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/*
* cistopbm: Convert images in the CompuServe RLE format to PBM
* Copyright (C) 2009 John Elliott
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 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
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "pbm.h"
/* The maximum length of a run. Limit it to 0x5E bytes so that it is always
* represented by a printable character 0x20-0x7E */
#define MAXRUNLENGTH 0x5E
static void syntax(const char *prog)
{
pm_usage(" { options } { input } }\n\n"
"Input file should be in PBM format.\n"
"Output will be in CompuServe RLE format.\n"
"Options:\n"
"-i, --inverse: Reverse black and white.\n"
"-w, --whitebg: White background.\n"
"--: End of options\n\n"
"pbmtocis v1.00, Copyright 2009 John Elliott <jce@seasip.demon.co.uk>\n"
"This program is redistributable under the terms of the GNU General Public\n"
"License, version 2 or later.\n"
);
}
int main(int argc, const char **argv)
{
FILE *ofP = stdout;
FILE *ifP;
int inoptions = 1;
int n, x, y;
int bg = PBM_BLACK; /* Default colouring is white on black */
int inverse = 0;
int cell, last, run;
const char *inpname = NULL;
int outh, outw;
int height, width;
bit **bits;
pm_proginit(&argc, argv);
for (n = 1; n < argc; n++)
{
if (!strcmp(argv[n], "--"))
{
inoptions = 0;
continue;
}
if (inoptions)
{
if (pm_keymatch(argv[n], "-h", 2) ||
pm_keymatch(argv[n], "-H", 2) ||
pm_keymatch(argv[n], "--help", 6))
{
syntax(argv[0]);
return EXIT_SUCCESS;
}
if (pm_keymatch(argv[n], "-i", 2) ||
pm_keymatch(argv[n], "-I", 2) ||
pm_keymatch(argv[n], "--inverse", 9))
{
inverse = 1;
continue;
}
if (pm_keymatch(argv[n], "-w", 2) ||
pm_keymatch(argv[n], "-W", 2) ||
pm_keymatch(argv[n], "--whitebg", 9))
{
bg = PBM_WHITE;
continue;
}
if (argv[n][0] == '-' && argv[n][1] != 0)
{
pm_message("Unknown option: %s", argv[n]);
syntax(argv[0]);
return EXIT_FAILURE;
}
}
if (inpname == NULL) inpname = argv[n];
else { syntax(argv[0]); return EXIT_FAILURE; }
}
if (inpname == NULL) inpname = "-";
ifP = pm_openr(inpname);
/* Load the PBM */
bits = pbm_readpbm(ifP, &width, &height);
if (width <= 128 && height <= 96) { outw = 128; outh = 96; }
else if (width <= 256 && height <= 192) { outw = 256; outh = 192; }
else
{
outw = 256;
outh = 192;
pm_message("Warning: Input file is larger than 256x192. "
"It will be cropped.");
}
/* Write the magic number */
fputc(0x1B, ofP);
fputc(0x47, ofP);
fputc((outw == 128) ? 0x4D : 0x48, ofP);
/* And now start encoding */
y = x = 0;
last = PBM_BLACK;
run = 0;
while (y < outh)
{
if (x < width && y < height)
{
cell = bits[y][x];
if (inverse) cell ^= (PBM_BLACK ^ PBM_WHITE);
}
else cell = bg;
if (cell == last) /* Cell is part of current run */
{
++run;
if (run > MAXRUNLENGTH)
{
fputc(0x20 + MAXRUNLENGTH, ofP);
fputc(0x20, ofP);
run -= MAXRUNLENGTH;
}
}
else /* change */
{
fputc(run + 0x20, ofP);
last = last ^ (PBM_BLACK ^ PBM_WHITE);
run = 1;
}
++x;
if (x >= outw) { x = 0; ++y; }
}
if (last == bg) /* Last cell written was background. Write foreground */
{
fputc(run + 0x20, ofP);
}
else if (run) /* Write background and foreground */
{
fputc(run + 0x20, ofP);
fputc(0x20, ofP);
}
/* Write the end-graphics signature */
fputc(0x1B, ofP);
fputc(0x47, ofP);
fputc(0x4E, ofP);
pm_close(ifP);
return 0;
}
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