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
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
|
/*
File: file_gsm.c
Copyright (C) 2014 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.
*/
#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"
#include "common.h"
#include "log.h"
#include "memmem.h"
static void register_header_check_gsm(file_stat_t *file_stat);
const file_hint_t file_hint_gsm= {
.extension="gsm",
.description="Group Speciale Mobile GSM 06.10",
.min_header_distance=0,
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=1,
.enable_by_default=0,
.register_header_check=®ister_header_check_gsm
};
struct block_header
{
unsigned char marker;
unsigned char payload[32];
} __attribute__ ((gcc_struct, __packed__));
static data_check_t data_check_gsm(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
{
while(file_recovery->calculated_file_size + buffer_size/2 >= file_recovery->file_size &&
file_recovery->calculated_file_size + sizeof(struct block_header) < file_recovery->file_size + buffer_size/2)
{
const unsigned int i=file_recovery->calculated_file_size - file_recovery->file_size + buffer_size/2;
const struct block_header *hdr=(const struct block_header *)&buffer[i];
if(hdr->marker < 0xd0 || hdr->marker > 0xdf)
return DC_STOP;
file_recovery->calculated_file_size+=sizeof(struct block_header);
}
return DC_CONTINUE;
}
static int header_check_gsm(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 block_header *hdr;
unsigned int i=0;
if(file_recovery->file_stat!=NULL
&& file_recovery->file_stat->file_hint==&file_hint_gsm)
return 0;
for(i=0, hdr=(const struct block_header *)buffer;
i * sizeof(struct block_header) < file_recovery_new->blocksize;
i++, hdr++)
{
if(hdr->marker < 0xd0 || hdr->marker > 0xdf)
return 0;
}
if(i<3)
return 0;
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_gsm.extension;
file_recovery_new->min_filesize=sizeof(struct block_header);
file_recovery_new->calculated_file_size=0;
file_recovery_new->data_check=&data_check_gsm;
file_recovery_new->file_check=&file_check_size;
return 1;
}
static void register_header_check_gsm(file_stat_t *file_stat)
{
static const unsigned char gsm_header1[1]={ 0xd0 };
static const unsigned char gsm_header2[1]={ 0xd1 };
static const unsigned char gsm_header3[1]={ 0xd2 };
static const unsigned char gsm_header4[1]={ 0xd3 };
static const unsigned char gsm_header5[1]={ 0xd4 };
static const unsigned char gsm_header6[1]={ 0xd5 };
static const unsigned char gsm_header7[1]={ 0xd6 };
static const unsigned char gsm_header8[1]={ 0xd7 };
static const unsigned char gsm_header9[1]={ 0xd8 };
static const unsigned char gsm_header10[1]={ 0xd9 };
static const unsigned char gsm_header11[1]={ 0xda };
static const unsigned char gsm_header12[1]={ 0xdb };
static const unsigned char gsm_header13[1]={ 0xdc };
static const unsigned char gsm_header14[1]={ 0xdd };
static const unsigned char gsm_header15[1]={ 0xde };
static const unsigned char gsm_header16[1]={ 0xdf };
register_header_check(0, gsm_header1, sizeof(gsm_header1), &header_check_gsm, file_stat);
register_header_check(0, gsm_header2, sizeof(gsm_header2), &header_check_gsm, file_stat);
register_header_check(0, gsm_header3, sizeof(gsm_header3), &header_check_gsm, file_stat);
register_header_check(0, gsm_header4, sizeof(gsm_header4), &header_check_gsm, file_stat);
register_header_check(0, gsm_header5, sizeof(gsm_header5), &header_check_gsm, file_stat);
register_header_check(0, gsm_header6, sizeof(gsm_header6), &header_check_gsm, file_stat);
register_header_check(0, gsm_header7, sizeof(gsm_header7), &header_check_gsm, file_stat);
register_header_check(0, gsm_header8, sizeof(gsm_header8), &header_check_gsm, file_stat);
register_header_check(0, gsm_header9, sizeof(gsm_header9), &header_check_gsm, file_stat);
register_header_check(0, gsm_header10, sizeof(gsm_header10), &header_check_gsm, file_stat);
register_header_check(0, gsm_header11, sizeof(gsm_header11), &header_check_gsm, file_stat);
register_header_check(0, gsm_header12, sizeof(gsm_header12), &header_check_gsm, file_stat);
register_header_check(0, gsm_header13, sizeof(gsm_header13), &header_check_gsm, file_stat);
register_header_check(0, gsm_header14, sizeof(gsm_header14), &header_check_gsm, file_stat);
register_header_check(0, gsm_header15, sizeof(gsm_header15), &header_check_gsm, file_stat);
register_header_check(0, gsm_header16, sizeof(gsm_header16), &header_check_gsm, file_stat);
}
|
