<?php
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namespace PhpZip\Model\Extra;
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use PhpZip\Model\ZipEntry;
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/**
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* Extra Field in a Local or Central Header of a ZIP archive.
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* It defines the common properties of all Extra Fields and how to
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* serialize/unserialize them to/from byte arrays.
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*/
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interface ZipExtraField
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{
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/**
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* Returns the Header ID (type) of this Extra Field.
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* The Header ID is an unsigned short integer (two bytes)
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* which must be constant during the life cycle of this object.
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*
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* @return int
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*/
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public function getHeaderId();
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/**
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* Populate data from this array as if it was in local file data.
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*
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* @param string $buffer the buffer to read data from
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* @param ZipEntry|null $entry
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*
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* @return static
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*/
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public static function unpackLocalFileData($buffer, ZipEntry $entry = null);
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/**
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* Populate data from this array as if it was in central directory data.
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*
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* @param string $buffer the buffer to read data from
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* @param ZipEntry|null $entry
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*
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* @return static
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*/
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public static function unpackCentralDirData($buffer, ZipEntry $entry = null);
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/**
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* The actual data to put into local file data - without Header-ID
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* or length specifier.
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*
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* @return string the data
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*/
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public function packLocalFileData();
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/**
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* The actual data to put into central directory - without Header-ID or
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* length specifier.
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*
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* @return string the data
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*/
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public function packCentralDirData();
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/**
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* @return string
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*/
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public function __toString();
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}
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