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diff --git a/libdvdnav/read_cache.h b/libdvdnav/read_cache.h
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+/* 
+ * Copyright (C) 2000 Rich Wareham <richwareham@users.sourceforge.net>
+ * 
+ * This file is part of libdvdnav, a DVD navigation library.
+ * 
+ * libdvdnav 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.
+ * 
+ * libdvdnav 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
+ *
+ * $Id: read_cache.h,v 1.1 2002/08/08 17:49:21 richwareham Exp $
+ *
+ */
+
+#ifndef __DVDNAV_READ_CACHE_H
+#define __DVDNAV_READ_CACHE_H
+
+#include "dvdnav_internal.h"
+
+/* Opaque cache type -- defined in dvdnav_internal.h */
+/* typedef struct read_cache_s read_cache_t; */
+
+/* EXPERIMENTAL: Setting the following to 1 will use an experimental multi-threaded
+ *               read-ahead cache. 
+ */
+#define _MULTITHREAD_ 0
+
+/* Constructor/destructors */
+read_cache_t *dvdnav_read_cache_new(dvdnav_t* dvd_self);
+void dvdnav_read_cache_free(read_cache_t* self);
+
+/* This function MUST be called whenever self->file changes. */
+void dvdnav_read_cache_clear(read_cache_t *self);
+/* This function is called just after reading the NAV packet. */
+void dvdnav_pre_cache_blocks(read_cache_t *self, int sector, size_t block_count);
+/* This function will do the cache read.
+ * The buffer handed in must be malloced to take one dvd block.
+ * On a cache hit, a different buffer will be returned though.
+ * Those buffers must _never_ be freed. */
+int dvdnav_read_cache_block(read_cache_t *self, int sector, size_t block_count, uint8_t **buf);
+
+#endif /* __DVDNAV_READ_CACHE_H */