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 - 2019, Intel Corp.
7 *
8 *****************************************************************************/
9
10 #include <acpi/acpi.h>
11 #include "accommon.h"
12
13 #define _COMPONENT ACPI_COMPILER
14 ACPI_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 */
32 const 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
49 void 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