D-Bus: dbus-marshal-recursive.c Source File

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dbus-marshal-recursive.c
1/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
2/* dbus-marshal-recursive.c Marshalling routines for recursive types
3 *
4 * Copyright (C) 2004, 2005 Red Hat, Inc.
5 *
6 * SPDX-License-Identifier: AFL-2.1 OR GPL-2.0-or-later
7 *
8 * Licensed under the Academic Free License version 2.1
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 *
24 */
25
26#include <config.h>
27#include "dbus-marshal-recursive.h"
28#include "dbus-marshal-basic.h"
29#include "dbus-signature.h"
30#include "dbus-internals.h"
31
37static dbus_bool_t _dbus_type_reader_greater_than (const DBusTypeReader *lhs,
38 const DBusTypeReader *rhs);
39
40static void _dbus_type_writer_set_enabled (DBusTypeWriter *writer,
41 dbus_bool_t enabled);
42static dbus_bool_t _dbus_type_writer_write_reader_partial (DBusTypeWriter *writer,
43 DBusTypeReader *reader,
44 const DBusTypeReader *start_after,
45 int start_after_new_pos,
46 int start_after_new_len,
47 DBusList **fixups);
48
50#define RECURSIVE_MARSHAL_READ_TRACE 0
51
53#define RECURSIVE_MARSHAL_WRITE_TRACE 0
54
55static void
56free_fixups (DBusList **fixups)
57{
58 DBusList *link;
59
60 link = _dbus_list_get_first_link (fixups);
61 while (link != NULL)
62 {
63 DBusList *next;
64
65 next = _dbus_list_get_next_link (fixups, link);
66
67 dbus_free (link->data);
68 _dbus_list_free_link (link);
69
70 link = next;
71 }
72
73 *fixups = NULL;
74}
75
76static void
77apply_and_free_fixups (DBusList **fixups,
78 DBusTypeReader *reader)
79{
80 DBusList *link;
81
82#if RECURSIVE_MARSHAL_WRITE_TRACE
83 if (*fixups)
84 _dbus_verbose (" %d FIXUPS to apply\n",
85 _dbus_list_get_length (fixups));
86#endif
87
88 link = _dbus_list_get_first_link (fixups);
89 while (link != NULL)
90 {
91 DBusList *next;
92
93 next = _dbus_list_get_next_link (fixups, link);
94
95 if (reader)
96 {
97 DBusArrayLenFixup *f;
98
99 f = link->data;
100
101#if RECURSIVE_MARSHAL_WRITE_TRACE
102 _dbus_verbose (" applying FIXUP to reader %p at pos %d new_len = %d old len %d\n",
103 reader, f->len_pos_in_reader, f->new_len,
104 _dbus_marshal_read_uint32 (reader->value_str,
105 f->len_pos_in_reader,
106 reader->byte_order, NULL));
107#endif
108
109 _dbus_marshal_set_uint32 ((DBusString*) reader->value_str,
110 f->len_pos_in_reader,
111 f->new_len,
112 reader->byte_order);
113 }
114
115 dbus_free (link->data);
116 _dbus_list_free_link (link);
117
118 link = next;
119 }
120
121 *fixups = NULL;
122}
123
127 struct DBusTypeReaderClass
128{
129 const char *name;
130 int id;
131 dbus_bool_t types_only;
132 void (* recurse) (DBusTypeReader *sub,
133 DBusTypeReader *parent);
134 dbus_bool_t (* check_finished) (const DBusTypeReader *reader);
135 void (* next) (DBusTypeReader *reader,
136 int current_type);
137};
138
139static int
140element_type_get_alignment (const DBusString *str,
141 int pos)
142{
143 return _dbus_type_get_alignment (_dbus_first_type_in_signature (str, pos));
144}
145
146static void
147reader_init (DBusTypeReader *reader,
148 int byte_order,
149 const DBusString *type_str,
150 int type_pos,
151 const DBusString *value_str,
152 int value_pos)
153{
154 _DBUS_ZERO (*reader);
155 reader->byte_order = byte_order;
156 reader->finished = FALSE;
157 reader->type_str = type_str;
158 reader->type_pos = type_pos;
159 reader->value_str = value_str;
160 reader->value_pos = value_pos;
161}
162
163static void
164base_reader_recurse (DBusTypeReader *sub,
165 DBusTypeReader *parent)
166{
167 /* point subreader at the same place as parent */
168 reader_init (sub,
169 parent->byte_order,
170 parent->type_str,
171 parent->type_pos,
172 parent->value_str,
173 parent->value_pos);
174}
175
176static void
177struct_or_dict_entry_types_only_reader_recurse (DBusTypeReader *sub,
178 DBusTypeReader *parent)
179{
180 base_reader_recurse (sub, parent);
181
182 _dbus_assert (_dbus_string_get_byte (sub->type_str,
183 sub->type_pos) == DBUS_STRUCT_BEGIN_CHAR ||
184 _dbus_string_get_byte (sub->type_str,
185 sub->type_pos) == DBUS_DICT_ENTRY_BEGIN_CHAR);
186
187 sub->type_pos += 1;
188}
189
190static void
191struct_or_dict_entry_reader_recurse (DBusTypeReader *sub,
192 DBusTypeReader *parent)
193{
194 struct_or_dict_entry_types_only_reader_recurse (sub, parent);
195
196 /* struct and dict entry have 8 byte alignment */
197 sub->value_pos = _DBUS_ALIGN_VALUE (sub->value_pos, 8);
198}
199
200static void
201array_types_only_reader_recurse (DBusTypeReader *sub,
202 DBusTypeReader *parent)
203{
204 base_reader_recurse (sub, parent);
205
206 /* point type_pos at the array element type */
207 sub->type_pos += 1;
208
209 /* Init with values likely to crash things if misused */
210 sub->u.array.start_pos = _DBUS_INT_MAX;
211 sub->array_len_offset = 7;
212}
213
216#define ARRAY_READER_LEN_POS(reader) \
217 ((reader)->u.array.start_pos - ((int)(reader)->array_len_offset) - 4)
218
219static int
220array_reader_get_array_len (const DBusTypeReader *reader)
221{
222 dbus_uint32_t array_len;
223 int len_pos;
224
225 len_pos = ARRAY_READER_LEN_POS (reader);
226
227 _dbus_assert (_DBUS_ALIGN_VALUE (len_pos, 4) == (unsigned) len_pos);
228 array_len = _dbus_unpack_uint32 (reader->byte_order,
229 _dbus_string_get_const_udata_len (reader->value_str, len_pos, 4));
230
231#if RECURSIVE_MARSHAL_READ_TRACE
232 _dbus_verbose (" reader %p len_pos %d array len %u len_offset %d\n",
233 reader, len_pos, array_len, reader->array_len_offset);
234#endif
235
236 _dbus_assert (reader->u.array.start_pos - len_pos - 4 < 8);
237
238 return array_len;
239}
240
241static void
242array_reader_recurse (DBusTypeReader *sub,
243 DBusTypeReader *parent)
244{
245 int alignment;
246 int len_pos;
247
248 array_types_only_reader_recurse (sub, parent);
249
250 sub->value_pos = _DBUS_ALIGN_VALUE (sub->value_pos, 4);
251
252 len_pos = sub->value_pos;
253
254 sub->value_pos += 4; /* for the length */
255
256 alignment = element_type_get_alignment (sub->type_str,
257 sub->type_pos);
258
259 sub->value_pos = _DBUS_ALIGN_VALUE (sub->value_pos, alignment);
260
261 sub->u.array.start_pos = sub->value_pos;
262 _dbus_assert ((sub->u.array.start_pos - (len_pos + 4)) < 8); /* only 3 bits in array_len_offset */
263 sub->array_len_offset = sub->u.array.start_pos - (len_pos + 4);
264
265#if RECURSIVE_MARSHAL_READ_TRACE
266 _dbus_verbose (" type reader %p array start = %d len_offset = %d array len = %d array element type = %s\n",
267 sub,
268 sub->u.array.start_pos,
269 sub->array_len_offset,
270 array_reader_get_array_len (sub),
271 _dbus_type_to_string (_dbus_first_type_in_signature (sub->type_str,
272 sub->type_pos)));
273#endif
274}
275
276static void
277variant_reader_recurse (DBusTypeReader *sub,
278 DBusTypeReader *parent)
279{
280 int sig_len;
281 int contained_alignment;
282
283 base_reader_recurse (sub, parent);
284
285 /* Variant is 1 byte sig length (without nul), signature with nul,
286 * padding to 8-boundary, then values
287 */
288
289 sig_len = _dbus_string_get_byte (sub->value_str, sub->value_pos);
290
291 sub->type_str = sub->value_str;
292 sub->type_pos = sub->value_pos + 1;
293
294 sub->value_pos = sub->type_pos + sig_len + 1;
295
296 contained_alignment = _dbus_type_get_alignment (_dbus_first_type_in_signature (sub->type_str,
297 sub->type_pos));
298
299 sub->value_pos = _DBUS_ALIGN_VALUE (sub->value_pos, contained_alignment);
300
301#if RECURSIVE_MARSHAL_READ_TRACE
302 _dbus_verbose (" type reader %p variant containing '%s'\n",
303 sub,
304 _dbus_string_get_const_data_len (sub->type_str,
305 sub->type_pos, 0));
306#endif
307}
308
309/* return true if no more elements remain */
310static dbus_bool_t
311array_reader_check_finished (const DBusTypeReader *reader)
312{
313 int end_pos;
314
315 end_pos = reader->u.array.start_pos + array_reader_get_array_len (reader);
316
317 _dbus_assert (reader->value_pos <= end_pos);
318 _dbus_assert (reader->value_pos >= reader->u.array.start_pos);
319
320 return reader->value_pos == end_pos;
321}
322
323static void
324skip_one_complete_type (const DBusString *type_str,
325 int *type_pos)
326{
327 _dbus_type_signature_next (_dbus_string_get_const_data (type_str),
328 type_pos);
329}
330
339void
340_dbus_type_signature_next (const char *type_str,
341 int *type_pos)
342{
343 const unsigned char *p;
344 const unsigned char *start;
345
346 _dbus_assert (type_str != NULL);
347 _dbus_assert (type_pos != NULL);
348
349 start = (const unsigned char *)type_str;
350 p = start + *type_pos;
351
352 _dbus_assert (*p != DBUS_STRUCT_END_CHAR);
353 _dbus_assert (*p != DBUS_DICT_ENTRY_END_CHAR);
354
355 while (*p == DBUS_TYPE_ARRAY)
356 ++p;
357
358 _dbus_assert (*p != DBUS_STRUCT_END_CHAR);
359 _dbus_assert (*p != DBUS_DICT_ENTRY_END_CHAR);
360
361 if (*p == DBUS_STRUCT_BEGIN_CHAR)
362 {
363 int depth;
364
365 depth = 1;
366
367 while (TRUE)
368 {
369 _dbus_assert (*p != DBUS_TYPE_INVALID);
370
371 ++p;
372
373 _dbus_assert (*p != DBUS_TYPE_INVALID);
374
375 if (*p == DBUS_STRUCT_BEGIN_CHAR)
376 depth += 1;
377 else if (*p == DBUS_STRUCT_END_CHAR)
378 {
379 depth -= 1;
380 if (depth == 0)
381 {
382 ++p;
383 break;
384 }
385 }
386 }
387 }
388 else if (*p == DBUS_DICT_ENTRY_BEGIN_CHAR)
389 {
390 int depth;
391
392 depth = 1;
393
394 while (TRUE)
395 {
396 _dbus_assert (*p != DBUS_TYPE_INVALID);
397
398 ++p;
399
400 _dbus_assert (*p != DBUS_TYPE_INVALID);
401
402 if (*p == DBUS_DICT_ENTRY_BEGIN_CHAR)
403 depth += 1;
404 else if (*p == DBUS_DICT_ENTRY_END_CHAR)
405 {
406 depth -= 1;
407 if (depth == 0)
408 {
409 ++p;
410 break;
411 }
412 }
413 }
414 }
415 else
416 {
417 ++p;
418 }
419
420 *type_pos = (int) (p - start);
421}
422
423static int
424find_len_of_complete_type (const DBusString *type_str,
425 int type_pos)
426{
427 int end;
428
429 end = type_pos;
430
431 skip_one_complete_type (type_str, &end);
432
433 return end - type_pos;
434}
435
436static void
437base_reader_next (DBusTypeReader *reader,
438 int current_type)
439{
440 switch (current_type)
441 {
442 case DBUS_TYPE_DICT_ENTRY:
443 case DBUS_TYPE_STRUCT:
444 case DBUS_TYPE_VARIANT:
445 /* Scan forward over the entire container contents */
446 {
447 DBusTypeReader sub;
448
449 if (reader->klass->types_only && current_type == DBUS_TYPE_VARIANT)
450 ;
451 else
452 {
453 /* Recurse into the struct or variant */
454 _dbus_type_reader_recurse (reader, &sub);
455
456 /* Skip everything in this subreader */
457 while (_dbus_type_reader_next (&sub))
458 {
459 /* nothing */;
460 }
461 }
462 if (!reader->klass->types_only)
463 reader->value_pos = sub.value_pos;
464
465 /* Now we are at the end of this container; for variants, the
466 * subreader's type_pos is totally inapplicable (it's in the
467 * value string) but we know that we increment by one past the
468 * DBUS_TYPE_VARIANT
469 */
470 if (current_type == DBUS_TYPE_VARIANT)
471 reader->type_pos += 1;
472 else
473 reader->type_pos = sub.type_pos;
474 }
475 break;
476
477 case DBUS_TYPE_ARRAY:
478 {
479 if (!reader->klass->types_only)
480 _dbus_marshal_skip_array (reader->value_str,
481 _dbus_first_type_in_signature (reader->type_str,
482 reader->type_pos + 1),
483 reader->byte_order,
484 &reader->value_pos);
485
486 skip_one_complete_type (reader->type_str, &reader->type_pos);
487 }
488 break;
489
490 default:
491 if (!reader->klass->types_only)
492 _dbus_marshal_skip_basic (reader->value_str,
493 current_type, reader->byte_order,
494 &reader->value_pos);
495
496 reader->type_pos += 1;
497 break;
498 }
499}
500
501static void
502struct_reader_next (DBusTypeReader *reader,
503 int current_type)
504{
505 int t;
506
507 base_reader_next (reader, current_type);
508
509 /* for STRUCT containers we return FALSE at the end of the struct,
510 * for INVALID we return FALSE at the end of the signature.
511 * In both cases we arrange for get_current_type() to return INVALID
512 * which is defined to happen iff we're at the end (no more next())
513 */
514 t = _dbus_string_get_byte (reader->type_str, reader->type_pos);
515 if (t == DBUS_STRUCT_END_CHAR)
516 {
517 reader->type_pos += 1;
518 reader->finished = TRUE;
519 }
520}
521
522static void
523dict_entry_reader_next (DBusTypeReader *reader,
524 int current_type)
525{
526 int t;
527
528 base_reader_next (reader, current_type);
529
530 /* for STRUCT containers we return FALSE at the end of the struct,
531 * for INVALID we return FALSE at the end of the signature.
532 * In both cases we arrange for get_current_type() to return INVALID
533 * which is defined to happen iff we're at the end (no more next())
534 */
535 t = _dbus_string_get_byte (reader->type_str, reader->type_pos);
536 if (t == DBUS_DICT_ENTRY_END_CHAR)
537 {
538 reader->type_pos += 1;
539 reader->finished = TRUE;
540 }
541}
542
543static void
544array_types_only_reader_next (DBusTypeReader *reader,
545 int current_type)
546{
547 /* We have one "element" to be iterated over
548 * in each array, which is its element type.
549 * So the finished flag indicates whether we've
550 * iterated over it yet or not.
551 */
552 reader->finished = TRUE;
553}
554
555static void
556array_reader_next (DBusTypeReader *reader,
557 int current_type)
558{
559 /* Skip one array element */
560 int end_pos;
561
562 end_pos = reader->u.array.start_pos + array_reader_get_array_len (reader);
563
564#if RECURSIVE_MARSHAL_READ_TRACE
565 _dbus_verbose (" reader %p array next START start_pos = %d end_pos = %d value_pos = %d current_type = %s\n",
566 reader,
567 reader->u.array.start_pos,
568 end_pos, reader->value_pos,
569 _dbus_type_to_string (current_type));
570#endif
571
572 _dbus_assert (reader->value_pos < end_pos);
573 _dbus_assert (reader->value_pos >= reader->u.array.start_pos);
574
575 switch (_dbus_first_type_in_signature (reader->type_str,
576 reader->type_pos))
577 {
578 case DBUS_TYPE_DICT_ENTRY:
579 case DBUS_TYPE_STRUCT:
580 case DBUS_TYPE_VARIANT:
581 {
582 DBusTypeReader sub;
583
584 /* Recurse into the struct or variant */
585 _dbus_type_reader_recurse (reader, &sub);
586
587 /* Skip everything in this element */
588 while (_dbus_type_reader_next (&sub))
589 {
590 /* nothing */;
591 }
592
593 /* Now we are at the end of this element */
594 reader->value_pos = sub.value_pos;
595 }
596 break;
597
598 case DBUS_TYPE_ARRAY:
599 {
600 _dbus_marshal_skip_array (reader->value_str,
601 _dbus_first_type_in_signature (reader->type_str,
602 reader->type_pos + 1),
603 reader->byte_order,
604 &reader->value_pos);
605 }
606 break;
607
608 default:
609 {
610 _dbus_marshal_skip_basic (reader->value_str,
611 current_type, reader->byte_order,
612 &reader->value_pos);
613 }
614 break;
615 }
616
617#if RECURSIVE_MARSHAL_READ_TRACE
618 _dbus_verbose (" reader %p array next END start_pos = %d end_pos = %d value_pos = %d current_type = %s\n",
619 reader,
620 reader->u.array.start_pos,
621 end_pos, reader->value_pos,
622 _dbus_type_to_string (current_type));
623#endif
624
625 _dbus_assert (reader->value_pos <= end_pos);
626
627 if (reader->value_pos == end_pos)
628 {
629 skip_one_complete_type (reader->type_str,
630 &reader->type_pos);
631 }
632}
633
634static const DBusTypeReaderClass body_reader_class = {
635 "body", 0,
636 FALSE,
637 NULL, /* body is always toplevel, so doesn't get recursed into */
638 NULL,
639 base_reader_next
640};
641
642static const DBusTypeReaderClass body_types_only_reader_class = {
643 "body types", 1,
644 TRUE,
645 NULL, /* body is always toplevel, so doesn't get recursed into */
646 NULL,
647 base_reader_next
648};
649
650static const DBusTypeReaderClass struct_reader_class = {
651 "struct", 2,
652 FALSE,
653 struct_or_dict_entry_reader_recurse,
654 NULL,
655 struct_reader_next
656};
657
658static const DBusTypeReaderClass struct_types_only_reader_class = {
659 "struct types", 3,
660 TRUE,
661 struct_or_dict_entry_types_only_reader_recurse,
662 NULL,
663 struct_reader_next
664};
665
666static const DBusTypeReaderClass dict_entry_reader_class = {
667 "dict_entry", 4,
668 FALSE,
669 struct_or_dict_entry_reader_recurse,
670 NULL,
671 dict_entry_reader_next
672};
673
674static const DBusTypeReaderClass dict_entry_types_only_reader_class = {
675 "dict_entry types", 5,
676 TRUE,
677 struct_or_dict_entry_types_only_reader_recurse,
678 NULL,
679 dict_entry_reader_next
680};
681
682static const DBusTypeReaderClass array_reader_class = {
683 "array", 6,
684 FALSE,
685 array_reader_recurse,
686 array_reader_check_finished,
687 array_reader_next
688};
689
690static const DBusTypeReaderClass array_types_only_reader_class = {
691 "array types", 7,
692 TRUE,
693 array_types_only_reader_recurse,
694 NULL,
695 array_types_only_reader_next
696};
697
698static const DBusTypeReaderClass variant_reader_class = {
699 "variant", 8,
700 FALSE,
701 variant_reader_recurse,
702 NULL,
703 base_reader_next
704};
705
706#ifndef DBUS_DISABLE_ASSERT
707static const DBusTypeReaderClass * const
708all_reader_classes[] = {
709 &body_reader_class,
710 &body_types_only_reader_class,
711 &struct_reader_class,
712 &struct_types_only_reader_class,
713 &dict_entry_reader_class,
714 &dict_entry_types_only_reader_class,
715 &array_reader_class,
716 &array_types_only_reader_class,
717 &variant_reader_class
718};
719#endif
720
731void
732_dbus_type_reader_init (DBusTypeReader *reader,
733 int byte_order,
734 const DBusString *type_str,
735 int type_pos,
736 const DBusString *value_str,
737 int value_pos)
738{
739 reader_init (reader, byte_order, type_str, type_pos,
740 value_str, value_pos);
741
742 reader->klass = &body_reader_class;
743
744#if RECURSIVE_MARSHAL_READ_TRACE
745 _dbus_verbose (" type reader %p init type_pos = %d value_pos = %d remaining sig '%s'\n",
746 reader, reader->type_pos, reader->value_pos,
747 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0));
748#endif
749}
750
759void
760_dbus_type_reader_init_types_only (DBusTypeReader *reader,
761 const DBusString *type_str,
762 int type_pos)
763{
764 reader_init (reader, DBUS_COMPILER_BYTE_ORDER /* irrelevant */,
765 type_str, type_pos, NULL, _DBUS_INT_MAX /* crashes if we screw up */);
766
767 reader->klass = &body_types_only_reader_class;
768
769#if RECURSIVE_MARSHAL_READ_TRACE
770 _dbus_verbose (" type reader %p init types only type_pos = %d remaining sig '%s'\n",
771 reader, reader->type_pos,
772 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0));
773#endif
774}
775
784int
785_dbus_type_reader_get_current_type (const DBusTypeReader *reader)
786{
787 int t;
788
789 if (reader->finished ||
790 (reader->klass->check_finished &&
791 (* reader->klass->check_finished) (reader)))
792 t = DBUS_TYPE_INVALID;
793 else
794 t = _dbus_first_type_in_signature (reader->type_str,
795 reader->type_pos);
796
797 _dbus_assert (t != DBUS_STRUCT_END_CHAR);
798 _dbus_assert (t != DBUS_STRUCT_BEGIN_CHAR);
799 _dbus_assert (t != DBUS_DICT_ENTRY_END_CHAR);
800 _dbus_assert (t != DBUS_DICT_ENTRY_BEGIN_CHAR);
801
802#if 0
803 _dbus_verbose (" type reader %p current type_pos = %d type = %s\n",
804 reader, reader->type_pos,
805 _dbus_type_to_string (t));
806#endif
807
808 return t;
809}
810
819int
820_dbus_type_reader_get_element_type (const DBusTypeReader *reader)
821{
822 int element_type;
823
824 _dbus_assert (_dbus_type_reader_get_current_type (reader) == DBUS_TYPE_ARRAY);
825
826 element_type = _dbus_first_type_in_signature (reader->type_str,
827 reader->type_pos + 1);
828
829 return element_type;
830}
831
836int
837_dbus_type_reader_get_value_pos (const DBusTypeReader *reader)
838{
839 return reader->value_pos;
840}
841
851void
852_dbus_type_reader_read_raw (const DBusTypeReader *reader,
853 const unsigned char **value_location)
854{
855 _dbus_assert (!reader->klass->types_only);
856
857 *value_location = _dbus_string_get_const_udata_len (reader->value_str,
858 reader->value_pos,
859 0);
860}
861
868void
869_dbus_type_reader_read_basic (const DBusTypeReader *reader,
870 void *value)
871{
872 int t;
873
874 _dbus_assert (!reader->klass->types_only);
875
876 t = _dbus_type_reader_get_current_type (reader);
877
878 _dbus_marshal_read_basic (reader->value_str,
879 reader->value_pos,
880 t, value,
881 reader->byte_order,
882 NULL);
883
884
885#if RECURSIVE_MARSHAL_READ_TRACE
886 _dbus_verbose (" type reader %p read basic type_pos = %d value_pos = %d remaining sig '%s'\n",
887 reader, reader->type_pos, reader->value_pos,
888 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0));
889#endif
890}
891
898int
899_dbus_type_reader_get_array_length (const DBusTypeReader *reader)
900{
901 _dbus_assert (!reader->klass->types_only);
902 _dbus_assert (reader->klass == &array_reader_class);
903
904 return array_reader_get_array_len (reader);
905}
906
922void
923_dbus_type_reader_read_fixed_multi (const DBusTypeReader *reader,
924 const void **value,
925 int *n_elements)
926{
927 int element_type;
928 int end_pos;
929 int remaining_len;
930 int alignment;
931 int total_len;
932
933 _dbus_assert (!reader->klass->types_only);
934 _dbus_assert (reader->klass == &array_reader_class);
935
936 element_type = _dbus_first_type_in_signature (reader->type_str,
937 reader->type_pos);
938
939 _dbus_assert (element_type != DBUS_TYPE_INVALID); /* why we don't use get_current_type() */
940 _dbus_assert (dbus_type_is_fixed (element_type));
941
942 alignment = _dbus_type_get_alignment (element_type);
943
944 _dbus_assert (reader->value_pos >= reader->u.array.start_pos);
945
946 total_len = array_reader_get_array_len (reader);
947 end_pos = reader->u.array.start_pos + total_len;
948 remaining_len = end_pos - reader->value_pos;
949
950#if RECURSIVE_MARSHAL_READ_TRACE
951 _dbus_verbose ("end_pos %d total_len %d remaining_len %d value_pos %d\n",
952 end_pos, total_len, remaining_len, reader->value_pos);
953#endif
954
955 _dbus_assert (remaining_len <= total_len);
956
957 if (remaining_len == 0)
958 *value = NULL;
959 else
960 *value = _dbus_string_get_const_data_len (reader->value_str,
961 reader->value_pos,
962 remaining_len);
963
964 *n_elements = remaining_len / alignment;
965 _dbus_assert ((remaining_len % alignment) == 0);
966
967#if RECURSIVE_MARSHAL_READ_TRACE
968 _dbus_verbose (" type reader %p read fixed array type_pos = %d value_pos = %d remaining sig '%s'\n",
969 reader, reader->type_pos, reader->value_pos,
970 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0));
971#endif
972}
973
986void
987_dbus_type_reader_recurse (DBusTypeReader *reader,
988 DBusTypeReader *sub)
989{
990 int t;
991 const DBusTypeReaderClass *klass = NULL;
992
993 t = _dbus_first_type_in_signature (reader->type_str, reader->type_pos);
994
995 switch (t)
996 {
997 case DBUS_TYPE_STRUCT:
998 if (reader->klass->types_only)
999 klass = &struct_types_only_reader_class;
1000 else
1001 klass = &struct_reader_class;
1002 break;
1003 case DBUS_TYPE_DICT_ENTRY:
1004 if (reader->klass->types_only)
1005 klass = &dict_entry_types_only_reader_class;
1006 else
1007 klass = &dict_entry_reader_class;
1008 break;
1009 case DBUS_TYPE_ARRAY:
1010 if (reader->klass->types_only)
1011 klass = &array_types_only_reader_class;
1012 else
1013 klass = &array_reader_class;
1014 break;
1015 case DBUS_TYPE_VARIANT:
1016 if (reader->klass->types_only)
1017 _dbus_assert_not_reached ("can't recurse into variant typecode");
1018 else
1019 klass = &variant_reader_class;
1020 break;
1021 default:
1022 _dbus_verbose ("recursing into type %s\n", _dbus_type_to_string (t));
1023#ifndef DBUS_DISABLE_CHECKS
1024 if (t == DBUS_TYPE_INVALID)
1025 _dbus_warn_check_failed ("You can't recurse into an empty array or off the end of a message body");
1026#endif /* DBUS_DISABLE_CHECKS */
1027
1028 _dbus_assert_not_reached ("don't yet handle recursing into this type");
1029 }
1030
1031 _dbus_assert (klass != NULL);
1032 _dbus_assert (klass == all_reader_classes[klass->id]);
1033
1034 (* klass->recurse) (sub, reader);
1035 sub->klass = klass;
1036
1037#if RECURSIVE_MARSHAL_READ_TRACE
1038 _dbus_verbose (" type reader %p RECURSED type_pos = %d value_pos = %d remaining sig '%s'\n",
1039 sub, sub->type_pos, sub->value_pos,
1040 _dbus_string_get_const_data_len (sub->type_str, sub->type_pos, 0));
1041#endif
1042}
1043
1052dbus_bool_t
1053_dbus_type_reader_next (DBusTypeReader *reader)
1054{
1055 int t;
1056
1057 t = _dbus_type_reader_get_current_type (reader);
1058
1059#if RECURSIVE_MARSHAL_READ_TRACE
1060 _dbus_verbose (" type reader %p START next() { type_pos = %d value_pos = %d remaining sig '%s' current_type = %s\n",
1061 reader, reader->type_pos, reader->value_pos,
1062 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0),
1063 _dbus_type_to_string (t));
1064#endif
1065
1066 if (t == DBUS_TYPE_INVALID)
1067 return FALSE;
1068
1069 (* reader->klass->next) (reader, t);
1070
1071#if RECURSIVE_MARSHAL_READ_TRACE
1072 _dbus_verbose (" type reader %p END next() type_pos = %d value_pos = %d remaining sig '%s' current_type = %s\n",
1073 reader, reader->type_pos, reader->value_pos,
1074 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0),
1075 _dbus_type_to_string (_dbus_type_reader_get_current_type (reader)));
1076#endif
1077
1078 return _dbus_type_reader_get_current_type (reader) != DBUS_TYPE_INVALID;
1079}
1080
1092dbus_bool_t
1093_dbus_type_reader_has_next (const DBusTypeReader *reader)
1094{
1095 /* Not efficient but works for now. */
1096 DBusTypeReader copy;
1097
1098 copy = *reader;
1099 return _dbus_type_reader_next (&copy);
1100}
1101
1123void
1124_dbus_type_reader_get_signature (const DBusTypeReader *reader,
1125 const DBusString **str_p,
1126 int *start_p,
1127 int *len_p)
1128{
1129 *str_p = reader->type_str;
1130 *start_p = reader->type_pos;
1131 *len_p = find_len_of_complete_type (reader->type_str, reader->type_pos);
1132}
1133
1134 typedef struct
1135{
1136 DBusString replacement;
1137 int padding;
1138} ReplacementBlock;
1139
1140static dbus_bool_t
1141replacement_block_init (ReplacementBlock *block,
1142 DBusTypeReader *reader)
1143{
1144 if (!_dbus_string_init (&block->replacement))
1145 return FALSE;
1146
1147 /* % 8 is the padding to have the same align properties in
1148 * our replacement string as we do at the position being replaced
1149 */
1150 block->padding = reader->value_pos % 8;
1151
1152 if (!_dbus_string_lengthen (&block->replacement, block->padding))
1153 goto oom;
1154
1155 return TRUE;
1156
1157 oom:
1158 _dbus_string_free (&block->replacement);
1159 return FALSE;
1160}
1161
1162static dbus_bool_t
1163replacement_block_replace (ReplacementBlock *block,
1164 DBusTypeReader *reader,
1165 const DBusTypeReader *realign_root)
1166{
1167 DBusTypeWriter writer;
1168 DBusTypeReader realign_reader;
1169 DBusList *fixups;
1170 int orig_len;
1171
1172 _dbus_assert (realign_root != NULL);
1173
1174 orig_len = _dbus_string_get_length (&block->replacement);
1175
1176 realign_reader = *realign_root;
1177
1178#if RECURSIVE_MARSHAL_WRITE_TRACE
1179 _dbus_verbose ("INITIALIZING replacement block writer %p at value_pos %d\n",
1180 &writer, _dbus_string_get_length (&block->replacement));
1181#endif
1182 _dbus_type_writer_init_values_only (&writer,
1183 realign_reader.byte_order,
1184 realign_reader.type_str,
1185 realign_reader.type_pos,
1186 &block->replacement,
1187 _dbus_string_get_length (&block->replacement));
1188
1189 _dbus_assert (realign_reader.value_pos <= reader->value_pos);
1190
1191#if RECURSIVE_MARSHAL_WRITE_TRACE
1192 _dbus_verbose ("COPYING from reader at value_pos %d to writer %p starting after value_pos %d\n",
1193 realign_reader.value_pos, &writer, reader->value_pos);
1194#endif
1195 fixups = NULL;
1196 if (!_dbus_type_writer_write_reader_partial (&writer,
1197 &realign_reader,
1198 reader,
1199 block->padding,
1200 _dbus_string_get_length (&block->replacement) - block->padding,
1201 &fixups))
1202 goto oom;
1203
1204#if RECURSIVE_MARSHAL_WRITE_TRACE
1205 _dbus_verbose ("REPLACEMENT at padding %d len %d\n", block->padding,
1206 _dbus_string_get_length (&block->replacement) - block->padding);
1207 _dbus_verbose_bytes_of_string (&block->replacement, block->padding,
1208 _dbus_string_get_length (&block->replacement) - block->padding);
1209 _dbus_verbose ("TO BE REPLACED at value_pos = %d (align pad %d) len %d realign_reader.value_pos %d\n",
1210 reader->value_pos, reader->value_pos % 8,
1211 realign_reader.value_pos - reader->value_pos,
1212 realign_reader.value_pos);
1213 _dbus_verbose_bytes_of_string (reader->value_str,
1214 reader->value_pos,
1215 realign_reader.value_pos - reader->value_pos);
1216#endif
1217
1218 /* Move the replacement into position
1219 * (realign_reader should now be at the end of the block to be replaced)
1220 */
1221 if (!_dbus_string_replace_len (&block->replacement, block->padding,
1222 _dbus_string_get_length (&block->replacement) - block->padding,
1223 (DBusString*) reader->value_str,
1224 reader->value_pos,
1225 realign_reader.value_pos - reader->value_pos))
1226 goto oom;
1227
1228 /* Process our fixups now that we can't have an OOM error */
1229 apply_and_free_fixups (&fixups, reader);
1230
1231 return TRUE;
1232
1233 oom:
1234 _dbus_string_set_length (&block->replacement, orig_len);
1235 free_fixups (&fixups);
1236 return FALSE;
1237}
1238
1239static void
1240replacement_block_free (ReplacementBlock *block)
1241{
1242 _dbus_string_free (&block->replacement);
1243}
1244
1245/* In the variable-length case, we have to fix alignment after we insert.
1246 * The strategy is as follows:
1247 *
1248 * - pad a new string to have the same alignment as the
1249 * start of the current basic value
1250 * - write the new basic value
1251 * - copy from the original reader to the new string,
1252 * which will fix the alignment of types following
1253 * the new value
1254 * - this copy has to start at realign_root,
1255 * but not really write anything until it
1256 * passes the value being set
1257 * - as an optimization, we can stop copying
1258 * when the source and dest values are both
1259 * on an 8-boundary, since we know all following
1260 * padding and alignment will be identical
1261 * - copy the new string back to the original
1262 * string, replacing the relevant part of the
1263 * original string
1264 * - now any arrays in the original string that
1265 * contained the replaced string may have the
1266 * wrong length; so we have to fix that
1267 */
1268static dbus_bool_t
1269reader_set_basic_variable_length (DBusTypeReader *reader,
1270 int current_type,
1271 const void *value,
1272 const DBusTypeReader *realign_root)
1273{
1274 dbus_bool_t retval;
1275 ReplacementBlock block;
1276 DBusTypeWriter writer;
1277
1278 _dbus_assert (realign_root != NULL);
1279
1280 retval = FALSE;
1281
1282 if (!replacement_block_init (&block, reader))
1283 return FALSE;
1284
1285 /* Write the new basic value */
1286#if RECURSIVE_MARSHAL_WRITE_TRACE
1287 _dbus_verbose ("INITIALIZING writer %p to write basic value at value_pos %d of replacement string\n",
1288 &writer, _dbus_string_get_length (&block.replacement));
1289#endif
1290 _dbus_type_writer_init_values_only (&writer,
1291 reader->byte_order,
1292 reader->type_str,
1293 reader->type_pos,
1294 &block.replacement,
1295 _dbus_string_get_length (&block.replacement));
1296#if RECURSIVE_MARSHAL_WRITE_TRACE
1297 _dbus_verbose ("WRITING basic value to writer %p (replacement string)\n", &writer);
1298#endif
1299 if (!_dbus_type_writer_write_basic (&writer, current_type, value))
1300 goto out;
1301
1302 if (!replacement_block_replace (&block,
1303 reader,
1304 realign_root))
1305 goto out;
1306
1307 retval = TRUE;
1308
1309 out:
1310 replacement_block_free (&block);
1311 return retval;
1312}
1313
1314static void
1315reader_set_basic_fixed_length (DBusTypeReader *reader,
1316 int current_type,
1317 const void *value)
1318{
1319 _dbus_marshal_set_basic ((DBusString*) reader->value_str,
1320 reader->value_pos,
1321 current_type,
1322 value,
1323 reader->byte_order,
1324 NULL, NULL);
1325}
1326
1361dbus_bool_t
1362_dbus_type_reader_set_basic (DBusTypeReader *reader,
1363 const void *value,
1364 const DBusTypeReader *realign_root)
1365{
1366 int current_type;
1367
1368 _dbus_assert (!reader->klass->types_only);
1369 _dbus_assert (reader->value_str == realign_root->value_str);
1370 _dbus_assert (reader->value_pos >= realign_root->value_pos);
1371
1372 current_type = _dbus_type_reader_get_current_type (reader);
1373
1374#if RECURSIVE_MARSHAL_WRITE_TRACE
1375 _dbus_verbose (" SET BASIC type reader %p type_pos = %d value_pos = %d remaining sig '%s' realign_root = %p with value_pos %d current_type = %s\n",
1376 reader, reader->type_pos, reader->value_pos,
1377 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0),
1378 realign_root,
1379 realign_root ? realign_root->value_pos : -1,
1380 _dbus_type_to_string (current_type));
1381 _dbus_verbose_bytes_of_string (realign_root->value_str, realign_root->value_pos,
1382 _dbus_string_get_length (realign_root->value_str) -
1383 realign_root->value_pos);
1384#endif
1385
1386 _dbus_assert (dbus_type_is_basic (current_type));
1387
1388 if (dbus_type_is_fixed (current_type))
1389 {
1390 reader_set_basic_fixed_length (reader, current_type, value);
1391 return TRUE;
1392 }
1393 else
1394 {
1395 _dbus_assert (realign_root != NULL);
1396 return reader_set_basic_variable_length (reader, current_type,
1397 value, realign_root);
1398 }
1399}
1400
1418dbus_bool_t
1419_dbus_type_reader_delete (DBusTypeReader *reader,
1420 const DBusTypeReader *realign_root)
1421{
1422 dbus_bool_t retval;
1423 ReplacementBlock block;
1424
1425 _dbus_assert (realign_root != NULL);
1426 _dbus_assert (reader->klass == &array_reader_class);
1427
1428 retval = FALSE;
1429
1430 if (!replacement_block_init (&block, reader))
1431 return FALSE;
1432
1433 if (!replacement_block_replace (&block,
1434 reader,
1435 realign_root))
1436 goto out;
1437
1438 retval = TRUE;
1439
1440 out:
1441 replacement_block_free (&block);
1442 return retval;
1443}
1444
1445/*
1446 * Compares two readers, which must be iterating over the same value data.
1447 * Returns #TRUE if the first parameter is further along than the second parameter.
1448 *
1449 * @param lhs left-hand-side (first) parameter
1450 * @param rhs left-hand-side (first) parameter
1451 * @returns whether lhs is greater than rhs
1452 */
1453static dbus_bool_t
1454_dbus_type_reader_greater_than (const DBusTypeReader *lhs,
1455 const DBusTypeReader *rhs)
1456{
1457 _dbus_assert (lhs->value_str == rhs->value_str);
1458
1459 return lhs->value_pos > rhs->value_pos;
1460}
1461
1462/*
1463 *
1464 *
1465 * DBusTypeWriter
1466 *
1467 *
1468 *
1469 */
1470
1491void
1492_dbus_type_writer_init (DBusTypeWriter *writer,
1493 int byte_order,
1494 DBusString *type_str,
1495 int type_pos,
1496 DBusString *value_str,
1497 int value_pos)
1498{
1499 writer->byte_order = byte_order;
1500 writer->type_str = type_str;
1501 writer->type_pos = type_pos;
1502 writer->value_str = value_str;
1503 writer->value_pos = value_pos;
1504 writer->container_type = DBUS_TYPE_INVALID;
1505 writer->type_pos_is_expectation = FALSE;
1506 writer->enabled = TRUE;
1507
1508#if RECURSIVE_MARSHAL_WRITE_TRACE
1509 _dbus_verbose ("writer %p init remaining sig '%s'\n", writer,
1510 writer->type_str ?
1511 _dbus_string_get_const_data_len (writer->type_str, writer->type_pos, 0) :
1512 "unknown");
1513#endif
1514}
1515
1526void
1527_dbus_type_writer_init_types_delayed (DBusTypeWriter *writer,
1528 int byte_order,
1529 DBusString *value_str,
1530 int value_pos)
1531{
1532 _dbus_type_writer_init (writer, byte_order,
1533 NULL, 0, value_str, value_pos);
1534}
1535
1544void
1545_dbus_type_writer_add_types (DBusTypeWriter *writer,
1546 DBusString *type_str,
1547 int type_pos)
1548{
1549 if (writer->type_str == NULL) /* keeps us from using this as setter */
1550 {
1551 writer->type_str = type_str;
1552 writer->type_pos = type_pos;
1553 }
1554}
1555
1561void
1562_dbus_type_writer_remove_types (DBusTypeWriter *writer)
1563{
1564 writer->type_str = NULL;
1565 writer->type_pos = -1;
1566}
1567
1582void
1583_dbus_type_writer_init_values_only (DBusTypeWriter *writer,
1584 int byte_order,
1585 const DBusString *type_str,
1586 int type_pos,
1587 DBusString *value_str,
1588 int value_pos)
1589{
1590 _dbus_type_writer_init (writer, byte_order,
1591 (DBusString*)type_str, type_pos,
1592 value_str, value_pos);
1593
1594 writer->type_pos_is_expectation = TRUE;
1595}
1596
1597static dbus_bool_t
1598_dbus_type_writer_write_basic_no_typecode (DBusTypeWriter *writer,
1599 int type,
1600 const void *value)
1601{
1602 if (writer->enabled)
1603 return _dbus_marshal_write_basic (writer->value_str,
1604 writer->value_pos,
1605 type,
1606 value,
1607 writer->byte_order,
1608 &writer->value_pos);
1609 else
1610 return TRUE;
1611}
1612
1613/* If our parent is an array, things are a little bit complicated.
1614 *
1615 * The parent must have a complete element type, such as
1616 * "i" or "aai" or "(ii)" or "a(ii)". There can't be
1617 * unclosed parens, or an "a" with no following type.
1618 *
1619 * To recurse, the only allowed operation is to recurse into the
1620 * first type in the element type. So for "i" you can't recurse, for
1621 * "ai" you can recurse into the array, for "(ii)" you can recurse
1622 * into the struct.
1623 *
1624 * If you recurse into the array for "ai", then you must specify
1625 * "i" for the element type of the array you recurse into.
1626 *
1627 * While inside an array at any level, we need to avoid writing to
1628 * type_str, since the type only appears once for the whole array,
1629 * it does not appear for each array element.
1630 *
1631 * While inside an array type_pos points to the expected next
1632 * typecode, rather than the next place we could write a typecode.
1633 */
1634static void
1635writer_recurse_init_and_check (DBusTypeWriter *writer,
1636 int container_type,
1637 DBusTypeWriter *sub)
1638{
1639 _dbus_type_writer_init (sub,
1640 writer->byte_order,
1641 writer->type_str,
1642 writer->type_pos,
1643 writer->value_str,
1644 writer->value_pos);
1645
1646 sub->container_type = container_type;
1647
1648 if (writer->type_pos_is_expectation ||
1649 (sub->container_type == DBUS_TYPE_ARRAY || sub->container_type == DBUS_TYPE_VARIANT))
1650 sub->type_pos_is_expectation = TRUE;
1651 else
1652 sub->type_pos_is_expectation = FALSE;
1653
1654 sub->enabled = writer->enabled;
1655
1656#ifndef DBUS_DISABLE_CHECKS
1657 if (writer->type_pos_is_expectation && writer->type_str)
1658 {
1659 int expected;
1660
1661 expected = _dbus_first_type_in_signature (writer->type_str, writer->type_pos);
1662
1663 if (expected != sub->container_type)
1664 {
1665 if (expected != DBUS_TYPE_INVALID)
1666 _dbus_warn_check_failed ("Writing an element of type %s, but the expected type here is %s\n"
1667 "The overall signature expected here was '%s' and we are on byte %d of that signature.",
1668 _dbus_type_to_string (sub->container_type),
1669 _dbus_type_to_string (expected),
1670 _dbus_string_get_const_data (writer->type_str), writer->type_pos);
1671 else
1672 _dbus_warn_check_failed ("Writing an element of type %s, but no value is expected here\n"
1673 "The overall signature expected here was '%s' and we are on byte %d of that signature.",
1674 _dbus_type_to_string (sub->container_type),
1675 _dbus_string_get_const_data (writer->type_str), writer->type_pos);
1676
1677 _dbus_assert_not_reached ("bad array element or variant content written");
1678 }
1679 }
1680#endif /* DBUS_DISABLE_CHECKS */
1681
1682#if RECURSIVE_MARSHAL_WRITE_TRACE
1683 _dbus_verbose (" type writer %p recurse parent %s type_pos = %d value_pos = %d is_expectation = %d remaining sig '%s' enabled = %d\n",
1684 writer,
1685 _dbus_type_to_string (writer->container_type),
1686 writer->type_pos, writer->value_pos, writer->type_pos_is_expectation,
1687 writer->type_str ?
1688 _dbus_string_get_const_data_len (writer->type_str, writer->type_pos, 0) :
1689 "unknown",
1690 writer->enabled);
1691 _dbus_verbose (" type writer %p recurse sub %s type_pos = %d value_pos = %d is_expectation = %d enabled = %d\n",
1692 sub,
1693 _dbus_type_to_string (sub->container_type),
1694 sub->type_pos, sub->value_pos,
1695 sub->type_pos_is_expectation,
1696 sub->enabled);
1697#endif
1698}
1699
1700static dbus_bool_t
1701write_or_verify_typecode (DBusTypeWriter *writer,
1702 int typecode)
1703{
1704 /* A subwriter inside an array or variant will have type_pos
1705 * pointing to the expected typecode; a writer not inside an array
1706 * or variant has type_pos pointing to the next place to insert a
1707 * typecode.
1708 */
1709#if RECURSIVE_MARSHAL_WRITE_TRACE
1710 _dbus_verbose (" type writer %p write_or_verify start type_pos = %d remaining sig '%s' enabled = %d\n",
1711 writer, writer->type_pos,
1712 writer->type_str ?
1713 _dbus_string_get_const_data_len (writer->type_str, writer->type_pos, 0) :
1714 "unknown",
1715 writer->enabled);
1716#endif
1717
1718 if (writer->type_str == NULL)
1719 return TRUE;
1720
1721 if (writer->type_pos_is_expectation)
1722 {
1723#ifndef DBUS_DISABLE_CHECKS
1724 {
1725 int expected;
1726
1727 expected = _dbus_string_get_byte (writer->type_str, writer->type_pos);
1728
1729 if (expected != typecode)
1730 {
1731 if (expected != DBUS_TYPE_INVALID)
1732 _dbus_warn_check_failed ("Array or variant type requires that type %s be written, but %s was written.\n"
1733 "The overall signature expected here was '%s' and we are on byte %d of that signature.",
1734 _dbus_type_to_string (expected), _dbus_type_to_string (typecode),
1735 _dbus_string_get_const_data (writer->type_str), writer->type_pos);
1736 else
1737 _dbus_warn_check_failed ("Array or variant type wasn't expecting any more values to be written into it, but a value %s was written.\n"
1738 "The overall signature expected here was '%s' and we are on byte %d of that signature.",
1739 _dbus_type_to_string (typecode),
1740 _dbus_string_get_const_data (writer->type_str), writer->type_pos);
1741 _dbus_assert_not_reached ("bad type inserted somewhere inside an array or variant");
1742 }
1743 }
1744#endif /* DBUS_DISABLE_CHECKS */
1745
1746 /* if immediately inside an array we'd always be appending an element,
1747 * so the expected type doesn't change; if inside a struct or something
1748 * below an array, we need to move through said struct or something.
1749 */
1750 if (writer->container_type != DBUS_TYPE_ARRAY)
1751 writer->type_pos += 1;
1752 }
1753 else
1754 {
1755 if (!_dbus_string_insert_byte (writer->type_str,
1756 writer->type_pos,
1757 typecode))
1758 return FALSE;
1759
1760 writer->type_pos += 1;
1761 }
1762
1763#if RECURSIVE_MARSHAL_WRITE_TRACE
1764 _dbus_verbose (" type writer %p write_or_verify end type_pos = %d remaining sig '%s'\n",
1765 writer, writer->type_pos,
1766 _dbus_string_get_const_data_len (writer->type_str, writer->type_pos, 0));
1767#endif
1768
1769 return TRUE;
1770}
1771
1772static dbus_bool_t
1773writer_recurse_struct_or_dict_entry (DBusTypeWriter *writer,
1774 int begin_char,
1775 const DBusString *contained_type,
1776 int contained_type_start,
1777 int contained_type_len,
1778 DBusTypeWriter *sub)
1779{
1780 /* FIXME right now contained_type is ignored; we could probably
1781 * almost trivially fix the code so if it's present we
1782 * write it out and then set type_pos_is_expectation
1783 */
1784
1785 /* Ensure that we'll be able to add alignment padding and the typecode */
1786 if (writer->enabled)
1787 {
1788 if (!_dbus_string_alloc_space (sub->value_str, 8))
1789 return FALSE;
1790 }
1791
1792 if (!write_or_verify_typecode (sub, begin_char))
1793 _dbus_assert_not_reached ("failed to insert struct typecode after prealloc");
1794
1795 if (writer->enabled)
1796 {
1797 if (!_dbus_string_insert_bytes (sub->value_str,
1798 sub->value_pos,
1799 _DBUS_ALIGN_VALUE (sub->value_pos, 8) - sub->value_pos,
1800 '\0'))
1801 _dbus_assert_not_reached ("should not have failed to insert alignment padding for struct");
1802 sub->value_pos = _DBUS_ALIGN_VALUE (sub->value_pos, 8);
1803 }
1804
1805 return TRUE;
1806}
1807
1808
1809static dbus_bool_t
1810writer_recurse_array (DBusTypeWriter *writer,
1811 const DBusString *contained_type,
1812 int contained_type_start,
1813 int contained_type_len,
1814 DBusTypeWriter *sub,
1815 dbus_bool_t is_array_append)
1816{
1817 dbus_uint32_t value = 0;
1818 int alignment;
1819 int aligned;
1820
1821#ifndef DBUS_DISABLE_CHECKS
1822 if (writer->container_type == DBUS_TYPE_ARRAY &&
1823 writer->type_str)
1824 {
1825 if (!_dbus_string_equal_substring (contained_type,
1826 contained_type_start,
1827 contained_type_len,
1828 writer->type_str,
1829 writer->u.array.element_type_pos + 1))
1830 {
1831 _dbus_warn_check_failed ("Writing an array of '%s' but this is incompatible with the expected type of elements in the parent array",
1832 _dbus_string_get_const_data_len (contained_type,
1833 contained_type_start,
1834 contained_type_len));
1835 _dbus_assert_not_reached ("incompatible type for child array");
1836 }
1837 }
1838#endif /* DBUS_DISABLE_CHECKS */
1839
1840 if (writer->enabled && !is_array_append)
1841 {
1842 /* 3 pad + 4 bytes for the array length, and 4 bytes possible padding
1843 * before array values
1844 */
1845 if (!_dbus_string_alloc_space (sub->value_str, 3 + 4 + 4))
1846 return FALSE;
1847 }
1848
1849 if (writer->type_str != NULL)
1850 {
1851 sub->type_pos += 1; /* move to point to the element type, since type_pos
1852 * should be the expected type for further writes
1853 */
1854 sub->u.array.element_type_pos = sub->type_pos;
1855 }
1856
1857 if (!writer->type_pos_is_expectation)
1858 {
1859 /* sub is a toplevel/outermost array so we need to write the type data */
1860
1861 /* alloc space for array typecode, element signature */
1862 if (!_dbus_string_alloc_space (writer->type_str, 1 + contained_type_len))
1863 return FALSE;
1864
1865 if (!_dbus_string_insert_byte (writer->type_str,
1866 writer->type_pos,
1867 DBUS_TYPE_ARRAY))
1868 _dbus_assert_not_reached ("failed to insert array typecode after prealloc");
1869
1870 if (!_dbus_string_copy_len (contained_type,
1871 contained_type_start, contained_type_len,
1872 sub->type_str,
1873 sub->u.array.element_type_pos))
1874 _dbus_assert_not_reached ("should not have failed to insert array element typecodes");
1875 }
1876
1877 if (writer->type_str != NULL)
1878 {
1879 /* If the parent is an array, we hold type_pos pointing at the array element type;
1880 * otherwise advance it to reflect the array value we just recursed into
1881 */
1882 if (writer->container_type != DBUS_TYPE_ARRAY)
1883 writer->type_pos += 1 + contained_type_len;
1884 else
1885 _dbus_assert (writer->type_pos_is_expectation); /* because it's an array */
1886 }
1887
1888 if (writer->enabled)
1889 {
1890 /* Write (or jump over, if is_array_append) the length */
1891 sub->u.array.len_pos = _DBUS_ALIGN_VALUE (sub->value_pos, 4);
1892
1893 if (is_array_append)
1894 {
1895 sub->value_pos += 4;
1896 }
1897 else
1898 {
1899 if (!_dbus_type_writer_write_basic_no_typecode (sub, DBUS_TYPE_UINT32,
1900 &value))
1901 _dbus_assert_not_reached ("should not have failed to insert array len");
1902 }
1903
1904 _dbus_assert (sub->u.array.len_pos == sub->value_pos - 4);
1905
1906 /* Write alignment padding for array elements
1907 * Note that we write the padding *even for empty arrays*
1908 * to avoid wonky special cases
1909 */
1910 alignment = element_type_get_alignment (contained_type, contained_type_start);
1911
1912 aligned = _DBUS_ALIGN_VALUE (sub->value_pos, alignment);
1913 if (aligned != sub->value_pos)
1914 {
1915 if (!is_array_append)
1916 {
1917 if (!_dbus_string_insert_bytes (sub->value_str,
1918 sub->value_pos,
1919 aligned - sub->value_pos,
1920 '\0'))
1921 _dbus_assert_not_reached ("should not have failed to insert alignment padding");
1922 }
1923
1924 sub->value_pos = aligned;
1925 }
1926
1927 sub->u.array.start_pos = sub->value_pos;
1928
1929 if (is_array_append)
1930 {
1931 dbus_uint32_t len;
1932
1933 _dbus_assert (_DBUS_ALIGN_VALUE (sub->u.array.len_pos, 4) ==
1934 (unsigned) sub->u.array.len_pos);
1935 len = _dbus_unpack_uint32 (sub->byte_order,
1936 _dbus_string_get_const_udata_len (sub->value_str,
1937 sub->u.array.len_pos,
1938 4));
1939
1940 sub->value_pos += len;
1941 }
1942 }
1943 else
1944 {
1945 /* not enabled, so we won't write the len_pos; set it to -1 to so indicate */
1946 sub->u.array.len_pos = -1;
1947 sub->u.array.start_pos = sub->value_pos;
1948 }
1949
1950 _dbus_assert (sub->u.array.len_pos < sub->u.array.start_pos);
1951 _dbus_assert (is_array_append || sub->u.array.start_pos == sub->value_pos);
1952
1953#if RECURSIVE_MARSHAL_WRITE_TRACE
1954 _dbus_verbose (" type writer %p recurse array done remaining sig '%s' array start_pos = %d len_pos = %d value_pos = %d\n", sub,
1955 sub->type_str ?
1956 _dbus_string_get_const_data_len (sub->type_str, sub->type_pos, 0) :
1957 "unknown",
1958 sub->u.array.start_pos, sub->u.array.len_pos, sub->value_pos);
1959#endif
1960
1961 return TRUE;
1962}
1963
1964/* Variant value will normally have:
1965 * 1 byte signature length not including nul
1966 * signature typecodes (nul terminated)
1967 * padding to alignment of contained type
1968 * body according to signature
1969 *
1970 * The signature string can only have a single type
1971 * in it but that type may be complex/recursive.
1972 *
1973 * So a typical variant type with the integer 3 will have these
1974 * octets:
1975 * 0x1 'i' '\0' [1 byte padding to alignment boundary] 0x0 0x0 0x0 0x3
1976 *
1977 * The main world of hurt for writing out a variant is that the type
1978 * string is the same string as the value string. Which means
1979 * inserting to the type string will move the value_pos; and it means
1980 * that inserting to the type string could break type alignment.
1981 */
1982static dbus_bool_t
1983writer_recurse_variant (DBusTypeWriter *writer,
1984 const DBusString *contained_type,
1985 int contained_type_start,
1986 int contained_type_len,
1987 DBusTypeWriter *sub)
1988{
1989 int contained_alignment;
1990
1991 if (writer->enabled)
1992 {
1993 /* Allocate space for the worst case, which is 1 byte sig
1994 * length, nul byte at end of sig, and 7 bytes padding to
1995 * 8-boundary.
1996 */
1997 if (!_dbus_string_alloc_space (sub->value_str, contained_type_len + 9))
1998 return FALSE;
1999 }
2000
2001 /* write VARIANT typecode to the parent's type string */
2002 if (!write_or_verify_typecode (writer, DBUS_TYPE_VARIANT))
2003 return FALSE;
2004
2005 /* If not enabled, mark that we have no type_str anymore ... */
2006
2007 if (!writer->enabled)
2008 {
2009 sub->type_str = NULL;
2010 sub->type_pos = -1;
2011
2012 return TRUE;
2013 }
2014
2015 /* If we're enabled then continue ... */
2016
2017 if (!_dbus_string_insert_byte (sub->value_str,
2018 sub->value_pos,
2019 contained_type_len))
2020 _dbus_assert_not_reached ("should not have failed to insert variant type sig len");
2021
2022 sub->value_pos += 1;
2023
2024 /* Here we switch over to the expected type sig we're about to write */
2025 sub->type_str = sub->value_str;
2026 sub->type_pos = sub->value_pos;
2027
2028 if (!_dbus_string_copy_len (contained_type, contained_type_start, contained_type_len,
2029 sub->value_str, sub->value_pos))
2030 _dbus_assert_not_reached ("should not have failed to insert variant type sig");
2031
2032 sub->value_pos += contained_type_len;
2033
2034 if (!_dbus_string_insert_byte (sub->value_str,
2035 sub->value_pos,
2036 DBUS_TYPE_INVALID))
2037 _dbus_assert_not_reached ("should not have failed to insert variant type nul termination");
2038
2039 sub->value_pos += 1;
2040
2041 contained_alignment = _dbus_type_get_alignment (_dbus_first_type_in_signature (contained_type, contained_type_start));
2042
2043 if (!_dbus_string_insert_bytes (sub->value_str,
2044 sub->value_pos,
2045 _DBUS_ALIGN_VALUE (sub->value_pos, contained_alignment) - sub->value_pos,
2046 '\0'))
2047 _dbus_assert_not_reached ("should not have failed to insert alignment padding for variant body");
2048 sub->value_pos = _DBUS_ALIGN_VALUE (sub->value_pos, contained_alignment);
2049
2050 return TRUE;
2051}
2052
2053static dbus_bool_t
2054_dbus_type_writer_recurse_contained_len (DBusTypeWriter *writer,
2055 int container_type,
2056 const DBusString *contained_type,
2057 int contained_type_start,
2058 int contained_type_len,
2059 DBusTypeWriter *sub,
2060 dbus_bool_t is_array_append)
2061{
2062 writer_recurse_init_and_check (writer, container_type, sub);
2063
2064 switch (container_type)
2065 {
2066 case DBUS_TYPE_STRUCT:
2067 return writer_recurse_struct_or_dict_entry (writer,
2068 DBUS_STRUCT_BEGIN_CHAR,
2069 contained_type,
2070 contained_type_start, contained_type_len,
2071 sub);
2072 break;
2073 case DBUS_TYPE_DICT_ENTRY:
2074 return writer_recurse_struct_or_dict_entry (writer,
2075 DBUS_DICT_ENTRY_BEGIN_CHAR,
2076 contained_type,
2077 contained_type_start, contained_type_len,
2078 sub);
2079 break;
2080 case DBUS_TYPE_ARRAY:
2081 return writer_recurse_array (writer,
2082 contained_type, contained_type_start, contained_type_len,
2083 sub, is_array_append);
2084 break;
2085 case DBUS_TYPE_VARIANT:
2086 return writer_recurse_variant (writer,
2087 contained_type, contained_type_start, contained_type_len,
2088 sub);
2089 break;
2090 default:
2091 _dbus_assert_not_reached ("tried to recurse into type that doesn't support that");
2092 return FALSE;
2093 break;
2094 }
2095}
2096
2107dbus_bool_t
2108_dbus_type_writer_recurse (DBusTypeWriter *writer,
2109 int container_type,
2110 const DBusString *contained_type,
2111 int contained_type_start,
2112 DBusTypeWriter *sub)
2113{
2114 int contained_type_len;
2115
2116 if (contained_type)
2117 contained_type_len = find_len_of_complete_type (contained_type, contained_type_start);
2118 else
2119 contained_type_len = 0;
2120
2121 return _dbus_type_writer_recurse_contained_len (writer, container_type,
2122 contained_type,
2123 contained_type_start,
2124 contained_type_len,
2125 sub,
2126 FALSE);
2127}
2128
2141dbus_bool_t
2142_dbus_type_writer_append_array (DBusTypeWriter *writer,
2143 const DBusString *contained_type,
2144 int contained_type_start,
2145 DBusTypeWriter *sub)
2146{
2147 int contained_type_len;
2148
2149 if (contained_type)
2150 contained_type_len = find_len_of_complete_type (contained_type, contained_type_start);
2151 else
2152 contained_type_len = 0;
2153
2154 return _dbus_type_writer_recurse_contained_len (writer, DBUS_TYPE_ARRAY,
2155 contained_type,
2156 contained_type_start,
2157 contained_type_len,
2158 sub,
2159 TRUE);
2160}
2161
2162static int
2163writer_get_array_len (DBusTypeWriter *writer)
2164{
2165 _dbus_assert (writer->container_type == DBUS_TYPE_ARRAY);
2166 return writer->value_pos - writer->u.array.start_pos;
2167}
2168
2177dbus_bool_t
2178_dbus_type_writer_unrecurse (DBusTypeWriter *writer,
2179 DBusTypeWriter *sub)
2180{
2181 /* type_pos_is_expectation never gets unset once set, or we'd get all hosed */
2182 _dbus_assert (!writer->type_pos_is_expectation ||
2183 (writer->type_pos_is_expectation && sub->type_pos_is_expectation));
2184
2185#if RECURSIVE_MARSHAL_WRITE_TRACE
2186 _dbus_verbose (" type writer %p unrecurse type_pos = %d value_pos = %d is_expectation = %d container_type = %s\n",
2187 writer, writer->type_pos, writer->value_pos, writer->type_pos_is_expectation,
2188 _dbus_type_to_string (writer->container_type));
2189 _dbus_verbose (" type writer %p unrecurse sub type_pos = %d value_pos = %d is_expectation = %d container_type = %s\n",
2190 sub, sub->type_pos, sub->value_pos,
2191 sub->type_pos_is_expectation,
2192 _dbus_type_to_string (sub->container_type));
2193#endif
2194
2195 if (sub->container_type == DBUS_TYPE_STRUCT)
2196 {
2197 if (!write_or_verify_typecode (sub, DBUS_STRUCT_END_CHAR))
2198 return FALSE;
2199 }
2200 else if (sub->container_type == DBUS_TYPE_DICT_ENTRY)
2201 {
2202 if (!write_or_verify_typecode (sub, DBUS_DICT_ENTRY_END_CHAR))
2203 return FALSE;
2204 }
2205 else if (sub->container_type == DBUS_TYPE_ARRAY)
2206 {
2207 if (sub->u.array.len_pos >= 0) /* len_pos == -1 if we weren't enabled when we passed it */
2208 {
2209 dbus_uint32_t len;
2210
2211 /* Set the array length */
2212 len = writer_get_array_len (sub);
2213 _dbus_marshal_set_uint32 (sub->value_str,
2214 sub->u.array.len_pos,
2215 len,
2216 sub->byte_order);
2217#if RECURSIVE_MARSHAL_WRITE_TRACE
2218 _dbus_verbose (" filled in sub array len to %u at len_pos %d\n",
2219 len, sub->u.array.len_pos);
2220#endif
2221 }
2222#if RECURSIVE_MARSHAL_WRITE_TRACE
2223 else
2224 {
2225 _dbus_verbose (" not filling in sub array len because we were disabled when we passed the len\n");
2226 }
2227#endif
2228 }
2229
2230 /* Now get type_pos right for the parent writer. Here are the cases:
2231 *
2232 * Cases !writer->type_pos_is_expectation:
2233 * (in these cases we want to update to the new insertion point)
2234 *
2235 * - if we recursed into a STRUCT then we didn't know in advance
2236 * what the types in the struct would be; so we have to fill in
2237 * that information now.
2238 * writer->type_pos = sub->type_pos
2239 *
2240 * - if we recursed into anything else, we knew the full array
2241 * type, or knew the single typecode marking VARIANT, so
2242 * writer->type_pos is already correct.
2243 * writer->type_pos should remain as-is
2244 *
2245 * - note that the parent is never an ARRAY or VARIANT, if it were
2246 * then type_pos_is_expectation would be TRUE. The parent
2247 * is thus known to be a toplevel or STRUCT.
2248 *
2249 * Cases where writer->type_pos_is_expectation:
2250 * (in these cases we want to update to next expected type to write)
2251 *
2252 * - we recursed from STRUCT into STRUCT and we didn't increment
2253 * type_pos in the parent just to stay consistent with the
2254 * !writer->type_pos_is_expectation case (though we could
2255 * special-case this in recurse_struct instead if we wanted)
2256 * writer->type_pos = sub->type_pos
2257 *
2258 * - we recursed from STRUCT into ARRAY or VARIANT and type_pos
2259 * for parent should have been incremented already
2260 * writer->type_pos should remain as-is
2261 *
2262 * - we recursed from ARRAY into a sub-element, so type_pos in the
2263 * parent is the element type and should remain the element type
2264 * for the benefit of the next child element
2265 * writer->type_pos should remain as-is
2266 *
2267 * - we recursed from VARIANT into its value, so type_pos in the
2268 * parent makes no difference since there's only one value
2269 * and we just finished writing it and won't use type_pos again
2270 * writer->type_pos should remain as-is
2271 *
2272 *
2273 * For all these, DICT_ENTRY is the same as STRUCT
2274 */
2275 if (writer->type_str != NULL)
2276 {
2277 if ((sub->container_type == DBUS_TYPE_STRUCT ||
2278 sub->container_type == DBUS_TYPE_DICT_ENTRY) &&
2279 (writer->container_type == DBUS_TYPE_STRUCT ||
2280 writer->container_type == DBUS_TYPE_DICT_ENTRY ||
2281 writer->container_type == DBUS_TYPE_INVALID))
2282 {
2283 /* Advance the parent to the next struct field */
2284 writer->type_pos = sub->type_pos;
2285 }
2286 }
2287
2288 writer->value_pos = sub->value_pos;
2289
2290#if RECURSIVE_MARSHAL_WRITE_TRACE
2291 _dbus_verbose (" type writer %p unrecursed type_pos = %d value_pos = %d remaining sig '%s'\n",
2292 writer, writer->type_pos, writer->value_pos,
2293 writer->type_str ?
2294 _dbus_string_get_const_data_len (writer->type_str, writer->type_pos, 0) :
2295 "unknown");
2296#endif
2297
2298 return TRUE;
2299}
2300
2309dbus_bool_t
2310_dbus_type_writer_write_basic (DBusTypeWriter *writer,
2311 int type,
2312 const void *value)
2313{
2314 dbus_bool_t retval;
2315
2316 /* First ensure that our type realloc will succeed */
2317 if (!writer->type_pos_is_expectation && writer->type_str != NULL)
2318 {
2319 if (!_dbus_string_alloc_space (writer->type_str, 1))
2320 return FALSE;
2321 }
2322
2323 retval = FALSE;
2324
2325 if (!_dbus_type_writer_write_basic_no_typecode (writer, type, value))
2326 goto out;
2327
2328 if (!write_or_verify_typecode (writer, type))
2329 _dbus_assert_not_reached ("failed to write typecode after prealloc");
2330
2331 retval = TRUE;
2332
2333 out:
2334#if RECURSIVE_MARSHAL_WRITE_TRACE
2335 _dbus_verbose (" type writer %p basic type_pos = %d value_pos = %d is_expectation = %d enabled = %d\n",
2336 writer, writer->type_pos, writer->value_pos, writer->type_pos_is_expectation,
2337 writer->enabled);
2338#endif
2339
2340 return retval;
2341}
2342
2357dbus_bool_t
2358_dbus_type_writer_write_fixed_multi (DBusTypeWriter *writer,
2359 int element_type,
2360 const void *value,
2361 int n_elements)
2362{
2363 _dbus_assert (writer->container_type == DBUS_TYPE_ARRAY);
2364 _dbus_assert (dbus_type_is_fixed (element_type));
2365 _dbus_assert (writer->type_pos_is_expectation);
2366 _dbus_assert (n_elements >= 0);
2367
2368#if RECURSIVE_MARSHAL_WRITE_TRACE
2369 _dbus_verbose (" type writer %p entering fixed multi type_pos = %d value_pos = %d n_elements %d\n",
2370 writer, writer->type_pos, writer->value_pos, n_elements);
2371#endif
2372
2373 if (!write_or_verify_typecode (writer, element_type))
2374 _dbus_assert_not_reached ("OOM should not happen if only verifying typecode");
2375
2376 if (writer->enabled)
2377 {
2378 if (!_dbus_marshal_write_fixed_multi (writer->value_str,
2379 writer->value_pos,
2380 element_type,
2381 value,
2382 n_elements,
2383 writer->byte_order,
2384 &writer->value_pos))
2385 return FALSE;
2386 }
2387
2388#if RECURSIVE_MARSHAL_WRITE_TRACE
2389 _dbus_verbose (" type writer %p fixed multi written new type_pos = %d new value_pos = %d n_elements %d\n",
2390 writer, writer->type_pos, writer->value_pos, n_elements);
2391#endif
2392
2393 return TRUE;
2394}
2395
2396static void
2397enable_if_after (DBusTypeWriter *writer,
2398 DBusTypeReader *reader,
2399 const DBusTypeReader *start_after)
2400{
2401 if (start_after)
2402 {
2403 if (!writer->enabled && _dbus_type_reader_greater_than (reader, start_after))
2404 {
2405 _dbus_type_writer_set_enabled (writer, TRUE);
2406#if RECURSIVE_MARSHAL_WRITE_TRACE
2407 _dbus_verbose ("ENABLING writer %p at %d because reader at value_pos %d is after reader at value_pos %d\n",
2408 writer, writer->value_pos, reader->value_pos, start_after->value_pos);
2409#endif
2410 }
2411
2412 _dbus_assert ((!writer->enabled && !_dbus_type_reader_greater_than (reader, start_after)) ||
2413 (writer->enabled && _dbus_type_reader_greater_than (reader, start_after)));
2414 }
2415}
2416
2417static dbus_bool_t
2418append_fixup (DBusList **fixups,
2419 const DBusArrayLenFixup *fixup)
2420{
2421 DBusArrayLenFixup *f;
2422
2423 f = dbus_new (DBusArrayLenFixup, 1);
2424 if (f == NULL)
2425 return FALSE;
2426
2427 *f = *fixup;
2428
2429 if (!_dbus_list_append (fixups, f))
2430 {
2431 dbus_free (f);
2432 return FALSE;
2433 }
2434
2435 _dbus_assert (f->len_pos_in_reader == fixup->len_pos_in_reader);
2436 _dbus_assert (f->new_len == fixup->new_len);
2437
2438 return TRUE;
2439}
2440
2441/* This loop is trivial if you ignore all the start_after nonsense,
2442 * so if you're trying to figure it out, start by ignoring that
2443 */
2444static dbus_bool_t
2445writer_write_reader_helper (DBusTypeWriter *writer,
2446 DBusTypeReader *reader,
2447 const DBusTypeReader *start_after,
2448 int start_after_new_pos,
2449 int start_after_new_len,
2450 DBusList **fixups,
2451 dbus_bool_t inside_start_after)
2452{
2453 int current_type;
2454
2455 while ((current_type = _dbus_type_reader_get_current_type (reader)) != DBUS_TYPE_INVALID)
2456 {
2457 if (dbus_type_is_container (current_type))
2458 {
2459 DBusTypeReader subreader;
2460 DBusTypeWriter subwriter;
2461 const DBusString *sig_str;
2462 int sig_start;
2463 int sig_len;
2464 dbus_bool_t enabled_at_recurse;
2465 dbus_bool_t past_start_after;
2466 int reader_array_len_pos;
2467 int reader_array_start_pos;
2468 dbus_bool_t this_is_start_after;
2469
2470 /* type_pos is checked since e.g. in a struct the struct
2471 * and its first field have the same value_pos.
2472 * type_str will differ in reader/start_after for variants
2473 * where type_str is inside the value_str
2474 */
2475 if (!inside_start_after && start_after &&
2476 reader->value_pos == start_after->value_pos &&
2477 reader->type_str == start_after->type_str &&
2478 reader->type_pos == start_after->type_pos)
2479 this_is_start_after = TRUE;
2480 else
2481 this_is_start_after = FALSE;
2482
2483 _dbus_type_reader_recurse (reader, &subreader);
2484
2485 if (current_type == DBUS_TYPE_ARRAY)
2486 {
2487 reader_array_len_pos = ARRAY_READER_LEN_POS (&subreader);
2488 reader_array_start_pos = subreader.u.array.start_pos;
2489 }
2490 else
2491 {
2492 /* quiet gcc */
2493 reader_array_len_pos = -1;
2494 reader_array_start_pos = -1;
2495 }
2496
2497 _dbus_type_reader_get_signature (&subreader, &sig_str,
2498 &sig_start, &sig_len);
2499
2500#if RECURSIVE_MARSHAL_WRITE_TRACE
2501 _dbus_verbose ("about to recurse into %s reader at %d subreader at %d writer at %d start_after reader at %d write target len %d inside_start_after = %d this_is_start_after = %d\n",
2502 _dbus_type_to_string (current_type),
2503 reader->value_pos,
2504 subreader.value_pos,
2505 writer->value_pos,
2506 start_after ? start_after->value_pos : -1,
2507 _dbus_string_get_length (writer->value_str),
2508 inside_start_after, this_is_start_after);
2509#endif
2510
2511 if (!inside_start_after && !this_is_start_after)
2512 enable_if_after (writer, &subreader, start_after);
2513 enabled_at_recurse = writer->enabled;
2514 if (!_dbus_type_writer_recurse_contained_len (writer, current_type,
2515 sig_str, sig_start, sig_len,
2516 &subwriter, FALSE))
2517 goto oom;
2518
2519#if RECURSIVE_MARSHAL_WRITE_TRACE
2520 _dbus_verbose ("recursed into subwriter at %d write target len %d\n",
2521 subwriter.value_pos,
2522 _dbus_string_get_length (subwriter.value_str));
2523#endif
2524
2525 if (!writer_write_reader_helper (&subwriter, &subreader, start_after,
2526 start_after_new_pos, start_after_new_len,
2527 fixups,
2528 inside_start_after ||
2529 this_is_start_after))
2530 goto oom;
2531
2532#if RECURSIVE_MARSHAL_WRITE_TRACE
2533 _dbus_verbose ("about to unrecurse from %s subreader at %d writer at %d subwriter at %d write target len %d\n",
2534 _dbus_type_to_string (current_type),
2535 subreader.value_pos,
2536 writer->value_pos,
2537 subwriter.value_pos,
2538 _dbus_string_get_length (writer->value_str));
2539#endif
2540
2541 if (!inside_start_after && !this_is_start_after)
2542 enable_if_after (writer, &subreader, start_after);
2543 past_start_after = writer->enabled;
2544 if (!_dbus_type_writer_unrecurse (writer, &subwriter))
2545 goto oom;
2546
2547 /* If we weren't enabled when we recursed, we didn't
2548 * write an array len; if we passed start_after
2549 * somewhere inside the array, then we need to generate
2550 * a fixup.
2551 */
2552 if (start_after != NULL &&
2553 !enabled_at_recurse && past_start_after &&
2554 current_type == DBUS_TYPE_ARRAY &&
2555 fixups != NULL)
2556 {
2557 DBusArrayLenFixup fixup;
2558 int bytes_written_after_start_after;
2559 int bytes_before_start_after;
2560 int old_len;
2561
2562 /* this subwriter access is moderately unkosher since we
2563 * already unrecursed, but it works as long as unrecurse
2564 * doesn't break us on purpose
2565 */
2566 bytes_written_after_start_after = writer_get_array_len (&subwriter);
2567
2568 bytes_before_start_after =
2569 start_after->value_pos - reader_array_start_pos;
2570
2571 fixup.len_pos_in_reader = reader_array_len_pos;
2572 fixup.new_len =
2573 bytes_before_start_after +
2574 start_after_new_len +
2575 bytes_written_after_start_after;
2576
2577 _dbus_assert (_DBUS_ALIGN_VALUE (fixup.len_pos_in_reader, 4) ==
2578 (unsigned) fixup.len_pos_in_reader);
2579
2580 old_len = _dbus_unpack_uint32 (reader->byte_order,
2581 _dbus_string_get_const_udata_len (reader->value_str,
2582 fixup.len_pos_in_reader, 4));
2583
2584 if (old_len != fixup.new_len && !append_fixup (fixups, &fixup))
2585 goto oom;
2586
2587#if RECURSIVE_MARSHAL_WRITE_TRACE
2588 _dbus_verbose ("Generated fixup len_pos_in_reader = %d new_len = %d reader_array_start_pos = %d start_after->value_pos = %d bytes_before_start_after = %d start_after_new_len = %d bytes_written_after_start_after = %d\n",
2589 fixup.len_pos_in_reader,
2590 fixup.new_len,
2591 reader_array_start_pos,
2592 start_after->value_pos,
2593 bytes_before_start_after,
2594 start_after_new_len,
2595 bytes_written_after_start_after);
2596#endif
2597 }
2598 }
2599 else
2600 {
2601 DBusBasicValue val;
2602
2603 _dbus_assert (dbus_type_is_basic (current_type));
2604
2605#if RECURSIVE_MARSHAL_WRITE_TRACE
2606 _dbus_verbose ("Reading basic value %s at %d\n",
2607 _dbus_type_to_string (current_type),
2608 reader->value_pos);
2609#endif
2610
2611 _dbus_type_reader_read_basic (reader, &val);
2612
2613#if RECURSIVE_MARSHAL_WRITE_TRACE
2614 _dbus_verbose ("Writing basic value %s at %d write target len %d inside_start_after = %d\n",
2615 _dbus_type_to_string (current_type),
2616 writer->value_pos,
2617 _dbus_string_get_length (writer->value_str),
2618 inside_start_after);
2619#endif
2620 if (!inside_start_after)
2621 enable_if_after (writer, reader, start_after);
2622 if (!_dbus_type_writer_write_basic (writer, current_type, &val))
2623 goto oom;
2624#if RECURSIVE_MARSHAL_WRITE_TRACE
2625 _dbus_verbose ("Wrote basic value %s, new value_pos %d write target len %d\n",
2626 _dbus_type_to_string (current_type),
2627 writer->value_pos,
2628 _dbus_string_get_length (writer->value_str));
2629#endif
2630 }
2631
2632 _dbus_type_reader_next (reader);
2633 }
2634
2635 return TRUE;
2636
2637 oom:
2638 if (fixups)
2639 apply_and_free_fixups (fixups, NULL); /* NULL for reader to apply to */
2640
2641 return FALSE;
2642}
2643
2644/*
2645 * Iterate through all values in the given reader, writing a copy of
2646 * each value to the writer. The reader will be moved forward to its
2647 * end position.
2648 *
2649 * If a reader start_after is provided, it should be a reader for the
2650 * same data as the reader to be written. Only values occurring after
2651 * the value pointed to by start_after will be written to the writer.
2652 *
2653 * If start_after is provided, then the copy of the reader will be
2654 * partial. This means that array lengths will not have been copied.
2655 * The assumption is that you wrote a new version of the value at
2656 * start_after to the writer. You have to pass in the start position
2657 * and length of the new value. (If you are deleting the value
2658 * at start_after, pass in 0 for the length.)
2659 *
2660 * If the fixups parameter is non-#NULL, then any array length that
2661 * was read but not written due to start_after will be provided
2662 * as a #DBusArrayLenFixup. The fixup contains the position of the
2663 * array length in the source data, and the correct array length
2664 * assuming you combine the source data before start_after with
2665 * the written data at start_after and beyond.
2666 *
2667 * @param writer the writer to copy to
2668 * @param reader the reader to copy from
2669 * @param start_after #NULL or a reader showing where to start
2670 * @param start_after_new_pos the position of start_after equivalent in the target data
2671 * @param start_after_new_len the length of start_after equivalent in the target data
2672 * @param fixups list to append #DBusArrayLenFixup if the write was partial
2673 * @returns #FALSE if no memory
2674 */
2675static dbus_bool_t
2676_dbus_type_writer_write_reader_partial (DBusTypeWriter *writer,
2677 DBusTypeReader *reader,
2678 const DBusTypeReader *start_after,
2679 int start_after_new_pos,
2680 int start_after_new_len,
2681 DBusList **fixups)
2682{
2683 DBusTypeWriter orig;
2684 int orig_type_len;
2685 int orig_value_len;
2686 int new_bytes;
2687 int orig_enabled;
2688
2689 orig = *writer;
2690 orig_type_len = _dbus_string_get_length (writer->type_str);
2691 orig_value_len = _dbus_string_get_length (writer->value_str);
2692 orig_enabled = writer->enabled;
2693
2694 if (start_after)
2695 _dbus_type_writer_set_enabled (writer, FALSE);
2696
2697 if (!writer_write_reader_helper (writer, reader, start_after,
2698 start_after_new_pos,
2699 start_after_new_len,
2700 fixups, FALSE))
2701 goto oom;
2702
2703 _dbus_type_writer_set_enabled (writer, orig_enabled);
2704 return TRUE;
2705
2706 oom:
2707 if (!writer->type_pos_is_expectation)
2708 {
2709 new_bytes = _dbus_string_get_length (writer->type_str) - orig_type_len;
2710 _dbus_string_delete (writer->type_str, orig.type_pos, new_bytes);
2711 }
2712 new_bytes = _dbus_string_get_length (writer->value_str) - orig_value_len;
2713 _dbus_string_delete (writer->value_str, orig.value_pos, new_bytes);
2714
2715 *writer = orig;
2716
2717 return FALSE;
2718}
2719
2729dbus_bool_t
2730_dbus_type_writer_write_reader (DBusTypeWriter *writer,
2731 DBusTypeReader *reader)
2732{
2733 return _dbus_type_writer_write_reader_partial (writer, reader, NULL, 0, 0, NULL);
2734}
2735
2736/*
2737 * If disabled, a writer can still be iterated forward and recursed/unrecursed
2738 * but won't write any values. Types will still be written unless the
2739 * writer is a "values only" writer, because the writer needs access to
2740 * a valid signature to be able to iterate.
2741 *
2742 * @param writer the type writer
2743 * @param enabled #TRUE if values should be written
2744 */
2745static void
2746_dbus_type_writer_set_enabled (DBusTypeWriter *writer,
2747 dbus_bool_t enabled)
2748{
2749 writer->enabled = enabled != FALSE;
2750}
2751 /* end of DBusMarshal group */
2753
2754/* tests in dbus-marshal-recursive-util.c */
_dbus_assert_not_reached
#define _dbus_assert_not_reached(explanation)
Aborts with an error message if called.
Definition dbus-internals.h:164
_dbus_assert
#define _dbus_assert(condition)
Aborts with an error message if the condition is false.
Definition dbus-internals.h:153
_DBUS_INT_MAX
#define _DBUS_INT_MAX
Maximum value of type "int".
Definition dbus-internals.h:327
_dbus_warn_check_failed
void _dbus_warn_check_failed(const char *format,...)
Prints a "critical" warning to stderr when an assertion fails; differs from _dbus_warn primarily in t...
Definition dbus-internals.c:310
_DBUS_ZERO
#define _DBUS_ZERO(object)
Sets all bits in an object to zero.
Definition dbus-internals.h:194
_dbus_list_get_first_link
DBusList * _dbus_list_get_first_link(DBusList **list)
Gets the first link in the list.
Definition dbus-list.c:597
_dbus_list_free_link
void _dbus_list_free_link(DBusList *link)
Frees a linked list node allocated with _dbus_list_alloc_link.
Definition dbus-list.c:257
_dbus_list_get_length
int _dbus_list_get_length(DBusList **list)
Gets the length of a list.
Definition dbus-list.c:760
_dbus_list_append
dbus_bool_t _dbus_list_append(DBusList **list, void *data)
Appends a value to the list.
Definition dbus-list.c:273
_dbus_list_get_next_link
#define _dbus_list_get_next_link(list, link)
Gets the next link in the list, or NULL if there are no more links.
Definition dbus-list.h:121
NULL
#define NULL
A null pointer, defined appropriately for C or C++.
Definition dbus-macros.h:51
TRUE
#define TRUE
Expands to "1".
Definition dbus-macros.h:41
FALSE
#define FALSE
Expands to "0".
Definition dbus-macros.h:44
_dbus_type_writer_write_basic
dbus_bool_t _dbus_type_writer_write_basic(DBusTypeWriter *writer, int type, const void *value)
Writes out a basic type.
Definition dbus-marshal-recursive.c:2310
_dbus_type_reader_recurse
void _dbus_type_reader_recurse(DBusTypeReader *reader, DBusTypeReader *sub)
Initialize a new reader pointing to the first type and corresponding value that's a child of the curr...
Definition dbus-marshal-recursive.c:987
_dbus_type_writer_init_values_only
void _dbus_type_writer_init_values_only(DBusTypeWriter *writer, int byte_order, const DBusString *type_str, int type_pos, DBusString *value_str, int value_pos)
Like _dbus_type_writer_init(), except the type string passed in should correspond to an existing sign...
Definition dbus-marshal-recursive.c:1583
_dbus_type_reader_get_value_pos
int _dbus_type_reader_get_value_pos(const DBusTypeReader *reader)
Gets the current position in the value block.
Definition dbus-marshal-recursive.c:837
_dbus_type_get_alignment
int _dbus_type_get_alignment(int typecode)
Gets the alignment requirement for the given type; will be 1, 2, 4, or 8.
Definition dbus-marshal-basic.c:1244
_dbus_type_writer_remove_types
void _dbus_type_writer_remove_types(DBusTypeWriter *writer)
Removes type string from the writer.
Definition dbus-marshal-recursive.c:1562
_dbus_type_reader_init
void _dbus_type_reader_init(DBusTypeReader *reader, int byte_order, const DBusString *type_str, int type_pos, const DBusString *value_str, int value_pos)
Initializes a type reader.
Definition dbus-marshal-recursive.c:732
_dbus_verbose_bytes_of_string
DBUS_PRIVATE_EXPORT void _dbus_verbose_bytes_of_string(const DBusString *str, int start, int len)
Dump the given part of the string to verbose log.
Definition dbus-marshal-basic.c:1428
_dbus_type_reader_init_types_only
void _dbus_type_reader_init_types_only(DBusTypeReader *reader, const DBusString *type_str, int type_pos)
Like _dbus_type_reader_init() but the iteration is over the signature, not over values.
Definition dbus-marshal-recursive.c:760
_dbus_type_reader_get_signature
void _dbus_type_reader_get_signature(const DBusTypeReader *reader, const DBusString **str_p, int *start_p, int *len_p)
Gets the string and range of said string containing the signature of the current value.
Definition dbus-marshal-recursive.c:1124
_dbus_type_writer_write_reader
dbus_bool_t _dbus_type_writer_write_reader(DBusTypeWriter *writer, DBusTypeReader *reader)
Iterate through all values in the given reader, writing a copy of each value to the writer.
Definition dbus-marshal-recursive.c:2730
_dbus_marshal_set_uint32
void _dbus_marshal_set_uint32(DBusString *str, int pos, dbus_uint32_t value, int byte_order)
Sets the 4 bytes at the given offset to a marshaled unsigned integer, replacing anything found there ...
Definition dbus-marshal-basic.c:260
_dbus_type_writer_recurse
dbus_bool_t _dbus_type_writer_recurse(DBusTypeWriter *writer, int container_type, const DBusString *contained_type, int contained_type_start, DBusTypeWriter *sub)
Opens a new container and writes out the initial information for that container.
Definition dbus-marshal-recursive.c:2108
_dbus_unpack_uint32
dbus_uint32_t _dbus_unpack_uint32(int byte_order, const unsigned char *data)
Unpacks a 32 bit unsigned integer from a data pointer.
Definition dbus-marshal-basic.c:189
_dbus_marshal_write_basic
dbus_bool_t _dbus_marshal_write_basic(DBusString *str, int insert_at, int type, const void *value, int byte_order, int *pos_after)
Marshals a basic-typed value.
Definition dbus-marshal-basic.c:817
_dbus_first_type_in_signature
int _dbus_first_type_in_signature(const DBusString *str, int pos)
Get the first type in the signature.
Definition dbus-marshal-basic.c:1484
_dbus_type_reader_read_fixed_multi
void _dbus_type_reader_read_fixed_multi(const DBusTypeReader *reader, const void **value, int *n_elements)
Reads a block of fixed-length basic values, from the current point in an array to the end of the arra...
Definition dbus-marshal-recursive.c:923
_dbus_marshal_read_uint32
dbus_uint32_t _dbus_marshal_read_uint32(const DBusString *str, int pos, int byte_order, int *new_pos)
Convenience function to demarshal a 32 bit unsigned integer.
Definition dbus-marshal-basic.c:476
_dbus_type_reader_get_element_type
int _dbus_type_reader_get_element_type(const DBusTypeReader *reader)
Gets the type of an element of the array the reader is currently pointing to.
Definition dbus-marshal-recursive.c:820
_dbus_type_reader_next
dbus_bool_t _dbus_type_reader_next(DBusTypeReader *reader)
Skip to the next value on this "level".
Definition dbus-marshal-recursive.c:1053
_dbus_type_reader_get_array_length
int _dbus_type_reader_get_array_length(const DBusTypeReader *reader)
Returns the number of bytes in the array.
Definition dbus-marshal-recursive.c:899
_dbus_marshal_set_basic
dbus_bool_t _dbus_marshal_set_basic(DBusString *str, int pos, int type, const void *value, int byte_order, int *old_end_pos, int *new_end_pos)
Sets an existing basic type value to a new value.
Definition dbus-marshal-basic.c:377
_dbus_type_writer_add_types
void _dbus_type_writer_add_types(DBusTypeWriter *writer, DBusString *type_str, int type_pos)
Adds type string to the writer, if it had none.
Definition dbus-marshal-recursive.c:1545
_dbus_marshal_skip_array
void _dbus_marshal_skip_array(const DBusString *str, int element_type, int byte_order, int *pos)
Skips an array, returning the next position.
Definition dbus-marshal-basic.c:1205
_dbus_type_reader_has_next
dbus_bool_t _dbus_type_reader_has_next(const DBusTypeReader *reader)
Check whether there's another value on this "level".
Definition dbus-marshal-recursive.c:1093
_dbus_marshal_write_fixed_multi
dbus_bool_t _dbus_marshal_write_fixed_multi(DBusString *str, int insert_at, int element_type, const void *value, int n_elements, int byte_order, int *pos_after)
Marshals a block of values of fixed-length type all at once, as an optimization.
Definition dbus-marshal-basic.c:1059
_dbus_type_reader_delete
dbus_bool_t _dbus_type_reader_delete(DBusTypeReader *reader, const DBusTypeReader *realign_root)
Recursively deletes any value pointed to by the reader, leaving the reader valid to continue reading.
Definition dbus-marshal-recursive.c:1419
_dbus_type_reader_read_basic
void _dbus_type_reader_read_basic(const DBusTypeReader *reader, void *value)
Reads a basic-typed value, as with _dbus_marshal_read_basic().
Definition dbus-marshal-recursive.c:869
_dbus_type_writer_init_types_delayed
void _dbus_type_writer_init_types_delayed(DBusTypeWriter *writer, int byte_order, DBusString *value_str, int value_pos)
Initialize a write iterator, with the signature to be provided later.
Definition dbus-marshal-recursive.c:1527
_dbus_type_to_string
const char * _dbus_type_to_string(int typecode)
Returns a string describing the given type.
Definition dbus-marshal-basic.c:1290
_dbus_type_reader_set_basic
dbus_bool_t _dbus_type_reader_set_basic(DBusTypeReader *reader, const void *value, const DBusTypeReader *realign_root)
Sets a new value for the basic type value pointed to by the reader, leaving the reader valid to conti...
Definition dbus-marshal-recursive.c:1362
_dbus_marshal_read_basic
void _dbus_marshal_read_basic(const DBusString *str, int pos, int type, void *value, int byte_order, int *new_pos)
Demarshals a basic-typed value.
Definition dbus-marshal-basic.c:514
_dbus_type_reader_get_current_type
int _dbus_type_reader_get_current_type(const DBusTypeReader *reader)
Gets the type of the value the reader is currently pointing to; or for a types-only reader gets the t...
Definition dbus-marshal-recursive.c:785
_dbus_type_reader_read_raw
void _dbus_type_reader_read_raw(const DBusTypeReader *reader, const unsigned char **value_location)
Get the address of the marshaled value in the data being read.
Definition dbus-marshal-recursive.c:852
_dbus_type_writer_unrecurse
dbus_bool_t _dbus_type_writer_unrecurse(DBusTypeWriter *writer, DBusTypeWriter *sub)
Closes a container created by _dbus_type_writer_recurse() and writes any additional information to th...
Definition dbus-marshal-recursive.c:2178
_dbus_type_writer_append_array
dbus_bool_t _dbus_type_writer_append_array(DBusTypeWriter *writer, const DBusString *contained_type, int contained_type_start, DBusTypeWriter *sub)
Append to an existing array.
Definition dbus-marshal-recursive.c:2142
ARRAY_READER_LEN_POS
#define ARRAY_READER_LEN_POS(reader)
compute position of array length given array_len_offset, which is the offset back from start_pos to e...
Definition dbus-marshal-recursive.c:216
_dbus_type_writer_write_fixed_multi
dbus_bool_t _dbus_type_writer_write_fixed_multi(DBusTypeWriter *writer, int element_type, const void *value, int n_elements)
Writes a block of fixed-length basic values, i.e.
Definition dbus-marshal-recursive.c:2358
_dbus_type_writer_init
void _dbus_type_writer_init(DBusTypeWriter *writer, int byte_order, DBusString *type_str, int type_pos, DBusString *value_str, int value_pos)
Initialize a write iterator, which is used to write out values in serialized D-Bus format.
Definition dbus-marshal-recursive.c:1492
_dbus_type_signature_next
void _dbus_type_signature_next(const char *type_str, int *type_pos)
Skips to the next "complete" type inside a type signature.
Definition dbus-marshal-recursive.c:340
_dbus_marshal_skip_basic
void _dbus_marshal_skip_basic(const DBusString *str, int type, int byte_order, int *pos)
Skips over a basic-typed value, reporting the following position.
Definition dbus-marshal-basic.c:1130
dbus_free
void dbus_free(void *memory)
Frees a block of memory previously allocated by dbus_malloc() or dbus_malloc0().
Definition dbus-memory.c:710
dbus_new
#define dbus_new(type, count)
Safe macro for using dbus_malloc().
Definition dbus-memory.h:59
DBUS_DICT_ENTRY_END_CHAR
#define DBUS_DICT_ENTRY_END_CHAR
Code marking the end of a dict entry type in a type signature.
Definition dbus-protocol.h:170
DBUS_TYPE_VARIANT
#define DBUS_TYPE_VARIANT
Type code marking a D-Bus variant type.
Definition dbus-protocol.h:126
DBUS_STRUCT_BEGIN_CHAR
#define DBUS_STRUCT_BEGIN_CHAR
Code marking the start of a struct type in a type signature.
Definition dbus-protocol.h:158
DBUS_TYPE_ARRAY
#define DBUS_TYPE_ARRAY
Type code marking a D-Bus array type.
Definition dbus-protocol.h:122
DBUS_TYPE_INVALID
#define DBUS_TYPE_INVALID
Type code that is never equal to a legitimate type code.
Definition dbus-protocol.h:62
DBUS_TYPE_DICT_ENTRY
#define DBUS_TYPE_DICT_ENTRY
Type code used to represent a dict entry; however, this type code does not appear in type signatures,...
Definition dbus-protocol.h:145
DBUS_DICT_ENTRY_BEGIN_CHAR
#define DBUS_DICT_ENTRY_BEGIN_CHAR
Code marking the start of a dict entry type in a type signature.
Definition dbus-protocol.h:166
DBUS_TYPE_STRUCT
#define DBUS_TYPE_STRUCT
STRUCT and DICT_ENTRY are sort of special since their codes can't appear in a type string,...
Definition dbus-protocol.h:138
DBUS_STRUCT_END_CHAR
#define DBUS_STRUCT_END_CHAR
Code marking the end of a struct type in a type signature.
Definition dbus-protocol.h:162
DBUS_TYPE_UINT32
#define DBUS_TYPE_UINT32
Type code marking a 32-bit unsigned integer.
Definition dbus-protocol.h:88
dbus_type_is_basic
dbus_bool_t dbus_type_is_basic(int typecode)
A "basic type" is a somewhat arbitrary concept, but the intent is to include those types that are ful...
Definition dbus-signature.c:324
dbus_type_is_fixed
dbus_bool_t dbus_type_is_fixed(int typecode)
Tells you whether values of this type can change length if you set them to some other value.
Definition dbus-signature.c:355
dbus_type_is_container
dbus_bool_t dbus_type_is_container(int typecode)
A "container type" can contain basic types, or nested container types.
Definition dbus-signature.c:300
_dbus_string_set_length
dbus_bool_t _dbus_string_set_length(DBusString *str, int length)
Sets the length of a string.
Definition dbus-string.c:847
_dbus_string_equal_substring
dbus_bool_t _dbus_string_equal_substring(const DBusString *a, int a_start, int a_len, const DBusString *b, int b_start)
Tests two sub-parts of two DBusString for equality.
Definition dbus-string.c:2166
_dbus_string_init
dbus_bool_t _dbus_string_init(DBusString *str)
Initializes a string.
Definition dbus-string.c:182
_dbus_string_alloc_space
dbus_bool_t _dbus_string_alloc_space(DBusString *str, int extra_bytes)
Preallocate extra_bytes such that a future lengthening of the string by extra_bytes is guaranteed to ...
Definition dbus-string.c:944
_dbus_string_free
void _dbus_string_free(DBusString *str)
Frees a string created by _dbus_string_init(), and fills it with the same contents as _DBUS_STRING_IN...
Definition dbus-string.c:278
_dbus_string_delete
void _dbus_string_delete(DBusString *str, int start, int len)
Deletes a segment of a DBusString with length len starting at start.
Definition dbus-string.c:1255
_dbus_string_lengthen
dbus_bool_t _dbus_string_lengthen(DBusString *str, int additional_length)
Makes a string longer by the given number of bytes.
Definition dbus-string.c:805
_dbus_string_insert_bytes
dbus_bool_t _dbus_string_insert_bytes(DBusString *str, int i, int n_bytes, unsigned char byte)
Inserts a number of bytes of a given value at the given position.
Definition dbus-string.c:629
_dbus_string_insert_byte
dbus_bool_t _dbus_string_insert_byte(DBusString *str, int i, unsigned char byte)
Inserts a single byte at the given position.
Definition dbus-string.c:659
_dbus_string_copy_len
dbus_bool_t _dbus_string_copy_len(const DBusString *source, int start, int len, DBusString *dest, int insert_at)
Like _dbus_string_copy(), but can copy a segment from the middle of the source string.
Definition dbus-string.c:1437
_dbus_string_replace_len
dbus_bool_t _dbus_string_replace_len(const DBusString *source, int start, int len, DBusString *dest, int replace_at, int replace_len)
Replaces a segment of dest string with a segment of source string.
Definition dbus-string.c:1466
DBusArrayLenFixup
When modifying an existing block of values, array lengths may need to be adjusted; those adjustments ...
Definition dbus-marshal-recursive.h:97
DBusArrayLenFixup::new_len
int new_len
the new value of the length in the written-out block
Definition dbus-marshal-recursive.h:99
DBusArrayLenFixup::len_pos_in_reader
int len_pos_in_reader
where the length was in the original block
Definition dbus-marshal-recursive.h:98
DBusList
A node in a linked list.
Definition dbus-list.h:37
DBusList::data
void * data
Data stored at this element.
Definition dbus-list.h:40
DBusString
Definition dbus-string.h:47
DBusTypeReaderClass
Virtual table for a type reader.
Definition dbus-marshal-recursive.c:128
DBusTypeReaderClass::next
void(* next)(DBusTypeReader *reader, int current_type)
go to the next value
Definition dbus-marshal-recursive.c:135
DBusTypeReaderClass::id
int id
index in all_reader_classes
Definition dbus-marshal-recursive.c:130
DBusTypeReaderClass::check_finished
dbus_bool_t(* check_finished)(const DBusTypeReader *reader)
check whether reader is at the end
Definition dbus-marshal-recursive.c:134
DBusTypeReaderClass::recurse
void(* recurse)(DBusTypeReader *sub, DBusTypeReader *parent)
recurse with this reader as sub
Definition dbus-marshal-recursive.c:132
DBusTypeReaderClass::types_only
dbus_bool_t types_only
only iterates over types, not values
Definition dbus-marshal-recursive.c:131
DBusTypeReaderClass::name
const char * name
name for debugging
Definition dbus-marshal-recursive.c:129
DBusTypeReader
The type reader is an iterator for reading values from a block of values.
Definition dbus-marshal-recursive.h:42
DBusTypeReader::type_pos
int type_pos
current position in signature
Definition dbus-marshal-recursive.h:53
DBusTypeReader::klass
const DBusTypeReaderClass * klass
the vtable for the reader
Definition dbus-marshal-recursive.h:43
DBusTypeReader::u
union DBusTypeReader::@1 u
class-specific data
DBusTypeReader::value_str
const DBusString * value_str
string containing values of block
Definition dbus-marshal-recursive.h:45
DBusTypeReader::finished
dbus_uint32_t finished
marks we're at end iterator for cases where we don't have another way to tell
Definition dbus-marshal-recursive.h:49
DBusTypeReader::start_pos
int start_pos
for array readers, the start of the array values
Definition dbus-marshal-recursive.h:59
DBusTypeReader::array_len_offset
dbus_uint32_t array_len_offset
bytes back from start_pos that len ends
Definition dbus-marshal-recursive.h:52
DBusTypeReader::value_pos
int value_pos
current position in values
Definition dbus-marshal-recursive.h:54
DBusTypeReader::byte_order
dbus_uint32_t byte_order
byte order of the block
Definition dbus-marshal-recursive.h:47
DBusTypeReader::type_str
const DBusString * type_str
string containing signature of block
Definition dbus-marshal-recursive.h:44
DBusTypeWriter
The type writer is an iterator for writing to a block of values.
Definition dbus-marshal-recursive.h:68
DBusTypeWriter::element_type_pos
int element_type_pos
position of array element type in type_str
Definition dbus-marshal-recursive.h:87
DBusTypeWriter::start_pos
int start_pos
position of first element in the array
Definition dbus-marshal-recursive.h:85
DBusTypeWriter::value_pos
int value_pos
next position to write
Definition dbus-marshal-recursive.h:80
DBusTypeWriter::enabled
dbus_uint32_t enabled
whether to write values
Definition dbus-marshal-recursive.h:77
DBusTypeWriter::u
union DBusTypeWriter::@3 u
class-specific data
DBusTypeWriter::byte_order
dbus_uint32_t byte_order
byte order to write values with
Definition dbus-marshal-recursive.h:71
DBusTypeWriter::type_pos
int type_pos
current pos in type_str
Definition dbus-marshal-recursive.h:79
DBusTypeWriter::type_str
DBusString * type_str
where to write typecodes (or read type expectations)
Definition dbus-marshal-recursive.h:69
DBusTypeWriter::len_pos
int len_pos
position of length of the array
Definition dbus-marshal-recursive.h:86
DBusTypeWriter::value_str
DBusString * value_str
where to write values
Definition dbus-marshal-recursive.h:70
DBusTypeWriter::container_type
dbus_uint32_t container_type
what are we inside? (e.g.
Definition dbus-marshal-recursive.h:73
DBusTypeWriter::type_pos_is_expectation
dbus_uint32_t type_pos_is_expectation
type_pos can be either an insertion point for or an expected next type
Definition dbus-marshal-recursive.h:75
ReplacementBlock
Definition dbus-marshal-recursive.c:1135
ReplacementBlock::padding
int padding
How much of the replacement block is padding.
Definition dbus-marshal-recursive.c:1137
ReplacementBlock::replacement
DBusString replacement
Marshaled value including alignment padding.
Definition dbus-marshal-recursive.c:1136
DBusBasicValue
A simple value union that lets you access bytes as if they were various types; useful when dealing wi...
Definition dbus-types.h:161