1 /*
2
3 File: file_pct.c
4
5 Copyright (C) 2008 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 #ifdef HAVE_CONFIG_H
23 #include <config.h>
24 #endif
25 #ifdef HAVE_STRING_H
26 #include <string.h>
27 #endif
28 #include <stdio.h>
29 #include "types.h"
30 #include "filegen.h"
31 #include "common.h"
32 #include "log.h"
33
34 extern const file_hint_t file_hint_indd;
35 static void register_header_check_pct(file_stat_t *file_stat);
36 static int header_check_pct(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);
37 static void file_check_pct(file_recovery_t *file_recovery);
38
39 const file_hint_t file_hint_pct= {
40 .extension="pct",
41 .description="Macintosh Picture",
42 .max_filesize=PHOTOREC_MAX_FILE_SIZE,
43 .recover=1,
44 .enable_by_default=1,
45 .register_header_check=®ister_header_check_pct
46 };
47
48 /* We are searching for PICTv2 files
49 http://www.fileformat.info/format/macpict/
50 SHORT Version operator (0x0011)
51 SHORT Version number (0x02ff)
52 SHORT Header opcode for Version 2 (0C00)
53 */
54
55 struct pct_file_entry {
56 uint16_t filesize; /* 0x00 */
57 uint16_t XMin; /* 0x02 72 DPI */
58 uint16_t YMin; /* 0x04 */
59 uint16_t XMax; /* 0x06 */
60 uint16_t YMax; /* 0x08 */
61 uint16_t VersionOperator; /* 0x0A 0x0011 */
62 uint16_t VersionNumber; /* 0x0C 0x02ff */
63 uint16_t HeaderOpcode; /* 0x0E 0x0C00 */
64 uint16_t Val; /* 0x10 0xFFEF or 0xFFEE */
65 uint16_t Reserved; /* 0x12 0x0000 */
66 uint32_t HDPI; /* 0x14 */
67 uint32_t VDPI; /* 0x18 */
68 #if 0
69 uint16_t OYMax; // pbmplus format
70 uint16_t OYMin;
71 uint16_t OXMax;
72 uint16_t OXMin;
73 #else
74 uint16_t OXMin;
75 uint16_t OYMin;
76 uint16_t OXMax;
77 uint16_t OYMax;
78 #endif
79 uint32_t Reserved2; /* 0x24 */
80 } __attribute__ ((gcc_struct, __packed__));
81
header_check_pct(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)82 static int header_check_pct(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)
83 {
84 const struct pct_file_entry *pct=(const struct pct_file_entry *)(&buffer[0x200]);
85 if(be16(pct->XMin) <= be16(pct->XMax) &&
86 be16(pct->YMin) <= be16(pct->YMax) &&
87 ((be16(pct->OXMin) <= be16(pct->OXMax) &&
88 be16(pct->OYMin) <= be16(pct->OYMax)) ||
89 (be16(pct->OYMax) <= be16(pct->OXMax) && /* pbmplus creates boggus files */
90 be16(pct->OYMin) <= be16(pct->OXMin))) &&
91 be16(pct->XMin)==0 && /* Reject some valid but uncommon files */
92 be16(pct->YMin)==0 &&
93 be16(pct->OYMin)==0 &&
94 be16(pct->VersionOperator)==0x0011 &&
95 be16(pct->VersionNumber)==0x02ff)
96 {
97 if(file_recovery->file_stat != NULL &&
98 file_recovery->file_stat->file_hint==&file_hint_indd)
99 {
100 if(header_ignored_adv(file_recovery, file_recovery_new)==0)
101 return 0;
102 }
103 reset_file_recovery(file_recovery_new);
104 file_recovery_new->extension=file_hint_pct.extension;
105 /* We only have the low 16bits of the filesystem */
106 file_recovery_new->min_filesize=(buffer[0x200]<<8)+buffer[0x201];
107 file_recovery_new->file_check=&file_check_pct;
108 #ifdef DEBUG_PCT
109 log_info("X %u-%u, Y %u-%u\n",
110 be16(pct->XMin), be16(pct->XMax),
111 be16(pct->YMin), be16(pct->YMax));
112 log_info("X %u-%u, Y %u-%u\n",
113 be16(pct->OXMin), be16(pct->OXMax),
114 be16(pct->OYMin), be16(pct->OYMax));
115 #endif
116 return 1;
117 }
118 return 0;
119 }
120
file_check_pct(file_recovery_t * file_recovery)121 static void file_check_pct(file_recovery_t *file_recovery)
122 {
123 if(file_recovery->file_size<0x210 ||
124 file_recovery->file_size<file_recovery->min_filesize)
125 {
126 file_recovery->file_size=0;
127 return ;
128 }
129 file_recovery->file_size-=((file_recovery->file_size-file_recovery->min_filesize)&0xFFFF);
130 }
131
register_header_check_pct(file_stat_t * file_stat)132 static void register_header_check_pct(file_stat_t *file_stat)
133 {
134 static const unsigned char pct_header[6]= { 0x00, 0x11, 0x02, 0xff, 0x0c, 0x00};
135 register_header_check(0x20a, pct_header,sizeof(pct_header), &header_check_pct, file_stat);
136 }
137