LocalStorage: new API abstracting filesystem walk

Prepare to make this a new plugin API, for example to use a SMB share
for the music_directory.

src/storage/FileInfo.hxx

@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_STORAGE_FILE_INFO_HXX
+#define MPD_STORAGE_FILE_INFO_HXX
+
+#include "check.h"
+
+#include <time.h>
+#include <stdint.h>
+
+struct FileInfo {
+	enum class Type : uint8_t {
+		OTHER,
+		REGULAR,
+		DIRECTORY,
+	};
+
+	Type type;
+
+	/**
+	 * The file size in bytes.  Only valid for #Type::REGULAR.
+	 */
+	uint64_t size;
+
+	/**
+	 * The modification time.  0 means unknown / not applicable.
+	 */
+	time_t mtime;
+
+	/**
+	 * Device id and inode number.  0 means unknown / not
+	 * applicable.
+	 */
+	unsigned device, inode;
+
+	bool IsRegular() const {
+		return type == Type::REGULAR;
+	}
+
+	bool IsDirectory() const {
+		return type == Type::DIRECTORY;
+	}
+};
+
+#endif