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 - 2022, 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 65 /******************************************************************************* 66 * 67 * FUNCTION: acpi_ut_convert_uuid_to_string 68 * 69 * PARAMETERS: uuid_buffer - 16-byte UUID buffer 70 * out_string - 36-byte formatted UUID string 71 * 72 * RETURN: Status 73 * 74 * DESCRIPTION: Convert 16-byte UUID buffer to 36-byte formatted UUID string 75 * out_string must be 37 bytes to include null terminator. 76 * 77 ******************************************************************************/ 78 79 acpi_status acpi_ut_convert_uuid_to_string(char *uuid_buffer, char *out_string) 80 { 81 u32 i; 82 83 if (!uuid_buffer || !out_string) { 84 return (AE_BAD_PARAMETER); 85 } 86 87 for (i = 0; i < UUID_BUFFER_LENGTH; i++) { 88 out_string[acpi_gbl_map_to_uuid_offset[i]] = 89 acpi_ut_hex_to_ascii_char(uuid_buffer[i], 4); 90 91 out_string[acpi_gbl_map_to_uuid_offset[i] + 1] = 92 acpi_ut_hex_to_ascii_char(uuid_buffer[i], 0); 93 } 94 95 /* Insert required hyphens (dashes) */ 96 97 out_string[UUID_HYPHEN1_OFFSET] = 98 out_string[UUID_HYPHEN2_OFFSET] = 99 out_string[UUID_HYPHEN3_OFFSET] = 100 out_string[UUID_HYPHEN4_OFFSET] = '-'; 101 102 out_string[UUID_STRING_LENGTH] = 0; /* Null terminate */ 103 return (AE_OK); 104 } 105 #endif 106