--- /dev/null
+/*
+ * Copyright notice from original mutt:
+ * Copyright (C) 2004 Thomas Glanzmann <sithglan@stud.uni-erlangen.de>
+ * Copyright (C) 2004 Tobias Werth <sitowert@stud.uni-erlangen.de>
+ * Copyright (C) 2004 Brian Fundakowski Feldman <green@FreeBSD.org>
+ *
+ * This file is part of mutt-ng, see http://www.muttng.org/.
+ * It's licensed under the GNU General Public License,
+ * please see the file GPL in the top level source directory.
+ */
+#ifndef _MUTT_HCACHE_H
+#define _MUTT_HCACHE_H
+
+#ifdef USE_HCACHE
+void *mutt_hcache_open(const char *path, const char *folder);
+void mutt_hcache_close(void *db);
+HEADER *mutt_hcache_restore(const unsigned char *d, HEADER **oh);
+void *mutt_hcache_fetch(void *db, const char *filename,
+ ssize_t (*keylen)(const char *fn));
+int mutt_hcache_store(void *db, const char *filename, HEADER *h,
+ unsigned long uid_validity,
+ ssize_t (*keylen)(const char *fn));
+int mutt_hcache_delete(void *db, const char *filename,
+ ssize_t (*keylen)(const char *fn));
+#endif /* USE_HCACHE */
+
+#endif /* !_MUTT_HCACHE_H */