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
|
/*
* Extract component parts of MS CHM files
*
* Copyright (C) 2015 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
* Copyright (C) 2007-2008 Sourcefire, Inc.
*
* Authors: Trog
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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 to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
#ifndef __CHM_UNPACK_H
#define __CHM_UNPACK_H
#if HAVE_CONFIG_H
#include "clamav-config.h"
#endif
#include "cltypes.h"
#include "others.h"
#include "fmap.h"
#ifndef HAVE_ATTRIB_PACKED
#define __attribute__(x)
#endif
#ifdef HAVE_PRAGMA_PACK
#pragma pack(1)
#endif
#ifdef HAVE_PRAGMA_PACK_HPPA
#pragma pack 1
#endif
#define CHM_ITSF_MIN_LEN (0x60)
typedef struct chm_itsf_header_tag
{
unsigned char signature[4];
int32_t version __attribute__ ((packed));
int32_t header_len __attribute__ ((packed));
uint32_t unknown __attribute__ ((packed));
uint32_t last_modified __attribute__ ((packed));
uint32_t lang_id __attribute__ ((packed));
unsigned char dir_clsid[16];
unsigned char stream_clsid[16];
uint64_t sec0_offset __attribute__ ((packed));
uint64_t sec0_len __attribute__ ((packed));
uint64_t dir_offset __attribute__ ((packed));
uint64_t dir_len __attribute__ ((packed));
uint64_t data_offset __attribute__ ((packed));
} chm_itsf_header_t;
#define CHM_ITSP_LEN (0x54)
typedef struct chm_itsp_header_tag
{
unsigned char signature[4];
int32_t version __attribute__ ((packed));
int32_t header_len __attribute__ ((packed));
int32_t unknown1 __attribute__ ((packed));
uint32_t block_len __attribute__ ((packed));
int32_t blockidx_intvl __attribute__ ((packed));
int32_t index_depth __attribute__ ((packed));
int32_t index_root __attribute__ ((packed));
int32_t index_head __attribute__ ((packed));
int32_t index_tail __attribute__ ((packed));
int32_t unknown2 __attribute__ ((packed));
uint32_t num_blocks __attribute__ ((packed));
uint32_t lang_id __attribute__ ((packed));
unsigned char system_clsid[16];
unsigned char unknown4[16];
} chm_itsp_header_t;
#ifdef HAVE_PRAGMA_PACK
#pragma pack()
#endif
#ifdef HAVE_PRAGMA_PACK_HPPA
#pragma pack
#endif
typedef struct chm_sys_entry_tag
{
uint64_t offset;
uint64_t length;
} chm_sys_entry_t;
typedef struct chm_metadata_tag {
uint64_t file_length;
uint64_t file_offset;
chm_sys_entry_t sys_control;
chm_sys_entry_t sys_content;
chm_sys_entry_t sys_reset;
off_t m_length;
chm_itsf_header_t itsf_hdr;
chm_itsp_header_t itsp_hdr;
int ufd;
int ofd;
uint32_t num_chunks;
off_t chunk_offset;
const char *chunk_data;
const char *chunk_current;
const char *chunk_end;
fmap_t *map;
uint16_t chunk_entries;
} chm_metadata_t;
int cli_chm_open(const char *dirname, chm_metadata_t *metadata, cli_ctx *ctx);
int cli_chm_prepare_file(chm_metadata_t *metadata);
int cli_chm_extract_file(char *dirname, chm_metadata_t *metadata, cli_ctx *ctx);
void cli_chm_close(chm_metadata_t *metadata);
#endif
|
