1 files changed, 101 insertions, 0 deletions
diff --git a/apps/files_external/3rdparty/icewind/smb/src/Native/NativeReadStream.php b/apps/files_external/3rdparty/icewind/smb/src/Native/NativeReadStream.php
new file mode 100644
index 00000000000..3ef5b21639f
--- /dev/null
+++ b/apps/files_external/3rdparty/icewind/smb/src/Native/NativeReadStream.php
@@ -0,0 +1,101 @@
+<?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;
+
+/**
+ * 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', NativeReadStream::class);
+		$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;
+	}
+}