/*
* pbmtojbg85 - Portable Bitmap to JBIG converter (T.85 version)
*
* Markus Kuhn - http://www.cl.cam.ac.uk/~mgk25/jbigkit/
*/
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include "jbig85.h"
char *progname; /* global pointer to argv[0] */
/*
* Print usage message and abort
*/
static void usage(void)
{
fprintf(stderr,
"PBMtoJBIG converter " JBG85_VERSION " (T.85 version) --\n"
"creates bi-level image entity (BIE) as output file\n\n"
"usage: %s [<options>] [<input-file> | - [<output-file>]]\n\n"
"options:\n\n", progname);
fprintf(stderr,
" -s number\theight of a stripe\n");
fprintf(stderr,
" -m number\tmaximum adaptive template pixel horizontal offset (default 8)\n"
" -p number\toptions byte value: add TPBON=8, LRLTWO=64\n"
"\t\t(default 8 = TPBON)\n");
fprintf(stderr,
" -C string\tadd the provided string as a comment marker segment\n");
fprintf(stderr,
" -Y yi yr\tannounce in header initially the larger image height yi\n"
"\t\tand then announce after line yr has been encoded the real height\n"
"\t\tusing NEWLEN marker (for testing NEWLEN and VLENGTH=1 function)\n\n");
exit(1);
}
/*
* malloc() with exception handler
*/
void *checkedmalloc(size_t n)
{
void *p;
if ((p = malloc(n)) == NULL) {
fprintf(stderr, "Sorry, not enough memory available!\n");
exit(1);
}
return p;
}
/*
* Read an ASCII integer number from file f and skip any PBM
* comments which are encountered.
*/
static unsigned long getint(FILE *f)
{
int c;
unsigned long i;
while ((c = getc(f)) != EOF && !isdigit(c))
if (c == '#')
while ((c = getc(f)) != EOF && !(c == 13 || c == 10)) ;
if (c != EOF) {
ungetc(c, f);
fscanf(f, "%lu", &i);
}
return i;
}
/*
* Callback procedure which is used by JBIG encoder to deliver the
* encoded data. It simply sends the bytes to the output file.
*/
static void data_out(unsigned char *start, size_t len, void *file)
{
fwrite(start, len, 1, (FILE *) file);
return;
}
int main (int argc, char **argv)
{
FILE *fin = stdin, *fout = stdout;
const char *fnin = NULL, *fnout = NULL;
int i, j, c;
int all_args = 0, files = 0;
unsigned long x, y;
unsigned long width, height;
size_t bpl;
char type;
unsigned char *p, *lines, *next_line;
unsigned char *prev_line = NULL, *prevprev_line = NULL;
struct jbg85_enc_state s;
int mx = -1;
unsigned long l0 = 0, yi = 0, yr = 0;
char *comment = NULL;
int options = JBG_TPBON;
/* parse command line arguments */
progname = argv[0];
for (i = 1; i < argc; i++) {
if (!all_args && argv[i][0] == '-')
if (argv[i][1] == 0) {
if (files++) usage();
} else
for (j = 1; j > 0 && argv[i][j]; j++)
switch(argv[i][j]) {
case '-' :
all_args = 1;
break;
case 0 :
if (files++) usage();
break;
case 'Y':
if (i+2 >= argc) usage();
j = -1;
yi = atol(argv[++i]);
yr = atol(argv[++i]);
break;
case 'p':
if (++i >= argc) usage();
j = -1;
options = atoi(argv[i]);
break;
case 's':
if (++i >= argc) usage();
j = -1;
l0 = atol(argv[i]);
break;
case 'm':
if (++i >= argc) usage();
j = -1;
mx = atoi(argv[i]);
break;
case 'C':
if (++i >= argc) usage();
j = -1;
comment = argv[i];
break;
default:
usage();
}
else
switch (files++) {
case 0: fnin = argv[i]; break;
case 1: fnout = argv[i]; break;
default:
usage();
}
}
/* open input file */
if (fnin) {
fin = fopen(fnin, "rb");
if (!fin) {
fprintf(stderr, "Can't open input file '%s", fnin);
perror("'");
exit(1);
}
} else
fnin = "<stdin>";
/* read PBM header */
while ((c = getc(fin)) != EOF && (isspace(c) || c == '#'))
if (c == '#')
while ((c = getc(fin)) != EOF && !(c == 13 || c == 10)) ;
type = getc(fin);
if (c != 'P' || (type != '1' && type != '4')) {
fprintf(stderr, "Input file '%s' does not look like a PBM file!\n", fnin);
exit(1);
}
width = getint(fin);
height = getint(fin);
fgetc(fin); /* skip line feed */
/* Test for valid parameters */
if (width < 1 || height < 1) {
fprintf(stderr, "Image dimensions must be positive!\n");
exit(1);
}
/* allocate buffer for a single image line */
bpl = (width >> 3) + !!(width & 7); /* bytes per line */
lines = (unsigned char *) checkedmalloc(bpl * 3);
/* open output file */
if (fnout) {
fout = fopen(fnout, "wb");
if (!fout) {
fprintf(stderr, "Can't open input file '%s", fnout);
perror("'");
exit(1);
}
} else
fnout = "<stdout>";
/* initialize parameter struct for JBIG encoder*/
jbg85_enc_init(&s, width, yi ? yi : height, data_out, fout);
/* Specify a few other options (each is ignored if negative) */
if (yi)
options |= JBG_VLENGTH;
if (comment) {
s.comment_len = strlen(comment);
s.comment = (unsigned char *) comment;
}
jbg85_enc_options(&s, options, l0, mx);
for (y = 0; y < height; y++) {
/* Use a 3-line ring buffer, because the encoder requires that the two
* previously supplied lines are still in memory when the next line is
* processed. */
next_line = lines + (y%3)*bpl;
switch (type) {
case '1':
/* PBM text format */
p = next_line;
for (x = 0; x <= ((width-1) | 7); x++) {
*p <<= 1;
if (x < width)
*p |= getint(fin) & 1;
if ((x & 7) == 7)
++p;
}
break;
case '4':
/* PBM raw binary format */
fread(next_line, bpl, 1, fin);
break;
default:
fprintf(stderr, "Unsupported PBM type P%c!\n", type);
exit(1);
}
if (ferror(fin)) {
fprintf(stderr, "Problem while reading input file '%s", fnin);
perror("'");
exit(1);
}
if (feof(fin)) {
fprintf(stderr, "Unexpected end of input file '%s'!\n", fnin);
exit(1);
}
/* JBIG compress another line and write out result via callback */
jbg85_enc_lineout(&s, next_line, prev_line, prevprev_line);
prevprev_line = prev_line;
prev_line = next_line;
/* adjust final image height via NEWLEN */
if (yi && y == yr)
jbg85_enc_newlen(&s, height);
}
/* check for file errors and close fout */
if (ferror(fout) || fclose(fout)) {
fprintf(stderr, "Problem while writing output file '%s", fnout);
perror("'");
exit(1);
}
return 0;
}