Used to ensure that the AI component has a valid alphanumeric check character pair.
70{
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79
80 static const unsigned int primes[] = {
81 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37,
82 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89,
83 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151,
84 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223,
85 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281,
86 283, 293, 307, 311, 313, 317, 331, 337, 347, 349, 353, 359,
87 367, 373, 379, 383, 389, 397, 401, 409, 419, 421, 431, 433,
88 439, 443, 449, 457, 461, 463, 467, 479, 487, 491, 499, 503,
89 509
90 };
91
92
93
94
95
96 static const char* const cset82 =
97 "!\"%&'()*+,-./0123456789:;<=>?ABCDEFGHIJKLMNOPQRSTUVWXYZ_"
98 "abcdefghijklmnopqrstuvwxyz";
99
100
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102
103
104 static const char* const cset32 = "23456789ABCDEFGHJKLMNPQRSTUVWXYZ";
105
106 size_t pos, len;
107 unsigned int sum = 0;
108
109 assert(data);
110
111 len = strlen(data);
112
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117 if (len < 2)
120 0,
121 len
122 );
123
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127
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129 if (len - 2 > sizeof(primes) / sizeof(primes[0]))
132 0,
133 len
134 );
135
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139
140 if ((pos = strspn(data, cset82)) < len - 2)
143 pos,
144 1
145 );
146
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149
150
151 if ((pos = strspn(&data[len - 2], cset32)) != 2)
154 len - 2 + pos,
155 1
156 );
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172
173 if (len > 2) {
174 size_t i;
175 const unsigned int *p;
176
177 for (i = 0, p = primes + (len - 3); i < len - 2; i++, p--)
178 sum += (unsigned int)(strchr(cset82, data[i]) - cset82) * *p;
179 sum %= 1021;
180 }
181
182 if (data[len-2] != cset32[sum >> 5] || data[len-1] != cset32[sum & 31])
185 len - 2,
186 2
187 );
188
190
191}
#define GS1_LINTER_RETURN_ERROR(error, position, length)
Return from a linter indicating that a problem was detected with the given data.
Definition gs1syntaxdictionary-utils.h:77
#define GS1_LINTER_RETURN_OK
Return from a linter indicating that no problem was detected with the given data.
Definition gs1syntaxdictionary-utils.h:62
@ GS1_LINTER_TOO_LONG_FOR_CHECK_PAIR_IMPLEMENTATION
The component is too long to perform an alphanumeric check character pair calculation.
Definition gs1syntaxdictionary.h:86
@ GS1_LINTER_INCORRECT_CHECK_PAIR
The alphanumeric check-character pair are incorrect.
Definition gs1syntaxdictionary.h:84
@ GS1_LINTER_INVALID_CSET82_CHARACTER
A non-CSET 82 character was found where a CSET 82 character is expected.
Definition gs1syntaxdictionary.h:79
@ GS1_LINTER_TOO_SHORT_FOR_CHECK_PAIR
The component is too short to perform an alphanumeric check character pair calculation.
Definition gs1syntaxdictionary.h:85
@ GS1_LINTER_INVALID_CSET32_CHARACTER
A non-CSET 32 character was found where a CSET 32 character is expected.
Definition gs1syntaxdictionary.h:81