1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
/*
File: file_xz.c
Copyright (C) 2012 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_xz)
#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_xz(file_stat_t *file_stat);
const file_hint_t file_hint_xz = {
.extension = "xz",
.description = "xz Archive",
.max_filesize = PHOTOREC_MAX_FILE_SIZE,
.recover = 1,
.enable_by_default = 1,
.register_header_check = ®ister_header_check_xz
};
/*@
@ requires file_recovery->file_check == &file_check_xz;
@ requires valid_file_check_param(file_recovery);
@ ensures valid_file_check_result(file_recovery);
@ assigns *file_recovery->handle, errno, file_recovery->file_size;
@ assigns Frama_C_entropy_source;
@*/
static void file_check_xz(file_recovery_t *file_recovery)
{
const unsigned char xz_footer[2] = { 'Y', 'Z' };
file_search_footer(file_recovery, xz_footer, sizeof(xz_footer), 0);
}
/*@
@ requires separation: \separated(&file_hint_xz, 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_xz(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_xz.extension;
file_recovery_new->file_check = &file_check_xz;
file_recovery_new->min_filesize = 9;
return 1;
}
static void register_header_check_xz(file_stat_t *file_stat)
{
/* https://tukaani.org/xz/xz-file-format.txt */
/* HEADER_MAGIC + Stream Flag[0] */
static const unsigned char xz_header[7] = {
0xfd, '7', 'z', 'X', 'Z', 0x00, 0x00
};
register_header_check(0, xz_header, sizeof(xz_header), &header_check_xz, file_stat);
}
#endif
|
