drivers/acpi/acpica/utuuid.c

   1 /******************************************************************************
   2  *
   3  * Module Name: utuuid -- UUID support functions
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2018, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46
  47 #define _COMPONENT          ACPI_COMPILER
  48 ACPI_MODULE_NAME("utuuid")
  49
  50 #if (defined ACPI_ASL_COMPILER || defined ACPI_EXEC_APP || defined ACPI_HELP_APP)
  51 /*
  52  * UUID support functions.
  53  *
  54  * This table is used to convert an input UUID ascii string to a 16 byte
  55  * buffer and the reverse. The table maps a UUID buffer index 0-15 to
  56  * the index within the 36-byte UUID string where the associated 2-byte
  57  * hex value can be found.
  58  *
  59  * 36-byte UUID strings are of the form:
  60  *     aabbccdd-eeff-gghh-iijj-kkllmmnnoopp
  61  * Where aa-pp are one byte hex numbers, made up of two hex digits
  62  *
  63  * Note: This table is basically the inverse of the string-to-offset table
  64  * found in the ACPI spec in the description of the to_UUID macro.
  65  */
  66 const u8 acpi_gbl_map_to_uuid_offset[UUID_BUFFER_LENGTH] = {
  67         6, 4, 2, 0, 11, 9, 16, 14, 19, 21, 24, 26, 28, 30, 32, 34
  68 };
  69
  70 /*******************************************************************************
  71  *
  72  * FUNCTION:    acpi_ut_convert_string_to_uuid
  73  *
  74  * PARAMETERS:  in_string           - 36-byte formatted UUID string
  75  *              uuid_buffer         - Where the 16-byte UUID buffer is returned
  76  *
  77  * RETURN:      None. Output data is returned in the uuid_buffer
  78  *
  79  * DESCRIPTION: Convert a 36-byte formatted UUID string to 16-byte UUID buffer
  80  *
  81  ******************************************************************************/
  82
  83 void acpi_ut_convert_string_to_uuid(char *in_string, u8 *uuid_buffer)
  84 {
  85         u32 i;
  86
  87         for (i = 0; i < UUID_BUFFER_LENGTH; i++) {
  88                 uuid_buffer[i] =
  89                     (acpi_ut_ascii_char_to_hex
  90                      (in_string[acpi_gbl_map_to_uuid_offset[i]]) << 4);
  91
  92                 uuid_buffer[i] |=
  93                     acpi_ut_ascii_char_to_hex(in_string
  94                                               [acpi_gbl_map_to_uuid_offset[i] +
  95                                                1]);
  96         }
  97 }
  98 #endif