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- <?php
- /**
- * @copyright Copyright (c) 2016, ownCloud, Inc.
- *
- * @author Jörn Friedrich Dreyer <jfd@butonic.de>
- * @author Morris Jobke <hey@morrisjobke.de>
- * @author Robin Appelman <robin@icewind.nl>
- * @author Vincent Petry <pvince81@owncloud.com>
- *
- * @license AGPL-3.0
- *
- * This code is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License, version 3,
- * as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License, version 3,
- * along with this program. If not, see <http://www.gnu.org/licenses/>
- *
- */
- namespace OC\Files\Stream;
- use Icewind\Streams\Wrapper;
- /**
- * stream wrapper limits the amount of data that can be written to a stream
- *
- * usage: resource \OC\Files\Stream\Quota::wrap($stream, $limit)
- */
- class Quota extends Wrapper {
- /**
- * @var int $limit
- */
- private $limit;
- /**
- * @param resource $stream
- * @param int $limit
- * @return resource
- */
- static public function wrap($stream, $limit) {
- $context = stream_context_create(array(
- 'quota' => array(
- 'source' => $stream,
- 'limit' => $limit
- )
- ));
- return Wrapper::wrapSource($stream, $context, 'quota', self::class);
- }
- public function stream_open($path, $mode, $options, &$opened_path) {
- $context = $this->loadContext('quota');
- $this->source = $context['source'];
- $this->limit = $context['limit'];
- return true;
- }
- public function dir_opendir($path, $options) {
- return false;
- }
- public function stream_seek($offset, $whence = SEEK_SET) {
- if ($whence === SEEK_END){
- // go to the end to find out last position's offset
- $oldOffset = $this->stream_tell();
- if (fseek($this->source, 0, $whence) !== 0){
- return false;
- }
- $whence = SEEK_SET;
- $offset = $this->stream_tell() + $offset;
- $this->limit += $oldOffset - $offset;
- }
- else if ($whence === SEEK_SET) {
- $this->limit += $this->stream_tell() - $offset;
- } else {
- $this->limit -= $offset;
- }
- // this wrapper needs to return "true" for success.
- // the fseek call itself returns 0 on succeess
- return fseek($this->source, $offset, $whence) === 0;
- }
- public function stream_read($count) {
- $this->limit -= $count;
- return fread($this->source, $count);
- }
- public function stream_write($data) {
- $size = strlen($data);
- if ($size > $this->limit) {
- $data = substr($data, 0, $this->limit);
- $size = $this->limit;
- }
- $this->limit -= $size;
- return fwrite($this->source, $data);
- }
- }
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