static extern int rc_extract_packages_from_undump_file(IntPtr filename, RCSharp.ChannelAndSubdFnNative channel_callback, RCSharp.PackageDelegateNative package_callback, RCSharp.PackageMatchDelegateNative lock_callback, IntPtr user_data);
static extern int rc_extract_packages_from_undump_buffer(out byte data, int len, RCSharp.ChannelAndSubdFnNative channel_callback, RCSharp.PackageDelegateNative package_callback, RCSharp.PackageMatchDelegateNative lock_callback, IntPtr user_data);
static extern int rc_world_foreach_lock(IntPtr raw, RCSharp.PackageMatchDelegateNative fn, IntPtr user_data);