Xin Zhang / azure-iot-c-sdk-f767zi

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Dependents:   samplemqtt

c-utility/src/utf8_checker.c@0:f7f1f0d76dd6, 2018-08-23 (annotated)

Committer:
XinZhangMS
Date:
Thu Aug 23 06:52:14 2018 +0000
Revision:
0:f7f1f0d76dd6
azure-c-sdk for mbed os supporting NUCLEO_F767ZI

Who changed what in which revision?

UserRevisionLine numberNew contents of line
XinZhangMS 0:f7f1f0d76dd6 1 // Copyright (c) Microsoft. All rights reserved.
XinZhangMS 0:f7f1f0d76dd6 2 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
XinZhangMS 0:f7f1f0d76dd6 3
XinZhangMS 0:f7f1f0d76dd6 4 #ifdef __cplusplus
XinZhangMS 0:f7f1f0d76dd6 5 #include <cstdlib>
XinZhangMS 0:f7f1f0d76dd6 6 #include <cstddef>
XinZhangMS 0:f7f1f0d76dd6 7 #include <cstdint>
XinZhangMS 0:f7f1f0d76dd6 8 #else
XinZhangMS 0:f7f1f0d76dd6 9 #include <stdlib.h>
XinZhangMS 0:f7f1f0d76dd6 10 #include <stdbool.h>
XinZhangMS 0:f7f1f0d76dd6 11 #include <stddef.h>
XinZhangMS 0:f7f1f0d76dd6 12 #include <stdint.h>
XinZhangMS 0:f7f1f0d76dd6 13 #endif
XinZhangMS 0:f7f1f0d76dd6 14
XinZhangMS 0:f7f1f0d76dd6 15 #include "azure_c_shared_utility/utf8_checker.h"
XinZhangMS 0:f7f1f0d76dd6 16
XinZhangMS 0:f7f1f0d76dd6 17 bool utf8_checker_is_valid_utf8(const unsigned char* utf8_str, size_t length)
XinZhangMS 0:f7f1f0d76dd6 18 {
XinZhangMS 0:f7f1f0d76dd6 19 bool result;
XinZhangMS 0:f7f1f0d76dd6 20
XinZhangMS 0:f7f1f0d76dd6 21 if (utf8_str == NULL)
XinZhangMS 0:f7f1f0d76dd6 22 {
XinZhangMS 0:f7f1f0d76dd6 23 /* Codes_SRS_UTF8_CHECKER_01_002: [ If `utf8_checker_is_valid_utf8` is called with NULL `utf8_str` it shall return false. ]*/
XinZhangMS 0:f7f1f0d76dd6 24 result = false;
XinZhangMS 0:f7f1f0d76dd6 25 }
XinZhangMS 0:f7f1f0d76dd6 26 else
XinZhangMS 0:f7f1f0d76dd6 27 {
XinZhangMS 0:f7f1f0d76dd6 28 size_t pos = 0;
XinZhangMS 0:f7f1f0d76dd6 29
XinZhangMS 0:f7f1f0d76dd6 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. ]*/
XinZhangMS 0:f7f1f0d76dd6 31 result = true;
XinZhangMS 0:f7f1f0d76dd6 32
XinZhangMS 0:f7f1f0d76dd6 33 while ((result == true) &&
XinZhangMS 0:f7f1f0d76dd6 34 (pos < length))
XinZhangMS 0:f7f1f0d76dd6 35 {
XinZhangMS 0:f7f1f0d76dd6 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. ]*/
XinZhangMS 0:f7f1f0d76dd6 37 if ((utf8_str[pos] >> 3) == 0x1E)
XinZhangMS 0:f7f1f0d76dd6 38 {
XinZhangMS 0:f7f1f0d76dd6 39 /* 4 bytes */
XinZhangMS 0:f7f1f0d76dd6 40 /* Codes_SRS_UTF8_CHECKER_01_009: [ 000uuuuu zzzzyyyy yyxxxxxx 11110uuu 10uuzzzz 10yyyyyy 10xxxxxx ]*/
XinZhangMS 0:f7f1f0d76dd6 41 uint32_t code_point = (utf8_str[pos] & 0x07);
XinZhangMS 0:f7f1f0d76dd6 42
XinZhangMS 0:f7f1f0d76dd6 43 pos++;
XinZhangMS 0:f7f1f0d76dd6 44 if ((pos < length) &&
XinZhangMS 0:f7f1f0d76dd6 45 ((utf8_str[pos] >> 6) == 0x02))
XinZhangMS 0:f7f1f0d76dd6 46 {
XinZhangMS 0:f7f1f0d76dd6 47 code_point <<= 6;
XinZhangMS 0:f7f1f0d76dd6 48 code_point += utf8_str[pos] & 0x3F;
XinZhangMS 0:f7f1f0d76dd6 49
XinZhangMS 0:f7f1f0d76dd6 50 pos++;
XinZhangMS 0:f7f1f0d76dd6 51 if ((pos < length) &&
XinZhangMS 0:f7f1f0d76dd6 52 ((utf8_str[pos] >> 6) == 0x02))
XinZhangMS 0:f7f1f0d76dd6 53 {
XinZhangMS 0:f7f1f0d76dd6 54 code_point <<= 6;
XinZhangMS 0:f7f1f0d76dd6 55 code_point += utf8_str[pos] & 0x3F;
XinZhangMS 0:f7f1f0d76dd6 56
XinZhangMS 0:f7f1f0d76dd6 57 pos++;
XinZhangMS 0:f7f1f0d76dd6 58 if ((pos < length) &&
XinZhangMS 0:f7f1f0d76dd6 59 ((utf8_str[pos] >> 6) == 0x02))
XinZhangMS 0:f7f1f0d76dd6 60 {
XinZhangMS 0:f7f1f0d76dd6 61 code_point <<= 6;
XinZhangMS 0:f7f1f0d76dd6 62 code_point += utf8_str[pos] & 0x3F;
XinZhangMS 0:f7f1f0d76dd6 63
XinZhangMS 0:f7f1f0d76dd6 64 if (code_point <= 0xFFFF)
XinZhangMS 0:f7f1f0d76dd6 65 {
XinZhangMS 0:f7f1f0d76dd6 66 result = false;
XinZhangMS 0:f7f1f0d76dd6 67 }
XinZhangMS 0:f7f1f0d76dd6 68 else
XinZhangMS 0:f7f1f0d76dd6 69 {
XinZhangMS 0:f7f1f0d76dd6 70 /* Codes_SRS_UTF8_CHECKER_01_005: [ On success it shall return true. ]*/
XinZhangMS 0:f7f1f0d76dd6 71 result = true;
XinZhangMS 0:f7f1f0d76dd6 72 pos++;
XinZhangMS 0:f7f1f0d76dd6 73 }
XinZhangMS 0:f7f1f0d76dd6 74 }
XinZhangMS 0:f7f1f0d76dd6 75 else
XinZhangMS 0:f7f1f0d76dd6 76 {
XinZhangMS 0:f7f1f0d76dd6 77 result = false;
XinZhangMS 0:f7f1f0d76dd6 78 }
XinZhangMS 0:f7f1f0d76dd6 79 }
XinZhangMS 0:f7f1f0d76dd6 80 else
XinZhangMS 0:f7f1f0d76dd6 81 {
XinZhangMS 0:f7f1f0d76dd6 82 result = false;
XinZhangMS 0:f7f1f0d76dd6 83 }
XinZhangMS 0:f7f1f0d76dd6 84 }
XinZhangMS 0:f7f1f0d76dd6 85 else
XinZhangMS 0:f7f1f0d76dd6 86 {
XinZhangMS 0:f7f1f0d76dd6 87 result = false;
XinZhangMS 0:f7f1f0d76dd6 88 }
XinZhangMS 0:f7f1f0d76dd6 89 }
XinZhangMS 0:f7f1f0d76dd6 90 else if ((utf8_str[pos] >> 4) == 0x0E)
XinZhangMS 0:f7f1f0d76dd6 91 {
XinZhangMS 0:f7f1f0d76dd6 92 /* 3 bytes */
XinZhangMS 0:f7f1f0d76dd6 93 /* Codes_SRS_UTF8_CHECKER_01_008: [ zzzzyyyy yyxxxxxx 1110zzzz 10yyyyyy 10xxxxxx ]*/
XinZhangMS 0:f7f1f0d76dd6 94 uint32_t code_point = (utf8_str[pos] & 0x0F);
XinZhangMS 0:f7f1f0d76dd6 95
XinZhangMS 0:f7f1f0d76dd6 96 pos++;
XinZhangMS 0:f7f1f0d76dd6 97 if ((pos < length) &&
XinZhangMS 0:f7f1f0d76dd6 98 ((utf8_str[pos] >> 6) == 0x02))
XinZhangMS 0:f7f1f0d76dd6 99 {
XinZhangMS 0:f7f1f0d76dd6 100 code_point <<= 6;
XinZhangMS 0:f7f1f0d76dd6 101 code_point += utf8_str[pos] & 0x3F;
XinZhangMS 0:f7f1f0d76dd6 102
XinZhangMS 0:f7f1f0d76dd6 103 pos++;
XinZhangMS 0:f7f1f0d76dd6 104 if ((pos < length) &&
XinZhangMS 0:f7f1f0d76dd6 105 ((utf8_str[pos] >> 6) == 0x02))
XinZhangMS 0:f7f1f0d76dd6 106 {
XinZhangMS 0:f7f1f0d76dd6 107 code_point <<= 6;
XinZhangMS 0:f7f1f0d76dd6 108 code_point += utf8_str[pos] & 0x3F;
XinZhangMS 0:f7f1f0d76dd6 109
XinZhangMS 0:f7f1f0d76dd6 110 if (code_point <= 0x7FF)
XinZhangMS 0:f7f1f0d76dd6 111 {
XinZhangMS 0:f7f1f0d76dd6 112 result = false;
XinZhangMS 0:f7f1f0d76dd6 113 }
XinZhangMS 0:f7f1f0d76dd6 114 else
XinZhangMS 0:f7f1f0d76dd6 115 {
XinZhangMS 0:f7f1f0d76dd6 116 /* Codes_SRS_UTF8_CHECKER_01_005: [ On success it shall return true. ]*/
XinZhangMS 0:f7f1f0d76dd6 117 result = true;
XinZhangMS 0:f7f1f0d76dd6 118 pos++;
XinZhangMS 0:f7f1f0d76dd6 119 }
XinZhangMS 0:f7f1f0d76dd6 120 }
XinZhangMS 0:f7f1f0d76dd6 121 else
XinZhangMS 0:f7f1f0d76dd6 122 {
XinZhangMS 0:f7f1f0d76dd6 123 result = false;
XinZhangMS 0:f7f1f0d76dd6 124 }
XinZhangMS 0:f7f1f0d76dd6 125 }
XinZhangMS 0:f7f1f0d76dd6 126 else
XinZhangMS 0:f7f1f0d76dd6 127 {
XinZhangMS 0:f7f1f0d76dd6 128 result = false;
XinZhangMS 0:f7f1f0d76dd6 129 }
XinZhangMS 0:f7f1f0d76dd6 130 }
XinZhangMS 0:f7f1f0d76dd6 131 else if ((utf8_str[pos] >> 5) == 0x06)
XinZhangMS 0:f7f1f0d76dd6 132 {
XinZhangMS 0:f7f1f0d76dd6 133 /* 2 bytes */
XinZhangMS 0:f7f1f0d76dd6 134 /* Codes_SRS_UTF8_CHECKER_01_007: [ 00000yyy yyxxxxxx 110yyyyy 10xxxxxx ]*/
XinZhangMS 0:f7f1f0d76dd6 135 uint32_t code_point = (utf8_str[pos] & 0x1F);
XinZhangMS 0:f7f1f0d76dd6 136
XinZhangMS 0:f7f1f0d76dd6 137 pos++;
XinZhangMS 0:f7f1f0d76dd6 138 if ((pos < length) &&
XinZhangMS 0:f7f1f0d76dd6 139 ((utf8_str[pos] >> 6) == 0x02))
XinZhangMS 0:f7f1f0d76dd6 140 {
XinZhangMS 0:f7f1f0d76dd6 141 code_point <<= 6;
XinZhangMS 0:f7f1f0d76dd6 142 code_point += utf8_str[pos] & 0x3F;
XinZhangMS 0:f7f1f0d76dd6 143
XinZhangMS 0:f7f1f0d76dd6 144 if (code_point <= 0x7F)
XinZhangMS 0:f7f1f0d76dd6 145 {
XinZhangMS 0:f7f1f0d76dd6 146 result = false;
XinZhangMS 0:f7f1f0d76dd6 147 }
XinZhangMS 0:f7f1f0d76dd6 148 else
XinZhangMS 0:f7f1f0d76dd6 149 {
XinZhangMS 0:f7f1f0d76dd6 150 /* Codes_SRS_UTF8_CHECKER_01_005: [ On success it shall return true. ]*/
XinZhangMS 0:f7f1f0d76dd6 151 result = true;
XinZhangMS 0:f7f1f0d76dd6 152 pos++;
XinZhangMS 0:f7f1f0d76dd6 153 }
XinZhangMS 0:f7f1f0d76dd6 154 }
XinZhangMS 0:f7f1f0d76dd6 155 else
XinZhangMS 0:f7f1f0d76dd6 156 {
XinZhangMS 0:f7f1f0d76dd6 157 result = false;
XinZhangMS 0:f7f1f0d76dd6 158 }
XinZhangMS 0:f7f1f0d76dd6 159 }
XinZhangMS 0:f7f1f0d76dd6 160 else if ((utf8_str[pos] >> 7) == 0x00)
XinZhangMS 0:f7f1f0d76dd6 161 {
XinZhangMS 0:f7f1f0d76dd6 162 /* 1 byte */
XinZhangMS 0:f7f1f0d76dd6 163 /* Codes_SRS_UTF8_CHECKER_01_006: [ 00000000 0xxxxxxx 0xxxxxxx ]*/
XinZhangMS 0:f7f1f0d76dd6 164 /* Codes_SRS_UTF8_CHECKER_01_005: [ On success it shall return true. ]*/
XinZhangMS 0:f7f1f0d76dd6 165 result = true;
XinZhangMS 0:f7f1f0d76dd6 166 pos++;
XinZhangMS 0:f7f1f0d76dd6 167 }
XinZhangMS 0:f7f1f0d76dd6 168 else
XinZhangMS 0:f7f1f0d76dd6 169 {
XinZhangMS 0:f7f1f0d76dd6 170 /* error */
XinZhangMS 0:f7f1f0d76dd6 171 result = false;
XinZhangMS 0:f7f1f0d76dd6 172 }
XinZhangMS 0:f7f1f0d76dd6 173 }
XinZhangMS 0:f7f1f0d76dd6 174 }
XinZhangMS 0:f7f1f0d76dd6 175
XinZhangMS 0:f7f1f0d76dd6 176 return result;
XinZhangMS 0:f7f1f0d76dd6 177 }