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https://git.code.sf.net/p/zint/code
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Initial revision
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factor
commit
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backend
681
backend/maxicode.c
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681
backend/maxicode.c
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/* maxicode.c - Handles Maxicode */
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/*
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libzint - the open source barcode library
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Copyright (C) 2008 Robin Stuart <zint@hotmail.co.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
|
||||
GNU General Public License for more details.
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||||
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||||
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.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/* This code has been thoroughly checked against ISO/IEC 16023:2000 */
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#include "common.h"
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#include "maxicode.h"
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#include "reedsol.h"
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#include <string.h>
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int maxi_codeword[144];
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void maxi_do_primary_check( )
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{
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/* Handles error correction of primary message */
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char data[15];
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char results[15];
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int j;
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int datalen = 10;
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int ecclen = 10;
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rs_init_gf(0x43);
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rs_init_code(ecclen, 1);
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for(j = 0; j < datalen; j += 1)
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data[j] = maxi_codeword[j];
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rs_encode(datalen, data, results);
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for ( j = 0; j < ecclen; j += 1)
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maxi_codeword[ datalen + j] = results[j];
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}
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void maxi_do_secondary_chk_odd( int ecclen )
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{
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/* Handles error correction of odd characters in secondary */
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char data[100];
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char results[30];
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int j;
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int datalen = 68;
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rs_init_gf(0x43);
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rs_init_code(ecclen, 1);
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if (ecclen == 20)
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datalen = 84;
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for(j = 0; j < datalen; j += 1)
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if ((j % 2) == 1) // odd
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data[(j-1)/2] = maxi_codeword[j + 20];
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rs_encode(datalen/2, data, results);
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for ( j = 0; j < (ecclen); j += 1)
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maxi_codeword[ datalen + (2 *j) + 1 + 20 ] = results[j];
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}
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void maxi_do_secondary_chk_even(int ecclen )
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{
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/* Handles error correction of even characters in secondary */
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char data[100];
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char results[30];
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int j;
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int datalen = 68;
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if (ecclen == 20)
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datalen = 84;
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rs_init_gf(0x43);
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rs_init_code(ecclen, 1);
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for(j = 0; j < datalen + 1; j += 1)
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if ((j % 2) == 0) // even
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data[j/2] = maxi_codeword[j + 20];
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rs_encode(datalen/2, data, results);
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for ( j = 0; j < (ecclen); j += 1)
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maxi_codeword[ datalen + (2 *j) + 20] = results[j];
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}
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int maxi_bump(int set[], int character[], int bump_posn)
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{
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/* Moves everything up so that a shift or latch can be inserted */
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int i;
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for(i = 143; i > bump_posn; i--) {
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set[i] = set[i - 1];
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character[i] = character[i - 1];
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}
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}
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int maxi_text_process(int mode, unsigned char source[])
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{
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/* Format text according to Appendix A */
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/* This code doesn't make use of [Lock in C], [Lock in D]
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and [Lock in E] and so is not always the most efficient at
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compressing data, but should suffice for most applications */
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int set[144], character[144], i, j, done, count, length, current_set;
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length = strlen(source);
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if(length > 138) {
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return ERROR_TOO_LONG;
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}
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for(i = 0; i < 144; i++) {
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set[i] = -1;
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character[i] = 0;
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}
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for (i = 0; i < length; i++) {
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/* Look up characters in table from Appendix A - this gives
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value and code set for most characters */
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set[i] = maxiCodeSet[source[i]];
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character[i] = maxiSymbolChar[source[i]];
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}
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/* If a character can be represented in more than one code set,
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pick which version to use */
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if(set[0] == 0) {
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if(character[0] == 13) {
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character[0] = 0;
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}
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set[0] = 1;
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}
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for(i = 1; i < length; i++) {
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if(set[i] == 0) {
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done = 0;
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/* Special character */
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if(character[i] == 13) {
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/* Carriage Return */
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if(set[i - 1] == 5) {
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character[i] = 13;
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set[i] = 5;
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} else {
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if((i != length - 1) && (set[i + 1] == 5)) {
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character[i] = 13;
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set[i] = 5;
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} else {
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character[i] = 0;
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set[i] = 1;
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}
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}
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done = 1;
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}
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if((character[i] == 28) && (done == 0)) {
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/* FS */
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if(set[i - 1] == 5) {
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character[i] = 32;
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set[i] = 5;
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} else {
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set[i] = set[i - 1];
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}
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done = 1;
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}
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if((character[i] == 29) && (done == 0)) {
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/* GS */
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if(set[i - 1] == 5) {
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character[i] = 33;
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set[i] = 5;
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} else {
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set[i] = set[i - 1];
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}
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done = 1;
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}
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if((character[i] == 30) && (done == 0)) {
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/* RS */
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if(set[i - 1] == 5) {
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character[i] = 34;
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set[i] = 5;
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} else {
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set[i] = set[i - 1];
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}
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done = 1;
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}
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if((character[i] == 32) && (done == 0)) {
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/* Space */
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if(set[i - 1] == 1) {
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character[i] = 32;
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set[i] = 1;
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}
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if(set[i - 1] == 2) {
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character[i] = 47;
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set[i] = 2;
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}
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if(set[i - 1] >= 3) {
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if(i != length - 1) {
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if(set[i + 1] == 1) {
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character[i] = 32;
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set[i] = 1;
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}
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if(set[i + 1] == 2) {
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character[i] = 47;
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set[i] = 2;
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}
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if(set[i + 1] >= 3) {
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character[i] = 59;
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set[i] = set[i - 1];
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}
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} else {
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character[i] = 59;
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set[i] = set[i - 1];
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}
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}
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done = 1;
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}
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if((character[i] == 44) && (done == 0)) {
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/* Comma */
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if(set[i - 1] == 2) {
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character[i] = 48;
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set[i] = 2;
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} else {
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if((i != length - 1) && (set[i + 1] == 2)) {
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character[i] = 48;
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set[i] = 2;
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} else {
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set[i] = 1;
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}
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}
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done = 1;
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}
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if((character[i] == 46) && (done == 0)) {
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/* Full Stop */
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if(set[i - 1] == 2) {
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character[i] = 49;
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set[i] = 2;
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} else {
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if((i != length - 1) && (set[i + 1] == 2)) {
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character[i] = 49;
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set[i] = 2;
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} else {
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set[i] = 1;
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}
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}
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done = 1;
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}
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if((character[i] == 47) && (done == 0)) {
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/* Slash */
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if(set[i - 1] == 2) {
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character[i] = 50;
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set[i] = 2;
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} else {
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if((i != length - 1) && (set[i + 1] == 2)) {
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character[i] = 50;
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set[i] = 2;
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} else {
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set[i] = 1;
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}
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}
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done = 1;
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}
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if((character[i] == 58) && (done == 0)) {
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/* Colon */
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if(set[i - 1] == 2) {
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character[i] = 51;
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set[i] = 2;
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} else {
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if((i != length - 1) && (set[i + 1] == 2)) {
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character[i] = 51;
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set[i] = 2;
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} else {
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set[i] = 1;
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}
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}
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done = 1;
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}
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}
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}
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for(i = strlen(source); i < 144; i++) {
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/* Add the padding */
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if(set[length - 1] == 2) {
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set[i] = 2;
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} else {
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set[i] = 1;
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}
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character[i] = 33;
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}
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/* Find candidates for number compression */
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if((mode == 2) || (mode ==3)) { j = 0; } else { j = 9; }
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/* Number compression not allowed in primary message */
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count = 0;
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for(i = j; i < 143; i++) {
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if((set[i] == 1) && ((character[i] >= 48) && (character[i] <= 57))) {
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/* Character is a number */
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count++;
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} else {
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count = 0;
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}
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if(count == 9) {
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/* Nine digits in a row can be compressed */
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set[i] = 6;
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set[i - 1] = 6;
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set[i - 2] = 6;
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set[i - 3] = 6;
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set[i - 4] = 6;
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set[i - 5] = 6;
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set[i - 6] = 6;
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set[i - 7] = 6;
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set[i - 8] = 6;
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count = 0;
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}
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}
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|
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/* Add shift and latch characters */
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current_set = 1;
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i = 0;
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do {
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|
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if(set[i] != current_set) {
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switch(set[i]) {
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case 1:
|
||||
if(set[i + 1] == 1) {
|
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if(set[i + 2] == 1) {
|
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if(set[i + 3] == 1) {
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/* Latch A */
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maxi_bump(set, character, i);
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character[i] = 63;
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current_set = 1;
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length++;
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} else {
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/* 3 Shift A */
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maxi_bump(set, character, i);
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character[i] = 57;
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length++;
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i += 2;
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}
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} else {
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/* 2 Shift A */
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maxi_bump(set, character, i);
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character[i] = 56;
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length++;
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i++;
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}
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} else {
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/* Shift A */
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maxi_bump(set, character, i);
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character[i] = 59;
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length++;
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}
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break;
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case 2:
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if(set[i + 1] == 2) {
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/* Latch B */
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maxi_bump(set, character, i);
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character[i] = 63;
|
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current_set = 2;
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length++;
|
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} else {
|
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/* Shift B */
|
||||
maxi_bump(set, character, i);
|
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character[i] = 59;
|
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length++;
|
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}
|
||||
break;
|
||||
case 3:
|
||||
/* Shift C */
|
||||
maxi_bump(set, character, i);
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character[i] = 60;
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length++;
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break;
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||||
case 4:
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/* Shift D */
|
||||
maxi_bump(set, character, i);
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||||
character[i] = 61;
|
||||
length++;
|
||||
break;
|
||||
case 5:
|
||||
/* Shift E */
|
||||
maxi_bump(set, character, i);
|
||||
character[i] = 62;
|
||||
length++;
|
||||
break;
|
||||
case 6:
|
||||
/* Number Compressed */
|
||||
/* Do nothing */
|
||||
break;
|
||||
}
|
||||
i++;
|
||||
}
|
||||
i++;
|
||||
} while(i < 145);
|
||||
|
||||
/* Number compression has not been forgotten! - It's handled below */
|
||||
i = 0;
|
||||
do {
|
||||
if (set[i] == 6) {
|
||||
/* Number compression */
|
||||
char substring[10];
|
||||
int value;
|
||||
|
||||
for(j = 0; j < 10; j++) {
|
||||
substring[j] = character[i + j];
|
||||
}
|
||||
substring[10] = '\0';
|
||||
value = atoi(substring);
|
||||
|
||||
character[i] = 31; /* NS */
|
||||
character[i + 1] = (value & 0x3f000000) >> 24;
|
||||
character[i + 2] = (value & 0xfc0000) >> 18;
|
||||
character[i + 3] = (value & 0x3f000) >> 12;
|
||||
character[i + 4] = (value & 0xfc0) >> 6;
|
||||
character[i + 5] = (value & 0x3f);
|
||||
|
||||
i += 6;
|
||||
for(j = i; j < 140; j++) {
|
||||
set[j] = set[j + 3];
|
||||
character[j] = character[j + 3];
|
||||
}
|
||||
length -= 3;
|
||||
} else {
|
||||
i++;
|
||||
}
|
||||
} while (i <= 143);
|
||||
|
||||
if(((mode ==2) || (mode == 3)) && (length > 84)) {
|
||||
return ERROR_TOO_LONG;
|
||||
}
|
||||
|
||||
if(((mode == 4) || (mode == 6)) && (length > 93)) {
|
||||
return ERROR_TOO_LONG;
|
||||
}
|
||||
|
||||
if((mode == 5) && (length > 77)) {
|
||||
return ERROR_TOO_LONG;
|
||||
}
|
||||
|
||||
|
||||
/* Copy the encoded text into the codeword array */
|
||||
if((mode == 2) || (mode == 3)) {
|
||||
for(i = 0; i < 84; i++) { /* secondary only */
|
||||
maxi_codeword[i + 20] = character[i];
|
||||
}
|
||||
}
|
||||
|
||||
if((mode == 4) || (mode == 6)) {
|
||||
for(i = 0; i < 9; i++) { /* primary */
|
||||
maxi_codeword[i + 1] = character[i];
|
||||
}
|
||||
for(i = 0; i < 84; i++) { /* secondary */
|
||||
maxi_codeword[i + 20] = character[i + 9];
|
||||
}
|
||||
}
|
||||
|
||||
if(mode == 5) {
|
||||
for(i = 0; i < 9; i++) { /* primary */
|
||||
maxi_codeword[i + 1] = character[i];
|
||||
}
|
||||
for(i = 0; i < 68; i++) { /* secondary */
|
||||
maxi_codeword[i + 20] = character[i + 9];
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
void maxi_do_primary_2(char postcode[], int country, int service)
|
||||
{
|
||||
/* Format structured primary for Mode 2 */
|
||||
int postcode_length, postcode_num, i;
|
||||
|
||||
for(i = 0; i < 10; i++) {
|
||||
if((postcode[i] <= '0') || (postcode[i] >= '9')) {
|
||||
postcode[i] = '\0';
|
||||
}
|
||||
}
|
||||
|
||||
postcode_length = strlen(postcode);
|
||||
postcode_num = atoi(postcode);
|
||||
|
||||
maxi_codeword[0] = ((postcode_num & 0x03) << 4) | 2;
|
||||
maxi_codeword[1] = ((postcode_num & 0xfc) >> 2);
|
||||
maxi_codeword[2] = ((postcode_num & 0x3f00) >> 8);
|
||||
maxi_codeword[3] = ((postcode_num & 0xfc000) >> 14);
|
||||
maxi_codeword[4] = ((postcode_num & 0x3f00000) >> 20);
|
||||
maxi_codeword[5] = ((postcode_num & 0x3c000000) >> 26) | ((postcode_length & 0x3) << 4);
|
||||
maxi_codeword[6] = ((postcode_length & 0x3c) >> 2) | ((country & 0x3) << 4);
|
||||
maxi_codeword[7] = (country & 0xfc) >> 2;
|
||||
maxi_codeword[8] = ((country & 0x300) >> 8) | ((service & 0xf) << 2);
|
||||
maxi_codeword[9] = ((service & 0x3f0) >> 4);
|
||||
}
|
||||
|
||||
void maxi_do_primary_3(char postcode[], int country, int service)
|
||||
{
|
||||
/* Format structured primary for Mode 3 */
|
||||
int i;
|
||||
|
||||
to_upper(postcode);
|
||||
for(i = 0; i < strlen(postcode); i++) {
|
||||
if((postcode[i] >= 65) && (postcode[i] <= 90)) {
|
||||
/* (Capital) letters shifted to Code Set A values */
|
||||
postcode[i] = postcode[i] - 64;
|
||||
}
|
||||
if(((postcode[i] == 27) || (postcode[i] == 31)) || ((postcode[i] == 33) || (postcode[i] >= 59))) {
|
||||
/* Not a valid postcode character */
|
||||
postcode[i] = ' ';
|
||||
}
|
||||
/* Input characters lower than 27 (NUL - SUB) in postcode are
|
||||
interpreted as capital letters in Code Set A (e.g. LF becomes 'J') */
|
||||
}
|
||||
|
||||
maxi_codeword[0] = ((postcode[5] & 0x03) << 4) | 3;
|
||||
maxi_codeword[1] = ((postcode[4] & 0x03) << 4) | ((postcode[5] & 0x3c) >> 2);
|
||||
maxi_codeword[2] = ((postcode[3] & 0x03) << 4) | ((postcode[4] & 0x3c) >> 2);
|
||||
maxi_codeword[3] = ((postcode[2] & 0x03) << 4) | ((postcode[3] & 0x3c) >> 2);
|
||||
maxi_codeword[4] = ((postcode[1] & 0x03) << 4) | ((postcode[2] & 0x3c) >> 2);
|
||||
maxi_codeword[5] = ((postcode[0] & 0x03) << 4) | ((postcode[1] & 0x3c) >> 2);
|
||||
maxi_codeword[6] = ((postcode[0] & 0x3c) >> 2) | ((country & 0x3) << 4);
|
||||
maxi_codeword[7] = (country & 0xfc) >> 2;
|
||||
maxi_codeword[8] = ((country & 0x300) >> 8) | ((service & 0xf) << 2);
|
||||
maxi_codeword[9] = ((service & 0x3f0) >> 4);
|
||||
}
|
||||
|
||||
int maxicode(struct zint_symbol *symbol, unsigned char source[])
|
||||
{
|
||||
int i, j, block, bit, mode, countrycode = 0, service = 0;
|
||||
int bit_pattern[7], internal_error = 0, eclen;
|
||||
char postcode[12], countrystr[4], servicestr[4];
|
||||
mode = symbol->option_1;
|
||||
strcpy(postcode, "");
|
||||
strcpy(countrystr, "");
|
||||
strcpy(servicestr, "");
|
||||
|
||||
for(i = 0; i < 145; i++) {
|
||||
maxi_codeword[i] = 0;
|
||||
}
|
||||
|
||||
if(mode == -1) { /* If mode is unspecified */
|
||||
if(strlen(symbol->primary) == 0) {
|
||||
mode = 4;
|
||||
} else {
|
||||
mode = 2;
|
||||
for(i = 0; i < 10; i++) {
|
||||
if((symbol->primary[i] < 48) || (symbol->primary[i] > 57)) {
|
||||
mode = 3;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if((mode < 2) || (mode > 6)) { /* Only codes 2 to 6 supported */
|
||||
strcpy(symbol->errtxt, "Error: Invalid Maxicode Mode");
|
||||
return ERROR_INVALID_OPTION;
|
||||
}
|
||||
|
||||
if((mode == 2) || (mode == 3)) { /* Modes 2 and 3 need data in symbol->primary */
|
||||
if(strlen(symbol->primary) != 15) {
|
||||
strcpy(symbol->errtxt, "Error: Invalid Primary String");
|
||||
return ERROR_INVALID_DATA;
|
||||
}
|
||||
|
||||
for(i = 9; i < 15; i++) { /* check that country code and service are numeric */
|
||||
if((symbol->primary[i] < 48) || (symbol->primary[i] > 57)) {
|
||||
strcpy(symbol->errtxt, "Error: Invalid Primary String");
|
||||
return ERROR_INVALID_DATA;
|
||||
}
|
||||
}
|
||||
|
||||
strncpy(postcode, symbol->primary, 9);
|
||||
postcode[9] = '\0';
|
||||
|
||||
if(mode == 2) {
|
||||
for(i = 0; i < 10; i++) {
|
||||
if(postcode[i] == ' ') {
|
||||
postcode[i] = '\0';
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if(mode == 3) { postcode[6] = '\0'; }
|
||||
|
||||
countrystr[0] = symbol->primary[9];
|
||||
countrystr[1] = symbol->primary[10];
|
||||
countrystr[2] = symbol->primary[11];
|
||||
countrystr[3] = '\0';
|
||||
|
||||
servicestr[0] = symbol->primary[12];
|
||||
servicestr[1] = symbol->primary[13];
|
||||
servicestr[2] = symbol->primary[14];
|
||||
servicestr[3] = '\0';
|
||||
|
||||
countrycode = atoi(countrystr);
|
||||
service = atoi(servicestr);
|
||||
|
||||
if(mode == 2) { maxi_do_primary_2(postcode, countrycode, service); }
|
||||
if(mode == 3) { maxi_do_primary_3(postcode, countrycode, service); }
|
||||
} else {
|
||||
maxi_codeword[0] = mode;
|
||||
}
|
||||
|
||||
i = maxi_text_process(mode, source);
|
||||
if(i == ERROR_TOO_LONG ) {
|
||||
strcpy(symbol->errtxt, "Error: Input data too long");
|
||||
return i;
|
||||
}
|
||||
|
||||
/* All the data is sorted - now do error correction */
|
||||
maxi_do_primary_check(); /* always EEC */
|
||||
|
||||
if ( mode == 5 )
|
||||
eclen = 56; // 68 data codewords , 56 error corrections
|
||||
else
|
||||
eclen = 40; // 84 data codewords, 40 error corrections
|
||||
|
||||
maxi_do_secondary_chk_even(eclen/2); // do error correction of even
|
||||
maxi_do_secondary_chk_odd(eclen/2); // do error correction of odd
|
||||
|
||||
/* Copy data into symbol grid */
|
||||
for(i = 0; i < 33; i++) {
|
||||
for(j = 0; j < 30; j++) {
|
||||
symbol->encoded_data[i][j] = '0';
|
||||
block = (MaxiGrid[(i * 30) + j] + 5) / 6;
|
||||
bit = (MaxiGrid[(i * 30) + j] + 5) % 6;
|
||||
|
||||
if(block != 0) {
|
||||
|
||||
bit_pattern[0] = (maxi_codeword[block - 1] & 0x20) >> 5;
|
||||
bit_pattern[1] = (maxi_codeword[block - 1] & 0x10) >> 4;
|
||||
bit_pattern[2] = (maxi_codeword[block - 1] & 0x8) >> 3;
|
||||
bit_pattern[3] = (maxi_codeword[block - 1] & 0x4) >> 2;
|
||||
bit_pattern[4] = (maxi_codeword[block - 1] & 0x2) >> 1;
|
||||
bit_pattern[5] = (maxi_codeword[block - 1] & 0x1);
|
||||
|
||||
if(bit_pattern[bit] != 0) {
|
||||
symbol->encoded_data[i][j] = '1';
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* Add orientation markings */
|
||||
symbol->encoded_data[0][28] = '1'; // Top right filler
|
||||
symbol->encoded_data[0][29] = '1';
|
||||
symbol->encoded_data[9][10] = '1'; // Top left marker
|
||||
symbol->encoded_data[9][11] = '1';
|
||||
symbol->encoded_data[10][11] = '1';
|
||||
symbol->encoded_data[15][7] = '1'; // Left hand marker
|
||||
symbol->encoded_data[16][8] = '1';
|
||||
symbol->encoded_data[16][20] = '1'; // Right hand marker
|
||||
symbol->encoded_data[17][20] = '1';
|
||||
symbol->encoded_data[22][10] = '1'; // Bottom left marker
|
||||
symbol->encoded_data[23][10] = '1';
|
||||
symbol->encoded_data[22][17] = '1'; // Bottom right marker
|
||||
symbol->encoded_data[23][17] = '1';
|
||||
|
||||
symbol->width = 30;
|
||||
symbol->rows = 33;
|
||||
|
||||
return internal_error;
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue