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zint/backend/blockf.c

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/* blockf.c - Codablock F */
/*
libzint - the open source barcode library
Copyright (C) 2008 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 <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "common.h"
#define TRUE 1
#define FALSE 0
#define SHIFTA 90
#define LATCHA 91
#define SHIFTB 92
#define LATCHB 93
#define SHIFTC 94
#define LATCHC 95
#define AORB 96
#define ABORC 97
#define CANDB 98
#define CANDBB 99
#define MODEA 98
#define MODEB 100
#define MODEC 99
/* Annex A Table A.1 */
static char *C128Table[107] = {"212222", "222122", "222221", "121223", "121322", "131222", "122213",
"122312", "132212", "221213", "221312", "231212", "112232", "122132", "122231", "113222",
"123122", "123221", "223211", "221132", "221231", "213212", "223112", "312131", "311222",
"321122", "321221", "312212", "322112", "322211", "212123", "212321", "232121", "111323",
"131123", "131321", "112313", "132113", "132311", "211313", "231113", "231311", "112133",
"112331", "132131", "113123", "113321", "133121", "313121", "211331", "231131", "213113",
"213311", "213131", "311123", "311321", "331121", "312113", "312311", "332111", "314111",
"221411", "431111", "111224", "111422", "121124", "121421", "141122", "141221", "112214",
"112412", "122114", "122411", "142112", "142211", "241211", "221114", "413111", "241112",
"134111", "111242", "121142", "121241", "114212", "124112", "124211", "411212", "421112",
"421211", "212141", "214121", "412121", "111143", "111341", "131141", "114113", "114311",
"411113", "411311", "113141", "114131", "311141", "411131", "211412", "211214", "211232",
"2331112"};
int parunmodd(unsigned char llyth, char nullchar);
void grwp(int *indexliste);
void dxsmooth(int *indexliste);
int a3_convert(unsigned char source, char nullchar) {
/* Annex A section 3 */
if(source == nullchar) { return 64; }
if(source < 32) { return source + 64; }
if((source >= 32) && (source <= 127)) { return source - 32; }
if((source >= 128) && (source <= 159)) { return (source - 128) + 64; }
/* if source >= 160 */
return (source - 128) - 32;
}
int character_subset_select(unsigned char source[], int input_position, char nullchar) {
/* Section 4.5.2 - Determining the Character Subset Selector in a Row */
if(source[input_position] == nullchar) {
/* NULL character */
return MODEA;
}
if((source[input_position] >= '0') && (source[input_position + 1] <= '9')) {
/* Rule 1 */
return MODEC;
}
if((source[input_position] >= 128) && (source[input_position] <= 160)) {
/* Rule 2 (i) */
return MODEA;
}
if((source[input_position] >= 0) && (source[input_position] <= 31)) {
/* Rule 3 */
return MODEA;
}
/* Rule 4 */
return MODEB;
}
int data_encode_blockf(unsigned char source[], int subset_selector[], int blockmatrix[][62], int *columns_needed, int *rows_needed, int *final_mode, char nullchar, int gs1)
{
int i, j, input_position, input_length, current_mode, current_row, error_number;
int column_position, c, done, exit_status;
error_number = 0;
exit_status = 0;
current_row = 0;
current_mode = MODEA;
input_length = ustrlen(source);
column_position = 0;
input_position = 0;
done = 0;
c = 0;
do {
done = 0;
/* 'done' ensures that the instructions are followed in the correct order for each input character */
if(column_position == 0) {
/* The Beginning of a row */
c = (*columns_needed);
current_mode = character_subset_select(source, input_position, nullchar);
subset_selector[current_row] = current_mode;
if((current_row == 0) && gs1) {
/* Section 4.4.7.1 */
blockmatrix[current_row][column_position] = 102; /* FNC1 */
column_position++;
c--;
}
}
if(gs1 && (source[input_position] == '[')) {
blockmatrix[current_row][column_position] = 102; /* FNC1 */
column_position++;
c--;
input_position++;
done = 1;
}
if(done == 0) {
if(c <= 2) {
/* Annex B section 1 rule 1 */
/* Ensure that there is sufficient encodation capacity to continue (using the rules of Annex B.2). */
switch(current_mode) {
case MODEA: /* Table B1 applies */
if(parunmodd(source[input_position], nullchar) == ABORC) {
blockmatrix[current_row][column_position] = a3_convert(source[input_position], nullchar);
column_position++;
c--;
input_position++;
done = 1;
}
if((parunmodd(source[input_position], nullchar) == SHIFTB) && (c == 1)) {
/* Needs two symbols */
blockmatrix[current_row][column_position] = 100; /* Code B */
column_position++;
c--;
done = 1;
}
if((source[input_position] >= 244) && (done == 0)) {
/* Needs three symbols */
blockmatrix[current_row][column_position] = 100; /* Code B */
column_position++;
c--;
if(c == 1) {
blockmatrix[current_row][column_position] = 101; /* Code A */
column_position++;
c--;
}
done = 1;
}
if((source[input_position] >= 128) && (done == 0)) {
/* Needs two symbols */
if(c == 1) {
blockmatrix[current_row][column_position] = 100; /* Code B */
column_position++;
c--;
done = 1;
}
}
break;
case MODEB: /* Table B2 applies */
if(parunmodd(source[input_position], nullchar) == ABORC) {
blockmatrix[current_row][column_position] = a3_convert(source[input_position], nullchar);
column_position++;
c--;
input_position++;
done = 1;
}
if((parunmodd(source[input_position], nullchar) == SHIFTA) && (c == 1)) {
/* Needs two symbols */
blockmatrix[current_row][column_position] = 101; /* Code A */
column_position++;
c--;
done = 1;
}
if(((source[input_position] >= 128) && (source[input_position] <= 159)) && (done == 0)) {
/* Needs three symbols */
blockmatrix[current_row][column_position] = 101; /* Code A */
column_position++;
c--;
if(c == 1) {
blockmatrix[current_row][column_position] = 100; /* Code B */
column_position++;
c--;
}
done = 1;
}
if((source[input_position] >= 160) && (done == 0)) {
/* Needs two symbols */
if(c == 1) {
blockmatrix[current_row][column_position] = 101; /* Code A */
column_position++;
c--;
done = 1;
}
}
break;
case MODEC: /* Table B3 applies */
if((parunmodd(source[input_position], nullchar) != ABORC) && (c == 1)) {
/* Needs two symbols */
blockmatrix[current_row][column_position] = 101; /* Code A */
column_position++;
c--;
done = 1;
}
if(((parunmodd(source[input_position], nullchar) == ABORC) && (parunmodd(source[input_position + 1], nullchar) != ABORC))
&& (c == 1)) {
/* Needs two symbols */
blockmatrix[current_row][column_position] = 101; /* Code A */
column_position++;
c--;
done = 1;
}
if(source[input_position] >= 128) {
/* Needs three symbols */
blockmatrix[current_row][column_position] = 101; /* Code A */
column_position++;
c--;
if(c == 1) {
blockmatrix[current_row][column_position] = 100; /* Code B */
column_position++;
c--;
}
}
break;
}
}
}
if(done == 0) {
if(((parunmodd(source[input_position], nullchar) == AORB) || (parunmodd(source[input_position], nullchar) == SHIFTA)) && (current_mode == MODEA)) {
/* Annex B section 1 rule 2 */
/* If in Code Subset A and the next data character can be encoded in Subset A encode the next
character. */
if(source[input_position] >= 128) {
/* Extended ASCII character */
blockmatrix[current_row][column_position] = 101; /* FNC4 */
column_position++;
c--;
}
blockmatrix[current_row][column_position] = a3_convert(source[input_position], nullchar);
column_position++;
c--;
input_position++;
done = 1;
}
}
if(done == 0) {
if(((parunmodd(source[input_position], nullchar) == AORB) || (parunmodd(source[input_position], nullchar) == SHIFTB)) && (current_mode == MODEB)) {
/* Annex B section 1 rule 3 */
/* If in Code Subset B and the next data character can be encoded in subset B, encode the next
character. */
if(source[input_position] >= 128) {
/* Extended ASCII character */
blockmatrix[current_row][column_position] = 100; /* FNC4 */
column_position++;
c--;
}
blockmatrix[current_row][column_position] = a3_convert(source[input_position], nullchar);
column_position++;
c--;
input_position++;
done = 1;
}
}
if(done == 0) {
if(((parunmodd(source[input_position], nullchar) == ABORC) && (parunmodd(source[input_position + 1], nullchar) == ABORC)) && (current_mode == MODEC)) {
/* Annex B section 1 rule 4 */
/* If in Code Subset C and the next data are 2 digits, encode them. */
blockmatrix[current_row][column_position] = (ctoi(source[input_position]) * 10) + ctoi(source[input_position + 1]);
column_position++;
c--;
input_position += 2;
done = 1;
}
}
if(done == 0) {
if(((current_mode == MODEA) || (current_mode == MODEB)) && ((parunmodd(source[input_position], nullchar) == ABORC) || (gs1 && (source[input_position] == '[')))) {
/* Count the number of numeric digits */
/* If 4 or more numeric data characters occur together when in subsets A or B:
a. If there is an even number of numeric data characters, insert a Code C character before the
first numeric digit to change to subset C.
b. If there is an odd number of numeric data characters, insert a Code Set C character immedi-
ately after the first numeric digit to change to subset C. */
i = 0;
j = 0;
do {
i++;
if(gs1 && (source[input_position + j] == '[')) { i++; }
j++;
} while((parunmodd(source[input_position + j], nullchar) == ABORC) || (gs1 && (source[input_position + j] == '[')));
i--;
if(i >= 4) {
/* Annex B section 1 rule 5 */
if((i % 2) == 1) {
/* Annex B section 1 rule 5a */
blockmatrix[current_row][column_position] = 99; /* Code C */
column_position++;
c--;
blockmatrix[current_row][column_position] = (ctoi(source[input_position]) * 10) + ctoi(source[input_position + 1]);
column_position++;
c--;
input_position += 2;
current_mode = MODEC;
} else {
/* Annex B section 1 rule 5b */
blockmatrix[current_row][column_position] = a3_convert(source[input_position], nullchar);
column_position++;
c--;
input_position++;
}
done = 1;
} else {
blockmatrix[current_row][column_position] = a3_convert(source[input_position], nullchar);
column_position++;
c--;
input_position++;
done = 1;
}
}
}
if(done == 0) {
if((current_mode == MODEB) && (parunmodd(source[input_position], nullchar) == SHIFTA)) {
/* Annex B section 1 rule 6 */
/* When in subset B and an ASCII control character occurs in the data:
a. If there is a lower case character immediately following the control character, insert a Shift
character before the control character.
b. Otherwise, insert a Code A character before the control character to change to subset A. */
if((source[input_position + 1] >= 96) && (source[input_position + 1] <= 127)) {
/* Annex B section 1 rule 6a */
blockmatrix[current_row][column_position] = 98; /* Shift */
column_position++;
c--;
if(source[input_position] >= 128) {
/* Extended ASCII character */
blockmatrix[current_row][column_position] = 100; /* FNC4 */
column_position++;
c--;
}
blockmatrix[current_row][column_position] = a3_convert(source[input_position], nullchar);
column_position++;
c--;
input_position++;
} else {
/* Annex B section 1 rule 6b */
blockmatrix[current_row][column_position] = 101; /* Code A */
column_position++;
c--;
if(source[input_position] >= 128) {
/* Extended ASCII character */
blockmatrix[current_row][column_position] = 100; /* FNC4 */
column_position++;
c--;
}
blockmatrix[current_row][column_position] = a3_convert(source[input_position], nullchar);
column_position++;
c--;
input_position++;
current_mode = MODEA;
}
done = 1;
}
}
if(done == 0) {
if((current_mode == MODEA) && (parunmodd(source[input_position], nullchar) == SHIFTB)) {
/* Annex B section 1 rule 7 */
/* When in subset A and a lower case character occurs in the data:
a. If following that character, a control character occurs in the data before the occurrence of
another lower case character, insert a Shift character before the lower case character.
b. Otherwise, insert a Code B character before the lower case character to change to subset B. */
if((parunmodd(source[input_position + 1], nullchar) == SHIFTA) &&
(parunmodd(source[input_position + 2], nullchar) == SHIFTB)) {
/* Annex B section 1 rule 7a */
blockmatrix[current_row][column_position] = 98; /* Shift */
column_position++;
c--;
if(source[input_position] >= 128) {
/* Extended ASCII character */
blockmatrix[current_row][column_position] = 101; /* FNC4 */
column_position++;
c--;
}
blockmatrix[current_row][column_position] = a3_convert(source[input_position], nullchar);
column_position++;
c--;
input_position++;
} else {
/* Annex B section 1 rule 7b */
blockmatrix[current_row][column_position] = 100; /* Code B */
column_position++;
c--;
if(source[input_position] >= 128) {
/* Extended ASCII character */
blockmatrix[current_row][column_position] = 101; /* FNC4 */
column_position++;
c--;
}
blockmatrix[current_row][column_position] = a3_convert(source[input_position], nullchar);
column_position++;
c--;
input_position++;
current_mode = MODEB;
}
done = 1;
}
}
if(done == 0) {
if((current_mode == MODEC) && ((parunmodd(source[input_position], nullchar) != ABORC) ||
(parunmodd(source[input_position + 1], nullchar) != ABORC))) {
/* Annex B section 1 rule 8 */
/* When in subset C and a non-numeric character (or a single digit) occurs in the data, insert a Code
A or Code B character before that character, following rules 8a and 8b to determine between code
subsets A and B.
a. If an ASCII control character (eg NUL) occurs in the data before any lower case character, use
Code A.
b. Otherwise use Code B. */
if(parunmodd(source[input_position], nullchar) == SHIFTA) {
/* Annex B section 1 rule 8a */
blockmatrix[current_row][column_position] = 101; /* Code A */
column_position++;
c--;
if(source[input_position] >= 128) {
/* Extended ASCII character */
blockmatrix[current_row][column_position] = 101; /* FNC4 */
column_position++;
c--;
}
blockmatrix[current_row][column_position] = a3_convert(source[input_position], nullchar);
column_position++;
c--;
input_position++;
current_mode = MODEA;
} else {
/* Annex B section 1 rule 8b */
blockmatrix[current_row][column_position] = 100; /* Code B */
column_position++;
c--;
if(source[input_position] >= 128) {
/* Extended ASCII character */
blockmatrix[current_row][column_position] = 100; /* FNC4 */
column_position++;
c--;
}
blockmatrix[current_row][column_position] = a3_convert(source[input_position], nullchar);
column_position++;
c--;
input_position++;
current_mode = MODEB;
}
done = 1;
}
}
if(input_position == input_length) {
/* End of data - Annex B rule 5a */
if (c == 1) {
if(current_mode == MODEA) {
blockmatrix[current_row][column_position] = 100; /* Code B */
current_mode = MODEB;
} else {
blockmatrix[current_row][column_position] = 101; /* Code A */
current_mode = MODEA;
}
column_position++;
c--;
}
if (c == 0) {
/* Another row is needed */
column_position = 0;
c = (*columns_needed);
current_row++;
subset_selector[current_row] = MODEA;
current_mode = MODEA;
}
if (c > 2) {
/* Fill up the last row */
do {
if(current_mode == MODEA) {
blockmatrix[current_row][column_position] = 100; /* Code B */
current_mode = MODEB;
} else {
blockmatrix[current_row][column_position] = 101; /* Code A */
current_mode = MODEA;
}
column_position++;
c--;
} while (c > 2);
}
/* If (c == 2) { do nothing } */
exit_status = 1;
*(final_mode) = current_mode;
} else {
if(c <= 0) {
/* Start new row - Annex B rule 5b */
column_position = 0;
current_row++;
if(current_row > 43) {
return ERROR_TOO_LONG;
}
}
}
} while (exit_status == 0);
if(current_row == 0) {
/* fill up the first row */
for(c = column_position; c <= *(columns_needed); c++) {
if(current_mode == MODEA) {
blockmatrix[current_row][c] = 100; /* Code B */
current_mode = MODEB;
} else {
blockmatrix[current_row][c] = 101; /* Code A */
current_mode = MODEA;
}
}
current_row++;
/* add a second row */
subset_selector[current_row] = MODEA;
current_mode = MODEA;
for(c = 0; c <= *(columns_needed) - 2; c++) {
if(current_mode == MODEA) {
blockmatrix[current_row][c] = 100; /* Code B */
current_mode = MODEB;
} else {
blockmatrix[current_row][c] = 101; /* Code A */
current_mode = MODEA;
}
}
}
*(rows_needed) = current_row + 1;
return error_number;
}
int codablock(struct zint_symbol *symbol, unsigned char source[])
{
int error_number, input_length, i, j, k;
int rows_needed, columns_needed;
int min_module_height;
int last_mode, this_mode, final_mode;
float estimate_codelength;
int blockmatrix[44][62];
char row_pattern[750];
int subset_selector[44], row_indicator[44], row_check[44];
long int k1_sum, k2_sum;
int k1_check, k2_check;
int gs1;
error_number = 0;
input_length = ustrlen(source);
final_mode = MODEA;
if(input_length > 5450) {
strcpy(symbol->errtxt, "Input data too long [741]");
return ERROR_TOO_LONG;
}
if(symbol->input_mode == GS1_MODE) { gs1 = 1; } else { gs1 = 0; }
/* Make a guess at how many characters will be needed to encode the data */
estimate_codelength = 0.0;
last_mode = AORB; /* Codablock always starts with Code A */
for(i = 0; i < input_length; i++) {
this_mode = parunmodd(source[i], symbol->nullchar);
if(this_mode != last_mode) {
estimate_codelength += 1.0;
}
if(this_mode != ABORC) {
estimate_codelength += 1.0;
} else {
estimate_codelength += 0.5;
}
if(source[i] > 127) {
estimate_codelength += 1.0;
}
last_mode = this_mode;
}
/* Decide symbol size based on the above guess */
rows_needed = 0.5 + sqrt((estimate_codelength + 2) / 1.45);
if(rows_needed < 2) { rows_needed = 2; }
if(rows_needed > 44) { rows_needed = 44; }
columns_needed = (estimate_codelength + 2) / rows_needed;
if(columns_needed < 4) { columns_needed = 4; }
if(columns_needed > 62) {
strcpy(symbol->errtxt, "Input data too long [742]");
return ERROR_TOO_LONG;
}
/* Encode the data */
error_number = data_encode_blockf(source, subset_selector, blockmatrix, &columns_needed, &rows_needed, &final_mode, symbol->nullchar, gs1);
if(error_number > 0) {
if(error_number == ERROR_TOO_LONG) {
strcpy(symbol->errtxt, "Input data too long [743]");
}
return error_number;
}
/* Add check digits - Annex F */
k1_sum = 0;
k2_sum = 0;
for(i = 0; i < input_length; i++) {
k1_sum += (i + 1) * source[i];
k2_sum += i * source[i];
}
k1_check = k1_sum % 86;
k2_check = k2_sum % 86;
if((final_mode == MODEA) || (final_mode == MODEB)) {
k1_check = k1_check + 64;
if(k1_check > 95) { k1_check -= 96; }
k2_check = k2_check + 64;
if(k2_check > 95) { k2_check -= 96; }
}
blockmatrix[rows_needed - 1][columns_needed - 2] = k1_check;
blockmatrix[rows_needed - 1][columns_needed - 1] = k2_check;
/* Calculate row height (4.6.1.a) */
min_module_height = (0.55 * (columns_needed + 3)) + 3;
if(min_module_height < 8) { min_module_height = 8; }
/* Encode the Row Indicator in the First Row of the Symbol - Table D2 */
if(subset_selector[0] == 99) {
/* Code C */
row_indicator[0] = rows_needed - 2;
} else {
/* Code A or B */
row_indicator[0] = rows_needed + 62;
if(row_indicator[0] > 95) {
row_indicator[0] -= 95;
}
}
/* Encode the Row Indicator in the Second and Subsequent Rows of the Symbol - Table D3 */
for(i = 1; i < rows_needed; i++) {
/* Note that the second row is row number 1 because counting starts from 0 */
if(subset_selector[i] == 99) {
/* Code C */
row_indicator[i] = i + 42;
} else {
/* Code A or B */
row_indicator[i] = i + 10;
}
}
/* Calculate row check digits - Annex E */
for(i = 0; i < rows_needed; i++) {
k = 103;
k += subset_selector[i];
k += 2 * row_indicator[i];
for(j = 0; j < columns_needed; j++) {
k+= (j + 3) * blockmatrix[i][j];
}
row_check[i] = k % 103;
}
/* Resolve the data into patterns and place in symbol structure */
for(i = 0; i < rows_needed; i++) {
int writer, flip_flop;
/*printf("row %d: ",i);
printf("103 %d %d [", subset_selector[i], row_indicator[i]);
for(j = 0; j < columns_needed; j++) {
printf("%d ",blockmatrix[i][j]);
}
printf("] %d 106\n", row_check[i]);*/
strcpy(row_pattern, "");
/* Start character */
concat(row_pattern, C128Table[103]); /* Always Start A */
concat(row_pattern, C128Table[subset_selector[i]]);
concat(row_pattern, C128Table[row_indicator[i]]);
for(j = 0; j < columns_needed; j++) {
concat(row_pattern, C128Table[blockmatrix[i][j]]);
}
concat(row_pattern, C128Table[row_check[i]]);
/* Stop character */
concat(row_pattern, C128Table[106]);
/* Write the information into the symbol */
writer = 0;
flip_flop = 1;
for (j = 0; j < strlen(row_pattern); j++) {
for(k = 0; k < ctoi(row_pattern[j]); k++) {
if(flip_flop == 1) {
symbol->encoded_data[i][writer] = '1';
writer++;
} else {
symbol->encoded_data[i][writer] = '0';
writer++;
}
}
if(flip_flop == 0) { flip_flop = 1; } else { flip_flop = 0; }
}
symbol->row_height[i] = min_module_height + 2;
}
symbol->border_width = 2;
symbol->output_options = BARCODE_BIND;
symbol->rows = rows_needed;
symbol->width = (11 * (columns_needed + 5)) + 2;
return error_number;
}
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