1 /*
2 * Copyright (C) 2019 The Android Open Source Project
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining
5 * a copy of this software and associated documentation files
6 * (the "Software"), to deal in the Software without restriction,
7 * including without limitation the rights to use, copy, modify, merge,
8 * publish, distribute, sublicense, and/or sell copies of the Software,
9 * and to permit persons to whom the Software is furnished to do so,
10 * subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be
13 * included in all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
18 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
19 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
20 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
21 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22 */
23
24 #include <inttypes.h>
25 #include <stdbool.h>
26 #include <stdio.h>
27 #include <string.h>
28 #include <trusty/uuid.h>
29
uuid_to_str(const struct uuid * uuid,char * str)30 void uuid_to_str(const struct uuid* uuid, char* str) {
31 sprintf(str,
32 "%08" PRIx32 "-%04" PRIx16 "-%04" PRIx16 "-%02" PRIx8 "%02" PRIx8
33 "-%02" PRIx8 "%02" PRIx8 "%02" PRIx8 "%02" PRIx8 "%02" PRIx8
34 "%02" PRIx8,
35 uuid->time_low, uuid->time_mid, uuid->time_hi_and_version,
36 uuid->clock_seq_and_node[0], uuid->clock_seq_and_node[1],
37 uuid->clock_seq_and_node[2], uuid->clock_seq_and_node[3],
38 uuid->clock_seq_and_node[4], uuid->clock_seq_and_node[5],
39 uuid->clock_seq_and_node[6], uuid->clock_seq_and_node[7]);
40 }
41
parse_dash(const char ** str)42 static bool parse_dash(const char** str) {
43 if (**str != '-') {
44 return false;
45 }
46
47 *str += 1;
48 return true;
49 }
50
parse_hex_digit(const char ** str,uint8_t * dst)51 static bool parse_hex_digit(const char** str, uint8_t* dst) {
52 char c;
53
54 c = **str;
55 *str += 1;
56
57 if (c >= '0' && c <= '9') {
58 *dst = c - '0';
59 return true;
60 }
61
62 if (c >= 'a' && c <= 'f') {
63 *dst = c - 'a' + 10;
64 return true;
65 }
66
67 return false;
68 }
69
parse_u8(const char ** str,uint8_t * dst)70 static bool parse_u8(const char** str, uint8_t* dst) {
71 uint8_t msn;
72 uint8_t lsn;
73
74 if (!parse_hex_digit(str, &msn)) {
75 return false;
76 }
77
78 if (!parse_hex_digit(str, &lsn)) {
79 return false;
80 }
81
82 *dst = (msn << 4) + lsn;
83 return true;
84 }
85
parse_u16(const char ** str,uint16_t * dst)86 static bool parse_u16(const char** str, uint16_t* dst) {
87 uint8_t msb;
88 uint8_t lsb;
89
90 if (!parse_u8(str, &msb)) {
91 return false;
92 }
93
94 if (!parse_u8(str, &lsb)) {
95 return false;
96 }
97
98 *dst = ((uint16_t)msb << 8) + lsb;
99 return true;
100 }
101
parse_u32(const char ** str,uint32_t * dst)102 static bool parse_u32(const char** str, uint32_t* dst) {
103 uint16_t msh;
104 uint16_t lsh;
105
106 if (!parse_u16(str, &msh)) {
107 return false;
108 }
109
110 if (!parse_u16(str, &lsh)) {
111 return false;
112 }
113
114 *dst = ((uint32_t)msh << 16) + lsh;
115 return true;
116 }
117
str_to_uuid(const char * str,struct uuid * uuid)118 int str_to_uuid(const char* str, struct uuid* uuid) {
119 int len;
120
121 len = strnlen(str, UUID_STR_SIZE);
122 if (len == UUID_STR_SIZE) {
123 return -1;
124 }
125
126 if (!parse_u32(&str, &uuid->time_low)) {
127 return -1;
128 }
129
130 if (!parse_dash(&str)) {
131 return -1;
132 }
133
134 if (!parse_u16(&str, &uuid->time_mid)) {
135 return -1;
136 }
137
138 if (!parse_dash(&str)) {
139 return -1;
140 }
141
142 if (!parse_u16(&str, &uuid->time_hi_and_version)) {
143 return -1;
144 }
145
146 if (!parse_dash(&str)) {
147 return -1;
148 }
149
150 if (!parse_u8(&str, uuid->clock_seq_and_node)) {
151 return -1;
152 }
153
154 if (!parse_u8(&str, uuid->clock_seq_and_node + 1)) {
155 return -1;
156 }
157
158 if (!parse_dash(&str)) {
159 return -1;
160 }
161
162 for (int i = 2; i < 8; i++) {
163 if (!parse_u8(&str, uuid->clock_seq_and_node + i)) {
164 return -1;
165 }
166 }
167
168 return 0;
169 }
170