1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
 2/******************************************************************************
 3 *
 4 * Module Name: utuuid -- UUID support functions
 5 *
 6 * Copyright (C) 2000 - 2020, Intel Corp.
 7 *
 8 *****************************************************************************/
 9
10#include <acpi/acpi.h>
11#include "accommon.h"
12
13#define _COMPONENT          ACPI_COMPILER
14ACPI_MODULE_NAME("utuuid")
15
16#if (defined ACPI_ASL_COMPILER || defined ACPI_EXEC_APP || defined ACPI_HELP_APP)
17/*
18 * UUID support functions.
19 *
20 * This table is used to convert an input UUID ascii string to a 16 byte
21 * buffer and the reverse. The table maps a UUID buffer index 0-15 to
22 * the index within the 36-byte UUID string where the associated 2-byte
23 * hex value can be found.
24 *
25 * 36-byte UUID strings are of the form:
26 *     aabbccdd-eeff-gghh-iijj-kkllmmnnoopp
27 * Where aa-pp are one byte hex numbers, made up of two hex digits
28 *
29 * Note: This table is basically the inverse of the string-to-offset table
30 * found in the ACPI spec in the description of the to_UUID macro.
31 */
32const u8 acpi_gbl_map_to_uuid_offset[UUID_BUFFER_LENGTH] = {
33	6, 4, 2, 0, 11, 9, 16, 14, 19, 21, 24, 26, 28, 30, 32, 34
34};
35
36/*******************************************************************************
37 *
38 * FUNCTION:    acpi_ut_convert_string_to_uuid
39 *
40 * PARAMETERS:  in_string           - 36-byte formatted UUID string
41 *              uuid_buffer         - Where the 16-byte UUID buffer is returned
42 *
43 * RETURN:      None. Output data is returned in the uuid_buffer
44 *
45 * DESCRIPTION: Convert a 36-byte formatted UUID string to 16-byte UUID buffer
46 *
47 ******************************************************************************/
48
49void acpi_ut_convert_string_to_uuid(char *in_string, u8 *uuid_buffer)
50{
51	u32 i;
52
53	for (i = 0; i < UUID_BUFFER_LENGTH; i++) {
54		uuid_buffer[i] =
55		    (acpi_ut_ascii_char_to_hex
56		     (in_string[acpi_gbl_map_to_uuid_offset[i]]) << 4);
57
58		uuid_buffer[i] |=
59		    acpi_ut_ascii_char_to_hex(in_string
60					      [acpi_gbl_map_to_uuid_offset[i] +
61					       1]);
62	}
63}
64#endif