1 /*
2
3 File: file_woff.c
4
5 Copyright (C) 2014 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 #include "common.h"
33
34 static void register_header_check_woff(file_stat_t *file_stat);
35
36 const file_hint_t file_hint_woff= {
37 .extension="woff",
38 .description="Web Open Font Format",
39 .max_filesize=PHOTOREC_MAX_FILE_SIZE,
40 .recover=1,
41 .enable_by_default=1,
42 .register_header_check=®ister_header_check_woff
43 };
44
45 struct WOFFHeader
46 {
47 uint32_t signature;
48 uint32_t flavor;
49 uint32_t length;
50 uint16_t numTables;
51 uint16_t reserved;
52 uint32_t totalSfntSize;
53 uint16_t majorVersion;
54 uint16_t minorVersion;
55 uint32_t metaOffset;
56 uint32_t metaLength;
57 uint32_t metaOrigLength;
58 uint32_t privOffset;
59 uint32_t privLength;
60 } __attribute__ ((gcc_struct, __packed__));
61
header_check_woff(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)62 static int header_check_woff(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)
63 {
64 const struct WOFFHeader *woff=(const struct WOFFHeader *)buffer;
65 const uint64_t length=(uint64_t)be32(woff->length);
66 if((uint32_t)be32(woff->length) < sizeof(struct WOFFHeader))
67 return 0;
68 if((uint32_t)be32(woff->metaOffset) > 0 && (uint32_t)be32(woff->metaOffset) < sizeof(struct WOFFHeader))
69 return 0;
70 if((uint32_t)be32(woff->privOffset) > 0 && (uint32_t)be32(woff->privOffset) < sizeof(struct WOFFHeader))
71 return 0;
72 if((uint64_t)be32(woff->metaOffset) + (uint64_t)be32(woff->metaLength) > length ||
73 (uint64_t)be32(woff->privOffset) + (uint64_t)be32(woff->privLength) > length)
74 return 0;
75 if(woff->reserved!=0)
76 return 0;
77 reset_file_recovery(file_recovery_new);
78 file_recovery_new->extension=file_hint_woff.extension;
79 file_recovery_new->calculated_file_size=length;
80 file_recovery_new->data_check=&data_check_size;
81 file_recovery_new->file_check=&file_check_size;
82 return 1;
83 }
84
register_header_check_woff(file_stat_t * file_stat)85 static void register_header_check_woff(file_stat_t *file_stat)
86 {
87 register_header_check(0, "wOFF", 4, &header_check_woff, file_stat);
88 }
89