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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;
/**
* Stream optimized for read only usage
*/
class NativeReadStream extends NativeStream {
const CHUNK_SIZE = 1048576; // 1MB chunks
/**
* @var resource
*/
private $readBuffer = null;
private $bufferSize = 0;
private $pos = 0;
public function stream_open($path, $mode, $options, &$opened_path) {
$this->readBuffer = fopen('php://memory', 'r+');
return parent::stream_open($path, $mode, $options, $opened_path);
}
/**
* Wrap a stream from libsmbclient-php into a regular php stream
*
* @param \Icewind\SMB\NativeState $state
* @param resource $smbStream
* @param string $mode
* @param string $url
* @return resource
*/
public static function wrap($state, $smbStream, $mode, $url) {
stream_wrapper_register('nativesmb', '\Icewind\SMB\NativeReadStream');
$context = stream_context_create(array(
'nativesmb' => array(
'state' => $state,
'handle' => $smbStream,
'url' => $url
)
));
$fh = fopen('nativesmb://', $mode, false, $context);
stream_wrapper_unregister('nativesmb');
return $fh;
}
public function stream_read($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->bufferSize < $count) {
$remaining = $this->readBuffer;
$this->readBuffer = fopen('php://memory', 'r+');
$this->bufferSize = 0;
stream_copy_to_stream($remaining, $this->readBuffer);
$this->bufferSize += fwrite($this->readBuffer, parent::stream_read(self::CHUNK_SIZE));
fseek($this->readBuffer, 0);
}
$result = fread($this->readBuffer, $count);
$this->bufferSize -= $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 = fopen('php://memory', 'r+');
$this->bufferSize = 0;
$this->pos = parent::stream_tell();
}
return $result;
}
public function stream_eof() {
return $this->bufferSize <= 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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