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Improved GS1 checking

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This commit is contained in:
hooper114 2009-01-11 07:42:10 +00:00
parent 3768b65d3e
commit 9425bf5946
1 changed files with 66 additions and 0 deletions
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66
backend/gs1.c
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@ -21,13 +21,20 @@
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include "common.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 */
int gs1_verify(struct zint_symbol *symbol, unsigned char source[], char reduced[])
{
int i, j, last_ai, ai_latch;
char ai_string[6];
int bracket_level, max_bracket_level, ai_length, max_ai_length, min_ai_length;
int ai_value[100], ai_location[100], ai_count, data_location[100], data_length[100];
int error_latch;
/* Detect extended ASCII characters */
for(i = 0; i < ustrlen(source); i++) {
@ -92,6 +99,65 @@ int gs1_verify(struct zint_symbol *symbol, unsigned char source[], char reduced[
return ERROR_INVALID_DATA;
}
ai_count = 0;
for(i = 1; i < ustrlen(source); 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] != '[') && (source[data_location[i] + data_length[i] - 1] != '\0'));
data_length[i]--;
}
error_latch = -1;
for(i = 0; i < ai_count; i++) {
switch (ai_value[i]) {
case 0: if(data_length[i] != 18) { error_latch = i; } break;
case 1: if(data_length[i] != 14) { error_latch = i; } break;
case 2: if(data_length[i] != 14) { error_latch = i; } break;
case 3: if(data_length[i] != 14) { error_latch = i; } break;
case 4: if(data_length[i] != 16) { error_latch = i; } break;
case 11: if(data_length[i] != 6) { error_latch = i; } break;
case 12: if(data_length[i] != 6) { error_latch = i; } break;
case 13: if(data_length[i] != 6) { error_latch = i; } break;
case 14: if(data_length[i] != 6) { error_latch = i; } break;
case 15: if(data_length[i] != 6) { error_latch = i; } break;
case 16: if(data_length[i] != 6) { error_latch = i; } break;
case 17: if(data_length[i] != 6) { error_latch = i; } break;
case 18: if(data_length[i] != 6) { error_latch = i; } break;
case 19: if(data_length[i] != 6) { error_latch = i; } break;
case 20: if(data_length[i] != 2) { error_latch = i; } break;
case 31: if(data_length[i] != 8) { error_latch = i; } break;
case 32: if(data_length[i] != 8) { error_latch = i; } break;
case 33: if(data_length[i] != 8) { error_latch = i; } break;
case 34: if(data_length[i] != 8) { error_latch = i; } break;
case 35: if(data_length[i] != 8) { error_latch = i; } break;
case 36: if(data_length[i] != 8) { error_latch = i; } break;
case 41: if(data_length[i] != 14) { error_latch = i; } break;
}
}
if(error_latch != -1) {
strcpy(symbol->errtxt, "Invalid data length for AI");
return ERROR_INVALID_DATA;
}
/* Resolve AI data - put resulting string in 'reduced' */
j = 0;
last_ai = 0;