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/* $Header$
This is dvipdfm, a DVI to PDF translator.
Copyright (C) 1998, 1999 by Mark A. Wicks
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
The author may be contacted via the e-mail address
mwicks@kettering.edu
*/
#include <stdio.h>
#include <stdlib.h>
#include <kpathsea/config.h>
#include <kpathsea/c-ctype.h>
#include "system.h"
#include "config.h"
#include "mfileio.h"
#include "mem.h"
#include "pdfobj.h"
#include "thumbnail.h"
#ifdef HAVE_LIBPNG
#include <png.h>
#include "pngimage.h"
#define TMP "/tmp"
static char *guess_name (const char *thumb_filename)
{
/* Build path name for anticipated thumbnail image */
char *tmpdir, *tmpname;
if (!(tmpdir = getenv ("TMPDIR")) &&
!(tmpdir = getenv ("TEMP")) &&
!(tmpdir = getenv ("TMP")))
tmpdir = TMP;
tmpname = NEW (strlen(tmpdir)+strlen(thumb_filename)+strlen(DIR_SEP_STRING)+1,
char);
strcpy (tmpname, tmpdir);
if (!IS_DIR_SEP (tmpname[strlen(tmpname)-1])) {
strcat (tmpname, DIR_SEP_STRING);
}
strcat (tmpname, thumb_filename);
return tmpname;
}
static char thumbnail_remove_opt = 0;
void thumb_remove(void)
{
thumbnail_remove_opt = 1;
}
static unsigned char sigbytes[4];
pdf_obj *do_thumbnail (const char *thumb_filename)
{
pdf_obj *image_stream = NULL, *image_ref = NULL;
int found_in_cwd = 0;
FILE *thumb_file;
char *guess_filename = NULL;
guess_filename = guess_name (thumb_filename);
if ((thumb_file = MFOPEN (thumb_filename, FOPEN_RBIN_MODE))) {
found_in_cwd = 1;
} else if (!(thumb_file = MFOPEN (guess_filename, FOPEN_RBIN_MODE))) {
fprintf (stderr, "\nNo thumbnail file\n");
return NULL;
}
if (fread (sigbytes, 1, sizeof(sigbytes), thumb_file) !=
sizeof(sigbytes) ||
(!png_check_sig (sigbytes, sizeof(sigbytes)))) {
fprintf (stderr, "\nThumbnail not a png file! Skipping\n");
return NULL;
}
rewind (thumb_file);
if ((image_stream = start_png_image (thumb_file, NULL))) {
image_ref = pdf_ref_obj (image_stream);
pdf_release_obj (image_stream);
} else {
image_ref = NULL;
}
if (thumbnail_remove_opt && found_in_cwd)
remove (thumb_filename);
else if (thumbnail_remove_opt)
remove (guess_filename);
if (guess_filename)
RELEASE (guess_filename);
MFCLOSE (thumb_file);
return image_ref;
}
#endif /* HAVE_LIBPNG */
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