ref: 2d6d6e0c7b2c97e52a3363eae09841a17fe8e272
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 1.18 2002/06/04 16:47:09 giles Exp $
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#ifdef HAVE_GETOPT_H
# include <getopt.h>
#else
# include "getopt.h"
#endif
#include "jbig2.h"
typedef enum {
usage,dump,render
} jbig2dec_mode;
typedef struct {
jbig2dec_mode mode;
int verbose;
char *output_file;
} jbig2dec_params_t;
#ifdef DEAD_CODE
int32
get_bytes (Jbig2Ctx_foo *ctx, byte *buf, int size, int off)
{
int n_bytes;
fseek(ctx->f, off, SEEK_SET);
n_bytes = fread(buf, 1, size, ctx->f);
if (n_bytes < size)
ctx->eof = TRUE;
return n_bytes;
}
static Jbig2Ctx_foo *
jbig2_open (FILE *f)
{
byte buf[9];
const byte header[8] = { 0x97, 0x4a, 0x42, 0x32, 0x0d, 0x0a, 0x1a, 0x0a };
Jbig2Ctx_foo *ctx;
/* Annex D.4 */
ctx = (Jbig2Ctx_foo *)malloc(sizeof(Jbig2Ctx_foo));
ctx->f = f;
ctx->eof = FALSE;
get_bytes(ctx, buf, 9, 0);
if (memcmp(buf, header, 8))
{
printf("not a JBIG2 file\n");
return NULL;
}
ctx->flags = buf[8];
if (ctx->flags & JBIG2_FILE_FLAGS_PAGECOUNT_UNKNOWN)
{
ctx->offset = 9; /* number of pages unknown */
ctx->n_pages = 0;
}
else
{
ctx->offset = 13;
ctx->n_pages = get_int32(ctx, 9);
}
if(!(ctx->flags & JBIG2_FILE_FLAGS_SEQUENTIAL_ACCESS)) {
printf("warning: random access header organization.\n");
printf("we don't handle that yet.\n");
free(ctx);
return NULL;
}
return ctx;
}
static Jbig2Ctx_foo *
jbig2_open_embedded (FILE *f_globals, FILE *f_page)
{
Jbig2Ctx_foo *ctx;
ctx = (Jbig2Ctx_foo *)malloc(sizeof(Jbig2Ctx_foo));
ctx->f = f_globals;
ctx->eof = 0;
ctx->offset = 0;
return ctx;
}
static Jbig2SegmentHeader *
jbig2_read_segment_header (Jbig2Ctx_foo *ctx)
{
Jbig2SegmentHeader *result = (Jbig2SegmentHeader *)malloc(sizeof(Jbig2SegmentHeader));
int offset = ctx->offset;
byte rtscarf;
int32 rtscarf_long;
int referred_to_segment_count;
/* 7.2.2 */
result->segment_number = get_int32(ctx, offset);
if (ctx->eof)
{
free(result);
return NULL;
}
/* 7.2.3 */
get_bytes(ctx, &result->flags, 1, offset + 4);
/* 7.2.4 */
get_bytes(ctx, &rtscarf, 1, offset + 5);
if ((rtscarf & 0xe0) == 0xe0)
{
/* FIXME: we break on non-seekable streams with this,
but for now it's shorter */
rtscarf_long = get_int32(ctx, offset + 5);
referred_to_segment_count = (rtscarf_long & 0x1ffffffc) >> 2;
offset += 5 + 4 + (referred_to_segment_count + 1)/8;
}
else
{
referred_to_segment_count = (rtscarf >> 5);
offset += 6 + referred_to_segment_count;
}
result->referred_to_segment_count = referred_to_segment_count;
/* todo: read referred to segment numbers */
/* 7.2.6 */
if (result->flags & 0x40) {
result->page_association = get_int32(ctx, offset);
offset += 4;
} else {
byte spa;
get_bytes(ctx, &spa, 1, offset);
result->page_association = spa;
offset += 1;
}
/* 7.2.7 */
result->data_length = get_int32 (ctx, offset);
ctx->offset = offset + 4;
return result;
}
#endif /* DEAD_CODE */
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)
{
fprintf(stderr, "%s\n", buf);
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 ((argc - filearg) == 1)
{
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)
{
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
return print_usage();
ctx = jbig2_ctx_new(NULL, f_page != NULL ? JBIG2_OPTIONS_EMBEDDED : 0,
NULL,
error_callback, NULL);
for (;;)
{
int n_bytes = fread(buf, 1, sizeof(buf), f);
if (n_bytes <= 0)
break;
jbig2_write(ctx, buf, n_bytes);
}
fclose(f);
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);
}
jbig2_ctx_free(ctx);
return 0;
}