in Sharing/Src/External/zint-2.4.3/src/backend/code128.c [218:608]
int code_128(struct zint_symbol *symbol, unsigned char source[], int length)
{ /* Handle Code 128 and NVE-18 */
int i, j, k,values[170] = { 0 }, bar_characters, read, total_sum;
int error_number, indexchaine, indexliste, sourcelen, f_state;
char set[170] = { ' ' }, fset[170] = { ' ' }, mode, last_set, current_set = ' ';
float glyph_count;
char dest[1000];
error_number = 0;
strcpy(dest, "");
sourcelen = length;
j = 0;
bar_characters = 0;
f_state = 0;
if(sourcelen > 160) {
/* This only blocks rediculously long input - the actual length of the
resulting barcode depends on the type of data, so this is trapped later */
strcpy(symbol->errtxt, "Input too long");
return ZINT_ERROR_TOO_LONG;
}
/* Detect extended ASCII characters */
for(i = 0; i < sourcelen; i++) {
if(source[i] >= 128)
fset[i] = 'f';
}
fset[i] = '\0';
/* Decide when to latch to extended mode - Annex E note 3 */
j = 0;
for(i = 0; i < sourcelen; i++) {
if(fset[i] == 'f') {
j++;
} else {
j = 0;
}
if(j >= 5) {
for(k = i; k > (i - 5); k--) {
fset[k] = 'F';
}
}
if((j >= 3) && (i == (sourcelen - 1))) {
for(k = i; k > (i - 3); k--) {
fset[k] = 'F';
}
}
}
/* Decide if it is worth reverting to 646 encodation for a few characters as described in 4.3.4.2 (d) */
for(i = 1; i < sourcelen; i++) {
if((fset[i - 1] == 'F') && (fset[i] == ' ')) {
/* Detected a change from 8859-1 to 646 - count how long for */
for(j = 0; (fset[i + j] == ' ') && ((i + j) < sourcelen); j++);
if((j < 5) || ((j < 3) && ((i + j) == (sourcelen - 1)))) {
/* Uses the same figures recommended by Annex E note 3 */
/* Change to shifting back rather than latching back */
for(k = 0; k < j; k++) {
fset[i + k] = 'n';
}
}
}
}
/* Decide on mode using same system as PDF417 and rules of ISO 15417 Annex E */
indexliste = 0;
indexchaine = 0;
mode = parunmodd(source[indexchaine]);
if((symbol->symbology == BARCODE_CODE128B) && (mode == ABORC)) {
mode = AORB;
}
for(i = 0; i < 170; i++) {
list[0][i] = 0;
}
do {
list[1][indexliste] = mode;
while ((list[1][indexliste] == mode) && (indexchaine < sourcelen)) {
list[0][indexliste]++;
indexchaine++;
mode = parunmodd(source[indexchaine]);
if((symbol->symbology == BARCODE_CODE128B) && (mode == ABORC)) {
mode = AORB;
}
}
indexliste++;
} while (indexchaine < sourcelen);
dxsmooth(&indexliste);
/* Resolve odd length LATCHC blocks */
if((list[1][0] == LATCHC) && (list[0][0] & 1)) {
/* Rule 2 */
list[0][1]++;
list[0][0]--;
if(indexliste == 1) {
list[0][1] = 1;
list[1][1] = LATCHB;
indexliste = 2;
}
}
if(indexliste > 1) {
for(i = 1; i < indexliste; i++) {
if((list[1][i] == LATCHC) && (list[0][i] & 1)) {
/* Rule 3b */
list[0][i - 1]++;
list[0][i]--;
}
}
}
/* Put set data into set[] */
read = 0;
for(i = 0; i < indexliste; i++) {
for(j = 0; j < list[0][i]; j++) {
switch(list[1][i]) {
case SHIFTA: set[read] = 'a'; break;
case LATCHA: set[read] = 'A'; break;
case SHIFTB: set[read] = 'b'; break;
case LATCHB: set[read] = 'B'; break;
case LATCHC: set[read] = 'C'; break;
}
read++;
}
}
/* Adjust for strings which start with shift characters - make them latch instead */
if(set[0] == 'a') {
i = 0;
do {
set[i] = 'A';
i++;
} while (set[i] == 'a');
}
if(set[0] == 'b') {
i = 0;
do {
set[i] = 'B';
i++;
} while (set[i] == 'b');
}
/* Now we can calculate how long the barcode is going to be - and stop it from
being too long */
last_set = ' ';
glyph_count = 0.0;
for(i = 0; i < sourcelen; i++) {
if((set[i] == 'a') || (set[i] == 'b')) {
glyph_count = glyph_count + 1.0;
}
if((fset[i] == 'f') || (fset[i] == 'n')) {
glyph_count = glyph_count + 1.0;
}
if(((set[i] == 'A') || (set[i] == 'B')) || (set[i] == 'C')) {
if(set[i] != last_set) {
last_set = set[i];
glyph_count = glyph_count + 1.0;
}
}
if(i == 0) {
if(fset[i] == 'F') {
glyph_count = glyph_count + 2.0;
}
} else {
if((fset[i] == 'F') && (fset[i - 1] != 'F')) {
glyph_count = glyph_count + 2.0;
}
if((fset[i] != 'F') && (fset[i - 1] == 'F')) {
glyph_count = glyph_count + 2.0;
}
}
if(set[i] == 'C') {
glyph_count = glyph_count + 0.5;
} else {
glyph_count = glyph_count + 1.0;
}
}
if(glyph_count > 80.0) {
strcpy(symbol->errtxt, "Input too long");
return ZINT_ERROR_TOO_LONG;
}
/* So now we know what start character to use - we can get on with it! */
if(symbol->output_options & READER_INIT) {
/* Reader Initialisation mode */
switch(set[0]) {
case 'A': /* Start A */
concat(dest, C128Table[103]);
values[0] = 103;
current_set = 'A';
concat(dest, C128Table[96]); /* FNC3 */
values[1] = 96;
bar_characters++;
break;
case 'B': /* Start B */
concat(dest, C128Table[104]);
values[0] = 104;
current_set = 'B';
concat(dest, C128Table[96]); /* FNC3 */
values[1] = 96;
bar_characters++;
break;
case 'C': /* Start C */
concat(dest, C128Table[104]); /* Start B */
values[0] = 105;
concat(dest, C128Table[96]); /* FNC3 */
values[1] = 96;
concat(dest, C128Table[99]); /* Code C */
values[2] = 99;
bar_characters += 2;
current_set = 'C';
break;
}
} else {
/* Normal mode */
switch(set[0]) {
case 'A': /* Start A */
concat(dest, C128Table[103]);
values[0] = 103;
current_set = 'A';
break;
case 'B': /* Start B */
concat(dest, C128Table[104]);
values[0] = 104;
current_set = 'B';
break;
case 'C': /* Start C */
concat(dest, C128Table[105]);
values[0] = 105;
current_set = 'C';
break;
}
}
bar_characters++;
last_set = set[0];
if(fset[0] == 'F') {
switch(current_set) {
case 'A':
concat(dest, C128Table[101]);
concat(dest, C128Table[101]);
values[bar_characters] = 101;
values[bar_characters + 1] = 101;
break;
case 'B':
concat(dest, C128Table[100]);
concat(dest, C128Table[100]);
values[bar_characters] = 100;
values[bar_characters + 1] = 100;
break;
}
bar_characters += 2;
f_state = 1;
}
/* Encode the data */
read = 0;
do {
if((read != 0) && (set[read] != current_set))
{ /* Latch different code set */
switch(set[read])
{
case 'A': concat(dest, C128Table[101]);
values[bar_characters] = 101;
bar_characters++;
current_set = 'A';
break;
case 'B': concat(dest, C128Table[100]);
values[bar_characters] = 100;
bar_characters++;
current_set = 'B';
break;
case 'C': concat(dest, C128Table[99]);
values[bar_characters] = 99;
bar_characters++;
current_set = 'C';
break;
}
}
if(read != 0) {
if((fset[read] == 'F') && (f_state == 0)) {
/* Latch beginning of extended mode */
switch(current_set) {
case 'A':
concat(dest, C128Table[101]);
concat(dest, C128Table[101]);
values[bar_characters] = 101;
values[bar_characters + 1] = 101;
break;
case 'B':
concat(dest, C128Table[100]);
concat(dest, C128Table[100]);
values[bar_characters] = 100;
values[bar_characters + 1] = 100;
break;
}
bar_characters += 2;
f_state = 1;
}
if((fset[read] == ' ') && (f_state == 1)) {
/* Latch end of extended mode */
switch(current_set) {
case 'A':
concat(dest, C128Table[101]);
concat(dest, C128Table[101]);
values[bar_characters] = 101;
values[bar_characters + 1] = 101;
break;
case 'B':
concat(dest, C128Table[100]);
concat(dest, C128Table[100]);
values[bar_characters] = 100;
values[bar_characters + 1] = 100;
break;
}
bar_characters += 2;
f_state = 0;
}
}
if((fset[read] == 'f') || (fset[read] == 'n')) {
/* Shift to or from extended mode */
switch(current_set) {
case 'A':
concat(dest, C128Table[101]); /* FNC 4 */
values[bar_characters] = 101;
break;
case 'B':
concat(dest, C128Table[100]); /* FNC 4 */
values[bar_characters] = 100;
break;
}
bar_characters++;
}
if((set[read] == 'a') || (set[read] == 'b')) {
/* Insert shift character */
concat(dest, C128Table[98]);
values[bar_characters] = 98;
bar_characters++;
}
switch(set[read])
{ /* Encode data characters */
case 'a':
case 'A': c128_set_a(source[read], dest, values, &bar_characters);
read++;
break;
case 'b':
case 'B': c128_set_b(source[read], dest, values, &bar_characters);
read++;
break;
case 'C': c128_set_c(source[read], source[read + 1], dest, values, &bar_characters);
read += 2;
break;
}
} while (read < sourcelen);
/* check digit calculation */
total_sum = 0;
/*for(i = 0; i < bar_characters; i++) {
printf("%d\n", values[i]);
}*/
for(i = 0; i < bar_characters; i++)
{
if(i > 0)
{
values[i] *= i;
}
total_sum += values[i];
}
concat(dest, C128Table[total_sum%103]);
/* Stop character */
concat(dest, C128Table[106]);
expand(symbol, dest);
return error_number;
}