libewf_header_values.c

sleuthit-2.09 一个磁盘的工具集

	}
	if( date_element_count != 6 )
	{
		LIBEWF_WARNING_PRINT( "libewf_convert_date_header_value: unsupported amount of date elements in header value.\n" );

		libewf_common_free( date_string );
		libewf_string_split_values_free( date_elements, date_element_count );

		return( NULL );
	}
	/* Set first value
	 */
	if( date_format == LIBEWF_DATE_FORMAT_MONTHDAY )
	{
		if( libewf_date_string_set_month( &date_string[ date_string_iterator ], date_elements ) == -1 )
		{
			LIBEWF_WARNING_PRINT( "libewf_convert_date_header_value: unable to set month value.\n" );

			libewf_common_free( date_string );
			libewf_string_split_values_free( date_elements, date_element_count );

			return( NULL );
		}
		date_string_iterator += 2;
	}
	else if( date_format == LIBEWF_DATE_FORMAT_DAYMONTH )
	{
		if( libewf_date_string_set_day_of_month( &date_string[ date_string_iterator ], date_elements ) == -1 )
		{
			LIBEWF_WARNING_PRINT( "libewf_convert_date_header_value: unable to set day of the month value.\n" );

			libewf_common_free( date_string );
			libewf_string_split_values_free( date_elements, date_element_count );

			return( NULL );
		}
		date_string_iterator += 2;
	}
	else if( date_format == LIBEWF_DATE_FORMAT_ISO8601 )
	{
		if( libewf_date_string_set_year( &date_string[ date_string_iterator ], date_elements ) == -1 )
		{
			LIBEWF_WARNING_PRINT( "libewf_convert_date_header_value: unable to set year value.\n" );

			libewf_common_free( date_string );
			libewf_string_split_values_free( date_elements, date_element_count );

			return( NULL );
		}
		date_string_iterator += 4;
	}
	/* Set first seperator
	 */
	if( ( date_format == LIBEWF_DATE_FORMAT_DAYMONTH )
	 || ( date_format == LIBEWF_DATE_FORMAT_MONTHDAY ) )
	{
		date_string[ date_string_iterator ] = '/';

		date_string_iterator++;
	}
	else if( date_format == LIBEWF_DATE_FORMAT_ISO8601 )
	{
		date_string[ date_string_iterator ] = '-';

		date_string_iterator++;
	}
	/* Set second value
	 */
	if( date_format == LIBEWF_DATE_FORMAT_MONTHDAY )
	{
		if( libewf_date_string_set_day_of_month( &date_string[ date_string_iterator ], date_elements ) == -1 )
		{
			LIBEWF_WARNING_PRINT( "libewf_convert_date_header_value: unable to set day of the month value.\n" );

			libewf_common_free( date_string );
			libewf_string_split_values_free( date_elements, date_element_count );

			return( NULL );
		}
		date_string_iterator += 2;
	}
	else if( ( date_format == LIBEWF_DATE_FORMAT_DAYMONTH )
	 || ( date_format == LIBEWF_DATE_FORMAT_ISO8601 ) )
	{
		if( libewf_date_string_set_month( &date_string[ date_string_iterator ], date_elements ) == -1 )
		{
			LIBEWF_WARNING_PRINT( "libewf_convert_date_header_value: unable to set month value.\n" );

			libewf_common_free( date_string );
			libewf_string_split_values_free( date_elements, date_element_count );

			return( NULL );
		}
		date_string_iterator += 2;
	}
	/* Set second seperator
	 */
	if( ( date_format == LIBEWF_DATE_FORMAT_DAYMONTH )
	 || ( date_format == LIBEWF_DATE_FORMAT_MONTHDAY ) )
	{
		date_string[ date_string_iterator ] = '/';

		date_string_iterator++;
	}
	else if( date_format == LIBEWF_DATE_FORMAT_ISO8601 )
	{
		date_string[ date_string_iterator ] = '-';

		date_string_iterator++;
	}
	/* Set third value
	 */
	if( ( date_format == LIBEWF_DATE_FORMAT_DAYMONTH )
	 || ( date_format == LIBEWF_DATE_FORMAT_MONTHDAY ) )
	{
		if( libewf_date_string_set_year( &date_string[ date_string_iterator ], date_elements ) == -1 )
		{
			LIBEWF_WARNING_PRINT( "libewf_convert_date_header_value: unable to set year value.\n" );

			libewf_common_free( date_string );
			libewf_string_split_values_free( date_elements, date_element_count );

			return( NULL );
		}
		date_string_iterator += 4;
	}
	else if( date_format == LIBEWF_DATE_FORMAT_ISO8601 )
	{
		if( libewf_date_string_set_day_of_month( &date_string[ date_string_iterator ], date_elements ) == -1 )
		{
			LIBEWF_WARNING_PRINT( "libewf_convert_date_header_value: unable to set day of the month value.\n" );

			libewf_common_free( date_string );
			libewf_string_split_values_free( date_elements, date_element_count );

			return( NULL );
		}
		date_string_iterator += 2;
	}
	/* Set third seperator
	 */
	if( ( date_format == LIBEWF_DATE_FORMAT_DAYMONTH )
	 || ( date_format == LIBEWF_DATE_FORMAT_MONTHDAY ) )
	{
		date_string[ date_string_iterator ] = ' ';

		date_string_iterator++;
	}
	else if( date_format == LIBEWF_DATE_FORMAT_ISO8601 )
	{
		date_string[ date_string_iterator ] = 'T';

		date_string_iterator++;
	}
	/* Set fourth value
	 */
	if( libewf_date_string_set_hours( &date_string[ date_string_iterator ], date_elements ) == -1 )
	{
		LIBEWF_WARNING_PRINT( "libewf_convert_date_header_value: unable to set hours value.\n" );

		libewf_common_free( date_string );
		libewf_string_split_values_free( date_elements, date_element_count );

		return( NULL );
	}
	date_string_iterator += 2;

	/* Set fourth seperator
	 */
	date_string[ date_string_iterator ] = ':';

	date_string_iterator++;

	/* Set fifth value
	 */
	if( libewf_date_string_set_minutes( &date_string[ date_string_iterator ], date_elements ) == -1 )
	{
		LIBEWF_WARNING_PRINT( "libewf_convert_date_header_value: unable to set minutes value.\n" );

		libewf_common_free( date_string );
		libewf_string_split_values_free( date_elements, date_element_count );

		return( NULL );
	}
	date_string_iterator += 2;

	/* Set fifth seperator
	 */
	date_string[ date_string_iterator ] = ':';

	date_string_iterator++;

	/* Set sixth value
	 */
	if( libewf_date_string_set_seconds( &date_string[ date_string_iterator ], date_elements ) == -1 )
	{
		LIBEWF_WARNING_PRINT( "libewf_convert_date_header_value: unable to set seconds value.\n" );

		libewf_common_free( date_string );
		libewf_string_split_values_free( date_elements, date_element_count );

		return( NULL );
	}
	date_string_iterator += 2;

	date_string[ date_string_iterator ] = (LIBEWF_CHAR) '\0';

	libewf_string_split_values_free( date_elements, date_element_count );

	return( date_string );
}

/* Generate date string within a header value
 * Returns a pointer to the new instance, NULL on error
 */
LIBEWF_CHAR *libewf_generate_date_header_value( time_t timestamp )
{
	LIBEWF_CHAR *date_string = NULL;
	struct tm *time_elements = NULL;

	time_elements = libewf_common_localtime( &timestamp );

	if( time_elements == NULL )
	{
		LIBEWF_WARNING_PRINT( "libewf_generate_date_header_value: unable to create time elements.\n" );

		return( NULL );
	}
	date_string = (LIBEWF_CHAR *) libewf_common_alloc( LIBEWF_CHAR_SIZE * 20 );

	if( date_string == NULL )
	{
		LIBEWF_WARNING_PRINT( "libewf_generate_date_header_value: unable to create date string.\n" );

		libewf_common_free( time_elements );

		return( NULL );
	}
	if( libewf_string_snprintf( date_string, 20, _S_LIBEWF_CHAR( "%4d %d %d %d %d %d" ),
		( time_elements->tm_year + 1900 ), ( time_elements->tm_mon + 1 ), time_elements->tm_mday,
		time_elements->tm_hour, time_elements->tm_min, time_elements->tm_sec ) <= -1 )
	{
		LIBEWF_WARNING_PRINT( "libewf_generate_date_header_value: unable to fill date string.\n" );

		libewf_common_free( date_string );
		libewf_common_free( time_elements );

		return( NULL );
	}
	/* Make sure the string is terminated correctly
	 */
	date_string[ 19 ] = (LIBEWF_CHAR) '\0';

	libewf_common_free( time_elements );

	return( date_string );
}

/* Convert date string within a header2 value
 * Returns a pointer to the new instance, NULL on error
 */
LIBEWF_CHAR *libewf_convert_date_header2_value( LIBEWF_CHAR *header_value, uint8_t date_format )
{
	struct tm *time_elements = NULL;
	LIBEWF_CHAR *date_string = NULL;
	time_t timestamp         = 0;

	if( header_value == NULL )
	{
		LIBEWF_WARNING_PRINT( "libewf_convert_date_header2_value: invalid header value.\n" );

		return( NULL );
	}
	if( ( date_format != LIBEWF_DATE_FORMAT_DAYMONTH )
	 && ( date_format != LIBEWF_DATE_FORMAT_MONTHDAY )
	 && ( date_format != LIBEWF_DATE_FORMAT_ISO8601 ) )
	{
		LIBEWF_WARNING_PRINT( "libewf_convert_date_header2_value: unsupported date format.\n" );

		return( NULL );
	}
	timestamp     = libewf_string_to_int64( header_value, libewf_string_length( header_value ) );
	time_elements = libewf_common_localtime( &timestamp );

	if( time_elements == NULL )
	{
		LIBEWF_WARNING_PRINT( "libewf_convert_date_header2_value: unable to create time elements.\n" );

		return( NULL );
	}
	date_string = (LIBEWF_CHAR *) libewf_common_alloc( LIBEWF_CHAR_SIZE * 20 );

	if( date_string == NULL )
	{
		LIBEWF_WARNING_PRINT( "libewf_convert_date_header2_value: unable to create date string.\n" );

		libewf_common_free( time_elements );

		return( NULL );
	}
	if( date_format == LIBEWF_DATE_FORMAT_MONTHDAY )
	{
		if( libewf_string_snprintf( date_string, 20, _S_LIBEWF_CHAR( "%02d/%02d/%04d %02d:%02d:%02d" ),
	                ( time_elements->tm_mon + 1 ), time_elements->tm_mday, ( time_elements->tm_year + 1900 ),
	                time_elements->tm_hour, time_elements->tm_min, time_elements->tm_sec ) <= -1 )
        	{
			LIBEWF_WARNING_PRINT( "libewf_convert_date_header2_value: unable to fill date string.\n" );

			libewf_common_free( time_elements );
			libewf_common_free( date_string );

			return( NULL );
		}
	}
	else if( date_format == LIBEWF_DATE_FORMAT_DAYMONTH )
	{
		if( libewf_string_snprintf( date_string, 20, _S_LIBEWF_CHAR( "%02d/%02d/%04d %02d:%02d:%02d" ),
	                time_elements->tm_mday, ( time_elements->tm_mon + 1 ), ( time_elements->tm_year + 1900 ),
	                time_elements->tm_hour, time_elements->tm_min, time_elements->tm_sec ) <= -1 )
        	{
			LIBEWF_WARNING_PRINT( "libewf_convert_date_header2_value: unable to fill date string.\n" );

			libewf_common_free( time_elements );
			libewf_common_free( date_string );

			return( NULL );
		}
	}
	else if( date_format == LIBEWF_DATE_FORMAT_ISO8601 )
	{
		if( libewf_string_snprintf( date_string, 20, _S_LIBEWF_CHAR( "%04d-%02d-%02dT%02d:%02d:%02d" ),
	                ( time_elements->tm_year + 1900 ), ( time_elements->tm_mon + 1 ), time_elements->tm_mday,
	                time_elements->tm_hour, time_elements->tm_min, time_elements->tm_sec ) <= -1 )
        	{
			LIBEWF_WARNING_PRINT( "libewf_convert_date_header2_value: unable to fill date string.\n" );

			libewf_common_free( time_elements );
			libewf_common_free( date_string );

			return( NULL );
		}
	}
	libewf_common_free( time_elements );

	return( date_string );
}

/* Generate date string within a header2 value
 * Returns a pointer to the new instance, NULL on error
 */
LIBEWF_CHAR *libewf_generate_date_header2_value( time_t timestamp )
{
	LIBEWF_CHAR *date_string = NULL;

	date_string = (LIBEWF_CHAR *) libewf_common_alloc( LIBEWF_CHAR_SIZE * 11 );

	if( date_string == NULL )
	{
		LIBEWF_WARNING_PRINT( "libewf_generate_date_header2_value: unable to create date string.\n" );

		return( NULL );
	}
	if( libewf_string_snprintf( date_string, 11, _S_LIBEWF_CHAR( "%" ) _S_LIBEWF_CHAR( PRIu32 ), (uint32_t) timestamp ) <= -1 )
	{
		LIBEWF_WARNING_PRINT( "libewf_generate_date_header2_value: unable to create date string.\n" );

		libewf_common_free( date_string );

		return( NULL );
	}
	/* Make sure the string is terminated correctly
	 */
	date_string[ 10 ] = (LIBEWF_CHAR) '\0';

	return( date_string );
}

/* Retrieves the header value index number, or -1 on error
 * The index number will be larger than the amount when the identifier is not present in the header values
 */
int32_t libewf_header_values_get_index( LIBEWF_HEADER_VALUES *header_values, LIBEWF_CHAR *identifier )
{
	size_t identifier_length = 0;
	size_t string_length     = 0;
	int32_t iterator         = 0;