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aztec.c
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/* aztec.c - Handles Aztec 2D Symbols */
/*
libzint - the open source barcode library
Copyright (C) 2009 Robin Stuart <[email protected]>
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 <string.h>
#include <stdlib.h>
#include "common.h"
#include "aztec.h"
#include "reedsol.h"
/**
* Shorten the string by one character
*/
void mapshorten(int *charmap, int *typemap, int start, int length)
{
memmove(charmap + start + 1 , charmap + start + 2, (length - 1) * sizeof(int));
memmove(typemap + start + 1 , typemap + start + 2, (length - 1) * sizeof(int));
}
/**
* Insert a character into the middle of a string at position posn
*/
void insert(char binary_string[], int posn, char newbit)
{
int end;
end = strlen(binary_string);
for(int i = end; i > posn; i--) {
binary_string[i] = binary_string[i - 1];
}
binary_string[posn] = newbit;
}
/**
* Encode input data into a binary string
*/
int aztec_text_process(uint8_t source[], const unsigned int src_len, char binary_string[], int gs1)
{
int bytes;
int curtable, newtable, lasttable, chartype, maplength, blocks, debug;
int charmap[src_len * 2], typemap[src_len * 2];
int blockmap[2][src_len];
/* Lookup input string in encoding table */
maplength = 0;
debug = 0;
for(int i = 0; i < src_len; i++) {
if(gs1 && (i == 0)) {
/* Add FNC1 to beginning of GS1 messages */
charmap[maplength] = 0;
typemap[maplength++] = PUNC;
charmap[maplength] = 400;
typemap[maplength++] = PUNC;
}
if((gs1) && (source[i] == '[')) {
/* FNC1 represented by FLG(0) */
charmap[maplength] = 0;
typemap[maplength++] = PUNC;
charmap[maplength] = 400;
typemap[maplength++] = PUNC;
} else {
if(source[i] > 127 || source[i] == 0) {
charmap[maplength] = source[i];
typemap[maplength++] = BINARY;
} else {
charmap[maplength] = AztecSymbolChar[source[i]];
typemap[maplength++] = AztecCodeSet[source[i]];
}
}
}
/* Look for double character encoding possibilities */
int i = 0;
do{
if(((charmap[i] == 300) && (charmap[i + 1] == 11)) && ((typemap[i] == PUNC) && (typemap[i + 1] == PUNC))) {
/* CR LF combination */
charmap[i] = 2;
typemap[i] = PUNC;
mapshorten(charmap, typemap, i, maplength);
maplength--;
}
if(((charmap[i] == 302) && (charmap[i + 1] == 1)) && ((typemap[i] == 24) && (typemap[i + 1] == 23))) {
/* . SP combination */
charmap[i] = 3;
typemap[i] = PUNC;
mapshorten(charmap, typemap, i, maplength);
maplength--;
}
if(((charmap[i] == 301) && (charmap[i + 1] == 1)) && ((typemap[i] == 24) && (typemap[i + 1] == 23))) {
/* , SP combination */
charmap[i] = 4;
typemap[i] = PUNC;
mapshorten(charmap, typemap, i, maplength);
maplength--;
}
if(((charmap[i] == 21) && (charmap[i + 1] == 1)) && ((typemap[i] == PUNC) && (typemap[i + 1] == 23))) {
/* : SP combination */
charmap[i] = 5;
typemap[i] = PUNC;
mapshorten(charmap, typemap, i, maplength);
maplength--;
}
i++;
}while(i < (maplength - 1));
/* look for blocks of characters which use the same table */
blocks = 1;
blockmap[0][0] = typemap[0];
blockmap[1][0] = 1;
for(int i = 1; i < maplength; i++) {
if(typemap[i] == typemap[i - 1]) {
blockmap[1][blocks - 1]++;
} else {
blocks++;
blockmap[0][blocks - 1] = typemap[i];
blockmap[1][blocks - 1] = 1;
}
}
for (int i = 1; i <= 8; i <<= 1) {
if (blockmap[0][0] & i) {
blockmap[0][0] = i;
break;
}
}
if(blocks > 1) {
/* look for adjacent blocks which can use the same table (left to right search) */
for(int i = 1; i < blocks; i++) {
if(blockmap[0][i] & blockmap[0][i - 1]) {
blockmap[0][i] = (blockmap[0][i] & blockmap[0][i - 1]);
}
}
for (int i = 1; i <= 8; i <<= 1) {
if (blockmap[0][blocks - 1] & i) {
blockmap[0][blocks - 1] = i;
break;
}
}
/* look for adjacent blocks which can use the same table (right to left search) */
for(int i = blocks - 1; i > 0; i--) {
if(blockmap[0][i] & blockmap[0][i + 1]) {
blockmap[0][i] = (blockmap[0][i] & blockmap[0][i + 1]);
}
}
/* determine the encoding table for characters which do not fit
with adjacent blocks */
for (int i = 1; i < blocks; i++) {
for (int j = 8; j; j >>= 1) {
if (blockmap[0][i] & j) {
blockmap[0][i] = j;
break;
}
}
}
/* Combine blocks of the same type */
i = 0;
do{
if(blockmap[0][i] == blockmap[0][i + 1]) {
blockmap[1][i] += blockmap[1][i + 1];
for(int j = i + 1; j < blocks; j++) {
blockmap[0][j] = blockmap[0][j + 1];
blockmap[1][j] = blockmap[1][j + 1];
}
blocks--;
} else {
i++;
}
} while (i < blocks);
}
/* Put the adjusted block data back into typemap */
int j = 0;
for(int i = 0; i < blocks; i++) {
if((blockmap[1][i] < 3) && (blockmap[0][i] != 32)) { /* Shift character(s) needed */
for(int k = 0; k < blockmap[1][i]; k++) {
typemap[j + k] = blockmap[0][i] + 64;
}
} else { /* Latch character (or byte mode) needed */
for(int k = 0; k < blockmap[1][i]; k++) {
typemap[j + k] = blockmap[0][i];
}
}
j += blockmap[1][i];
}
/* Don't shift an initial capital letter */
if(typemap[0] == 65) { typemap[0] = 1; };
/* Problem characters (those that appear in different tables with different values) can now be resolved into their tables */
for(int i = 0; i < maplength; i++) {
if((charmap[i] >= 300) && (charmap[i] < 400)) {
curtable = typemap[i];
if(curtable > 64) {
curtable -= 64;
}
switch(charmap[i]) {
case 300: /* Carriage Return */
switch(curtable) {
case PUNC: charmap[i] = 1; break;
case MIXED: charmap[i] = 14; break;
}
break;
case 301: /* Comma */
switch(curtable) {
case PUNC: charmap[i] = 17; break;
case DIGIT: charmap[i] = 12; break;
}
break;
case 302: /* Full Stop */
switch(curtable) {
case PUNC: charmap[i] = 19; break;
case DIGIT: charmap[i] = 13; break;
}
break;
}
}
}
*binary_string = '\0';
curtable = UPPER; /* start with UPPER table */
lasttable = UPPER;
for(int i = 0; i < maplength; i++) {
newtable = curtable;
if((typemap[i] != curtable) && (charmap[i] < 400)) {
/* Change table */
if(curtable == BINARY) {
/* If ending binary mode the current table is the same as when entering binary mode */
curtable = lasttable;
newtable = lasttable;
}
if(typemap[i] > 64) {
/* Shift character */
switch(typemap[i]) {
case (64 + UPPER): /* To UPPER */
switch(curtable) {
case LOWER: /* US */
concat(binary_string, hexbit[28]);
if(debug) printf("US ");
break;
case MIXED: /* UL */
concat(binary_string, hexbit[29]);
if(debug) printf("UL ");
newtable = UPPER;
break;
case PUNC: /* UL */
concat(binary_string, hexbit[31]);
if(debug) printf("UL ");
newtable = UPPER;
break;
case DIGIT: /* US */
concat(binary_string, pentbit[15]);
if(debug) printf("US ");
break;
}
break;
case (64 + LOWER): /* To LOWER */
switch(curtable) {
case UPPER: /* LL */
concat(binary_string, hexbit[28]);
if(debug) printf("LL ");
newtable = LOWER;
break;
case MIXED: /* LL */
concat(binary_string, hexbit[28]);
if(debug) printf("LL ");
newtable = LOWER;
break;
case PUNC: /* UL LL */
concat(binary_string, hexbit[31]);
if(debug) printf("UL ");
concat(binary_string, hexbit[28]);
if(debug) printf("LL ");
newtable = LOWER;
break;
case DIGIT: /* UL LL */
concat(binary_string, pentbit[14]);
if(debug) printf("UL ");
concat(binary_string, hexbit[28]);
if(debug) printf("LL ");
newtable = LOWER;
break;
}
break;
case (64 + MIXED): /* To MIXED */
switch(curtable) {
case UPPER: /* ML */
concat(binary_string, hexbit[29]);
if(debug) printf("ML ");
newtable = MIXED;
break;
case LOWER: /* ML */
concat(binary_string, hexbit[29]);
if(debug) printf("ML ");
newtable = MIXED;
break;
case PUNC: /* UL ML */
concat(binary_string, hexbit[31]);
if(debug) printf("UL ");
concat(binary_string, hexbit[29]);
if(debug) printf("ML ");
newtable = MIXED;
break;
case DIGIT: /* UL ML */
concat(binary_string, pentbit[14]);
if(debug) printf("UL ");
concat(binary_string, hexbit[29]);
if(debug) printf("ML ");
newtable = MIXED;
break;
}
break;
case (64 + PUNC): /* To PUNC */
switch(curtable) {
case UPPER: /* PS */
concat(binary_string, hexbit[0]);
if(debug) printf("PS ");
break;
case LOWER: /* PS */
concat(binary_string, hexbit[0]);
if(debug) printf("PS ");
break;
case MIXED: /* PS */
concat(binary_string, hexbit[0]);
if(debug) printf("PS ");
break;
case DIGIT: /* PS */
concat(binary_string, pentbit[0]);
if(debug) printf("PS ");
break;
}
break;
case (64 + DIGIT): /* To DIGIT */
switch(curtable) {
case UPPER: /* DL */
concat(binary_string, hexbit[30]);
if(debug) printf("DL ");
newtable = DIGIT;
break;
case LOWER: /* DL */
concat(binary_string, hexbit[30]);
if(debug) printf("DL ");
newtable = DIGIT;
break;
case MIXED: /* UL DL */
concat(binary_string, hexbit[29]);
if(debug) printf("UL ");
concat(binary_string, hexbit[30]);
if(debug) printf("DL ");
newtable = DIGIT;
break;
case PUNC: /* UL DL */
concat(binary_string, hexbit[31]);
if(debug) printf("UL ");
concat(binary_string, hexbit[30]);
if(debug) printf("DL ");
newtable = DIGIT;
break;
}
break;
}
} else {
/* Latch character */
switch(typemap[i]) {
case UPPER: /* To UPPER */
switch(curtable) {
case LOWER: /* ML UL */
concat(binary_string, hexbit[29]);
if(debug) printf("ML ");
concat(binary_string, hexbit[29]);
if(debug) printf("UL ");
newtable = UPPER;
break;
case MIXED: /* UL */
concat(binary_string, hexbit[29]);
if(debug) printf("UL ");
newtable = UPPER;
break;
case PUNC: /* UL */
concat(binary_string, hexbit[31]);
if(debug) printf("UL ");
newtable = UPPER;
break;
case DIGIT: /* UL */
concat(binary_string, pentbit[14]);
if(debug) printf("UL ");
newtable = UPPER;
break;
}
break;
case LOWER: /* To LOWER */
switch(curtable) {
case UPPER: /* LL */
concat(binary_string, hexbit[28]);
if(debug) printf("LL ");
newtable = LOWER;
break;
case MIXED: /* LL */
concat(binary_string, hexbit[28]);
if(debug) printf("LL ");
newtable = LOWER;
break;
case PUNC: /* UL LL */
concat(binary_string, hexbit[31]);
if(debug) printf("UL ");
concat(binary_string, hexbit[28]);
if(debug) printf("LL ");
newtable = LOWER;
break;
case DIGIT: /* UL LL */
concat(binary_string, pentbit[14]);
if(debug) printf("UL ");
concat(binary_string, hexbit[28]);
if(debug) printf("LL ");
newtable = LOWER;
break;
}
break;
case MIXED: /* To MIXED */
switch(curtable) {
case UPPER: /* ML */
concat(binary_string, hexbit[29]);
if(debug) printf("ML ");
newtable = MIXED;
break;
case LOWER: /* ML */
concat(binary_string, hexbit[29]);
if(debug) printf("ML ");
newtable = MIXED;
break;
case PUNC: /* UL ML */
concat(binary_string, hexbit[31]);
if(debug) printf("UL ");
concat(binary_string, hexbit[29]);
if(debug) printf("ML ");
newtable = MIXED;
break;
case DIGIT: /* UL ML */
concat(binary_string, pentbit[14]);
if(debug) printf("UL ");
concat(binary_string, hexbit[29]);
if(debug) printf("ML ");
newtable = MIXED;
break;
}
break;
case PUNC: /* To PUNC */
switch(curtable) {
case UPPER: /* ML PL */
concat(binary_string, hexbit[29]);
if(debug) printf("ML ");
concat(binary_string, hexbit[30]);
if(debug) printf("PL ");
newtable = PUNC;
break;
case LOWER: /* ML PL */
concat(binary_string, hexbit[29]);
if(debug) printf("ML ");
concat(binary_string, hexbit[30]);
if(debug) printf("PL ");
newtable = PUNC;
break;
case MIXED: /* PL */
concat(binary_string, hexbit[30]);
if(debug) printf("PL ");
newtable = PUNC;
break;
case DIGIT: /* UL ML PL */
concat(binary_string, pentbit[14]);
if(debug) printf("UL ");
concat(binary_string, hexbit[29]);
if(debug) printf("ML ");
concat(binary_string, hexbit[30]);
if(debug) printf("PL ");
newtable = PUNC;
break;
}
break;
case DIGIT: /* To DIGIT */
switch(curtable) {
case UPPER: /* DL */
concat(binary_string, hexbit[30]);
if(debug) printf("DL ");
newtable = DIGIT;
break;
case LOWER: /* DL */
concat(binary_string, hexbit[30]);
if(debug) printf("DL ");
newtable = DIGIT;
break;
case MIXED: /* UL DL */
concat(binary_string, hexbit[29]);
if(debug) printf("UL ");
concat(binary_string, hexbit[30]);
if(debug) printf("DL ");
newtable = DIGIT;
break;
case PUNC: /* UL DL */
concat(binary_string, hexbit[31]);
if(debug) printf("UL ");
concat(binary_string, hexbit[30]);
if(debug) printf("DL ");
newtable = DIGIT;
break;
}
break;
case BINARY: /* To BINARY */
lasttable = curtable;
switch(curtable) {
case UPPER: /* BS */
concat(binary_string, hexbit[31]);
if(debug) printf("BS ");
newtable = BINARY;
break;
case LOWER: /* BS */
concat(binary_string, hexbit[31]);
if(debug) printf("BS ");
newtable = BINARY;
break;
case MIXED: /* BS */
concat(binary_string, hexbit[31]);
if(debug) printf("BS ");
newtable = BINARY;
break;
case PUNC: /* UL BS */
concat(binary_string, hexbit[31]);
if(debug) printf("UL ");
concat(binary_string, hexbit[31]);
if(debug) printf("BS ");
newtable = BINARY;
break;
case DIGIT: /* UL BS */
concat(binary_string, pentbit[14]);
if(debug) printf("UL ");
concat(binary_string, hexbit[31]);
if(debug) printf("BS ");
newtable = BINARY;
break;
}
bytes = 0;
do{
bytes++;
}while(typemap[i + (bytes - 1)] == BINARY);
bytes--;
if(bytes > 2079) {
return ZERROR_TOO_LONG;
}
if(bytes > 31) { /* Put 00000 followed by 11-bit number of bytes less 31 */
int adjusted;
adjusted = bytes - 31;
concat(binary_string, "00000");
bscan(binary_string, adjusted, 0x400);
} else { /* Put 5-bit number of bytes */
bscan(binary_string, bytes, 0x10);
}
if(debug) printf("(%d bytes) ", bytes);
break;
}
}
}
/* Add data to the binary string */
curtable = newtable;
chartype = typemap[i];
if(chartype > 64) { chartype -= 64; }
switch(chartype) {
case UPPER:
case LOWER:
case MIXED:
case PUNC:
if(charmap[i] >= 400) {
concat(binary_string, tribit[charmap[i] - 400]);
if(debug) printf("FLG(%d) ",charmap[i] - 400);
} else {
concat(binary_string, hexbit[charmap[i]]);
if(!((chartype == PUNC) && (charmap[i] == 0)))
if(debug) printf("%d ",charmap[i]);
}
break;
case DIGIT:
concat(binary_string, pentbit[charmap[i]]);
if(debug) printf("%d ",charmap[i]);
break;
case BINARY:
bscan(binary_string, charmap[i], 0x80);
if (debug)
printf("%d ",charmap[i]);
break;
}
}
if(debug) printf("\n");
if(strlen(binary_string) > 14970) {
return ZERROR_TOO_LONG;
}
return 0;
}
int aztec(struct zint_symbol *symbol, uint8_t source[], int length)
{
int x, y, i, j, data_blocks, ecc_blocks, layers, total_bits;
char binary_string[20000], bit_pattern[20045], descriptor[42];
char adjusted_string[20000];
uint8_t desc_data[4], desc_ecc[6];
int err_code, ecc_level, compact, data_length, data_maxsize, codeword_size, adjusted_length;
int remainder, padbits, count, gs1, adjustment_size;
int debug = 0, reader = 0;
int comp_loop = 4;
uint8_t local_source[length + 1];
memset(binary_string,0,20000);
memset(adjusted_string,0,20000);
if(symbol->input_mode == GS1_MODE) { gs1 = 1; } else { gs1 = 0; }
if(symbol->output_options & READER_INIT) { reader = 1; comp_loop = 1; }
if((gs1 == 1) && (reader == 1)) {
strcpy(symbol->errtxt, "Cannot encode in GS1 and Reader Initialisation mode at the same time");
return ZERROR_INVALID_OPTION;
}
switch(symbol->input_mode) {
case DATA_MODE:
case GS1_MODE:
memcpy(local_source, source, length);
local_source[length] = '\0';
break;
case UNICODE_MODE:
err_code = latin1_process(symbol, source, local_source, &length);
if(err_code != 0) { return err_code; }
break;
}
err_code = aztec_text_process(local_source, length, binary_string, gs1);
if(err_code != 0) {
strcpy(symbol->errtxt, "Input too long or too many extended ASCII characters");
return err_code;
}
if(!((symbol->option_1 >= -1) && (symbol->option_1 <= 4))) {
strcpy(symbol->errtxt, "Invalid error correction level - using default instead");
err_code = ZWARN_INVALID_OPTION;
symbol->option_1 = -1;
}
ecc_level = symbol->option_1;
if((ecc_level == -1) || (ecc_level == 0)) {
ecc_level = 2;
}
data_length = strlen(binary_string);
layers = 0; /* Keep compiler happy! */
data_maxsize = 0; /* Keep compiler happy! */
adjustment_size = 0;
if(symbol->option_2 == 0) { /* The size of the symbol can be determined by Zint */
do {
/* Decide what size symbol to use - the smallest that fits the data */
compact = 0; /* 1 = Aztec Compact, 0 = Normal Aztec */
layers = 0;
switch(ecc_level) {
/* For each level of error correction work out the smallest symbol which
the data will fit in */
case 1: for(int i = 32; i > 0; i--) {
if((data_length + adjustment_size) < Aztec10DataSizes[i - 1]) {
layers = i;
compact = 0;
data_maxsize = Aztec10DataSizes[i - 1];
}
}
for(int i = comp_loop; i > 0; i--) {
if((data_length + adjustment_size) < AztecCompact10DataSizes[i - 1]) {
layers = i;
compact = 1;
data_maxsize = AztecCompact10DataSizes[i - 1];
}
}
break;
case 2: for(int i = 32; i > 0; i--) {
if((data_length + adjustment_size) < Aztec23DataSizes[i - 1]) {
layers = i;
compact = 0;
data_maxsize = Aztec23DataSizes[i - 1];
}
}
for(int i = comp_loop; i > 0; i--) {
if((data_length + adjustment_size) < AztecCompact23DataSizes[i - 1]) {
layers = i;
compact = 1;
data_maxsize = AztecCompact23DataSizes[i - 1];
}
}
break;
case 3: for(int i = 32; i > 0; i--) {
if((data_length + adjustment_size) < Aztec36DataSizes[i - 1]) {
layers = i;
compact = 0;
data_maxsize = Aztec36DataSizes[i - 1];
}
}
for(int i = comp_loop; i > 0; i--) {
if((data_length + adjustment_size) < AztecCompact36DataSizes[i - 1]) {
layers = i;
compact = 1;
data_maxsize = AztecCompact36DataSizes[i - 1];
}
}
break;
case 4: for(int i = 32; i > 0; i--) {
if((data_length + adjustment_size) < Aztec50DataSizes[i - 1]) {
layers = i;
compact = 0;
data_maxsize = Aztec50DataSizes[i - 1];
}
}
for(int i = comp_loop; i > 0; i--) {
if((data_length + adjustment_size) < AztecCompact50DataSizes[i - 1]) {
layers = i;
compact = 1;
data_maxsize = AztecCompact50DataSizes[i - 1];
}
}
break;
}
if(layers == 0) { /* Couldn't find a symbol which fits the data */
strcpy(symbol->errtxt, "Input too long (too many bits for selected ECC)");
return ZERROR_TOO_LONG;
}
/* Determine codeword bitlength - Table 3 */
codeword_size = 6; /* if (layers <= 2) */
if((layers >= 3) && (layers <= 8)) { codeword_size = 8; }
if((layers >= 9) && (layers <= 22)) { codeword_size = 10; }
if(layers >= 23) { codeword_size = 12; }
j = 0; i = 0;
do {
if((j + 1) % codeword_size == 0) {
/* Last bit of codeword */
int t, done = 0;
count = 0;
/* Discover how many '1's in current codeword */
for(t = 0; t < (codeword_size - 1); t++) {
if(binary_string[(i - (codeword_size - 1)) + t] == '1') count++;
}
if(count == (codeword_size - 1)) {
adjusted_string[j] = '0';
j++;
done = 1;
}
if(count == 0) {
adjusted_string[j] = '1';
j++;
done = 1;
}
if(done == 0) {
adjusted_string[j] = binary_string[i];
j++;
i++;
}
}
adjusted_string[j] = binary_string[i];
j++;
i++;
} while (i <= (data_length + 1));
adjusted_string[j] = '\0';
adjusted_length = strlen(adjusted_string);
adjustment_size = adjusted_length - data_length;
/* Add padding */
remainder = adjusted_length % codeword_size;
padbits = codeword_size - remainder;
if(padbits == codeword_size) { padbits = 0; }
for(int i = 0; i < padbits; i++) {
concat(adjusted_string, "1");
}
adjusted_length = strlen(adjusted_string);
count = 0;
for(int i = (adjusted_length - codeword_size); i < adjusted_length; i++) {
if(adjusted_string[i] == '1') { count++; }
}
if(count == codeword_size) { adjusted_string[adjusted_length - 1] = '0'; }
if(debug) {
printf("Codewords:\n");
for(int i = 0; i < (adjusted_length / codeword_size); i++) {
for(j = 0; j < codeword_size; j++) {
printf("%c", adjusted_string[(i * codeword_size) + j]);
}
printf("\n");
}
}
} while(adjusted_length > data_maxsize);
/* This loop will only repeat on the rare occasions when the rule about not having all 1s or all 0s
means that the binary string has had to be lengthened beyond the maximum number of bits that can
be encoded in a symbol of the selected size */
} else { /* The size of the symbol has been specified by the user */
if((reader == 1) && ((symbol->option_2 >= 2) && (symbol->option_2 <= 4))) {
symbol->option_2 = 5;
}
if((symbol->option_2 >= 1) && (symbol->option_2 <= 4)) {
compact = 1;
layers = symbol->option_2;
}
if((symbol->option_2 >= 5) && (symbol->option_2 <= 36)) {
compact = 0;
layers = symbol->option_2 - 4;
}
if((symbol->option_2 < 0) || (symbol->option_2 > 36)) {
strcpy(symbol->errtxt, "Invalid Aztec Code size");
return ZERROR_INVALID_OPTION;
}
/* Determine codeword bitlength - Table 3 */
if((layers >= 0) && (layers <= 2)) { codeword_size = 6; }
if((layers >= 3) && (layers <= 8)) { codeword_size = 8; }
if((layers >= 9) && (layers <= 22)) { codeword_size = 10; }
if(layers >= 23) { codeword_size = 12; }
j = 0; i = 0;
do {
if((j + 1) % codeword_size == 0) {
/* Last bit of codeword */
int t, done = 0;
count = 0;
/* Discover how many '1's in current codeword */
for(t = 0; t < (codeword_size - 1); t++) {
if(binary_string[(i - (codeword_size - 1)) + t] == '1') count++;
}
if(count == (codeword_size - 1)) {
adjusted_string[j] = '0';
j++;
done = 1;
}
if(count == 0) {
adjusted_string[j] = '1';
j++;
done = 1;
}
if(done == 0) {
adjusted_string[j] = binary_string[i];
j++;
i++;
}
}
adjusted_string[j] = binary_string[i];
j++;
i++;
} while (i <= (data_length + 1));
adjusted_string[j] = '\0';
adjusted_length = strlen(adjusted_string);
remainder = adjusted_length % codeword_size;
padbits = codeword_size - remainder;
if(padbits == codeword_size) { padbits = 0; }
for(int i = 0; i < padbits; i++) {
concat(adjusted_string, "1");
}
adjusted_length = strlen(adjusted_string);
count = 0;
for(int i = (adjusted_length - codeword_size); i < adjusted_length; i++) {
if(adjusted_string[i] == '1') { count++; }
}
if(count == codeword_size) { adjusted_string[adjusted_length - 1] = '0'; }
/* Check if the data actually fits into the selected symbol size */
if (compact) {
data_maxsize = codeword_size * (AztecCompactSizes[layers - 1] - 3);
} else {
data_maxsize = codeword_size * (AztecSizes[layers - 1] - 3);
}
if(adjusted_length > data_maxsize) {
strcpy(symbol->errtxt, "Data too long for specified Aztec Code symbol size");
return ZERROR_TOO_LONG;
}
if(debug) {
printf("Codewords:\n");
for(int i = 0; i < (adjusted_length / codeword_size); i++) {
for(j = 0; j < codeword_size; j++) {
printf("%c", adjusted_string[(i * codeword_size) + j]);
}
printf("\n");
}
}
}
if(reader && (layers > 22)) {
strcpy(symbol->errtxt, "Data too long for reader initialisation symbol");
return ZERROR_TOO_LONG;
}
data_blocks = adjusted_length / codeword_size;
if(compact) {
ecc_blocks = AztecCompactSizes[layers - 1] - data_blocks;
} else {
ecc_blocks = AztecSizes[layers - 1] - data_blocks;
}
if(debug) {
printf("Generating a ");
if(compact) { printf("compact"); } else { printf("full-size"); }
printf(" symbol with %d layers\n", layers);
printf("Requires ");
if(compact) { printf("%d", AztecCompactSizes[layers - 1]); } else { printf("%d", AztecSizes[layers - 1]); }
printf(" codewords of %d-bits\n", codeword_size);
printf(" (%d data words, %d ecc words)\n", data_blocks, ecc_blocks);
}
unsigned int data_part[data_blocks + 3], ecc_part[ecc_blocks + 3];
/* Copy across data into separate integers */
memset(data_part,0,(data_blocks + 2)*sizeof(int));
memset(ecc_part,0,(ecc_blocks + 2)*sizeof(int));
/* Split into codewords and calculate reed-colomon error correction codes */
switch(codeword_size) {
case 6:
for(int i = 0; i < data_blocks; i++) {
if(adjusted_string[i * codeword_size] == '1') { data_part[i] += 32; }
if(adjusted_string[(i * codeword_size) + 1] == '1') { data_part[i] += 16; }
if(adjusted_string[(i * codeword_size) + 2] == '1') { data_part[i] += 8; }
if(adjusted_string[(i * codeword_size) + 3] == '1') { data_part[i] += 4; }
if(adjusted_string[(i * codeword_size) + 4] == '1') { data_part[i] += 2; }
if(adjusted_string[(i * codeword_size) + 5] == '1') { data_part[i] += 1; }
}
rs_init_gf(0x43);
rs_init_code(ecc_blocks, 1);
rs_encode_long(data_blocks, data_part, ecc_part);
for (int i = (ecc_blocks - 1); i >= 0; i--) {
bscan(adjusted_string, ecc_part[i], 0x20);
}
rs_free();
break;
case 8:
for(int i = 0; i < data_blocks; i++) {
if(adjusted_string[i * codeword_size] == '1') { data_part[i] += 128; }
if(adjusted_string[(i * codeword_size) + 1] == '1') { data_part[i] += 64; }
if(adjusted_string[(i * codeword_size) + 2] == '1') { data_part[i] += 32; }
if(adjusted_string[(i * codeword_size) + 3] == '1') { data_part[i] += 16; }
if(adjusted_string[(i * codeword_size) + 4] == '1') { data_part[i] += 8; }
if(adjusted_string[(i * codeword_size) + 5] == '1') { data_part[i] += 4; }
if(adjusted_string[(i * codeword_size) + 6] == '1') { data_part[i] += 2; }