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https://git.code.sf.net/p/zint/code
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95 lines
3 KiB
C
95 lines
3 KiB
C
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/* gs1.c - Verifies GS1 data */
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/*
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libzint - the open source barcode library
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Copyright (C) 2009 Robin Stuart <robin@zint.org.uk>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <string.h>
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#include <stdlib.h>
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#include "common.h"
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int gs1_verify(struct zint_symbol *symbol, unsigned char source[], char reduced[])
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{
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int i, j, last_ai, ai_latch;
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char ai_string[4];
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/* Detect extended ASCII characters */
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for(i = 0; i < sourcelen; i++) {
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if(source[i] >=128) {
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strcpy(symbol->errtxt, "Extended ASCII characters are not supported by GS1");
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return ERROR_INVALID_DATA;
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}
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}
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/* Start with basic tests */
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if(source[0] != '[') {
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strcpy(symbol->errtxt, "Data does not start with an AI");
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return ERROR_INVALID_DATA;
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}
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for(i = 0; i < ustrlen(source) - 1; i++) {
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if((source[i] == '[') && (source[i + 1] == '[')) {
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/* Can't have nested brackets - Quit */
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strcpy(symbol->errtxt, "Nested AI detected (two or more open brackets)");
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return ERROR_INVALID_DATA;
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}
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}
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for(i = 0; i < ustrlen(source) - 1; i++) {
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if((source[i] == ']') && (source[i + 1] == ']')) {
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/* Can't have nested brackets - Quit */
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strcpy(symbol->errtxt, "Nested AI detected (two or more close brackets)");
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return ERROR_INVALID_DATA;
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}
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}
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/* Resolve AI data - put resulting string in 'reduced' */
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j = 0;
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last_ai = 0;
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ai_latch = 1;
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for(i = 0; i < ustrlen(source); i++) {
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if((source[i] != '[') && (source[i] != ']')) {
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reduced[j] = source[i];
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j++;
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}
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if(source[i] == '[') {
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/* Start of an AI string */
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if(ai_latch == 0) {
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reduced[j] = '[';
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j++;
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}
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ai_string[0] = source[i + 1];
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ai_string[1] = source[i + 2];
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ai_string[2] = '\0';
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last_ai = atoi(ai_string);
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ai_latch = 0;
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/* The following values from GS1 specification figure 5.3.8.2.1 - 1
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"Element Strings with Pre-Defined Length Using Application Identifiers" */
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if((last_ai >= 0) && (last_ai <= 4)) { ai_latch = 1; }
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if((last_ai >= 11) && (last_ai <= 20)) { ai_latch = 1; }
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if(last_ai == 23) { ai_latch = 1; } /* legacy support - see 5.3.8.2.2 */
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if((last_ai >= 31) && (last_ai <= 36)) { ai_latch = 1; }
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if(last_ai == 41) { ai_latch = 1; }
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}
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/* The ']' character is simply dropped from the input */
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}
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reduced[j] = '\0';
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/* the character '[' in the reduced string refers to the FNC1 character */
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return 0;
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}
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