/*

 * The B-tree footer functions

 *

 * Copyright (C) 2018-2023, Joachim Metz <joachim.metz@gmail.com>

 *

 * Refer to AUTHORS for acknowledgements.

 *

 * This program is free software: you can redistribute it and/or modify

 * it under the terms of the GNU Lesser General Public License as published by

 * the Free Software Foundation, either version 3 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 Lesser General Public License

 * along with this program.  If not, see <https://www.gnu.org/licenses/>.

 */

#include <common.h>

#include <byte_stream.h>

#include <memory.h>

#include <types.h>

#include "libfsapfs_btree_footer.h"

#include "libfsapfs_debug.h"

#include "libfsapfs_libcerror.h"

#include "libfsapfs_libcnotify.h"

#include "fsapfs_btree.h"

/* Creates a B-tree footer

 * Make sure the value btree_footer is referencing, is set to NULL

 * Returns 1 if successful or -1 on error

 */

int libfsapfs_btree_footer_initialize(

     libfsapfs_btree_footer_t **btree_footer,

     libcerror_error_t **error )

{

  static char *function = "libfsapfs_btree_footer_initialize";

  if( btree_footer == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid B-tree footer.",

     function );

    return( -1 );

  }

  if( *btree_footer != NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_VALUE_ALREADY_SET,

     "%s: invalid B-tree footer value already set.",

     function );

    return( -1 );

  }

  *btree_footer = memory_allocate_structure(

                   libfsapfs_btree_footer_t );

  if( *btree_footer == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_MEMORY,

     LIBCERROR_MEMORY_ERROR_INSUFFICIENT,

     "%s: unable to create B-tree footer.",

     function );

    goto on_error;

  }

  if( memory_set(

       *btree_footer,

       0,

       sizeof( libfsapfs_btree_footer_t ) ) == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_MEMORY,

     LIBCERROR_MEMORY_ERROR_SET_FAILED,

     "%s: unable to clear B-tree footer.",

     function );

    goto on_error;

  }

  return( 1 );

on_error:

  if( *btree_footer != NULL )

  {

    memory_free(

     *btree_footer );

    *btree_footer = NULL;

  }

  return( -1 );

}

/* Frees a B-tree footer

 * Returns 1 if successful or -1 on error

 */

int libfsapfs_btree_footer_free(

     libfsapfs_btree_footer_t **btree_footer,

     libcerror_error_t **error )

{

  static char *function = "libfsapfs_btree_footer_free";

  if( btree_footer == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid B-tree footer.",

     function );

    return( -1 );

  }

  if( *btree_footer != NULL )

  {

    memory_free(

     *btree_footer );

    *btree_footer = NULL;

  }

  return( 1 );

}

/* Reads the B-tree footer

 * Returns 1 if successful or -1 on error

 */

int libfsapfs_btree_footer_read_data(

     libfsapfs_btree_footer_t *btree_footer,

     const uint8_t *data,

     size_t data_size,

     libcerror_error_t **error )

{

  static char *function = "libfsapfs_btree_footer_read_data";

#if defined( HAVE_DEBUG_OUTPUT )

  uint64_t value_64bit  = 0;

  uint32_t value_32bit  = 0;

#endif

  if( btree_footer == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid B-tree footer.",

     function );

    return( -1 );

  }

  if( data == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_VALUE_MISSING,

     "%s: invalid data.",

     function );

    return( -1 );

  }

  if( ( data_size < sizeof( fsapfs_btree_footer_t ) )

   || ( data_size > (size_t) SSIZE_MAX ) )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_VALUE_OUT_OF_BOUNDS,

     "%s: invalid data size value out of bounds.",

     function );

    return( -1 );

  }

#if defined( HAVE_DEBUG_OUTPUT )

  if( libcnotify_verbose != 0 )

  {

    libcnotify_printf(

     "%s: B-tree footer data:\n",

     function );

    libcnotify_print_data(

     data,

     sizeof( fsapfs_btree_footer_t ),

     LIBCNOTIFY_PRINT_DATA_FLAG_GROUP_DATA );

  }

#endif

  byte_stream_copy_to_uint32_little_endian(

   ( (fsapfs_btree_footer_t *) data )->node_size,

   btree_footer->node_size );

  byte_stream_copy_to_uint32_little_endian(

   ( (fsapfs_btree_footer_t *) data )->key_size,

   btree_footer->key_size );

  byte_stream_copy_to_uint32_little_endian(

   ( (fsapfs_btree_footer_t *) data )->value_size,

   btree_footer->value_size );

  byte_stream_copy_to_uint32_little_endian(

   ( (fsapfs_btree_footer_t *) data )->maximum_key_size,

   btree_footer->maximum_key_size );

  byte_stream_copy_to_uint32_little_endian(

   ( (fsapfs_btree_footer_t *) data )->maximum_value_size,

   btree_footer->maximum_value_size );

#if defined( HAVE_DEBUG_OUTPUT )

  if( libcnotify_verbose != 0 )

  {

    byte_stream_copy_to_uint32_little_endian(

     ( (fsapfs_btree_footer_t *) data )->flags,

     value_32bit );

    libcnotify_printf(

     "%s: flags\t\t\t\t\t: 0x%08" PRIx32 "\n",

     function,

     value_32bit );

    libfsapfs_debug_print_btree_flags(

     value_32bit );

    libcnotify_printf(

     "\n" );

    libcnotify_printf(

     "%s: node size\t\t\t\t: %" PRIu32 "\n",

     function,

     btree_footer->node_size );

    libcnotify_printf(

     "%s: key size\t\t\t\t: %" PRIu32 "\n",

     function,

     btree_footer->key_size );

    libcnotify_printf(

     "%s: value size\t\t\t\t: %" PRIu32 "\n",

     function,

     btree_footer->value_size );

    libcnotify_printf(

     "%s: maximum key size\t\t\t: %" PRIu32 "\n",

     function,

     btree_footer->maximum_key_size );

    libcnotify_printf(

     "%s: maximum value size\t\t\t: %" PRIu32 "\n",

     function,

     btree_footer->maximum_value_size );

    byte_stream_copy_to_uint64_little_endian(

     ( (fsapfs_btree_footer_t *) data )->total_number_of_keys,

     value_64bit );

    libcnotify_printf(

     "%s: total number of keys\t\t\t: %" PRIu64 "\n",

     function,

     value_64bit );

    byte_stream_copy_to_uint64_little_endian(

     ( (fsapfs_btree_footer_t *) data )->total_number_of_nodes,

     value_64bit );

    libcnotify_printf(

     "%s: total number of nodes\t\t\t: %" PRIu64 "\n",

     function,

     value_64bit );

    libcnotify_printf(

     "\n" );

  }

#endif /* defined( HAVE_DEBUG_OUTPUT ) */

  return( 1 );

}