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
|
/*
File: file_class.c
Copyright (C) 2009 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_class)
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <stdio.h>
#include "types.h"
#include "common.h"
#include "filegen.h"
/*@ requires valid_register_header_check(file_stat); */
static void register_header_check_class(file_stat_t *file_stat);
const file_hint_t file_hint_class= {
.extension="class",
.description="Java Class",
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=1,
.enable_by_default=1,
.register_header_check=®ister_header_check_class
};
struct class_header {
uint32_t magic_number;
uint16_t minor_version;
uint16_t major_version;
uint16_t constant_pool_count;
};
/*@
@ requires buffer_size >= sizeof(struct class_header);
@ requires separation: \separated(&file_hint_class, 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_class(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)
{
const struct class_header *cafe=(const struct class_header *)buffer;
if(be32(cafe->magic_number)==0xCafeBabe &&
be16(cafe->major_version) >= 45 && be16(cafe->major_version) <= 100 &&
be16(cafe->constant_pool_count) > 0)
{
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_class.extension;
return 1;
}
return 0;
}
static void register_header_check_class(file_stat_t *file_stat)
{
/* https://en.wikipedia.org/wiki/Class_(file_format) */
static const unsigned char class_magic[4]= { 0xCA, 0xFE, 0xBA, 0xBE };
register_header_check(0, class_magic, sizeof(class_magic), &header_check_class, file_stat);
}
#endif
|
