mirrors/zint-barcode-generator
1
0
Fork 0
mirror of https://git.code.sf.net/p/zint/code synced 2025-05-16 16:14:36 -04:00
Code Issues Projects Releases Packages Wiki Activity

Moved GS1 processing to gs1.c

Browse source
This commit is contained in:
hooper114 2009-01-08 08:43:25 +00:00
parent 4297b90cd3
commit 9c2fbd9e11
6 changed files with 190 additions and 228 deletions
Download patch file Download diff file Expand all files Collapse all files

95
backend/gs1.c Normal file
View file

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