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zint/backend/maxicode.c
Robin Stuart 9d1c20201d Add ECI encoding
2016-08-16 12:43:41 +01:00

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/* maxicode.c - Handles Maxicode */
/*
libzint - the open source barcode library
Copyright (C) 2010-2016 Robin Stuart <rstuart114@gmail.com>
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the name of the project nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
*/
/* Includes corrections thanks to Monica Swanson @ Source Technologies */
#include "common.h"
#include "maxicode.h"
#include "reedsol.h"
#include <string.h>
#include <stdlib.h>
int maxi_codeword[144];
/* Handles error correction of primary message */
void maxi_do_primary_check() {
unsigned char data[15];
unsigned char results[15];
int j;
int datalen = 10;
int ecclen = 10;
rs_init_gf(0x43);
rs_init_code(ecclen, 1);
for (j = 0; j < datalen; j += 1)
data[j] = maxi_codeword[j];
rs_encode(datalen, data, results);
for (j = 0; j < ecclen; j += 1)
maxi_codeword[ datalen + j] = results[ecclen - 1 - j];
rs_free();
}
/* Handles error correction of odd characters in secondary */
void maxi_do_secondary_chk_odd(int ecclen) {
unsigned char data[100];
unsigned char results[30];
int j;
int datalen = 68;
rs_init_gf(0x43);
rs_init_code(ecclen, 1);
if (ecclen == 20)
datalen = 84;
for (j = 0; j < datalen; j += 1)
if (j & 1) // odd
data[(j - 1) / 2] = maxi_codeword[j + 20];
rs_encode(datalen / 2, data, results);
for (j = 0; j < (ecclen); j += 1)
maxi_codeword[ datalen + (2 * j) + 1 + 20 ] = results[ecclen - 1 - j];
rs_free();
}
/* Handles error correction of even characters in secondary */
void maxi_do_secondary_chk_even(int ecclen) {
unsigned char data[100];
unsigned char results[30];
int j;
int datalen = 68;
if (ecclen == 20)
datalen = 84;
rs_init_gf(0x43);
rs_init_code(ecclen, 1);
for (j = 0; j < datalen + 1; j += 1)
if (!(j & 1)) // even
data[j / 2] = maxi_codeword[j + 20];
rs_encode(datalen / 2, data, results);
for (j = 0; j < (ecclen); j += 1)
maxi_codeword[ datalen + (2 * j) + 20] = results[ecclen - 1 - j];
rs_free();
}
/* Moves everything up so that a shift or latch can be inserted */
void maxi_bump(int set[], int character[], int bump_posn) {
int i;
for (i = 143; i > bump_posn; i--) {
set[i] = set[i - 1];
character[i] = character[i - 1];
}
}
/* Format text according to Appendix A */
int maxi_text_process(int mode, unsigned char source[], int length, int eci) {
/* This code doesn't make use of [Lock in C], [Lock in D]
and [Lock in E] and so is not always the most efficient at
compressing data, but should suffice for most applications */
int set[144], character[144], i, j, done, count, current_set;
if (length > 138) {
return ZINT_ERROR_TOO_LONG;
}
for (i = 0; i < 144; i++) {
set[i] = -1;
character[i] = 0;
}
for (i = 0; i < length; i++) {
/* Look up characters in table from Appendix A - this gives
value and code set for most characters */
set[i] = maxiCodeSet[source[i]];
character[i] = maxiSymbolChar[source[i]];
}
/* If a character can be represented in more than one code set,
pick which version to use */
if (set[0] == 0) {
if (character[0] == 13) {
character[0] = 0;
}
set[0] = 1;
}
for (i = 1; i < length; i++) {
if (set[i] == 0) {
done = 0;
/* Special character */
if (character[i] == 13) {
/* Carriage Return */
if (set[i - 1] == 5) {
character[i] = 13;
set[i] = 5;
} else {
if ((i != length - 1) && (set[i + 1] == 5)) {
character[i] = 13;
set[i] = 5;
} else {
character[i] = 0;
set[i] = 1;
}
}
done = 1;
}
if ((character[i] == 28) && (done == 0)) {
/* FS */
if (set[i - 1] == 5) {
character[i] = 32;
set[i] = 5;
} else {
set[i] = set[i - 1];
}
done = 1;
}
if ((character[i] == 29) && (done == 0)) {
/* GS */
if (set[i - 1] == 5) {
character[i] = 33;
set[i] = 5;
} else {
set[i] = set[i - 1];
}
done = 1;
}
if ((character[i] == 30) && (done == 0)) {
/* RS */
if (set[i - 1] == 5) {
character[i] = 34;
set[i] = 5;
} else {
set[i] = set[i - 1];
}
done = 1;
}
if ((character[i] == 32) && (done == 0)) {
/* Space */
if (set[i - 1] == 1) {
character[i] = 32;
set[i] = 1;
}
if (set[i - 1] == 2) {
character[i] = 47;
set[i] = 2;
}
if (set[i - 1] >= 3) {
if (i != length - 1) {
if (set[i + 1] == 1) {
character[i] = 32;
set[i] = 1;
}
if (set[i + 1] == 2) {
character[i] = 47;
set[i] = 2;
}
if (set[i + 1] >= 3) {
character[i] = 59;
set[i] = set[i - 1];
}
} else {
character[i] = 59;
set[i] = set[i - 1];
}
}
done = 1;
}
if ((character[i] == 44) && (done == 0)) {
/* Comma */
if (set[i - 1] == 2) {
character[i] = 48;
set[i] = 2;
} else {
if ((i != length - 1) && (set[i + 1] == 2)) {
character[i] = 48;
set[i] = 2;
} else {
set[i] = 1;
}
}
done = 1;
}
if ((character[i] == 46) && (done == 0)) {
/* Full Stop */
if (set[i - 1] == 2) {
character[i] = 49;
set[i] = 2;
} else {
if ((i != length - 1) && (set[i + 1] == 2)) {
character[i] = 49;
set[i] = 2;
} else {
set[i] = 1;
}
}
done = 1;
}
if ((character[i] == 47) && (done == 0)) {
/* Slash */
if (set[i - 1] == 2) {
character[i] = 50;
set[i] = 2;
} else {
if ((i != length - 1) && (set[i + 1] == 2)) {
character[i] = 50;
set[i] = 2;
} else {
set[i] = 1;
}
}
done = 1;
}
if ((character[i] == 58) && (done == 0)) {
/* Colon */
if (set[i - 1] == 2) {
character[i] = 51;
set[i] = 2;
} else {
if ((i != length - 1) && (set[i + 1] == 2)) {
character[i] = 51;
set[i] = 2;
} else {
set[i] = 1;
}
}
done = 1;
}
}
}
for (i = length; i < 144; i++) {
/* Add the padding */
if (set[length - 1] == 2) {
set[i] = 2;
} else {
set[i] = 1;
}
character[i] = 33;
}
/* Find candidates for number compression */
if ((mode == 2) || (mode == 3)) {
j = 0;
} else {
j = 9;
}
/* Number compression not allowed in primary message */
count = 0;
for (i = j; i < 143; i++) {
if ((set[i] == 1) && ((character[i] >= 48) && (character[i] <= 57))) {
/* Character is a number */
count++;
} else {
count = 0;
}
if (count == 9) {
/* Nine digits in a row can be compressed */
set[i] = 6;
set[i - 1] = 6;
set[i - 2] = 6;
set[i - 3] = 6;
set[i - 4] = 6;
set[i - 5] = 6;
set[i - 6] = 6;
set[i - 7] = 6;
set[i - 8] = 6;
count = 0;
}
}
/* Add shift and latch characters */
current_set = 1;
i = 0;
do {
if ((set[i] != current_set) && (set[i] != 6)) {
switch (set[i]) {
case 1:
if (set[i + 1] == 1) {
if (set[i + 2] == 1) {
if (set[i + 3] == 1) {
/* Latch A */
maxi_bump(set, character, i);
character[i] = 63;
current_set = 1;
length++;
} else {
/* 3 Shift A */
maxi_bump(set, character, i);
character[i] = 57;
length++;
i += 2;
}
} else {
/* 2 Shift A */
maxi_bump(set, character, i);
character[i] = 56;
length++;
i++;
}
} else {
/* Shift A */
maxi_bump(set, character, i);
character[i] = 59;
length++;
}
break;
case 2:
if (set[i + 1] == 2) {
/* Latch B */
maxi_bump(set, character, i);
character[i] = 63;
current_set = 2;
length++;
} else {
/* Shift B */
maxi_bump(set, character, i);
character[i] = 59;
length++;
}
break;
case 3:
/* Shift C */
maxi_bump(set, character, i);
character[i] = 60;
length++;
break;
case 4:
/* Shift D */
maxi_bump(set, character, i);
character[i] = 61;
length++;
break;
case 5:
/* Shift E */
maxi_bump(set, character, i);
character[i] = 62;
length++;
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[11];
int value;
for (j = 0; j < 9; j++) {
substring[j] = character[i + j];
}
substring[9] = '\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);
/* Insert ECI at the beginning of message if needed */
if (eci != 3) {
maxi_bump(set, character, 0);
character[0] = 27; // ECI
maxi_bump(set, character, 1);
character[1] = eci;
length += 2;
}
if (((mode == 2) || (mode == 3)) && (length > 84)) {
return ZINT_ERROR_TOO_LONG;
}
if (((mode == 4) || (mode == 6)) && (length > 93)) {
return ZINT_ERROR_TOO_LONG;
}
if ((mode == 5) && (length > 77)) {
return ZINT_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;
}
/* Format structured primary for Mode 2 */
void maxi_do_primary_2(char postcode[], int country, int service) {
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);
}
/* Format structured primary for Mode 3 */
void maxi_do_primary_3(char postcode[], int country, int service) {
int i, h;
h = strlen(postcode);
to_upper((unsigned char*) postcode);
for (i = 0; i < h; i++) {
if ((postcode[i] >= 'A') && (postcode[i] <= 'Z')) {
/* (Capital) letters shifted to Code Set A values */
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 local_source[], int length) {
int i, j, block, bit, mode, countrycode = 0, service = 0, lp = 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, "");
memset(maxi_codeword, 0, sizeof (maxi_codeword));
if (mode == -1) { /* If mode is unspecified */
lp = strlen(symbol->primary);
if (lp == 0) {
mode = 4;
} else {
mode = 2;
for (i = 0; i < 10 && i < lp; i++) {
if ((symbol->primary[i] < 48) || (symbol->primary[i] > 57)) {
mode = 3;
break;
}
}
}
}
if ((mode < 2) || (mode > 6)) { /* Only codes 2 to 6 supported */
strcpy(symbol->errtxt, "Invalid Maxicode Mode");
return ZINT_ERROR_INVALID_OPTION;
}
if ((mode == 2) || (mode == 3)) { /* Modes 2 and 3 need data in symbol->primary */
if (lp == 0) { /* Mode set manually means lp doesn't get set */
lp = strlen(symbol->primary);
}
if (lp != 15) {
strcpy(symbol->errtxt, "Invalid Primary String");
return ZINT_ERROR_INVALID_DATA;
}
for (i = 9; i < 15; i++) { /* check that country code and service are numeric */
if ((symbol->primary[i] < '0') || (symbol->primary[i] > '9')) {
strcpy(symbol->errtxt, "Invalid Primary String");
return ZINT_ERROR_INVALID_DATA;
}
}
memcpy(postcode, symbol->primary, 9);
postcode[9] = '\0';
if (mode == 2) {
for (i = 0; i < 10; i++) {
if (postcode[i] == ' ') {
postcode[i] = '\0';
}
}
} else 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, local_source, length, symbol->eci);
if (i == ZINT_ERROR_TOO_LONG) {
strcpy(symbol->errtxt, "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++) {
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) {
set_module(symbol, i, j);
}
}
}
}
/* Add orientation markings */
set_module(symbol, 0, 28); // Top right filler
set_module(symbol, 0, 29);
set_module(symbol, 9, 10); // Top left marker
set_module(symbol, 9, 11);
set_module(symbol, 10, 11);
set_module(symbol, 15, 7); // Left hand marker
set_module(symbol, 16, 8);
set_module(symbol, 16, 20); // Right hand marker
set_module(symbol, 17, 20);
set_module(symbol, 22, 10); // Bottom left marker
set_module(symbol, 23, 10);
set_module(symbol, 22, 17); // Bottom right marker
set_module(symbol, 23, 17);
symbol->width = 30;
symbol->rows = 33;
return internal_error;
}
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