ref: 84599735f9e9e101f3f7a93002127b60248c7fa3
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 1.37 2002/07/20 17:23:15 giles Exp $
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#ifdef HAVE_GETOPT_H
# include <getopt.h>
#else
# include "getopt.h"
#endif
#include "os_types.h"
#include "sha1.h"
#include "jbig2.h"
#include "jbig2_image.h"
typedef enum {
usage,dump,render
} jbig2dec_mode;
typedef struct {
jbig2dec_mode mode;
int verbose, hash;
SHA1_CTX *hash_ctx;
char *output_file;
} jbig2dec_params_t;
static int print_version(void);
static int print_usage(void);
/* page hashing functions */
static void
hash_init(jbig2dec_params_t *params)
{
params->hash_ctx = malloc(sizeof(SHA1_CTX));
if (params->hash == NULL) {
fprintf(stderr, "unable to allocate hash state\n");
params->hash = 0;
return;
} else {
SHA1_Init(params->hash_ctx);
}
}
static void
hash_image(jbig2dec_params_t *params, Jbig2Image *image)
{
unsigned int N = image->stride * image->height;
SHA1_Update(params->hash_ctx, image->data, N);
}
static void
hash_print(jbig2dec_params_t *params, FILE *out)
{
unsigned char md[SHA1_DIGEST_SIZE];
char digest[2*SHA1_DIGEST_SIZE + 1];
int i, len;
SHA1_Final(params->hash_ctx, md);
for (i = 0; i < SHA1_DIGEST_SIZE; i++) {
snprintf(&(digest[2*i]), 3, "%02x", md[i]);
}
fprintf(out, "%s", digest);
}
static void
hash_free(jbig2dec_params_t *params)
{
free(params->hash_ctx);
params->hash_ctx = NULL;
}
static int
parse_options(int argc, char *argv[], jbig2dec_params_t *params)
{
static struct option long_options[] = {
{"version", 0, NULL, 'V'},
{"help", 0, NULL, 'h'},
{"quiet", 0, NULL, 'q'},
{"verbose", 2, NULL, 'v'},
{"dump", 0, NULL, 'd'},
{"hash", 0, NULL, 'm'},
{"output", 1, NULL, 'o'},
{NULL, 0, NULL, 0}
};
int option_idx = 1;
int option;
while (1) {
option = getopt_long(argc, argv,
"Vh?qvdo:", 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 'v':
if (optarg) params->verbose = atoi(optarg);
else params->verbose = 9;
break;
case 'h':
case '?':
params->mode = usage;
break;
case 'V':
/* the GNU Coding Standards suggest --version should
override all other options */
print_version();
exit(0);
break;
case 'd':
params->mode=dump;
break;
case 'm':
params->hash = 1;
break;
case 'o':
params->output_file = strdup(optarg);
break;
default:
if (!params->verbose) fprintf(stdout,
"unrecognized option: -%c\n", option);
break;
}
}
return (optind);
}
static int
print_version (void)
{
fprintf(stdout, "%s %s\n", PACKAGE, VERSION);
return 0;
}
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"
" -h --help this usage summary\n"
" -q --quiet suppress diagnostic output\n"
" -v --verbose set the verbosity level\n"
" -d --dump print the structure of the jbig2 file\n"
" rather than explicitly decoding\n"
" --version program name and version information\n"
" --hash print a hash of the decode document\n"
" -o <file> send decoded output to <file>\n"
" Defaults to the the input with a different\n"
" extension. Pass '-' for stdout.\n"
"\n"
);
return 1;
}
static int
error_callback(void *error_callback_data, const char *buf, Jbig2Severity severity,
int32_t seg_idx)
{
jbig2dec_params_t *params = error_callback_data;
char *type;
char segment[22];
switch (severity) {
case JBIG2_SEVERITY_DEBUG:
if (params->verbose < 3) return 0;
type = "DEBUG"; break;;
case JBIG2_SEVERITY_INFO:
if (params->verbose < 2) return 0;
type = "info"; break;;
case JBIG2_SEVERITY_WARNING:
if (params->verbose < 1) return 0;
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 char *
make_output_filename(const char *input_filename, const char *extension)
{
char *output_filename;
const char *c, *e;
int len;
if (extension == NULL) {
fprintf(stderr, "make_output_filename called with no extension!\n");
exit (1);
}
if (input_filename == NULL)
c = "out";
else {
/* strip any leading path */
c = strrchr(input_filename, '/'); /* *nix */
if (c == NULL)
c = strrchr(input_filename, '\\'); /* win32/dos */
if (c != NULL)
c++; /* skip the path separator */
else
c = input_filename; /* no leading path */
}
/* make sure we haven't just stripped the last character */
if (*c == '\0')
c = "out";
/* strip the extension */
len = strlen(c);
e = strrchr(c, '.');
if (e != NULL)
len -= strlen(e);
/* allocate enough space for the base + ext */
output_filename = malloc(len + strlen(extension) + 1);
if (output_filename == NULL) {
fprintf(stderr, "couldn't allocate memory for output_filename\n");
exit (1);
}
strncpy(output_filename, c, len);
strncpy(output_filename + len, extension, strlen(extension));
*(output_filename + len + strlen(extension)) = '\0';
/* return the new string */
return (output_filename);
}
static int
write_page_image(jbig2dec_params_t *params, Jbig2Image *image)
{
if (!strncmp(params->output_file, "-", 2))
{
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
{
if (params->verbose > 1)
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;
}
static int
write_document_hash(jbig2dec_params_t *params)
{
FILE *out;
if (!strncmp(params->output_file, "-", 2)) {
out = stderr;
} else {
out = stdout;
}
fprintf(out, "Hash of decoded document: ");
hash_print(params, out);
fprintf(out, "\n");
return 0;
}
int
main (int argc, char **argv)
{
FILE *f = NULL, *f_page = NULL;
Jbig2Ctx *ctx;
uint8_t buf[4096];
jbig2dec_params_t params;
int filearg;
// set defaults
params.mode = render;
params.verbose = 1;
params.hash = 0;
params.output_file = NULL;
filearg = parse_options(argc, argv, ¶ms);
if (params.hash) hash_init(¶ms);
switch (params.mode) {
case usage:
print_usage();
exit (0);
break;
case dump:
fprintf(stderr, "Sorry, segment dump not yet implemented\n");
break;
case render:
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, ¶ms);
// pull the whole file/global stream into memory
for (;;)
{
int n_bytes = fread(buf, 1, sizeof(buf), f);
if (n_bytes <= 0)
break;
jbig2_data_in(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_data_in(ctx, buf, n_bytes);
}
fclose(f_page);
jbig2_global_ctx_free(global_ctx);
}
// retrieve and output the returned pages
{
Jbig2Image *image;
/* work around broken CVision embedded streams */
if (f_page != NULL)
jbig2_complete_page(ctx);
if (params.output_file == NULL)
{
#ifdef HAVE_LIBPNG
params.output_file = make_output_filename(argv[filearg], ".png");
#else
params.output_file = make_output_filename(argv[filearg], ".pbm");
#endif
}
/* retrieve and write out all the completed pages */
while ((image = jbig2_page_out(ctx)) != NULL) {
write_page_image(¶ms, image);
if (params.hash) hash_image(¶ms, image);
jbig2_release_page(ctx, image);
}
if (params.hash) write_document_hash(¶ms);
}
jbig2_ctx_free(ctx);
} /* end params.mode switch */
if (params.hash) hash_free(¶ms);
// fin
return 0;
}