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iec18004.c
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iec18004.c
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// IEC 18004 (QR) encoding
// Copyright (c) 2016 Adrian Kennard Andrews & Arnold Ltd
// This software is provided under the terms of the GPL v2 or later.
// This software is provided free of charge with a full "Money back" guarantee.
// Use entirely at your own risk. We accept no liability. If you don't like that - don't use it.
//#define DEBUG
#if defined(FB)
#define LIB
#include <heaps.h>
#include "iec18004.h"
#include <reedsol.h>
#include <sys_lib.h>
#define malloc(n) HEAP_alloc(heap,n)
#define free(n) HEAP_free(heap,n)
#elif defined(ESP_PLATFORM)
#include <ctype.h>
#include <string.h>
#include "iec18004.h"
#include <reedsol.h>
typedef unsigned char ui8;
#else
typedef unsigned char ui8;
#include <stdio.h>
#include <string.h>
#include <popt.h>
#include <time.h>
#include <sys/time.h>
#include <syslog.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <stdlib.h>
#include <signal.h>
#include <sys/wait.h>
#include <unistd.h>
#include <ctype.h>
#include <err.h>
#include <axl.h>
#include "iec18004.h"
#include <reedsol.h>
#include <assert.h>
#endif
// One day, maybe, Kanji mode - needs iconv UTF-8 to Shift JIS and then coding
// Little point in micro QR as nothing much seems to read them
static char alnum[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ $%*+-./:";
static int eccbytes[40][8] = { // L, M, Q, H codewords, then L, M, Q, H blocks
{7, 10, 13, 17, 1, 1, 1, 1}, // 1
{10, 16, 22, 28, 1, 1, 1, 1}, // 2
{15, 26, 36, 44, 1, 1, 2, 2}, // 3
{20, 36, 52, 64, 1, 2, 2, 4}, // 4
{26, 48, 72, 88, 1, 2, 2 + 2, 2 + 2}, // 5
{36, 64, 96, 112, 2, 4, 4, 4}, // 6
{40, 72, 108, 130, 2, 4, 2 + 4, 4 + 1}, // 7
{48, 88, 132, 156, 2, 2 + 2, 4 + 2, 4 + 2}, // 8
{60, 110, 160, 192, 2, 3 + 2, 4 + 4, 4 + 4}, // 9
{72, 130, 192, 224, 2 + 2, 4 + 1, 6 + 2, 6 + 2}, // 10
{80, 150, 224, 264, 4, 1 + 4, 4 + 4, 3 + 8}, // 11
{96, 176, 260, 308, 2 + 2, 6 + 2, 4 + 6, 7 + 4}, // 12
{104, 198, 288, 352, 4, 8 + 1, 8 + 4, 12 + 4}, // 13
{120, 216, 320, 384, 3 + 1, 4 + 5, 11 + 5, 11 + 5}, // 14
{132, 240, 360, 432, 5 + 1, 5 + 5, 5 + 7, 11 + 7}, // 15
{144, 280, 408, 480, 5 + 1, 7 + 3, 15 + 2, 3 + 13}, // 16
{168, 308, 448, 532, 1 + 5, 10 + 1, 1 + 15, 2 + 17}, // 17
{180, 338, 504, 588, 5 + 1, 9 + 4, 17 + 1, 2 + 19}, // 18
{196, 364, 546, 650, 3 + 4, 3 + 11, 17 + 4, 9 + 16}, // 19
{224, 416, 600, 700, 3 + 5, 3 + 13, 15 + 5, 15 + 10}, // 20
{224, 442, 644, 750, 4 + 4, 17, 17 + 6, 19 + 6}, // 21
{252, 476, 690, 816, 2 + 7, 17, 7 + 16, 34}, // 22
{270, 504, 750, 900, 4 + 5, 4 + 14, 11 + 14, 16 + 14}, // 23
{300, 560, 810, 960, 6 + 4, 6 + 14, 11 + 16, 30 + 2}, // 24
{312, 588, 870, 1050, 8 + 4, 8 + 13, 7 + 22, 22 + 13}, // 25
{336, 644, 952, 1110, 10 + 2, 19 + 4, 28 + 6, 33 + 4}, // 26
{360, 700, 1020, 1200, 8 + 4, 22 + 3, 8 + 26, 12 + 28}, // 27
{390, 728, 1050, 1260, 3 + 13, 3 + 23, 4 + 31, 11 + 31}, // 28
{420, 784, 1140, 1350, 7 + 7, 21 + 7, 1 + 37, 19 + 26}, // 29
{450, 812, 1200, 1440, 5 + 10, 19 + 10, 15 + 25, 23 + 25}, // 30
{480, 868, 1290, 1530, 13 + 3, 2 + 29, 42 + 1, 23 + 28}, // 31
{510, 924, 1350, 1620, 17, 10 + 23, 10 + 35, 19 + 35}, // 32
{540, 980, 1440, 1710, 17 + 1, 14 + 21, 29 + 19, 11 + 46}, // 33
{570, 1036, 1530, 1800, 13 + 6, 14 + 23, 44 + 7, 59 + 1}, // 34
{570, 1064, 1590, 1890, 12 + 7, 12 + 26, 39 + 14, 22 + 41}, // 35
{600, 1120, 1680, 1980, 6 + 14, 6 + 34, 46 + 10, 2 + 64}, // 36
{630, 1204, 1770, 2110, 17 + 4, 29 + 14, 49 + 10, 24 + 46}, // 37
{660, 1260, 1860, 2220, 4 + 18, 13 + 32, 48 + 14, 42 + 32}, // 38
{720, 1316, 1950, 2310, 20 + 4, 40 + 7, 43 + 22, 10 + 67}, // 39
{750, 1372, 2040, 2430, 19 + 6, 18 + 31, 34 + 34, 20 + 61}, // 40
};
static unsigned int
bch (int inlen, int errlen, unsigned int poly, unsigned int in)
{
unsigned int v = in << errlen;
int n;
for (n = inlen - 1; n >= 0; n--)
if (v & (1 << (n + errlen)))
v ^= (poly << n);
return (in << errlen) | v;
}
static unsigned int
bch_format (unsigned int f)
{
return bch (5, 10, 0x537, f) ^ 0x5412;
}
static unsigned int
bch_version (unsigned int v)
{
return bch (6, 12, 0x1f25, v);
}
static int
qr_bits (int ver, char mode, int len)
{ // How many bits to encode len characters using mode
int count = 0;
switch (mode)
{
case 'N': // numeric - 10 bits for 3 characters plus 7 for 2 or 4 for 1
count += 10 * (len / 3);
if (len % 3 == 2)
count += 7;
if (len % 3 == 1)
count += 4;
count += 4 + (ver < 10 ? 10 : ver < 27 ? 12 : 14);
break;
case 'A': // Alphanumeric - 11 bits for 2 characters plus 6 for 1
count += 11 * (len / 2);
if (len % 2)
count += 6;
count += 4 + (ver < 10 ? 10 : ver < 27 ? 12 : 14);
break;
case '8': // 8 bit - 8 bits per characters
count += len * 8;
count += 4 + (ver < 10 ? 8 : 16);
break;
}
return count;
}
void
qr_mode (char *mode, unsigned char ver, unsigned int len, const char *input)
{ // Work out a mode to use
if (!len)
return;
int n;
for (n = 0; n < len; n++)
{
if (input[n] && isdigit ((int) input[n]))
mode[n] = 'N';
else if (input[n] && strchr (alnum, input[n]))
mode[n] = 'A';
else
mode[n] = '8';
}
// Now optimise - we basically consider upgrading a string of one coding to another if that is fewer bits
n = 0;
while (n < len)
{
#ifdef DEBUG
if (!n)
fprintf (stderr, "Mode: %.*s\n", len, mode);
#endif
int run,
prev = 0,
next = 0;
for (run = 0; n + run < len && mode[n + run] == mode[n]; run++);
if (n)
for (prev = 1; n - prev > 0 && mode[n - prev] == mode[n - 1]; prev++); // count previous
if (n + run < len)
for (next = 1; n + run + next < len && mode[n + run + next] == mode[n + run]; next++);
if (prev && next && mode[n - 1] < mode[n] && mode[n - 1] == mode[n + run])
{ // We are an island should we upgrade to the same as either side
if (qr_bits (ver, mode[n - 1], prev + run + next) <
qr_bits (ver, mode[n - 1], prev) + qr_bits (ver, mode[n], run) + qr_bits (ver, mode[n + run], next))
{ // yes, upgrade
while (run--)
{
mode[n] = mode[n - 1];
n++;
}
n = 0; // start again
continue;
}
}
n += run;
}
n = 0;
while (n < len)
{
#ifdef DEBUG
if (!n)
fprintf (stderr, "Mode: %.*s\n", len, mode);
#endif
int run,
prev = 0,
next = 0;
for (run = 0; n + run < len && mode[n + run] == mode[n]; run++);
if (n)
for (prev = 1; n - prev > 0 && mode[n - prev] == mode[n - 1]; prev++); // count previous
if (n + run < len)
for (next = 1; n + run + next < len && mode[n + run + next] == mode[n + run]; next++);
if (prev && mode[n - 1] < mode[n])
{ // Consider upgrading to previous
if (qr_bits (ver, mode[n - 1], prev + run) < qr_bits (ver, mode[n - 1], prev) + qr_bits (ver, mode[n], run))
{
while (run--)
{
mode[n] = mode[n - 1];
n++;
}
n = 0; // start again
continue;
}
} else if (next && mode[n + run] < mode[n])
{ // Consider upgrading to next
if (qr_bits (ver, mode[n + run], run + next) < qr_bits (ver, mode[n], run) + qr_bits (ver, mode[n + run], next))
{
while (run--)
{
mode[n] = mode[n + run + 1];
n++;
}
n = 0; // start again
continue;
}
}
n += run;
}
}
static int
getmask (int x, int y, int mask)
{ // mask pattern
switch (mask & 7)
{ // Not i=y, j=x
case 0:
return (y + x) % 2 == 0 ? 1 : 0;
case 1:
return (y % 2) == 0 ? 1 : 0;
case 2:
return (x % 3 == 0) ? 1 : 0;
case 3:
return (y + x) % 3 == 0 ? 1 : 0;
case 4:
return (y / 2 + x / 3) % 2 == 0 ? 1 : 0;
case 5:
return (y * x) % 2 + (y * x) % 3 == 0 ? 1 : 0;
case 6:
return ((y * x) % 2 + (y * x) % 3) % 2 == 0 ? 1 : 0;
case 7:
return ((y * x) % 3 + (y + x) % 2) % 2 == 0 ? 1 : 0;
}
return -1;
}
#define versize(v) ((v)*4+17)
void
qr_padding (unsigned int len, unsigned char *pad)
{ // Fill in standard padding
if (!len)
return;
pad[0] = 0;
pad[len - 1] = 0;
for (unsigned int p = 1; p < len - 1; p++)
pad[p] = (p & 1) ? 0xEC : 0x11;
}
ui8 *
qr_encode_opts (
#ifdef FB
heap_h heap,
#endif
qr_encode_t o)
{ // Return (malloced) byte array width*width wide (includes mandatory quiet zone)
static const char ecls[] = "LMQH";
int n;
if (o.modep)
*o.modep = NULL;
if (o.widthp)
*o.widthp = 0;
if (o.verp)
*o.verp = 0;
if (o.maskp)
*o.maskp = 0;
if (o.eclp)
*o.eclp = 0;
if (o.padlenp)
*o.padlenp = 0;
int ecl = 0;
if (o.ecl)
{
const char *e = strchr (ecls, toupper (o.ecl));
if (!e)
return NULL; // Invalid
ecl = e - ecls;
}
if (o.san > 16 || o.sam > 16 || o.san > o.sam || (o.sam && !o.san))
return NULL; // Silly structured append
if (o.ver > 40)
return NULL; // Silly version
if (o.fnc1 > 2)
return NULL; // Silly fnc1
if (o.mode && !*o.mode)
o.mode = NULL; // Silly
char *mode = malloc (o.len);
if (!mode)
return NULL;
if (o.mode && *o.mode) // Use provided mode (pad)
for (n = 0; n < o.len; n++)
{
mode[n] = *o.mode;
if (o.mode[1])
o.mode++; // Repeats last mode to end
}
if (!o.eci)
{ // No ECI set, lets see if we need to set UTF-8, note 5C is Yen in default ECI and 7E is special too
for (n = 0; n < o.len && !(o.data[n] & 0x80) && o.data[n] != 0x5C && o.data[n] != 0x7E; n++);
if (n < o.len)
o.eci = 26; // Assume UTF-8
}
if (o.eci == 26)
{ // UTF-8 check valid
int skip = 0;
for (n = 0; n < o.len; n++)
{
if (skip)
{
if ((o.data[n] & 0xC0) != 0x80)
break; // Expecting UTF-8 continuation
skip--;
continue;
}
if ((o.data[n] & 0xF8) == 0xF0)
skip = 3;
else if ((o.data[n] & 0xF0) == 0xE0)
skip = 2;
else if ((o.data[n] & 0xE0) == 0xC0)
skip = 1;
else if (o.data[n] & 0x80)
break; // Not sensible UTF-8
}
if (n < o.len || skip)
o.eci = 0; // Not UTF-8
}
if (o.eci == 20)
o.eci = 0; // 20 is default (JIS8 and Shift JIS)
#ifdef DEBUG
fprintf (stderr, "[%d] %.*s ver=%d ecl=%d mask=%d\n", o.len, o.len, o.data, o.ver, ecl, o.mask);
#endif
int bytes (int v)
{
int a = versize (v);
int pn = 0,
p = 0;
if (v > 1)
{
pn = (a - 17) / 28 + 2;
p = pn * pn - 3;
}
int b = 64 * 3 + 2 * (a - 16) + p * 25 - (pn > 2 ? (pn - 2) * 10 : 0);;
return (a * a - b - (v >= 7 ? 67 : 31)) / 8;
}
int bits (void)
{ // work out bit count
int count = 0,
n = 0;
if (!o.mode)
qr_mode (mode, o.ver, o.len, o.data);
if (o.san)
count += 12; // Structured append
if (o.eci > 16383)
count += 28;
else if (o.eci > 127)
count += 20;
else if (o.eci)
count += 12;
if (o.fnc1)
count += 4; // FNC1
if (o.fnc1 == 2)
count += 8; // AI
while (n < o.len)
{
char m = mode[n];
int q = 0;
while (n + q < o.len && mode[n + q] == m)
q++;
count += qr_bits (o.ver, m, q);
// validity check
switch (m)
{
case 'N': // Numeric
while (q--)
if (!o.data[n] || !isdigit ((int) o.data[n++]))
return -1; // Invalid
break;
case 'A': // Alphanumeric
while (q--)
if (!o.data[n] || !strchr (alnum, toupper (o.data[n++])))
return -1; // Invalid
break;
case '8': // 8 bit
n += q; // all valid
break;
default:
return -1; // Invalid
}
}
if (o.padlen)
count = (count + 4 + 7) / 8 * 8 + (o.padlen - 2) * 8; // Manual padding added, and 0000, even if o.pad is NULL. -2 as first/last are partial
#ifdef DEBUG
fprintf (stderr, "Ver=%d Bits=%d (%d)\n", o.ver, count, (count + 7) / 8);
#endif
return count;
}
if (!o.ver)
{ // Work out version
int count = 0;
for (o.ver = 1; o.ver <= 40; o.ver++)
{
if (!count || o.ver == 10 || o.ver == 27)
count = bits (); // bit count changes at 10 and 27
if (count < 0)
{
free (mode);
return NULL; // Not valid
}
if ((count + 7) / 8 <= bytes (o.ver) - eccbytes[o.ver - 1][ecl])
break; // found one
}
} else if (bits () < 0)
{
free (mode);
return NULL; // not valid
}
if (!o.ver || o.ver > 40)
{
free (mode);
return NULL;
}
while (versize (o.ver) + (o.noquiet ? 0 : 8) < o.minsize && o.ver < 40)
o.ver++;
if (!o.ecl && !o.padlenp && !o.padlen && !o.pad)
{ // Can we do better ECL in same size?
int count = bits ();
while (ecl < 3 && (count + 7) / 8 <= bytes (o.ver) - eccbytes[o.ver - 1][ecl + 1])
ecl++;
}
#ifdef DEBUG
fprintf (stderr, "ECL=%d Ver=%d Bytes=%d ECC=%d\n", ecl, o.ver, bytes (o.ver), eccbytes[o.ver - 1][ecl]);
fprintf (stderr, "Data: %.*s\n", o.len, o.data);
fprintf (stderr, "Mode: %.*s\n", o.len, mode);
#endif
// Encode data
int total = bytes (o.ver) - eccbytes[o.ver - 1][ecl];
ui8 *data = malloc (total);
if (!data)
return NULL;
size_t dataptr = 0;
unsigned long long v = 0;
unsigned int b = 0;
void addbits (int bits, unsigned long long value)
{ // Build up the data string
value &= ((1 << bits) - 1);
v = ((v << bits) | value);
b += bits;
while (b >= 8)
{
b -= 8;
if (dataptr < total)
data[dataptr++] = (v >> b);
}
#ifdef DEBUG
while (bits)
fputc ('0' + ((v >> --bits) & 1), stderr);
fputc (' ', stderr);
#endif
}
if (o.san)
{
addbits (4, 3); //Structured append
addbits (4, o.sam - 1);
addbits (4, o.san - 1);
addbits (8, o.parity);
}
if (o.eci)
{
addbits (4, 7); // ECI
if (o.eci > 16384)
addbits (24, 0xC00000 + o.eci);
else if (o.eci > 127)
addbits (16, 0x8000 + o.eci);
else
addbits (8, o.eci);
}
if (o.fnc1 == 1)
addbits (4, 5); // FNC1 (1st)
if (o.fnc1 == 2)
{
addbits (4, 9); // FNC1 (2nd)
addbits (8, o.ai);
}
n = 0;
while (n < o.len)
{
char m = mode[n];
int q = 0;
while (n + q < o.len && mode[n + q] == m)
q++;
switch (m)
{
case 'N': // Numeric
addbits (4, 1); // mode
addbits (o.ver < 10 ? 10 : o.ver < 27 ? 12 : 14, q); // Length
while (q >= 3)
{
addbits (10, (o.data[n] - '0') * 100 + (o.data[n + 1] - '0') * 10 + (o.data[n + 2] - '0'));
n += 3;
q -= 3;
}
if (q == 2)
{
addbits (7, (o.data[n] - '0') * 10 + (o.data[n + 1] - '0'));
n += 2;
} else if (q == 1)
addbits (4, (o.data[n++] - '0'));
break;
case 'A': // Alphanumeric
addbits (4, 2); // mode
addbits (o.ver < 10 ? 9 : o.ver < 27 ? 11 : 13, q); // Length
while (q >= 2)
{
addbits (11, (strchr (alnum, toupper (o.data[n])) - alnum) * 45 + (strchr (alnum, toupper (o.data[n + 1])) - alnum));
n += 2;
q -= 2;
}
if (q)
addbits (6, strchr (alnum, toupper (o.data[n++])) - alnum);
break;
case '8': // 8 bit
addbits (4, 4); // mode
addbits (o.ver < 10 ? 8 : 16, q); // Length
while (q--)
addbits (8, o.data[n++]);
break;
default:
free (mode);
return NULL;
}
}
if (dataptr < total)
addbits (4, 0); // terminator
unsigned int databits = dataptr * 8 + b;
unsigned int padpos = 0; // Track pad bytes used
if (b)
{ // Partial
if (o.pad && padpos < o.padlen)
addbits (8 - b, o.pad[padpos]); // pad to byte
else
addbits (8 - b, 0); // pad to byte with zero
}
padpos++; // First byte is always used for any partial padding, the actual first whole byte is offset 1
// Padding bytes
while (dataptr < total)
{
if (o.pad && padpos < o.padlen)
addbits (8, o.pad[padpos]); // Use padding byte
else
addbits (8, (padpos & 1) ? 0xEC : 0x11);
padpos++;
}
#ifdef DEBUG
for (n = 0; n < dataptr; n++)
{
fprintf (stderr, "%02X ", data[n]);
//data[n] = n;
}
fprintf (stderr, " (%02X %d)\n", n, n);
#endif
#ifndef FB
short *padmap = NULL;
ui8 *colour = NULL;
#endif
// Add ECC
{
int blocks = eccbytes[o.ver - 1][ecl + 4];
int ecctotal = eccbytes[o.ver - 1][ecl];
int eccsize = ecctotal / blocks;
if (eccsize * blocks != ecctotal)
{
free (mode);
return NULL;
}
#ifdef FB
rs_context *context =
#endif
rs_init (
#ifdef FB
heap,
#endif
0x11D, eccsize, 0);
ui8 *ecc = malloc (eccsize);
if (!ecc)
return NULL;
ui8 *final = malloc (total + ecctotal);
if (!final)
return NULL;
#ifndef FB
if (!(colour = malloc (total + ecctotal)))
return NULL;
if (o.padmap)
{
if (!(padmap = malloc (sizeof (*padmap) * total)))
return NULL;
memset (padmap, -1, sizeof (*padmap) * (total));
}
#endif
int datas = total / blocks;
int datan = blocks - (total - datas * blocks);
#ifdef DEBUG
fprintf (stderr, "ECC blocks=%d total=%d size=%d data=%d %d*%d %d*%d\n", blocks, ecctotal, eccsize, total, datas, datan,
datas + 1, blocks - datan);
#endif
int p = 0,
q = 0;
void add (int o)
{ // Add byte and set colour
final[p] = data[o];
#ifndef FB
if (o * 8 >= databits)
// Whole byte pad
colour[p] = QR_TAG_PAD;
else if (o * 8 + 7 >= databits)
colour[p] = QR_TAG_PAD + QR_TAG_DATA; // Mixed pad and data
else
colour[p] = QR_TAG_DATA; // Whole byte data
if (padmap && o < total && p < total && o >= (databits - 1) / 8)
padmap[p] = o - (databits - 1) / 8; // Map which byte of padding this relates to
#endif
p++;
}
for (q = 0; q < datas; q++)
for (n = 0; n < blocks; n++)
add (datas * n + (n > datan ? n - datan : 0) + q);
for (n = datan; n < blocks; n++)
add (datas * datan + (datas + 1) * (n - datan) + datas);
p = 0;
for (n = 0; n < blocks; n++)
{
rs_encode (
#ifdef FB
context,
#endif
datas, data + p, ecc);
for (q = 0; q < eccsize; q++)
{
int o = total + n + q * blocks;
final[o] = ecc[q];
#ifndef FB
colour[o] = QR_TAG_ECC;
#endif
}
p += datas;
if (n + 1 == datan)
datas++;
}
free (data);
free (ecc);
data = final;
dataptr = total + ecctotal;
}
#ifdef DEBUG
for (n = 0; n < dataptr; n++)
fprintf (stderr, "%02X ", data[n]);
fprintf (stderr, "\n");
#endif
int w = versize (o.ver);
int q = (o.noquiet ? 0 : 4); // Quiet
ui8 *grid = malloc ((w + q + q) * (w + q + q));
if (!grid)
return NULL;
memset (grid, 0, (w + q + q) * (w + q + q));
inline int gridxy (int x, int y)
{ // Position in grid for x/y where 0/0 is top left of actual code inside the quiet zone
assert (x >= 0 && x < w && y >= 0 && y < w);
x += q;
y += q;
switch (o.rotate)
{
case 1:
return (w + q + q) * (w + q + q - 1 - x) + y;
case 2:
return (w + q + q) * (w + q + q - 1 - y) + (w + q + q - 1 - x);
case 3:
return (w + q + q) * x + (w + q + q - 1 - y);
default:
return (w + q + q) * y + x;
}
}
inline void set (int x, int y, int v)
{
if (x >= 0 && x < w && y >= 0 && y < w)
grid[gridxy (x, y)] = (v | QR_TAG_SET);
}
inline void black (int x, int y)
{
set (x, y, 1 + QR_TAG_FIXED); // 2 is marking fixed marks
}
inline void white (int x, int y)
{
set (x, y, 0 + QR_TAG_FIXED); // 2 is marking fixed marks
}
// Corners
void target (int x, int y)
{
for (n = -1; n < 8; n++)
{
white (x + n, y - 1);
white (x + n, y + 7);
}
for (n = 0; n < 7; n++)
{
white (x - 1, y + n);
white (x + 7, y + n);
}
for (n = 0; n < 7; n++)
{
black (x + n, y + 0);
black (x + n, y + 6);
}
for (n = 1; n < 6; n++)
{
black (x + 0, y + n);
black (x + 6, y + n);
}
for (n = 1; n < 6; n++)
{
white (x + 1, y + n);
white (x + 5, y + n);
}
for (n = 2; n < 5; n++)
{
white (x + n, y + 1);
white (x + n, y + 5);
}
for (n = 2; n < 5; n++)
{
black (x + 2, y + n);
black (x + 3, y + n);
black (x + 4, y + n);
}
}
target (0, 0);
target (w - 7, 0);
target (0, w - 7);
// Timing
for (n = 8; n < w - 8; n += 2)
{
black (n, 6);
black (6, n);
}
for (n = 9; n < w - 8; n += 2)
{
white (n, 6);
white (6, n);
}
// Alignment pattern
if (o.ver > 1)
{
int pn = (w - 17) / 28 + 2;
int ps = ((w - 13) / 2 + pn - 2) / (pn - 1) * 2;
if (o.ver == 32)
ps = 26;
int x,
y;
x = 6;
while (x <= w - 7)
{
y = 6;
while (y <= w - 7)
{
if (!((x == 6 && y == 6) || (x == 6 && y == w - 7) || (x == w - 7 && y == 6)))
{
for (n = -2; n <= 2; n++)
{
black (x + n, y - 2);
black (x + n, y + 2);
}
for (n = -1; n <= 1; n++)
{
black (x - 2, y + n);
black (x + 2, y + n);
white (x - 1, y + n);
white (x + 1, y + n);
}
white (x, y - 1);
white (x, y + 1);
black (x, y);
}
if (y == 6)
y = w - 7 - (pn - 2) * ps;
else
y += ps;
}
if (x == 6)
x = w - 7 - (pn - 2) * ps;
else
x += ps;
}
}
black (8, w - 8);
void setfcode (int mask)
{ // Format info
unsigned int fcode = (((ecl ^ 1) << 3) + (mask & 7));
fcode = bch_format (fcode);
for (n = 0; n <= 5; n++)
set (8, n, (fcode & (1 << n)) ? 1 : 0);
for (n = 9; n <= 14; n++)
set (14 - n, 8, (fcode & (1 << n)) ? 1 : 0);
set (7, 8, (fcode & (1 << 8)) ? 1 : 0);
set (8, 8, (fcode & (1 << 7)) ? 1 : 0);
set (8, 7, (fcode & (1 << 6)) ? 1 : 0);
for (n = 0; n <= 7; n++)
set (w - n - 1, 8, (fcode & (1 << n)) ? 1 : 0);
for (n = 8; n <= 14; n++)
set (8, w - (14 - n) - 1, (fcode & (1 << n)) ? 1 : 0);
}
setfcode (o.mask);
// Version info
if (o.ver >= 7)
{
unsigned int vcode = bch_version (o.ver);
#ifdef DEBUG
fprintf (stderr, "Vcode=%X\n", vcode);
#endif
int x,
y;
for (x = 0; x < 6; x++)
for (y = 0; y < 3; y++)
{
set (x, w - 11 + y, (vcode & (1 << (y + x * 3))) ? 1 : 0);
set (w - 11 + y, x, (vcode & (1 << (y + x * 3))) ? 1 : 0);
}
}
// Load data (o.masked)
{
#ifndef FB
if (o.padmap)
{
if (!((*o.padmap) = malloc (sizeof (*o.padmap) * (w + q + q) * (w + q + q))))
return NULL;
memset (*o.padmap, -1, sizeof (*o.padmap) * (w + q + q) * (w + q + q));
}
#endif
int u = 1;
int b = 7;
int x = w - 1;
int y = w - 1;
n = 0;
while (x >= 0 && y >= 0)
{
if (!grid[gridxy (x, y)])
{ // Store a bit
int v = QR_TAG_PAD;
if (n < dataptr)
{
#ifndef FB
v = colour[n];
if ((v & (QR_TAG_PAD | QR_TAG_DATA)) == (QR_TAG_PAD | QR_TAG_DATA) && 7 - b < (databits & 7))
v &= ~QR_TAG_PAD; // DATA only
if (o.padmap && (v & QR_TAG_PAD) && n < total && padmap[n] >= 0)
(*o.padmap)[gridxy (x, y)] = padmap[n] * 8 + b;
#endif
v |= (data[n] & (1 << b) ? 1 : 0);
} else
{ // Final bits
if (o.pad && padpos < o.padlen)
v |= ((o.pad[padpos] & (1 << b)) ? 1 : 0);
if (o.padmap)
(*o.padmap)[gridxy (x, y)] = padpos * 8 + b;
}
set (x, y, v | QR_TAG_DATA);
b--;
if (b < 0)
{
b = 7;
if (n >= dataptr)
padpos++;
else
n++;
}
}
if ((x > 6 ? x - 1 : x) & 1)
x--;
else
{
x++;
if (u)
{
y--;
if (y < 0)
{
y = 0;
x -= 2;
if (x == 6)
x--;
u = 0;
}
} else
{
y++;
if (y >= w)
{
y = w - 1;
x -= 2;
if (x == 6)
x--;
u = 1;
}
}
}
}
if (b < 7)
padpos++; // Last byte was used as partial
}
unsigned int score (char m)
{ // Score based on mask
unsigned int score = 0;
setfcode (m);
int bit (int x, int y)
{ // What colour would a bit be based on selected mask being applied
if (x < 0 || x >= w || y < 0 || y >= w)
return 0;
int v = grid[gridxy (x, y)];
if (v & QR_TAG_DATA)
v ^= getmask (x, y, m);
return v & 1;
}
// 7.8.3.1
unsigned int n1 = 3, // runs 5 or more
n2 = 3, // blocks 2x2
n3 = 40, // 1:1:3:1:1 patterns
n4 = 10, // bad ratio
c = 0,
v;
int x,
y;
void checkbit (int b)
{ // Check pattern each way
v = (v << 1) | (b ? 1 : 0);
if ((v ^ (v >> 1)) & 1)
{ // End of a run
if (c >= 5)
score += n1 + (c - 5);
c = 0;
}
c++;
// Pattern
if ((v & 0xFFF) == 0x0BA || (v & 0xFFF) == 0x5D0)
score += n3; // ....X.XXX.X. or .X.XXX.X....
}
for (y = 0; y < w; y++)
for (x = -4; x < w + 5; x++)
checkbit (x == w + 4 || bit (x, y));
for (x = 0; x < w; x++)
for (y = -4; y < w + 5; y++)
checkbit (y == w + 4 || bit (x, y));
c = 0;
for (x = 0; x < w; x++)
for (y = 0; y < w; y++)
{
if ((v = bit (x, y)))
c++; // Count black
if (v == bit (x + 1, y) && v == bit (x, y + 1) && v == bit (x + 1, y + 1))
score += n2; // 2x2 blocks
}
c = (c * 100 / w / w); // Percent
c /= 5; // Per 5%
if (c < 10)
score += n4 * (10 - c);
else if (c > 10)
score += n4 * (c - 10);
return score;
}
{ // Masking