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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
*
* Module Name: utuuid -- UUID support functions
*
* Copyright (C) 2000 - 2021, Intel Corp.
*
*****************************************************************************/
#include <acpi/acpi.h>
#include "accommon.h"
#define _COMPONENT ACPI_COMPILER
ACPI_MODULE_NAME("utuuid")
#if (defined ACPI_ASL_COMPILER || defined ACPI_EXEC_APP || defined ACPI_HELP_APP)
/*
* 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]);
}
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_convert_uuid_to_string
*
* PARAMETERS: uuid_buffer - 16-byte UUID buffer
* out_string - 36-byte formatted UUID string
*
* RETURN: Status
*
* DESCRIPTION: Convert 16-byte UUID buffer to 36-byte formatted UUID string
* out_string must be 37 bytes to include null terminator.
*
******************************************************************************/
acpi_status acpi_ut_convert_uuid_to_string(char *uuid_buffer, char *out_string)
{
u32 i;
if (!uuid_buffer || !out_string) {
return (AE_BAD_PARAMETER);
}
for (i = 0; i < UUID_BUFFER_LENGTH; i++) {
out_string[acpi_gbl_map_to_uuid_offset[i]] =
acpi_ut_hex_to_ascii_char(uuid_buffer[i], 4);
out_string[acpi_gbl_map_to_uuid_offset[i] + 1] =
acpi_ut_hex_to_ascii_char(uuid_buffer[i], 0);
}
/* Insert required hyphens (dashes) */
out_string[UUID_HYPHEN1_OFFSET] =
out_string[UUID_HYPHEN2_OFFSET] =
out_string[UUID_HYPHEN3_OFFSET] =
out_string[UUID_HYPHEN4_OFFSET] = '-';
out_string[UUID_STRING_LENGTH] = 0; /* Null terminate */
return (AE_OK);
}
#endif
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