1 /* -*- mode: C; c-file-style: "gnu" -*- */
2 /* dbus-marshal-byteswap.c Swap a block of marshaled data
4 * Copyright (C) 2005 Red Hat, Inc.
6 * Licensed under the Academic Free License version 2.1
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 #include "dbus-marshal-byteswap.h"
25 #include "dbus-marshal-basic.h"
26 #include "dbus-signature.h"
29 * @addtogroup DBusMarshal
34 byteswap_body_helper (DBusTypeReader *reader,
35 dbus_bool_t walk_reader_to_end,
39 unsigned char **new_p)
43 while ((current_type = _dbus_type_reader_get_current_type (reader)) != DBUS_TYPE_INVALID)
52 case DBUS_TYPE_UINT16:
54 p = _DBUS_ALIGN_ADDRESS (p, 2);
55 *((dbus_uint16_t*)p) = DBUS_UINT16_SWAP_LE_BE (*((dbus_uint16_t*)p));
60 case DBUS_TYPE_BOOLEAN:
62 case DBUS_TYPE_UINT32:
64 p = _DBUS_ALIGN_ADDRESS (p, 4);
65 *((dbus_uint32_t*)p) = DBUS_UINT32_SWAP_LE_BE (*((dbus_uint32_t*)p));
71 case DBUS_TYPE_UINT64:
72 case DBUS_TYPE_DOUBLE:
74 p = _DBUS_ALIGN_ADDRESS (p, 8);
75 #ifdef DBUS_HAVE_INT64
76 *((dbus_uint64_t*)p) = DBUS_UINT64_SWAP_LE_BE (*((dbus_uint64_t*)p));
78 _dbus_swap_array (p, 1, 8);
85 case DBUS_TYPE_STRING:
86 case DBUS_TYPE_OBJECT_PATH:
88 dbus_uint32_t array_len;
90 p = _DBUS_ALIGN_ADDRESS (p, 4);
92 array_len = _dbus_unpack_uint32 (old_byte_order, p);
94 *((dbus_uint32_t*)p) = DBUS_UINT32_SWAP_LE_BE (*((dbus_uint32_t*)p));
97 if (current_type == DBUS_TYPE_ARRAY)
102 elem_type = _dbus_type_reader_get_element_type (reader);
103 alignment = _dbus_type_get_alignment (elem_type);
105 _dbus_assert ((array_len / alignment) < DBUS_MAXIMUM_ARRAY_LENGTH);
107 p = _DBUS_ALIGN_ADDRESS (p, alignment);
109 if (dbus_type_is_fixed (elem_type))
112 _dbus_swap_array (p, array_len / alignment, alignment);
118 const unsigned char *array_end;
120 array_end = p + array_len;
122 _dbus_type_reader_recurse (reader, &sub);
124 while (p < array_end)
126 byteswap_body_helper (&sub,
136 _dbus_assert (current_type == DBUS_TYPE_STRING ||
137 current_type == DBUS_TYPE_OBJECT_PATH);
139 p += (array_len + 1); /* + 1 for nul */
144 case DBUS_TYPE_SIGNATURE:
146 dbus_uint32_t sig_len;
150 p += (sig_len + 2); /* +2 for len and nul */
154 case DBUS_TYPE_VARIANT:
156 /* 1 byte sig len, sig typecodes, align to
157 * contained-type-boundary, values.
159 dbus_uint32_t sig_len;
162 int contained_alignment;
167 _dbus_string_init_const_len (&sig, p, sig_len);
169 p += (sig_len + 1); /* 1 for nul */
171 contained_alignment = _dbus_type_get_alignment (_dbus_first_type_in_signature (&sig, 0));
173 p = _DBUS_ALIGN_ADDRESS (p, contained_alignment);
175 _dbus_type_reader_init_types_only (&sub, &sig, 0);
177 byteswap_body_helper (&sub, FALSE, old_byte_order, new_byte_order, p, &p);
181 case DBUS_TYPE_STRUCT:
182 case DBUS_TYPE_DICT_ENTRY:
186 p = _DBUS_ALIGN_ADDRESS (p, 8);
188 _dbus_type_reader_recurse (reader, &sub);
190 byteswap_body_helper (&sub, TRUE, old_byte_order, new_byte_order, p, &p);
195 _dbus_assert_not_reached ("invalid typecode in supposedly-validated signature");
199 if (walk_reader_to_end)
200 _dbus_type_reader_next (reader);
210 * Byteswaps the marshaled data in the given value_str.
212 * @param signature the types in the value_str
213 * @param signature_start where in signature is the signature
214 * @param old_byte_order the old byte order
215 * @param new_byte_order the new byte order
216 * @param value_str the string containing the body
217 * @param value_pos where the values start
220 _dbus_marshal_byteswap (const DBusString *signature,
224 DBusString *value_str,
227 DBusTypeReader reader;
229 _dbus_assert (value_pos >= 0);
230 _dbus_assert (value_pos <= _dbus_string_get_length (value_str));
232 if (old_byte_order == new_byte_order)
235 _dbus_type_reader_init_types_only (&reader,
236 signature, signature_start);
238 byteswap_body_helper (&reader, TRUE,
239 old_byte_order, new_byte_order,
240 _dbus_string_get_data_len (value_str, value_pos, 0),
246 /* Tests in dbus-marshal-byteswap-util.c */