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zint/backend/gs1.c

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/* gs1.c - Verifies GS1 data */
/*
libzint - the open source barcode library
Copyright (C) 2009 - 2020 Robin Stuart <rstuart114@gmail.com>
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the name of the project nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
*/
/* vim: set ts=4 sw=4 et : */
#include <stdio.h>
#ifdef _MSC_VER
#include <malloc.h>
#endif
#include "common.h"
#include "gs1.h"
/* This code does some checks on the integrity of GS1 data. It is not intended
to be bulletproof, nor does it report very accurately what problem was found
or where, but should prevent some of the more common encoding errors */
static void itostr(char ai_string[], int ai_value) {
int thou, hund, ten, unit;
char temp[2];
strcpy(ai_string, "(");
thou = ai_value / 1000;
hund = (ai_value - (1000 * thou)) / 100;
ten = (ai_value - ((1000 * thou) + (100 * hund))) / 10;
unit = ai_value - ((1000 * thou) + (100 * hund) + (10 * ten));
temp[1] = '\0';
if (ai_value >= 1000) {
temp[0] = itoc(thou);
strcat(ai_string, temp);
}
if (ai_value >= 100) {
temp[0] = itoc(hund);
strcat(ai_string, temp);
}
temp[0] = itoc(ten);
strcat(ai_string, temp);
temp[0] = itoc(unit);
strcat(ai_string, temp);
strcat(ai_string, ")");
}
/* Returns the number of times a character occurs in a string */
static int ustrchr_cnt(const unsigned char string[], const size_t length, const unsigned char c) {
int count = 0;
unsigned int i;
for (i = 0; i < length; i++) {
if (string[i] == c) {
count++;
}
}
return count;
}
INTERNAL int gs1_verify(struct zint_symbol *symbol, const unsigned char source[], const size_t src_len, char reduced[]) {
int i, j, last_ai, ai_latch;
char ai_string[7]; /* 6 char max "(NNNN)" */
int bracket_level, max_bracket_level, ai_length, max_ai_length, min_ai_length;
int ai_count;
int error_latch;
#ifdef _MSC_VER
int *ai_value;
int *ai_location;
int *data_location;
int *data_length;
#endif
int ai_max = ustrchr_cnt(source, src_len, '[') + 1; /* Plus 1 so non-zero */
#ifndef _MSC_VER
int ai_value[ai_max], ai_location[ai_max], data_location[ai_max], data_length[ai_max];
#else
ai_value = (int*) _alloca(ai_max * sizeof(int));
ai_location = (int*) _alloca(ai_max * sizeof(int));
data_location = (int*) _alloca(ai_max * sizeof(int));
data_length = (int*) _alloca(ai_max * sizeof(int));
#endif
/* Detect extended ASCII characters */
for (i = 0; i < (int) src_len; i++) {
if (source[i] >= 128) {
strcpy(symbol->errtxt, "250: Extended ASCII characters are not supported by GS1");
return ZINT_ERROR_INVALID_DATA;
}
if (source[i] == '\0') {
strcpy(symbol->errtxt, "262: NUL characters not permitted in GS1 mode");
return ZINT_ERROR_INVALID_DATA;
}
if (source[i] < 32) {
strcpy(symbol->errtxt, "251: Control characters are not supported by GS1");
return ZINT_ERROR_INVALID_DATA;
}
if (source[i] == 127) {
strcpy(symbol->errtxt, "263: DEL characters are not supported by GS1");
return ZINT_ERROR_INVALID_DATA;
}
}
if (source[0] != '[') {
strcpy(symbol->errtxt, "252: Data does not start with an AI");
return ZINT_ERROR_INVALID_DATA;
}
/* Check the position of the brackets */
bracket_level = 0;
max_bracket_level = 0;
ai_length = 0;
max_ai_length = 0;
min_ai_length = 5;
j = 0;
ai_latch = 0;
for (i = 0; i < (int) src_len; i++) {
ai_length += j;
if (((j == 1) && (source[i] != ']')) && ((source[i] < '0') || (source[i] > '9'))) {
ai_latch = 1;
}
if (source[i] == '[') {
bracket_level++;
j = 1;
}
if (source[i] == ']') {
bracket_level--;
if (ai_length < min_ai_length) {
min_ai_length = ai_length;
}
j = 0;
ai_length = 0;
}
if (bracket_level > max_bracket_level) {
max_bracket_level = bracket_level;
}
if (ai_length > max_ai_length) {
max_ai_length = ai_length;
}
}
min_ai_length--;
if (bracket_level != 0) {
/* Not all brackets are closed */
strcpy(symbol->errtxt, "253: Malformed AI in input data (brackets don\'t match)");
return ZINT_ERROR_INVALID_DATA;
}
if (max_bracket_level > 1) {
/* Nested brackets */
strcpy(symbol->errtxt, "254: Found nested brackets in input data");
return ZINT_ERROR_INVALID_DATA;
}
if (max_ai_length > 4) {
/* AI is too long */
strcpy(symbol->errtxt, "255: Invalid AI in input data (AI too long)");
return ZINT_ERROR_INVALID_DATA;
}
if (min_ai_length <= 1) {
/* AI is too short */
strcpy(symbol->errtxt, "256: Invalid AI in input data (AI too short)");
return ZINT_ERROR_INVALID_DATA;
}
if (ai_latch == 1) {
/* Non-numeric data in AI */
strcpy(symbol->errtxt, "257: Invalid AI in input data (non-numeric characters in AI)");
return ZINT_ERROR_INVALID_DATA;
}
ai_count = 0;
for (i = 1; i < (int) src_len; i++) {
if (source[i - 1] == '[') {
ai_location[ai_count] = i;
j = 0;
do {
ai_string[j] = source[i + j];
j++;
} while (ai_string[j - 1] != ']');
ai_string[j - 1] = '\0';
ai_value[ai_count] = atoi(ai_string);
ai_count++;
}
}
for (i = 0; i < ai_count; i++) {
data_location[i] = ai_location[i] + 3;
if (ai_value[i] >= 100) {
data_location[i]++;
}
if (ai_value[i] >= 1000) {
data_location[i]++;
}
data_length[i] = 0;
do {
data_length[i]++;
} while ((source[data_location[i] + data_length[i] - 1] != '[') && (data_location[i] + data_length[i] <= (int) src_len));
data_length[i]--;
}
for (i = 0; i < ai_count; i++) {
if (data_length[i] == 0) {
/* No data for given AI */
strcpy(symbol->errtxt, "258: Empty data field in input data");
return ZINT_ERROR_INVALID_DATA;
}
}
strcpy(ai_string, "");
// Check for valid AI values and data lengths according to GS1 General
// Specification Release 19, January 2019
for (i = 0; i < ai_count; i++) {
error_latch = 2;
switch (ai_value[i]) {
// Length 2 Fixed
case 20: // VARIANT
if (data_length[i] != 2) {
error_latch = 1;
} else {
error_latch = 0;
}
break;
// Length 3 Fixed
case 422: // ORIGIN
case 424: // COUNTRY PROCESS
case 426: // COUNTRY FULL PROCESS
if (data_length[i] != 3) {
error_latch = 1;
} else {
error_latch = 0;
}
break;
// Length 4 Fixed
case 7040: // UIC+EXT
case 8111: // POINTS
if (data_length[i] != 4) {
error_latch = 1;
} else {
error_latch = 0;
}
break;
// Length 6 Fixed
case 11: // PROD DATE
case 12: // DUE DATE
case 13: // PACK DATE
case 15: // BEST BY
case 16: // SELL BY
case 17: // USE BY
case 7006: // FIRST FREEZE DATE
case 8005: // PRICE PER UNIT
if (data_length[i] != 6) {
error_latch = 1;
} else {
error_latch = 0;
}
break;
// Length 10 Fixed
case 7003: // EXPIRY TIME
if (data_length[i] != 10) {
error_latch = 1;
} else {
error_latch = 0;
}
break;
// Length 13 Fixed
case 410: // SHIP TO LOC
case 411: // BILL TO
case 412: // PURCHASE FROM
case 413: // SHIP FOR LOC
case 414: // LOC NO
case 415: // PAY TO
case 416: // PROD/SERV LOC
case 417: // PARTY GLN
case 7001: // NSN
if (data_length[i] != 13) {
error_latch = 1;
} else {
error_latch = 0;
}
break;
// Length 14 Fixed
case 1: // GTIN
case 2: // CONTENT
case 8001: // DIMENSIONS
if (data_length[i] != 14) {
error_latch = 1;
} else {
error_latch = 0;
}
break;
// Length 17 Fixed
case 402: // GSIN
if (data_length[i] != 17) {
error_latch = 1;
} else {
error_latch = 0;
}
break;
// Length 18 Fixed
case 0: // SSCC
case 8006: // ITIP
case 8017: // GSRN PROVIDER
case 8018: // GSRN RECIPIENT
case 8026: // ITIP CONTENT
if (data_length[i] != 18) {
error_latch = 1;
} else {
error_latch = 0;
}
break;
// Length 2 Max
case 7010: // PROD METHOD
if (data_length[i] > 2) {
error_latch = 1;
} else {
error_latch = 0;
}
break;
// Length 3 Max
case 427: // ORIGIN SUBDIVISION
case 7008: // AQUATIC SPECIES
if (data_length[i] > 3) {
error_latch = 1;
} else {
error_latch = 0;
}
break;
// Length 4 Max
case 7004: // ACTIVE POTENCY
if (data_length[i] > 4) {
error_latch = 1;
} else {
error_latch = 0;
}
break;
// Length 6 Max
case 242: // MTO VARIANT
if (data_length[i] > 6) {
error_latch = 1;
} else {
error_latch = 0;
}
break;
// Length 8 Max
case 30: // VAR COUNT
case 37: // COUNT
if (data_length[i] > 8) {
error_latch = 1;
} else {
error_latch = 0;
}
break;
// Length 10 Max
case 7009: // FISHING GEAR TYPE
case 8019: // SRIN
if (data_length[i] > 10) {
error_latch = 1;
} else {
error_latch = 0;
}
break;
// Length 12 Max
case 7005: // CATCH AREA
case 8011: // CPID SERIAL
if (data_length[i] > 12) {
error_latch = 1;
} else {
error_latch = 0;
}
break;
// Length 20 Max
case 10: // BATCH/LOT
case 21: // SERIAL
case 22: // CPV
case 243: // PCN
case 254: // GLN EXTENSION COMPONENT
case 420: // SHIP TO POST
case 7020: // REFURB LOT
case 7021: // FUNC STAT
case 7022: // REV STAT
case 710: // NHRN PZN
case 711: // NHRN CIP
case 712: // NHRN CN
case 713: // NHRN DRN
case 714: // NHRN AIM
case 7240: // PROTOCOL
case 8002: // CMT NO
case 8012: // VERSION
if (data_length[i] > 20) {
error_latch = 1;
} else {
error_latch = 0;
}
break;
// Length 25 Max
case 8020: // REF NO
if (data_length[i] > 25) {
error_latch = 1;
} else {
error_latch = 0;
}
break;
// Length 28 Max
case 235: // TPX
if (data_length[i] > 28) {
error_latch = 1;
} else {
error_latch = 0;
}
break;
// Length 30 Max
case 240: // ADDITIONAL ID
case 241: // CUST PART NO
case 250: // SECONDARY SERIAL
case 251: // REF TO SOURCE
case 400: // ORDER NUMBER
case 401: // GINC
case 403: // ROUTE
case 7002: // MEAT CUT
case 7023: // GIAI ASSEMBLY
case 8004: // GIAI
case 8010: // CPID
case 8013: // BUDI-DI
case 90: // INTERNAL
if (data_length[i] > 30) {
error_latch = 1;
} else {
error_latch = 0;
}
break;
// Length 34 Max
case 8007: // IBAN
if (data_length[i] > 34) {
error_latch = 1;
} else {
error_latch = 0;
}
break;
// Length 50 Max
case 8009: // OPTSEN
if (data_length[i] > 50) {
error_latch = 1;
} else {
error_latch = 0;
}
break;
// Length 70 Max
case 8110: // Coupon code
case 8112: // Paperless coupon code
case 8200: // PRODUCT URL
if (data_length[i] > 70) {
error_latch = 1;
} else {
error_latch = 0;
}
break;
}
if (ai_value[i] == 253) { // GDTI
if ((data_length[i] < 13) || (data_length[i] > 30)) {
error_latch = 1;
} else {
error_latch = 0;
}
}
if (ai_value[i] == 255) { // GCN
if ((data_length[i] < 13) || (data_length[i] > 25)) {
error_latch = 1;
} else {
error_latch = 0;
}
}
if ((ai_value[i] >= 3100) && (ai_value[i] <= 3169)) {
if (data_length[i] != 6) {
error_latch = 1;
} else {
error_latch = 0;
}
}
if ((ai_value[i] >= 3200) && (ai_value[i] <= 3379)) {
if (data_length[i] != 6) {
error_latch = 1;
} else {
error_latch = 0;
}
}
if ((ai_value[i] >= 3400) && (ai_value[i] <= 3579)) {
if (data_length[i] != 6) {
error_latch = 1;
} else {
error_latch = 0;
}
}
if ((ai_value[i] >= 3600) && (ai_value[i] <= 3699)) {
if (data_length[i] != 6) {
error_latch = 1;
} else {
error_latch = 0;
}
}
if ((ai_value[i] >= 3900) && (ai_value[i] <= 3909)) { // AMOUNT
if (data_length[i] > 15) {
error_latch = 1;
} else {
error_latch = 0;
}
}
if ((ai_value[i] >= 3910) && (ai_value[i] <= 3919)) { // AMOUNT
if ((data_length[i] < 4) || (data_length[i] > 18)) {
error_latch = 1;
} else {
error_latch = 0;
}
}
if ((ai_value[i] >= 3920) && (ai_value[i] <= 3929)) { // PRICE
if (data_length[i] > 15) {
error_latch = 1;
} else {
error_latch = 0;
}
}
if ((ai_value[i] >= 3930) && (ai_value[i] <= 3939)) { // PRICE
if ((data_length[i] < 4) || (data_length[i] > 18)) {
error_latch = 1;
} else {
error_latch = 0;
}
}
if ((ai_value[i] >= 3940) && (ai_value[i] <= 3949)) { // PRCNT OFF
if (data_length[i] != 4) {
error_latch = 1;
} else {
error_latch = 0;
}
}
if (ai_value[i] == 421) { // SHIP TO POST
if ((data_length[i] < 4) || (data_length[i] > 12)) {
error_latch = 1;
} else {
error_latch = 0;
}
}
if ((ai_value[i] == 423) || (ai_value[i] == 425)) {
// COUNTRY INITIAL PROCESS || COUNTRY DISASSEMBLY
if ((data_length[i] < 4) || (data_length[i] > 15)) {
error_latch = 1;
} else {
error_latch = 0;
}
}
if (ai_value[i] == 7007) { // HARVEST DATE
if ((data_length[i] != 6) && (data_length[i] != 12)) {
error_latch = 1;
} else {
error_latch = 0;
}
}
if ((ai_value[i] >= 7030) && (ai_value[i] <= 7039)) { // PROCESSOR #
if ((data_length[i] < 4) || (data_length[i] > 30)) {
error_latch = 1;
} else {
error_latch = 0;
}
}
if ((ai_value[i] >= 7230) && (ai_value[i] <= 7239)) { // CERT #
if ((data_length[i] < 3) || (data_length[i] > 30)) {
error_latch = 1;
} else {
error_latch = 0;
}
}
if (ai_value[i] == 8003) { // GRAI
if ((data_length[i] < 15) || (data_length[i] > 30)) {
error_latch = 1;
} else {
error_latch = 0;
}
}
if (ai_value[i] == 8008) { // PROD TIME
if ((data_length[i] != 8) && (data_length[i] != 10) && (data_length[i] != 12)) {
error_latch = 1;
} else {
error_latch = 0;
}
}
if ((ai_value[i] >= 91) && (ai_value[i] <= 99)) { // INTERNAL
if (data_length[i] > 90) {
error_latch = 1;
} else {
error_latch = 0;
}
}
if (error_latch == 1) {
itostr(ai_string, ai_value[i]);
strcpy(symbol->errtxt, "259: Invalid data length for AI ");
strcat(symbol->errtxt, ai_string);
return ZINT_ERROR_INVALID_DATA;
}
if (error_latch == 2) {
itostr(ai_string, ai_value[i]);
strcpy(symbol->errtxt, "260: Invalid AI value ");
strcat(symbol->errtxt, ai_string);
return ZINT_ERROR_INVALID_DATA;
}
}
/* Resolve AI data - put resulting string in 'reduced' */
j = 0;
last_ai = 0;
ai_latch = 1;
for (i = 0; i < (int) src_len; i++) {
if ((source[i] != '[') && (source[i] != ']')) {
reduced[j++] = source[i];
}
if (source[i] == '[') {
/* Start of an AI string */
if (ai_latch == 0) {
reduced[j++] = '[';
}
ai_string[0] = source[i + 1];
ai_string[1] = source[i + 2];
ai_string[2] = '\0';
last_ai = atoi(ai_string);
ai_latch = 0;
/* The following values from "GS-1 General Specification version 8.0 issue 2, May 2008"
figure 5.4.8.2.1 - 1 "Element Strings with Pre-Defined Length Using Application Identifiers" */
if (
((last_ai >= 0) && (last_ai <= 4))
|| ((last_ai >= 11) && (last_ai <= 20))
|| (last_ai == 23) /* legacy support - see 5.3.8.2.2 */
|| ((last_ai >= 31) && (last_ai <= 36))
|| (last_ai == 41)
) {
ai_latch = 1;
}
}
/* The ']' character is simply dropped from the input */
}
reduced[j] = '\0';
/* the character '[' in the reduced string refers to the FNC1 character */
return 0;
}
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