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84 lines
2 KiB
PHP
84 lines
2 KiB
PHP
<?php
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/**
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* SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
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* SPDX-FileCopyrightText: 2016 ownCloud, Inc.
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* SPDX-License-Identifier: AGPL-3.0-only
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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 $limit
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* @return resource|false
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*/
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public static function wrap($stream, $limit) {
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$context = stream_context_create([
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'quota' => [
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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 - $offset;
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} elseif ($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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