/*

 * Copyright (c) 2020 Red Hat, Inc.

 *

 * 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., 51 Franklin Street, Fifth Floor, Boston, MA

 * 02110-1301, USA. 

 *

 * $Id: //eng/uds-releases/jasper/src/uds/indexVersion.c#1 $

 */

#include "indexVersion.h"

void initializeIndexVersion(struct index_version *version,

                            uint32_t              superVersion)

{

  /*

   * Version 1 was introduced for the first single file layout. It was used in

   * RHEL7 and in RHEL8.0 Beta.  No kernel index ever used an earlier version.

   */

  /*

   * Version 2 was created when we discovered that the volume header page was

   * written in native endian format.  It was used in RHEL8.0 and RHEL8.1.  We

   * stopped reading and the volume header page, and changed to version 2 so 

   * that an index creaed on RHEL8 cannot be taken back an used on RHEL7.

   *

   * Versions 1 and 2 are identical in normal operation (i.e. after the index

   * is loaded).

   */

  /*

   * Version 3 was created when we discovered the the chapter index headers

   * were written in native endian format.  It was first used in RHEL8.2 and is

   * the current version for new indices.

   *

   * Versions before 3 read and write native endian chapter headers.  Version 3

   * reads chapter headers in any endian order, and writes little-endian

   * chapter headers.

   */

  bool chapterIndexHeaderNativeEndian = superVersion < 3;

  *version = (struct index_version) {

    .chapterIndexHeaderNativeEndian = chapterIndexHeaderNativeEndian,

  };

}