Your IP : 172.28.240.42
<?php
// Protect from direct execution
defined('_JEXEC') or die('Restricted Access');
class CSimpleUnzip extends UnarchiverParent
{
/**
* Extracts a file from the ZIP archive
*
* @param integer $offset The offset to start extracting from. If ommited, or set to null,
* it continues from the ZIP file's current location.
* @return array|boolean A return array or FALSE if an error occured
*/
function Extract( $offset = null )
{
global $ftp;
// This flag is set to true when a "banned" filename is detected
$isBannedFile = false;
// Generate a return array
$retArray = array(
"file" => '', // File name extracted
"compressed" => 0, // Compressed size
"uncompressed" => 0, // Uncompressed size
"type" => "file", // File type (file | dir | link)
"offset" => 0, // Offset in ZIP file
"done" => false // Are we done with extracting files?
);
if( is_null($offset) ) $offset = 0;
$this->_skipToOffset($offset);
// Get and decode Local File Header
$headerBinary = fread($this->_fp, 30);
$headerData = unpack('Vsig/C2ver/vbitflag/vcompmethod/vlastmodtime/vlastmoddate/Vcrc/Vcompsize/Vuncomp/vfnamelen/veflen', $headerBinary);
// If the signature is
$multiPartSigs = array( 0x08074b50, 0x30304b50 );
if( in_array($headerData['sig'], $multiPartSigs) )
{
// Skip four bytes ahead and re-read the header
$this->_skipToOffset($offset + 4);
$headerBinary = fread($this->_fp, 30);
$headerData = unpack('Vsig/C2ver/vbitflag/vcompmethod/vlastmodtime/vlastmoddate/Vcrc/Vcompsize/Vuncomp/vfnamelen/veflen', $headerBinary);
}
if( $headerData['sig'] == 0x04034b50 )
{
// This is a file header. Get basic parameters.
$retArray['compressed'] = $headerData['compsize'];
$retArray['uncompressed'] = $headerData['uncomp'];
$nameFieldLength = $headerData['fnamelen'];
$extraFieldLength = $headerData['eflen'];
// Read filename field
$retArray['file'] = fread( $this->_fp, $nameFieldLength );
// Handle file renaming
if(is_array($this->_renameFiles) && (count($this->_renameFiles) > 0) )
{
if(array_key_exists($retArray['file'], $this->_renameFiles))
{
$retArray['file'] = $this->_renameFiles[$retArray['file']];
}
}
// Read extra field if present
if($extraFieldLength > 0) $extrafield = fread( $this->_fp, $extraFieldLength );
// Decide filetype -- Check for directories
if( strrpos($retArray['file'], '/') == strlen($retArray['file']) - 1 ) $retArray['type'] = 'dir';
// Decide filetype -- Check for symbolic links
if( ($headerData['ver1'] == 10) && ($headerData['ver2'] == 3) ) $retArray['type'] = 'link';
// Do we need to create the directory?
if(strpos($retArray['file'], '/') !== false) {
$lastSlash = strrpos($retArray['file'], '/');
$dirName = substr( $retArray['file'], 0, $lastSlash);
if(!$this->_flagUseFTP)
{
if( $this->_createDirRecursive($dirName) == false ) {
$this->_isError = true;
if($this->_flagTranslate)
{
$this->_error = JText::sprintf('COULDNT_CREATE_DIR', $dirName);
}
else
{
$this->_error = 'Could not create directory '.$dirName;
}
return false;
}
}
else
{
if( $this->_ftp->makeDirectory($dirName) == false ) {
$this->_isError = true;
if($this->_flagTranslate)
{
$this->_error = JText::sprintf('COULDNT_CREATE_DIR', $dirName);
}
else
{
$this->_error = 'Could not create directory '.$dirName;
}
return false;
}
}
}
// Find hard-coded banned files (. and .. MUST NOT be attempted to be restored!)
if( (basename($retArray['file']) == ".") || (basename($retArray['file']) == "..") )
{
$isBannedFile = true;
}
// Also try to find banned files passed in class configuration
if(count($this->_skipFiles) > 0)
{
if(in_array($retArray['file'], $this->_skipFiles))
{
$isBannedFile = true;
}
}
// If we have a banned file, let's skip it
if($isBannedFile)
{
$retArray['offset'] = $this->_getOffset() + $retArray['uncompressed'];
return $retArray;
}
// Last chance to prepend a path to the filename
if(!empty($this->_addPath))
{
$last_addpath_char = substr($this->_addPath, -1);
if( ($last_addpath_char == '\\') || $last_addpath_char == '/' )
{
$this->_addPath = substr($this->_addPath, 0, -1);
}
$retArray['file'] = $this->_addPath.'/'.$retArray['file'];
}
if( $headerData['compmethod'] == 8 )
{
// DEFLATE compression
$zipData = fread( $this->_fp, $retArray['compressed'] );
while( strlen($zipData) < $retArray['compressed'] )
{
// End of local file before reading all data, but have more archive parts?
if($this->_isEOF(true) && !$this->_isEOF(false))
{
// Yeap. Read from the next file
$this->_getNextFile();
$bytes_left = $retArray['compressed'] - strlen($zipData);
$zipData .= fread( $this->_fp, $bytes_left );
}
else
{
// Crap... this archive is corrupt
// @todo Translate!
$this->_error = 'Corrupt archive detected; can\'t continue';
return false;
}
}
$unzipData = gzinflate( $zipData );
unset($zipData);
// Try writing to the output file
if(!$this->_flagUseFTP)
{
$outfp = @fopen( $retArray['file'], 'w' );
}
else
{
$tmpLocal = tempnam(TEMPDIR,'jpks');
$outfp = @fopen( $tmpLocal, 'w' );
}
if( $outfp === false ) {
// An error occured
$this->_isError = true;
// @todo Translate!
$this->_error = "Could not open " . $retArray['file'] . " for writing.";
return false;
} else {
// No error occured. Write to the file.
fwrite( $outfp, $unzipData, $retArray['uncompressed'] );
fclose( $outfp );
if($this->_flagUseFTP)
{
$this->_ftp->uploadAndDelete($retArray['file'], $tmpLocal);
}
else
{
// Try to change file permissions to 0755
@chmod($retArray['file'], 0755);
}
}
unset($unzipData);
}
else
{
// Uncompressed data. Action depends on what type it is
if( $retArray['type'] == "file" )
{
// No compression
if( $retArray['uncompressed'] > 0 )
{
if(!$this->_flagUseFTP)
{
$outfp = @fopen( $retArray['file'], 'w' );
}
else
{
$tmpLocal = tempnam(TEMPDIR,'jpks');
$outfp = @fopen( $tmpLocal, 'w' );
}
if( $outfp === false ) {
// An error occured
$this->_isError = true;
if($this->_flagTranslate)
{
$this->_error = JText::sprintf('COULDNT_WRITE_FILE', $retArray['file']);
}
else
{
$this->_error = 'Could not write to file '.$retArray['file'];
}
return false;
} else {
$readBytes = 0;
$toReadBytes = 0;
$leftBytes = $retArray['compressed'];
while( $leftBytes > 0)
{
$toReadBytes = ($leftBytes > $this->_chunkSize) ? $this->_chunkSize : $leftBytes;
$data = fread( $this->_fp, $toReadBytes );
$reallyReadBytes = strlen($data);
$leftBytes -= $reallyReadBytes;
if($reallyReadBytes < $toReadBytes)
{
// We read less than requested! Why? Did we hit local EOF?
if( $this->_isEOF(true) && !$this->_isEOF(false) )
{
// Yeap. Let's go to the next file
$this->_getNextFile();
}
else
{
// Nope. The archive is corrupt
// @todo Translate!
$this->_error = 'Corrupt archive detected; can\'t continue';
return false;
}
}
fwrite( $outfp, $data );
}
fclose($outfp);
if($this->_flagUseFTP)
{
$this->_ftp->uploadAndDelete($retArray['file'], $tmpLocal);
}
else
{
// Try to change file permissions to 0755
@chmod($retArray['file'], 0755);
}
}
} else {
// 0 byte file, just touch it
if(!$this->_flagUseFTP)
{
$outfp = @fopen( $retArray['file'], 'w' );
}
else
{
$tmpLocal = tempnam(TEMPDIR,'jpks');
$outfp = @fopen( $tmpLocal, 'w' );
}
if( $outfp === false ) {
// An error occured
$this->_isError = true;
if($this->_flagTranslate)
{
$this->_error = Text::sprintf('COULDNT_WRITE_FILE', $retArray['file']);
}
else
{
$this->_error = 'Could not write to file '.$retArray['file'];
}
return false;
} else {
fclose($outfp);
if($this->_flagUseFTP)
{
$ftp->uploadAndDelete($retArray['file'], $tmpLocal);
}
else
{
// Try to change file permissions to 0755
@chmod($retArray['file'], 0755);
}
}
}
} else if( $retArray['type'] == "dir" ) {
// Directory entry
if(!$this->_flagUseFTP)
{
$result = $this->_createDirRecursive($dirName);
}
else
{
$result = $this->_ftp->makeDirectory($dirName);
}
if( !$result ) {
return false;
}
} else if( $retArray['type'] == "link" ) {
// Symbolic link
$readBytes = 0;
$toReadBytes = 0;
$leftBytes = $retArray['compressed'];
$data = '';
while( $leftBytes > 0)
{
$toReadBytes = ($leftBytes > $this->_chunkSize) ? $this->_chunkSize : $leftBytes;
$data .= fread( $this->_fp, $toReadBytes );
$reallyReadBytes = strlen($data);
$leftBytes -= $reallyReadBytes;
if($reallyReadBytes < $toReadBytes)
{
// We read less than requested! Why? Did we hit local EOF?
if( $this->_isEOF(true) && !$this->_isEOF(false) )
{
// Yeap. Let's go to the next file
$this->_getNextFile();
}
else
{
// Nope. The archive is corrupt
// @todo Translate!
$this->_error = 'Corrupt archive detected; can\'t continue';
return false;
}
}
}
// Try to remove an existing file or directory by the same name
if(file_exists($retArray['file'])) { @unlink($retArray['file']); @rmdir($retArray['file']); }
// Remove any trailing slash
if(substr($retArray['file'], -1) == '/') $retArray['file'] = substr($retArray['file'], 0, -1);
// Create the symlink
@symlink($data, $retArray['file']);
}
}
$retArray['offset'] = $this->_getOffset();
return $retArray;
} else {
// This is not a file header. This means we are done.
$retArray['done'] = true;
return $retArray;
}
}
}
?>