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