusarz@horde.org>
* @contributor Michael Cochrane <mike@graftonhall.co.nz>
*
* @package Joomla.Framework
* @subpackage FileSystem
* @since 1.5
*/
class extArchiveZip {
/**
* ZIP compression methods.
* @var array
*/
var $_methods = array (
0x0 => 'None',
0x1 => 'Shrunk',
0x2 => 'Super Fast',
0x3 => 'Fast',
0x4 => 'Normal',
0x5 => 'Maximum',
0x6 => 'Imploded',
0x8 => 'Deflated'
);
var $datasec = array(); // Compressed data
var $ctrl_dir = array(); // Central directory
var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00"; // EOF directory record
var $old_offset = 0; // Last offset position
/**
* Beginning of central directory record.
* @var string
*/
var $_ctrlDirHeader = "\x50\x4b\x01\x02";
/**
* End of central directory record.
* @var string
*/
var $_ctrlDirEnd = "\x50\x4b\x05\x06\x00\x00\x00\x00";
/**
* Beginning of file contents.
* @var string
*/
var $_fileHeader = "\x50\x4b\x03\x04";
/**
* ZIP file data buffer
* @var string
*/
var $_data = null;
/**
* ZIP file metadata array
* @var array
*/
var $_metadata = null;
/**
* Create a ZIP compressed file from an array of file data.
*
* @todo Finish Implementation
*
* @access public
* @param string $archive Path to save archive
* @param array $files Array of files to add to archive
* @param array $options Compression options [unused]
* @return boolean True if successful
* @since 1.5
*/
function create($archive, $files, $options = array ()) {
// Initialize variables
$contents = array();
$ctrldir = array();
$remove_path = '';
if( !empty($options['remove_path'])) {
$remove_path = $options['remove_path'];
}
$this->addFileList($files, $remove_path );
return $this->save($archive);
}
/**
* Extract a ZIP compressed file to a given path
*
* @access public
* @param string $archive Path to ZIP archive to extract
* @param string $destination Path to extract archive into
* @param array $options Extraction options [unused]
* @return boolean True if successful
* @since 1.5
*/
function extract( $archive, $destination, $options = array () ) {
if( ! is_file( $archive ) ) {
return PEAR::raiseError( 'Archive does not exist' ) ;
}
if( $this->hasNativeSupport() ) {
return $this->_extractNative( $archive, $destination, $options ) ;
} else {
return $this->_extract( $archive, $destination, $options ) ;
}
}
/**
* Method to determine if the server has native zip support for faster handling
*
* @access public
* @return boolean True if php has native ZIP support
* @since 1.5
*/
function hasNativeSupport() {
return (function_exists( 'zip_open' ) && function_exists( 'zip_read' )) ;
}
/**
* Checks to see if the data is a valid ZIP file.
*
* @access public
* @param string $data ZIP archive data buffer
* @return boolean True if valid, false if invalid.
* @since 1.5
*/
function checkZipData(& $data) {
if (strpos($data, $this->_fileHeader) === false) {
return false;
} else {
return true;
}
}
/**
* Extract a ZIP compressed file to a given path using a php based algorithm that only requires zlib support
*
* @access private
* @param string $archive Path to ZIP archive to extract
* @param string $destination Path to extract archive into
* @param array $options Extraction options [unused]
* @return boolean True if successful
* @since 1.5
*/
function _extract( $archive, $destination, $options ) {
// Initialize variables
$this->_data = null ;
$this->_metadata = null ;
if( ! extension_loaded( 'zlib' ) ) {
return PEAR::raiseError( 'Zlib Not Supported' ) ;
}
if( ! $this->_data = file_get_contents( $archive ) ) {
return PEAR::raiseError( 'Unable to read archive' ) ;
}
if( ! $this->_getZipInfo( $this->_data ) ) {
return false ;
}
for( $i = 0, $n = count( $this->_metadata ) ; $i < $n ; $i ++ ) {
if( substr( $this->_metadata[$i]['name'], - 1, 1 ) != '/' && substr( $this->_metadata[$i]['name'], - 1, 1 ) != '\\' ) {
$buffer = $this->_getFileData( $i ) ;
$path = extPath::clean( $destination . DS . $this->_metadata[$i]['name'] ) ;
if( strpos($path, '..') !== false ) {
return PEAR::raiseError( 'Use of relative paths not permitted' ) ;
}
// Make sure the destination folder exists
if( ! extMkdirR( dirname( $path ) ) ) {
return PEAR::raiseError( 'Unable to create destination' ) ;
}
if( file_put_contents( $path, $buffer ) === false ) {
return PEAR::raiseError( 'Unable to write entry' ) ;
}
}
}
return true;
}
/**
* Extract a ZIP compressed file to a given path using native php api calls for speed
*
* @access private
* @param string $archive Path to ZIP archive to extract
* @param string $destination Path to extract archive into
* @param array $options Extraction options [unused]
* @return boolean True if successful
* @since 1.5
*/
function _extractNative( $archive, $destination, $options ) {
$zip = zip_open( $archive );
if( is_resource( $zip ) ) {
// Make sure the destination folder exists
if( ! is_dir( $destination ) && ! mkdir( $destination ) ) {
return PEAR::raiseError( 'Unable to create destination' ) ;
}
// Read files in the archive
while( $file = @zip_read( $zip ) ) {
if( zip_entry_open( $zip, $file, "r" ) ) {
if( substr( zip_entry_name( $file ), strlen( zip_entry_name( $file ) ) - 1 ) != "/" ) {
$buffer = zip_entry_read( $file, zip_entry_filesize( $file ) ) ;
if( strpos($destination . DS . zip_entry_name( $file ), '..') !== false ) {
return PEAR::raiseError( 'Use of relative paths not permitted' ) ;
}
if( !extMkdirR(dirname($destination . DS . zip_entry_name( $file ))) || file_put_contents( $destination . DS . zip_entry_name( $file ), $buffer ) === false ) {
return PEAR::raiseError( 'Unable to write entry: '.$destination . DS. zip_entry_name( $file ) ) ;
}
zip_entry_close( $file ) ;
}
} else {
return PEAR::raiseError( 'Unable to read entry' ) ;
}
}
@zip_close( $zip ) ;
} else {
return PEAR::raiseError( "Unable to open archive: ".extArchiveZip::zipFileErrMsg($zip) ) ;
}
return true ;
}
/**
* 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 ) {
return PEAR::raiseError( 'Invalid ZIP data' ) ;
}
$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 ) {
return PEAR::raiseError( 'Invalid ZIP data' ) ;
}
$info = unpack('vInternal/VExternal/VOffset', substr($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) {
return PEAR::raiseError( 'Invalid ZIP data' ) ;
}
$info = unpack('vMethod/VTime/VCRC32/VCompressed/VUncompressed/vLength/vExtraLength', substr($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( ext_isWindows() ) {
@ 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) | ($timearray['seconds'] >> 1) ;
}
function add_data($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)
$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;
$new_offset = strlen(implode('', $this->datasec));
// 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 = $new_offset;
$cdrec .= $name;
// optional extra field, file comment goes here
// save to central directory
$this->ctrl_dir[] = $cdrec;
}
function contents() {
$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
}
function addFileList( $filelist, $removePath ) {
foreach( $filelist as $file ) {
$data = file_get_contents( $file );
if( empty( $data )) continue;
$cleaned_file = str_replace( $removePath. DIRECTORY_SEPARATOR, '', $file );
$cleaned_file = str_replace( $removePath, '', $cleaned_file );
$this->add_data($data, $cleaned_file, filemtime($file));
}
return true;
}
//------------------------------------------------------------------------------
// File functions
function add($dir, $name) {
$item=$dir."/".$name;
if(@is_file($item)) {
if(($fp=fopen($item,"rb"))===false) return false;
$item_size = filesize($item);
if( $item_size == 0 ) {
return true;
}
$data=fread($fp, $item_size);
fclose($fp);
$this->add_data($data,$name,filemtime($item));
return true;
} elseif(@is_dir($item)) {
if(($handle=opendir($item))===false) return false;
while(($file=readdir($handle))!==false) {
if(($file==".." || $file==".")) continue;
if(!$this->add($dir,$name."/".$file)) return false;
}
closedir($handle);
return true;
}
return false;
}
function save($name) {
$result = file_put_contents($name, $this->contents());
return $result;
}
function zipFileErrMsg($errno) {
// using constant name as a string to make this function PHP4 compatible
$zipFileFunctionsErrors = array(
'ZIPARCHIVE::ER_MULTIDISK' => 'Multi-disk zip archives not supported.',
'ZIPARCHIVE::ER_RENAME' => 'Renaming temporary file failed.',
'ZIPARCHIVE::ER_CLOSE' => 'Closing zip archive failed',
'ZIPARCHIVE::ER_SEEK' => 'Seek error',
'ZIPARCHIVE::ER_READ' => 'Read error',
'ZIPARCHIVE::ER_WRITE' => 'Write error',
'ZIPARCHIVE::ER_CRC' => 'CRC error',
'ZIPARCHIVE::ER_ZIPCLOSED' => 'Containing zip archive was closed',
'ZIPARCHIVE::ER_NOENT' => 'No such file.',
'ZIPARCHIVE::ER_EXISTS' => 'File already exists',
'ZIPARCHIVE::ER_OPEN' => 'Can\'t open file',
'ZIPARCHIVE::ER_TMPOPEN' => 'Failure to create temporary file.',
'ZIPARCHIVE::ER_ZLIB' => 'Zlib error',
'ZIPARCHIVE::ER_MEMORY' => 'Memory allocation failure',
'ZIPARCHIVE::ER_CHANGED' => 'Entry has been changed',
'ZIPARCHIVE::ER_COMPNOTSUPP' => 'Compression method not supported.',
'ZIPARCHIVE::ER_EOF' => 'Premature EOF',
'ZIPARCHIVE::ER_INVAL' => 'Invalid argument',
'ZIPARCHIVE::ER_NOZIP' => 'Not a zip archive',
'ZIPARCHIVE::ER_INTERNAL' => 'Internal error',
'ZIPARCHIVE::ER_INCONS' => 'Zip archive inconsistent',
'ZIPARCHIVE::ER_REMOVE' => 'Can\'t remove file',
'ZIPARCHIVE::ER_DELETED' => 'Entry has been deleted',
);
foreach ($zipFileFunctionsErrors as $constName => $errorMessage) {
if (defined($constName) and constant($constName) === $errno) {
return 'Zip File Function error: '.$errorMessage;
}
}
return 'Zip File Function error: unknown';
}
}