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<?php
namespace PhpZip\Extra\Fields;
use PhpZip\Exception\ZipException;
use PhpZip\Extra\ExtraField;
/**
* 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.
*
* @author Ne-Lexa alexey@nelexa.ru
* @license MIT
*/
class JarMarkerExtraField implements ExtraField
{
/**
* 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 static function getHeaderId()
{
return 0xCAFE;
}
/**
* Serializes a Data Block.
* @return string
*/
public function serialize()
{
return '';
}
/**
* Initializes this Extra Field by deserializing a Data Block.
* @param string $data
* @throws ZipException
*/
public function deserialize($data)
{
if (0 !== strlen($data)) {
throw new ZipException("JarMarker doesn't expect any data");
}
}
}
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