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| <?php
/**
* Class to dynamically create a zip file (archive) of file(s) and/or directory
*
* @author Rochak Chauhan www.rochakchauhan.com
* @package CreateZipFile
* @see Distributed under "General Public License"
*
* @version 1.0
*/
class CreateZipFile {
public $compressedData = array();
public $centralDirectory = array(); // central directory
public $endOfCentralDirectory = "\x50\x4b\x05\x06\x00\x00\x00\x00"; //end of Central directory record
public $oldOffset = 0;
/**
* Function to create the directory where the file(s) will be unzipped
*
* @param string $directoryName
* @access public
* @return void
*/
public function addDirectory($directoryName) {
$directoryName = str_replace("\\", "/", $directoryName);
$feedArrayRow = "\x50\x4b\x03\x04";
$feedArrayRow .= "\x0a\x00";
$feedArrayRow .= "\x00\x00";
$feedArrayRow .= "\x00\x00";
$feedArrayRow .= "\x00\x00\x00\x00";
$feedArrayRow .= pack("V",0);
$feedArrayRow .= pack("V",0);
$feedArrayRow .= pack("V",0);
$feedArrayRow .= pack("v", strlen($directoryName) );
$feedArrayRow .= pack("v", 0 );
$feedArrayRow .= $directoryName;
$feedArrayRow .= pack("V",0);
$feedArrayRow .= pack("V",0);
$feedArrayRow .= pack("V",0);
$this->compressedData[] = $feedArrayRow;
$newOffset = strlen(implode("", $this->compressedData));
$addCentralRecord = "\x50\x4b\x01\x02";
$addCentralRecord .="\x00\x00";
$addCentralRecord .="\x0a\x00";
$addCentralRecord .="\x00\x00";
$addCentralRecord .="\x00\x00";
$addCentralRecord .="\x00\x00\x00\x00";
$addCentralRecord .= pack("V",0);
$addCentralRecord .= pack("V",0);
$addCentralRecord .= pack("V",0);
$addCentralRecord .= pack("v", strlen($directoryName) );
$addCentralRecord .= pack("v", 0 );
$addCentralRecord .= pack("v", 0 );
$addCentralRecord .= pack("v", 0 );
$addCentralRecord .= pack("v", 0 );
$addCentralRecord .= pack("V", 16 );
$addCentralRecord .= pack("V", $this->oldOffset );
$this->oldOffset = $newOffset;
$addCentralRecord .= $directoryName;
$this->centralDirectory[] = $addCentralRecord;
}
/**
* Function to add file(s) to the specified directory in the archive
*
* @param string $directoryName
* @param string $data
* @return void
* @access public
*/
public function addFile($data, $directoryName) {
$directoryName = str_replace("\\", "/", $directoryName);
$feedArrayRow = "\x50\x4b\x03\x04";
$feedArrayRow .= "\x14\x00";
$feedArrayRow .= "\x00\x00";
$feedArrayRow .= "\x08\x00";
$feedArrayRow .= "\x00\x00\x00\x00";
$uncompressedLength = strlen($data);
$compression = crc32($data);
$gzCompressedData = gzcompress($data);
$gzCompressedData = substr( substr($gzCompressedData, 0, strlen($gzCompressedData) - 4), 2);
$compressedLength = strlen($gzCompressedData);
$feedArrayRow .= pack("V",$compression);
$feedArrayRow .= pack("V",$compressedLength);
$feedArrayRow .= pack("V",$uncompressedLength);
$feedArrayRow .= pack("v", strlen($directoryName) );
$feedArrayRow .= pack("v", 0 );
$feedArrayRow .= $directoryName;
$feedArrayRow .= $gzCompressedData;
$feedArrayRow .= pack("V",$compression);
$feedArrayRow .= pack("V",$compressedLength);
$feedArrayRow .= pack("V",$uncompressedLength);
$this->compressedData[] = $feedArrayRow;
$newOffset = strlen(implode("", $this->compressedData));
$addCentralRecord = "\x50\x4b\x01\x02";
$addCentralRecord .="\x00\x00";
$addCentralRecord .="\x14\x00";
$addCentralRecord .="\x00\x00";
$addCentralRecord .="\x08\x00";
$addCentralRecord .="\x00\x00\x00\x00";
$addCentralRecord .= pack("V",$compression);
$addCentralRecord .= pack("V",$compressedLength);
$addCentralRecord .= pack("V",$uncompressedLength);
$addCentralRecord .= pack("v", strlen($directoryName) );
$addCentralRecord .= pack("v", 0 );
$addCentralRecord .= pack("v", 0 );
$addCentralRecord .= pack("v", 0 );
$addCentralRecord .= pack("v", 0 );
$addCentralRecord .= pack("V", 32 );
$addCentralRecord .= pack("V", $this->oldOffset );
$this->oldOffset = $newOffset;
$addCentralRecord .= $directoryName;
$this->centralDirectory[] = $addCentralRecord;
}
/**
* Function to return the zip file
*
* @return zipfile (archive)
* @access public
* @return void
*/
public function getZippedfile() {
$data = implode("", $this->compressedData);
$controlDirectory = implode("", $this->centralDirectory);
return
$data.
$controlDirectory.
$this->endOfCentralDirectory.
pack("v", sizeof($this->centralDirectory)).
pack("v", sizeof($this->centralDirectory)).
pack("V", strlen($controlDirectory)).
pack("V", strlen($data)).
"\x00\x00";
}
/**
*
* Function to force the download of the archive as soon as it is created
*
* @param archiveName string - name of the created archive file
* @access public
* @return ZipFile via Header
*/
public function forceDownload($archiveName) {
if(ini_get('zlib.output_compression')) {
ini_set('zlib.output_compression', 'Off');
}
// Security checks
if( $archiveName == "" ) {
echo "<html><title>Public Photo Directory - Download </title><body><BR><B>ERROR:</B> The download file was NOT SPECIFIED.</body></html>";
exit;
}
elseif ( ! file_exists( $archiveName ) ) {
echo "<html><title>Public Photo Directory - Download </title><body><BR><B>ERROR:</B> File not found.</body></html>";
exit;
}
header("Pragma: public");
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Cache-Control: private",false);
header("Content-Type: application/zip");
header("Content-Disposition: attachment; filename=".basename($archiveName).";" );
header("Content-Transfer-Encoding: binary");
header("Content-Length: ".filesize($archiveName));
readfile("$archiveName");
}
/**
* Function to parse a directory to return all its files and sub directories as array
*
* @param string $dir
* @access protected
* @return array
*/
protected function parseDirectory($rootPath, $seperator="/"){
$fileArray=array();
$handle = opendir($rootPath);
while( ($file = @readdir($handle))!==false) {
if($file !='.' && $file !='..'){
if (is_dir($rootPath.$seperator.$file)){
$array=$this->parseDirectory($rootPath.$seperator.$file);
$fileArray=array_merge($array,$fileArray);
}
else {
$fileArray[]=$rootPath.$seperator.$file;
}
}
}
return $fileArray;
}
/**
* Function to Zip entire directory with all its files and subdirectories
*
* @param string $dirName
* @access public
* @return void
*/
public function zipDirectory($dirName, $outputDir) {
if (!is_dir($dirName)){
trigger_error("CreateZipFile FATAL ERROR: Could not locate the specified directory $dirName", E_USER_ERROR);
}
$tmp=$this->parseDirectory($dirName);
$count=count($tmp);
$this->addDirectory($outputDir);
for ($i=0;$i<$count;$i++){
$fileToZip=trim($tmp[$i]);
$newOutputDir=substr($fileToZip,0,(strrpos($fileToZip,'/')+1));
$outputDir=$outputDir.$newOutputDir;
$fileContents=file_get_contents($fileToZip);
$this->addFile($fileContents,$fileToZip);
}
}
}
?> |
