1 /* -*- mode: C; c-file-style: "gnu" -*- */
2 /* dbus-marshal-recursive.c Marshalling routines for recursive types
4 * Copyright (C) 2004, 2005 Red Hat, Inc.
6 * Licensed under the Academic Free License version 2.1
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 #include "dbus-marshal-recursive.h"
25 #include "dbus-marshal-basic.h"
26 #include "dbus-internals.h"
29 * @addtogroup DBusMarshal
33 /** turn this on to get deluged in TypeReader verbose spam */
34 #define RECURSIVE_MARSHAL_READ_TRACE 0
36 /** turn this on to get deluged in TypeWriter verbose spam */
37 #define RECURSIVE_MARSHAL_WRITE_TRACE 0
40 free_fixups (DBusList **fixups)
44 link = _dbus_list_get_first_link (fixups);
49 next = _dbus_list_get_next_link (fixups, link);
51 dbus_free (link->data);
52 _dbus_list_free_link (link);
61 apply_and_free_fixups (DBusList **fixups,
62 DBusTypeReader *reader)
66 #if RECURSIVE_MARSHAL_WRITE_TRACE
68 _dbus_verbose (" %d FIXUPS to apply\n",
69 _dbus_list_get_length (fixups));
72 link = _dbus_list_get_first_link (fixups);
77 next = _dbus_list_get_next_link (fixups, link);
85 #if RECURSIVE_MARSHAL_WRITE_TRACE
86 _dbus_verbose (" applying FIXUP to reader %p at pos %d new_len = %d old len %d\n",
87 reader, f->len_pos_in_reader, f->new_len,
88 _dbus_marshal_read_uint32 (reader->value_str,
90 reader->byte_order, NULL));
93 _dbus_marshal_set_uint32 ((DBusString*) reader->value_str,
99 dbus_free (link->data);
100 _dbus_list_free_link (link);
109 * Virtual table for a type reader.
111 struct DBusTypeReaderClass
113 const char *name; /**< name for debugging */
114 int id; /**< index in all_reader_classes */
115 dbus_bool_t types_only; /**< only iterates over types, not values */
116 void (* recurse) (DBusTypeReader *sub,
117 DBusTypeReader *parent); /**< recurse with this reader as sub */
118 dbus_bool_t (* check_finished) (const DBusTypeReader *reader); /**< check whether reader is at the end */
119 void (* next) (DBusTypeReader *reader,
120 int current_type); /**< go to the next value */
121 void (* init_from_mark) (DBusTypeReader *reader,
122 const DBusTypeMark *mark); /**< uncompress from a mark */
126 element_type_get_alignment (const DBusString *str,
129 return _dbus_type_get_alignment (_dbus_first_type_in_signature (str, pos));
133 reader_init (DBusTypeReader *reader,
135 const DBusString *type_str,
137 const DBusString *value_str,
140 reader->byte_order = byte_order;
141 reader->finished = FALSE;
142 reader->type_str = type_str;
143 reader->type_pos = type_pos;
144 reader->value_str = value_str;
145 reader->value_pos = value_pos;
149 base_reader_recurse (DBusTypeReader *sub,
150 DBusTypeReader *parent)
152 /* point subreader at the same place as parent */
162 struct_types_only_reader_recurse (DBusTypeReader *sub,
163 DBusTypeReader *parent)
165 base_reader_recurse (sub, parent);
167 _dbus_assert (_dbus_string_get_byte (sub->type_str,
168 sub->type_pos) == DBUS_STRUCT_BEGIN_CHAR);
174 struct_reader_recurse (DBusTypeReader *sub,
175 DBusTypeReader *parent)
177 struct_types_only_reader_recurse (sub, parent);
179 /* struct has 8 byte alignment */
180 sub->value_pos = _DBUS_ALIGN_VALUE (sub->value_pos, 8);
184 array_types_only_reader_recurse (DBusTypeReader *sub,
185 DBusTypeReader *parent)
187 base_reader_recurse (sub, parent);
189 /* point type_pos at the array element type */
192 /* Init with values likely to crash things if misused */
193 sub->u.array.start_pos = _DBUS_INT_MAX;
194 sub->array_len_offset = 7;
197 /** compute position of array length given array_len_offset, which is
198 the offset back from start_pos to end of the len */
199 #define ARRAY_READER_LEN_POS(reader) \
200 ((reader)->u.array.start_pos - ((int)(reader)->array_len_offset) - 4)
203 array_reader_get_array_len (const DBusTypeReader *reader)
205 dbus_uint32_t array_len;
208 len_pos = ARRAY_READER_LEN_POS (reader);
210 _dbus_assert (_DBUS_ALIGN_VALUE (len_pos, 4) == (unsigned) len_pos);
211 array_len = _dbus_unpack_uint32 (reader->byte_order,
212 _dbus_string_get_const_data_len (reader->value_str, len_pos, 4));
214 #if RECURSIVE_MARSHAL_READ_TRACE
215 _dbus_verbose (" reader %p len_pos %d array len %u len_offset %d\n",
216 reader, len_pos, array_len, reader->array_len_offset);
219 _dbus_assert (reader->u.array.start_pos - len_pos - 4 < 8);
225 array_reader_recurse (DBusTypeReader *sub,
226 DBusTypeReader *parent)
231 array_types_only_reader_recurse (sub, parent);
233 sub->value_pos = _DBUS_ALIGN_VALUE (sub->value_pos, 4);
235 len_pos = sub->value_pos;
237 sub->value_pos += 4; /* for the length */
239 alignment = element_type_get_alignment (sub->type_str,
242 sub->value_pos = _DBUS_ALIGN_VALUE (sub->value_pos, alignment);
244 sub->u.array.start_pos = sub->value_pos;
245 _dbus_assert ((sub->u.array.start_pos - (len_pos + 4)) < 8); /* only 3 bits in array_len_offset */
246 sub->array_len_offset = sub->u.array.start_pos - (len_pos + 4);
248 #if RECURSIVE_MARSHAL_READ_TRACE
249 _dbus_verbose (" type reader %p array start = %d len_offset = %d array len = %d array element type = %s\n",
251 sub->u.array.start_pos,
252 sub->array_len_offset,
253 array_reader_get_array_len (sub),
254 _dbus_type_to_string (_dbus_first_type_in_signature (sub->type_str,
260 variant_reader_recurse (DBusTypeReader *sub,
261 DBusTypeReader *parent)
264 int contained_alignment;
266 base_reader_recurse (sub, parent);
268 /* Variant is 1 byte sig length (without nul), signature with nul,
269 * padding to 8-boundary, then values
272 sig_len = _dbus_string_get_byte (sub->value_str, sub->value_pos);
274 sub->type_str = sub->value_str;
275 sub->type_pos = sub->value_pos + 1;
277 sub->value_pos = sub->type_pos + sig_len + 1;
279 contained_alignment = _dbus_type_get_alignment (_dbus_first_type_in_signature (sub->type_str,
282 sub->value_pos = _DBUS_ALIGN_VALUE (sub->value_pos, contained_alignment);
284 #if RECURSIVE_MARSHAL_READ_TRACE
285 _dbus_verbose (" type reader %p variant containing '%s'\n",
287 _dbus_string_get_const_data_len (sub->type_str,
293 array_reader_check_finished (const DBusTypeReader *reader)
297 /* return the array element type if elements remain, and
298 * TYPE_INVALID otherwise
301 end_pos = reader->u.array.start_pos + array_reader_get_array_len (reader);
303 _dbus_assert (reader->value_pos <= end_pos);
304 _dbus_assert (reader->value_pos >= reader->u.array.start_pos);
306 return reader->value_pos == end_pos;
309 /* this is written a little oddly to try and overoptimize */
311 skip_one_complete_type (const DBusString *type_str,
314 const unsigned char *p;
315 const unsigned char *start;
317 _dbus_assert (type_str != NULL);
318 _dbus_assert (type_pos != NULL);
320 start = _dbus_string_get_const_data (type_str);
321 p = start + *type_pos;
323 _dbus_assert (*p != DBUS_STRUCT_END_CHAR);
325 while (*p == DBUS_TYPE_ARRAY)
328 _dbus_assert (*p != DBUS_STRUCT_END_CHAR);
330 if (*p == DBUS_STRUCT_BEGIN_CHAR)
338 _dbus_assert (*p != DBUS_TYPE_INVALID);
342 _dbus_assert (*p != DBUS_TYPE_INVALID);
344 if (*p == DBUS_STRUCT_BEGIN_CHAR)
346 else if (*p == DBUS_STRUCT_END_CHAR)
362 *type_pos = (int) (p - start);
366 find_len_of_complete_type (const DBusString *type_str,
373 skip_one_complete_type (type_str, &end);
375 return end - type_pos;
379 base_reader_next (DBusTypeReader *reader,
382 switch (current_type)
384 case DBUS_TYPE_STRUCT:
385 case DBUS_TYPE_VARIANT:
386 /* Scan forward over the entire container contents */
390 if (reader->klass->types_only && current_type == DBUS_TYPE_VARIANT)
394 /* Recurse into the struct or variant */
395 _dbus_type_reader_recurse (reader, &sub);
397 /* Skip everything in this subreader */
398 while (_dbus_type_reader_next (&sub))
403 if (!reader->klass->types_only)
404 reader->value_pos = sub.value_pos;
406 /* Now we are at the end of this container; for variants, the
407 * subreader's type_pos is totally inapplicable (it's in the
408 * value string) but we know that we increment by one past the
411 if (current_type == DBUS_TYPE_VARIANT)
412 reader->type_pos += 1;
414 reader->type_pos = sub.type_pos;
418 case DBUS_TYPE_ARRAY:
420 if (!reader->klass->types_only)
421 _dbus_marshal_skip_array (reader->value_str,
422 _dbus_first_type_in_signature (reader->type_str,
423 reader->type_pos + 1),
427 skip_one_complete_type (reader->type_str, &reader->type_pos);
432 if (!reader->klass->types_only)
433 _dbus_marshal_skip_basic (reader->value_str,
434 current_type, reader->byte_order,
437 reader->type_pos += 1;
443 struct_reader_next (DBusTypeReader *reader,
448 base_reader_next (reader, current_type);
450 /* for STRUCT containers we return FALSE at the end of the struct,
451 * for INVALID we return FALSE at the end of the signature.
452 * In both cases we arrange for get_current_type() to return INVALID
453 * which is defined to happen iff we're at the end (no more next())
455 t = _dbus_string_get_byte (reader->type_str, reader->type_pos);
456 if (t == DBUS_STRUCT_END_CHAR)
458 reader->type_pos += 1;
459 reader->finished = TRUE;
464 array_types_only_reader_next (DBusTypeReader *reader,
467 /* We have one "element" to be iterated over
468 * in each array, which is its element type.
469 * So the finished flag indicates whether we've
470 * iterated over it yet or not.
472 reader->finished = TRUE;
476 array_reader_next (DBusTypeReader *reader,
479 /* Skip one array element */
482 end_pos = reader->u.array.start_pos + array_reader_get_array_len (reader);
484 #if RECURSIVE_MARSHAL_READ_TRACE
485 _dbus_verbose (" reader %p array next START start_pos = %d end_pos = %d value_pos = %d current_type = %s\n",
487 reader->u.array.start_pos,
488 end_pos, reader->value_pos,
489 _dbus_type_to_string (current_type));
492 _dbus_assert (reader->value_pos < end_pos);
493 _dbus_assert (reader->value_pos >= reader->u.array.start_pos);
495 switch (_dbus_first_type_in_signature (reader->type_str,
498 case DBUS_TYPE_STRUCT:
499 case DBUS_TYPE_VARIANT:
503 /* Recurse into the struct or variant */
504 _dbus_type_reader_recurse (reader, &sub);
506 /* Skip everything in this element */
507 while (_dbus_type_reader_next (&sub))
512 /* Now we are at the end of this element */
513 reader->value_pos = sub.value_pos;
517 case DBUS_TYPE_ARRAY:
519 _dbus_marshal_skip_array (reader->value_str,
520 _dbus_first_type_in_signature (reader->type_str,
521 reader->type_pos + 1),
529 _dbus_marshal_skip_basic (reader->value_str,
530 current_type, reader->byte_order,
536 #if RECURSIVE_MARSHAL_READ_TRACE
537 _dbus_verbose (" reader %p array next END start_pos = %d end_pos = %d value_pos = %d current_type = %s\n",
539 reader->u.array.start_pos,
540 end_pos, reader->value_pos,
541 _dbus_type_to_string (current_type));
544 _dbus_assert (reader->value_pos <= end_pos);
546 if (reader->value_pos == end_pos)
548 skip_one_complete_type (reader->type_str,
554 array_init_from_mark (DBusTypeReader *reader,
555 const DBusTypeMark *mark)
557 /* Fill in the array-specific fields from the mark. The general
558 * fields are already filled in.
560 reader->u.array.start_pos = mark->array_start_pos;
561 reader->array_len_offset = mark->array_len_offset;
564 static const DBusTypeReaderClass body_reader_class = {
567 NULL, /* body is always toplevel, so doesn't get recursed into */
573 static const DBusTypeReaderClass body_types_only_reader_class = {
576 NULL, /* body is always toplevel, so doesn't get recursed into */
582 static const DBusTypeReaderClass struct_reader_class = {
585 struct_reader_recurse,
591 static const DBusTypeReaderClass struct_types_only_reader_class = {
594 struct_types_only_reader_recurse,
600 static const DBusTypeReaderClass array_reader_class = {
603 array_reader_recurse,
604 array_reader_check_finished,
609 static const DBusTypeReaderClass array_types_only_reader_class = {
612 array_types_only_reader_recurse,
614 array_types_only_reader_next,
618 static const DBusTypeReaderClass variant_reader_class = {
621 variant_reader_recurse,
627 static const DBusTypeReaderClass const *
628 all_reader_classes[] = {
630 &body_types_only_reader_class,
631 &struct_reader_class,
632 &struct_types_only_reader_class,
634 &array_types_only_reader_class,
635 &variant_reader_class
639 * Initializes a type reader.
641 * @param reader the reader
642 * @param byte_order the byte order of the block to read
643 * @param type_str the signature of the block to read
644 * @param type_pos location of signature
645 * @param value_str the string containing values block
646 * @param value_pos start of values block
649 _dbus_type_reader_init (DBusTypeReader *reader,
651 const DBusString *type_str,
653 const DBusString *value_str,
656 reader->klass = &body_reader_class;
658 reader_init (reader, byte_order, type_str, type_pos,
659 value_str, value_pos);
661 #if RECURSIVE_MARSHAL_READ_TRACE
662 _dbus_verbose (" type reader %p init type_pos = %d value_pos = %d remaining sig '%s'\n",
663 reader, reader->type_pos, reader->value_pos,
664 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0));
669 * Initializes a type reader that's been compressed into a
670 * DBusTypeMark. The args have to be the same as those passed in to
671 * create the original #DBusTypeReader.
673 * @param reader the reader
674 * @param byte_order the byte order of the value block
675 * @param type_str string containing the type signature
676 * @param value_str string containing the values block
677 * @param mark the mark to decompress from
680 _dbus_type_reader_init_from_mark (DBusTypeReader *reader,
682 const DBusString *type_str,
683 const DBusString *value_str,
684 const DBusTypeMark *mark)
686 reader->klass = all_reader_classes[mark->container_type];
688 reader_init (reader, byte_order,
689 mark->type_pos_in_value_str ? value_str : type_str,
691 value_str, mark->value_pos);
693 if (reader->klass->init_from_mark)
694 (* reader->klass->init_from_mark) (reader, mark);
696 #if RECURSIVE_MARSHAL_READ_TRACE
697 _dbus_verbose (" type reader %p init from mark type_pos = %d value_pos = %d remaining sig '%s'\n",
698 reader, reader->type_pos, reader->value_pos,
699 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0));
704 * Like _dbus_type_reader_init() but the iteration is over the
705 * signature, not over values.
707 * @param reader the reader
708 * @param type_str the signature string
709 * @param type_pos location in the signature string
712 _dbus_type_reader_init_types_only (DBusTypeReader *reader,
713 const DBusString *type_str,
716 reader->klass = &body_types_only_reader_class;
718 reader_init (reader, DBUS_COMPILER_BYTE_ORDER /* irrelevant */,
719 type_str, type_pos, NULL, _DBUS_INT_MAX /* crashes if we screw up */);
721 #if RECURSIVE_MARSHAL_READ_TRACE
722 _dbus_verbose (" type reader %p init types only type_pos = %d remaining sig '%s'\n",
723 reader, reader->type_pos,
724 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0));
729 * Like _dbus_type_reader_init_from_mark() but only iterates over
730 * the signature, not the values.
732 * @param reader the reader
733 * @param type_str the signature string
734 * @param mark the mark to decompress from
737 _dbus_type_reader_init_types_only_from_mark (DBusTypeReader *reader,
738 const DBusString *type_str,
739 const DBusTypeMark *mark)
741 reader->klass = all_reader_classes[mark->container_type];
742 _dbus_assert (reader->klass->types_only);
743 _dbus_assert (!mark->type_pos_in_value_str);
745 reader_init (reader, DBUS_COMPILER_BYTE_ORDER, /* irrelevant */
746 type_str, mark->type_pos,
747 NULL, _DBUS_INT_MAX /* crashes if we screw up */);
749 if (reader->klass->init_from_mark)
750 (* reader->klass->init_from_mark) (reader, mark);
752 #if RECURSIVE_MARSHAL_READ_TRACE
753 _dbus_verbose (" type reader %p init types only from mark type_pos = %d remaining sig '%s'\n",
754 reader, reader->type_pos,
755 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0));
760 * Compresses a type reader into a #DBusTypeMark, useful for example
761 * if you want to cache a bunch of positions in a block of values.
763 * @param reader the reader
764 * @param mark the mark to init
767 _dbus_type_reader_save_mark (const DBusTypeReader *reader,
770 mark->type_pos_in_value_str = (reader->type_str == reader->value_str);
771 mark->container_type = reader->klass->id;
772 _dbus_assert (all_reader_classes[reader->klass->id] == reader->klass);
774 mark->type_pos = reader->type_pos;
775 mark->value_pos = reader->value_pos;
777 /* these are just junk if the reader isn't really an array of course */
778 mark->array_len_offset = reader->array_len_offset;
779 mark->array_start_pos = reader->u.array.start_pos;
783 * Gets the type of the value the reader is currently pointing to;
784 * or for a types-only reader gets the type it's currently pointing to.
785 * If the reader is at the end of a block or end of a container such
786 * as an array, returns #DBUS_TYPE_INVALID.
788 * @param reader the reader
791 _dbus_type_reader_get_current_type (const DBusTypeReader *reader)
795 if (reader->finished ||
796 (reader->klass->check_finished &&
797 (* reader->klass->check_finished) (reader)))
798 t = DBUS_TYPE_INVALID;
800 t = _dbus_first_type_in_signature (reader->type_str,
803 _dbus_assert (t != DBUS_STRUCT_END_CHAR);
804 _dbus_assert (t != DBUS_STRUCT_BEGIN_CHAR);
807 _dbus_verbose (" type reader %p current type_pos = %d type = %s\n",
808 reader, reader->type_pos,
809 _dbus_type_to_string (t));
816 * Gets the type of an element of the array the reader is currently
817 * pointing to. It's an error to call this if
818 * _dbus_type_reader_get_current_type() doesn't return #DBUS_TYPE_ARRAY
821 * @param reader the reader
824 _dbus_type_reader_get_element_type (const DBusTypeReader *reader)
828 _dbus_assert (_dbus_type_reader_get_current_type (reader) == DBUS_TYPE_ARRAY);
830 element_type = _dbus_first_type_in_signature (reader->type_str,
831 reader->type_pos + 1);
837 * Gets the current position in the value block
838 * @param reader the reader
841 _dbus_type_reader_get_value_pos (const DBusTypeReader *reader)
843 return reader->value_pos;
847 * Get the address of the marshaled value in the data being read. The
848 * address may not be aligned; you have to align it to the type of the
849 * value you want to read. Most of the demarshal routines do this for
852 * @param reader the reader
853 * @param value_location the address of the marshaled value
856 _dbus_type_reader_read_raw (const DBusTypeReader *reader,
857 const unsigned char **value_location)
859 _dbus_assert (!reader->klass->types_only);
861 *value_location = _dbus_string_get_const_data_len (reader->value_str,
867 * Reads a basic-typed value, as with _dbus_marshal_read_basic().
869 * @param reader the reader
870 * @param value the address of the value
873 _dbus_type_reader_read_basic (const DBusTypeReader *reader,
878 _dbus_assert (!reader->klass->types_only);
880 t = _dbus_type_reader_get_current_type (reader);
882 _dbus_marshal_read_basic (reader->value_str,
889 #if RECURSIVE_MARSHAL_READ_TRACE
890 _dbus_verbose (" type reader %p read basic type_pos = %d value_pos = %d remaining sig '%s'\n",
891 reader, reader->type_pos, reader->value_pos,
892 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0));
897 * Reads a block of fixed-length basic values, from the current point
898 * in an array to the end of the array. Does not work for arrays of
899 * string or container types.
901 * This function returns the array in-place; it does not make a copy,
902 * and it does not swap the bytes.
904 * If you ask for #DBUS_TYPE_DOUBLE you will get a "const double*" back
905 * and the "value" argument should be a "const double**" and so on.
907 * @param reader the reader to read from
908 * @param value place to return the array values
909 * @param n_elements place to return number of array elements
912 _dbus_type_reader_read_fixed_multi (const DBusTypeReader *reader,
922 _dbus_assert (!reader->klass->types_only);
923 _dbus_assert (reader->klass == &array_reader_class);
925 element_type = _dbus_first_type_in_signature (reader->type_str,
928 _dbus_assert (element_type != DBUS_TYPE_INVALID); /* why we don't use get_current_type() */
929 _dbus_assert (_dbus_type_is_fixed (element_type));
931 alignment = _dbus_type_get_alignment (element_type);
933 _dbus_assert (reader->value_pos >= reader->u.array.start_pos);
935 total_len = array_reader_get_array_len (reader);
936 end_pos = reader->u.array.start_pos + total_len;
937 remaining_len = end_pos - reader->value_pos;
939 #if RECURSIVE_MARSHAL_READ_TRACE
940 _dbus_verbose ("end_pos %d total_len %d remaining_len %d value_pos %d\n",
941 end_pos, total_len, remaining_len, reader->value_pos);
944 _dbus_assert (remaining_len <= total_len);
946 if (remaining_len == 0)
947 *(const DBusBasicValue**) value = NULL;
949 *(const DBusBasicValue**) value =
950 (void*) _dbus_string_get_const_data_len (reader->value_str,
954 *n_elements = remaining_len / alignment;
955 _dbus_assert ((remaining_len % alignment) == 0);
957 #if RECURSIVE_MARSHAL_READ_TRACE
958 _dbus_verbose (" type reader %p read fixed array type_pos = %d value_pos = %d remaining sig '%s'\n",
959 reader, reader->type_pos, reader->value_pos,
960 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0));
965 * Initialize a new reader pointing to the first type and
966 * corresponding value that's a child of the current container. It's
967 * an error to call this if the current type is a non-container.
969 * Note that DBusTypeReader traverses values, not types. So if you
970 * have an empty array of array of int, you can't recurse into it. You
971 * can only recurse into each element.
973 * @param reader the reader
974 * @param sub a reader to init pointing to the first child
977 _dbus_type_reader_recurse (DBusTypeReader *reader,
982 t = _dbus_first_type_in_signature (reader->type_str, reader->type_pos);
986 case DBUS_TYPE_STRUCT:
987 if (reader->klass->types_only)
988 sub->klass = &struct_types_only_reader_class;
990 sub->klass = &struct_reader_class;
992 case DBUS_TYPE_ARRAY:
993 if (reader->klass->types_only)
994 sub->klass = &array_types_only_reader_class;
996 sub->klass = &array_reader_class;
998 case DBUS_TYPE_VARIANT:
999 if (reader->klass->types_only)
1000 _dbus_assert_not_reached ("can't recurse into variant typecode");
1002 sub->klass = &variant_reader_class;
1005 _dbus_verbose ("recursing into type %s\n", _dbus_type_to_string (t));
1006 #ifndef DBUS_DISABLE_CHECKS
1007 if (t == DBUS_TYPE_INVALID)
1008 _dbus_warn ("You can't recurse into an empty array or off the end of a message body\n");
1009 #endif /* DBUS_DISABLE_CHECKS */
1011 _dbus_assert_not_reached ("don't yet handle recursing into this type");
1014 _dbus_assert (sub->klass == all_reader_classes[sub->klass->id]);
1016 (* sub->klass->recurse) (sub, reader);
1018 #if RECURSIVE_MARSHAL_READ_TRACE
1019 _dbus_verbose (" type reader %p RECURSED type_pos = %d value_pos = %d remaining sig '%s'\n",
1020 sub, sub->type_pos, sub->value_pos,
1021 _dbus_string_get_const_data_len (sub->type_str, sub->type_pos, 0));
1026 * Skip to the next value on this "level". e.g. the next field in a
1027 * struct, the next value in an array. Returns FALSE at the end of the
1028 * current container.
1030 * @param reader the reader
1031 * @returns FALSE if nothing more to read at or below this level
1034 _dbus_type_reader_next (DBusTypeReader *reader)
1038 t = _dbus_type_reader_get_current_type (reader);
1040 #if RECURSIVE_MARSHAL_READ_TRACE
1041 _dbus_verbose (" type reader %p START next() { type_pos = %d value_pos = %d remaining sig '%s' current_type = %s\n",
1042 reader, reader->type_pos, reader->value_pos,
1043 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0),
1044 _dbus_type_to_string (t));
1047 if (t == DBUS_TYPE_INVALID)
1050 (* reader->klass->next) (reader, t);
1052 #if RECURSIVE_MARSHAL_READ_TRACE
1053 _dbus_verbose (" type reader %p END next() type_pos = %d value_pos = %d remaining sig '%s' current_type = %s\n",
1054 reader, reader->type_pos, reader->value_pos,
1055 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0),
1056 _dbus_type_to_string (_dbus_type_reader_get_current_type (reader)));
1059 return _dbus_type_reader_get_current_type (reader) != DBUS_TYPE_INVALID;
1063 * Check whether there's another value on this "level". e.g. the next
1064 * field in a struct, the next value in an array. Returns FALSE at the
1065 * end of the current container.
1067 * You probably don't want to use this; it makes for an awkward for/while
1068 * loop. A nicer one is "while ((current_type = get_current_type()) != INVALID)"
1070 * @param reader the reader
1071 * @returns FALSE if nothing more to read at or below this level
1074 _dbus_type_reader_has_next (const DBusTypeReader *reader)
1076 /* Not efficient but works for now. */
1077 DBusTypeReader copy;
1080 return _dbus_type_reader_next (©);
1084 * Gets the string and range of said string containing the signature
1085 * of the current value. Essentially a more complete version of
1086 * _dbus_type_reader_get_current_type() (returns the full type
1087 * rather than only the outside of the onion).
1089 * Note though that the first byte in a struct signature is
1090 * #DBUS_STRUCT_BEGIN_CHAR while the current type will be
1091 * #DBUS_TYPE_STRUCT so it isn't true that the first byte of the
1092 * signature is always the same as the current type. Another
1093 * difference is that this function will still return a signature when
1094 * inside an empty array; say you recurse into empty array of int32,
1095 * the signature is "i" but the current type will always be
1096 * #DBUS_TYPE_INVALID since there are no elements to be currently
1099 * @param reader the reader
1100 * @param str_p place to return the string with the type in it
1101 * @param start_p place to return start of the type
1102 * @param len_p place to return the length of the type
1105 _dbus_type_reader_get_signature (const DBusTypeReader *reader,
1106 const DBusString **str_p,
1110 *str_p = reader->type_str;
1111 *start_p = reader->type_pos;
1112 *len_p = find_len_of_complete_type (reader->type_str, reader->type_pos);
1117 DBusString replacement;
1122 replacement_block_init (ReplacementBlock *block,
1123 DBusTypeReader *reader)
1125 if (!_dbus_string_init (&block->replacement))
1128 /* % 8 is the padding to have the same align properties in
1129 * our replacement string as we do at the position being replaced
1131 block->padding = reader->value_pos % 8;
1133 if (!_dbus_string_lengthen (&block->replacement, block->padding))
1139 _dbus_string_free (&block->replacement);
1144 replacement_block_replace (ReplacementBlock *block,
1145 DBusTypeReader *reader,
1146 const DBusTypeReader *realign_root)
1148 DBusTypeWriter writer;
1149 DBusTypeReader realign_reader;
1153 _dbus_assert (realign_root != NULL);
1155 orig_len = _dbus_string_get_length (&block->replacement);
1157 realign_reader = *realign_root;
1159 #if RECURSIVE_MARSHAL_WRITE_TRACE
1160 _dbus_verbose ("INITIALIZING replacement block writer %p at value_pos %d\n",
1161 &writer, _dbus_string_get_length (&block->replacement));
1163 _dbus_type_writer_init_values_only (&writer,
1164 realign_reader.byte_order,
1165 realign_reader.type_str,
1166 realign_reader.type_pos,
1167 &block->replacement,
1168 _dbus_string_get_length (&block->replacement));
1170 _dbus_assert (realign_reader.value_pos <= reader->value_pos);
1172 #if RECURSIVE_MARSHAL_WRITE_TRACE
1173 _dbus_verbose ("COPYING from reader at value_pos %d to writer %p starting after value_pos %d\n",
1174 realign_reader.value_pos, &writer, reader->value_pos);
1177 if (!_dbus_type_writer_write_reader_partial (&writer,
1181 _dbus_string_get_length (&block->replacement) - block->padding,
1185 #if RECURSIVE_MARSHAL_WRITE_TRACE
1186 _dbus_verbose ("REPLACEMENT at padding %d len %d\n", block->padding,
1187 _dbus_string_get_length (&block->replacement) - block->padding);
1188 _dbus_verbose_bytes_of_string (&block->replacement, block->padding,
1189 _dbus_string_get_length (&block->replacement) - block->padding);
1190 _dbus_verbose ("TO BE REPLACED at value_pos = %d (align pad %d) len %d realign_reader.value_pos %d\n",
1191 reader->value_pos, reader->value_pos % 8,
1192 realign_reader.value_pos - reader->value_pos,
1193 realign_reader.value_pos);
1194 _dbus_verbose_bytes_of_string (reader->value_str,
1196 realign_reader.value_pos - reader->value_pos);
1199 /* Move the replacement into position
1200 * (realign_reader should now be at the end of the block to be replaced)
1202 if (!_dbus_string_replace_len (&block->replacement, block->padding,
1203 _dbus_string_get_length (&block->replacement) - block->padding,
1204 (DBusString*) reader->value_str,
1206 realign_reader.value_pos - reader->value_pos))
1209 /* Process our fixups now that we can't have an OOM error */
1210 apply_and_free_fixups (&fixups, reader);
1215 _dbus_string_set_length (&block->replacement, orig_len);
1216 free_fixups (&fixups);
1221 replacement_block_free (ReplacementBlock *block)
1223 _dbus_string_free (&block->replacement);
1226 /* In the variable-length case, we have to fix alignment after we insert.
1227 * The strategy is as follows:
1229 * - pad a new string to have the same alignment as the
1230 * start of the current basic value
1231 * - write the new basic value
1232 * - copy from the original reader to the new string,
1233 * which will fix the alignment of types following
1235 * - this copy has to start at realign_root,
1236 * but not really write anything until it
1237 * passes the value being set
1238 * - as an optimization, we can stop copying
1239 * when the source and dest values are both
1240 * on an 8-boundary, since we know all following
1241 * padding and alignment will be identical
1242 * - copy the new string back to the original
1243 * string, replacing the relevant part of the
1245 * - now any arrays in the original string that
1246 * contained the replaced string may have the
1247 * wrong length; so we have to fix that
1250 reader_set_basic_variable_length (DBusTypeReader *reader,
1253 const DBusTypeReader *realign_root)
1256 ReplacementBlock block;
1257 DBusTypeWriter writer;
1259 _dbus_assert (realign_root != NULL);
1263 if (!replacement_block_init (&block, reader))
1266 /* Write the new basic value */
1267 #if RECURSIVE_MARSHAL_WRITE_TRACE
1268 _dbus_verbose ("INITIALIZING writer %p to write basic value at value_pos %d of replacement string\n",
1269 &writer, _dbus_string_get_length (&block.replacement));
1271 _dbus_type_writer_init_values_only (&writer,
1276 _dbus_string_get_length (&block.replacement));
1277 #if RECURSIVE_MARSHAL_WRITE_TRACE
1278 _dbus_verbose ("WRITING basic value to writer %p (replacement string)\n", &writer);
1280 if (!_dbus_type_writer_write_basic (&writer, current_type, value))
1283 if (!replacement_block_replace (&block,
1291 replacement_block_free (&block);
1296 reader_set_basic_fixed_length (DBusTypeReader *reader,
1300 _dbus_marshal_set_basic ((DBusString*) reader->value_str,
1309 * Sets a new value for the basic type value pointed to by the reader,
1310 * leaving the reader valid to continue reading. Any other readers
1311 * will be invalidated if you set a variable-length type such as a
1314 * The provided realign_root is the reader to start from when
1315 * realigning the data that follows the newly-set value. The reader
1316 * parameter must point to a value below the realign_root parameter.
1317 * If the type being set is fixed-length, then realign_root may be
1318 * #NULL. Only values reachable from realign_root will be realigned,
1319 * so if your string contains other values you will need to deal with
1320 * those somehow yourself. It is OK if realign_root is the same
1321 * reader as the reader parameter, though if you aren't setting the
1322 * root it may not be such a good idea.
1324 * @todo DBusTypeReader currently takes "const" versions of the type
1325 * and value strings, and this function modifies those strings by
1326 * casting away the const, which is of course bad if we want to get
1327 * picky. (To be truly clean you'd have an object which contained the
1328 * type and value strings and set_basic would be a method on that
1329 * object... this would also make DBusTypeReader the same thing as
1330 * DBusTypeMark. But since DBusMessage is effectively that object for
1331 * D-BUS it doesn't seem worth creating some random object.)
1333 * @todo optimize this by only rewriting until the old and new values
1334 * are at the same alignment. Frequently this should result in only
1335 * replacing the value that's immediately at hand.
1337 * @param reader reader indicating where to set a new value
1338 * @param value address of the value to set
1339 * @param realign_root realign from here
1340 * @returns #FALSE if not enough memory
1343 _dbus_type_reader_set_basic (DBusTypeReader *reader,
1345 const DBusTypeReader *realign_root)
1349 _dbus_assert (!reader->klass->types_only);
1350 _dbus_assert (reader->value_str == realign_root->value_str);
1351 _dbus_assert (reader->value_pos >= realign_root->value_pos);
1353 current_type = _dbus_type_reader_get_current_type (reader);
1355 #if RECURSIVE_MARSHAL_WRITE_TRACE
1356 _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",
1357 reader, reader->type_pos, reader->value_pos,
1358 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0),
1360 realign_root ? realign_root->value_pos : -1,
1361 _dbus_type_to_string (current_type));
1362 _dbus_verbose_bytes_of_string (realign_root->value_str, realign_root->value_pos,
1363 _dbus_string_get_length (realign_root->value_str) -
1364 realign_root->value_pos);
1367 _dbus_assert (_dbus_type_is_basic (current_type));
1369 if (_dbus_type_is_fixed (current_type))
1371 reader_set_basic_fixed_length (reader, current_type, value);
1376 _dbus_assert (realign_root != NULL);
1377 return reader_set_basic_variable_length (reader, current_type,
1378 value, realign_root);
1383 * Recursively deletes any value pointed to by the reader, leaving the
1384 * reader valid to continue reading. Any other readers will be
1387 * The provided realign_root is the reader to start from when
1388 * realigning the data that follows the newly-set value.
1389 * See _dbus_type_reader_set_basic() for more details on the
1390 * realign_root paramter.
1392 * @todo for now this does not delete the typecodes associated with
1393 * the value, so this function should only be used for array elements.
1395 * @param reader reader indicating where to delete a value
1396 * @param realign_root realign from here
1397 * @returns #FALSE if not enough memory
1400 _dbus_type_reader_delete (DBusTypeReader *reader,
1401 const DBusTypeReader *realign_root)
1404 ReplacementBlock block;
1406 _dbus_assert (realign_root != NULL);
1407 _dbus_assert (reader->klass == &array_reader_class);
1411 if (!replacement_block_init (&block, reader))
1414 if (!replacement_block_replace (&block,
1422 replacement_block_free (&block);
1427 * Compares two readers, which must be iterating over the same value data.
1428 * Returns #TRUE if the first parameter is further along than the second parameter.
1430 * @param lhs left-hand-side (first) parameter
1431 * @param rhs left-hand-side (first) parameter
1432 * @returns whether lhs is greater than rhs
1435 _dbus_type_reader_greater_than (const DBusTypeReader *lhs,
1436 const DBusTypeReader *rhs)
1438 _dbus_assert (lhs->value_str == rhs->value_str);
1440 return lhs->value_pos > rhs->value_pos;
1453 * Initialize a write iterator, which is used to write out values in
1454 * serialized D-BUS format.
1456 * The type_pos passed in is expected to be inside an already-valid,
1457 * though potentially empty, type signature. This means that the byte
1458 * after type_pos must be either #DBUS_TYPE_INVALID (aka nul) or some
1459 * other valid type. #DBusTypeWriter won't enforce that the signature
1460 * is already valid (you can append the nul byte at the end if you
1461 * like), but just be aware that you need the nul byte eventually and
1462 * #DBusTypeWriter isn't going to write it for you.
1464 * @param writer the writer to init
1465 * @param byte_order the byte order to marshal into
1466 * @param type_str the string to write typecodes into
1467 * @param type_pos where to insert typecodes
1468 * @param value_str the string to write values into
1469 * @param value_pos where to insert values
1473 _dbus_type_writer_init (DBusTypeWriter *writer,
1475 DBusString *type_str,
1477 DBusString *value_str,
1480 writer->byte_order = byte_order;
1481 writer->type_str = type_str;
1482 writer->type_pos = type_pos;
1483 writer->value_str = value_str;
1484 writer->value_pos = value_pos;
1485 writer->container_type = DBUS_TYPE_INVALID;
1486 writer->type_pos_is_expectation = FALSE;
1487 writer->enabled = TRUE;
1489 #if RECURSIVE_MARSHAL_WRITE_TRACE
1490 _dbus_verbose ("writer %p init remaining sig '%s'\n", writer,
1492 _dbus_string_get_const_data_len (writer->type_str, writer->type_pos, 0) :
1498 * Initialize a write iterator, with the signature to be provided
1501 * @param writer the writer to init
1502 * @param byte_order the byte order to marshal into
1503 * @param value_str the string to write values into
1504 * @param value_pos where to insert values
1508 _dbus_type_writer_init_types_delayed (DBusTypeWriter *writer,
1510 DBusString *value_str,
1513 _dbus_type_writer_init (writer, byte_order,
1514 NULL, 0, value_str, value_pos);
1518 * Adds type string to the writer, if it had none.
1520 * @param writer the writer to init
1521 * @param type_str type string to add
1522 * @param type_pos type position
1526 _dbus_type_writer_add_types (DBusTypeWriter *writer,
1527 DBusString *type_str,
1530 if (writer->type_str == NULL) /* keeps us from using this as setter */
1532 writer->type_str = type_str;
1533 writer->type_pos = type_pos;
1538 * Removes type string from the writer.
1540 * @param writer the writer to remove from
1543 _dbus_type_writer_remove_types (DBusTypeWriter *writer)
1545 writer->type_str = NULL;
1546 writer->type_pos = -1;
1550 * Like _dbus_type_writer_init(), except the type string
1551 * passed in should correspond to an existing signature that
1552 * matches what you're going to write out. The writer will
1553 * check what you write vs. this existing signature.
1555 * @param writer the writer to init
1556 * @param byte_order the byte order to marshal into
1557 * @param type_str the string with signature
1558 * @param type_pos start of signature
1559 * @param value_str the string to write values into
1560 * @param value_pos where to insert values
1564 _dbus_type_writer_init_values_only (DBusTypeWriter *writer,
1566 const DBusString *type_str,
1568 DBusString *value_str,
1571 _dbus_type_writer_init (writer, byte_order,
1572 (DBusString*)type_str, type_pos,
1573 value_str, value_pos);
1575 writer->type_pos_is_expectation = TRUE;
1579 _dbus_type_writer_write_basic_no_typecode (DBusTypeWriter *writer,
1583 if (writer->enabled)
1584 return _dbus_marshal_write_basic (writer->value_str,
1589 &writer->value_pos);
1594 /* If our parent is an array, things are a little bit complicated.
1596 * The parent must have a complete element type, such as
1597 * "i" or "aai" or "(ii)" or "a(ii)". There can't be
1598 * unclosed parens, or an "a" with no following type.
1600 * To recurse, the only allowed operation is to recurse into the
1601 * first type in the element type. So for "i" you can't recurse, for
1602 * "ai" you can recurse into the array, for "(ii)" you can recurse
1605 * If you recurse into the array for "ai", then you must specify
1606 * "i" for the element type of the array you recurse into.
1608 * While inside an array at any level, we need to avoid writing to
1609 * type_str, since the type only appears once for the whole array,
1610 * it does not appear for each array element.
1612 * While inside an array type_pos points to the expected next
1613 * typecode, rather than the next place we could write a typecode.
1616 writer_recurse_init_and_check (DBusTypeWriter *writer,
1618 DBusTypeWriter *sub)
1620 _dbus_type_writer_init (sub,
1627 sub->container_type = container_type;
1629 if (writer->type_pos_is_expectation ||
1630 (sub->container_type == DBUS_TYPE_ARRAY || sub->container_type == DBUS_TYPE_VARIANT))
1631 sub->type_pos_is_expectation = TRUE;
1633 sub->type_pos_is_expectation = FALSE;
1635 sub->enabled = writer->enabled;
1637 #ifndef DBUS_DISABLE_CHECKS
1638 if (writer->type_pos_is_expectation && writer->type_str)
1642 expected = _dbus_first_type_in_signature (writer->type_str, writer->type_pos);
1644 if (expected != sub->container_type)
1646 _dbus_warn ("Writing an element of type %s, but the expected type here is %s\n",
1647 _dbus_type_to_string (sub->container_type),
1648 _dbus_type_to_string (expected));
1649 _dbus_assert_not_reached ("bad array element or variant content written");
1652 #endif /* DBUS_DISABLE_CHECKS */
1654 #if RECURSIVE_MARSHAL_WRITE_TRACE
1655 _dbus_verbose (" type writer %p recurse parent %s type_pos = %d value_pos = %d is_expectation = %d remaining sig '%s' enabled = %d\n",
1657 _dbus_type_to_string (writer->container_type),
1658 writer->type_pos, writer->value_pos, writer->type_pos_is_expectation,
1660 _dbus_string_get_const_data_len (writer->type_str, writer->type_pos, 0) :
1663 _dbus_verbose (" type writer %p recurse sub %s type_pos = %d value_pos = %d is_expectation = %d enabled = %d\n",
1665 _dbus_type_to_string (sub->container_type),
1666 sub->type_pos, sub->value_pos,
1667 sub->type_pos_is_expectation,
1673 write_or_verify_typecode (DBusTypeWriter *writer,
1676 /* A subwriter inside an array or variant will have type_pos
1677 * pointing to the expected typecode; a writer not inside an array
1678 * or variant has type_pos pointing to the next place to insert a
1681 #if RECURSIVE_MARSHAL_WRITE_TRACE
1682 _dbus_verbose (" type writer %p write_or_verify start type_pos = %d remaining sig '%s' enabled = %d\n",
1683 writer, writer->type_pos,
1685 _dbus_string_get_const_data_len (writer->type_str, writer->type_pos, 0) :
1690 if (writer->type_str == NULL)
1693 if (writer->type_pos_is_expectation)
1695 #ifndef DBUS_DISABLE_CHECKS
1699 expected = _dbus_string_get_byte (writer->type_str, writer->type_pos);
1701 if (expected != typecode)
1703 _dbus_warn ("Array or variant type requires that type %s be written, but %s was written\n",
1704 _dbus_type_to_string (expected), _dbus_type_to_string (typecode));
1705 _dbus_assert_not_reached ("bad type inserted somewhere inside an array or variant");
1708 #endif /* DBUS_DISABLE_CHECKS */
1710 /* if immediately inside an array we'd always be appending an element,
1711 * so the expected type doesn't change; if inside a struct or something
1712 * below an array, we need to move through said struct or something.
1714 if (writer->container_type != DBUS_TYPE_ARRAY)
1715 writer->type_pos += 1;
1719 if (!_dbus_string_insert_byte (writer->type_str,
1724 writer->type_pos += 1;
1727 #if RECURSIVE_MARSHAL_WRITE_TRACE
1728 _dbus_verbose (" type writer %p write_or_verify end type_pos = %d remaining sig '%s'\n",
1729 writer, writer->type_pos,
1730 _dbus_string_get_const_data_len (writer->type_str, writer->type_pos, 0));
1737 writer_recurse_struct (DBusTypeWriter *writer,
1738 const DBusString *contained_type,
1739 int contained_type_start,
1740 int contained_type_len,
1741 DBusTypeWriter *sub)
1743 /* FIXME right now contained_type is ignored; we could probably
1744 * almost trivially fix the code so if it's present we
1745 * write it out and then set type_pos_is_expectation
1748 /* Ensure that we'll be able to add alignment padding and the typecode */
1749 if (writer->enabled)
1751 if (!_dbus_string_alloc_space (sub->value_str, 8))
1755 if (!write_or_verify_typecode (sub, DBUS_STRUCT_BEGIN_CHAR))
1756 _dbus_assert_not_reached ("failed to insert struct typecode after prealloc");
1758 if (writer->enabled)
1760 if (!_dbus_string_insert_bytes (sub->value_str,
1762 _DBUS_ALIGN_VALUE (sub->value_pos, 8) - sub->value_pos,
1764 _dbus_assert_not_reached ("should not have failed to insert alignment padding for struct");
1765 sub->value_pos = _DBUS_ALIGN_VALUE (sub->value_pos, 8);
1773 writer_recurse_array (DBusTypeWriter *writer,
1774 const DBusString *contained_type,
1775 int contained_type_start,
1776 int contained_type_len,
1777 DBusTypeWriter *sub,
1778 dbus_bool_t is_array_append)
1780 dbus_uint32_t value = 0;
1784 #ifndef DBUS_DISABLE_CHECKS
1785 if (writer->container_type == DBUS_TYPE_ARRAY &&
1788 if (!_dbus_string_equal_substring (contained_type,
1789 contained_type_start,
1792 writer->u.array.element_type_pos + 1))
1794 _dbus_warn ("Writing an array of '%s' but this is incompatible with the expected type of elements in the parent array\n",
1795 _dbus_string_get_const_data_len (contained_type,
1796 contained_type_start,
1797 contained_type_len));
1798 _dbus_assert_not_reached ("incompatible type for child array");
1801 #endif /* DBUS_DISABLE_CHECKS */
1803 if (writer->enabled && !is_array_append)
1805 /* 3 pad + 4 bytes for the array length, and 4 bytes possible padding
1806 * before array values
1808 if (!_dbus_string_alloc_space (sub->value_str, 3 + 4 + 4))
1812 if (writer->type_str != NULL)
1814 sub->type_pos += 1; /* move to point to the element type, since type_pos
1815 * should be the expected type for further writes
1817 sub->u.array.element_type_pos = sub->type_pos;
1820 if (!writer->type_pos_is_expectation)
1822 /* sub is a toplevel/outermost array so we need to write the type data */
1824 /* alloc space for array typecode, element signature */
1825 if (!_dbus_string_alloc_space (writer->type_str, 1 + contained_type_len))
1828 if (!_dbus_string_insert_byte (writer->type_str,
1831 _dbus_assert_not_reached ("failed to insert array typecode after prealloc");
1833 if (!_dbus_string_copy_len (contained_type,
1834 contained_type_start, contained_type_len,
1836 sub->u.array.element_type_pos))
1837 _dbus_assert_not_reached ("should not have failed to insert array element typecodes");
1840 if (writer->type_str != NULL)
1842 /* If the parent is an array, we hold type_pos pointing at the array element type;
1843 * otherwise advance it to reflect the array value we just recursed into
1845 if (writer->container_type != DBUS_TYPE_ARRAY)
1846 writer->type_pos += 1 + contained_type_len;
1848 _dbus_assert (writer->type_pos_is_expectation); /* because it's an array */
1851 if (writer->enabled)
1853 /* Write (or jump over, if is_array_append) the length */
1854 sub->u.array.len_pos = _DBUS_ALIGN_VALUE (sub->value_pos, 4);
1856 if (is_array_append)
1858 sub->value_pos += 4;
1862 if (!_dbus_type_writer_write_basic_no_typecode (sub, DBUS_TYPE_UINT32,
1864 _dbus_assert_not_reached ("should not have failed to insert array len");
1867 _dbus_assert (sub->u.array.len_pos == sub->value_pos - 4);
1869 /* Write alignment padding for array elements
1870 * Note that we write the padding *even for empty arrays*
1871 * to avoid wonky special cases
1873 alignment = element_type_get_alignment (contained_type, contained_type_start);
1875 aligned = _DBUS_ALIGN_VALUE (sub->value_pos, alignment);
1876 if (aligned != sub->value_pos)
1878 if (!is_array_append)
1880 if (!_dbus_string_insert_bytes (sub->value_str,
1882 aligned - sub->value_pos,
1884 _dbus_assert_not_reached ("should not have failed to insert alignment padding");
1887 sub->value_pos = aligned;
1890 sub->u.array.start_pos = sub->value_pos;
1892 if (is_array_append)
1896 _dbus_assert (_DBUS_ALIGN_VALUE (sub->u.array.len_pos, 4) ==
1897 (unsigned) sub->u.array.len_pos);
1898 len = _dbus_unpack_uint32 (sub->byte_order,
1899 _dbus_string_get_const_data_len (sub->value_str,
1900 sub->u.array.len_pos,
1903 sub->value_pos += len;
1908 /* not enabled, so we won't write the len_pos; set it to -1 to so indicate */
1909 sub->u.array.len_pos = -1;
1910 sub->u.array.start_pos = sub->value_pos;
1913 _dbus_assert (sub->u.array.len_pos < sub->u.array.start_pos);
1914 _dbus_assert (is_array_append || sub->u.array.start_pos == sub->value_pos);
1916 #if RECURSIVE_MARSHAL_WRITE_TRACE
1917 _dbus_verbose (" type writer %p recurse array done remaining sig '%s' array start_pos = %d len_pos = %d value_pos = %d\n", sub,
1919 _dbus_string_get_const_data_len (sub->type_str, sub->type_pos, 0) :
1921 sub->u.array.start_pos, sub->u.array.len_pos, sub->value_pos);
1927 /* Variant value will normally have:
1928 * 1 byte signature length not including nul
1929 * signature typecodes (nul terminated)
1930 * padding to alignment of contained type
1931 * body according to signature
1933 * The signature string can only have a single type
1934 * in it but that type may be complex/recursive.
1936 * So a typical variant type with the integer 3 will have these
1938 * 0x1 'i' '\0' [1 byte padding to alignment boundary] 0x0 0x0 0x0 0x3
1940 * The main world of hurt for writing out a variant is that the type
1941 * string is the same string as the value string. Which means
1942 * inserting to the type string will move the value_pos; and it means
1943 * that inserting to the type string could break type alignment.
1946 writer_recurse_variant (DBusTypeWriter *writer,
1947 const DBusString *contained_type,
1948 int contained_type_start,
1949 int contained_type_len,
1950 DBusTypeWriter *sub)
1952 int contained_alignment;
1954 if (writer->enabled)
1956 /* Allocate space for the worst case, which is 1 byte sig
1957 * length, nul byte at end of sig, and 7 bytes padding to
1960 if (!_dbus_string_alloc_space (sub->value_str, contained_type_len + 9))
1964 /* write VARIANT typecode to the parent's type string */
1965 if (!write_or_verify_typecode (writer, DBUS_TYPE_VARIANT))
1968 /* If not enabled, mark that we have no type_str anymore ... */
1970 if (!writer->enabled)
1972 sub->type_str = NULL;
1978 /* If we're enabled then continue ... */
1980 if (!_dbus_string_insert_byte (sub->value_str,
1982 contained_type_len))
1983 _dbus_assert_not_reached ("should not have failed to insert variant type sig len");
1985 sub->value_pos += 1;
1987 /* Here we switch over to the expected type sig we're about to write */
1988 sub->type_str = sub->value_str;
1989 sub->type_pos = sub->value_pos;
1991 if (!_dbus_string_copy_len (contained_type, contained_type_start, contained_type_len,
1992 sub->value_str, sub->value_pos))
1993 _dbus_assert_not_reached ("should not have failed to insert variant type sig");
1995 sub->value_pos += contained_type_len;
1997 if (!_dbus_string_insert_byte (sub->value_str,
2000 _dbus_assert_not_reached ("should not have failed to insert variant type nul termination");
2002 sub->value_pos += 1;
2004 contained_alignment = _dbus_type_get_alignment (_dbus_first_type_in_signature (contained_type, contained_type_start));
2006 if (!_dbus_string_insert_bytes (sub->value_str,
2008 _DBUS_ALIGN_VALUE (sub->value_pos, contained_alignment) - sub->value_pos,
2010 _dbus_assert_not_reached ("should not have failed to insert alignment padding for variant body");
2011 sub->value_pos = _DBUS_ALIGN_VALUE (sub->value_pos, contained_alignment);
2017 _dbus_type_writer_recurse_contained_len (DBusTypeWriter *writer,
2019 const DBusString *contained_type,
2020 int contained_type_start,
2021 int contained_type_len,
2022 DBusTypeWriter *sub,
2023 dbus_bool_t is_array_append)
2025 writer_recurse_init_and_check (writer, container_type, sub);
2027 switch (container_type)
2029 case DBUS_TYPE_STRUCT:
2030 return writer_recurse_struct (writer,
2031 contained_type, contained_type_start, contained_type_len,
2034 case DBUS_TYPE_ARRAY:
2035 return writer_recurse_array (writer,
2036 contained_type, contained_type_start, contained_type_len,
2037 sub, is_array_append);
2039 case DBUS_TYPE_VARIANT:
2040 return writer_recurse_variant (writer,
2041 contained_type, contained_type_start, contained_type_len,
2045 _dbus_assert_not_reached ("tried to recurse into type that doesn't support that");
2052 * Opens a new container and writes out the initial information for that container.
2054 * @param writer the writer
2055 * @param container_type the type of the container to open
2056 * @param contained_type the array element type or variant content type
2057 * @param contained_type_start position to look for the type
2058 * @param sub the new sub-writer to write container contents
2059 * @returns #FALSE if no memory
2062 _dbus_type_writer_recurse (DBusTypeWriter *writer,
2064 const DBusString *contained_type,
2065 int contained_type_start,
2066 DBusTypeWriter *sub)
2068 int contained_type_len;
2071 contained_type_len = find_len_of_complete_type (contained_type, contained_type_start);
2073 contained_type_len = 0;
2075 return _dbus_type_writer_recurse_contained_len (writer, container_type,
2077 contained_type_start,
2084 * Append to an existing array. Essentially, the writer will read an
2085 * existing length at the write location; jump over that length; and
2086 * write new fields. On unrecurse(), the existing length will be
2089 * @param writer the writer
2090 * @param contained_type element type
2091 * @param contained_type_start position of element type
2092 * @param sub the subwriter to init
2093 * @returns #FALSE if no memory
2096 _dbus_type_writer_append_array (DBusTypeWriter *writer,
2097 const DBusString *contained_type,
2098 int contained_type_start,
2099 DBusTypeWriter *sub)
2101 int contained_type_len;
2104 contained_type_len = find_len_of_complete_type (contained_type, contained_type_start);
2106 contained_type_len = 0;
2108 return _dbus_type_writer_recurse_contained_len (writer, DBUS_TYPE_ARRAY,
2110 contained_type_start,
2117 writer_get_array_len (DBusTypeWriter *writer)
2119 _dbus_assert (writer->container_type == DBUS_TYPE_ARRAY);
2120 return writer->value_pos - writer->u.array.start_pos;
2124 * Closes a container created by _dbus_type_writer_recurse()
2125 * and writes any additional information to the values block.
2127 * @param writer the writer
2128 * @param sub the sub-writer created by _dbus_type_writer_recurse()
2129 * @returns #FALSE if no memory
2132 _dbus_type_writer_unrecurse (DBusTypeWriter *writer,
2133 DBusTypeWriter *sub)
2135 /* type_pos_is_expectation never gets unset once set, or we'd get all hosed */
2136 _dbus_assert (!writer->type_pos_is_expectation ||
2137 (writer->type_pos_is_expectation && sub->type_pos_is_expectation));
2139 #if RECURSIVE_MARSHAL_WRITE_TRACE
2140 _dbus_verbose (" type writer %p unrecurse type_pos = %d value_pos = %d is_expectation = %d container_type = %s\n",
2141 writer, writer->type_pos, writer->value_pos, writer->type_pos_is_expectation,
2142 _dbus_type_to_string (writer->container_type));
2143 _dbus_verbose (" type writer %p unrecurse sub type_pos = %d value_pos = %d is_expectation = %d container_type = %s\n",
2144 sub, sub->type_pos, sub->value_pos,
2145 sub->type_pos_is_expectation,
2146 _dbus_type_to_string (sub->container_type));
2149 if (sub->container_type == DBUS_TYPE_STRUCT)
2151 if (!write_or_verify_typecode (sub, DBUS_STRUCT_END_CHAR))
2154 else if (sub->container_type == DBUS_TYPE_ARRAY)
2156 if (sub->u.array.len_pos >= 0) /* len_pos == -1 if we weren't enabled when we passed it */
2160 /* Set the array length */
2161 len = writer_get_array_len (sub);
2162 _dbus_marshal_set_uint32 (sub->value_str,
2163 sub->u.array.len_pos,
2166 #if RECURSIVE_MARSHAL_WRITE_TRACE
2167 _dbus_verbose (" filled in sub array len to %u at len_pos %d\n",
2168 len, sub->u.array.len_pos);
2171 #if RECURSIVE_MARSHAL_WRITE_TRACE
2174 _dbus_verbose (" not filling in sub array len because we were disabled when we passed the len\n");
2179 /* Now get type_pos right for the parent writer. Here are the cases:
2181 * Cases !writer->type_pos_is_expectation:
2182 * (in these cases we want to update to the new insertion point)
2184 * - if we recursed into a STRUCT then we didn't know in advance
2185 * what the types in the struct would be; so we have to fill in
2186 * that information now.
2187 * writer->type_pos = sub->type_pos
2189 * - if we recursed into anything else, we knew the full array
2190 * type, or knew the single typecode marking VARIANT, so
2191 * writer->type_pos is already correct.
2192 * writer->type_pos should remain as-is
2194 * - note that the parent is never an ARRAY or VARIANT, if it were
2195 * then type_pos_is_expectation would be TRUE. The parent
2196 * is thus known to be a toplevel or STRUCT.
2198 * Cases where writer->type_pos_is_expectation:
2199 * (in these cases we want to update to next expected type to write)
2201 * - we recursed from STRUCT into STRUCT and we didn't increment
2202 * type_pos in the parent just to stay consistent with the
2203 * !writer->type_pos_is_expectation case (though we could
2204 * special-case this in recurse_struct instead if we wanted)
2205 * writer->type_pos = sub->type_pos
2207 * - we recursed from STRUCT into ARRAY or VARIANT and type_pos
2208 * for parent should have been incremented already
2209 * writer->type_pos should remain as-is
2211 * - we recursed from ARRAY into a sub-element, so type_pos in the
2212 * parent is the element type and should remain the element type
2213 * for the benefit of the next child element
2214 * writer->type_pos should remain as-is
2216 * - we recursed from VARIANT into its value, so type_pos in the
2217 * parent makes no difference since there's only one value
2218 * and we just finished writing it and won't use type_pos again
2219 * writer->type_pos should remain as-is
2221 if (writer->type_str != NULL)
2223 if (sub->container_type == DBUS_TYPE_STRUCT &&
2224 (writer->container_type == DBUS_TYPE_STRUCT ||
2225 writer->container_type == DBUS_TYPE_INVALID))
2227 /* Advance the parent to the next struct field */
2228 writer->type_pos = sub->type_pos;
2232 writer->value_pos = sub->value_pos;
2234 #if RECURSIVE_MARSHAL_WRITE_TRACE
2235 _dbus_verbose (" type writer %p unrecursed type_pos = %d value_pos = %d remaining sig '%s'\n",
2236 writer, writer->type_pos, writer->value_pos,
2238 _dbus_string_get_const_data_len (writer->type_str, writer->type_pos, 0) :
2246 * Writes out a basic type.
2248 * @param writer the writer
2249 * @param type the type to write
2250 * @param value the address of the value to write
2251 * @returns #FALSE if no memory
2254 _dbus_type_writer_write_basic (DBusTypeWriter *writer,
2260 /* First ensure that our type realloc will succeed */
2261 if (!writer->type_pos_is_expectation && writer->type_str != NULL)
2263 if (!_dbus_string_alloc_space (writer->type_str, 1))
2269 if (!_dbus_type_writer_write_basic_no_typecode (writer, type, value))
2272 if (!write_or_verify_typecode (writer, type))
2273 _dbus_assert_not_reached ("failed to write typecode after prealloc");
2278 #if RECURSIVE_MARSHAL_WRITE_TRACE
2279 _dbus_verbose (" type writer %p basic type_pos = %d value_pos = %d is_expectation = %d enabled = %d\n",
2280 writer, writer->type_pos, writer->value_pos, writer->type_pos_is_expectation,
2288 * Writes a block of fixed-length basic values, i.e. those that are
2289 * both _dbus_type_is_fixed() and _dbus_type_is_basic(). The block
2290 * must be written inside an array.
2292 * The value parameter should be the address of said array of values,
2293 * so e.g. if it's an array of double, pass in "const double**"
2295 * @param writer the writer
2296 * @param element_type type of stuff in the array
2297 * @param value address of the array
2298 * @param n_elements number of elements in the array
2299 * @returns #FALSE if no memory
2302 _dbus_type_writer_write_fixed_multi (DBusTypeWriter *writer,
2307 _dbus_assert (writer->container_type == DBUS_TYPE_ARRAY);
2308 _dbus_assert (_dbus_type_is_fixed (element_type));
2309 _dbus_assert (writer->type_pos_is_expectation);
2310 _dbus_assert (n_elements >= 0);
2312 #if RECURSIVE_MARSHAL_WRITE_TRACE
2313 _dbus_verbose (" type writer %p entering fixed multi type_pos = %d value_pos = %d n_elements %d\n",
2314 writer, writer->type_pos, writer->value_pos, n_elements);
2317 if (!write_or_verify_typecode (writer, element_type))
2318 _dbus_assert_not_reached ("OOM should not happen if only verifying typecode");
2320 if (writer->enabled)
2322 if (!_dbus_marshal_write_fixed_multi (writer->value_str,
2328 &writer->value_pos))
2332 #if RECURSIVE_MARSHAL_WRITE_TRACE
2333 _dbus_verbose (" type writer %p fixed multi written new type_pos = %d new value_pos = %d n_elements %d\n",
2334 writer, writer->type_pos, writer->value_pos, n_elements);
2341 enable_if_after (DBusTypeWriter *writer,
2342 DBusTypeReader *reader,
2343 const DBusTypeReader *start_after)
2347 if (!writer->enabled && _dbus_type_reader_greater_than (reader, start_after))
2349 _dbus_type_writer_set_enabled (writer, TRUE);
2350 #if RECURSIVE_MARSHAL_WRITE_TRACE
2351 _dbus_verbose ("ENABLING writer %p at %d because reader at value_pos %d is after reader at value_pos %d\n",
2352 writer, writer->value_pos, reader->value_pos, start_after->value_pos);
2356 _dbus_assert ((!writer->enabled && !_dbus_type_reader_greater_than (reader, start_after)) ||
2357 (writer->enabled && _dbus_type_reader_greater_than (reader, start_after)));
2362 append_fixup (DBusList **fixups,
2363 const DBusArrayLenFixup *fixup)
2365 DBusArrayLenFixup *f;
2367 f = dbus_new (DBusArrayLenFixup, 1);
2373 if (!_dbus_list_append (fixups, f))
2379 _dbus_assert (f->len_pos_in_reader == fixup->len_pos_in_reader);
2380 _dbus_assert (f->new_len == fixup->new_len);
2385 /* This loop is trivial if you ignore all the start_after nonsense,
2386 * so if you're trying to figure it out, start by ignoring that
2389 writer_write_reader_helper (DBusTypeWriter *writer,
2390 DBusTypeReader *reader,
2391 const DBusTypeReader *start_after,
2392 int start_after_new_pos,
2393 int start_after_new_len,
2395 dbus_bool_t inside_start_after)
2399 while ((current_type = _dbus_type_reader_get_current_type (reader)) != DBUS_TYPE_INVALID)
2401 if (_dbus_type_is_container (current_type))
2403 DBusTypeReader subreader;
2404 DBusTypeWriter subwriter;
2405 const DBusString *sig_str;
2408 dbus_bool_t enabled_at_recurse;
2409 dbus_bool_t past_start_after;
2410 int reader_array_len_pos;
2411 int reader_array_start_pos;
2412 dbus_bool_t this_is_start_after;
2414 /* type_pos is checked since e.g. in a struct the struct
2415 * and its first field have the same value_pos.
2416 * type_str will differ in reader/start_after for variants
2417 * where type_str is inside the value_str
2419 if (!inside_start_after && start_after &&
2420 reader->value_pos == start_after->value_pos &&
2421 reader->type_str == start_after->type_str &&
2422 reader->type_pos == start_after->type_pos)
2423 this_is_start_after = TRUE;
2425 this_is_start_after = FALSE;
2427 _dbus_type_reader_recurse (reader, &subreader);
2429 if (current_type == DBUS_TYPE_ARRAY)
2431 reader_array_len_pos = ARRAY_READER_LEN_POS (&subreader);
2432 reader_array_start_pos = subreader.u.array.start_pos;
2437 reader_array_len_pos = -1;
2438 reader_array_start_pos = -1;
2441 _dbus_type_reader_get_signature (&subreader, &sig_str,
2442 &sig_start, &sig_len);
2444 #if RECURSIVE_MARSHAL_WRITE_TRACE
2445 _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",
2446 _dbus_type_to_string (current_type),
2448 subreader.value_pos,
2450 start_after ? start_after->value_pos : -1,
2451 _dbus_string_get_length (writer->value_str),
2452 inside_start_after, this_is_start_after);
2455 if (!inside_start_after && !this_is_start_after)
2456 enable_if_after (writer, &subreader, start_after);
2457 enabled_at_recurse = writer->enabled;
2458 if (!_dbus_type_writer_recurse_contained_len (writer, current_type,
2459 sig_str, sig_start, sig_len,
2463 #if RECURSIVE_MARSHAL_WRITE_TRACE
2464 _dbus_verbose ("recursed into subwriter at %d write target len %d\n",
2465 subwriter.value_pos,
2466 _dbus_string_get_length (subwriter.value_str));
2469 if (!writer_write_reader_helper (&subwriter, &subreader, start_after,
2470 start_after_new_pos, start_after_new_len,
2472 inside_start_after ||
2473 this_is_start_after))
2476 #if RECURSIVE_MARSHAL_WRITE_TRACE
2477 _dbus_verbose ("about to unrecurse from %s subreader at %d writer at %d subwriter at %d write target len %d\n",
2478 _dbus_type_to_string (current_type),
2479 subreader.value_pos,
2481 subwriter.value_pos,
2482 _dbus_string_get_length (writer->value_str));
2485 if (!inside_start_after && !this_is_start_after)
2486 enable_if_after (writer, &subreader, start_after);
2487 past_start_after = writer->enabled;
2488 if (!_dbus_type_writer_unrecurse (writer, &subwriter))
2491 /* If we weren't enabled when we recursed, we didn't
2492 * write an array len; if we passed start_after
2493 * somewhere inside the array, then we need to generate
2496 if (start_after != NULL &&
2497 !enabled_at_recurse && past_start_after &&
2498 current_type == DBUS_TYPE_ARRAY &&
2501 DBusArrayLenFixup fixup;
2502 int bytes_written_after_start_after;
2503 int bytes_before_start_after;
2506 /* this subwriter access is moderately unkosher since we
2507 * already unrecursed, but it works as long as unrecurse
2508 * doesn't break us on purpose
2510 bytes_written_after_start_after = writer_get_array_len (&subwriter);
2512 bytes_before_start_after =
2513 start_after->value_pos - reader_array_start_pos;
2515 fixup.len_pos_in_reader = reader_array_len_pos;
2517 bytes_before_start_after +
2518 start_after_new_len +
2519 bytes_written_after_start_after;
2521 _dbus_assert (_DBUS_ALIGN_VALUE (fixup.len_pos_in_reader, 4) ==
2522 (unsigned) fixup.len_pos_in_reader);
2524 old_len = _dbus_unpack_uint32 (reader->byte_order,
2525 _dbus_string_get_const_data_len (reader->value_str,
2526 fixup.len_pos_in_reader, 4));
2528 if (old_len != fixup.new_len && !append_fixup (fixups, &fixup))
2531 #if RECURSIVE_MARSHAL_WRITE_TRACE
2532 _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",
2533 fixup.len_pos_in_reader,
2535 reader_array_start_pos,
2536 start_after->value_pos,
2537 bytes_before_start_after,
2538 start_after_new_len,
2539 bytes_written_after_start_after);
2547 _dbus_assert (_dbus_type_is_basic (current_type));
2549 #if RECURSIVE_MARSHAL_WRITE_TRACE
2550 _dbus_verbose ("Reading basic value %s at %d\n",
2551 _dbus_type_to_string (current_type),
2555 _dbus_type_reader_read_basic (reader, &val);
2557 #if RECURSIVE_MARSHAL_WRITE_TRACE
2558 _dbus_verbose ("Writing basic value %s at %d write target len %d inside_start_after = %d\n",
2559 _dbus_type_to_string (current_type),
2561 _dbus_string_get_length (writer->value_str),
2562 inside_start_after);
2564 if (!inside_start_after)
2565 enable_if_after (writer, reader, start_after);
2566 if (!_dbus_type_writer_write_basic (writer, current_type, &val))
2568 #if RECURSIVE_MARSHAL_WRITE_TRACE
2569 _dbus_verbose ("Wrote basic value %s, new value_pos %d write target len %d\n",
2570 _dbus_type_to_string (current_type),
2572 _dbus_string_get_length (writer->value_str));
2576 _dbus_type_reader_next (reader);
2583 apply_and_free_fixups (fixups, NULL); /* NULL for reader to apply to */
2589 * Iterate through all values in the given reader, writing a copy of
2590 * each value to the writer. The reader will be moved forward to its
2593 * If a reader start_after is provided, it should be a reader for the
2594 * same data as the reader to be written. Only values occurring after
2595 * the value pointed to by start_after will be written to the writer.
2597 * If start_after is provided, then the copy of the reader will be
2598 * partial. This means that array lengths will not have been copied.
2599 * The assumption is that you wrote a new version of the value at
2600 * start_after to the writer. You have to pass in the start position
2601 * and length of the new value. (If you are deleting the value
2602 * at start_after, pass in 0 for the length.)
2604 * If the fixups parameter is non-#NULL, then any array length that
2605 * was read but not written due to start_after will be provided
2606 * as a #DBusArrayLenFixup. The fixup contains the position of the
2607 * array length in the source data, and the correct array length
2608 * assuming you combine the source data before start_after with
2609 * the written data at start_after and beyond.
2611 * @param writer the writer to copy to
2612 * @param reader the reader to copy from
2613 * @param start_after #NULL or a reader showing where to start
2614 * @param start_after_new_pos the position of start_after equivalent in the target data
2615 * @param start_after_new_len the length of start_after equivalent in the target data
2616 * @param fixups list to append #DBusArrayLenFixup if the write was partial
2617 * @returns #FALSE if no memory
2620 _dbus_type_writer_write_reader_partial (DBusTypeWriter *writer,
2621 DBusTypeReader *reader,
2622 const DBusTypeReader *start_after,
2623 int start_after_new_pos,
2624 int start_after_new_len,
2627 DBusTypeWriter orig;
2634 orig_type_len = _dbus_string_get_length (writer->type_str);
2635 orig_value_len = _dbus_string_get_length (writer->value_str);
2636 orig_enabled = writer->enabled;
2639 _dbus_type_writer_set_enabled (writer, FALSE);
2641 if (!writer_write_reader_helper (writer, reader, start_after,
2642 start_after_new_pos,
2643 start_after_new_len,
2647 _dbus_type_writer_set_enabled (writer, orig_enabled);
2651 if (!writer->type_pos_is_expectation)
2653 new_bytes = _dbus_string_get_length (writer->type_str) - orig_type_len;
2654 _dbus_string_delete (writer->type_str, orig.type_pos, new_bytes);
2656 new_bytes = _dbus_string_get_length (writer->value_str) - orig_value_len;
2657 _dbus_string_delete (writer->value_str, orig.value_pos, new_bytes);
2665 * Iterate through all values in the given reader, writing a copy of
2666 * each value to the writer. The reader will be moved forward to its
2669 * @param writer the writer to copy to
2670 * @param reader the reader to copy from
2671 * @returns #FALSE if no memory
2674 _dbus_type_writer_write_reader (DBusTypeWriter *writer,
2675 DBusTypeReader *reader)
2677 return _dbus_type_writer_write_reader_partial (writer, reader, NULL, 0, 0, NULL);
2681 * If disabled, a writer can still be iterated forward and recursed/unrecursed
2682 * but won't write any values. Types will still be written unless the
2683 * writer is a "values only" writer, because the writer needs access to
2684 * a valid signature to be able to iterate.
2686 * @param writer the type writer
2687 * @param enabled #TRUE if values should be written
2690 _dbus_type_writer_set_enabled (DBusTypeWriter *writer,
2691 dbus_bool_t enabled)
2693 writer->enabled = enabled != FALSE;
2696 /** @} */ /* end of DBusMarshal group */
2698 /* tests in dbus-marshal-recursive-util.c */