summaryrefslogtreecommitdiffstats
path: root/src/file_r3d.c
blob: 3d73e541358eae637d117bf9a3b9ace67e7bf119 (plain)
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
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
/*

    File: file_r3d.c

    Copyright (C) 2009,2014 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.

 */

#if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_r3d)
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <stdio.h>
#include <ctype.h>
#include "types.h"
#include "filegen.h"
#include "common.h"
#include "log.h"

/*@ requires \valid(file_stat); */
static void register_header_check_r3d(file_stat_t *file_stat);

const file_hint_t file_hint_r3d = {
  .extension = "r3d",
  .description = "RED r3d camera",
  .max_filesize = PHOTOREC_MAX_FILE_SIZE,
  .recover = 1,
  .enable_by_default = 1,
  .register_header_check = &register_header_check_r3d
};

struct atom_struct
{
  uint32_t size;
  uint32_t type;
} __attribute__((gcc_struct, __packed__));

/*@
  @ requires buffer_size > 0;
  @ requires (buffer_size&1)==0;
  @ requires \valid_read(buffer+(0..buffer_size-1));
  @ requires \valid(file_recovery);
  @ requires file_recovery->data_check==&data_check_r3d;
  @ requires \separated(buffer + (..), file_recovery);
  @ ensures \result == DC_CONTINUE || \result == DC_STOP;
  @ assigns file_recovery->calculated_file_size, file_recovery->data_check;
  @*/
static data_check_t data_check_r3d(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
{
  /*@
    @ loop assigns file_recovery->calculated_file_size;
    @*/
  while(file_recovery->calculated_file_size + buffer_size / 2 >= file_recovery->file_size && file_recovery->calculated_file_size + 8 <= file_recovery->file_size + buffer_size / 2)
  {
    const unsigned int i = file_recovery->calculated_file_size + buffer_size / 2 - file_recovery->file_size;
    /*@ assert 0 <= i <= buffer_size-8; */
    const struct atom_struct *atom = (const struct atom_struct *)&buffer[i];
    uint64_t atom_size = be32(atom->size);
    if(atom_size < 8)
      return DC_STOP;
#ifdef DEBUG_R3D
    log_trace("file_r3d.c: %s atom %c%c%c%c (0x%02x%02x%02x%02x) size %llu, calculated_file_size %llu\n",
              file_recovery->filename,
              buffer[i + 4], buffer[i + 5], buffer[i + 6], buffer[i + 7],
              buffer[i + 4], buffer[i + 5], buffer[i + 6], buffer[i + 7],
              (long long unsigned)atom_size,
              (long long unsigned)file_recovery->calculated_file_size);
#endif
    if(buffer[i + 4] == 'R' && buffer[i + 5] == 'E' && buffer[i + 6] == 'O')
    {
      /* End of file */
      file_recovery->calculated_file_size += atom_size;
      file_recovery->data_check = NULL;
      return DC_CONTINUE;
    }
    if(buffer[i + 4] != 'R')
    {
      return DC_STOP;
    }
    /* REDV1 REDV RPAD RDVO RDVS RDAO RDAS REOB */
    file_recovery->calculated_file_size += atom_size;
  }
#ifdef DEBUG_R3D
  log_trace("file_r3d.c: new calculated_file_size %llu\n",
            (long long unsigned)file_recovery->calculated_file_size);
#endif
  return DC_CONTINUE;
}

/*@
  @ requires \valid(file_recovery);
  @ requires valid_file_recovery(file_recovery);
  @ requires file_recovery->file_rename==&file_rename_r3d;
  @*/
static void file_rename_r3d(file_recovery_t *file_recovery)
{
  unsigned char buffer[512];
  FILE *file;
  size_t buffer_size;
  unsigned int i;
  if((file = fopen(file_recovery->filename, "rb")) == NULL)
    return;
  buffer_size = fread(buffer, 1, sizeof(buffer), file);
  fclose(file);
  if(buffer_size < 0x44)
    return;
  /*@ loop assigns i; */
  for(i = 0x43; i < buffer_size && buffer[i] != 0 && buffer[i] != '.'; i++)
  {
    if(!isalnum(buffer[i]) && buffer[i] != '_')
      return;
  }
  file_rename(file_recovery, buffer, i, 0x43, NULL, 1);
}

/*@
  @ requires buffer_size >= sizeof(struct atom_struct);
  @ requires \valid_read(buffer+(0..buffer_size-1));
  @ requires valid_file_recovery(file_recovery);
  @ requires \valid(file_recovery_new);
  @ requires file_recovery_new->blocksize > 0;
  @ requires separation: \separated(&file_hint_r3d, buffer+(..), file_recovery, file_recovery_new);
  @ ensures \result == 0 || \result == 1;
  @ ensures  \result!=0 ==> valid_file_recovery(file_recovery_new);
  @ assigns  *file_recovery_new;
  @*/
static int header_check_r3d(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 atom_struct *atom = (const struct atom_struct *)buffer;
  if(be32(atom->size) < 8)
    return 0;
  if(buffer[0xa] == 'R' && buffer[0xb] == '1')
  {
    reset_file_recovery(file_recovery_new);
    file_recovery_new->extension = file_hint_r3d.extension;
    file_recovery_new->file_rename = &file_rename_r3d;
    if(file_recovery_new->blocksize < 8)
      return 1;
    file_recovery_new->data_check = &data_check_r3d;
    file_recovery_new->file_check = &file_check_size;
    return 1;
  }
  return 0;
}

/*@
  @ requires buffer_size >= 0xc;
  @ requires \valid_read(buffer+(0..buffer_size-1));
  @ requires valid_file_recovery(file_recovery);
  @ requires \valid(file_recovery_new);
  @ requires file_recovery_new->blocksize > 0;
  @ requires separation: \separated(&file_hint_r3d, buffer+(..), file_recovery, file_recovery_new);
  @ ensures \result == 0 || \result == 1;
  @ ensures  \result!=0 ==> valid_file_recovery(file_recovery_new);
  @ assigns  *file_recovery_new;
  @*/
static int header_check_r3d_v2(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)
{
  if(buffer[0xa] == 'R' && buffer[0xb] == '2')
  {
    reset_file_recovery(file_recovery_new);
    file_recovery_new->extension = file_hint_r3d.extension;
    return 1;
  }
  return 0;
}

static void register_header_check_r3d(file_stat_t *file_stat)
{
  static const unsigned char r3d_header1[4] = { 'R', 'E', 'D', '1' };
  static const unsigned char r3d_header2[4] = { 'R', 'E', 'D', '2' };
  register_header_check(4, r3d_header1, sizeof(r3d_header1), &header_check_r3d, file_stat);
  register_header_check(4, r3d_header2, sizeof(r3d_header2), &header_check_r3d_v2, file_stat);
}
#endif