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/*
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"
/*@ requires valid_register_header_check(file_stat); */
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
};
/*@
@ requires buffer_size >= 0x15;
@ requires separation: \separated(&file_hint_dvi, buffer+(..), file_recovery, file_recovery_new);
@ requires valid_header_check_param(buffer, buffer_size, safe_header_only, file_recovery, file_recovery_new);
@ ensures valid_header_check_result(\result, file_recovery_new);
@ assigns *file_recovery_new;
@*/
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=0x15+buffer[0x14];
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
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