IPatchSupport.php
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IPatchSupport.php
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	<?php

	namespace Sabre\DAV\PartialUpdate;

	use Sabre\DAV;

	/**
	* This interface provides a way to modify only part of a target resource
	* It may be used to update a file chunk, upload big a file into smaller
	* chunks or resume an upload
	*
	* @copyright Copyright (C) 2007-2015 fruux GmbH (https://fruux.com/).
	* @author Jean-Tiare LE BIGOT (http://www.jtlebi.fr/)
	* @license http://sabre.io/license/ Modified BSD License
	*/
	interface IPatchSupport extends DAV\IFile {

	/**
	* Updates the file based on a range specification.
	*
	* The first argument is the data, which is either a readable stream
	* resource or a string.
	*
	* The second argument is the type of update we're doing.
	* This is either:
	* * 1. append
	* * 2. update based on a start byte
	* * 3. update based on an end byte
	*;
	* The third argument is the start or end byte.
	*
	* After a successful put operation, you may choose to return an ETag. The
	* etag must always be surrounded by double-quotes. These quotes must
	* appear in the actual string you're returning.
	*
	* Clients may use the ETag from a PUT request to later on make sure that
	* when they update the file, the contents haven't changed in the mean
	* time.
	*
	* @param resource\|string $data
	* @param int $rangeType
	* @param int $offset
	* @return string\|null
	*/
	function patch($data, $rangeType, $offset = null);

	}