1 /*
2
3 File: file_nes.c
4
5 Copyright (C) 2013 James Holodnak <jamesholodnak@gmail.com>
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 #include "common.h"
33
34 static void register_header_check_nes(file_stat_t *file_stat);
35
36 const file_hint_t file_hint_nes= {
37 .extension="nes",
38 .description="iNES/iNES 2.0 ROM image",
39 .max_filesize=PHOTOREC_MAX_FILE_SIZE,
40 .recover=1,
41 .enable_by_default=0,
42 .register_header_check=®ister_header_check_nes
43 };
44
45 struct nes_header
46 {
47 char ident[4];
48 uint8_t prgsize;
49 uint8_t chrsize;
50 } __attribute__ ((gcc_struct, __packed__));
51
header_check_nes(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)52 static int header_check_nes(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)
53 {
54 const struct nes_header *bm=(const struct nes_header *)buffer;
55 const uint64_t size=16+bm->prgsize*0x4000+bm->chrsize*0x2000;
56 reset_file_recovery(file_recovery_new);
57 file_recovery_new->extension=file_hint_nes.extension;
58 file_recovery_new->min_filesize=16;
59 file_recovery_new->calculated_file_size=(uint64_t)size;
60 file_recovery_new->data_check=&data_check_size;
61 file_recovery_new->file_check=&file_check_size;
62 return 1;
63 }
64
register_header_check_nes(file_stat_t * file_stat)65 static void register_header_check_nes(file_stat_t *file_stat)
66 {
67 static const unsigned char nes_header[4]= {'N','E','S',0x1A};
68 register_header_check(0, nes_header,sizeof(nes_header), &header_check_nes, file_stat);
69 }
70