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-rw-r--r--src/fs/DirectoryReader.hxx87
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+/*
+ * Copyright (C) 2003-2013 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_FS_DIRECTORY_READER_HXX
+#define MPD_FS_DIRECTORY_READER_HXX
+
+#include "check.h"
+#include "Path.hxx"
+
+#include <dirent.h>
+
+/**
+ * Reader for directory entries.
+ */
+class DirectoryReader {
+ DIR *const dirp;
+ dirent *ent;
+public:
+ /**
+ * Creates new directory reader for the specified #dir.
+ */
+ explicit DirectoryReader(const Path &dir)
+ : dirp(opendir(dir.c_str())),
+ ent(nullptr) {
+ }
+
+ DirectoryReader(const DirectoryReader &other) = delete;
+ DirectoryReader &operator=(const DirectoryReader &other) = delete;
+
+ /**
+ * Destroys this instance.
+ */
+ ~DirectoryReader() {
+ if (!HasFailed())
+ closedir(dirp);
+ }
+
+ /**
+ * Checks if directory failed to open.
+ */
+ bool HasFailed() const {
+ return dirp == nullptr;
+ }
+
+ /**
+ * Checks if directory entry is available.
+ */
+ bool HasEntry() const {
+ assert(!HasFailed());
+ return ent != nullptr;
+ }
+
+ /**
+ * Reads next directory entry.
+ */
+ bool ReadEntry() {
+ assert(!HasFailed());
+ ent = readdir(dirp);
+ return HasEntry();
+ }
+
+ /**
+ * Extracts directory entry that was previously read by #ReadEntry.
+ */
+ Path GetEntry() const {
+ assert(HasEntry());
+ return Path::FromFS(ent->d_name);
+ }
+};
+
+#endif