/*

 * Extent index functions

 *

 * Copyright (C) 2010-2025, 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_extent_index.h"

#include "libfsext_libcerror.h"

#include "libfsext_libcnotify.h"

#include "fsext_extents.h"

/* Creates an extent index

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

 * Returns 1 if successful or -1 on error

 */

int libfsext_extent_index_initialize(

     libfsext_extent_index_t **extent_index,

     libcerror_error_t **error )

{

  static char *function = "libfsext_extent_index_initialize";

  if( extent_index == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid extent index.",

     function );

    return( -1 );

  }

  if( *extent_index != NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_VALUE_ALREADY_SET,

     "%s: invalid extent index value already set.",

     function );

    return( -1 );

  }

  *extent_index = memory_allocate_structure(

                   libfsext_extent_index_t );

  if( *extent_index == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_MEMORY,

     LIBCERROR_MEMORY_ERROR_INSUFFICIENT,

     "%s: unable to create extent index.",

     function );

    goto on_error;

  }

  if( memory_set(

       *extent_index,

       0,

       sizeof( libfsext_extent_index_t ) ) == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_MEMORY,

     LIBCERROR_MEMORY_ERROR_SET_FAILED,

     "%s: unable to clear extent index.",

     function );

    goto on_error;

  }

  return( 1 );

on_error:

  if( *extent_index != NULL )

  {

    memory_free(

     *extent_index );

    *extent_index = NULL;

  }

  return( -1 );

}

/* Frees an extent index

 * Returns 1 if successful or -1 on error

 */

int libfsext_extent_index_free(

     libfsext_extent_index_t **extent_index,

     libcerror_error_t **error )

{

  static char *function = "libfsext_extent_index_free";

  if( extent_index == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid extent index.",

     function );

    return( -1 );

  }

  if( *extent_index != NULL )

  {

    memory_free(

     *extent_index );

    *extent_index = NULL;

  }

  return( 1 );

}

/* Reads the extent index data

 * Returns 1 if successful or -1 on error

 */

int libfsext_extent_index_read_data(

     libfsext_extent_index_t *extent_index,

     const uint8_t *data,

     size_t data_size,

     libcerror_error_t **error )

{

  static char *function                = "libfsext_extent_index_read_data";

  uint32_t physical_block_number_lower = 0;

  uint16_t physical_block_number_upper = 0;

#if defined( HAVE_DEBUG_OUTPUT )

  uint16_t value_16bit                 = 0;

#endif

  if( extent_index == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid extent index.",

     function );

    return( -1 );

  }

  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 < sizeof( fsext_extent_index_ext4_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: extent index data:\n",

     function );

    libcnotify_print_data(

     data,

     data_size,

     0 );

  }

#endif

  byte_stream_copy_to_uint32_little_endian(

   ( (fsext_extent_index_ext4_t *) data )->logical_block_number,

   extent_index->logical_block_number );

  byte_stream_copy_to_uint32_little_endian(

   ( (fsext_extent_index_ext4_t *) data )->physical_block_number_lower,

   physical_block_number_lower );

  byte_stream_copy_to_uint16_little_endian(

   ( (fsext_extent_index_ext4_t *) data )->physical_block_number_upper,

   physical_block_number_upper );

#if defined( HAVE_DEBUG_OUTPUT )

  if( libcnotify_verbose != 0 )

  {

    libcnotify_printf(

     "%s: logical block number\t\t\t: %" PRIu32 "\n",

     function,

     extent_index->logical_block_number );

    libcnotify_printf(

     "%s: physical block number (lower)\t\t: %" PRIu32 "\n",

     function,

     physical_block_number_lower );

    libcnotify_printf(

     "%s: physical block number (upper)\t\t: %" PRIu16 "\n",

     function,

     physical_block_number_upper );

    byte_stream_copy_to_uint16_little_endian(

     ( (fsext_extent_index_ext4_t *) data )->unknown1,

     value_16bit );

    libcnotify_printf(

     "%s: unknown1\t\t\t\t: 0x%04" PRIx16 "\n",

     function,

     value_16bit );

  }

#endif /* defined( HAVE_DEBUG_OUTPUT ) */

  extent_index->physical_block_number = ( (uint64_t) physical_block_number_upper << 32 ) | physical_block_number_lower;

#if defined( HAVE_DEBUG_OUTPUT )

  if( libcnotify_verbose != 0 )

  {

    libcnotify_printf(

     "%s: physical block number\t\t\t: %" PRIu32 "\n",

     function,

     extent_index->physical_block_number );

    libcnotify_printf(

     "\n" );

  }

#endif /* defined( HAVE_DEBUG_OUTPUT ) */

  return( 1 );

}