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zint/backend/dmatrix.c
Robin Stuart 964a178afe Data Matrix bugfix to use all of symbol 
Length of encoded data did not map correctly to symbol sizes, Zint now allows up to the maximum capacity in symbols.
Thanks to Andreas Warmer.
2010-12-19 13:55:43 +00:00

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/* dmatrix.c Handles Data Matrix ECC 200 symbols */
/*
libzint - the open source barcode library
Copyright (C) 2009 Robin Stuart <robin@zint.org.uk>
developed from and including some functions from:
IEC16022 bar code generation
Adrian Kennard, Andrews & Arnold Ltd
with help from Cliff Hones on the RS coding
(c) 2004 Adrian Kennard, Andrews & Arnold Ltd
(c) 2006 Stefan Schmidt <stefan@datenfreihafen.org>
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 <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#ifdef _MSC_VER
#include <malloc.h>
#endif
#include "reedsol.h"
#include "common.h"
#include "dmatrix.h"
// Annex M placement alorithm low level
static void ecc200placementbit(int *array, int NR, int NC, int r, int c, int p, char b)
{
if (r < 0) {
r += NR;
c += 4 - ((NR + 4) % 8);
}
if (c < 0) {
c += NC;
r += 4 - ((NC + 4) % 8);
}
array[r * NC + c] = (p << 3) + b;
}
static void ecc200placementblock(int *array, int NR, int NC, int r,
int c, int p)
{
ecc200placementbit(array, NR, NC, r - 2, c - 2, p, 7);
ecc200placementbit(array, NR, NC, r - 2, c - 1, p, 6);
ecc200placementbit(array, NR, NC, r - 1, c - 2, p, 5);
ecc200placementbit(array, NR, NC, r - 1, c - 1, p, 4);
ecc200placementbit(array, NR, NC, r - 1, c - 0, p, 3);
ecc200placementbit(array, NR, NC, r - 0, c - 2, p, 2);
ecc200placementbit(array, NR, NC, r - 0, c - 1, p, 1);
ecc200placementbit(array, NR, NC, r - 0, c - 0, p, 0);
}
static void ecc200placementcornerA(int *array, int NR, int NC, int p)
{
ecc200placementbit(array, NR, NC, NR - 1, 0, p, 7);
ecc200placementbit(array, NR, NC, NR - 1, 1, p, 6);
ecc200placementbit(array, NR, NC, NR - 1, 2, p, 5);
ecc200placementbit(array, NR, NC, 0, NC - 2, p, 4);
ecc200placementbit(array, NR, NC, 0, NC - 1, p, 3);
ecc200placementbit(array, NR, NC, 1, NC - 1, p, 2);
ecc200placementbit(array, NR, NC, 2, NC - 1, p, 1);
ecc200placementbit(array, NR, NC, 3, NC - 1, p, 0);
}
static void ecc200placementcornerB(int *array, int NR, int NC, int p)
{
ecc200placementbit(array, NR, NC, NR - 3, 0, p, 7);
ecc200placementbit(array, NR, NC, NR - 2, 0, p, 6);
ecc200placementbit(array, NR, NC, NR - 1, 0, p, 5);
ecc200placementbit(array, NR, NC, 0, NC - 4, p, 4);
ecc200placementbit(array, NR, NC, 0, NC - 3, p, 3);
ecc200placementbit(array, NR, NC, 0, NC - 2, p, 2);
ecc200placementbit(array, NR, NC, 0, NC - 1, p, 1);
ecc200placementbit(array, NR, NC, 1, NC - 1, p, 0);
}
static void ecc200placementcornerC(int *array, int NR, int NC, int p)
{
ecc200placementbit(array, NR, NC, NR - 3, 0, p, 7);
ecc200placementbit(array, NR, NC, NR - 2, 0, p, 6);
ecc200placementbit(array, NR, NC, NR - 1, 0, p, 5);
ecc200placementbit(array, NR, NC, 0, NC - 2, p, 4);
ecc200placementbit(array, NR, NC, 0, NC - 1, p, 3);
ecc200placementbit(array, NR, NC, 1, NC - 1, p, 2);
ecc200placementbit(array, NR, NC, 2, NC - 1, p, 1);
ecc200placementbit(array, NR, NC, 3, NC - 1, p, 0);
}
static void ecc200placementcornerD(int *array, int NR, int NC, int p)
{
ecc200placementbit(array, NR, NC, NR - 1, 0, p, 7);
ecc200placementbit(array, NR, NC, NR - 1, NC - 1, p, 6);
ecc200placementbit(array, NR, NC, 0, NC - 3, p, 5);
ecc200placementbit(array, NR, NC, 0, NC - 2, p, 4);
ecc200placementbit(array, NR, NC, 0, NC - 1, p, 3);
ecc200placementbit(array, NR, NC, 1, NC - 3, p, 2);
ecc200placementbit(array, NR, NC, 1, NC - 2, p, 1);
ecc200placementbit(array, NR, NC, 1, NC - 1, p, 0);
}
// Annex M placement alorithm main function
static void ecc200placement(int *array, int NR, int NC)
{
int r, c, p;
// invalidate
for (r = 0; r < NR; r++)
for (c = 0; c < NC; c++)
array[r * NC + c] = 0;
// start
p = 1;
r = 4;
c = 0;
do {
// check corner
if (r == NR && !c)
ecc200placementcornerA(array, NR, NC, p++);
if (r == NR - 2 && !c && NC % 4)
ecc200placementcornerB(array, NR, NC, p++);
if (r == NR - 2 && !c && (NC % 8) == 4)
ecc200placementcornerC(array, NR, NC, p++);
if (r == NR + 4 && c == 2 && !(NC % 8))
ecc200placementcornerD(array, NR, NC, p++);
// up/right
do {
if (r < NR && c >= 0 && !array[r * NC + c])
ecc200placementblock(array, NR, NC, r, c, p++);
r -= 2;
c += 2;
}
while (r >= 0 && c < NC);
r++;
c += 3;
// down/left
do {
if (r >= 0 && c < NC && !array[r * NC + c])
ecc200placementblock(array, NR, NC, r, c, p++);
r += 2;
c -= 2;
}
while (r < NR && c >= 0);
r += 3;
c++;
}
while (r < NR || c < NC);
// unfilled corner
if (!array[NR * NC - 1])
array[NR * NC - 1] = array[NR * NC - NC - 2] = 1;
}
// calculate and append ecc code, and if necessary interleave
static void ecc200(unsigned char *binary, int bytes, int datablock, int rsblock, int skew)
{
int blocks = (bytes + 2) / datablock, b;
int n, p;
rs_init_gf(0x12d);
rs_init_code(rsblock, 1);
for (b = 0; b < blocks; b++) {
unsigned char buf[256], ecc[256];
p = 0;
for (n = b; n < bytes; n += blocks)
buf[p++] = binary[n];
rs_encode(p, buf, ecc);
p = rsblock - 1; // comes back reversed
for (n = b; n < rsblock * blocks; n += blocks) {
if (skew) {
/* Rotate ecc data to make 144x144 size symbols acceptable */
/* See http://groups.google.com/group/postscriptbarcode/msg/5ae8fda7757477da */
if(b < 8) {
binary[bytes + n + 2] = ecc[p--];
} else {
binary[bytes + n - 8] = ecc[p--];
}
} else {
binary[bytes + n] = ecc[p--];
}
}
}
rs_free();
}
int isx12(unsigned char source)
{
if(source == 13) { return 1; }
if(source == 42) { return 1; }
if(source == 62) { return 1; }
if(source == 32) { return 1; }
if((source >= '0') && (source <= '9')) { return 1; }
if((source >= 'A') && (source <= 'Z')) { return 1; }
return 0;
}
void dminsert(char binary_string[], int posn, char newbit)
{ /* Insert a character into the middle of a string at position posn */
int i, end;
end = strlen(binary_string);
for(i = end; i > posn; i--) {
binary_string[i] = binary_string[i - 1];
}
binary_string[posn] = newbit;
}
void insert_value(unsigned char binary_stream[], int posn, int streamlen, char newbit)
{
int i;
for(i = streamlen; i > posn; i--) {
binary_stream[i] = binary_stream[i - 1];
}
binary_stream[posn] = newbit;
}
int look_ahead_test(unsigned char source[], int sourcelen, int position, int current_mode, int gs1)
{
/* A custom version of the 'look ahead test' from Annex P */
/* This version is deliberately very reluctant to end a data stream with EDIFACT encoding */
float ascii_count, c40_count, text_count, x12_count, edf_count, b256_count, best_count;
int sp, done, best_scheme;
char reduced_char;
/* step (j) */
if(current_mode == DM_ASCII) {
ascii_count = 0.0;
c40_count = 1.0;
text_count = 1.0;
x12_count = 1.0;
edf_count = 1.0;
b256_count = 1.25;
} else {
ascii_count = 1.0;
c40_count = 2.0;
text_count = 2.0;
x12_count = 2.0;
edf_count = 2.0;
b256_count = 2.25;
}
switch(current_mode) {
case DM_C40: c40_count = 0.0; break;
case DM_TEXT: text_count = 0.0; break;
case DM_X12: x12_count = 0.0; break;
case DM_EDIFACT: edf_count = 0.0; break;
case DM_BASE256: b256_count = 0.0; break;
}
for(sp = position; (sp < sourcelen) && (sp <= (position + 8)); sp++) {
if(source[sp] <= 127) { reduced_char = source[sp]; } else { reduced_char = source[sp] - 127; }
if((source[sp] >= '0') && (source[sp] <= '9')) { ascii_count += 0.5; } else { ascii_count += 1.0; }
if(source[sp] > 127) { ascii_count += 1.0; }
done = 0;
if(reduced_char == ' ') { c40_count += (2.0 / 3.0); done = 1; }
if((reduced_char >= '0') && (reduced_char <= '9')) { c40_count += (2.0 / 3.0); done = 1; }
if((reduced_char >= 'A') && (reduced_char <= 'Z')) { c40_count += (2.0 / 3.0); done = 1; }
if(source[sp] > 127) { c40_count += (4.0 / 3.0); }
if(done == 0) { c40_count += (4.0 / 3.0); }
done = 0;
if(reduced_char == ' ') { text_count += (2.0 / 3.0); done = 1; }
if((reduced_char >= '0') && (reduced_char <= '9')) { text_count += (2.0 / 3.0); done = 1; }
if((reduced_char >= 'a') && (reduced_char <= 'z')) { text_count += (2.0 / 3.0); done = 1; }
if(source[sp] > 127) { text_count += (4.0 / 3.0); }
if(done == 0) { text_count += (4.0 / 3.0); }
if(isx12(source[sp])) { x12_count += (2.0 / 3.0); } else { x12_count += 4.0; }
/* step (p) */
done = 0;
if((source[sp] >= ' ') && (source[sp] <= '^')) { edf_count += (3.0 / 4.0); } else { edf_count += 6.0; }
if(gs1 && (source[sp] == '[')) { edf_count += 6.0; }
if(sp >= (sourcelen - 5)) { edf_count += 6.0; } /* MMmmm fudge! */
/* step (q) */
if(gs1 && (source[sp] == '[')) { b256_count += 4.0; } else { b256_count += 1.0; }
/* printf("%c lat a%.2f c%.2f t%.2f x%.2f e%.2f b%.2f\n", source[sp], ascii_count, c40_count, text_count, x12_count, edf_count, b256_count); */
}
best_count = ascii_count;
best_scheme = DM_ASCII;
if(b256_count <= best_count) {
best_count = b256_count;
best_scheme = DM_BASE256;
}
if(edf_count <= best_count) {
best_count = edf_count;
best_scheme = DM_EDIFACT;
}
if(text_count <= best_count) {
best_count = text_count;
best_scheme = DM_TEXT;
}
if(x12_count <= best_count) {
best_count = x12_count;
best_scheme = DM_X12;
}
if(c40_count <= best_count) {
best_count = c40_count;
best_scheme = DM_C40;
}
return best_scheme;
}
int dm200encode(struct zint_symbol *symbol, unsigned char source[], unsigned char target[], int *last_mode, int length)
{
/* Encodes data using ASCII, C40, Text, X12, EDIFACT or Base 256 modes as appropriate */
/* Supports encoding FNC1 in supporting systems */
int sp, tp, i, gs1;
int current_mode, next_mode;
int inputlen = length;
int c40_buffer[6], c40_p;
int text_buffer[6], text_p;
int x12_buffer[6], x12_p;
int edifact_buffer[8], edifact_p;
int debug = 0;
#ifndef _MSC_VER
char binary[2 * inputlen];
#else
char* binary = (char*)_alloca(2 * inputlen);
#endif
sp = 0;
tp = 0;
memset(c40_buffer, 0, 6);
c40_p = 0;
memset(text_buffer, 0, 6);
text_p = 0;
memset(x12_buffer, 0, 6);
x12_p = 0;
memset(edifact_buffer, 0, 8);
edifact_p = 0;
strcpy(binary, "");
/* step (a) */
current_mode = DM_ASCII;
next_mode = DM_ASCII;
if(symbol->input_mode == GS1_MODE) { gs1 = 1; } else { gs1 = 0; }
if(gs1) {
target[tp] = 232; tp++;
concat(binary, " ");
if(debug) printf("FN1 ");
} /* FNC1 */
if(symbol->output_options & READER_INIT) {
if(gs1) {
strcpy(symbol->errtxt, "Cannot encode in GS1 mode and Reader Initialisation at the same time");
return ERROR_INVALID_OPTION;
} else {
target[tp] = 234; tp++; /* Reader Programming */
concat(binary, " ");
if(debug) printf("RP ");
}
}
while (sp < inputlen) {
current_mode = next_mode;
/* step (b) - ASCII encodation */
if(current_mode == DM_ASCII) {
next_mode = DM_ASCII;
if(istwodigits(source, sp) && ((sp + 1) != inputlen)) {
target[tp] = (10 * ctoi(source[sp])) + ctoi(source[sp + 1]) + 130;
if(debug) printf("N%d ", target[tp] - 130);
tp++; concat(binary, " ");
sp += 2;
} else {
next_mode = look_ahead_test(source, inputlen, sp, current_mode, gs1);
if(next_mode != DM_ASCII) {
switch(next_mode) {
case DM_C40: target[tp] = 230; tp++; concat(binary, " ");
if(debug) printf("C40 "); break;
case DM_TEXT: target[tp] = 239; tp++; concat(binary, " ");
if(debug) printf("TEX "); break;
case DM_X12: target[tp] = 238; tp++; concat(binary, " ");
if(debug) printf("X12 "); break;
case DM_EDIFACT: target[tp] = 240; tp++; concat(binary, " ");
if(debug) printf("EDI "); break;
case DM_BASE256: target[tp] = 231; tp++; concat(binary, " ");
if(debug) printf("BAS "); break;
}
} else {
if(source[sp] > 127) {
target[tp] = 235; /* FNC4 */
if(debug) printf("FN4 ");
tp++;
target[tp] = (source[sp] - 128) + 1;
if(debug) printf("A%02X ", target[tp] - 1);
tp++; concat(binary, " ");
} else {
if(gs1 && (source[sp] == '[')) {
target[tp] = 232; /* FNC1 */
if(debug) printf("FN1 ");
} else {
target[tp] = source[sp] + 1;
if(debug) printf("A%02X ", target[tp] - 1);
}
tp++;
concat(binary, " ");
}
sp++;
}
}
}
/* step (c) C40 encodation */
if(current_mode == DM_C40) {
int shift_set, value;
next_mode = DM_C40;
if(c40_p == 0) {
next_mode = look_ahead_test(source, inputlen, sp, current_mode, gs1);
}
if(next_mode != DM_C40) {
target[tp] = 254; tp++; concat(binary, " ");/* Unlatch */
next_mode = DM_ASCII;
if (debug) printf("ASC ");
} else {
if(source[sp] > 127) {
c40_buffer[c40_p] = 1; c40_p++;
c40_buffer[c40_p] = 30; c40_p++; /* Upper Shift */
shift_set = c40_shift[source[sp] - 128];
value = c40_value[source[sp] - 128];
} else {
shift_set = c40_shift[source[sp]];
value = c40_value[source[sp]];
}
if(gs1 && (source[sp] == '[')) {
shift_set = 2;
value = 27; /* FNC1 */
}
if(shift_set != 0) {
c40_buffer[c40_p] = shift_set - 1; c40_p++;
}
c40_buffer[c40_p] = value; c40_p++;
if(c40_p >= 3) {
int iv;
iv = (1600 * c40_buffer[0]) + (40 * c40_buffer[1]) + (c40_buffer[2]) + 1;
target[tp] = iv / 256; tp++;
target[tp] = iv % 256; tp++;
concat(binary, " ");
if (debug) printf("[%d %d %d] ", c40_buffer[0], c40_buffer[1], c40_buffer[2]);
c40_buffer[0] = c40_buffer[3];
c40_buffer[1] = c40_buffer[4];
c40_buffer[2] = c40_buffer[5];
c40_buffer[3] = 0;
c40_buffer[4] = 0;
c40_buffer[5] = 0;
c40_p -= 3;
}
sp++;
}
}
/* step (d) Text encodation */
if(current_mode == DM_TEXT) {
int shift_set, value;
next_mode = DM_TEXT;
if(text_p == 0) {
next_mode = look_ahead_test(source, inputlen, sp, current_mode, gs1);
}
if(next_mode != DM_TEXT) {
target[tp] = 254; tp++; concat(binary, " ");/* Unlatch */
next_mode = DM_ASCII;
if (debug) printf("ASC ");
} else {
if(source[sp] > 127) {
text_buffer[text_p] = 1; text_p++;
text_buffer[text_p] = 30; text_p++; /* Upper Shift */
shift_set = text_shift[source[sp] - 128];
value = text_value[source[sp] - 128];
} else {
shift_set = text_shift[source[sp]];
value = text_value[source[sp]];
}
if(gs1 && (source[sp] == '[')) {
shift_set = 2;
value = 27; /* FNC1 */
}
if(shift_set != 0) {
text_buffer[text_p] = shift_set - 1; text_p++;
}
text_buffer[text_p] = value; text_p++;
if(text_p >= 3) {
int iv;
iv = (1600 * text_buffer[0]) + (40 * text_buffer[1]) + (text_buffer[2]) + 1;
target[tp] = iv / 256; tp++;
target[tp] = iv % 256; tp++;
concat(binary, " ");
if (debug) printf("[%d %d %d] ", text_buffer[0], text_buffer[1], text_buffer[2]);
text_buffer[0] = text_buffer[3];
text_buffer[1] = text_buffer[4];
text_buffer[2] = text_buffer[5];
text_buffer[3] = 0;
text_buffer[4] = 0;
text_buffer[5] = 0;
text_p -= 3;
}
sp++;
}
}
/* step (e) X12 encodation */
if(current_mode == DM_X12) {
int value = 0;
next_mode = DM_X12;
if(text_p == 0) {
next_mode = look_ahead_test(source, inputlen, sp, current_mode, gs1);
}
if(next_mode != DM_X12) {
target[tp] = 254; tp++; concat(binary, " ");/* Unlatch */
next_mode = DM_ASCII;
if (debug) printf("ASC ");
} else {
if(source[sp] == 13) { value = 0; }
if(source[sp] == '*') { value = 1; }
if(source[sp] == '>') { value = 2; }
if(source[sp] == ' ') { value = 3; }
if((source[sp] >= '0') && (source[sp] <= '9')) { value = (source[sp] - '0') + 4; }
if((source[sp] >= 'A') && (source[sp] <= 'Z')) { value = (source[sp] - 'A') + 14; }
x12_buffer[x12_p] = value; x12_p++;
if(x12_p >= 3) {
int iv;
iv = (1600 * x12_buffer[0]) + (40 * x12_buffer[1]) + (x12_buffer[2]) + 1;
target[tp] = iv / 256; tp++;
target[tp] = iv % 256; tp++;
concat(binary, " ");
if (debug) printf("[%d %d %d] ", x12_buffer[0], x12_buffer[1], x12_buffer[2]);
x12_buffer[0] = x12_buffer[3];
x12_buffer[1] = x12_buffer[4];
x12_buffer[2] = x12_buffer[5];
x12_buffer[3] = 0;
x12_buffer[4] = 0;
x12_buffer[5] = 0;
x12_p -= 3;
}
sp++;
}
}
/* step (f) EDIFACT encodation */
if(current_mode == DM_EDIFACT) {
int value = 0;
next_mode = DM_EDIFACT;
if(edifact_p == 3) {
next_mode = look_ahead_test(source, inputlen, sp, current_mode, gs1);
}
if(next_mode != DM_EDIFACT) {
edifact_buffer[edifact_p] = 31; edifact_p++;
next_mode = DM_ASCII;
} else {
if((source[sp] >= '@') && (source[sp] <= '^')) { value = source[sp] - '@'; }
if((source[sp] >= ' ') && (source[sp] <= '?')) { value = source[sp]; }
edifact_buffer[edifact_p] = value; edifact_p++;
sp++;
}
if(edifact_p >= 4) {
target[tp] = (edifact_buffer[0] << 2) + ((edifact_buffer[1] & 0x30) >> 4); tp++;
target[tp] = ((edifact_buffer[1] & 0x0f) << 4) + ((edifact_buffer[2] & 0x3c) >> 2); tp++;
target[tp] = ((edifact_buffer[2] & 0x03) << 6) + edifact_buffer[3]; tp++;
concat(binary, " ");
if (debug) printf("[%d %d %d %d] ", edifact_buffer[0], edifact_buffer[1], edifact_buffer[2], edifact_buffer[3]);
edifact_buffer[0] = edifact_buffer[4];
edifact_buffer[1] = edifact_buffer[5];
edifact_buffer[2] = edifact_buffer[6];
edifact_buffer[3] = edifact_buffer[7];
edifact_buffer[4] = 0;
edifact_buffer[5] = 0;
edifact_buffer[6] = 0;
edifact_buffer[7] = 0;
edifact_p -= 4;
}
}
/* step (g) Base 256 encodation */
if(current_mode == DM_BASE256) {
next_mode = look_ahead_test(source, inputlen, sp, current_mode, gs1);
if(next_mode == DM_BASE256) {
target[tp] = source[sp];
if(debug) printf("B%02X ", target[tp]);
tp++;
sp++;
concat(binary, "b");
} else {
next_mode = DM_ASCII;
if(debug) printf("ASC ");
}
}
if(tp > 1558) {
return 0;
}
} /* while */
/* Empty buffers */
if(c40_p == 2) {
target[tp] = 254; tp++; /* unlatch */
target[tp] = source[inputlen - 2] + 1; tp++;
target[tp] = source[inputlen - 1] + 1; tp++;
concat(binary, " ");
if(debug) printf("ASC A%02X A%02X ", target[tp - 2] - 1, target[tp - 1] - 1);
current_mode = DM_ASCII;
}
if(c40_p == 1) {
target[tp] = 254; tp++; /* unlatch */
target[tp] = source[inputlen - 1] + 1; tp++;
concat(binary, " ");
if(debug) printf("ASC A%02X ", target[tp - 1] - 1);
current_mode = DM_ASCII;
}
if(text_p == 2) {
target[tp] = 254; tp++; /* unlatch */
target[tp] = source[inputlen - 2] + 1; tp++;
target[tp] = source[inputlen - 1] + 1; tp++;
concat(binary, " ");
if(debug) printf("ASC A%02X A%02X ", target[tp - 2] - 1, target[tp - 1] - 1);
current_mode = DM_ASCII;
}
if(text_p == 1) {
target[tp] = 254; tp++; /* unlatch */
target[tp] = source[inputlen - 1] + 1; tp++;
concat(binary, " ");
if(debug) printf("ASC A%02X ", target[tp - 1] - 1);
current_mode = DM_ASCII;
}
if(x12_p == 2) {
target[tp] = 254; tp++; /* unlatch */
target[tp] = source[inputlen - 2] + 1; tp++;
target[tp] = source[inputlen - 1] + 1; tp++;
concat(binary, " ");
if(debug) printf("ASC A%02X A%02X ", target[tp - 2] - 1, target[tp - 1] - 1);
current_mode = DM_ASCII;
}
if(x12_p == 1) {
target[tp] = 254; tp++; /* unlatch */
target[tp] = source[inputlen - 1] + 1; tp++;
concat(binary, " ");
if(debug) printf("ASC A%02X ", target[tp - 1] - 1);
current_mode = DM_ASCII;
}
/* Add length and randomising algorithm to b256 */
i = 0;
while (i < tp) {
if(binary[i] == 'b') {
if((i == 0) || ((i != 0) && (binary[i - 1] != 'b'))) {
/* start of binary data */
int binary_count; /* length of b256 data */
for(binary_count = 0; binary[binary_count + i] == 'b'; binary_count++);
if(binary_count <= 249) {
dminsert(binary, i, 'b');
insert_value(target, i, tp, binary_count); tp++;
} else {
dminsert(binary, i, 'b');
dminsert(binary, i + 1, 'b');
insert_value(target, i, tp, (binary_count / 250) + 249); tp++;
insert_value(target, i + 1, tp, binary_count % 250); tp++;
}
}
}
i++;
}
for(i = 0; i < tp; i++) {
if(binary[i] == 'b') {
int prn, temp;
prn = ((149 * (i + 1)) % 255) + 1;
temp = target[i] + prn;
if (temp <= 255) { target[i] = temp; } else { target[i] = temp - 256; }
}
}
if(debug) {
printf("\n\n");
for(i = 0; i < tp; i++){
printf("%02X ", target[i]);
}
printf("\n");
}
*(last_mode) = current_mode;
return tp;
}
void add_tail(unsigned char target[], int tp, int tail_length, int last_mode)
{
/* adds unlatch and pad bits */
int i, prn, temp;
switch(last_mode) {
case DM_C40:
case DM_TEXT:
case DM_X12:
target[tp] = 254; tp++; /* Unlatch */
tail_length--;
}
for(i = tail_length; i > 0; i--) {
if(i == tail_length) {
target[tp] = 129; tp++; /* Pad */
} else {
prn = ((149 * (tp + 1)) % 253) + 1;
temp = 129 + prn;
if(temp <= 254) {
target[tp] = temp; tp++;
} else {
target[tp] = temp - 254; tp++;
}
}
}
}
int data_matrix_200(struct zint_symbol *symbol, unsigned char source[], int length)
{
int inputlen, i, skew = 0;
unsigned char binary[2200];
int binlen;
int symbolsize, optionsize, calcsize;
int taillength, error_number = 0;
int H, W, FH, FW, datablock, bytes, rsblock;
int last_mode;
unsigned char *grid = 0;
inputlen = length;
binlen = dm200encode(symbol, source, binary, &last_mode, length);
if(binlen == 0) {
strcpy(symbol->errtxt, "Data too long to fit in symbol");
return ERROR_TOO_LONG;
}
if((symbol->option_2 >= 1) && (symbol->option_2 <= 30)) {
optionsize = intsymbol[symbol->option_2 - 1];
} else {
optionsize = -1;
}
calcsize = 29;
for(i = 29; i > -1; i--) {
if(matrixbytes[i] >= binlen) {
calcsize = i;
}
}
if(symbol->option_3 == DM_SQUARE) {
/* Force to use square symbol */
switch(calcsize) {
case 2:
case 4:
case 6:
case 9:
case 11:
case 14:
calcsize++;
}
}
symbolsize = optionsize;
if(calcsize > optionsize) {
symbolsize = calcsize;
if(optionsize != -1) {
/* flag an error */
error_number = WARN_INVALID_OPTION;
strcpy(symbol->errtxt, "Data does not fit in selected symbol size");
}
}
H = matrixH[symbolsize];
W = matrixW[symbolsize];
FH = matrixFH[symbolsize];
FW = matrixFW[symbolsize];
bytes = matrixbytes[symbolsize];
datablock = matrixdatablock[symbolsize];
rsblock = matrixrsblock[symbolsize];
taillength = bytes - binlen;
if(taillength != 0) {
add_tail(binary, binlen, taillength, last_mode);
}
// ecc code
if(symbolsize == 29) { skew = 1; }
ecc200(binary, bytes, datablock, rsblock, skew);
{ // placement
int x, y, NC, NR, *places;
NC = W - 2 * (W / FW);
NR = H - 2 * (H / FH);
places = (int*)malloc(NC * NR * sizeof(int));
ecc200placement(places, NR, NC);
grid = (unsigned char*)malloc(W * H);
memset(grid, 0, W * H);
for (y = 0; y < H; y += FH) {
for (x = 0; x < W; x++)
grid[y * W + x] = 1;
for (x = 0; x < W; x += 2)
grid[(y + FH - 1) * W + x] = 1;
}
for (x = 0; x < W; x += FW) {
for (y = 0; y < H; y++)
grid[y * W + x] = 1;
for (y = 0; y < H; y += 2)
grid[y * W + x + FW - 1] = 1;
}
for (y = 0; y < NR; y++) {
for (x = 0; x < NC; x++) {
int v = places[(NR - y - 1) * NC + x];
//fprintf (stderr, "%4d", v);
if (v == 1 || (v > 7 && (binary[(v >> 3) - 1] & (1 << (v & 7)))))
grid[(1 + y + 2 * (y / (FH - 2))) * W + 1 + x + 2 * (x / (FW - 2))] = 1;
}
//fprintf (stderr, "\n");
}
for(y = H - 1; y >= 0; y--) {
int x;
for(x = 0; x < W; x++) {
if(grid[W * y + x]) {
set_module(symbol, (H - y) - 1, x);
}
}
symbol->row_height[(H - y) - 1] = 1;
}
free(grid);
free(places);
}
symbol->rows = H;
symbol->width = W;
return error_number;
}
int dmatrix(struct zint_symbol *symbol, unsigned char source[], int length)
{
int error_number;
if(symbol->option_1 <= 1) {
/* ECC 200 */
error_number = data_matrix_200(symbol, source, length);
} else {
/* ECC 000 - 140 */
strcpy(symbol->errtxt, "Older Data Matrix standards are no longer supported");
error_number = ERROR_INVALID_OPTION;
}
return error_number;
}
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