/*

 * FAT date and time functions

 *

 * Copyright (C) 2009-2024, 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 "libfdatetime_definitions.h"

#include "libfdatetime_date_time_values.h"

#include "libfdatetime_fat_date_time.h"

#include "libfdatetime_libcerror.h"

#include "libfdatetime_types.h"

/* Creates a FAT date and time

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

 * Returns 1 if successful or -1 on error

 */

int libfdatetime_fat_date_time_initialize(

     libfdatetime_fat_date_time_t **fat_date_time,

     libcerror_error_t **error )

{

  libfdatetime_internal_fat_date_time_t *internal_fat_date_time = NULL;

  static char *function                                         = "libfdatetime_fat_date_time_initialize";

  if( fat_date_time == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid FAT date time.",

     function );

    return( -1 );

  }

  if( *fat_date_time != NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_VALUE_ALREADY_SET,

     "%s: invalid FAT date time value already set.",

     function );

    return( -1 );

  }

  internal_fat_date_time = memory_allocate_structure(

                            libfdatetime_internal_fat_date_time_t );

  if( internal_fat_date_time == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_MEMORY,

     LIBCERROR_MEMORY_ERROR_INSUFFICIENT,

     "%s: unable to create FAT date time.",

     function );

    goto on_error;

  }

  if( memory_set(

       internal_fat_date_time,

       0,

       sizeof( libfdatetime_internal_fat_date_time_t ) ) == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_MEMORY,

     LIBCERROR_MEMORY_ERROR_SET_FAILED,

     "%s: unable to clear FAT date time.",

     function );

    goto on_error;

  }

  *fat_date_time = (libfdatetime_fat_date_time_t *) internal_fat_date_time;

  return( 1 );

on_error:

  if( internal_fat_date_time != NULL )

  {

    memory_free(

     internal_fat_date_time );

  }

  return( -1 );

}

/* Frees a FAT date and time

 * Returns 1 if successful or -1 on error

 */

int libfdatetime_fat_date_time_free(

     libfdatetime_fat_date_time_t **fat_date_time,

     libcerror_error_t **error )

{

  libfdatetime_internal_fat_date_time_t *internal_fat_date_time = NULL;

  static char *function                                         = "libfdatetime_fat_date_time_free";

  if( fat_date_time == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid FAT date time.",

     function );

    return( -1 );

  }

  if( *fat_date_time != NULL )

  {

    internal_fat_date_time = (libfdatetime_internal_fat_date_time_t *) *fat_date_time;

    *fat_date_time         = NULL;

    memory_free(

     internal_fat_date_time );

  }

  return( 1 );

}

/* Converts a byte stream into a FAT date and time

 * Returns 1 if successful or -1 on error

 */

int libfdatetime_fat_date_time_copy_from_byte_stream(

     libfdatetime_fat_date_time_t *fat_date_time,

     const uint8_t *byte_stream,

     size_t byte_stream_size,

     int byte_order,

     libcerror_error_t **error )

{

  libfdatetime_internal_fat_date_time_t *internal_fat_date_time = NULL;

  static char *function                                         = "libfdatetime_fat_date_time_copy_from_byte_stream";

  if( fat_date_time == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid FAT date time.",

     function );

    return( -1 );

  }

  internal_fat_date_time = (libfdatetime_internal_fat_date_time_t *) fat_date_time;

  if( byte_stream == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid byte stream.",

     function );

    return( -1 );

  }

  if( byte_stream_size < 4 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_VALUE_TOO_SMALL,

     "%s: byte stream too small.",

     function );

    return( -1 );

  }

  if( byte_stream_size > (size_t) SSIZE_MAX )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_VALUE_EXCEEDS_MAXIMUM,

     "%s: byte stream size exceeds maximum.",

     function );

    return( -1 );

  }

  if( ( byte_order != LIBFDATETIME_ENDIAN_BIG )

   && ( byte_order != LIBFDATETIME_ENDIAN_LITTLE ) )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_UNSUPPORTED_VALUE,

     "%s: unsupported byte order.",

     function );

    return( -1 );

  }

  if( byte_order == LIBFDATETIME_ENDIAN_LITTLE )

  {

    byte_stream_copy_to_uint16_little_endian(

     byte_stream,

     internal_fat_date_time->date );

    byte_stream += 2;

    byte_stream_copy_to_uint16_little_endian(

    byte_stream,

    internal_fat_date_time->time );

  }

  else if( byte_order == LIBFDATETIME_ENDIAN_BIG )

  {

    byte_stream_copy_to_uint16_big_endian(

     byte_stream,

     internal_fat_date_time->date );

    byte_stream += 2;

    byte_stream_copy_to_uint16_big_endian(

    byte_stream,

    internal_fat_date_time->time );

  }

  return( 1 );

}

/* Converts a 32-bit value into a FAT date and time

 * Returns 1 if successful or -1 on error

 */

int libfdatetime_fat_date_time_copy_from_32bit(

     libfdatetime_fat_date_time_t *fat_date_time,

     uint32_t value_32bit,

     libcerror_error_t **error )

{

  libfdatetime_internal_fat_date_time_t *internal_fat_date_time = NULL;

  static char *function                                         = "libfdatetime_fat_date_time_copy_from_32bit";

  if( fat_date_time == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid FAT date time.",

     function );

    return( -1 );

  }

  internal_fat_date_time = (libfdatetime_internal_fat_date_time_t *) fat_date_time;

  internal_fat_date_time->date = (uint16_t) ( value_32bit & 0x0ffffL );

  internal_fat_date_time->time = (uint16_t) ( value_32bit >> 16 );

  return( 1 );

}

/* Converts a FAT date and time into a 32-bit value

 * Returns 1 if successful or -1 on error

 */

int libfdatetime_fat_date_time_copy_to_32bit(

     libfdatetime_fat_date_time_t *fat_date_time,

     uint32_t *value_32bit,

     libcerror_error_t **error )

{

  libfdatetime_internal_fat_date_time_t *internal_fat_date_time = NULL;

  static char *function                                         = "libfdatetime_fat_date_time_copy_to_32bit";

  if( fat_date_time == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid FAT date time.",

     function );

    return( -1 );

  }

  internal_fat_date_time = (libfdatetime_internal_fat_date_time_t *) fat_date_time;

  if( value_32bit == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid 32-bit value.",

     function );

    return( -1 );

  }

  *value_32bit   = internal_fat_date_time->time;

  *value_32bit <<= 16;

  *value_32bit  |= internal_fat_date_time->date;

  return( 1 );

}

/* Converts a FAT date and time into date time values

 * Returns 1 if successful or -1 on error

 */

int libfdatetime_internal_fat_date_time_copy_to_date_time_values(

     libfdatetime_internal_fat_date_time_t *internal_fat_date_time,

     libfdatetime_date_time_values_t *date_time_values,

     libcerror_error_t **error )

{

  static char *function = "libfdatetime_internal_fat_date_time_copy_to_date_time_values";

  if( internal_fat_date_time == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid FAT date time.",

     function );

    return( -1 );

  }

  if( date_time_values == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid date time values.",

     function );

    return( -1 );

  }

  /* The year value is stored in bits 9 - 15 of the date (7 bits)

   * A year value of 0 represents 1980

   */

  date_time_values->year = (uint16_t) ( 1980 + ( ( internal_fat_date_time->date >> 9 ) & 0x7f ) );

  /* The month value is stored in bits 5 - 8 of the date (4 bits)

   * A month value of 1 represents January

   */

  date_time_values->month = (uint8_t) ( ( internal_fat_date_time->date >> 5 ) & 0x0f );

  /* The day value is stored in bits 0 - 4 of the date (5 bits)

   */

  date_time_values->day = (uint8_t) ( internal_fat_date_time->date & 0x1f );

  /* The hours value is stored in bits 11 - 15 of the time (5 bits)

   */

  date_time_values->hours = (uint8_t) ( ( internal_fat_date_time->time >> 11 ) & 0x1f );

  /* The minutes value is stored in bits 5 - 10 of the time (6 bits)

   */

  date_time_values->minutes = (uint8_t) ( ( internal_fat_date_time->time >> 5 ) & 0x3f );

  /* The seconds value is stored in bits 0 - 4 of the time (5 bits)

   * The seconds are stored as 2 second intervals

   */

  date_time_values->seconds = (uint8_t) ( internal_fat_date_time->time & 0x1f ) * 2;

        date_time_values->milli_seconds = 0;

        date_time_values->micro_seconds = 0;

        date_time_values->nano_seconds  = 0;

  return( 1 );

}

/* Deterimes the size of the string for the FAT date time

 * The string size includes the end of string character

 * Returns 1 if successful or -1 on error

 */

int libfdatetime_fat_date_time_get_string_size(

     libfdatetime_fat_date_time_t *fat_date_time,

     size_t *string_size,

     uint32_t string_format_flags,

     libcerror_error_t **error )

{

  libfdatetime_date_time_values_t date_time_values;

  static char *function = "libfdatetime_fat_date_time_get_string_size";

  int result            = 0;

  if( fat_date_time == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid FAT date time.",

     function );

    return( -1 );

  }

  if( string_size == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid string size.",

     function );

    return( -1 );

  }

  result = libfdatetime_internal_fat_date_time_copy_to_date_time_values(

            (libfdatetime_internal_fat_date_time_t *) fat_date_time,

            &date_time_values,

            error );

  if( result != 1 )

  {

#if defined( HAVE_DEBUG_OUTPUT )

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_SET_FAILED,

     "%s: unable to set date time values.",

     function );

/* TODO debug print error */

#endif /* defined( HAVE_DEBUG_OUTPUT ) */

    if( ( error != NULL )

     && ( *error != NULL ) )

    {

      libcerror_error_free(

       error );

    }

  }

  else

  {

    result = libfdatetime_date_time_values_get_string_size(

              &date_time_values,

              string_size,

              string_format_flags,

              error );

    if( result == -1 )

    {

      libcerror_error_set(

       error,

       LIBCERROR_ERROR_DOMAIN_RUNTIME,

       LIBCERROR_RUNTIME_ERROR_GET_FAILED,

       "%s: unable to get string size.",

       function );

      return( -1 );

    }

  }

  if( result != 1 )

  {

    /* Make sure the string can hold the hexadecimal representation of the FAT date time

     */

    *string_size = 16;

  }

  return( 1 );

}

/* Converts the FAT date and time into an UTF-8 string in hexadecimal representation

 * The string size should include the end of string character

 * Returns 1 if successful or -1 on error

 */

int libfdatetime_internal_fat_date_time_copy_to_utf8_string_in_hexadecimal(

     libfdatetime_internal_fat_date_time_t *internal_fat_date_time,

     uint8_t *utf8_string,

     size_t utf8_string_size,

     size_t *utf8_string_index,

     libcerror_error_t **error )

{

  static char *function = "libfdatetime_internal_fat_date_time_copy_to_utf8_string_in_hexadecimal";

  size_t string_index   = 0;

  uint8_t byte_value    = 0;

  int8_t byte_shift     = 0;

  if( internal_fat_date_time == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid FAT date time.",

     function );

    return( -1 );

  }

  if( utf8_string == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid UTF-8 string.",

     function );

    return( -1 );

  }

  if( utf8_string_size > (size_t) SSIZE_MAX )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_VALUE_EXCEEDS_MAXIMUM,

     "%s: invalid UTF-8 string size value exceeds maximum.",

     function );

    return( -1 );

  }

  if( utf8_string_index == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid UTF-8 string index.",

     function );

    return( -1 );

  }

  if( ( utf8_string_size < 16 )

   || ( *utf8_string_index > ( utf8_string_size - 16 ) ) )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_VALUE_TOO_SMALL,

     "%s: UTF-8 string is too small.",

     function );

    return( -1 );

  }

  string_index = *utf8_string_index;

  utf8_string[ string_index++ ] = (uint8_t) '(';

  utf8_string[ string_index++ ] = (uint8_t) '0';

  utf8_string[ string_index++ ] = (uint8_t) 'x';

  byte_shift = 12;

  do

  {

    byte_value = ( internal_fat_date_time->date >> byte_shift ) & 0x0f;

    if( byte_value <= 9 )

    {

      utf8_string[ string_index++ ] = (uint8_t) '0' + byte_value;

    }

    else

    {

      utf8_string[ string_index++ ] = (uint8_t) 'a' + byte_value - 10;

    }

    byte_shift -= 4;

  }

  while( byte_shift >= 0 );

  utf8_string[ string_index++ ] = (uint8_t) ' ';

  utf8_string[ string_index++ ] = (uint8_t) '0';

  utf8_string[ string_index++ ] = (uint8_t) 'x';

  byte_shift = 12;

  do

  {

    byte_value = ( internal_fat_date_time->time >> byte_shift ) & 0x0f;

    if( byte_value <= 9 )

    {

      utf8_string[ string_index++ ] = (uint8_t) '0' + byte_value;

    }

    else

    {

      utf8_string[ string_index++ ] = (uint8_t) 'a' + byte_value - 10;

    }

    byte_shift -= 4;

  }

  while( byte_shift >= 0 );

  utf8_string[ string_index++ ] = (uint8_t) ')';

  utf8_string[ string_index++ ] = 0;

  *utf8_string_index = string_index;

  return( 1 );

}

/* Converts the FAT date and time into an UTF-8 string

 * The string size should include the end of string character

 * Returns 1 if successful or -1 on error

 */

int libfdatetime_fat_date_time_copy_to_utf8_string(

     libfdatetime_fat_date_time_t *fat_date_time,

     uint8_t *utf8_string,

     size_t utf8_string_size,

     uint32_t string_format_flags,

     libcerror_error_t **error )

{

  static char *function    = "libfdatetime_fat_date_time_copy_to_utf8_string";

  size_t utf8_string_index = 0;

  if( libfdatetime_fat_date_time_copy_to_utf8_string_with_index(

       fat_date_time,

       utf8_string,

       utf8_string_size,

       &utf8_string_index,

       string_format_flags,

       error ) != 1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_COPY_FAILED,

     "%s: unable to copy FAT date time to UTF-8 string.",

     function );

    return( -1 );

  }

  return( 1 );

}

/* Converts the FAT date and time into an UTF-8 string

 * The string size should include the end of string character

 * Returns 1 if successful or -1 on error

 */

int libfdatetime_fat_date_time_copy_to_utf8_string_with_index(

     libfdatetime_fat_date_time_t *fat_date_time,

     uint8_t *utf8_string,

     size_t utf8_string_size,

     size_t *utf8_string_index,

     uint32_t string_format_flags,

     libcerror_error_t **error )

{

  libfdatetime_date_time_values_t date_time_values;

  libfdatetime_internal_fat_date_time_t *internal_fat_date_time = NULL;

  static char *function                                         = "libfdatetime_fat_date_time_copy_to_utf8_string_with_index";

  int result                                                    = 0;

  if( fat_date_time == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid FAT date time.",

     function );

    return( -1 );

  }

  internal_fat_date_time = (libfdatetime_internal_fat_date_time_t *) fat_date_time;

  result = libfdatetime_internal_fat_date_time_copy_to_date_time_values(

            internal_fat_date_time,

            &date_time_values,

            error );

  if( result != 1 )

  {

#if defined( HAVE_DEBUG_OUTPUT )

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_SET_FAILED,

     "%s: unable to set date time values.",

     function );

/* TODO debug print error */

#endif /* defined( HAVE_DEBUG_OUTPUT ) */

    if( ( error != NULL )

     && ( *error != NULL ) )

    {

      libcerror_error_free(

       error );

    }

  }

  else

  {

    result = libfdatetime_date_time_values_copy_to_utf8_string_with_index(

              &date_time_values,

              utf8_string,

              utf8_string_size,

              utf8_string_index,

              string_format_flags,

              error );

    if( result == -1 )

    {

      libcerror_error_set(

       error,

       LIBCERROR_ERROR_DOMAIN_RUNTIME,

       LIBCERROR_RUNTIME_ERROR_SET_FAILED,

       "%s: unable to copy date time values to UTF-8 string.",

       function );

      return( -1 );

    }

  }

  if( result != 1 )

  {

    result = libfdatetime_internal_fat_date_time_copy_to_utf8_string_in_hexadecimal(

              internal_fat_date_time,

              utf8_string,

              utf8_string_size,

              utf8_string_index,

              error );

    if( result == -1 )

    {

      libcerror_error_set(

       error,

       LIBCERROR_ERROR_DOMAIN_RUNTIME,

       LIBCERROR_RUNTIME_ERROR_SET_FAILED,

       "%s: unable to FAT date time values to hexadecimal UTF-8 string.",

       function );

      return( -1 );

    }

  }

  return( 1 );

}

/* Converts the FAT date and time into an UTF-16 string in hexadecimal representation

 * The string size should include the end of string character

 * Returns 1 if successful or -1 on error

 */

int libfdatetime_internal_fat_date_time_copy_to_utf16_string_in_hexadecimal(

     libfdatetime_internal_fat_date_time_t *internal_fat_date_time,

     uint16_t *utf16_string,

     size_t utf16_string_size,

     size_t *utf16_string_index,

     libcerror_error_t **error )

{

  static char *function = "libfdatetime_internal_fat_date_time_copy_to_utf16_string_in_hexadecimal";

  size_t string_index   = 0;

  uint8_t byte_value    = 0;

  int8_t byte_shift     = 0;

  if( internal_fat_date_time == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid FAT date time.",

     function );

    return( -1 );

  }

  if( utf16_string == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid UTF-16 string.",

     function );

    return( -1 );

  }

  if( utf16_string_size > (size_t) SSIZE_MAX )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_VALUE_EXCEEDS_MAXIMUM,

     "%s: invalid UTF-16 string size value exceeds maximum.",

     function );

    return( -1 );

  }

  if( utf16_string_index == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid UTF-16 string index.",

     function );

    return( -1 );

  }

  if( ( utf16_string_size < 16 )

   || ( *utf16_string_index > ( utf16_string_size - 16 ) ) )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_VALUE_TOO_SMALL,

     "%s: UTF-16 string is too small.",

     function );

    return( -1 );

  }

  string_index = *utf16_string_index;

  utf16_string[ string_index++ ] = (uint16_t) '(';

  utf16_string[ string_index++ ] = (uint16_t) '0';

  utf16_string[ string_index++ ] = (uint16_t) 'x';

  byte_shift = 12;

  do

  {

    byte_value = ( internal_fat_date_time->date >> byte_shift ) & 0x0f;

    if( byte_value <= 9 )

    {

      utf16_string[ string_index++ ] = (uint16_t) '0' + byte_value;

    }

    else

    {

      utf16_string[ string_index++ ] = (uint16_t) 'a' + byte_value - 10;

    }

    byte_shift -= 4;

  }

  while( byte_shift >= 0 );

  utf16_string[ string_index++ ] = (uint16_t) ' ';

  utf16_string[ string_index++ ] = (uint16_t) '0';

  utf16_string[ string_index++ ] = (uint16_t) 'x';

  byte_shift = 12;

  do

  {

    byte_value = ( internal_fat_date_time->time >> byte_shift ) & 0x0f;

    if( byte_value <= 9 )

    {

      utf16_string[ string_index++ ] = (uint16_t) '0' + byte_value;

    }

    else

    {

      utf16_string[ string_index++ ] = (uint16_t) 'a' + byte_value - 10;

    }

    byte_shift -= 4;

  }

  while( byte_shift >= 0 );

  utf16_string[ string_index++ ] = (uint16_t) ')';

  utf16_string[ string_index++ ] = 0;

  *utf16_string_index = string_index;

  return( 1 );

}

/* Converts the FAT date and time into an UTF-16 string

 * The string size should include the end of string character

 * Returns 1 if successful or -1 on error

 */

int libfdatetime_fat_date_time_copy_to_utf16_string(

     libfdatetime_fat_date_time_t *fat_date_time,

     uint16_t *utf16_string,

     size_t utf16_string_size,

     uint32_t string_format_flags,

     libcerror_error_t **error )

{

  static char *function     = "libfdatetime_fat_date_time_copy_to_utf16_string";

  size_t utf16_string_index = 0;

  if( libfdatetime_fat_date_time_copy_to_utf16_string_with_index(

       fat_date_time,

       utf16_string,

       utf16_string_size,

       &utf16_string_index,

       string_format_flags,

       error ) != 1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_COPY_FAILED,

     "%s: unable to copy FAT date time to UTF-16 string.",

     function );

    return( -1 );

  }

  return( 1 );

}

/* Converts the FAT date and time into an UTF-16 string

 * The string size should include the end of string character

 * Returns 1 if successful or -1 on error

 */

int libfdatetime_fat_date_time_copy_to_utf16_string_with_index(

     libfdatetime_fat_date_time_t *fat_date_time,

     uint16_t *utf16_string,

     size_t utf16_string_size,

     size_t *utf16_string_index,

     uint32_t string_format_flags,

     libcerror_error_t **error )

{

  libfdatetime_date_time_values_t date_time_values;

  libfdatetime_internal_fat_date_time_t *internal_fat_date_time = NULL;

  static char *function                                         = "libfdatetime_fat_date_time_copy_to_utf16_string_with_index";

  int result                                                    = 0;

  if( fat_date_time == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid FAT date time.",