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<?php
/**
* Class to dynamically create a zip file (archive)
*
* @author Rochak Chauhan. Extended by Joel Wan & Mark Slemko
*/
class createZip {
var $compressedData = array();
var $centralDirectory = array(); // central directory
var $endOfCentralDirectory = "\x50\x4b\x05\x06\x00\x00\x00\x00"; //end of Central directory record
var $oldOffset = 0;
/**
* Function to create the directory where the file(s) will be unzipped
*
* @param $directoryName string
*
*/
function addDirectory($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 );
$ext = "\x00\x00\x10\x00";
$ext = "\xff\xff\xff\xff";
$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 $directoryName string
*
*/
function addFile($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;
}
/**
* Fucntion to return the zip file
*
* @return zipfile (archive)
*/
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($data)).
"\x00\x00";
}
/**
*
* Function to force the download of the archive as soon as it is created
*
* @param archiveName string - name of the created archive file
*/
function forceDownload($archiveName) {
$headerInfo = '';
header("Pragma: public");
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Cache-Control: private",false);
header("Content-Type: application/zip");
header("Content-Disposition: attachment; filename=".basename($archiveName).";" );
header("Content-Transfer-Encoding: binary");
echo $this->getZippedfile();
}
/**
* Generates zip file from POG package.
*
* @param multi-d array $package
* @param array $paths
*/
function addPOGPackage($package, $paths=array())
{
$i = 0;
foreach ($package as $key=>$value)
{
$path = '';
foreach ($paths as $p)
{
$path .= (($path == '') ? $p : "/$p");
}
if (strpos($key, ".") == false)
{
$paths[] = $key;
$this->addDirectory((($path == '') ? "$key/" : "$path/$key/"));
$this->addPOGPackage($package[$key], &$paths);
}
else
{
$this->addFile(base64_decode($value), (($path == '') ? $key : "$path/$key"));
}
if ($i == (sizeof($package)-1))
{
array_pop($paths);
}
$i++;
}
}
}
?>
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