add directory wrapper base

src/DirectoryWrapper.php

@@ -0,0 +1,103 @@
+<?php
+/**
+ * Copyright (c) 2015 Robin Appelman <icewind@owncloud.com>
+ * This file is licensed under the Licensed under the MIT license:
+ * http://opensource.org/licenses/MIT
+ */
+
+namespace Icewind\Streams;
+
+class DirectoryWrapper implements Directory {
+	/**
+	 * @var resource
+	 */
+	public $context;
+
+	/**
+	 * @var resource
+	 */
+	protected $source;
+
+	/**
+	 * Load the source from the stream context and return the context options
+	 *
+	 * @param string $name
+	 * @return array
+	 * @throws \Exception
+	 */
+	protected function loadContext($name) {
+		$context = stream_context_get_options($this->context);
+		if (isset($context[$name])) {
+			$context = $context[$name];
+		} else {
+			throw new \BadMethodCallException('Invalid context, "' . $name . '" options not set');
+		}
+		if (isset($context['source']) and is_resource($context['source'])) {
+			$this->source = $context['source'];
+		} else {
+			throw new \BadMethodCallException('Invalid context, source not set');
+		}
+		return $context;
+	}
+
+	/**
+	 * @param string $path
+	 * @param array $options
+	 * @return bool
+	 */
+	public function dir_opendir($path, $options) {
+		$this->loadContext('dir');
+		return true;
+	}
+
+	/**
+	 * @return string
+	 */
+	public function dir_readdir() {
+		return readdir($this->source);
+	}
+
+	/**
+	 * @return bool
+	 */
+	public function dir_closedir() {
+		closedir($this->source);
+		return true;
+	}
+
+	/**
+	 * @return bool
+	 */
+	public function dir_rewinddir() {
+		rewinddir($this->source);
+		return true;
+	}
+
+	/**
+	 * Creates a directory handle from the provided array or iterator
+	 *
+	 * @param resource $source
+	 * @return resource
+	 *
+	 * @throws \BadMethodCallException
+	 */
+	public static function wrap($source) {
+		$options = array(
+			'dir' => array(
+				'source' => $source)
+		);
+		return self::wrapWithOptions($options);
+	}
+
+	/**
+	 * @param string $options the options for the context to wrap the stream with
+	 * @return resource
+	 */
+	protected static function wrapWithOptions($options) {
+		$context = stream_context_create($options);
+		stream_wrapper_register('dirwrapper', static::class);
+		$wrapped = opendir('dirwrapper://', $context);
+		stream_wrapper_unregister('dirwrapper');
+		return $wrapped;
+	}
+}