/*

 * Group descriptor functions

 *

 * Copyright (C) 2010-2024, 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 "libfsext_checksum.h"

#include "libfsext_definitions.h"

#include "libfsext_group_descriptor.h"

#include "libfsext_io_handle.h"

#include "libfsext_libbfio.h"

#include "libfsext_libcerror.h"

#include "libfsext_libcnotify.h"

#include "fsext_group_descriptor.h"

/* Creates a group descriptor

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

 * Returns 1 if successful or -1 on error

 */

int libfsext_group_descriptor_initialize(

     libfsext_group_descriptor_t **group_descriptor,

     libcerror_error_t **error )

{

  static char *function = "libfsext_group_descriptor_initialize";

  if( group_descriptor == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid group descriptor.",

     function );

    return( -1 );

  }

  if( *group_descriptor != NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_VALUE_ALREADY_SET,

     "%s: invalid group descriptor value already set.",

     function );

    return( -1 );

  }

  *group_descriptor = memory_allocate_structure(

                       libfsext_group_descriptor_t );

  if( *group_descriptor == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_MEMORY,

     LIBCERROR_MEMORY_ERROR_INSUFFICIENT,

     "%s: unable to create group descriptor.",

     function );

    goto on_error;

  }

  if( memory_set(

       *group_descriptor,

       0,

       sizeof( libfsext_group_descriptor_t ) ) == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_MEMORY,

     LIBCERROR_MEMORY_ERROR_SET_FAILED,

     "%s: unable to clear group descriptor.",

     function );

    goto on_error;

  }

  return( 1 );

on_error:

  if( *group_descriptor != NULL )

  {

    memory_free(

     *group_descriptor );

    *group_descriptor = NULL;

  }

  return( -1 );

}

/* Frees a group descriptor

 * Returns 1 if successful or -1 on error

 */

int libfsext_group_descriptor_free(

     libfsext_group_descriptor_t **group_descriptor,

     libcerror_error_t **error )

{

  static char *function = "libfsext_group_descriptor_free";

  if( group_descriptor == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid group descriptor.",

     function );

    return( -1 );

  }

  if( *group_descriptor != NULL )

  {

    memory_free(

     *group_descriptor );

    *group_descriptor = NULL;

  }

  return( 1 );

}

/* Reads the group descriptor data

 * Returns 1 if successful or -1 on error

 */

int libfsext_group_descriptor_read_data(

     libfsext_group_descriptor_t *group_descriptor,

     libfsext_io_handle_t *io_handle,

     const uint8_t *data,

     size_t data_size,

     libcerror_error_t **error )

{

  uint8_t checksum_data[ 4 ];

  uint8_t empty_checksum_data[ 2 ]  = { 0, 0 };

  static char *function             = "libfsext_group_descriptor_read_data";

  size_t group_descriptor_data_size = 0;

  uint64_t value_64bit              = 0;

  uint32_t calculated_checksum      = 0;

  uint32_t stored_checksum          = 0;

  uint32_t value_32bit              = 0;

  uint16_t value_16bit              = 0;

  if( group_descriptor == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid group descriptor.",

     function );

    return( -1 );

  }

  if( io_handle == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid IO handle.",

     function );

    return( -1 );

  }

  if( io_handle->format_version < 4 )

  {

    group_descriptor_data_size = sizeof( fsext_group_descriptor_ext2_t );

  }

  else if( ( ( io_handle->incompatible_features_flags & LIBFSEXT_INCOMPATIBLE_FEATURES_FLAG_64BIT_SUPPORT ) != 0 )

        && ( io_handle->group_descriptor_size > 32 ) )

  {

    group_descriptor_data_size = 64;

  }

  else

  {

    group_descriptor_data_size = 32;

  }

  if( data == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid data.",

     function );

    return( -1 );

  }

  if( data_size < group_descriptor_data_size )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_VALUE_TOO_SMALL,

     "%s: invalid data size value too small.",

     function );

    return( -1 );

  }

  if( data_size > (size_t) SSIZE_MAX )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_VALUE_EXCEEDS_MAXIMUM,

     "%s: invalid data size value exceeds maximum.",

     function );

    return( -1 );

  }

#if defined( HAVE_DEBUG_OUTPUT )

  if( libcnotify_verbose != 0 )

  {

    libcnotify_printf(

     "%s: group descriptor data:\n",

     function );

    libcnotify_print_data(

     data,

     group_descriptor_data_size,

     0 );

  }

#endif /* defined( HAVE_DEBUG_OUTPUT ) */

  byte_stream_copy_to_uint32_little_endian(

   ( (fsext_group_descriptor_ext2_t *) data )->block_bitmap_block_number,

   group_descriptor->block_bitmap_block_number );

  byte_stream_copy_to_uint32_little_endian(

   ( (fsext_group_descriptor_ext2_t *) data )->inode_bitmap_block_number,

   group_descriptor->inode_bitmap_block_number );

  byte_stream_copy_to_uint32_little_endian(

   ( (fsext_group_descriptor_ext2_t *) data )->inode_table_block_number,

   group_descriptor->inode_table_block_number );

  byte_stream_copy_to_uint16_little_endian(

   ( (fsext_group_descriptor_ext2_t *) data )->number_of_unallocated_blocks,

   group_descriptor->number_of_unallocated_blocks );

  byte_stream_copy_to_uint16_little_endian(

   ( (fsext_group_descriptor_ext2_t *) data )->number_of_unallocated_inodes,

   group_descriptor->number_of_unallocated_inodes );

  byte_stream_copy_to_uint16_little_endian(

   ( (fsext_group_descriptor_ext2_t *) data )->number_of_directories,

   group_descriptor->number_of_directories );

  if( io_handle->format_version < 4 )

  {

#if defined( HAVE_DEBUG_OUTPUT )

    if( libcnotify_verbose != 0 )

    {

      libcnotify_printf(

       "%s: block bitmap block number\t\t: %" PRIu64 "\n",

       function,

       group_descriptor->block_bitmap_block_number );

      libcnotify_printf(

       "%s: inode bitmap block number\t\t: %" PRIu64 "\n",

       function,

       group_descriptor->inode_bitmap_block_number );

      libcnotify_printf(

       "%s: inode table block number\t\t: %" PRIu64 "\n",

       function,

       group_descriptor->inode_table_block_number );

      libcnotify_printf(

       "%s: number of unallocated blocks\t: %" PRIu32 "\n",

       function,

       group_descriptor->number_of_unallocated_blocks );

      libcnotify_printf(

       "%s: number of unallocated inodes\t: %" PRIu32 "\n",

       function,

       group_descriptor->number_of_unallocated_inodes );

      libcnotify_printf(

       "%s: number of directories\t\t: %" PRIu32 "\n",

       function,

       group_descriptor->number_of_directories );

      libcnotify_printf(

       "%s: padding1:\n",

       function );

      libcnotify_print_data(

       ( (fsext_group_descriptor_ext2_t *) data )->padding1,

       2,

       0 );

      libcnotify_printf(

       "%s: unknown1:\n",

       function );

      libcnotify_print_data(

       ( (fsext_group_descriptor_ext2_t *) data )->unknown1,

       12,

       0 );

    }

#endif /* defined( HAVE_DEBUG_OUTPUT ) */

  }

  else

  {

    byte_stream_copy_to_uint32_little_endian(

     ( (fsext_group_descriptor_ext4_t *) data )->exclude_bitmap_block_number_lower,

     group_descriptor->exclude_bitmap_block_number );

    byte_stream_copy_to_uint16_little_endian(

     ( (fsext_group_descriptor_ext4_t *) data )->block_bitmap_checksum_lower,

     group_descriptor->block_bitmap_checksum );

    byte_stream_copy_to_uint16_little_endian(

     ( (fsext_group_descriptor_ext4_t *) data )->inode_bitmap_checksum_lower,

     group_descriptor->inode_bitmap_checksum );

    byte_stream_copy_to_uint16_little_endian(

     ( (fsext_group_descriptor_ext4_t *) data )->number_of_unused_inodes_lower,

     group_descriptor->number_of_unused_inodes );

    byte_stream_copy_to_uint16_little_endian(

     ( (fsext_group_descriptor_ext4_t *) data )->checksum,

     value_16bit );

    stored_checksum = value_16bit;

#if defined( HAVE_DEBUG_OUTPUT )

    if( libcnotify_verbose != 0 )

    {

      libcnotify_printf(

       "%s: block bitmap block number (lower)\t\t: %" PRIu64 "\n",

       function,

       group_descriptor->block_bitmap_block_number );

      libcnotify_printf(

       "%s: inode bitmap block number (lower)\t\t: %" PRIu64 "\n",

       function,

       group_descriptor->inode_bitmap_block_number );

      libcnotify_printf(

       "%s: inode table block number (lower)\t\t: %" PRIu64 "\n",

       function,

       group_descriptor->inode_table_block_number );

      libcnotify_printf(

       "%s: number of unallocated blocks (lower)\t: %" PRIu32 "\n",

       function,

       group_descriptor->number_of_unallocated_blocks );

      libcnotify_printf(

       "%s: number of unallocated inodes (lower)\t: %" PRIu32 "\n",

       function,

       group_descriptor->number_of_unallocated_inodes );

      libcnotify_printf(

       "%s: number of directories (lower)\t\t: %" PRIu32 "\n",

       function,

       group_descriptor->number_of_directories );

      libcnotify_printf(

       "%s: exclude bitmap block number (lower)\t: %" PRIu64 "\n",

       function,

       group_descriptor->exclude_bitmap_block_number );

      libcnotify_printf(

       "%s: block bitmap checksum (lower)\t\t: 0x%04" PRIx32 "\n",

       function,

       group_descriptor->block_bitmap_checksum );

      libcnotify_printf(

       "%s: inode bitmap checksum (lower)\t\t: 0x%04" PRIx32 "\n",

       function,

       group_descriptor->inode_bitmap_checksum );

      libcnotify_printf(

       "%s: number of unused inodes (lower)\t\t: %" PRIu32 "\n",

       function,

       group_descriptor->number_of_unused_inodes );

      byte_stream_copy_to_uint16_little_endian(

       ( (fsext_group_descriptor_ext4_t *) data )->checksum,

       value_16bit );

      libcnotify_printf(

       "%s: checksum\t\t\t\t\t: 0x%04" PRIx16 "\n",

       function,

       value_16bit );

    }

#endif /* defined( HAVE_DEBUG_OUTPUT ) */

    if( ( ( io_handle->incompatible_features_flags & LIBFSEXT_INCOMPATIBLE_FEATURES_FLAG_64BIT_SUPPORT ) != 0 )

     && ( io_handle->group_descriptor_size > 32 ) )

    {

#if defined( HAVE_DEBUG_OUTPUT )

      if( libcnotify_verbose != 0 )

      {

        byte_stream_copy_to_uint32_little_endian(

         ( (fsext_group_descriptor_ext4_t *) data )->block_bitmap_block_number_upper,

         value_32bit );

        libcnotify_printf(

         "%s: block bitmap block number (upper)\t\t: %" PRIu32 "\n",

         function,

         value_32bit );

        byte_stream_copy_to_uint32_little_endian(

         ( (fsext_group_descriptor_ext4_t *) data )->inode_bitmap_block_number_upper,

         value_32bit );

        libcnotify_printf(

         "%s: inode bitmap block number (upper)\t\t: %" PRIu32 "\n",

         function,

         value_32bit );

        byte_stream_copy_to_uint32_little_endian(

         ( (fsext_group_descriptor_ext4_t *) data )->inode_table_block_number_upper,

         value_32bit );

        libcnotify_printf(

         "%s: inode table block number (upper)\t\t: %" PRIu32 "\n",

         function,

         value_32bit );

        byte_stream_copy_to_uint16_little_endian(

         ( (fsext_group_descriptor_ext4_t *) data )->number_of_unallocated_blocks_upper,

         value_16bit );

        libcnotify_printf(

         "%s: number of unallocated blocks (upper)\t: %" PRIu16 "\n",

         function,

         value_16bit );

        byte_stream_copy_to_uint16_little_endian(

         ( (fsext_group_descriptor_ext4_t *) data )->number_of_unallocated_inodes_upper,

         value_16bit );

        libcnotify_printf(

         "%s: number of unallocated inodes (upper)\t: %" PRIu16 "\n",

         function,

         value_16bit );

        byte_stream_copy_to_uint16_little_endian(

         ( (fsext_group_descriptor_ext4_t *) data )->number_of_directories_upper,

         value_16bit );

        libcnotify_printf(

         "%s: number of directories (upper)\t\t: %" PRIu16 "\n",

         function,

         value_16bit );

        byte_stream_copy_to_uint16_little_endian(

         ( (fsext_group_descriptor_ext4_t *) data )->number_of_unused_inodes_upper,

         value_16bit );

        libcnotify_printf(

         "%s: number of unused inodes (upper)\t\t: %" PRIu16 "\n",

         function,

         value_16bit );

        byte_stream_copy_to_uint32_little_endian(

         ( (fsext_group_descriptor_ext4_t *) data )->exclude_bitmap_block_number_upper,

         value_32bit );

        libcnotify_printf(

         "%s: exclude bitmap block number (upper)\t: %" PRIu32 "\n",

         function,

         value_32bit );

        byte_stream_copy_to_uint16_little_endian(

         ( (fsext_group_descriptor_ext4_t *) data )->block_bitmap_checksum_upper,

         value_16bit );

        libcnotify_printf(

         "%s: block bitmap checksum (upper)\t\t: 0x%04" PRIx16 "\n",

         function,

         value_16bit );

        byte_stream_copy_to_uint16_little_endian(

         ( (fsext_group_descriptor_ext4_t *) data )->inode_bitmap_checksum_upper,

         value_16bit );

        libcnotify_printf(

         "%s: inode bitmap checksum (upper)\t\t: 0x%04" PRIx16 "\n",

         function,

         value_16bit );

        libcnotify_printf(

         "%s: unknown1:\n",

         function );

        libcnotify_print_data(

         ( (fsext_group_descriptor_ext4_t *) data )->unknown1,

         4,

         0 );

      }

#endif /* defined( HAVE_DEBUG_OUTPUT ) */

      byte_stream_copy_to_uint32_little_endian(

       ( (fsext_group_descriptor_ext4_t *) data )->block_bitmap_block_number_upper,

       value_64bit );

      group_descriptor->block_bitmap_block_number |= value_64bit << 32;

      byte_stream_copy_to_uint32_little_endian(

       ( (fsext_group_descriptor_ext4_t *) data )->inode_bitmap_block_number_upper,

       value_64bit );

      group_descriptor->inode_bitmap_block_number |= value_64bit << 32;

      byte_stream_copy_to_uint32_little_endian(

       ( (fsext_group_descriptor_ext4_t *) data )->inode_table_block_number_upper,

       value_64bit );

      group_descriptor->inode_table_block_number |= value_64bit << 32;

      byte_stream_copy_to_uint16_little_endian(

       ( (fsext_group_descriptor_ext4_t *) data )->number_of_unallocated_blocks_upper,

       value_32bit );

      group_descriptor->number_of_unallocated_blocks |= value_32bit << 16;

      byte_stream_copy_to_uint16_little_endian(

       ( (fsext_group_descriptor_ext4_t *) data )->number_of_unallocated_inodes_upper,

       value_32bit );

      group_descriptor->number_of_unallocated_inodes |= value_32bit << 16;

      byte_stream_copy_to_uint16_little_endian(

       ( (fsext_group_descriptor_ext4_t *) data )->number_of_directories_upper,

       value_32bit );

      group_descriptor->number_of_directories |= value_32bit << 16;

      byte_stream_copy_to_uint16_little_endian(

       ( (fsext_group_descriptor_ext4_t *) data )->number_of_unused_inodes_upper,

       value_32bit );

      group_descriptor->number_of_unused_inodes |= value_32bit << 16;

      byte_stream_copy_to_uint32_little_endian(

       ( (fsext_group_descriptor_ext4_t *) data )->exclude_bitmap_block_number_upper,

       value_64bit );

      group_descriptor->exclude_bitmap_block_number |= value_64bit << 32;

      byte_stream_copy_to_uint16_little_endian(

       ( (fsext_group_descriptor_ext4_t *) data )->block_bitmap_checksum_upper,

       value_32bit );

      group_descriptor->block_bitmap_checksum |= value_32bit << 16;

      byte_stream_copy_to_uint16_little_endian(

       ( (fsext_group_descriptor_ext4_t *) data )->inode_bitmap_checksum_upper,

       value_32bit );

      group_descriptor->inode_bitmap_checksum |= value_32bit << 16;

    }

#if defined( HAVE_DEBUG_OUTPUT )

    if( libcnotify_verbose != 0 )

    {

      libcnotify_printf(

       "%s: block bitmap block number\t\t\t: %" PRIu64 "\n",

       function,

       group_descriptor->block_bitmap_block_number );

      libcnotify_printf(

       "%s: inode bitmap block number\t\t\t: %" PRIu64 "\n",

       function,

       group_descriptor->inode_bitmap_block_number );

      libcnotify_printf(

       "%s: inode table block number\t\t\t: %" PRIu64 "\n",

       function,

       group_descriptor->inode_table_block_number );

      libcnotify_printf(

       "%s: number of unallocated blocks\t\t: %" PRIu32 "\n",

       function,

       group_descriptor->number_of_unallocated_blocks );

      libcnotify_printf(

       "%s: number of unallocated inodes\t\t: %" PRIu32 "\n",

       function,

       group_descriptor->number_of_unallocated_inodes );

      libcnotify_printf(

       "%s: number of directories\t\t\t: %" PRIu32 "\n",

       function,

       group_descriptor->number_of_directories );

      libcnotify_printf(

       "%s: number of unused inodes\t\t\t: %" PRIu32 "\n",

       function,

       group_descriptor->number_of_unused_inodes );

      if( ( io_handle->read_only_compatible_features_flags & LIBFSEXT_READ_ONLY_COMPATIBLE_FEATURES_FLAG_METADATA_CHECKSUM ) != 0 )

      {

        libcnotify_printf(

         "%s: block bitmap checksum\t\t\t: 0x%08" PRIx32 "\n",

         function,

         group_descriptor->block_bitmap_checksum );

        libcnotify_printf(

         "%s: inode bitmap checksum\t\t\t: 0x%08" PRIx32 "\n",

         function,

         group_descriptor->inode_bitmap_checksum );

      }

      else

      {

        libcnotify_printf(

         "%s: block bitmap checksum\t\t\t: 0x%04" PRIx32 "\n",

         function,

         group_descriptor->block_bitmap_checksum );

        libcnotify_printf(

         "%s: inode bitmap checksum\t\t\t: 0x%04" PRIx32 "\n",

         function,

         group_descriptor->inode_bitmap_checksum );

      }

      libcnotify_printf(

       "\n" );

    }

#endif /* defined( HAVE_DEBUG_OUTPUT ) */

  }

/* TODO add support for crc16 checksum */

  if( ( io_handle->read_only_compatible_features_flags & LIBFSEXT_READ_ONLY_COMPATIBLE_FEATURES_FLAG_METADATA_CHECKSUM ) != 0 )

  {

    byte_stream_copy_from_uint32_little_endian(

     checksum_data,

     group_descriptor->group_number );

    if( libfsext_checksum_calculate_crc32(

         &calculated_checksum,

         checksum_data,

         4,

         io_handle->metadata_checksum_seed,

         error ) != 1 )

    {

      libcerror_error_set(

       error,

       LIBCERROR_ERROR_DOMAIN_RUNTIME,

       LIBCERROR_RUNTIME_ERROR_SET_FAILED,

       "%s: unable to calculate CRC-32.",

       function );

      return( -1 );

    }

    if( libfsext_checksum_calculate_crc32(

         &calculated_checksum,

         data,

         30,

         calculated_checksum,

         error ) != 1 )

    {

      libcerror_error_set(

       error,

       LIBCERROR_ERROR_DOMAIN_RUNTIME,

       LIBCERROR_RUNTIME_ERROR_SET_FAILED,

       "%s: unable to calculate CRC-32.",

       function );

      return( -1 );

    }

    if( libfsext_checksum_calculate_crc32(

         &calculated_checksum,

         empty_checksum_data,

         2,

         calculated_checksum,

         error ) != 1 )

    {

      libcerror_error_set(

       error,

       LIBCERROR_ERROR_DOMAIN_RUNTIME,

       LIBCERROR_RUNTIME_ERROR_SET_FAILED,

       "%s: unable to calculate CRC-32.",

       function );

      return( -1 );

    }

    if( libfsext_checksum_calculate_crc32(

         &calculated_checksum,

         &( data[ 32 ] ),

         data_size - 32,

         calculated_checksum,

         error ) != 1 )

    {

      libcerror_error_set(

       error,

       LIBCERROR_ERROR_DOMAIN_RUNTIME,

       LIBCERROR_RUNTIME_ERROR_SET_FAILED,

       "%s: unable to calculate CRC-32.",

       function );

      return( -1 );

    }

    calculated_checksum = ( 0xffffffffUL - calculated_checksum ) & 0x0000ffffUL;

    if( ( stored_checksum != 0 )

     && ( stored_checksum != calculated_checksum ) )

    {

#if defined( HAVE_DEBUG_OUTPUT )

      if( libcnotify_verbose != 0 )

      {

        libcnotify_printf(

         "%s: mismatch in checksum ( 0x%08" PRIx32 " != 0x%08" PRIx32 " ).\n",

         function,

         stored_checksum,

         calculated_checksum );

      }

#endif

    }

  }

  return( 1 );

}

/* Reads the group descriptor from a Basic File IO (bfio) handle

 * Returns 1 if successful or -1 on error

 */

int libfsext_group_descriptor_read_file_io_handle(

     libfsext_group_descriptor_t *group_descriptor,

     libfsext_io_handle_t *io_handle,

     libbfio_handle_t *file_io_handle,

     libcerror_error_t **error )

{

  uint8_t *data                     = NULL;

  static char *function             = "libfsext_group_descriptor_read_file_io_handle";

  size_t group_descriptor_data_size = 0;

  ssize_t read_count                = 0;

  if( io_handle == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid IO handle.",

     function );

    return( -1 );

  }

  if( io_handle == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid IO handle.",

     function );

    return( -1 );

  }

  if( io_handle->format_version < 4 )

  {

    group_descriptor_data_size = sizeof( fsext_group_descriptor_ext2_t );

  }

  else if( ( ( io_handle->incompatible_features_flags & LIBFSEXT_INCOMPATIBLE_FEATURES_FLAG_64BIT_SUPPORT ) != 0 )

        && ( io_handle->group_descriptor_size > 32 ) )

  {

    group_descriptor_data_size = 64;

  }

  else

  {

    group_descriptor_data_size = 32;

  }

  data = (uint8_t *) memory_allocate(

                      sizeof( uint8_t ) * group_descriptor_data_size );

  if( data == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_MEMORY,

     LIBCERROR_MEMORY_ERROR_INSUFFICIENT,

     "%s: unable to create data.",

     function );

    goto on_error;

  }

  read_count = libbfio_handle_read_buffer(

                file_io_handle,

                data,

                group_descriptor_data_size,

                error );

  if( read_count != (ssize_t) group_descriptor_data_size )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_IO,

     LIBCERROR_IO_ERROR_READ_FAILED,

     "%s: unable to read group descriptor.",

     function );

    goto on_error;

  }

  if( libfsext_group_descriptor_read_data(

       group_descriptor,

       io_handle,

       data,

       group_descriptor_data_size,

       error ) != 1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_IO,

     LIBCERROR_IO_ERROR_READ_FAILED,

     "%s: unable to read group descriptor.",

     function );

    goto on_error;

  }

  memory_free(

   data );

  return( 1 );

on_error:

  if( data != NULL )

  {

    memory_free(

     data );

  }

  return( -1 );

}