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