<?php
namespace PhpZip\Model\Extra;
use PhpZip\Model\ZipEntry;
/**
* Extra Field in a Local or Central Header of a ZIP archive.
* It defines the common properties of all Extra Fields and how to
* serialize/unserialize them to/from byte arrays.
*/
interface ZipExtraField
{
/**
* 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();
/**
* 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 $entry
*
* @return static
*/
public static function unpackLocalFileData($buffer, ZipEntry $entry = null);
/**
* 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 $entry
*
* @return static
*/
public static function unpackCentralDirData($buffer, ZipEntry $entry = null);
/**
* The actual data to put into local file data - without Header-ID
* or length specifier.
*
* @return string the data
*/
public function packLocalFileData();
/**
* The actual data to put into central directory - without Header-ID or
* length specifier.
*
* @return string the data
*/
public function packCentralDirData();
/**
* @return string
*/
public function __toString();
}