ref: f4a16df4d230a900f2068a268103184da90097e4
dir: /jbig2dec.c/
/*
jbig2dec
Copyright (C) 2001-2002 artofcode LLC.
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.
$Id: jbig2dec.c,v 1.25 2002/06/22 10:08:43 giles Exp $
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef HAVE_GETOPT_H
# include <getopt.h>
#else
# include "getopt.h"
#endif
#include "jbig2.h"
#include "jbig2_image.h"
typedef enum {
usage,dump,render
} jbig2dec_mode;
typedef struct {
jbig2dec_mode mode;
int verbose;
char *output_file;
} jbig2dec_params_t;
static int
print_usage (void)
{
fprintf(stderr,
"Usage: jbig2dec [options] <file.jbig2>\n"
" or jbig2dec [options] <global_stream> <page_stream>\n"
"\n"
" When invoked with a single file, it attempts to parse it as\n"
" a normal jbig2 file. Invoked with two files, it treats the\n"
" first as the global segments, and the second as the segment\n"
" stream for a particular page. This is useful for examining\n"
" embedded streams.\n"
"\n"
" available options:\n"
" -q --quiet suppress diagnostic output\n"
" -d --dump print the structure of the jbig2 file,\n"
" rather than explicitly decoding\n"
" -o <file> send decoded output to <file>. defaults to the same\n"
" filename as the input with a different extension.\n"
" -h --help this usage summary.\n"
"\n"
);
return 1;
}
static int
parse_options(int argc, char *argv[], jbig2dec_params_t *params)
{
static struct option long_options[] = {
{"quiet", 0, NULL, 'q'},
{"help", 0, NULL, 'h'},
{"dump", 0, NULL, 'd'},
{"output", 1, NULL, 'o'},
{NULL, 0, NULL, 0}
};
int option_idx = 1;
int option;
while (1) {
option = getopt_long(argc, argv,
"qhdo:", long_options, &option_idx);
if (option == -1) break;
fprintf(stderr, "option '%c' value '%s'\n", option, optarg);
switch (option) {
case 0: // unknown long option
if (!params->verbose) fprintf(stdout,
"unrecognized option: --%s\n",
long_options[option_idx].name);
break;
case 'q':
params->verbose=0;
break;
case 'h':
case '?':
print_usage();
exit (0);
case 'd':
params->mode=dump;
break;
case 'o':
params->output_file = strdup(optarg);
break;
default:
if (!params->verbose) fprintf(stdout,
"unrecognized option: -%c\n", option);
break;
}
}
fprintf(stderr, "final option index %d out of %d\n", optind, argc);
return (optind);
}
static int
error_callback(void *error_callback_data, const char *buf, Jbig2Severity severity,
int32_t seg_idx)
{
char *type;
char segment[22];
switch (severity) {
case JBIG2_SEVERITY_DEBUG: type = "DEBUG"; break;;
case JBIG2_SEVERITY_INFO: type = "info"; break;;
case JBIG2_SEVERITY_WARNING: type = "WARNING"; break;;
case JBIG2_SEVERITY_FATAL: type = "FATAL ERROR"; break;;
default: type = "unknown message"; break;;
}
if (seg_idx == -1) segment[0] = '\0';
else snprintf(segment, sizeof(segment), "(segment 0x%02x)", seg_idx);
fprintf(stderr, "jbig2dec %s %s %s\n", type, buf, segment);
return 0;
}
static int
write_page_image(jbig2dec_params_t *params, Jbig2Image *image)
{
if (!strcmp(params->output_file, "-"))
{
fprintf(stderr, "writing decoded page to stdout\n");
#ifdef HAVE_LIBPNG
jbig2_image_write_png(image, stdout);
#else
jbig2_image_write_pbm(image, stdout);
#endif
}
else
{
fprintf(stderr, "saving decoded page as '%s'\n", params->output_file);
#ifdef HAVE_LIBPNG
jbig2_image_write_png_file(image, params->output_file);
#else
jbig2_image_write_pbm_file(image, params->output_file);
#endif
}
return 0;
}
int
main (int argc, char **argv)
{
FILE *f = NULL, *f_page = NULL;
Jbig2Ctx *ctx;
uint8_t buf[4096];
jbig2dec_params_t params = {usage,1,NULL};
int filearg;
filearg = parse_options(argc, argv, ¶ms);
if (params.output_file == NULL)
{
#ifdef HAVE_LIBPNG
params.output_file = "out.png";
#else
params.output_file = "out.pbm";
#endif
}
if ((argc - filearg) == 1)
// only one argument--open as a jbig2 file
{
char *fn = argv[filearg];
f = fopen(fn, "rb");
if (f == NULL)
{
fprintf(stderr, "error opening %s\n", fn);
return 1;
}
}
else if ((argc - filearg) == 2)
// two arguments open as separate global and page streams
{
char *fn = argv[filearg];
char *fn_page = argv[filearg+1];
f = fopen(fn, "rb");
if (f == NULL)
{
fprintf(stderr, "error opening %s\n", fn);
return 1;
}
f_page = fopen(fn_page, "rb");
if (f_page == NULL)
{
fprintf(stderr, "error opening %s\n", fn_page);
return 1;
}
}
else
// any other number of arguments
return print_usage();
ctx = jbig2_ctx_new(NULL, f_page != NULL ? JBIG2_OPTIONS_EMBEDDED : 0,
NULL,
error_callback, NULL);
// pull the whole file/global stream into memory
for (;;)
{
int n_bytes = fread(buf, 1, sizeof(buf), f);
if (n_bytes <= 0)
break;
jbig2_write(ctx, buf, n_bytes);
}
fclose(f);
// if there's a local page stream read that in its entirety
if (f_page != NULL)
{
Jbig2GlobalCtx *global_ctx = jbig2_make_global_ctx(ctx);
ctx = jbig2_ctx_new(NULL, JBIG2_OPTIONS_EMBEDDED, global_ctx,
error_callback, NULL);
for (;;)
{
int n_bytes = fread(buf, 1, sizeof(buf), f_page);
if (n_bytes <= 0)
break;
jbig2_write(ctx, buf, n_bytes);
}
fclose(f_page);
jbig2_global_ctx_free(global_ctx);
}
// retrieve and output the returned pages
{
Jbig2Image *image;
while ((image = jbig2_get_page(ctx)) != NULL) {
write_page_image(¶ms, image);
jbig2_release_page(ctx, image);
}
}
jbig2_ctx_free(ctx);
// fin
return 0;
}