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/* pbmtogem.c - read a portable bitmap and produce a GEM .img file
**
** Author: David Beckemeyer (bdt!david)
**
** Much of the code for this program was taken from other
** pbmto* programs. I just modified the code to produce
** a .img header and generate .img "Bit Strings".
**
** Thanks to Diomidis D. Spinellis for the .img header format.
**
** Copyright (C) 1988 by David Beckemeyer (bdt!david) and Jef Poskanzer.
**
** Modified by Johann Haider to produce Atari ST compatible files
**
** Permission to use, copy, modify, and distribute this software and its
** documentation for any purpose and without fee is hereby granted, provided
** that the above copyright notice appear in all copies and that both that
** copyright notice and this permission notice appear in supporting
** documentation. This software is provided "as is" without express or
** implied warranty.
*/
/*
* 92/07/11 jh
*
* Changes made to this program:
* changed header length to count words to conform with Atari ST documentation
* removed rounding of the imagewidth to the next word boundary
* removed arbitrary limit to imagewidth
* changed pattern length to 1 to simplify locating of compressible parts
* in real world images
* add solid run and pattern run compression
*
* Deficiencies:
* Compression of repeated scanlines not added
*
* Johann Haider (jh@fortec.tuwien.ac.at)
*
* 94/01/31 Andreas Schwab (schwab@ls5.informatik.uni-dortmund.de)
* Changed to remove architecture dependencies
* Added compression of repeated scanlines
*
* Feb 2010 afu
* Added dimension check to prevent short int from overflowing
* Changed code style (ANSI-style function definitions, etc.)
*/
#include <stdio.h>
#include <string.h>
#include "pbm.h"
#define SOLID_0 0
#define SOLID_1 0xff
#define MINRUN 4
#define INT16MAX 32767
#define putsolid(v,c) putc((v&0x80)|c, stdout)
#define putpattern(v,c) putc(0, stdout);putc(c, stdout);putc(v, stdout)
static short item;
static int outcol, outmax;
static short bitsperitem, bitshift;
static short linerepeat;
static unsigned char *outrow, *lastrow;
static void
putinit (int const rows, int const cols)
{
if (pm_writebigshort (stdout, (short) 1) == -1 /* Image file version */
|| pm_writebigshort (stdout, (short) 8) == -1 /* Header length */
|| pm_writebigshort (stdout, (short) 1) == -1 /* Number of planes */
|| pm_writebigshort (stdout, (short) 1) == -1 /* Pattern length */
|| pm_writebigshort (stdout, (short) 372) == -1 /* Pixel width */
|| pm_writebigshort (stdout, (short) 372) == -1 /* Pixel height */
|| pm_writebigshort (stdout, (short) cols) == -1
|| pm_writebigshort (stdout, (short) rows) == -1)
pm_error ("write error");
item = 0;
bitsperitem = 0;
bitshift = 7;
outcol = 0;
outmax = (cols + 7) / 8;
outrow = (unsigned char *) pm_allocrow (outmax, sizeof (unsigned char));
lastrow = (unsigned char *) pm_allocrow (outmax, sizeof (unsigned char));
linerepeat = -1;
}
static void
putitem( )
{
outrow[outcol++] = item;
item = 0;
bitsperitem = 0;
bitshift = 7;
}
static void
putbit( bit const b )
{
if ( bitsperitem == 8 )
putitem( );
++bitsperitem;
if ( b == PBM_BLACK )
item += 1 << bitshift;
--bitshift;
}
static void
putstring ( unsigned char *p, int n)
{
#ifdef DEBUG
fprintf (stderr, "Bitstring, length: %d, pos %d\n", n, outcol);
#endif
(void) putc((char) 0x80, stdout); /* a Bit string */
(void) putc(n, stdout); /* count */
fwrite( p, n, 1, stdout );
}
static void
flushrow( )
{
unsigned char *outp, *p, *q;
int count;
int col = outmax;
if (linerepeat > 1)
{
/* Put out line repeat count */
fwrite ("\0\0\377", 3, 1, stdout);
putchar (linerepeat);
}
for (outp = p = lastrow; col > 0;)
{
for (q = p, count=0; (count < col) && (*q == *p); q++,count++);
if (count > MINRUN)
{
if (p > outp)
{
putstring (outp, p-outp);
outp = p;
}
col -= count;
switch (*p)
{
case SOLID_0:
#ifdef DEBUG
/* if (outcol > 0) */
fprintf (stderr, "Solid run 0, length: %d\n", count);
#endif
putsolid (SOLID_0, count);
break;
case SOLID_1:
#ifdef DEBUG
fprintf (stderr, "Solid run 1, length: %d, pos %d\n", count, outcol);
#endif
putsolid (SOLID_1, count);
break;
default:
#ifdef DEBUG
fprintf (stderr, "Pattern run, length: %d\n", count);
#endif
putpattern (*p, count);
break;
}
outp = p = q;
}
else
{
p++;
col--;
}
}
if (p > outp)
putstring (outp, p-outp);
if (ferror (stdout))
pm_error ("write error");
}
static void
putrow( )
{
if (bitsperitem > 0)
putitem ();
outcol = 0;
if (linerepeat == -1 || linerepeat == 255
|| memcmp (outrow, lastrow, outmax) != 0)
{
unsigned char *temp;
if (linerepeat != -1) /* Unless first line */
flushrow ();
/* Swap the pointers */
temp = outrow; outrow = lastrow; lastrow = temp;
linerepeat = 1;
}
else
/* Repeated line */
linerepeat++;
}
int
main( int argc, char* argv[])
{
FILE* ifp;
bit* bitrow;
int rows, cols, format, row, col;
pbm_init( &argc, argv );
if ( argc > 2 )
pm_usage( "[pbmfile]" );
if ( argc == 2 )
ifp = pm_openr( argv[1] );
else
ifp = stdin;
pbm_readpbminit( ifp, &cols, &rows, &format );
if( rows>INT16MAX || cols>INT16MAX )
pm_error ("Input image is too large.");
bitrow = pbm_allocrow( cols );
putinit (rows, cols);
for ( row = 0; row < rows; ++row )
{
#ifdef DEBUG
fprintf (stderr, "row %d\n", row);
#endif
pbm_readpbmrow( ifp, bitrow, cols, format );
for ( col = 0; col < cols; ++col )
putbit( bitrow[col] );
putrow( );
}
flushrow ();
pm_close( ifp );
exit( 0 );
}
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