// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
*
* Module Name : utuuid - - UUID support functions
*
* Copyright ( C ) 2000 - 2025 , 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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