/*

 * Input/Output (IO) handle functions

 *

 * Copyright (C) 2011-2024, 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 "libbde_definitions.h"

#include "libbde_encryption_context.h"

#include "libbde_io_handle.h"

#include "libbde_libbfio.h"

#include "libbde_libcerror.h"

#include "libbde_libcnotify.h"

#include "libbde_ntfs_volume_header.h"

#include "libbde_sector_data.h"

#include "libbde_unused.h"

#include "bde_volume.h"

/* Creates an IO handle

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

 * Returns 1 if successful or -1 on error

 */

int libbde_io_handle_initialize(

     libbde_io_handle_t **io_handle,

     libcerror_error_t **error )

{

  static char *function = "libbde_io_handle_initialize";

  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_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_VALUE_ALREADY_SET,

     "%s: invalid IO handle value already set.",

     function );

    return( -1 );

  }

  *io_handle = memory_allocate_structure(

                libbde_io_handle_t );

  if( *io_handle == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_MEMORY,

     LIBCERROR_MEMORY_ERROR_INSUFFICIENT,

     "%s: unable to create IO handle.",

     function );

    goto on_error;

  }

  if( memory_set(

       *io_handle,

       0,

       sizeof( libbde_io_handle_t ) ) == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_MEMORY,

     LIBCERROR_MEMORY_ERROR_SET_FAILED,

     "%s: unable to clear IO handle.",

     function );

    goto on_error;

  }

  ( *io_handle )->bytes_per_sector = 512;

  return( 1 );

on_error:

  if( *io_handle != NULL )

  {

    memory_free(

     *io_handle );

    *io_handle = NULL;

  }

  return( -1 );

}

/* Frees an IO handle

 * Returns 1 if successful or -1 on error

 */

int libbde_io_handle_free(

     libbde_io_handle_t **io_handle,

     libcerror_error_t **error )

{

  static char *function = "libbde_io_handle_free";

  int result            = 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 != NULL )

  {

    if( libbde_io_handle_clear(

         *io_handle,

         error ) != 1 )

    {

      libcerror_error_set(

       error,

       LIBCERROR_ERROR_DOMAIN_RUNTIME,

       LIBCERROR_RUNTIME_ERROR_FINALIZE_FAILED,

       "%s: unable to clear IO handle.",

       function );

      result = -1;

    }

    memory_free(

     *io_handle );

    *io_handle = NULL;

  }

  return( result );

}

/* Clears the IO handle

 * Returns 1 if successful or -1 on error

 */

int libbde_io_handle_clear(

     libbde_io_handle_t *io_handle,

     libcerror_error_t **error )

{

  static char *function = "libbde_io_handle_clear";

  if( io_handle == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid IO handle.",

     function );

    return( -1 );

  }

  io_handle->bytes_per_sector = 512;

  return( 1 );

}

/* Reads the unencrypted volume header

 * Returns 1 if successful or -1 on error

 */

int libbde_io_handle_read_unencrypted_volume_header(

     libbde_io_handle_t *io_handle,

     libbfio_handle_t *file_io_handle,

     off64_t volume_header_offset,

     libbde_encryption_context_t *encryption_context,

     libcerror_error_t **error )

{

  libbde_ntfs_volume_header_t *ntfs_volume_header = NULL;

  libbde_sector_data_t *sector_data               = NULL;

  static char *function                           = "libbde_io_handle_read_unencrypted_volume_header";

  if( io_handle == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid IO handle.",

     function );

    goto on_error;

  }

#if defined( HAVE_DEBUG_OUTPUT )

  if( libcnotify_verbose != 0 )

  {

    libcnotify_printf(

     "%s: reading unencrypted volume header at offset: %" PRIi64 " (0x%08" PRIx64 ")\n",

     function,

     volume_header_offset,

     volume_header_offset );

  }

#endif

  if( libbde_sector_data_initialize(

       &sector_data,

       io_handle->bytes_per_sector,

       error ) != 1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_INITIALIZE_FAILED,

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

     function );

    goto on_error;

  }

  if( libbde_sector_data_read_file_io_handle(

       sector_data,

       io_handle,

       file_io_handle,

       volume_header_offset,

       encryption_context,

       0,

       error ) != 1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_IO,

     LIBCERROR_IO_ERROR_READ_FAILED,

     "%s: unable to read volume header sector data.",

     function );

    goto on_error;

  }

  if( io_handle->volume_size == 0 )

  {

    if( libbde_ntfs_volume_header_initialize(

         &ntfs_volume_header,

         error ) != 1 )

    {

      libcerror_error_set(

       error,

       LIBCERROR_ERROR_DOMAIN_RUNTIME,

       LIBCERROR_RUNTIME_ERROR_INITIALIZE_FAILED,

       "%s: unable to create NTFS volume header.",

       function );

      goto on_error;

    }

    if( libbde_ntfs_volume_header_read_data(

         ntfs_volume_header,

         sector_data->data,

         sector_data->data_size,

         error ) != 1 )

    {

      libcerror_error_set(

       error,

       LIBCERROR_ERROR_DOMAIN_IO,

       LIBCERROR_IO_ERROR_READ_FAILED,

       "%s: unable to read NTFS volume header.",

       function );

      goto on_error;

    }

    io_handle->volume_size = ntfs_volume_header->volume_size;

    if( libbde_ntfs_volume_header_free(

         &ntfs_volume_header,

         error ) != 1 )

    {

      libcerror_error_set(

       error,

       LIBCERROR_ERROR_DOMAIN_RUNTIME,

       LIBCERROR_RUNTIME_ERROR_FINALIZE_FAILED,

       "%s: unable to free NTFS volume header.",

       function );

      goto on_error;

    }

  }

  if( libbde_sector_data_free(

       &sector_data,

       error ) != 1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_FINALIZE_FAILED,

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

     function );

    goto on_error;

  }

  return( 1 );

on_error:

  if( ntfs_volume_header != NULL )

  {

    libbde_ntfs_volume_header_free(

     &ntfs_volume_header,

     NULL );

  }

  if( sector_data != NULL )

  {

    libbde_sector_data_free(

     &sector_data,

     NULL );

  }

  return( -1 );

}