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+/*****************************************************************************
+
+Copyright (c) 2015, MariaDB Corporation.
+
+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; version 2 of the License.
+
+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, Suite 500, Boston, MA 02110-1335 USA
+
+*****************************************************************************/
+
+/**************************************************//**
+@file include/fil0fil.h
+The low-level file system encryption support functions
+
+Created 04/01/2015 Jan Lindström
+*******************************************************/
+
+/*******************************************************************//**
+Find out whether the page is page encrypted
+@return true if page is page encrypted, false if not */
+UNIV_INLINE
+bool
+fil_page_is_encrypted(
+/*==================*/
+ const byte *buf) /*!< in: page */
+{
+ return(mach_read_from_4(buf+FIL_PAGE_FILE_FLUSH_LSN_OR_KEY_VERSION) != 0);
+}
+
+/*******************************************************************//**
+Find out whether the page can be decrypted.
+The function for decrypting the page should already be executed before this.
+@return PAGE_ENCRYPTION_KEY_MISSING if key provider is available, but key is not available
+ 0 if decryption should be possible
+*/
+UNIV_INLINE
+ulint
+fil_page_encryption_status(
+/*===================*/
+ const byte *buf, /*!< in: page */
+ ulint space_id) /*!< in: space_id */
+{
+ ulint page_type = mach_read_from_2(buf+FIL_PAGE_TYPE);
+
+ if (page_type == FIL_PAGE_TYPE_FSP_HDR) {
+ fil_space_crypt_t *crypt_data = fil_space_get_crypt_data(space_id);
+
+ if (crypt_data != NULL) {
+ if (!has_encryption_key(crypt_data->keys[0].key_version)) {
+ /* accessing table would surely fail, because no key or no key provider available */
+ return FIL_ENCRYPTION_KEY_MISSING;
+ }
+ }
+ } else {
+ ulint key = mach_read_from_4(buf + FIL_PAGE_FILE_FLUSH_LSN_OR_KEY_VERSION);
+ if (!has_encryption_key(key)) {
+ return FIL_ENCRYPTION_KEY_MISSING;
+ }
+ }
+ return 0;
+}