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/* $Header: /home/cvsroot/dvipdfmx/src/xbb.c,v 1.13 2008/05/22 10:08:02 matthias Exp $
This is extractbb, a bounding box extraction program.
Copyright (C) 2008 by Jin-Hwan Cho <chofchof@ktug.or.kr>
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 <time.h>
#include <string.h>
#include "system.h"
#include "mem.h"
#include "error.h"
#include "mfileio.h"
#include "numbers.h"
#include "pdfobj.h"
#include "pdfparse.h"
#include "config.h"
#ifdef HAVE_LIBPNG
#include <png.h>
#endif
#include "xbb.h"
#define XBB_PROGRAM "extractbb"
#define XBB_VERSION "Version 0.2"
static void usage(void)
{
fprintf (stderr, "%s, version %s, Copyright (C) 2008 by Jin-Hwan Cho\n",
XBB_PROGRAM, XBB_VERSION);
fprintf (stderr, "A bounding box extraction utility from PDF, PNG, and JPG.\n");
fprintf (stdout, "\nThis is free software; you can redistribute it and/or modify\n");
fprintf (stdout, "it under the terms of the GNU General Public License as published by\n");
fprintf (stdout, "the Free Software Foundation; either version 2 of the License, or\n");
fprintf (stdout, "(at your option) any later version.\n");
fprintf (stderr, "\nUsage: %s [-v] [-b] [-m|-x] [files]\n", XBB_PROGRAM);
fprintf (stderr, "\t-b\tWrite output file in binary mode\n");
fprintf (stderr, "\t-m\tOutput .bb file used in DVIPDFM\n");
fprintf (stderr, "\t-x\tOutput .xbb file used in DVIPDFMx (default)\n");
fprintf (stderr, "\t-v\tVerbose\n");
exit(1);
}
static char verbose = 0;
static void do_time(FILE *file)
{
time_t current_time;
struct tm *bd_time;
time(¤t_time);
bd_time = localtime(¤t_time);
fprintf(file, "%%%%CreationDate: %s\n", asctime(bd_time));
}
const char *extensions[] = {
".jpeg", ".JPEG", ".jpg", ".JPG", ".pdf", ".PDF", ".png", ".PNG"
};
static int xbb_output_mode = XBB_OUTPUT;
static char *make_xbb_filename(const char *name)
{
int i;
char *result;
for (i = 0; i < sizeof(extensions) / sizeof(extensions[0]); i++) {
if (strlen(extensions[i]) < strlen(name) &&
strncmp(name+strlen(name)-strlen(extensions[i]), extensions[i], strlen(extensions[i])) == 0)
break;
}
if (i == sizeof(extensions) / sizeof(extensions[0])) {
fprintf(stderr, "Warning: %s: Filename does not end in a recognizeable extension.\n", name);
result = NEW(strlen(name)+3, char);
strcpy(result, name);
} else { /* Remove extension */
result = NEW(strlen(name)+3-strlen(extensions[i])+1, char);
strncpy(result, name, strlen(name)-strlen(extensions[i]));
result[strlen(name)-strlen(extensions[i])] = 0;
}
strcat(result, (xbb_output_mode == XBB_OUTPUT ? ".xbb" : ".bb"));
return result;
}
static const char *xbb_file_mode = FOPEN_W_MODE;
static void write_xbb(char *fname, int bbllx, int bblly, int bburx, int bbury)
{
char *outname;
FILE *fp;
outname = make_xbb_filename(fname);
if ((fp = MFOPEN(outname, xbb_file_mode)) == NULL) {
fprintf(stderr, "Unable to open output file: %s\n", outname);
RELEASE(outname);
return;
}
if (verbose) {
fprintf(stderr, "Writing to %s: ", outname);
fprintf(stderr, "Bounding box: %d %d %d %d\n", bbllx, bblly, bburx, bbury);
}
fprintf(fp,"%%%%Title: %s\n", fname);
fprintf(fp,"%%%%Creator: %s %s\n", XBB_PROGRAM, XBB_VERSION);
fprintf(fp,"%%%%BoundingBox: %d %d %d %d\n", bbllx, bblly, bburx, bbury);
do_time(fp);
RELEASE(outname);
MFCLOSE(fp);
}
typedef enum {
JM_SOF0 = 0xc0, JM_SOF1 = 0xc1, JM_SOF2 = 0xc2, JM_SOF3 = 0xc3,
JM_SOF5 = 0xc5, JM_DHT = 0xc4, JM_SOF6 = 0xc6, JM_SOF7 = 0xc7,
JM_SOF9 = 0xc9, JM_SOF10 = 0xca, JM_SOF11 = 0xcb, JM_DAC = 0xcc,
JM_SOF13 = 0xcd, JM_SOF14 = 0xce, JM_SOF15 = 0xcf,
JM_RST0 = 0xd0, JM_RST1 = 0xd1, JM_RST2 = 0xd2, JM_RST3 = 0xd3,
JM_RST4 = 0xd4, JM_RST5 = 0xd5, JM_RST6 = 0xd6, JM_RST7 = 0xd7,
JM_SOI = 0xd8, JM_EOI = 0xd9, JM_SOS = 0xda, JM_DQT = 0xdb,
JM_DNL = 0xdc, JM_DRI = 0xdd, JM_DHP = 0xde, JM_EXP = 0xdf,
JM_APP0 = 0xe0, JM_APP2 = 0xe2, JM_APP14 = 0xee, JM_APP15 = 0xef,
JM_COM = 0xfe
} JPEG_marker;
static JPEG_marker JPEG_get_marker (FILE *fp)
{
int c = fgetc(fp);
if (c != 255) return -1;
for (;;) {
c = fgetc(fp);
if (c < 0) return -1;
else if (c > 0 && c < 255) return c;
}
return -1;
}
static int check_for_jpeg (FILE *fp)
{
unsigned char jpeg_sig[2];
rewind(fp);
if (fread(jpeg_sig, sizeof(unsigned char), 2, fp) != 2) return 0;
else if (jpeg_sig[0] != 0xff || jpeg_sig[1] != JM_SOI) return 0;
return 1;
}
static int jpeg_get_info (FILE *fp, int *width, int *height)
{
JPEG_marker marker;
unsigned short length;
int count;
float xdensity = 1.0, ydensity = 1.0;
char app_sig[128];
if (!check_for_jpeg(fp)) {
rewind(fp);
return -1;
}
rewind(fp);
count = 0;
while ((marker = JPEG_get_marker(fp)) >= 0) {
if (marker == JM_SOI || (marker >= JM_RST0 && marker <= JM_RST7)) {
count++; continue;
}
length = get_unsigned_pair(fp) - 2;
switch (marker) {
case JM_SOF0: case JM_SOF1: case JM_SOF2: case JM_SOF3:
case JM_SOF5: case JM_SOF6: case JM_SOF7: case JM_SOF9:
case JM_SOF10: case JM_SOF11: case JM_SOF13: case JM_SOF14:
case JM_SOF15:
get_unsigned_byte(fp);
if (xbb_output_mode != XBB_OUTPUT) { /* EBB_OUTPUT */
xdensity = ydensity = 72.0 / 100.0;
}
*height = (int)(get_unsigned_pair(fp) * ydensity + 0.5);
*width = (int)(get_unsigned_pair(fp) * xdensity + 0.5);
return 0;
case JM_APP0:
if (length > 5) {
if (fread(app_sig, sizeof(char), 5, fp) != 5) return -1;
length -= 5;
if (!memcmp(app_sig, "JFIF\000", 5)) {
int units, xden, yden;
get_unsigned_pair(fp);
units = (int)get_unsigned_byte(fp);
xden = (int)get_unsigned_pair(fp);
yden = (int)get_unsigned_pair(fp);
switch (units) {
case 1: /* pixels per inch */
xdensity = 72.0 / xden;
ydensity = 72.0 / yden;
break;
case 2: /* pixels per centimeter */
xdensity = 72.0 / 2.54 / xden;
ydensity = 72.0 / 2.54 / yden;
break;
default:
break;
}
length -= 7;
}
}
seek_relative(fp, length);
break;
default:
seek_relative(fp, length);
break;
}
count++;
}
return -1;
}
static void do_jpeg (FILE *fp, char *filename)
{
int width, height;
if (jpeg_get_info(fp, &width, &height) < 0) {
fprintf (stderr, "%s does not look like a JPEG file...\n", filename);
return;
}
write_xbb(filename, 0, 0, width, height);
return;
}
#ifdef HAVE_LIBPNG
static int check_for_png (FILE *png_file)
{
unsigned char sigbytes[4];
rewind (png_file);
if (fread(sigbytes, 1, sizeof(sigbytes), png_file) != sizeof(sigbytes) ||
(png_sig_cmp (sigbytes, 0, sizeof(sigbytes)))) return 0;
else return 1;
}
static int png_get_info(FILE *png_file, int *width, int *height)
{
png_structp png_ptr;
png_infop png_info_ptr;
png_uint_32 xppm, yppm;
rewind(png_file);
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (png_ptr == NULL || (png_info_ptr = png_create_info_struct(png_ptr)) == NULL) {
if (png_ptr) png_destroy_read_struct(&png_ptr, NULL, NULL);
return -1;
}
png_init_io(png_ptr, png_file);
png_read_info(png_ptr, png_info_ptr);
*width = (int)png_get_image_width(png_ptr, png_info_ptr);
*height = (int)png_get_image_height(png_ptr, png_info_ptr);
if (xbb_output_mode == XBB_OUTPUT) {
xppm = png_get_x_pixels_per_meter(png_ptr, png_info_ptr);
yppm = png_get_y_pixels_per_meter(png_ptr, png_info_ptr);
if (xppm > 0)
*width = (int)(*width * 72.0 / 0.0254 / xppm + 0.5);
if (yppm > 0)
*height = (int)(*height * 72.0 / 0.0254 / yppm + 0.5);
} else { /* EBB_OUTPUT */
*width = (int)(*width * 72.0 / 100.0 + 0.5);
*height = (int)(*height * 72.0 / 100.0 + 0.5);
}
return 0;
}
static void do_png (FILE *fp, char *filename)
{
int width, height;
if (png_get_info(fp, &width, &height) < 0) {
fprintf (stderr, "%s does not look like a PNG file...\n", filename);
return;
}
write_xbb(filename, 0, 0, width, height);
return;
}
#endif /* HAVE_LIBPNG */
static int rect_equal (pdf_obj *rect1, pdf_obj *rect2)
{
int i;
if (!rect1 || !rect2) return 0;
for (i = 0; i < 4; i++) {
if (pdf_number_value(pdf_get_array(rect1, i)) != pdf_number_value(pdf_get_array(rect2, i))) return 0;
}
return 1;
}
static int pdf_get_info (FILE *image_file, char *filename, int *llx, int *lly, int *urx, int *ury)
{
pdf_obj *page_tree;
pdf_obj *bbox;
pdf_file *pf;
page_tree = NULL;
{
pdf_obj *trailer, *catalog;
pf = pdf_open(filename, image_file);
if (!pf)
return -1;
trailer = pdf_file_get_trailer(pf);
if (pdf_lookup_dict(trailer, "Encrypt")) {
WARN("This PDF document is encrypted.");
pdf_release_obj(trailer);
pdf_close(pf);
return -1;
}
catalog = pdf_deref_obj(pdf_lookup_dict(trailer, "Root"));
if (!catalog) {
WARN("Catalog isn't where I expect it.");
pdf_close(pf);
return -1;
}
pdf_release_obj(trailer);
page_tree = pdf_deref_obj(pdf_lookup_dict(catalog, "Pages"));
pdf_release_obj(catalog);
}
if (!page_tree) {
WARN("Page tree not found.");
pdf_close(pf);
return -1;
}
{
pdf_obj *kids_ref, *kids;
pdf_obj *crop_box;
pdf_obj *tmp;
tmp = pdf_lookup_dict(page_tree, "MediaBox");
bbox = tmp ? pdf_deref_obj(tmp) : NULL;
tmp = pdf_lookup_dict(page_tree, "CropBox");
crop_box = tmp ? pdf_deref_obj(tmp) : NULL;
while ((kids_ref = pdf_lookup_dict(page_tree, "Kids")) != NULL) {
kids = pdf_deref_obj(kids_ref);
pdf_release_obj(page_tree);
page_tree = pdf_deref_obj(pdf_get_array(kids, 0));
pdf_release_obj(kids);
if ((tmp = pdf_deref_obj(pdf_lookup_dict(page_tree, "MediaBox")))) {
if (bbox)
pdf_release_obj(bbox);
bbox = tmp;
}
if ((tmp = pdf_deref_obj(pdf_lookup_dict(page_tree, "BleedBox")))) {
if (!rect_equal(tmp, bbox)) {
if (bbox)
pdf_release_obj(bbox);
bbox = tmp;
} else
pdf_release_obj(tmp);
}
if ((tmp = pdf_deref_obj(pdf_lookup_dict(page_tree, "TrimBox")))) {
if (!rect_equal(tmp, bbox)) {
if (bbox)
pdf_release_obj(bbox);
bbox = tmp;
} else
pdf_release_obj(tmp);
}
if ((tmp = pdf_deref_obj(pdf_lookup_dict(page_tree, "ArtBox")))) {
if (!rect_equal(tmp, bbox)) {
if (bbox)
pdf_release_obj(bbox);
bbox = tmp;
} else
pdf_release_obj(tmp);
}
if ((tmp = pdf_deref_obj(pdf_lookup_dict(page_tree, "CropBox")))) {
if (crop_box)
pdf_release_obj(crop_box);
crop_box = tmp;
}
}
if (crop_box) {
pdf_release_obj(bbox);
bbox = crop_box;
}
}
pdf_release_obj(page_tree);
if (!bbox) {
WARN("No BoundingBox information available.");
pdf_close(pf);
return -1;
}
*llx = (int)pdf_number_value(pdf_get_array(bbox, 0));
*lly = (int)pdf_number_value(pdf_get_array(bbox, 1));
*urx = (int)pdf_number_value(pdf_get_array(bbox, 2));
*ury = (int)pdf_number_value(pdf_get_array(bbox, 3));
pdf_release_obj(bbox);
pdf_close(pf);
return 0;
}
static void do_pdf (FILE *fp, char *filename)
{
int llx, lly, urx, ury;
if (pdf_get_info(fp, filename, &llx, &lly, &urx, &ury) < 0) {
fprintf (stderr, "%s does not look like a PDF file...\n", filename);
return;
}
write_xbb(filename, llx, lly, urx, ury);
return;
}
int extractbb (int argc, char *argv[], int mode)
{
xbb_output_mode = mode;
pdf_files_init();
pdf_set_version(5);
kpse_set_program_name(argv[0], NULL);
argc -= 1; argv += 1;
if (argc == 0)
usage();
while (argc > 0 && *argv[0] == '-') {
switch (*(argv[0]+1)) {
case 'b':
xbb_file_mode = FOPEN_WBIN_MODE;
argc -= 1; argv += 1;
break;
case 'm':
xbb_output_mode = EBB_OUTPUT;
argc -= 1; argv += 1;
break;
case 'x':
xbb_output_mode = XBB_OUTPUT;
argc -= 1; argv += 1;
break;
case 'v':
verbose = 1;
argc -= 1; argv += 1;
break;
case 'h':
usage();
argc -= 1; argv += 1;
break;
default:
usage();
}
}
for (; argc > 0; argc--, argv++) {
FILE *infile = NULL;
char *kpse_file_name;
if (!(kpse_file_name = kpse_find_pict(argv[0])) ||
(infile = MFOPEN(kpse_file_name, FOPEN_RBIN_MODE)) == NULL) {
fprintf(stderr, "Can't find file (%s)...skipping\n", argv[0]);
goto cont;
}
if (check_for_jpeg(infile)) {
do_jpeg(infile, kpse_file_name);
goto cont;
}
if (check_for_pdf(infile)) {
do_pdf(infile, kpse_file_name);
goto cont;
}
#ifdef HAVE_LIBPNG
if (check_for_png(infile)) {
do_png(infile, kpse_file_name);
goto cont;
}
#endif /* HAVE_LIBPNG */
fprintf(stderr, "Can't handle file type for file named %s\n", argv[0]);
cont:
if (kpse_file_name)
RELEASE(kpse_file_name);
if (infile)
MFCLOSE(infile);
}
pdf_files_close();
return 0;
}
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