xref: /openbmc/linux/drivers/acpi/acpica/utuuid.c (revision 73bbca04)

/******************************************************************************
 *
 * Module Name: utuuid -- UUID support functions
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2014, Intel Corp.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#include <acpi/acpi.h>
#include "accommon.h"

#define _COMPONENT          ACPI_COMPILER
ACPI_MODULE_NAME("utuuid")

/*
 * UUID support functions.
 *
 * This table is used to convert an input UUID ascii string to a 16 byte
 * buffer and the reverse. The table maps a UUID buffer index 0-15 to
 * the index within the 36-byte UUID string where the associated 2-byte
 * hex value can be found.
 *
 * 36-byte UUID strings are of the form:
 *     aabbccdd-eeff-gghh-iijj-kkllmmnnoopp
 * Where aa-pp are one byte hex numbers, made up of two hex digits
 *
 * Note: This table is basically the inverse of the string-to-offset table
 * found in the ACPI spec in the description of the to_UUID macro.
 */
const u8 acpi_gbl_map_to_uuid_offset[UUID_BUFFER_LENGTH] = {
	6, 4, 2, 0, 11, 9, 16, 14, 19, 21, 24, 26, 28, 30, 32, 34
};

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_convert_string_to_uuid
 *
 * PARAMETERS:  in_string           - 36-byte formatted UUID string
 *              uuid_buffer         - Where the 16-byte UUID buffer is returned
 *
 * RETURN:      None. Output data is returned in the uuid_buffer
 *
 * DESCRIPTION: Convert a 36-byte formatted UUID string to 16-byte UUID buffer
 *
 ******************************************************************************/

void acpi_ut_convert_string_to_uuid(char *in_string, u8 *uuid_buffer)
{
	u32 i;

	for (i = 0; i < UUID_BUFFER_LENGTH; i++) {
		uuid_buffer[i] =
		    (acpi_ut_ascii_char_to_hex
		     (in_string[acpi_gbl_map_to_uuid_offset[i]]) << 4);

		uuid_buffer[i] |=
		    acpi_ut_ascii_char_to_hex(in_string
					      [acpi_gbl_map_to_uuid_offset[i] +
					       1]);
	}
}