directory: moved code to database.c

Taming the directory.c monster, part II: move the database management
stuff to database.  directory.c should only contain code which works
on directory objects.

src/database.h

@@ -0,0 +1,55 @@
+/* the Music Player Daemon (MPD)
+ * Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
+ * Copyright (C) 2008 Max Kellermann <max@duempel.org>
+ * This project's homepage is: 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef DATABASE_H
+#define DATABASE_H
+
+#include <sys/time.h>
+
+struct directory;
+struct client;
+
+void directory_init(void);
+
+void directory_finish(void);
+
+struct directory *
+directory_get_root(void);
+
+struct directory *
+getDirectory(const char *name);
+
+struct song *
+getSongFromDB(const char *file);
+
+int traverseAllIn(const char *name,
+		  int (*forEachSong) (struct song *, void *),
+		  int (*forEachDir) (struct directory *, void *), void *data);
+
+int printDirectoryInfo(struct client *client, const char *name);
+
+int checkDirectoryDB(void);
+
+int writeDirectoryDB(void);
+
+int readDirectoryDB(void);
+
+time_t getDbModTime(void);
+
+#endif