/*

 * Sector data functions

 *

 * Copyright (C) 2013-2023, 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 "libluksde_definitions.h"

#include "libluksde_encryption_context.h"

#include "libluksde_libbfio.h"

#include "libluksde_libcerror.h"

#include "libluksde_libcnotify.h"

#include "libluksde_sector_data.h"

/* Creates sector data

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

 * Returns 1 if successful or -1 on error

 */

int libluksde_sector_data_initialize(

     libluksde_sector_data_t **sector_data,

     size_t data_size,

     libcerror_error_t **error )

{

  static char *function = "libluksde_sector_data_initialize";

  if( sector_data == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid sector data.",

     function );

    return( -1 );

  }

  if( *sector_data != NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_VALUE_ALREADY_SET,

     "%s: invalid sector data value already set.",

     function );

    return( -1 );

  }

  if( ( data_size == 0 )

   || ( data_size > (size_t) MEMORY_MAXIMUM_ALLOCATION_SIZE ) )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_VALUE_EXCEEDS_MAXIMUM,

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

     function );

    return( -1 );

  }

  *sector_data = memory_allocate_structure(

                  libluksde_sector_data_t );

  if( *sector_data == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_MEMORY,

     LIBCERROR_MEMORY_ERROR_INSUFFICIENT,

     "%s: unable to create sector data.",

     function );

    goto on_error;

  }

  if( memory_set(

       *sector_data,

       0,

       sizeof( libluksde_sector_data_t ) ) == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_MEMORY,

     LIBCERROR_MEMORY_ERROR_SET_FAILED,

     "%s: unable to clear sector data.",

     function );

    memory_free(

     *sector_data );

    *sector_data = NULL;

    return( -1 );

  }

  ( *sector_data )->data = (uint8_t *) memory_allocate(

                                        sizeof( uint8_t ) * data_size );

  if( ( *sector_data )->data == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_MEMORY,

     LIBCERROR_MEMORY_ERROR_INSUFFICIENT,

     "%s: unable to create data.",

     function );

    goto on_error;

  }

  ( *sector_data )->data_size = data_size;

  return( 1 );

on_error:

  if( *sector_data != NULL )

  {

    memory_free(

     *sector_data );

    *sector_data = NULL;

  }

  return( -1 );

}

/* Frees sector data

 * Returns 1 if successful or -1 on error

 */

int libluksde_sector_data_free(

     libluksde_sector_data_t **sector_data,

     libcerror_error_t **error )

{

  static char *function = "libluksde_sector_data_free";

  int result            = 1;

  if( sector_data == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid sector data.",

     function );

    return( -1 );

  }

  if( *sector_data != NULL )

  {

    if( memory_set(

         ( *sector_data )->data,

         0,

         ( *sector_data )->data_size ) == NULL )

    {

      libcerror_error_set(

       error,

       LIBCERROR_ERROR_DOMAIN_MEMORY,

       LIBCERROR_MEMORY_ERROR_SET_FAILED,

       "%s: unable to clear data.",

       function );

      result = -1;

    }

    memory_free(

     ( *sector_data )->data );

    memory_free(

     *sector_data );

    *sector_data = NULL;

  }

  return( result );

}

/* Reads sector data

 * Returns 1 if successful or -1 on error

 */

int libluksde_sector_data_read_file_io_handle(

     libluksde_sector_data_t *sector_data,

     libbfio_handle_t *file_io_handle,

     off64_t file_offset,

     libluksde_encryption_context_t *encryption_context,

     uint64_t sector_number,

     libcerror_error_t **error )

{

  uint8_t *encrypted_data = NULL;

  static char *function   = "libluksde_sector_data_read_file_io_handle";

  ssize_t read_count      = 0;

  if( sector_data == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid sector data.",

     function );

    return( -1 );

  }

  if( sector_data->data == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_VALUE_MISSING,

     "%s: invalid sector data - missing data.",

     function );

    return( -1 );

  }

  encrypted_data = (uint8_t *) memory_allocate(

                                sizeof( uint8_t ) * sector_data->data_size );

  if( encrypted_data == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_MEMORY,

     LIBCERROR_MEMORY_ERROR_INSUFFICIENT,

     "%s: unable to create encrypted data.",

     function );

    goto on_error;

  }

#if defined( HAVE_DEBUG_OUTPUT )

  if( libcnotify_verbose != 0 )

  {

    libcnotify_printf(

     "%s: reading sector: %" PRIu64 " data at offset: %" PRIi64 " (0x%08" PRIx64 ")\n",

     function,

     sector_number,

     file_offset,

     file_offset );

  }

#endif

  read_count = libbfio_handle_read_buffer_at_offset(

                file_io_handle,

                encrypted_data,

                sector_data->data_size,

                file_offset,

                error );

  if( read_count != (ssize_t) sector_data->data_size )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_IO,

     LIBCERROR_IO_ERROR_READ_FAILED,

     "%s: unable to read sector: %" PRIu64 " data at offset: %" PRIi64 " (0x%08" PRIx64 ").",

     function,

     sector_number,

     file_offset,

     file_offset );

    goto on_error;

  }

#if defined( HAVE_DEBUG_OUTPUT )

  if( libcnotify_verbose != 0 )

  {

    libcnotify_printf(

     "%s: encrypted sector: %" PRIu64 " data:\n",

     function,

     sector_number );

    libcnotify_print_data(

     encrypted_data,

     sector_data->data_size,

     0 );

  }

#endif

  if( libluksde_encryption_context_crypt(

       encryption_context,

       LIBLUKSDE_ENCRYPTION_CRYPT_MODE_DECRYPT,

       encrypted_data,

       sector_data->data_size,

       sector_data->data,

       sector_data->data_size,

       sector_number,

       error ) != 1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ENCRYPTION,

     LIBCERROR_ENCRYPTION_ERROR_GENERIC,

     "%s: unable to decrypt sector: %" PRIu64 " data.",

     function,

     sector_number );

    goto on_error;

  }

#if defined( HAVE_DEBUG_OUTPUT )

  if( libcnotify_verbose != 0 )

  {

    libcnotify_printf(

     "%s: sector: %" PRIu64 " data:\n",

     function,

     sector_number );

    libcnotify_print_data(

     sector_data->data,

     sector_data->data_size,

     0 );

  }

#endif

  memory_free(

   encrypted_data );

  return( 1 );

on_error:

  if( encrypted_data != NULL )

  {

    memory_free(

     encrypted_data );

  }

  return( -1 );

}