1 /*
2
3 File: file_bvr.c
4
5 Copyright (C) 2018 Christophe GRENIER <grenier@cgsecurity.org>
6
7 This software is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License along
18 with this program; if not, write the Free Software Foundation, Inc., 51
19 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20
21 */
22
23 #ifdef HAVE_CONFIG_H
24 #include <config.h>
25 #endif
26 #ifdef HAVE_STRING_H
27 #include <string.h>
28 #endif
29 #include <stdio.h>
30 #include "types.h"
31 #include "filegen.h"
32
33 static void register_header_check_bvr(file_stat_t *file_stat);
34
35 const file_hint_t file_hint_bvr= {
36 .extension="bvr",
37 .description="Blue Iris DVR",
38 .max_filesize=PHOTOREC_MAX_FILE_SIZE,
39 .recover=1,
40 .enable_by_default=1,
41 .register_header_check=®ister_header_check_bvr
42 };
43
data_check_bvr(const unsigned char * buffer,const unsigned int buffer_size,file_recovery_t * file_recovery)44 static data_check_t data_check_bvr(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
45 {
46 while(file_recovery->calculated_file_size + buffer_size/2 >= file_recovery->file_size &&
47 file_recovery->calculated_file_size + 16 < file_recovery->file_size + buffer_size/2)
48 {
49 const unsigned int i=file_recovery->calculated_file_size - file_recovery->file_size + buffer_size/2;
50 const uint32_t *valp=(const uint32_t *)&buffer[i+12];
51 if(memcmp(&buffer[i], "BLUE", 4) != 0)
52 return DC_STOP;
53 file_recovery->calculated_file_size+=0x20 + *valp;
54 if(*valp == 0)
55 return DC_STOP;
56 }
57 return DC_CONTINUE;
58 }
59
header_check_bvr(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)60 static int header_check_bvr(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)
61 {
62 if(file_recovery->file_stat!=NULL &&
63 file_recovery->file_stat->file_hint==&file_hint_bvr)
64 {
65 header_ignored(file_recovery_new);
66 return 0;
67 }
68 reset_file_recovery(file_recovery_new);
69 file_recovery_new->extension=file_hint_bvr.extension;
70 file_recovery_new->data_check=&data_check_bvr;
71 file_recovery_new->file_check=&file_check_size;
72 return 1;
73 }
74
register_header_check_bvr(file_stat_t * file_stat)75 static void register_header_check_bvr(file_stat_t *file_stat)
76 {
77 static const unsigned char bvrheader[8]= { 'B', 'L', 'U', 'E', 0x20, 0x00, 0x10, 0x00};
78 register_header_check(0, bvrheader, sizeof(bvrheader), &header_check_bvr, file_stat);
79 }
80