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
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
|
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/* dbus-marshal-byteswap.c Swap a block of marshaled data
*
* Copyright (C) 2005 Red Hat, Inc.
*
* Licensed under the Academic Free License version 2.1
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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
*
*/
#include <config.h>
#include "dbus-marshal-byteswap.h"
#include "dbus-marshal-basic.h"
#include "dbus-signature.h"
/**
* @addtogroup DBusMarshal
* @{
*/
static void
byteswap_body_helper (DBusTypeReader *reader,
dbus_bool_t walk_reader_to_end,
int old_byte_order,
int new_byte_order,
unsigned char *p,
unsigned char **new_p)
{
int current_type;
while ((current_type = _dbus_type_reader_get_current_type (reader)) != DBUS_TYPE_INVALID)
{
switch (current_type)
{
case DBUS_TYPE_BYTE:
++p;
break;
case DBUS_TYPE_INT16:
case DBUS_TYPE_UINT16:
{
p = _DBUS_ALIGN_ADDRESS (p, 2);
*((dbus_uint16_t*)p) = DBUS_UINT16_SWAP_LE_BE (*((dbus_uint16_t*)p));
p += 2;
}
break;
case DBUS_TYPE_BOOLEAN:
case DBUS_TYPE_INT32:
case DBUS_TYPE_UINT32:
{
p = _DBUS_ALIGN_ADDRESS (p, 4);
*((dbus_uint32_t*)p) = DBUS_UINT32_SWAP_LE_BE (*((dbus_uint32_t*)p));
p += 4;
}
break;
case DBUS_TYPE_INT64:
case DBUS_TYPE_UINT64:
case DBUS_TYPE_DOUBLE:
{
p = _DBUS_ALIGN_ADDRESS (p, 8);
#ifdef DBUS_HAVE_INT64
*((dbus_uint64_t*)p) = DBUS_UINT64_SWAP_LE_BE (*((dbus_uint64_t*)p));
#else
_dbus_swap_array (p, 1, 8);
#endif
p += 8;
}
break;
case DBUS_TYPE_ARRAY:
case DBUS_TYPE_STRING:
case DBUS_TYPE_OBJECT_PATH:
{
dbus_uint32_t array_len;
p = _DBUS_ALIGN_ADDRESS (p, 4);
array_len = _dbus_unpack_uint32 (old_byte_order, p);
*((dbus_uint32_t*)p) = DBUS_UINT32_SWAP_LE_BE (*((dbus_uint32_t*)p));
p += 4;
if (current_type == DBUS_TYPE_ARRAY)
{
int elem_type;
int alignment;
elem_type = _dbus_type_reader_get_element_type (reader);
alignment = _dbus_type_get_alignment (elem_type);
_dbus_assert ((array_len / alignment) < DBUS_MAXIMUM_ARRAY_LENGTH);
p = _DBUS_ALIGN_ADDRESS (p, alignment);
if (dbus_type_is_fixed (elem_type))
{
if (alignment > 1)
_dbus_swap_array (p, array_len / alignment, alignment);
p += array_len;
}
else
{
DBusTypeReader sub;
const unsigned char *array_end;
array_end = p + array_len;
_dbus_type_reader_recurse (reader, &sub);
while (p < array_end)
{
byteswap_body_helper (&sub,
FALSE,
old_byte_order,
new_byte_order,
p, &p);
}
}
}
else
{
_dbus_assert (current_type == DBUS_TYPE_STRING ||
current_type == DBUS_TYPE_OBJECT_PATH);
p += (array_len + 1); /* + 1 for nul */
}
}
break;
case DBUS_TYPE_SIGNATURE:
{
dbus_uint32_t sig_len;
sig_len = *p;
p += (sig_len + 2); /* +2 for len and nul */
}
break;
case DBUS_TYPE_VARIANT:
{
/* 1 byte sig len, sig typecodes, align to
* contained-type-boundary, values.
*/
dbus_uint32_t sig_len;
DBusString sig;
DBusTypeReader sub;
int contained_alignment;
sig_len = *p;
++p;
_dbus_string_init_const_len (&sig, p, sig_len);
p += (sig_len + 1); /* 1 for nul */
contained_alignment = _dbus_type_get_alignment (_dbus_first_type_in_signature (&sig, 0));
p = _DBUS_ALIGN_ADDRESS (p, contained_alignment);
_dbus_type_reader_init_types_only (&sub, &sig, 0);
byteswap_body_helper (&sub, FALSE, old_byte_order, new_byte_order, p, &p);
}
break;
case DBUS_TYPE_STRUCT:
case DBUS_TYPE_DICT_ENTRY:
{
DBusTypeReader sub;
p = _DBUS_ALIGN_ADDRESS (p, 8);
_dbus_type_reader_recurse (reader, &sub);
byteswap_body_helper (&sub, TRUE, old_byte_order, new_byte_order, p, &p);
}
break;
case DBUS_TYPE_UNIX_FD:
/* fds can only be passed on a local machine, so byte order must always match */
_dbus_assert_not_reached("attempted to byteswap unix fds which makes no sense");
break;
default:
_dbus_assert_not_reached ("invalid typecode in supposedly-validated signature");
break;
}
if (walk_reader_to_end)
_dbus_type_reader_next (reader);
else
break;
}
if (new_p)
*new_p = p;
}
/**
* Byteswaps the marshaled data in the given value_str.
*
* @param signature the types in the value_str
* @param signature_start where in signature is the signature
* @param old_byte_order the old byte order
* @param new_byte_order the new byte order
* @param value_str the string containing the body
* @param value_pos where the values start
*/
void
_dbus_marshal_byteswap (const DBusString *signature,
int signature_start,
int old_byte_order,
int new_byte_order,
DBusString *value_str,
int value_pos)
{
DBusTypeReader reader;
_dbus_assert (value_pos >= 0);
_dbus_assert (value_pos <= _dbus_string_get_length (value_str));
if (old_byte_order == new_byte_order)
return;
_dbus_type_reader_init_types_only (&reader,
signature, signature_start);
byteswap_body_helper (&reader, TRUE,
old_byte_order, new_byte_order,
_dbus_string_get_data_len (value_str, value_pos, 0),
NULL);
}
/** @} */
/* Tests in dbus-marshal-byteswap-util.c */
|
