source: azure_iot_hub/trunk/azure_iothub/c-utility/src/utf8_checker.c@ 389

Last change on this file since 389 was 389, checked in by coas-nagasima, 5 years ago

ビルドが通るよう更新
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  • Property svn:mime-type set to text/x-csrc;charset=UTF-8
File size: 5.7 KB
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1 // Copyright (c) Microsoft. All rights reserved.
2// Licensed under the MIT license. See LICENSE file in the project root for full license information.
3
4#ifdef __cplusplus
5#include <cstdlib>
6#include <cstddef>
7#include <cstdint>
8#else
9#include <stdlib.h>
10#include <stdbool.h>
11#include <stddef.h>
12#include <stdint.h>
13#endif
14
15#include "azure_c_shared_utility/utf8_checker.h"
16
17bool utf8_checker_is_valid_utf8(const unsigned char* utf8_str, size_t length)
18{
19 bool result;
20
21 if (utf8_str == NULL)
22 {
23 /* Codes_SRS_UTF8_CHECKER_01_002: [ If utf8_checker_is_valid_utf8 is called with NULL utf8_str it shall return false. ]*/
24 result = false;
25 }
26 else
27 {
28 size_t pos = 0;
29
30 /* Codes_SRS_UTF8_CHECKER_01_003: [ If length is 0, utf8_checker_is_valid_utf8 shall consider utf8_str to be valid UTF-8 and return true. ]*/
31 result = true;
32
33 while ((result == true) &&
34 (pos < length))
35 {
36 /* Codes_SRS_UTF8_CHECKER_01_001: [ utf8_checker_is_valid_utf8 shall verify that the sequence of chars pointed to by utf8_str represent UTF-8 encoded codepoints. ]*/
37 if ((utf8_str[pos] >> 3) == 0x1E)
38 {
39 /* 4 bytes */
40 /* Codes_SRS_UTF8_CHECKER_01_009: [ 000uuuuu zzzzyyyy yyxxxxxx 11110uuu 10uuzzzz 10yyyyyy 10xxxxxx ]*/
41 uint32_t code_point = (utf8_str[pos] & 0x07);
42
43 pos++;
44 if ((pos < length) &&
45 ((utf8_str[pos] >> 6) == 0x02))
46 {
47 code_point <<= 6;
48 code_point += utf8_str[pos] & 0x3F;
49
50 pos++;
51 if ((pos < length) &&
52 ((utf8_str[pos] >> 6) == 0x02))
53 {
54 code_point <<= 6;
55 code_point += utf8_str[pos] & 0x3F;
56
57 pos++;
58 if ((pos < length) &&
59 ((utf8_str[pos] >> 6) == 0x02))
60 {
61 code_point <<= 6;
62 code_point += utf8_str[pos] & 0x3F;
63
64 if (code_point <= 0xFFFF)
65 {
66 result = false;
67 }
68 else
69 {
70 /* Codes_SRS_UTF8_CHECKER_01_005: [ On success it shall return true. ]*/
71 result = true;
72 pos++;
73 }
74 }
75 else
76 {
77 result = false;
78 }
79 }
80 else
81 {
82 result = false;
83 }
84 }
85 else
86 {
87 result = false;
88 }
89 }
90 else if ((utf8_str[pos] >> 4) == 0x0E)
91 {
92 /* 3 bytes */
93 /* Codes_SRS_UTF8_CHECKER_01_008: [ zzzzyyyy yyxxxxxx 1110zzzz 10yyyyyy 10xxxxxx ]*/
94 uint32_t code_point = (utf8_str[pos] & 0x0F);
95
96 pos++;
97 if ((pos < length) &&
98 ((utf8_str[pos] >> 6) == 0x02))
99 {
100 code_point <<= 6;
101 code_point += utf8_str[pos] & 0x3F;
102
103 pos++;
104 if ((pos < length) &&
105 ((utf8_str[pos] >> 6) == 0x02))
106 {
107 code_point <<= 6;
108 code_point += utf8_str[pos] & 0x3F;
109
110 if (code_point <= 0x7FF)
111 {
112 result = false;
113 }
114 else
115 {
116 /* Codes_SRS_UTF8_CHECKER_01_005: [ On success it shall return true. ]*/
117 result = true;
118 pos++;
119 }
120 }
121 else
122 {
123 result = false;
124 }
125 }
126 else
127 {
128 result = false;
129 }
130 }
131 else if ((utf8_str[pos] >> 5) == 0x06)
132 {
133 /* 2 bytes */
134 /* Codes_SRS_UTF8_CHECKER_01_007: [ 00000yyy yyxxxxxx 110yyyyy 10xxxxxx ]*/
135 uint32_t code_point = (utf8_str[pos] & 0x1F);
136
137 pos++;
138 if ((pos < length) &&
139 ((utf8_str[pos] >> 6) == 0x02))
140 {
141 code_point <<= 6;
142 code_point += utf8_str[pos] & 0x3F;
143
144 if (code_point <= 0x7F)
145 {
146 result = false;
147 }
148 else
149 {
150 /* Codes_SRS_UTF8_CHECKER_01_005: [ On success it shall return true. ]*/
151 result = true;
152 pos++;
153 }
154 }
155 else
156 {
157 result = false;
158 }
159 }
160 else if ((utf8_str[pos] >> 7) == 0x00)
161 {
162 /* 1 byte */
163 /* Codes_SRS_UTF8_CHECKER_01_006: [ 00000000 0xxxxxxx 0xxxxxxx ]*/
164 /* Codes_SRS_UTF8_CHECKER_01_005: [ On success it shall return true. ]*/
165 result = true;
166 pos++;
167 }
168 else
169 {
170 /* error */
171 result = false;
172 }
173 }
174 }
175
176 return result;
177}
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