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gs1_verify: GMN (8013) update (gs1-format-spec.txt), X..25, csumalpha

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gitlost 2021-02-08 02:45:11 +00:00
parent 5d4fe0b572
commit a91933cbdd
5 changed files with 573 additions and 458 deletions
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64
backend/gs1.c
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@ -160,6 +160,61 @@ static int csum(const unsigned char *data, int data_len, int offset, int min, in
return 1;
}
/* Check alphanumeric check characters (GS1 General Spec 7.9.5) */
static int csumalpha(const unsigned char *data, int data_len, int offset, int min, int max, int *p_err_no,
int *p_err_posn, char err_msg[50], const int length_only) {
(void)max;
data_len -= offset;
if (data_len < min) {
return 0;
}
if (data_len && data_len < 2) { /* Do this check separately for backward compatibility */
*p_err_no = 4;
return 0;
}
if (!length_only && data_len) {
static const char c82[] = {
0, 1, -1, -1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, /*!-0*/
14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, -1, /*1-@*/
29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, /*A-P*/
45, 46, 47, 48, 49, 50, 51, 52, 53, 54, -1, -1, -1, -1, 55, -1, /*Q-`*/
56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, /*a-p*/
72, 73, 74, 75, 76, 77, 78, 79, 80, 81, /*q-z*/
};
static const char c32[] = "23456789ABCDEFGHJKLMNPQRSTUVWXYZ";
static const char weights[] = {
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83
};
const unsigned char *d = data + offset;
const unsigned char *de = d + (data_len > max ? max : data_len) - 2; /* Note less last 2 characters */
int checksum = 0, c1, c2;
for (; d < de; d++) {
checksum += c82[*d - '!'] * weights[de - 1 - d];
}
checksum %= 1021;
c1 = c32[checksum >> 5];
c2 = c32[checksum & 0x1F];
if (de[0] != c1 || de[1] != c2) {
*p_err_no = 3;
if (de[0] != c1) {
*p_err_posn = (de - data) + 1;
sprintf(err_msg, "Bad checksum '%c', expected '%c'", de[0], c1);
} else {
*p_err_posn = (de + 1 - data) + 1;
sprintf(err_msg, "Bad checksum '%c', expected '%c'", de[1], c2);
}
return 0;
}
}
return 1;
}
/* Check for a GS1 Prefix (GS1 General Spec GS1 1.4.2) */
static int key(const unsigned char *data, int data_len, int offset, int min, int max, int *p_err_no,
int *p_err_posn, char err_msg[50], const int length_only) {
@ -943,7 +998,8 @@ static int couponcode(const unsigned char *data, int data_len, int offset, int m
if (d == NULL) {
return 0;
}
d = coupon_vli(data, data_len, d, "2nd Purch. GS1 Co. Prefix", 6, 0, 6, 1, p_err_no, p_err_posn, err_msg);
d = coupon_vli(data, data_len, d, "2nd Purch. GS1 Co. Prefix", 6, 0, 6, 1, p_err_no, p_err_posn,
err_msg);
if (d == NULL) {
return 0;
}
@ -968,7 +1024,8 @@ static int couponcode(const unsigned char *data, int data_len, int offset, int m
if (d == NULL) {
return 0;
}
d = coupon_vli(data, data_len, d, "3rd Purch. GS1 Co. Prefix", 6, 0, 6, 1, p_err_no, p_err_posn, err_msg);
d = coupon_vli(data, data_len, d, "3rd Purch. GS1 Co. Prefix", 6, 0, 6, 1, p_err_no, p_err_posn,
err_msg);
if (d == NULL) {
return 0;
}
@ -1048,7 +1105,8 @@ static int couponcode(const unsigned char *data, int data_len, int offset, int m
*p_err_no = 3;
*p_err_posn = d - 1 - data + 1;
sprintf(err_msg, data_field < 0 ? "Non-numeric Data Field '%c'" : "Invalid Data Field '%c'", *(d - 1));
sprintf(err_msg, data_field < 0 ? "Non-numeric Data Field '%c'" : "Invalid Data Field '%c'",
*(d - 1));
return 0;
}
}