commit d5f0f967f1ed43fcb4b4da6716bfd7f6e4bc00b8
Author: Colin Dean <git@cad.cx>
Date:   Wed Oct 10 13:09:23 2012 -0400

    import from http://ronja.twibright.com/optar/

diff --git a/COPYING b/COPYING
new file mode 100644
index 0000000..248ec20
--- /dev/null
+++ b/COPYING
@@ -0,0 +1,353 @@
+		    GNU GENERAL PUBLIC LICENSE
+		       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+     59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+			    Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Library General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
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+
+  For example, if you distribute copies of such a program, whether
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+
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+
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+  The precise terms and conditions for copying, distribution and
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+
+		    GNU GENERAL PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
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+
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+
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+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
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+
+	    How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
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+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    on, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USAThis 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 2 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) year  name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
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+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Library General
+Public License instead of this License.
+
+  In addition, as a special exception, the copyright holders give
+  permission to link the code of portions of this program with the
+  OpenSSL library under certain conditions as described in each
+  individual source file, and distribute linked combinations
+  including the two.
+  You must obey the GNU General Public License in all respects
+  for all of the code used other than OpenSSL.  If you modify
+  file(s) with this exception, you may extend this exception to your
+  version of the file(s), but you are not obligated to do so.  If you
+  do not wish to do so, delete this exception statement from your
+  version.  If you delete this exception statement from all source
+  files in the program, then also delete it here.
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..5c62e52
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,48 @@
+LDFLAGS=-lm
+CFLAGS=-O3 -Wall -Wuninitialized -fomit-frame-pointer -funroll-loops \
+	-fstrength-reduce -DNODEBUG `libpng-config --I_opts`
+
+all: optar unoptar
+
+install:
+	install optar /usr/local/bin/
+	install unoptar /usr/local/bin
+	install pgm2ps /usr/local/bin
+
+uninstall:
+	rm /usr/local/bin/optar
+	rm /usr/local/bin/unoptar
+	rm /usr/local/bin/pgm2ps
+
+clean:
+	rm -f optar unoptar golay golay_codes.c *.o
+
+common.o: common.c optar.h
+	gcc -c $(CPPFLAGS) $(CFLAGS) -o $@ $<
+
+parity.o: parity.c
+	gcc -c $(CPPFLAGS) $(CFLAGS) -o $@ $<
+
+optar.o: optar.c optar.h font.h parity.h
+	gcc -c $(CPPFLAGS) $(CFLAGS) -o $@ $<
+
+golay_codes.o: golay_codes.c
+	gcc -c $(CPPFLAGS) $(CFLAGS) -o $@ $<
+
+golay.o: golay.c parity.h
+	gcc -c $(CPPFLAGS) $(CFLAGS) -o $@ $<
+
+unoptar.o: unoptar.c optar.h parity.h
+	gcc -c -I/usr/local/include/libpng $(CPPFLAGS) $(CFLAGS) -o $@ $<
+
+optar: optar.o common.o golay_codes.o parity.o
+	gcc $(LDFLAGS) -o $@ $^
+
+golay_codes.c: golay
+	./$< > $@
+
+golay: golay.o parity.o
+	gcc $(LDFLAGS) -o $@ $^
+
+unoptar: unoptar.o common.o golay_codes.o parity.o
+	gcc $(LDFLAGS) -o $@ -L/usr/local/lib -lpng -lz $^
diff --git a/README b/README
new file mode 100644
index 0000000..a1ad5e3
--- /dev/null
+++ b/README
@@ -0,0 +1,113 @@
+Twibright Optar
+---------------
+
+This is a program to store data on paper using a 600dpi b/w laser printer and a
+600+ dpi scanner.
+
+You need to install ImageMagick so that the resulting .pgm image can be converted into
+PostScript with the right dimensions (so each pixel is 3x3 600dpi pixels so that
+there is no unnecessary jitter).
+
+Make sure you have libpng installed and if you type "libpng-config" on the
+commandline, there's a program which prints something.
+
+Compile with "make". Become root (su -) and type "make install". Now you have
+optar, unoptar and pgm2ps installed on your system in /usr/local/bin. Later
+you can uninstall by typing "make uninstall" the same way as you typed
+"make install".
+
+Encoding (writing)
+------------------
+Run
+
+./optar other_guys.ogg other_guys.ogg  
+
+which will produce files:
+
+other_guys.ogg_0001.pgm
+other_guys.ogg_0002.pgm
+other_guys.ogg_0003.pgm
+other_guys.ogg_0004.pgm
+other_guys.ogg_0005.pgm
+other_guys.ogg_0006.pgm
+
+Now convert them into PostScript using the included pgm2ps tool:
+./pgm2ps *.pgm
+
+Print them using a 600dpi (or more) laser printer. Inkjet or dot matrix was
+never tested and will not probably work at the pre-defined data density. See
+"Changing the format" below.
+
+Please note that the file will be padded by zeroes and the original length will
+be lost. Pack your data with tar if you store data that are sensitive to this.
+
+Decoding (reading)
+------------------
+
+Clean and polish the scanner glass with rubbing alcohol and paper towel. Put
+yellow pages on the scanner lid to get sharper picture *). Insert the
+page so that the text on the bottom is upright. Scan the pages into
+PNG (not JPEG!) on 600dpi (or 1200dpi, slightly better):
+
+scan_0001.png
+scan_0002.png
+scan_0003.png
+scan_0004.png
+scan_0005.png
+scan_0006.png
+
+Read the number sequence (format specification) from any of the papers and feed
+it as 1st argument to the optar, 2nd argument is the filename part before the
+underscore:
+
+unoptar 0-65-93-24-3-1-2-24 scan > out.ogg
+
+Then play out.ogg with mplayer. You should get first about 41 seconds from the
+Ogg Vorbis file.
+
+*) In the scanner I tried (Canoscan), the lid didn't seem to be heavy enough to
+press the paper down completely - there were blurry spots in the picture.
+Without yellow pages I got 526 reparable bad bits bad from 3.2 million. With
+yellow pages the blurry spots were much sharper and I got only 261 reparably
+bad bits!
+
+Please note the data are padded with zeroes so the original information
+about file length is lost. If your data format doesn't like this then first
+pack your data with tar.
+
+A4 <-> US Letter
+----------------
+Change the convert parameters in pgm2ps (see comments). Change XCROSSES
+and YCROSSES in optar.h (see comments). Recompile. Then you can use US Letter
+instead of A4.
+
+Changing the format
+-------------------
+If your printer is low quality and you are getting irreparable bits, you can
+try to format the media to lower capacity.  Unfortunately, setting by
+commandline is not implemented yet.  Change XCROSSES and YCROSSES in optar.h to
+lower values which yields bigger pixels and lower capacity per page, but higher
+reliability.  Make sure they are in roughly the same proportion as before,
+otherwise you get nonsquare pixels and unnecessary waste of channel capacity.
+
+You can also change the decoding parameters in unoptar.c (look for MAGIC
+CONSTANTS) in attempt to read a difficult recording: unsharp_mask,
+unsharp_dist, sync_white_cut, white_cut, minmax_filter, pixel_blur, cross_trim.
+
+Future improvement
+==================
+- manpage could be written for optar and unoptar
+- commandline help (-h) could be written for optar and unoptar
+- the format could be made configurable. Now it's stored in the optar.h
+- the magic constants could be changed by commandline options. Now they are
+  stored in unoptar.c.
+- Golay code decoding could be rewritten faster, using a sophisticated
+  algorithm (Kasami algorithm?)
+- Easy support for multiple pages per page, so it can be read by a digital
+  camera. Currently it cannot since digital camera blurs at the sides of
+  the picture.
+
+(c) GPL 2007 Karel 'Clock' Kulhavy of Twibright Labs
+See COPYING for the text of the GPL license.
+e-mail: clock (at) twibright (dot) com
+Twibright Optar homepage: http://ronja.twibright.com/optar/
diff --git a/common.c b/common.c
new file mode 100644
index 0000000..8ffb282
--- /dev/null
+++ b/common.c
@@ -0,0 +1,69 @@
+/* (c) GPL 2007 Karel 'Clock' Kulhavy, Twibright Labs */
+
+#include <stdio.h> /* fprintf */
+
+#include "optar.h"
+
+/* Coordinates don't count with the border - 0,0 is upper left corner of the
+ * first cross! */
+int is_cross(unsigned x, unsigned y)
+{
+	x%=CPITCH;
+	y%=CPITCH;
+	return (x<2*CHALF&&y<2*CHALF);
+}
+
+/* Returns the coords relative to the upperloeftmost cross upper left corner
+ * pixel! If you have borders, you have to add them! */
+void seq2xy(int *x, int *y, unsigned seq)
+{
+	unsigned rep; /* Repetition - number of narrow strip - wide strip pair,
+			 starting with 0 */
+
+	if (seq>=TOTALBITS){
+		/* Out of range */
+		*x=-1;
+		*y=-1;
+		return;
+	}
+	/* We are sure we are in range. Document structure:
+	 * - narrow strip (between top row of crosses), height is
+	 *   2*CHALF
+	 * - wide strip, height is CPITCH-2*CHALF
+	 * - the above repeats (YCROSSES-1)-times
+	 * - narrow strip 
+	 */
+	rep=seq/REPPIXELS;
+	seq=seq%REPPIXELS;
+
+	*y=REPHEIGHT*rep;
+	/* Now seq is sequence in the repetition pair */
+	if (seq>=NARROWPIXELS){
+		/* Second, wide strip of the pair */
+		*y+=NARROWHEIGHT;
+		seq-=NARROWPIXELS;
+		/* Now seq is sequence in the wide strip */
+		*y+=seq/WIDEWIDTH;
+		*x=seq%WIDEWIDTH;
+	}else{
+		/* First, narrow strip of the pair */
+		unsigned gap; /* Horizontal gap number */
+		*x=2*CHALF;
+		*y+=seq/NARROWWIDTH;
+		seq%=NARROWWIDTH;
+		/* seq is now sequence in the horiz. line */
+		gap=seq/GAPWIDTH;
+		*x+=gap*CPITCH;
+		seq%=GAPWIDTH;
+		/* seq is now sequence in the gap */
+		*x+=seq;
+	}
+}
+
+/* Golay codes */
+unsigned long golay(unsigned long in)
+{
+	return golay_codes[in&4095];
+}
+
+
diff --git a/font.h b/font.h
new file mode 100644
index 0000000..49e0b7a
--- /dev/null
+++ b/font.h
@@ -0,0 +1,2529 @@
+/*  GIMP header image file format (INDEXED): /var/www/htdocs/ronja/trunk/grx/optar/font.h  */
+
+static unsigned int width = 1500;
+static unsigned int height = 24;
+
+/*  Call this macro repeatedly.  After each use, the pixel data can be extracted  */
+
+#define HEADER_PIXEL(data,pixel) {\
+  pixel[0] = header_data_cmap[(unsigned char)data[0]][0]; \
+  pixel[1] = header_data_cmap[(unsigned char)data[0]][1]; \
+  pixel[2] = header_data_cmap[(unsigned char)data[0]][2]; \
+  data ++; }
+
+static char header_data_cmap[256][3] = {
+	{  0,  0,  0},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255},
+	{255,255,255}
+	};
+static char header_data[] = {
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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+	0,0,0,0,0,0,0,0,0,0,0,0
+	};
diff --git a/golay.c b/golay.c
new file mode 100644
index 0000000..382e36a
--- /dev/null
+++ b/golay.c
@@ -0,0 +1,64 @@
+/* (c) GPL 2007 Karel 'Clock' Kulhavy, Twibright Labs */
+
+#include <stdio.h>
+#include <assert.h>
+
+#include "parity.h"
+
+int dodecahedron[12][5]={
+	/* For each dodecahedron face (number in the comment, 1-12) there
+	 * is a list of the 5 adjacent faces (1-12). See golay.svg for
+	 * a drawing. */
+	{/*  1 */   2,  3,  4,  5,  6},
+	{/*  2 */   1,  3,  6,  7,  8},
+	{/*  3 */   1,  2,  4,  8,  9},
+	{/*  4 */   1,  3,  5,  9, 10},
+	{/*  5 */   1,  4,  6, 10, 11},
+	{/*  6 */   1,  2,  5,  7, 11},
+	{/*  7 */   2,  6,  8, 11, 12},
+	{/*  8 */   2,  3,  7,  9, 12},
+	{/*  9 */   3,  4,  8, 10, 12},
+	{/* 10 */   4,  5,  9, 11, 12},
+	{/* 11 */   5,  6,  7, 10, 12},
+	{/* 12 */   7,  8,  9, 10, 11}
+};
+
+unsigned parities[12];
+
+int main(int argc, char ** argv)
+{
+	unsigned mask, p, f;
+	unsigned input;
+	unsigned prty; /* parity */
+
+	for (p=0;p<12;p++){
+		mask=0xfff; /* All dodecahedron faces */
+		for (f=0;f<5;f++)
+			mask^=1U<<(dodecahedron[p][f]-1);
+		parities[p]=mask;
+	}
+
+	printf("unsigned long golay_codes[4096]={\n");
+
+	for (input=0;input<4096;input++){
+		unsigned n_ones;
+		unsigned long codeword;
+
+		prty=0;
+		for (p=0;p<12;p++){
+			prty<<=1;
+			prty|=parity(input&parities[p]);
+		}
+		codeword=((unsigned long)input<<12)|prty;
+		n_ones=ones(codeword);
+		printf((input==4095?"0x%06lx\n":"0x%06lx,\n"),codeword);
+		assert(n_ones==0
+			||n_ones==8
+			||n_ones==12
+			||n_ones==16
+			||n_ones==24);
+	}
+
+	printf("};\n");
+	return 0;
+}
diff --git a/golay.svg b/golay.svg
new file mode 100644
index 0000000..87a70d1
--- /dev/null
+++ b/golay.svg
@@ -0,0 +1,1298 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 20010904//EN"
+"http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
+<!-- Created with Sodipodi ("http://www.sodipodi.com/") -->
+<svg
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:xlink="http://www.w3.org/1999/xlink"
+   version="1.0"
+   width="210mm"
+   height="297mm"
+   id="svg3303"
+   sodipodi:version="0.34"
+   sodipodi:docname="drawings/golay.svg"
+   sodipodi:docbase="drawings/">
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+     id="base" />
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+  <text
+     style="fill:black;stroke:none;font-family:Bitstream Vera Sans;font-style:normal;font-weight:normal;font-size:40;text-anchor:start;writing-mode:lr;fill-opacity:1;stroke-opacity:1;stroke-width:1pt;stroke-linejoin:miter;stroke-linecap:butt;"
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diff --git a/optar.c b/optar.c
new file mode 100644
index 0000000..b7739ad
--- /dev/null
+++ b/optar.c
@@ -0,0 +1,323 @@
+/* (c) GPL 2007 Karel 'Clock' Kulhavy, Twibright Labs */
+
+#include <stdio.h> /* getchar */
+#include <stdlib.h> /* exit */
+#include <string.h> /* memcpy */
+#include <assert.h> /* assert */
+
+#define width font_width
+#define height font_height
+#include "font.h"
+#undef width
+#undef height
+
+#include "optar.h"
+#include "parity.h"
+#define HEIGHT (2*BORDER+DATA_HEIGHT+TEXT_HEIGHT)
+#define TEXT_HEIGHT 24
+
+static unsigned char ary[WIDTH*HEIGHT];
+static unsigned char *file_label=(unsigned char *)""; /* The filename written in the
+					file_label */
+static char *output_filename; /* The output filename */
+static unsigned output_filename_buffer_size;
+static unsigned char *base=(unsigned char *)"optar_out"; /* Output filename base */
+static unsigned file_number;
+FILE *output_stream;
+FILE *input_stream;
+unsigned n_pages; /* Number of pages calculated from the file length */
+
+void dump_ary(void)
+{
+	fprintf(output_stream,
+		"P5\n"
+		"%u %u\n"
+		"255\n"
+		,WIDTH, HEIGHT);
+
+	fwrite(ary, sizeof(ary), 1, output_stream);
+}
+
+/* Only the LSB is significant. Writes hamming-encoded bits. The sequence number
+ * must not be out of range! */
+void write_channelbit(unsigned char bit, unsigned long seq)
+{
+	int x,y; /* Positions of the pixel */
+
+	bit&=1;
+	bit=-bit;
+	bit=~bit; /* White=bit 0, black=bit 1 */
+	seq2xy(&x, &y, seq); /* Returns without borders! */
+	x+=BORDER;
+	y+=BORDER;
+	ary[x+y*WIDTH]=bit;
+	seq++;
+}
+
+/* Groups into two groups of bits, 0...bit-1 and bit..., and then makes
+ * a gap with zero between them by shifting the higer bits up. */
+unsigned long split(unsigned long in, unsigned bit)
+{
+	unsigned long high;
+
+	high=in;
+	in&=(1UL<<bit)-1;
+	high^=in;
+	return (high<<1)|in;
+}
+
+/* Thie bits are always stored in the LSB side of the register. Only the
+ * lowest FEC_SMALLBITS are taken into account on input. */
+unsigned long hamming(unsigned long in)
+{
+	in&=(1UL<<FEC_SMALLBITS)-1;
+
+	in<<=3; /* Split 0,1,2 */
+#if FEC_ORDER>=3
+	in=split(in,4);
+#if FEC_ORDER>=4
+	in=split(in,8);
+#if FEC_ORDER>=5
+	in=split(in,16);
+	in|=parity(in&0xffff0000)<<16;
+#endif
+	in|=parity(in&0xff00ff00)<<8;
+#endif
+	in|=parity(in&0xf0f0f0f0)<<4;
+#endif
+	in|=parity(in&0xcccccccc)<<2;
+	in|=parity(in&0xaaaaaaaa)<<1;
+	in|=parity(in);
+	return in;
+}
+
+void border(void)
+{
+	unsigned c;
+	char *ptr=(char *)(void *)ary;
+
+	memset(ptr,0,BORDER*WIDTH);
+	ptr+=BORDER*WIDTH;
+	for (c=DATA_HEIGHT;c;c--){
+		memset(ptr,0,BORDER);
+		ptr+=WIDTH;
+		memset(ptr-BORDER,0,BORDER);
+	}
+	memset(ptr,0,TEXT_HEIGHT*WIDTH);
+	ptr+=TEXT_HEIGHT*WIDTH;
+	/* BORDER bytes into the bottom border */
+	memset(ptr,0,BORDER*WIDTH);
+}
+
+void cross(x,y)
+{
+	unsigned char *ptr=ary+y*WIDTH+x;
+	unsigned c;
+
+	for (c=CHALF;c;c--,ptr+=WIDTH){
+		memset(ptr,0,CHALF);
+		memset(ptr+CHALF,0xff,CHALF);
+		memset(ptr+CHALF*WIDTH,0xff,CHALF);
+		memset(ptr+CHALF*(WIDTH+1),0,CHALF);
+	}
+}
+
+void crosses(void)
+{
+	unsigned x,y;
+
+	for (y=BORDER;y<=HEIGHT-TEXT_HEIGHT-BORDER-2*CHALF;y+=CPITCH)
+		for (x=BORDER;x<=WIDTH-BORDER-2*CHALF;x+=CPITCH)
+			cross(x,y);
+}
+
+/* x is in the range 0 to DATA_WIDTH-1 */
+void text_block (destx, srcx, width)
+{
+	int x, y;
+	unsigned char *srcptr;
+	unsigned char *destptr;
+
+	if (destx+width>DATA_WIDTH) return; /* Letter doesn't fit */
+
+	srcptr=(unsigned char *)(void *)header_data+srcx;
+	destptr=ary+WIDTH*(BORDER+DATA_HEIGHT)+BORDER+destx;
+
+	for (y=0;y<TEXT_HEIGHT;y++, srcptr+=font_width, destptr+=WIDTH){
+		for (x=0;x<width;x++){
+			destptr[x]=header_data_cmap[srcptr[x]][0]&0x80?0xff:0;
+		}
+	}
+}
+
+void label(void)
+{
+	unsigned x=0;
+	static char txt[DATA_WIDTH/TEXT_WIDTH];
+	unsigned char *ptr;
+	unsigned txtlen;
+
+	snprintf(txt, sizeof txt, "  0-%u-%u-%u-%u-%u-%u-%u %u/%u %s"
+		, XCROSSES, YCROSSES, CPITCH, CHALF
+		, FEC_ORDER, BORDER, TEXT_HEIGHT
+		,file_number,n_pages
+		, (char *)(void *)file_label);
+	txtlen=strlen((char *)(void *)txt);
+
+	assert(font_height==TEXT_HEIGHT);
+	x=font_width-TEXT_WIDTH*(127-' ');
+	text_block(0,TEXT_WIDTH*(127-' '), x);
+	for (ptr=(unsigned char *)(void *)txt
+			;ptr<(unsigned char *)(void *)txt+txtlen;ptr++){
+		if (*ptr>=' '&&*ptr<=127){
+			text_block(x,TEXT_WIDTH*(*ptr-' '), TEXT_WIDTH);
+			x+=TEXT_WIDTH;
+		}
+	}
+
+}
+
+void format_ary(void)
+{
+	memset(ary, 0xff, sizeof(ary)); /* White */
+	border();
+	crosses();
+	label();
+
+}
+
+/* Always formats ary. Dumps it if it's not the first one. */
+void new_file(void)
+{
+	if (file_number){
+		dump_ary();
+		fclose(output_stream);
+	}
+	if (file_number>=9999){
+		fprintf(stderr,"optar: too many pages - 10,000 or more\n");
+		exit(1);
+	}
+	snprintf(output_filename,output_filename_buffer_size
+		,"%s_%04u.pgm",(char *)(void *)base,++file_number);
+	output_stream=fopen(output_filename,"w");
+	if (!output_stream){
+		fprintf(stderr,"optar: cannot open %s for writing.\n", output_filename);
+		exit(1);
+	}
+	format_ary();
+}
+
+/* That's the net channel capacity */
+void write_payloadbit(unsigned char bit)
+{
+	static unsigned long accu=1;
+	static unsigned long hamming_symbol;
+
+	accu<<=1;
+	accu|=bit&1;
+	if (accu&(1UL<<FEC_SMALLBITS)){
+		/* Full payload */
+		int shift;
+
+		/* Expands from FEC_SMALLBITS bits to FEC_LARGEBITS */
+#if FEC_ORDER == 1
+		accu=golay(accu);
+#else
+		accu=hamming(accu);
+#endif /* FEC_ORDER */
+
+		if (hamming_symbol>=FEC_SYMS){
+			/* We couldn't write into the page, we need to make
+			 * another one */
+			new_file();
+			hamming_symbol=0;
+		}
+
+		/* Write the symbol into the page */
+		for (shift=FEC_LARGEBITS-1;shift>=0;shift--)
+			write_channelbit(accu>>shift
+				, hamming_symbol+(FEC_LARGEBITS-1-shift)
+				*FEC_SYMS);
+		accu=1;
+		hamming_symbol++;
+	}
+}
+
+void write_byte(unsigned char c)
+{
+	int bit;
+
+	for (bit=7; bit>=0;bit--)
+		write_payloadbit(c>>bit);
+}
+
+/* Prints the text at the bottom */
+/* Makes one output file. */
+void feed_data(void)
+{
+	int c;
+
+	while((c=fgetc(input_stream))!=EOF){
+		write_byte(c);
+	}
+
+	/* Flush the FEC with zeroes */
+	for (c=FEC_SMALLBITS-1;c;c--){
+		write_payloadbit(0);
+	}
+
+	dump_ary();
+	fclose(output_stream);
+
+}
+
+void open_input_file(char *fname)
+{
+	input_stream=fopen(fname,"r");
+	if (!input_stream){
+		fprintf(stderr,"optar: cannot open input file %s: "
+			,fname);
+		perror("");
+		exit(1);
+	}
+	if (fseek(input_stream, 0, SEEK_END)){
+		fprintf(stderr,"optar: cannot seek to the end of %s: "
+			,fname);
+		perror("");
+		exit(1);
+	}
+	n_pages=(((unsigned long)ftell(input_stream)<<3)+NETBITS-1)
+		/NETBITS;
+	if (fseek(input_stream,0, SEEK_SET)){
+		fprintf(stderr,"optar: cannot seek to the beginning of %s: "
+			,fname);
+		perror("");
+		exit(1);
+	}
+}
+
+/* argv format:
+ * 1st arg - input file
+ * 2nd arg(optional) - label and output filename base */
+int main(int argc, char **argv)
+{
+
+	if (argc<2){
+		fprintf(stderr,"Usage: optar <input file> [filename base]\n");
+		exit(1);
+	}
+	open_input_file(argv[1]);
+
+	if (argc>=3) file_label=base=(void *)argv[2];
+	output_filename_buffer_size=strlen((char *)(void *)base)+1+4+1+3+1;
+	output_filename=malloc(output_filename_buffer_size);
+	if (!output_filename){
+		fprintf(stderr,"Cannot allocate output filename\n");
+		exit(1);
+	}
+	new_file();
+	feed_data();
+	fclose(input_stream);
+	free(output_filename);
+	return 0;
+}
diff --git a/optar.h b/optar.h
new file mode 100644
index 0000000..b525405
--- /dev/null
+++ b/optar.h
@@ -0,0 +1,77 @@
+/* (c) GPL 2007 Karel 'Clock' Kulhavy, Twibright Labs */
+
+#define MIN(x,y) ((x)<(y)?(x):(y))
+#define MAX(x,y) ((x)>(y)?(x):(y))
+
+#define BORDER 2 /* In pixels. Thickness of the border */
+#define CHALF 3 /* Size of the cross half. Size of the cross is CHALF*2 x CHALF*2.
+		   */
+#define CPITCH 24 /* Distance between cross centers */
+
+/* XCROSSES A4 65, US Letter 67. */
+#define XCROSSES 65 /* Number of crosses horizontally */
+/* YCROSSES A4 93, US Letter 87. */
+#define YCROSSES 93 /* Number of crosses vertically */
+
+#define DATA_WIDTH (CPITCH*(XCROSSES-1)+2*CHALF) /* The rectangle occupied by
+						    the data and crosses */
+#define DATA_HEIGHT (CPITCH*(YCROSSES-1)+2*CHALF)
+#define WIDTH (2*BORDER+DATA_WIDTH) /* In pixels, including the border */
+/* In pixels, including the border and the label */
+
+#define TEXT_WIDTH 13 /* Width of a single letter */
+
+/* Definitions for seq2xy */
+
+/* Properties of the narrow horizontal strip, with crosses */
+#define NARROWHEIGHT (2*CHALF)
+#define GAPWIDTH (CPITCH-2*CHALF)
+#define NARROWWIDTH (GAPWIDTH*(XCROSSES-1)) /* Useful width */
+#define NARROWPIXELS (NARROWHEIGHT*NARROWWIDTH) /* Useful pixels */
+
+/* Properties of the wide horizontal strip, without crosses */
+#define WIDEHEIGHT GAPWIDTH
+#define WIDEWIDTH (WIDTH-2*BORDER)
+#define WIDEPIXELS (WIDEHEIGHT*WIDEWIDTH)
+
+/* Amount of raw payload pixels in one narrow-wide strip pair */
+#define REPHEIGHT (NARROWHEIGHT+WIDEHEIGHT)
+#define REPPIXELS (WIDEPIXELS+NARROWPIXELS)
+
+/* Total bits before hamming including the unused */
+#define TOTALBITS ((long)REPPIXELS*(YCROSSES-1)+NARROWPIXELS)
+
+/* Hamming codes with parity */
+#define FEC_ORDER 1 /* Can be 2 to 5 inclusive. 
+			   5 is 26/32,
+			   4 is 11/16,
+			   3 is 4/8,
+			   2 is 4/1
+			   1 is golay codes */
+#if FEC_ORDER==1
+/* Golay */
+#define FEC_LARGEBITS 24
+#define FEC_SMALLBITS 12
+#else
+/* Hamming */
+#define FEC_LARGEBITS (1<<FEC_ORDER)
+#define FEC_SMALLBITS (FEC_LARGEBITS-1-FEC_ORDER)
+#endif
+
+/* Hamming net channel capacity */
+#define FEC_SYMS (TOTALBITS/FEC_LARGEBITS)
+#define NETBITS (FEC_SYMS*FEC_SMALLBITS) /* Net payload bits */
+#define USEDBITS (FEC_SYMS*FEC_LARGEBITS) /* Used raw bits to store
+						     Hamming symbols */
+
+/* Functions from common.c */
+extern unsigned long parity(unsigned long in);
+extern int is_cross(unsigned x, unsigned y);
+extern void seq2xy(int *x, int *y, unsigned seq);
+
+/* Counts number of '1' bits */
+unsigned ones(unsigned long in);
+
+/* Golay codes */
+unsigned long golay(unsigned long in);
+extern unsigned long golay_codes[4096];
diff --git a/parity.c b/parity.c
new file mode 100644
index 0000000..9be76ad
--- /dev/null
+++ b/parity.c
@@ -0,0 +1,26 @@
+/* (c) GPL 2007 Karel 'Clock' Kulhavy, Twibright Labs */
+
+unsigned long parity(unsigned long in)
+{
+	in^=in>>16;
+	in^=in>>8;
+	in^=in>>4;
+	in^=in>>2;
+	in^=in>>1;
+	return in&1;
+}
+
+/* Counts number of '1' bits */
+unsigned ones(unsigned long in)
+{
+	in-=((in>>1)&0x55555555UL); /* 2-bit groups result with max. 10 */
+	in=(in&0x33333333UL)+((in&0xccccccccUL)>>2); /* 4-bit groups with 
+							max. 100 */
+	in+=in>>4;
+	in&=0x0f0f0f0fUL; /* 8-bit groups with max. 1000 */
+	in+=in>>8;
+	in+=in>>16;
+	return in&0x3f;
+}
+
+
diff --git a/parity.h b/parity.h
new file mode 100644
index 0000000..a8ce577
--- /dev/null
+++ b/parity.h
@@ -0,0 +1,7 @@
+/* (c) GPL 2007 Karel 'Clock' Kulhavy, Twibright Labs */
+
+extern unsigned long parity(unsigned long in);
+
+/* Counts number of '1' bits */
+extern unsigned ones(unsigned long in);
+
diff --git a/pgm2ps b/pgm2ps
new file mode 100644
index 0000000..50497ef
--- /dev/null
+++ b/pgm2ps
@@ -0,0 +1,17 @@
+#!/bin/sh
+while [ $# -gt 0 ]; do
+	target=`echo "$1" | sed -e 's/\.pgm$/.ps/'`
+	echo Converting "$1" to "$target"
+# We assume roughly 0.25 inch border (18) on each side.
+# A4 is 595.27559 x 841.889763 (595 x 842)
+# Letter is 8.5x11 inches or 612x792. 
+
+# Change to  556.56x807.12+19.22+17.44 for A4 and
+#	     573.84x755.28+19.08+18.36 for US Letter.
+#            Don't forget to change XCROSSES and YCROSSES in optar.h and
+#            recompile.
+	convert -page 556.56x807.12+19.22+17.44 "$1" "$target"
+#	convert -page 573.84x755.28+19.08+18.36 "$1" "$target"
+	shift
+done
+
diff --git a/unoptar.c b/unoptar.c
new file mode 100644
index 0000000..5cd6e76
--- /dev/null
+++ b/unoptar.c
@@ -0,0 +1,1696 @@
+/* (c) GPL 2007 Karel 'Clock' Kulhavy, Twibright Labs */
+
+#include <stdio.h> /* printf */
+#include <stdlib.h> /* malloc */
+#include <math.h> /* floor */
+#include <string.h> /* memcpy */
+#include <assert.h> /* assert */
+#include <png.h> /* libpng. Sometimes is in /usr/local/include/libpng/png.h, but that is taken
+		    care of using -I/usr/local/include/libpng in the Makefile. */
+
+#include "optar.h"
+#include "parity.h"
+
+/* Crosses will be resynced with precision of FINESTEP pixels */
+#define FINE_CROSS_RESYNC
+#define FINESTEP 0.25
+/* Define to disable repairing bit by Hamming codes */
+
+#define MIN(x,y) ((x)<(y)?(x):(y))
+
+/* Takes only unsigned integers, returns real value, if out of range returns
+ * white, doens't threshold*/
+#define getpixu(x,y) \
+((x)>=width||(y)>=height?0xff:ary[(x)+(y)*width])
+
+/* Integers in corners */
+#define writepix(x,y,c) writepixu((unsigned)floor(x),(unsigned)floor(y),c)
+/* If out of range, doesn't write anythinig. Integers are in pixel upper
+ * left corners. */
+#define writepixu(x,y,c) {if ((x)<width&&(y)<height) \
+	newary[(x)+(y)*width]=c;}
+
+struct que{
+	unsigned x;
+	unsigned y;
+};
+
+static unsigned width, height; /* In pixels, not it symbols! The whole image including
+			   border, white surrounding etc. */
+static unsigned char *ary; /* Allocated to width*height */
+static unsigned char *newary; /* Allocated to width*height */
+
+static unsigned long histogram[256];
+static unsigned char global_cutlevel;
+static unsigned char fill_global_cutlevel; /* This is always set to 50% between
+					      black and white to make sure the
+					      border is not accidentally broken
+					      through as happened when
+					      global_cutlevel was used for
+					      filling. */
+static unsigned char average; /* Average pixel value */
+static unsigned long corners[4][2]; /* UL, UR, LL, LR / x, y. Integers in pixel upper
+			   left corners. */
+static unsigned long leftedge, rightedge, topedge, bottomedge; /* Coordinates,
+	minima/maxima of the corner coordinates. */
+static double crosses[XCROSSES][YCROSSES][2]; /* [x][y][coord]. Integers in pixel
+					  upper left corners. */
+static float cutlevels[XCROSSES][YCROSSES]; /* Each cross has it's own cutlevel
+	based on how it came out printed. */
+static int chalf_fine; /* Larger chalf for fine search */
+static int chalf; /* In the input image, measured in input image pixels!
+		   Important difference - in the decoding, the crosses are
+		   assumed twice as small!
+
+		   Calculated by find_corners. */
+static float *search_area; /* Allocated as soon as chalf is known. Width 4*chalf+1,
+		       height 4*chalf+1. The additional "+1" is for a row
+		       (topmost) and column (leftmost) of zeroes which are
+		       a result of integration.
+
+		       Before integration, position x,y (1...4*chalf) says
+		       pixel value, where the middle of the cross is
+		       just at the boundary between pixels [2*chalf] and
+		       [2*chalf+1].
+		       After integration, each pixel says integral including
+		       that pixel. */
+
+static unsigned long bad_01, bad_10; /* Flipped from 0 to 1 (black dirt),
+					flipped from 1 to 0 (white dirt) */
+static unsigned long bad_total;
+static unsigned long irreparable;
+
+/* These macros shift coordinates by given amount of input pixels parallel
+ * with recording axes. */
+#define PSHIFTX(x, dx, dy) ((x)+(dx)*pixelhx+(dy)*pixelvx)
+#define PSHIFTY(y, dx, dy) ((y)+(dx)*pixelhy+(dy)*pixelvy)
+
+static double pixelhx, pixelhy, pixelvx, pixelvy; /* Horizontal (right) and vertical
+(down) pixel vectors.They are initialized as soon as the corners are determined
+and their length is equal to 1.  Used to compensate out rotation. System:
++x right, +y down */
+static double hpixel, vpixel; /* Pixel size calculated from the horizontal
+			 and vertical corner distance */
+static struct que *que;
+static struct que *que_end; /* First invalid */
+static struct que *rptr, *wptr;
+static FILE *input_stream;
+static double output_gamma=0.454545; /* What gamma the debug output has
+			      (output number=number of photons ^ gamma) */
+static long format_height; /* Used to be the HEIGHT macro. */
+static unsigned text_height=24;
+static unsigned long golay_stats[5]; /* 0, 1, 2, 3, 4 damaged bits */
+
+/* -------------------- MAGIC CONSTANTS -------------------- */
+static double unsharp_mask=7 /* 0.7 */; 
+static double unsharp_dist=1; /* 1 means that the neighbouring pixels will be
+				 sampled.  0.5 that halfway to the neighbouring
+				 pixels will be sampled etc. Only values up to
+				 1.0 make sense. */
+static float sync_white_cut=0.10; /* The cut used for positioning, not
+				    quantization */
+static float white_cut=0.06; /* 0 means cut in the black level, 1 cut in the
+			       white level, 0.5 cut in the middle etc. */
+static double minmax_filter=0.5; /* Dust/scratch removal filter. The input pixel size
+			     is multiplied with this and rounded down. Then so
+			     many cycles of max are performed and then the same
+			     amount of cycles of min. */
+static double pixel_blur=0.25; /*0.155  Approximate width of blur blot in terms of input
+			    pixel. */
+static double cross_trim=0.75; /* Such amount of input pixels (the big ones) will be
+			   trimmed from the cross prior to performing the fine
+			   search. */
+/* -------------------- END OF MAGIC CONSTANTS -------------------- */
+
+/* Allocates and fills in gamma table */
+static unsigned char *make_gamma_table(float gamma)
+{
+	unsigned char *t;
+	int i;
+
+	t=malloc(256);
+	if (!t){
+		fprintf(stderr,"Cannot allocated gamma table of 256 bytes!\n");
+		exit(1);
+	}
+	for (i=0;i<256;i++){
+		float r; /* Result */
+
+		/* White level is 255 not 256! */
+		r=255*pow((float)i/255, gamma);
+		t[i]=floor(r+0.5);
+	}
+
+	return t;
+}
+
+static void dump_newary(char *fname)
+{
+	FILE *f;
+	unsigned char *gamma_table;
+	unsigned char *ptr;
+
+	gamma_table=make_gamma_table(output_gamma);
+	if (!gamma_table) return;
+
+	/* Translate from linear photometric back to gamma compressed. The
+	 * output file will have the same gamma as the input one. */
+	 
+	for (ptr=newary;ptr<newary+width*height;ptr++)
+		*ptr=gamma_table[*ptr];
+
+	free(gamma_table);
+	f=fopen(fname,"w");
+	if (!f){
+		fprintf(stderr,"Warning: cannot open dumpfile %s: "
+			,fname);
+		return; /* No dump */
+	}
+
+	fprintf(f,"P5\n"
+		"%u %u\n"
+		"255\n"
+		,width, height);
+
+	fwrite(newary, width, height, f);
+	fclose(f);
+}
+
+/* Gamma corrects to photon counts and calculates histogram of the gamma
+ * corrected image. */
+static void calc_histogram(void)
+{
+	unsigned char *ptr;
+	unsigned char *end=ary+(unsigned long)width*height;
+	unsigned long long total=0;
+
+	memset(histogram, 0, sizeof(histogram));
+	for (ptr=ary;ptr<end;ptr++){
+		histogram[*ptr]++;
+	}
+
+	/* Calculate the sum of the histogram */
+	{
+		int i;
+		for (i=0; i<sizeof histogram/sizeof *histogram; i++)
+			total+=(unsigned long long)i*histogram[i];
+	}
+
+	average=(total+((width*height)>>1))/(width*height);
+	fprintf(stderr,"Average pixel value %u\n", average);
+}
+
+/* Analyzes, determines the cut level */
+static void analyze_cutlevel(void)
+{
+	float white, black;
+	unsigned long black_pixels, white_pixels;
+	int i;
+	float white_rms, black_rms; /* At the end they will be RMS of the
+				       distance from average */
+#define MAXITER 32
+	int iter; /* max. MAXITER iterations */
+	int lastcutlevel;
+
+	fill_global_cutlevel=global_cutlevel=average;
+
+	/* The second guess uses global_cutlevel from the first guess */
+	for (iter=0;iter<MAXITER;iter++){
+		lastcutlevel=global_cutlevel;
+		white_rms=black_rms=0;
+		black_pixels=white_pixels=0;
+		for (i=0;i<global_cutlevel;i++){
+			black_rms+=(float)histogram[i]
+				*(global_cutlevel-i)*(global_cutlevel-i);
+			black_pixels+=histogram[i];
+		}
+		for (i=global_cutlevel+1;i<sizeof histogram/sizeof *histogram;i++){
+			white_rms+=(float)histogram[i]
+				*(i-global_cutlevel)*(i-global_cutlevel);
+			white_pixels+=histogram[i];
+		}
+
+		/* Convert square sums to mean square */
+		white_rms/=white_pixels;
+		black_rms/=black_pixels;
+
+		/* Convert MS to RMS */
+		white_rms=sqrt(white_rms);
+		black_rms=sqrt(black_rms);
+
+		white=global_cutlevel+white_rms;
+		black=global_cutlevel-black_rms;
+
+		/* Cutlevel determined by sync_white_cut. sync_white_cut=0 means
+		 * cut at black level, 0.5 cut in the middle, 1 cut at the
+		 * white level */
+		global_cutlevel=floor(white*sync_white_cut
+				+black*(1-sync_white_cut)+0.5);
+		fill_global_cutlevel=floor(white*0.5+black*0.5+0.5);
+		fprintf(stderr,"Black %G, white %G, "
+			"cutlevel %u (0x%02x), "
+			"fill cutlevel %u (0x%02x)\n"
+			,black, white
+			,global_cutlevel, global_cutlevel
+			,fill_global_cutlevel, fill_global_cutlevel
+		);
+		if (global_cutlevel==lastcutlevel)
+			break; /* Stable state reached */
+	}
+	if (iter==MAXITER)
+		fprintf(stderr,"Warning: cutting point analysis didn't "
+			"converge in %u iterations.\n", MAXITER);
+}
+
+/* Returns -1 if fails. xin, yin are coordinates of the starting
+ * corner. dx is which way to go away from the corner horizontally and
+ * dy vertically. *outx, *outy will contain the address of the first black pixel
+ * or (-1, -1) if none is found. */
+static void diag_scan(int *outx, int *outy, int xin, int yin, int
+		dx, unsigned dy)
+{
+	int xbegin, x, y;
+	unsigned ctr, len;
+
+	for (xbegin=xin,len=1;xbegin<MIN(width,height);xbegin+=dx,len++){
+		x=xbegin;
+		y=yin;
+		for (ctr=len;ctr;ctr--,x-=dx,y+=dy){
+			if (getpixu(x,y)<global_cutlevel){
+				*outx=x;
+				*outy=y;
+				return;
+			}
+		}
+	}
+	*outx=-1;
+	*outy=-1;
+}
+
+/* Protection against buffer overrun. The coordinate is the coordinate of
+ * the mark center in a system where integers are in pixel upper left
+ * corners. Upper left pixel of the mark will be white. */
+static void mark(double x, double y)
+{
+	unsigned xu, yu;
+	xu=floor(x+0.5);
+	yu=floor(y+0.5);
+
+	writepixu((xu),(yu),0xff);
+	writepixu((xu-1),(yu-1),0xff);
+	writepixu((xu-1),yu,0);
+	writepixu((xu),(yu-1),0);
+}
+
+static void normalize_vector(double *x, double *y)
+{
+	double vectorlen;
+
+	vectorlen=sqrt(*x**x+*y**y);
+	*x/=vectorlen;
+	*y/=vectorlen;
+}
+
+/* Returns angle, from 0 to 360, of a normalized vector. System: +y up. */
+static double angle(double x, double y)
+{
+	double deg;
+
+	if (abs(x)>abs(y)){
+		/* Horizontal */
+		deg=180/M_PI*asin(y);
+		if (x<0) deg=180-deg;
+	}else{
+		/* Vertical */
+		deg=180/M_PI*asin(x);
+		if (y<0) deg=deg-90;
+		else deg=90-deg;
+	}
+	return deg;
+}
+
+/* Puts it -180...+180 */
+static double normalize_angle(double a)
+{
+	return remainder(a,360);
+}
+
+static void find_corners(void)
+{
+	int x,y;
+
+	diag_scan(&x, &y, 0, 0, 1, 1);
+	if (x<0){
+		static char failure []="failure_debug.pgm";
+		fprintf(stderr,"Error: cannot find upper left corner\n");
+fail:
+		fprintf(stderr,"See failure_debug.pgm why.\n");
+		memcpy(newary, ary, (unsigned long)width*height);
+		dump_newary(failure);
+		exit(1);
+	}
+	corners[0][0]=x;
+	corners[0][1]=y;
+
+	diag_scan(&x, &y, width-1, 0, -1, 1);
+	if (x<0){
+		fprintf(stderr,"Error: cannot find upper right corner\n");
+		goto fail;
+	}
+	corners[1][0]=x+1;
+	corners[1][1]=y;
+
+	diag_scan(&x, &y, 0, height-1, 1, -1);
+	if (x<0){
+		fprintf(stderr,"Error: cannot find lower left corner\n");
+		goto fail;
+	}
+	corners[2][0]=x;
+	corners[2][1]=y+1;
+
+	diag_scan(&x, &y, width-1, height-1, -1, -1);
+	if (x<0){
+		fprintf(stderr,"Error: cannot find lower right corner\n");
+		goto fail;
+	}
+	corners[3][0]=x+1;
+	corners[3][1]=y+1;
+
+	leftedge=MIN(corners[0][0],corners[2][0]);
+	rightedge=MAX(corners[1][0],corners[3][0]);
+	topedge=MIN(corners[0][1],corners[1][1]);
+	bottomedge=MAX(corners[2][1],corners[3][1]);
+
+	hpixel=(corners[1][0]+corners[3][0]
+		-corners[0][0]-corners[0][0])/2.0/WIDTH;
+	vpixel=(corners[2][1]+corners[3][1]
+		-corners[0][1]-corners[1][1])/2.0/format_height;
+	fprintf(stderr,"One bit is %G horizontal pixels and %G "
+			"vertical pixels.\n", hpixel, vpixel);
+
+
+	{
+		unsigned vchalf, hchalf;
+
+		/* Take only half to prevent spurious resync to an edge of the
+		 * cross when the data mimic the other half of the cross. */
+		hchalf=hpixel*CHALF*0.5;
+		vchalf=vpixel*CHALF*0.5;
+
+		chalf=MIN(hchalf, vchalf); 
+		/* Round to zero to make sure we don't catch any chaff */
+
+		/* Trim the cross by some fraction of input pixel to remove
+		 * the area affected by crosstalk. */
+		hchalf=hpixel*(CHALF-cross_trim);
+		vchalf=vpixel*(CHALF-cross_trim);
+
+		chalf_fine=MIN(hchalf, vchalf);
+	}
+	
+	/* Calculate the pixel vectors */
+	pixelhx=((double)corners[1][0]+(double)corners[3][0]
+		-(double)corners[0][0]-(double)corners[2][0])/2;
+	pixelhy=((double)corners[1][1]+(double)corners[3][1]
+		-(double)corners[0][1]-(double)corners[2][1])/2;
+	pixelvx=((double)corners[2][0]+(double)corners[3][0]
+		-(double)corners[0][0]-(double)corners[1][0])/2;
+	pixelvy=((double)corners[2][1]+(double)corners[3][1]
+		-(double)corners[0][1]-(double)corners[1][1])/2;
+
+	/* Normalize the horizontal vector (which may not be exactly
+	 * horizontal */
+	normalize_vector(&pixelhx, &pixelhy);
+	/* Normalize the vertical vector (which may not be exactly
+	 * vertical */
+	normalize_vector(&pixelvx, &pixelvy);
+	fprintf(stderr,"Input horizontal pixel vector %G,%G, vertical %G,%G."
+			" skew %G deg, perpendicularity %G deg.\n",
+			pixelhx, pixelhy, pixelvx, pixelvy
+			,normalize_angle(angle(pixelhx, -pixelhy)
+				+angle(pixelvx, -pixelvy)+90)/2
+			,angle(pixelhx, -pixelhy)-angle(pixelvx, -pixelvy));
+
+	{
+		unsigned long bytes=(long)(4*chalf+1)*(4*chalf+1)
+			*sizeof*search_area;
+		search_area=malloc(bytes);
+		if (!search_area){
+			fprintf(stderr,
+				"Cannot allocate search area of %lu bytes\n",
+				bytes);
+			exit(1);
+
+		}
+	}
+	fprintf(stderr,"Allocating search area of %u x %u (%u) pixels.\n",
+			chalf<<1, chalf<<1, (chalf*chalf)<<2);
+
+	fprintf(stderr,"Upper corners at %lu, %lu and %lu, %lu,\n"
+		"lower corners at %lu, %lu and %lu, %lu.\n"
+		"Cross half for searching is %d x %d input pixels.\n",
+		corners[0][0], corners[0][1], corners[1][0], corners[1][1],
+		corners[2][0], corners[2][1], corners[3][0], corners[3][1],
+		chalf, chalf);
+
+}
+
+static double bilinear(double ul, double ur,
+		double ll, double lr,
+		double hpar, double vpar)
+{
+	double u,l; /* Upper, lower */
+
+	u=ur*hpar+ul*(1-hpar);
+	l=lr*hpar+ll*(1-hpar);
+	return l*vpar+u*(1-vpar);
+}
+
+static float bilinearf(float ul, float ur,
+		float ll, float lr,
+		float hpar, float vpar)
+{
+	float u,l; /* Upper, lower */
+
+	u=ur*hpar+ul*(1-hpar);
+	l=lr*hpar+ll*(1-hpar);
+	return l*vpar+u*(1-vpar);
+}
+
+/* x,y with integers in centers of pixels */
+static float get_pixel_interp(double x, double y)
+{
+	unsigned xi, yi; /* Integer versions, rounded down */
+
+	/* Supports even extrapolation, but should be never necessary */
+	if (x<0) xi=0; else xi=floor(x);
+	if (y<0) yi=0; else yi=floor(y);
+
+	/* Make it faster, only little precision needed. */
+	return bilinearf(getpixu(xi,yi), getpixu(xi+1,yi),
+		     getpixu(xi,yi+1),getpixu(xi+1,yi+1),
+		     x-xi, y-yi);
+}
+
+/* Samples pixels and performs correction(s) */
+static float pixel_correct_sample(double x, double y)
+{
+	float val;
+	float avg; /* First sum, later average */
+	double hdist, vdist;
+
+	hdist=hpixel*unsharp_dist;
+	vdist=vpixel*unsharp_dist;
+
+	avg=get_pixel_interp(
+		PSHIFTX(x, -hdist, 0),
+		PSHIFTY(y, -hdist, 0));
+	avg+=get_pixel_interp(
+		PSHIFTX(x, hdist, 0),
+		PSHIFTY(y, hdist, 0));
+	avg+=get_pixel_interp(
+		PSHIFTX(x, 0, vdist),
+		PSHIFTY(y, 0, vdist));
+	avg+=get_pixel_interp(
+		PSHIFTX(x, 0, -vdist),
+		PSHIFTY(y, 0, -vdist));
+	avg/=4;
+
+
+	val=get_pixel_interp(x,y);
+	val+=unsharp_mask*(val-avg); /* Emphasize the distance from average */
+	return val;
+}
+
+/* Returns difference from global_cutlevel. Integers in centers of pixels. Interpolates
+ * for nonintegral coordinates. */
+static float diffpix(double x, double y)
+{
+	return get_pixel_interp(x,y)-global_cutlevel;
+}
+
+/* Calculates a correlation with a cross. x and y are coords of the cross
+ * center with integers in UL corners of pixels. */
+static float cross_correl(double x, double y)
+{
+	double dx, dy;
+	float sum =0;
+
+	/* -0.5 for conversion corners -> centers, +0.5 for conversion
+	 * cross center -> sample point 1/2 pixel away from the cross
+	 * center -> No addition at all */
+
+	for (dx=0;dx<chalf_fine;dx++)
+		for (dy=0;dy<chalf_fine;dy++){
+			sum-=diffpix(x+dx, y+dy);
+			sum-=diffpix(x-1-dx, y-1-dy);
+			sum+=diffpix(x+dx,y-1-dy);
+			sum+=diffpix(x-1-dx,y+dy);
+		}
+	return sum;
+}
+
+/* Range from 0 to 4*chalf, inclusive */
+static float getsearch(int xpos, int ypos)
+{
+	assert (xpos>=0);
+	assert (xpos<=4*chalf);
+	assert (ypos>=0);
+	assert (ypos<=4*chalf);
+
+	return search_area[ypos*(4*chalf+1)+xpos];
+}
+
+/* xpos says the cross offset. 0,0 means at the original position from around
+ * which the search_area was loaded. The range is -chalf to chalf
+ * (inclusive). The input must be in that range, otherwise crash */
+static float cross_correl_search(int xpos, int ypos)
+{
+	float sum;
+
+	assert(xpos>=-chalf);
+	assert(xpos<=chalf);
+	assert(ypos>=-chalf);
+	assert(ypos<=chalf);
+
+	/* Normalize the xpos and ypos to mean the cross center in array
+	 * indices. 0 means array left edge, 2*chalf array center, 4*chalf array
+	 * right edge. */
+
+	xpos+=2*chalf;
+	ypos+=2*chalf;
+
+	/* Center */
+	sum=-4*getsearch(xpos,ypos);
+
+	/* Middles of sides */
+	sum+=2*(
+		getsearch(xpos-chalf, ypos)+
+		getsearch(xpos+chalf, ypos)+
+		getsearch(xpos, ypos-chalf)+
+		getsearch(xpos, ypos+chalf)
+			);
+
+	/* Corners */
+	sum-=(
+		getsearch(xpos-chalf, ypos-chalf)+
+		getsearch(xpos-chalf, ypos+chalf)+
+		getsearch(xpos+chalf, ypos-chalf)+
+		getsearch(xpos+chalf, ypos+chalf)
+	     );
+
+	return sum;
+}
+
+/* After this, pixel [0][0] means integral from [0][0] to [1][1] (!), etc. */
+static void integrate_search_area(void)
+{
+	int x, y;
+	float *ptr;
+
+	/* Horizontal integration */
+	ptr=search_area;
+	for (y=0;y<=4*chalf;y++){
+		ptr++;
+		for (x=1;x<=4*chalf;x++){
+			ptr[0]+=ptr[-1];
+			ptr++;
+		}
+	}
+
+	ptr=search_area+4*chalf+1;
+
+	/* Vertical integration */
+	for (;ptr<search_area+(4*chalf+1)*(4*chalf+1);ptr++)
+		ptr[0]+=ptr[-4*chalf-1];
+			
+}
+
+static void cross_stats(unsigned cx, unsigned cy)
+{
+	double centerx=crosses[cx][cy][0];
+	double centery=crosses[cx][cy][1];
+	int hpixelhalf=floor(hpixel*(CHALF-cross_trim));
+	int vpixelhalf=floor(vpixel*(CHALF-cross_trim));
+	float black_rms=0, white_rms=0;
+	int xoff, yoff;
+	long val;
+	float white, black;
+	unsigned long whitepixels=0, blackpixels=0;
+	float cutlevel_result;
+
+	for (xoff=-hpixelhalf; xoff<=hpixelhalf; xoff++)
+		for (yoff=-vpixelhalf; yoff<=vpixelhalf; yoff++){
+			val=get_pixel_interp(
+				PSHIFTX(centerx, xoff, yoff)
+				,PSHIFTY(centery, xoff, yoff));
+			if (val>global_cutlevel){
+				/* White */
+				white_rms+=(val-global_cutlevel)*(val-global_cutlevel);
+				whitepixels++;
+			}else if (val<global_cutlevel){
+				/* Black */
+				black_rms+=(val-global_cutlevel)*(val-global_cutlevel);
+				blackpixels++;
+			}
+
+		}
+	if (!(whitepixels&&blackpixels)){
+		cutlevel_result=global_cutlevel;
+		/* Impossible to determine, use default global_cutlevel */
+	}else{
+		white_rms=sqrt(white_rms/whitepixels);
+		black_rms=sqrt(black_rms/blackpixels);
+		white=global_cutlevel+white_rms;
+		black=global_cutlevel-black_rms;
+		cutlevel_result=white*(white_cut)
+				+black*(1-white_cut);
+	}
+	cutlevels[cx][cy]=cutlevel_result;
+	fprintf(stderr,"%02x ",(int)floor(cutlevel_result+0.5));
+}
+
+/* Center of search area is in a system where the integers are in the
+ * corners. */
+static void load_search_area(double centerx, double centery)
+{
+	int xoff, yoff;
+	float *ptr=search_area;
+
+	for (yoff=-2*chalf-1; yoff<2*chalf; yoff++)
+		for (xoff=-2*chalf-1; xoff<2*chalf; xoff++){
+			if (yoff==-2*chalf-1||xoff==-2*chalf-1){
+				/* Zero row/column */
+				*ptr=0;
+			}else{
+				/* No translation necessary since centers
+				 * in corners automatically translate to
+				 * centers of adjacent pixels expressed
+				 * in a system with integers in centers. */
+				*ptr=diffpix(PSHIFTX(centerx, xoff, yoff)
+					,PSHIFTY(centery, xoff, yoff));
+			}
+			ptr++;
+		}
+}
+
+/* The coords are with integers in corners */
+static void resync_cross(double *coordpair)
+{
+	int xoff, yoff; /* Symmetric step offsets for search stepping always
+			   by 1 and once meaning 1, once meaning a subpixel
+			   step. They perform steps parallel to the recording
+			   axes. */
+	int xoffmax, yoffmax; /* Step during which the maximum was reached */
+	float max; /* How much was reached during maximum */
+	double xmax, ymax; /* Later it's calculated in which pixel position
+			      the maximum was calculated, with subpixel
+			      precision. Coords of cross center with integers
+			      in corners. */
+	float result;
+
+	load_search_area(coordpair[0], coordpair[1]);
+	integrate_search_area(); /* Precalculates - dynamic programming */
+
+	/* Preload with a default */
+	xoffmax=0;
+	yoffmax=0;
+	max=cross_correl_search(xoffmax,yoffmax);
+
+	/* Rough search - 1 pixel step */
+	for (xoff=-chalf;xoff<=chalf;xoff++)
+		for (yoff=-chalf;yoff<=chalf;yoff++){
+			result=cross_correl_search(xoff, yoff);
+			if (result>max)
+			{
+				max=result;
+				xoffmax=xoff;
+				yoffmax=yoff;
+			}
+		}
+	xmax=PSHIFTX(coordpair[0], xoffmax, yoffmax);
+	ymax=PSHIFTY(coordpair[1], xoffmax, yoffmax);
+
+#ifdef FINE_CROSS_RESYNC
+#define HALFRANGE (0.5/FINESTEP) /* 0.5 means 0.5 of small input pixel - no
+				    need to search more since then it would be
+				    caught by the neighbouring coarse search
+				    try. */
+	/* Load the fine search initial maximum position */
+	xoffmax=0;
+	yoffmax=0;
+
+	/* This must be here since cross_correl and cross_correl_search
+	 * return the result scaled by a different factor. */
+	max=cross_correl(xmax,ymax);
+
+	/* Fine search, FINESTEP pixels/ step. Counting in 0.25 steps */
+	for (xoff=-HALFRANGE;xoff<=HALFRANGE;xoff++) 
+		for (yoff=-HALFRANGE;yoff<=HALFRANGE;yoff++){
+			/* This is not using the search area anymore! */
+			result=cross_correl(
+				 PSHIFTX(xmax, (double)xoff*FINESTEP
+					,(double)yoff*FINESTEP)
+				,PSHIFTY(ymax, (double)xoff*FINESTEP
+					,(double)yoff*FINESTEP));
+			if (result>max){
+				max=result;
+				xoffmax=xoff;
+				yoffmax=yoff;
+			}
+		}
+	/* Save the fine search result */
+	xmax=PSHIFTX(xmax, (double)xoffmax*FINESTEP, (double)yoffmax*FINESTEP);
+	ymax=PSHIFTY(ymax, (double)xoffmax*FINESTEP, (double)yoffmax*FINESTEP);
+
+#endif /* FINE_CROSS_RESYNC */
+
+	/* Store the output */
+	coordpair[0]=xmax;
+	coordpair[1]=ymax;
+}
+
+static void sync_crosses(void)
+{
+	unsigned cx,cy; /* Cross number */
+	double rightx, righty, downx, downy; /* Two cross pitch vectors */
+
+	/* Calculate the estimated cross pitch vectors */
+	rightx=((double)corners[1][0]+corners[3][0]-corners[0][0]-corners[2][0])
+		/2*CPITCH/WIDTH;
+	righty=((double)corners[1][1]+corners[3][1]-corners[0][1]-corners[2][1])
+		/2*CPITCH/WIDTH;
+	downx=((double)corners[2][0]+corners[3][0]-corners[0][0]-corners[1][0])
+		/2*CPITCH/format_height;
+	downy=((double)corners[2][1]+corners[3][1]-corners[0][1]-corners[1][1])
+		/2*CPITCH/format_height;
+
+	/* Load the upper left cross with an estimate of it's position */
+	crosses[0][0][0]=bilinear(
+		corners[0][0], corners[1][0],
+		corners[2][0], corners[3][0],
+		(double)(BORDER+CHALF)/WIDTH,
+		(double)(BORDER+CHALF)/format_height);
+	crosses[0][0][1]=bilinear(
+		corners[0][1], corners[1][1],
+		corners[2][1], corners[3][1],
+		(double)(BORDER+CHALF)/WIDTH,
+		(double)(BORDER+CHALF)/format_height);
+
+	fprintf(stderr,"Finding crosses (%u lines), numbers indicate "
+			"individual cutlevels:\n", YCROSSES);
+
+	for (cy=0;cy<YCROSSES;cy++){
+		fprintf(stderr,"%3u: ",cy);
+		for (cx=0;cx<XCROSSES;cx++){
+			if (cx>0){
+				/* Copy from left */
+				crosses[cx][cy][0]=crosses[cx-1][cy][0]+rightx;
+				crosses[cx][cy][1]=crosses[cx-1][cy][1]+righty;
+			}else if (cy>0){
+				/* Copy from above */
+				crosses[cx][cy][0]=crosses[cx][cy-1][0]+downx;
+				crosses[cx][cy][1]=crosses[cx][cy-1][1]+downy;
+			}/* else already preloaded */
+			resync_cross(crosses[cx][cy]);
+			cross_stats(cx, cy);
+		}
+		putc('\n',stderr);
+	}
+}
+
+/* x,y coords in bit matrix. 0,0 is in the upper left cross UL corner.
+ * Returns pixel position with integers in centers of pixels. Interpolates
+ * also the cutlevel */
+static void bit_coord(double *xout, double *yout, float *cutlevel,
+		int x, int y)
+{
+	unsigned cx, cy; /* Cross number */
+	double xd, yd;
+	double xrem, yrem;
+
+	/* First find the cross numbers */
+	/* Division of negative numbers is probably undefined in C! */
+	if (x<CHALF) cx=0;
+	else cx=(x-CHALF)/CPITCH;
+	if (y<CHALF) cy=0;
+	else cy=(y-CHALF)/CPITCH;
+	if (cx>XCROSSES-2) cx=XCROSSES-2;
+	if (cy>YCROSSES-2) cy=YCROSSES-2;
+
+	/* Now subtrack cross coordinate */
+	x-=cx*CPITCH+CHALF;
+	y-=cy*CPITCH+CHALF;
+	/* x,y now the remainders. Can be negative or more than CPITCH! */
+
+	/* Calculate double precision remainders about from 0 to 1 (not always) */
+	xrem=((double)x+0.5)/CPITCH;
+	yrem=((double)y+0.5)/CPITCH;
+
+	xd=bilinear(
+		crosses[cx][cy][0], crosses[cx+1][cy][0],
+		crosses[cx][cy+1][0],crosses[cx+1][cy+1][0],
+		xrem, yrem);
+	yd=bilinear(
+		crosses[cx][cy][1], crosses[cx+1][cy][1],
+		crosses[cx][cy+1][1],crosses[cx+1][cy+1][1],
+		xrem, yrem);
+	if (cutlevel){
+	*cutlevel=bilinearf(
+		cutlevels[cx][cy], cutlevels[cx+1][cy],
+		cutlevels[cx][cy+1],cutlevels[cx+1][cy+1],
+		xrem, yrem);
+	}
+	/* xd, yd are now with integers in UL corners of pixels */
+	xd-=0.5;
+	yd-=0.5;
+	/* xd, yd are now with integers in centers of pixels */
+
+	*xout=xd;
+	*yout=yd;
+}
+
+static void read_payload_bit(unsigned char bit)
+{
+	static unsigned accu=1;
+
+	accu<<=1;
+	accu|=bit&1;
+	if (accu&(1<<8)){
+		putchar(accu&0xff);
+		accu=1;
+	}
+}
+
+#if FEC_ORDER !=1
+/* Cuts out given bit and shifts the upper part */
+static unsigned long shrink(unsigned long in, unsigned bitpos)
+{
+	unsigned long high;
+	in&=~(1<<bitpos); /* Zero out the bit */
+	high=in;
+	in&=(1UL<<bitpos)-1;
+	high^=in;
+	return (high>>1)|in;
+}
+#endif
+
+static void mark_bad_bit(unsigned x, unsigned y, int dir)
+{
+	int size=floor(2*sqrt(hpixel*vpixel)+0.5);
+	unsigned u;
+	int i;
+	int v=dir?0:255;
+
+	if (dir){
+		/* To 1, means black dirt. Upper left edge. */
+		for (u=0;u<leftedge;u++)
+			writepixu(u,y,0);
+		for (u=0;u<topedge;u++)
+			writepixu(x,u,0);
+	}else{
+		/* To 0, means white dirt. Lower right edge. */
+		for (u=rightedge;u<width;u++)
+			writepixu(u,y,0);
+		for (u=bottomedge;u<height;u++)
+			writepixu(x,u,0);
+	}
+
+	for (i=-size;i<=size;i++){
+		writepixu(x+i, y-size+1, v);
+		writepixu(x+i, y+size-1, v);
+		writepixu(x-size+1,y+i,v);
+		writepixu(x+size-1,y+i,v);
+	}
+	if (dir==2) v=0x80; else v^=0xff;
+	for (i=-size;i<=size;i++){
+		writepixu(x+i, y-size, v);
+		writepixu(x+i, y+size, v);
+		writepixu(x-size,y+i,v);
+		writepixu(x+size,y+i,v);
+	}
+
+}
+
+/* Bit 0 is the one which comes at the top of the page, although it's stored in
+ * bit FEC_LARGEBITS-1 in the Hamming register.
+ *
+ * 1 dir means flipped from 0 to 1 (black dirt), 0 dir means flipped
+ * from 1 to 0 (white dirt ), 2 dir means unknown
+ *
+ * Increments bad_01 or bad_10 and bad_total only for reparable errors.
+ * Leaves bad_irreparable alone. */
+static void print_badbit(unsigned symbol, unsigned bit, unsigned dir)
+{
+	unsigned seq;
+	int x, y;
+	double xd, yd; /* Integers in centers */
+	unsigned char delim;
+	
+	if (!(bad_total)){
+		fprintf(stderr,"The following coordinates have damaged bits. "
+				"\",\" is black dirt, \"'\" white dirt, \":\""
+				"bit which is a part of an irreparable symbol. "
+				"Exclamation marks (!) indicate irreparable "
+				"damage: ");
+	}
+
+	if (dir==1){
+		bad_01++;
+		bad_total++;
+	}
+	else if (dir==0){
+		bad_10++;
+		bad_total++;
+	}
+
+	seq=symbol+bit*FEC_SYMS;
+	seq2xy(&x, &y, seq);
+	bit_coord(&xd, &yd, NULL, x, y);
+	xd=floor(xd+0.5);
+	yd=floor(yd+0.5);
+	mark_bad_bit(xd, yd, dir);
+	assert(x>=0);
+	switch(dir){
+		case 0: delim='\''; break;
+		case 1: delim=','; break;
+		default: delim=':'; break;
+	}
+	fprintf(stderr,"%ld%c%ld ",(long)xd, delim, (long)yd);
+}
+
+static void print_badbit_finish(void)
+{
+	if (bad_total){
+		fprintf(stderr,"\n%lu bits bad from %lu, bit error rate %G%%. "
+				"%G%% black dirt, %G%% white dirt and "
+				"%lu (%G%%) irreparable.\n",
+				bad_total,
+				USEDBITS, 
+				100*(double)(bad_total)/USEDBITS,
+				100*(double)bad_01/(bad_total),
+				100*(double)bad_10/(bad_total),
+				irreparable,
+				100*(double)irreparable/(bad_total));
+	}
+	else fprintf(stderr,"No bad bits!\n");
+#if FEC_ORDER == 1
+	fprintf(stderr,"Golay stats\n"
+		       "===========\n"
+		"0 bad bits      %lu\n"
+		"1 bad bit       %lu\n"
+		"2 bad bits      %lu\n"
+		"3 bad bits      %lu\n"
+		"4 bad bits      %lu\n"
+		"total codewords %lu\n"
+	, golay_stats[0]
+	, golay_stats[1]
+	, golay_stats[2]
+	, golay_stats[3]
+	, golay_stats[4]
+	, golay_stats[0]+golay_stats[1]
+		+golay_stats[2]+golay_stats[3]+golay_stats[4]);
+#endif
+}
+
+void golay_bad_bits(unsigned long right, unsigned long wrong, unsigned
+		long symno)
+{
+	int bit; /* 23 MSB, 0 LSB */
+
+	for (bit=23; bit>=0;bit--){
+		if ((right^wrong)&(1UL<<bit)){
+			/* Error at this place */
+			print_badbit(symno, 23-bit, (wrong>>bit)&1);
+		}
+	}
+
+
+}
+
+static unsigned long ungolay(unsigned long in, unsigned long symno)
+{
+	unsigned data=in>>12;
+
+	if (golay(data)==in){
+		golay_stats[0]++;
+		return data; /* No error */
+	}
+
+	/* Search for a symbol that differs in max. 3 positions */
+	for (data=0;data<(1<<12);data++){
+		unsigned n_ones;
+		n_ones=ones(golay_codes[data]^in);
+		if (n_ones<=3){
+			/* Found the right answer */
+			golay_bad_bits(golay_codes[data],in, symno);
+			golay_stats[n_ones]++;
+			return data;
+		}
+
+	}
+
+	/* "data" is not valid anymore now! */
+
+	/* Irreparable */
+	{
+		int badbit;
+
+		fputc('\n',stderr);
+		for (badbit=0;badbit<24;badbit++)
+			print_badbit(symno, badbit, 2);
+		fprintf(stderr,"!\n");
+		irreparable+=4;
+		bad_total+=4;
+		golay_stats[4]++;
+		return in>>12; 
+	}
+
+}
+
+#if FEC_ORDER !=1
+/* symno is just to figure out xy when printing broken bits. Only the
+ * lowest FEC_LARGEBITS are taken into account on input. */
+static unsigned long unhamming(unsigned long in, unsigned long symno)
+{
+	unsigned bugpos=0;
+
+	/* Split the shift to make sure that it works even it FEC_LARGEBITS
+	 * is the full size of the type */
+	in&=(1UL<<(FEC_LARGEBITS-1)<<1)-1;
+#if FEC_ORDER>=5
+	bugpos|=parity(in&0xffff0000)<<4;
+#endif
+#if FEC_ORDER>=4
+	bugpos|=parity(in&0xff00ff00)<<3;
+#endif
+#if FEC_ORDER>=3
+	bugpos|=parity(in&0xf0f0f0f0)<<2;
+#endif
+	bugpos|=parity(in&0xcccccccc)<<1;
+	bugpos|=parity(in&0xaaaaaaaa);
+	if (bugpos){
+		in^=1UL<<bugpos;
+	}
+	if (parity(in)){
+		/* Bad parity */
+		if (bugpos){
+			unsigned bit;
+			/* Irreparable */
+			fprintf(stderr,"\n");
+			for (bit=0;bit<FEC_LARGEBITS;bit++)
+				print_badbit(symno, bit, 2);
+			irreparable+=2;
+			bad_total+=2;
+			fprintf(stderr,"!\n"); /* Cannot correct */
+		}
+		else{
+			/* Just flipped parity */
+			print_badbit(symno,FEC_LARGEBITS-1,in&1);
+		}
+	}else{
+		print_badbit(symno
+				, FEC_LARGEBITS-1-bugpos
+				,((~in)&1UL<<bugpos));
+	}
+
+#if FEC_ORDER>=5
+	in=shrink(in,16);
+#endif
+#if FEC_ORDER>=4
+	in=shrink(in,8);
+#endif
+#if FEC_ORDER>=3
+	in=shrink(in,4);
+#endif
+	in>>=3;
+	return in;
+}
+#endif /* FEC_ORDER */
+
+static void read_hamming_bit(unsigned char input, unsigned long symno)
+{
+	static unsigned accubits;
+	static unsigned long accu;
+
+	accu<<=1;
+	accu|=input&1;
+	accubits++;
+	if (accubits>=FEC_LARGEBITS){
+		int shift;
+#if FEC_ORDER == 1
+		accu=ungolay(accu, symno);
+#else
+		accu=unhamming(accu, symno);
+#endif /* FEC_ORDER */
+		for (shift=FEC_SMALLBITS-1;shift>=0;shift--)
+			read_payload_bit(accu>>shift);
+		accu=0;
+		accubits=0;
+	}
+}
+
+void reset_stats(void)
+{
+	bad_01=0;
+	bad_10=0;
+	bad_total=0;
+	irreparable=0;
+	memset(golay_stats, 0, sizeof golay_stats);
+}
+
+static void read_syms(void)
+{
+	unsigned long hamming_sym; /* Hamming symbol sequence number */
+	unsigned bit;
+	unsigned long seq;
+	int x,y; /* 0,0 is upper left pixel of upper left cross */
+	double xcoord, ycoord; /* Integers in centers */
+	float pixval;
+	float local_cutlevel;
+
+	reset_stats();
+
+	for (hamming_sym=0;hamming_sym<FEC_SYMS;hamming_sym++){
+		for (bit=0;bit<FEC_LARGEBITS;bit++){
+			/* Bit here will correspond to bit FEC_SMALLBITS-1
+			 * in the Hamming register. */
+			seq=hamming_sym+bit*FEC_SYMS;
+			seq2xy(&x, &y, seq);
+			bit_coord(&xcoord, &ycoord, &local_cutlevel, x, y);
+			pixval=pixel_correct_sample(xcoord, ycoord);
+
+			/* Possibly make a mark */
+			if (!(x&7)||!(y&7)){
+				int writeval;
+				
+				writeval=floor(pixval+0.5);
+				if (writeval>255) writeval=255;
+				else if (writeval<0) writeval=0;
+				writeval^=255;
+
+				writepix(xcoord+0.5, ycoord+0.5,
+					 writeval);
+					/* Make a debug dot */
+			}
+
+			read_hamming_bit(pixval<local_cutlevel, hamming_sym);
+		}
+	}
+
+	print_badbit_finish();
+}
+
+/* Doesn't depend on width and height. */
+static void print_chan_info(void)
+{
+	fprintf(stderr,"Unformatted channel capacity %G kB, ",
+			(double)WIDTH*format_height/8/1000);
+	fprintf(stderr,"formatted raw channel capacity %G kB, ",
+			(double)TOTALBITS/8/1000);
+	fprintf(stderr,"net "
+#if FEC_ORDER == 1
+			"Golay"
+#else
+			"Hamming"
+#endif
+			" payload capacity %G kB, ",
+			(double)NETBITS/8/1000);
+	fprintf(stderr,"%lu "
+#if FEC_ORDER == 1
+			"Golay"
+#else
+			"Hamming"
+#endif
+			" symbols, ", FEC_SYMS);
+	fprintf(stderr,"%lu bits unused (incomplete Hamming symbol), ",
+			TOTALBITS-USEDBITS);
+	fprintf(stderr,"border taking %G%% of unformatted capacity, ",
+			100*(1-(double)(DATA_WIDTH)*(DATA_HEIGHT)/WIDTH/format_height));
+	fprintf(stderr,"border with crosses taking %G%% of unformatted capacity, ",
+			100*(1-(double)(TOTALBITS)/WIDTH/format_height));
+	fprintf(stderr,"border with crosses and "
+#if FEC_ORDER == 1
+			"Golay"
+#else
+			"Hamming"
+#endif
+			" taking %G%% of "
+			"unformatted capacity.\n",
+			100*(1-(double)(NETBITS)/WIDTH/format_height));
+}
+
+static void print_marks(void)
+{
+	unsigned cx,cy; /* Cross number */
+
+	mark(corners[0][0], corners[0][1]);
+	mark(corners[1][0], corners[1][1]);
+	mark(corners[2][0], corners[2][1]);
+	mark(corners[3][0], corners[3][1]);
+
+	for (cy=0;cy<YCROSSES;cy++)
+		for (cx=0;cx<XCROSSES;cx++){
+			mark(crosses[cx][cy][0],crosses[cx][cy][1]);
+			mark(
+				 PSHIFTX(crosses[cx][cy][0], chalf, 0)
+				,PSHIFTY(crosses[cx][cy][1], chalf, 0));
+			mark(
+				 PSHIFTX(crosses[cx][cy][0], -chalf, 0)
+				,PSHIFTY(crosses[cx][cy][1], -chalf, 0));
+			mark(
+				 PSHIFTX(crosses[cx][cy][0], 0, chalf)
+				,PSHIFTY(crosses[cx][cy][1], 0, chalf));
+			mark(
+				 PSHIFTX(crosses[cx][cy][0], 0, -chalf)
+				,PSHIFTY(crosses[cx][cy][1], 0, -chalf));
+		}
+}
+
+/* Blurs ary into newary with the following kernel:
+ * 1 2 1
+ * 2 4 2
+ * 1 2 1
+ */
+static void blur_copy(void)
+{
+	unsigned char *dest;
+	unsigned char *src;
+	long yctr, xctr;
+	int val;
+	int cycles;
+	int blur_cycles;
+
+	/* Round to nearest */
+	blur_cycles=floor(vpixel*hpixel*pixel_blur*pixel_blur+0.5);
+
+	if (blur_cycles) fprintf(stderr,"Doing %d cycles of 1 2 1 / 2 4 2 /"
+			" 1 2 1 blur.\n" ,blur_cycles);
+
+	for (cycles=1;cycles<=blur_cycles;cycles++)
+	{
+		dest=newary;
+		src=ary;
+		memcpy(dest,src,width); /* Topmost row */
+		dest+=width;
+		src+=width;
+
+		for (yctr=height-2; yctr>0;yctr--){
+			*dest++=*src++; /* Leftmost pixel */
+			for (xctr=width-2;xctr>0;xctr--){
+				val=src[0]<<2;
+				val+=(src[-1]+src[1]+*(src-width)+src[width])<<1;
+				val+=*(src-1-width)+*(src-width+1)
+					+src[width-1]+src[width+1];
+				val=(val+8)>>4; /* 4+2+2+2+2+1+1+1+1=16 */
+				*dest++=val;
+				src++;
+			}
+			*dest++=*src++; /* Rightmost pixel */
+		}
+		memcpy(dest,src,width); /* Bottommost row */
+		memcpy(ary,newary,width*height);
+		fprintf(stderr,"%d ",cycles);
+	}
+	if (!blur_cycles) memcpy(newary,ary,width*height);
+	else fprintf(stderr,"\n");
+}
+
+/* Shifts half pixel right and down! */
+static void max(void)
+{
+	unsigned char *ptr, *end, *linestart;
+	unsigned long yctr;
+
+	ptr=ary+(unsigned long)width*height;
+	for (yctr=height;yctr;yctr--){
+		linestart=ptr-width;
+		ptr--;
+		for (; ptr>linestart; ptr--)
+			ptr[0]=MAX(ptr[0],ptr[-1]);
+	}
+
+	end=ary+width;
+	for (ptr=ary+(unsigned long)width*height-1;ptr>=end; ptr--)
+		ptr[0]=MAX(ptr[0],*(ptr-width));
+
+}
+
+/* Shifts half pixel left and up! */
+static void min(void)
+{
+	unsigned char *ptr;
+	unsigned char *end;
+	unsigned long yctr;
+
+	for (ptr=ary,yctr=height;yctr;yctr--){
+		for (end=ptr+width-1;ptr<end;ptr++)
+			ptr[0]=MIN(ptr[0],ptr[1]);
+		ptr++;
+	}
+
+	end=ary+(unsigned long)width*(height-1);
+	for (ptr=ary; ptr<end; ptr++)
+		ptr[0]=MIN(ptr[0],ptr[width]);
+
+}
+
+/* Calculate how many pixels */
+static void process_minmax(void)
+{
+	float npix;
+	int i;
+	
+	npix=sqrt(vpixel*hpixel); /* Average pixel */
+	npix*=minmax_filter;
+	npix=floor(npix);
+
+	if (npix) fprintf(stderr,"Doing %d cycles of max and %d cycles of min.\n",
+		(int)npix, (int)npix);
+
+	for (i=1;i<=npix;i++){
+		max();
+		fprintf(stderr,"%d ",i);
+	}
+	for (i=1;i<=npix;i++){
+		min();
+		fprintf(stderr,"%d ",i);
+	}
+	if (npix) fprintf(stderr,"\n");
+}
+
+/* Dimensions were originally fixed in macros. Now they are variable and can be
+ * passed through commandline. This routine reclaculates them after they are
+ * loaded from the commandline. */
+static void init_dimensions(void)
+{
+	format_height=2*BORDER+DATA_HEIGHT+text_height;
+}
+
+static void que_write(unsigned x, unsigned y)
+{
+	wptr->x=x;
+	wptr->y=y;
+	wptr++;
+	if (wptr>=que_end) wptr=que;
+	if (wptr==rptr){
+		fprintf(stderr,"unoptar: Floodfill que overflowed. Search "
+			"for \"que=malloc\" in the program and increase the "
+			"size.\n");
+		exit(1);
+	}
+}
+
+/* 1 OK, 0 empty */
+static int que_read(unsigned *x, unsigned *y)
+{
+	if(wptr==rptr) return 0; /* Empty */
+	*x=rptr->x;
+	*y=rptr->y;
+	rptr++;
+	if (rptr>=que_end) rptr=que;
+	return 1;
+}
+
+static void init_que(void)
+{
+	rptr=que;
+	wptr=que;
+}
+
+static void try_copy_white(unsigned x, unsigned y, char test)
+{
+	unsigned char *destptr;
+
+	if (test&&ary[(unsigned long)y*width+x]<fill_global_cutlevel) 
+		return; /* Black */
+	destptr=newary+(unsigned long)y*width+x;
+	if (!*destptr) return; /* Already copied through */
+	*destptr=0;
+	que_write(x,y);
+}
+
+/* Test: test for presence of white pixel in source, otherwise test just in
+ * the destination */
+static void fill(unsigned x, unsigned y, char test)
+{
+	init_que();
+	try_copy_white(x,y, test);
+	while (que_read(&x, &y)){
+		if (x+1<width) try_copy_white(x+1, y, test);
+		if (x) try_copy_white(x-1,y, test);
+		if (y+1<height) try_copy_white(x,y+1, test);
+		if (y) try_copy_white(x,y-1, test);
+	}
+}
+
+/* Or newary to ary */
+static void erase_dirt(void)
+{
+	unsigned char *src, *dest;
+	unsigned char *destend;
+	unsigned long dirt_pixels=0;
+
+	for (destend=ary+(unsigned long)width*height, src=newary, dest=ary
+			; dest<destend
+			;src++, dest++){
+		*dest|=*src;
+		dirt_pixels+=*src&1;
+	}
+	fprintf(stderr,"erased %lu pixels of dirt.\n", dirt_pixels);
+}
+
+/* Clobbers newary */
+static void remove_dirt_from_border(void)
+{
+	unsigned que_size;
+
+	que_size=((unsigned long)MAX(width, height)<<1)+5;
+	/* Not that I would really know the real bound */
+	que=malloc(que_size*sizeof *que);
+	if (!que){
+		fprintf(stderr,"Cannot allocate the fill que.\n");
+		exit(1);
+	}
+	que_end=que+que_size;
+
+	memset(newary, 0xff, (unsigned long)width*height);
+
+	fill(0,0,1);
+	fill(width>>1,0,1);
+	fill(width-1,0,1);
+	fill(0,height>>1,1);
+	fill(0,height-1,1);
+	fill(width-1, height-1,1);
+	fill(width-1, height>>1,1);
+	fill(width>>1, height-1,1);
+	fprintf(stderr,"white border identified, ");
+	fill(width>>1, height>>1, 0);
+	fprintf(stderr,"data area identified, ");
+	/* Now white parts and the data area are filled with 0xff in newary. */
+	erase_dirt();
+	free(que);
+}
+
+/* Produces already linear output! */
+void read_png(void)
+{
+	png_structp png_ptr;
+	png_infop info_ptr;
+	double gamma; /* gamma from the info in the file */
+	int y1,number_of_passes;
+	unsigned char **ptrs;
+	
+	png_ptr=png_create_read_struct(PNG_LIBPNG_VER_STRING,
+			NULL, NULL, NULL);
+	info_ptr=png_create_info_struct(png_ptr);
+	png_init_io(png_ptr,input_stream);
+	png_read_info(png_ptr, info_ptr);
+	width=png_get_image_width(png_ptr,info_ptr);
+	height=png_get_image_height(png_ptr,info_ptr);
+	fprintf(stderr,"Input %u x %u pixels, taking %G megabytes for 2 "
+			"framebuffers.\n"
+			,width, height, 2*(float)width*height/1e6);
+	if (png_get_gAMA(png_ptr,info_ptr, &gamma))
+		png_set_gamma(png_ptr, 1.0, gamma);
+	else
+		png_set_gamma(png_ptr, 1.0, 0.454545); /* Default gamma */
+	{
+		int bit_depth;
+		int color_type;
+
+		color_type=png_get_color_type(png_ptr, info_ptr);
+		bit_depth=png_get_bit_depth(png_ptr, info_ptr);
+		if (color_type==PNG_COLOR_TYPE_GRAY){
+			if (bit_depth<8){
+				 png_set_expand(png_ptr);
+			}
+			if (bit_depth==16){
+				 png_set_strip_16(png_ptr);
+			}
+		}
+		if (color_type==PNG_COLOR_TYPE_PALETTE){
+			png_set_expand(png_ptr);
+			png_set_rgb_to_gray(png_ptr,1, -1,-1);
+			/* Default weights to be used */
+		}
+		if (color_type & PNG_COLOR_MASK_ALPHA){
+			png_set_strip_alpha(png_ptr);
+		}
+		if (color_type==PNG_COLOR_TYPE_RGB ||
+			color_type==PNG_COLOR_TYPE_RGB_ALPHA){
+			png_set_rgb_to_gray(png_ptr, 1, -1, -1);
+			/* Default weights to be used */
+		}
+		
+	}
+	/* If the depth is different from 8 bits/gray, make the libpng expand
+	 * it to 8 bit gray.
+	 */
+	number_of_passes=png_set_interlace_handling(png_ptr);
+	png_read_update_info(png_ptr,info_ptr);
+	ary=malloc((unsigned long)width*height);
+	newary=malloc((unsigned long)width*height);
+	if (!(ary&&newary)){
+		fprintf(stderr,"Cannot allocate framebuffers.\n");
+		exit(1);
+	}
+	ptrs=malloc(height*sizeof(*ptrs));
+	if (!ptrs){
+		fprintf(stderr
+			,"Cannot allocate %lu bytes for auxilliary buffer\n"
+			,height*(unsigned long)(sizeof*ptrs));
+		exit(1);
+	}
+	for (y1=0;y1<height;y1++) ptrs[y1]=ary+width*y1;
+	for (;number_of_passes;number_of_passes--){
+		png_read_rows(png_ptr, ptrs, NULL, height);
+	}
+	png_read_end(png_ptr, NULL);
+	free(ptrs);
+	fclose(input_stream);
+}
+
+
+/* The file must be already opened in input_stream. filename must be long enough
+ * so that .png at the end can be replaced with _debug.pgm. */
+static void process_file(char *filename)
+{
+
+	fprintf(stderr,"Decoding PNG file %s...\n", filename);
+	read_png(); /* Reads *and* closes input_stream*/
+
+	calc_histogram();
+	analyze_cutlevel();
+	/* now fill_global_cutlevel and global_cutlevel are valid */
+
+	fprintf(stderr,"Removing dirt from the white border: ");
+	remove_dirt_from_border();
+
+	fprintf(stderr,"Searching for the corners.\n");
+	find_corners(); /* Also calculates chalf and pixel vectors. */
+	/* After find_corners, hpixel and vpixel are valid. */
+	sync_crosses();
+
+	/* Minmax is before blur because before blur, narrow cracks and spots
+	 * can be distinguished in size from wide shallow depressions. Otherwise
+	 * we couldn't distinguish them apart - we would lose information. */
+	process_minmax();
+	blur_copy();
+
+	/* Prints the crashtest dummy marks. */
+	print_marks();
+
+	/* Now comes the decoding itself. */
+	read_syms();
+	free(ary);
+	free(search_area);
+
+	strcpy((void *)(filename+strlen(filename)-4),
+			"_debug.pgm");
+	fprintf(stderr,"Writing debug image into %s.\n", filename);
+	dump_newary(filename); /* Also recompresses with gamma. */
+	free(newary);
+}
+
+static void process_files(char *base)
+{
+	char *longer; /* Longer filename */
+	unsigned alloclen;
+	unsigned file_number=0;
+
+	alloclen=strlen(base)+1+4+1+5+1+3+1;
+	longer=malloc(alloclen); /* _ 0001 _ debug . pgm \0 */
+	if (!longer){
+		fprintf(stderr,"unoptar: cannot allocate output base\n");
+		exit(1);
+	}
+	while(1){
+		if (file_number>=9999){
+			fprintf(stderr,"unoptar: Too many pages - 10,000 or "
+					"more.\n");
+			exit(1);
+		}
+		snprintf(longer, alloclen-6,"%s_%04u.png",
+			base, ++file_number);
+		/* 6 for "_debug" */
+
+		input_stream=fopen(longer, "r");
+		if (!input_stream)
+		{
+			if (file_number==1){
+				/* We didn't have any files! */
+				fprintf(stderr,"unoptar: cannot open %s: "
+					,longer);
+				free(longer);
+				perror("");
+				exit(1);
+			}else{
+				free(longer);
+				return;
+			}
+		}
+		process_file(longer); /* Clobbers longer! Automatically closes
+					 input_stream! */
+	}
+
+}
+
+static void parse_format(char *format)
+{
+	unsigned dummy;
+
+	sscanf(format,"%u-%u-%u-%u-%u-%u-%u-%u",
+			&dummy,
+			&dummy,
+			&dummy,
+			&dummy,
+			&dummy,
+			&dummy,
+			&dummy,
+			&text_height);
+	fprintf(stderr,"Format: text height=%u\n", text_height);
+}
+
+/* argv:
+ * input filename base (mandatory). For example "base" will produce
+ * 	base_0001.png and base_0001_debug.pgm. 
+ * text height (optional, defaults to 24)
+ */
+int main(int argc, char **argv)
+{
+	if (argc<3){
+		fprintf(stderr,"usage: unoptar <format>"
+			" <input filename base>\n");
+		exit(1);
+	}
+
+	parse_format(argv[1]);
+	/* This must after all dimension-related parameters are decoded. */
+	init_dimensions();
+
+	print_chan_info();
+	process_files(argv[2]);
+
+	return 0;
+}