<?php
namespace PhpZip\Model\Extra\Fields;
use PhpZip\Exception\ZipException;
use PhpZip\Model\Extra\ZipExtraField;
use PhpZip\Model\ZipContainer;
use PhpZip\Model\ZipEntry;
/**
* Jar Marker Extra Field.
* An executable Java program can be packaged in a JAR file with all the libraries it uses.
* Executable JAR files can easily be distinguished from the files packed in the JAR file
* by the extra field in the first file, which is hexadecimal in the 0xCAFE bytes series.
* If this extra field is added as the very first extra field of
* the archive, Solaris will consider it an executable jar file.
*
* @license MIT
*/
class JarMarkerExtraField implements ZipExtraField
{
/** @var int Header id. */
const HEADER_ID = 0xCAFE;
/**
* @param ZipContainer $container
*/
public static function setJarMarker(ZipContainer $container)
{
$zipEntries = $container->getEntries();
if (!empty($zipEntries)) {
foreach ($zipEntries as $zipEntry) {
$zipEntry->removeExtraField(self::HEADER_ID);
}
// set jar execute bit
reset($zipEntries);
$zipEntry = current($zipEntries);
$zipEntry->getCdExtraFields()[] = new self();
}
}
/**
* Returns the Header ID (type) of this Extra Field.
* The Header ID is an unsigned short integer (two bytes)
* which must be constant during the life cycle of this object.
*
* @return int
*/
public function getHeaderId()
{
return self::HEADER_ID;
}
/**
* The actual data to put into local file data - without Header-ID
* or length specifier.
*
* @return string the data
*/
public function packLocalFileData()
{
return '';
}
/**
* The actual data to put into central directory - without Header-ID or
* length specifier.
*
* @return string the data
*/
public function packCentralDirData()
{
return '';
}
/**
* Populate data from this array as if it was in local file data.
*
* @param string $buffer the buffer to read data from
* @param ZipEntry|null $entry
*
* @throws ZipException on error
*
* @return JarMarkerExtraField
*/
public static function unpackLocalFileData($buffer, ZipEntry $entry = null)
{
if (!empty($buffer)) {
throw new ZipException("JarMarker doesn't expect any data");
}
return new self();
}
/**
* Populate data from this array as if it was in central directory data.
*
* @param string $buffer the buffer to read data from
* @param ZipEntry|null $entry
*
* @throws ZipException on error
*
* @return JarMarkerExtraField
*/
public static function unpackCentralDirData($buffer, ZipEntry $entry = null)
{
return self::unpackLocalFileData($buffer, $entry);
}
/**
* @return string
*/
public function __toString()
{
return sprintf('0x%04x Jar Marker', self::HEADER_ID);
}
}