69 lines
2.3 KiB
C
69 lines
2.3 KiB
C
/*
|
|
|
|
File: file_dvi.c
|
|
|
|
Copyright (C) 2016 Christophe GRENIER <grenier@cgsecurity.org>
|
|
|
|
This software 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 the Free Software Foundation, Inc., 51
|
|
Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
|
|
*/
|
|
|
|
#if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_dvi)
|
|
#ifdef HAVE_CONFIG_H
|
|
#include <config.h>
|
|
#endif
|
|
#ifdef HAVE_STRING_H
|
|
#include <string.h>
|
|
#endif
|
|
#include <stdio.h>
|
|
#include "types.h"
|
|
#include "filegen.h"
|
|
|
|
static void register_header_check_dvi(file_stat_t *file_stat);
|
|
|
|
const file_hint_t file_hint_dvi= {
|
|
.extension="dvi",
|
|
.description="TeX DVI",
|
|
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
|
|
.recover=1,
|
|
.enable_by_default=1,
|
|
.register_header_check=®ister_header_check_dvi
|
|
};
|
|
|
|
static int header_check_dvi(const unsigned char *buffer, const unsigned int buffer_size, const unsigned int safe_header_only, const file_recovery_t *file_recovery, file_recovery_t *file_recovery_new)
|
|
{
|
|
reset_file_recovery(file_recovery_new);
|
|
file_recovery_new->extension=file_hint_dvi.extension;
|
|
file_recovery_new->min_filesize=15+buffer[0x14]; /* 15 + comment size */
|
|
return 1;
|
|
}
|
|
|
|
static void register_header_check_dvi(file_stat_t *file_stat)
|
|
{
|
|
static const unsigned char dvi_header[12]= {
|
|
0xf7, // pre
|
|
0x02, // version 2
|
|
// There are exactly 7227 TeX points in 254 centimeters,
|
|
// and TeX82 works with scaled points where there are 2^16 sp in a point,
|
|
// so TeX82 sets the following values
|
|
0x01, 0x83, 0x92, 0xc0, // num=0x018392c0=25400000
|
|
0x1c, 0x3b, 0x00, 0x00, // den=0x1c3b0000=7227*2^16=473628672
|
|
// mag
|
|
// comment size
|
|
// comment
|
|
};
|
|
register_header_check(0, dvi_header, sizeof(dvi_header), &header_check_dvi, file_stat);
|
|
}
|
|
#endif
|