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<?php
/**
* Copyright (c) 2014 Robin Appelman <icewind@owncloud.com>
* This file is licensed under the Licensed under the MIT license:
* http://opensource.org/licenses/MIT
*/
namespace Icewind\SMB\Native;
use Icewind\SMB\StringBuffer;
/**
* Stream optimized for read only usage
*/
class NativeReadStream extends NativeStream {
const CHUNK_SIZE = 1048576; // 1MB chunks
/** @var StringBuffer */
private $readBuffer;
public function __construct() {
$this->readBuffer = new StringBuffer();
}
/** @var int */
private $pos = 0;
public function stream_open($path, $mode, $options, &$opened_path) {
return parent::stream_open($path, $mode, $options, $opened_path);
}
/**
* Wrap a stream from libsmbclient-php into a regular php stream
*
* @param NativeState $state
* @param resource $smbStream
* @param string $mode
* @param string $url
* @return resource
*/
public static function wrap(NativeState $state, $smbStream, string $mode, string $url) {
return parent::wrapClass($state, $smbStream, $mode, $url, NativeReadStream::class);
}
public function stream_read($count) {
// php reads 8192 bytes at once
// however due to network latency etc, it's faster to read in larger chunks
// and buffer the result
if (!parent::stream_eof() && $this->readBuffer->remaining() < $count) {
$chunk = parent::stream_read(self::CHUNK_SIZE);
if ($chunk === false) {
return false;
}
$this->readBuffer->push($chunk);
}
$result = $this->readBuffer->read($count);
$read = strlen($result);
$this->pos += $read;
return $result;
}
public function stream_seek($offset, $whence = SEEK_SET) {
$result = parent::stream_seek($offset, $whence);
if ($result) {
$this->readBuffer->clear();
$pos = parent::stream_tell();
if ($pos === false) {
return false;
}
$this->pos = $pos;
}
return $result;
}
public function stream_eof() {
return $this->readBuffer->remaining() <= 0 && parent::stream_eof();
}
public function stream_tell() {
return $this->pos;
}
public function stream_write($data) {
return false;
}
public function stream_truncate($size) {
return false;
}
}
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