138 lines
3 KiB
PHP
138 lines
3 KiB
PHP
<?php
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/**
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* Copyright (c) 2013 Robin Appelman <icewind@owncloud.com>
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* This file is licensed under the Affero General Public License version 3 or
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* later.
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* See the COPYING-README file.
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*/
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namespace OC\Files\Stream;
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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: void \OC\Files\Stream\Quota::register($id, $stream, $limit)
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* or: resource \OC\Files\Stream\Quota::wrap($stream, $limit)
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*/
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class Quota {
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private static $streams = array();
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/**
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* @var resource $source
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*/
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private $source;
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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 string $id
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* @param resource $stream
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* @param int $limit
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*/
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public static function register($id, $stream, $limit) {
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self::$streams[$id] = array($stream, $limit);
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}
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/**
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* remove all registered streams
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*/
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public static function clear() {
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self::$streams = array();
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}
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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, $limit) {
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$id = uniqid();
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self::register($id, $stream, $limit);
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$meta = stream_get_meta_data($stream);
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return fopen('quota://' . $id, $meta['mode']);
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}
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public function stream_open($path, $mode, $options, &$opened_path) {
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$id = substr($path, strlen('quota://'));
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if (isset(self::$streams[$id])) {
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list($this->source, $this->limit) = self::$streams[$id];
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return true;
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} else {
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return false;
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}
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}
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public function stream_seek($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 -= $offset;
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}
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return !fseek($this->source, $offset, $whence);
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}
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public function stream_tell() {
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return ftell($this->source);
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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, $data);
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}
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public function stream_set_option($option, $arg1, $arg2) {
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switch ($option) {
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case STREAM_OPTION_BLOCKING:
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stream_set_blocking($this->source, $arg1);
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break;
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case STREAM_OPTION_READ_TIMEOUT:
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stream_set_timeout($this->source, $arg1, $arg2);
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break;
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case STREAM_OPTION_WRITE_BUFFER:
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stream_set_write_buffer($this->source, $arg1, $arg2);
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}
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}
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public function stream_stat() {
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return fstat($this->source);
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}
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public function stream_lock($mode) {
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flock($this->source, $mode);
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}
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public function stream_flush() {
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return fflush($this->source);
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}
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public function stream_eof() {
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return feof($this->source);
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}
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public function stream_close() {
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fclose($this->source);
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}
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}
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