1 /*
2
3 File: file_au.c
4
5 Copyright (C) 1998-2005,2007 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 "common.h"
32 #include "filegen.h"
33
34 static void register_header_check_au(file_stat_t *file_stat);
35
36 const file_hint_t file_hint_au= {
37 .extension="au",
38 .description="Sun/NeXT audio data",
39 .max_filesize=PHOTOREC_MAX_FILE_SIZE,
40 .recover=1,
41 .enable_by_default=1,
42 .register_header_check=®ister_header_check_au
43 };
44
45 /* http://en.wikipedia.org/wiki/Au_file_format */
46 struct header_au_s
47 {
48 uint32_t magic;
49 uint32_t offset;
50 uint32_t size;
51 uint32_t encoding;
52 uint32_t sample_rate;
53 uint32_t channels;
54 } __attribute__ ((gcc_struct, __packed__));
55
header_check_au(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)56 static int header_check_au(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)
57 {
58 const struct header_au_s *au=(const struct header_au_s *)buffer;
59 if((const uint32_t)be32(au->offset) >= sizeof(struct header_au_s) &&
60 be32(au->encoding)>0 && be32(au->encoding)<=27 &&
61 be32(au->channels)>0 && be32(au->channels)<=256)
62 {
63 if(be32(au->size)!=0xffffffff)
64 {
65 if(be32(au->offset)+be32(au->size) < 111)
66 return 0;
67 reset_file_recovery(file_recovery_new);
68 file_recovery_new->min_filesize=111;
69 file_recovery_new->extension=file_hint_au.extension;
70 file_recovery_new->calculated_file_size=(uint64_t)be32(au->offset)+be32(au->size);
71 file_recovery_new->data_check=&data_check_size;
72 file_recovery_new->file_check=&file_check_size;
73 return 1;
74 }
75 reset_file_recovery(file_recovery_new);
76 file_recovery_new->min_filesize=111;
77 file_recovery_new->extension=file_hint_au.extension;
78 return 1;
79 }
80 return 0;
81 }
82
register_header_check_au(file_stat_t * file_stat)83 static void register_header_check_au(file_stat_t *file_stat)
84 {
85 static const unsigned char au_header[4]= {'.','s','n','d'};
86 register_header_check(0, au_header,sizeof(au_header), &header_check_au, file_stat);
87 }
88