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/* pbmtoybm.c - read a pbm and write a file for Bennet Yee's 'xbm' and 'face'
** programs.
**
** Written by Jamie Zawinski based on code (C) 1988 by Jef Poskanzer.
**
** 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.
**
** Feb 2010 afu
** Added dimension check to prevent short int from overflowing
** Changed code style (ANSI-style function definitions, etc.)
*/
#include <stdio.h>
#include "pm.h"
#include "pbm.h"
#define YBM_MAGIC ( ( '!' << 8 ) | '!' )
#define INT16MAX 32767
static long item;
static int bitsperitem, bitshift;
static void
putitem(void) {
pm_writebigshort(stdout, item);
item = 0;
bitsperitem = 0;
bitshift = 0;
}
static void
putinit(int const cols,
int const rows) {
pm_writebigshort(stdout, YBM_MAGIC);
pm_writebigshort(stdout, cols);
pm_writebigshort(stdout, rows);
item = 0;
bitsperitem = 0;
bitshift = 0;
}
static void
putbit(bit const b) {
if (bitsperitem == 16)
putitem();
++bitsperitem;
if (b == PBM_BLACK)
item += 1 << bitshift;
++bitshift;
}
static void
putrest(void) {
if (bitsperitem > 0)
putitem();
}
int
main(int argc, const char *argv[]) {
FILE * ifP;
bit * bitrow;
int rows;
int cols;
int format;
unsigned int padright;
unsigned int row;
const char * inputFile;
pm_proginit(&argc, argv);
if (argc-1 < 1)
inputFile = "-";
else {
inputFile = argv[1];
if (argc-1 > 2)
pm_error("Too many arguments. The only argument is the optional "
"input file name");
}
ifP = pm_openr(inputFile);
pbm_readpbminit(ifP, &cols, &rows, &format);
if (rows > INT16MAX || cols > INT16MAX)
pm_error("Input image is too large.");
bitrow = pbm_allocrow(cols);
/* Compute padding to round cols up to the nearest multiple of 16. */
padright = ((cols + 15) / 16) * 16 - cols;
putinit(cols, rows);
for (row = 0; row < rows; ++row) {
unsigned int col;
pbm_readpbmrow(ifP, bitrow, cols, format);
for (col = 0; col < cols; ++col)
putbit(bitrow[col]);
for (col = 0; col < padright; ++col)
putbit(0);
}
if (ifP != stdin)
fclose(ifP);
putrest();
return 0;
}
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