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diff --git a/src/Mapper.hxx b/src/Mapper.hxx
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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.
+ */
+
+/*
+ * Maps directory and song objects to file system paths.
+ */
+
+#ifndef MPD_MAPPER_HXX
+#define MPD_MAPPER_HXX
+
+#include "gcc.h"
+#include "gerror.h"
+
+#define PLAYLIST_FILE_SUFFIX ".m3u"
+
+class Path;
+struct Directory;
+struct song;
+
+bool mapper_init(const char *_music_dir, const char *_playlist_dir,
+		 GError **error_r);
+
+void mapper_finish(void);
+
+/**
+ * Return the absolute path of the music directory encoded in UTF-8.
+ */
+gcc_const
+const char *
+mapper_get_music_directory_utf8(void);
+
+/**
+ * Return the absolute path of the music directory encoded in the
+ * filesystem character set.
+ */
+gcc_const
+const Path &
+mapper_get_music_directory_fs(void);
+
+/**
+ * Returns true if a music directory was configured.
+ */
+gcc_const
+static inline bool
+mapper_has_music_directory(void)
+{
+	return mapper_get_music_directory_utf8() != nullptr;
+}
+
+/**
+ * If the specified absolute path points inside the music directory,
+ * this function converts it to a relative path.  If not, it returns
+ * the unmodified string pointer.
+ */
+gcc_pure
+const char *
+map_to_relative_path(const char *path_utf8);
+
+/**
+ * Determines the absolute file system path of a relative URI.  This
+ * is basically done by converting the URI to the file system charset
+ * and prepending the music directory.
+ */
+gcc_pure
+Path
+map_uri_fs(const char *uri);
+
+/**
+ * Determines the file system path of a directory object.
+ *
+ * @param directory the directory object
+ * @return the path in file system encoding, or nullptr if mapping failed
+ */
+gcc_pure
+Path
+map_directory_fs(const Directory *directory);
+
+/**
+ * Determines the file system path of a directory's child (may be a
+ * sub directory or a song).
+ *
+ * @param directory the parent directory object
+ * @param name the child's name in UTF-8
+ * @return the path in file system encoding, or nullptr if mapping failed
+ */
+gcc_pure
+Path
+map_directory_child_fs(const Directory *directory, const char *name);
+
+/**
+ * Determines the file system path of a song.  This must not be a
+ * remote song.
+ *
+ * @param song the song object
+ * @return the path in file system encoding, or nullptr if mapping failed
+ */
+gcc_pure
+Path
+map_song_fs(const struct song *song);
+
+/**
+ * Maps a file system path (relative to the music directory or
+ * absolute) to a relative path in UTF-8 encoding.
+ *
+ * @param path_fs a path in file system encoding
+ * @return the relative path in UTF-8, or nullptr if mapping failed
+ */
+gcc_malloc
+char *
+map_fs_to_utf8(const char *path_fs);
+
+/**
+ * Returns the playlist directory.
+ */
+gcc_const
+const Path &
+map_spl_path(void);
+
+/**
+ * Maps a playlist name (without the ".m3u" suffix) to a file system
+ * path.  The return value is allocated on the heap and must be freed
+ * with g_free().
+ *
+ * @return the path in file system encoding, or nullptr if mapping failed
+ */
+gcc_pure
+Path
+map_spl_utf8_to_fs(const char *name);
+
+#endif