106 lines
3.2 KiB
C
106 lines
3.2 KiB
C
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/******************************************************************************
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*
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* Module Name: utuuid -- UUID support functions
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*
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* Copyright (C) 2000 - 2022, Intel Corp.
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*
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*****************************************************************************/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#define _COMPONENT ACPI_COMPILER
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ACPI_MODULE_NAME("utuuid")
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#if (defined ACPI_ASL_COMPILER || defined ACPI_EXEC_APP || defined ACPI_HELP_APP)
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/*
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* UUID support functions.
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*
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* This table is used to convert an input UUID ascii string to a 16 byte
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* buffer and the reverse. The table maps a UUID buffer index 0-15 to
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* the index within the 36-byte UUID string where the associated 2-byte
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* hex value can be found.
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*
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* 36-byte UUID strings are of the form:
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* aabbccdd-eeff-gghh-iijj-kkllmmnnoopp
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* Where aa-pp are one byte hex numbers, made up of two hex digits
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*
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* Note: This table is basically the inverse of the string-to-offset table
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* found in the ACPI spec in the description of the to_UUID macro.
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*/
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const u8 acpi_gbl_map_to_uuid_offset[UUID_BUFFER_LENGTH] = {
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6, 4, 2, 0, 11, 9, 16, 14, 19, 21, 24, 26, 28, 30, 32, 34
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};
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_convert_string_to_uuid
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*
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* PARAMETERS: in_string - 36-byte formatted UUID string
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* uuid_buffer - Where the 16-byte UUID buffer is returned
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*
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* RETURN: None. Output data is returned in the uuid_buffer
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*
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* DESCRIPTION: Convert a 36-byte formatted UUID string to 16-byte UUID buffer
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*
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******************************************************************************/
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void acpi_ut_convert_string_to_uuid(char *in_string, u8 *uuid_buffer)
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{
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u32 i;
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for (i = 0; i < UUID_BUFFER_LENGTH; i++) {
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uuid_buffer[i] =
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(acpi_ut_ascii_char_to_hex
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(in_string[acpi_gbl_map_to_uuid_offset[i]]) << 4);
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uuid_buffer[i] |=
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acpi_ut_ascii_char_to_hex(in_string
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[acpi_gbl_map_to_uuid_offset[i] +
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1]);
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_convert_uuid_to_string
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*
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* PARAMETERS: uuid_buffer - 16-byte UUID buffer
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* out_string - 36-byte formatted UUID string
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*
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* RETURN: Status
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*
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* DESCRIPTION: Convert 16-byte UUID buffer to 36-byte formatted UUID string
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* out_string must be 37 bytes to include null terminator.
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*
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******************************************************************************/
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acpi_status acpi_ut_convert_uuid_to_string(char *uuid_buffer, char *out_string)
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{
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u32 i;
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if (!uuid_buffer || !out_string) {
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return (AE_BAD_PARAMETER);
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}
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for (i = 0; i < UUID_BUFFER_LENGTH; i++) {
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out_string[acpi_gbl_map_to_uuid_offset[i]] =
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acpi_ut_hex_to_ascii_char(uuid_buffer[i], 4);
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out_string[acpi_gbl_map_to_uuid_offset[i] + 1] =
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acpi_ut_hex_to_ascii_char(uuid_buffer[i], 0);
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}
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/* Insert required hyphens (dashes) */
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out_string[UUID_HYPHEN1_OFFSET] =
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out_string[UUID_HYPHEN2_OFFSET] =
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out_string[UUID_HYPHEN3_OFFSET] =
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out_string[UUID_HYPHEN4_OFFSET] = '-';
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out_string[UUID_STRING_LENGTH] = 0; /* Null terminate */
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return (AE_OK);
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}
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#endif
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