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
124
125
126
127
128
129
130
131
132
|
/*
* This file contains support for System Use Sharing Protocol (SUSP) extension
* to ISO 9660.
*/
#include "inc.h"
#include <sys/stat.h>
#ifdef ISO9660_OPTION_ROCKRIDGE
int parse_susp(struct rrii_dir_record *dir, char *buffer)
{
/* Parse fundamental SUSP entries */
char susp_signature[2];
u8_t susp_length;
u8_t susp_version;
u32_t ca_block_nr;
u32_t ca_offset;
u32_t ca_length;
struct buf *ca_bp;
int r;
susp_signature[0] = buffer[0];
susp_signature[1] = buffer[1];
susp_length = *((u8_t*)buffer + 2);
susp_version = *((u8_t*)buffer + 3);
if ((susp_signature[0] == 'C') && (susp_signature[1] == 'E') &&
(susp_length >= 28) && (susp_version >= 1)) {
/*
* Continuation area, perform a recursion.
*
* FIXME: Currently we're parsing only first logical block of a
* continuation area, and infinite recursion is not checked.
*/
ca_block_nr = *((u32_t*)(buffer + 4));
ca_offset = *((u32_t*)(buffer + 12));
ca_length = *((u32_t*)(buffer + 20));
/* Truncate continuation area to fit one logical block. */
if (ca_offset >= v_pri.logical_block_size_l) {
return EINVAL;
}
if (ca_offset + ca_length > v_pri.logical_block_size_l) {
ca_length = v_pri.logical_block_size_l - ca_offset;
}
r = lmfs_get_block(&ca_bp, fs_dev, ca_block_nr, NORMAL);
if (r != OK)
return r;
parse_susp_buffer(dir, b_data(ca_bp) + ca_offset, ca_length);
lmfs_put_block(ca_bp);
return OK;
}
else if ((susp_signature[0] == 'P') && (susp_signature[1] == 'D')) {
/* Padding, skip. */
return OK;
}
else if ((susp_signature[0] == 'S') && (susp_signature[1] == 'P')) {
/* Ignored, skip. */
return OK;
}
else if ((susp_signature[0] == 'S') && (susp_signature[1] == 'T')) {
/* Terminator entry, stop processing. */
return(ECANCELED);
}
else if ((susp_signature[0] == 'E') && (susp_signature[1] == 'R')) {
/* Ignored, skip. */
return OK;
}
else if ((susp_signature[0] == 'E') && (susp_signature[1] == 'S')) {
/* Ignored, skip. */
return OK;
}
/* Not a SUSP fundamental entry. */
return EINVAL;
}
void parse_susp_buffer(struct rrii_dir_record *dir, char *buffer, u32_t size)
{
/*
* Parse a SUSP system use entry for the ISO 9660.
* This is the main entry point for parsing SUSP data : SUSP entries are
* routed from here to the relevant handling functions.
*/
char susp_signature[2];
u8_t susp_length;
int parser_return;
while (TRUE) {
/* A SUSP entry can't be smaller than 4 bytes. */
if (size < 4)
return;
susp_signature[0] = buffer[0];
susp_signature[1] = buffer[1];
susp_length = *((u8_t*)buffer + 2);
/* Check if SUSP entry is present. */
if (((susp_signature[0] == 0) && (susp_signature[1] == 0)) ||
(susp_length > size) || (susp_length < 4))
return;
/* Check for SUSP fundamental entry. */
parser_return = parse_susp(dir, buffer);
if (parser_return == ECANCELED)
return;
else if (parser_return == OK)
goto next_entry;
/* Check for Rock Ridge entry. */
if (opt.norock == FALSE) {
parser_return = parse_susp_rock_ridge(dir, buffer);
if (parser_return == ECANCELED)
return;
else if (parser_return == OK)
goto next_entry;
}
/* Parse next SUSP entry. */
next_entry:
buffer += susp_length;
size -= susp_length;
}
}
#endif
|
