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_or_dict_entry_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 ||
169 _dbus_string_get_byte (sub->type_str,
170 sub->type_pos) == DBUS_DICT_ENTRY_BEGIN_CHAR);
176 struct_or_dict_entry_reader_recurse (DBusTypeReader *sub,
177 DBusTypeReader *parent)
179 struct_or_dict_entry_types_only_reader_recurse (sub, parent);
181 /* struct and dict entry have 8 byte alignment */
182 sub->value_pos = _DBUS_ALIGN_VALUE (sub->value_pos, 8);
186 array_types_only_reader_recurse (DBusTypeReader *sub,
187 DBusTypeReader *parent)
189 base_reader_recurse (sub, parent);
191 /* point type_pos at the array element type */
194 /* Init with values likely to crash things if misused */
195 sub->u.array.start_pos = _DBUS_INT_MAX;
196 sub->array_len_offset = 7;
199 /** compute position of array length given array_len_offset, which is
200 the offset back from start_pos to end of the len */
201 #define ARRAY_READER_LEN_POS(reader) \
202 ((reader)->u.array.start_pos - ((int)(reader)->array_len_offset) - 4)
205 array_reader_get_array_len (const DBusTypeReader *reader)
207 dbus_uint32_t array_len;
210 len_pos = ARRAY_READER_LEN_POS (reader);
212 _dbus_assert (_DBUS_ALIGN_VALUE (len_pos, 4) == (unsigned) len_pos);
213 array_len = _dbus_unpack_uint32 (reader->byte_order,
214 _dbus_string_get_const_data_len (reader->value_str, len_pos, 4));
216 #if RECURSIVE_MARSHAL_READ_TRACE
217 _dbus_verbose (" reader %p len_pos %d array len %u len_offset %d\n",
218 reader, len_pos, array_len, reader->array_len_offset);
221 _dbus_assert (reader->u.array.start_pos - len_pos - 4 < 8);
227 array_reader_recurse (DBusTypeReader *sub,
228 DBusTypeReader *parent)
233 array_types_only_reader_recurse (sub, parent);
235 sub->value_pos = _DBUS_ALIGN_VALUE (sub->value_pos, 4);
237 len_pos = sub->value_pos;
239 sub->value_pos += 4; /* for the length */
241 alignment = element_type_get_alignment (sub->type_str,
244 sub->value_pos = _DBUS_ALIGN_VALUE (sub->value_pos, alignment);
246 sub->u.array.start_pos = sub->value_pos;
247 _dbus_assert ((sub->u.array.start_pos - (len_pos + 4)) < 8); /* only 3 bits in array_len_offset */
248 sub->array_len_offset = sub->u.array.start_pos - (len_pos + 4);
250 #if RECURSIVE_MARSHAL_READ_TRACE
251 _dbus_verbose (" type reader %p array start = %d len_offset = %d array len = %d array element type = %s\n",
253 sub->u.array.start_pos,
254 sub->array_len_offset,
255 array_reader_get_array_len (sub),
256 _dbus_type_to_string (_dbus_first_type_in_signature (sub->type_str,
262 variant_reader_recurse (DBusTypeReader *sub,
263 DBusTypeReader *parent)
266 int contained_alignment;
268 base_reader_recurse (sub, parent);
270 /* Variant is 1 byte sig length (without nul), signature with nul,
271 * padding to 8-boundary, then values
274 sig_len = _dbus_string_get_byte (sub->value_str, sub->value_pos);
276 sub->type_str = sub->value_str;
277 sub->type_pos = sub->value_pos + 1;
279 sub->value_pos = sub->type_pos + sig_len + 1;
281 contained_alignment = _dbus_type_get_alignment (_dbus_first_type_in_signature (sub->type_str,
284 sub->value_pos = _DBUS_ALIGN_VALUE (sub->value_pos, contained_alignment);
286 #if RECURSIVE_MARSHAL_READ_TRACE
287 _dbus_verbose (" type reader %p variant containing '%s'\n",
289 _dbus_string_get_const_data_len (sub->type_str,
295 array_reader_check_finished (const DBusTypeReader *reader)
299 /* return the array element type if elements remain, and
300 * TYPE_INVALID otherwise
303 end_pos = reader->u.array.start_pos + array_reader_get_array_len (reader);
305 _dbus_assert (reader->value_pos <= end_pos);
306 _dbus_assert (reader->value_pos >= reader->u.array.start_pos);
308 return reader->value_pos == end_pos;
311 /* this is written a little oddly to try and overoptimize */
313 skip_one_complete_type (const DBusString *type_str,
316 const unsigned char *p;
317 const unsigned char *start;
319 _dbus_assert (type_str != NULL);
320 _dbus_assert (type_pos != NULL);
322 start = _dbus_string_get_const_data (type_str);
323 p = start + *type_pos;
325 _dbus_assert (*p != DBUS_STRUCT_END_CHAR);
326 _dbus_assert (*p != DBUS_DICT_ENTRY_END_CHAR);
328 while (*p == DBUS_TYPE_ARRAY)
331 _dbus_assert (*p != DBUS_STRUCT_END_CHAR);
332 _dbus_assert (*p != DBUS_DICT_ENTRY_END_CHAR);
334 if (*p == DBUS_STRUCT_BEGIN_CHAR)
342 _dbus_assert (*p != DBUS_TYPE_INVALID);
346 _dbus_assert (*p != DBUS_TYPE_INVALID);
348 if (*p == DBUS_STRUCT_BEGIN_CHAR)
350 else if (*p == DBUS_STRUCT_END_CHAR)
361 else if (*p == DBUS_DICT_ENTRY_BEGIN_CHAR)
369 _dbus_assert (*p != DBUS_TYPE_INVALID);
373 _dbus_assert (*p != DBUS_TYPE_INVALID);
375 if (*p == DBUS_DICT_ENTRY_BEGIN_CHAR)
377 else if (*p == DBUS_DICT_ENTRY_END_CHAR)
393 *type_pos = (int) (p - start);
397 find_len_of_complete_type (const DBusString *type_str,
404 skip_one_complete_type (type_str, &end);
406 return end - type_pos;
410 base_reader_next (DBusTypeReader *reader,
413 switch (current_type)
415 case DBUS_TYPE_DICT_ENTRY:
416 case DBUS_TYPE_STRUCT:
417 case DBUS_TYPE_VARIANT:
418 /* Scan forward over the entire container contents */
422 if (reader->klass->types_only && current_type == DBUS_TYPE_VARIANT)
426 /* Recurse into the struct or variant */
427 _dbus_type_reader_recurse (reader, &sub);
429 /* Skip everything in this subreader */
430 while (_dbus_type_reader_next (&sub))
435 if (!reader->klass->types_only)
436 reader->value_pos = sub.value_pos;
438 /* Now we are at the end of this container; for variants, the
439 * subreader's type_pos is totally inapplicable (it's in the
440 * value string) but we know that we increment by one past the
443 if (current_type == DBUS_TYPE_VARIANT)
444 reader->type_pos += 1;
446 reader->type_pos = sub.type_pos;
450 case DBUS_TYPE_ARRAY:
452 if (!reader->klass->types_only)
453 _dbus_marshal_skip_array (reader->value_str,
454 _dbus_first_type_in_signature (reader->type_str,
455 reader->type_pos + 1),
459 skip_one_complete_type (reader->type_str, &reader->type_pos);
464 if (!reader->klass->types_only)
465 _dbus_marshal_skip_basic (reader->value_str,
466 current_type, reader->byte_order,
469 reader->type_pos += 1;
475 struct_reader_next (DBusTypeReader *reader,
480 base_reader_next (reader, current_type);
482 /* for STRUCT containers we return FALSE at the end of the struct,
483 * for INVALID we return FALSE at the end of the signature.
484 * In both cases we arrange for get_current_type() to return INVALID
485 * which is defined to happen iff we're at the end (no more next())
487 t = _dbus_string_get_byte (reader->type_str, reader->type_pos);
488 if (t == DBUS_STRUCT_END_CHAR)
490 reader->type_pos += 1;
491 reader->finished = TRUE;
496 dict_entry_reader_next (DBusTypeReader *reader,
501 base_reader_next (reader, current_type);
503 /* for STRUCT containers we return FALSE at the end of the struct,
504 * for INVALID we return FALSE at the end of the signature.
505 * In both cases we arrange for get_current_type() to return INVALID
506 * which is defined to happen iff we're at the end (no more next())
508 t = _dbus_string_get_byte (reader->type_str, reader->type_pos);
509 if (t == DBUS_DICT_ENTRY_END_CHAR)
511 reader->type_pos += 1;
512 reader->finished = TRUE;
517 array_types_only_reader_next (DBusTypeReader *reader,
520 /* We have one "element" to be iterated over
521 * in each array, which is its element type.
522 * So the finished flag indicates whether we've
523 * iterated over it yet or not.
525 reader->finished = TRUE;
529 array_reader_next (DBusTypeReader *reader,
532 /* Skip one array element */
535 end_pos = reader->u.array.start_pos + array_reader_get_array_len (reader);
537 #if RECURSIVE_MARSHAL_READ_TRACE
538 _dbus_verbose (" reader %p array next START start_pos = %d end_pos = %d value_pos = %d current_type = %s\n",
540 reader->u.array.start_pos,
541 end_pos, reader->value_pos,
542 _dbus_type_to_string (current_type));
545 _dbus_assert (reader->value_pos < end_pos);
546 _dbus_assert (reader->value_pos >= reader->u.array.start_pos);
548 switch (_dbus_first_type_in_signature (reader->type_str,
551 case DBUS_TYPE_DICT_ENTRY:
552 case DBUS_TYPE_STRUCT:
553 case DBUS_TYPE_VARIANT:
557 /* Recurse into the struct or variant */
558 _dbus_type_reader_recurse (reader, &sub);
560 /* Skip everything in this element */
561 while (_dbus_type_reader_next (&sub))
566 /* Now we are at the end of this element */
567 reader->value_pos = sub.value_pos;
571 case DBUS_TYPE_ARRAY:
573 _dbus_marshal_skip_array (reader->value_str,
574 _dbus_first_type_in_signature (reader->type_str,
575 reader->type_pos + 1),
583 _dbus_marshal_skip_basic (reader->value_str,
584 current_type, reader->byte_order,
590 #if RECURSIVE_MARSHAL_READ_TRACE
591 _dbus_verbose (" reader %p array next END start_pos = %d end_pos = %d value_pos = %d current_type = %s\n",
593 reader->u.array.start_pos,
594 end_pos, reader->value_pos,
595 _dbus_type_to_string (current_type));
598 _dbus_assert (reader->value_pos <= end_pos);
600 if (reader->value_pos == end_pos)
602 skip_one_complete_type (reader->type_str,
608 array_init_from_mark (DBusTypeReader *reader,
609 const DBusTypeMark *mark)
611 /* Fill in the array-specific fields from the mark. The general
612 * fields are already filled in.
614 reader->u.array.start_pos = mark->array_start_pos;
615 reader->array_len_offset = mark->array_len_offset;
618 static const DBusTypeReaderClass body_reader_class = {
621 NULL, /* body is always toplevel, so doesn't get recursed into */
627 static const DBusTypeReaderClass body_types_only_reader_class = {
630 NULL, /* body is always toplevel, so doesn't get recursed into */
636 static const DBusTypeReaderClass struct_reader_class = {
639 struct_or_dict_entry_reader_recurse,
645 static const DBusTypeReaderClass struct_types_only_reader_class = {
648 struct_or_dict_entry_types_only_reader_recurse,
654 static const DBusTypeReaderClass dict_entry_reader_class = {
657 struct_or_dict_entry_reader_recurse,
659 dict_entry_reader_next,
663 static const DBusTypeReaderClass dict_entry_types_only_reader_class = {
664 "dict_entry types", 5,
666 struct_or_dict_entry_types_only_reader_recurse,
668 dict_entry_reader_next,
672 static const DBusTypeReaderClass array_reader_class = {
675 array_reader_recurse,
676 array_reader_check_finished,
681 static const DBusTypeReaderClass array_types_only_reader_class = {
684 array_types_only_reader_recurse,
686 array_types_only_reader_next,
690 static const DBusTypeReaderClass variant_reader_class = {
693 variant_reader_recurse,
699 static const DBusTypeReaderClass const *
700 all_reader_classes[] = {
702 &body_types_only_reader_class,
703 &struct_reader_class,
704 &struct_types_only_reader_class,
705 &dict_entry_reader_class,
706 &dict_entry_types_only_reader_class,
708 &array_types_only_reader_class,
709 &variant_reader_class
713 * Initializes a type reader.
715 * @param reader the reader
716 * @param byte_order the byte order of the block to read
717 * @param type_str the signature of the block to read
718 * @param type_pos location of signature
719 * @param value_str the string containing values block
720 * @param value_pos start of values block
723 _dbus_type_reader_init (DBusTypeReader *reader,
725 const DBusString *type_str,
727 const DBusString *value_str,
730 reader->klass = &body_reader_class;
732 reader_init (reader, byte_order, type_str, type_pos,
733 value_str, value_pos);
735 #if RECURSIVE_MARSHAL_READ_TRACE
736 _dbus_verbose (" type reader %p init type_pos = %d value_pos = %d remaining sig '%s'\n",
737 reader, reader->type_pos, reader->value_pos,
738 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0));
743 * Initializes a type reader that's been compressed into a
744 * DBusTypeMark. The args have to be the same as those passed in to
745 * create the original #DBusTypeReader.
747 * @param reader the reader
748 * @param byte_order the byte order of the value block
749 * @param type_str string containing the type signature
750 * @param value_str string containing the values block
751 * @param mark the mark to decompress from
754 _dbus_type_reader_init_from_mark (DBusTypeReader *reader,
756 const DBusString *type_str,
757 const DBusString *value_str,
758 const DBusTypeMark *mark)
760 reader->klass = all_reader_classes[mark->container_type];
762 reader_init (reader, byte_order,
763 mark->type_pos_in_value_str ? value_str : type_str,
765 value_str, mark->value_pos);
767 if (reader->klass->init_from_mark)
768 (* reader->klass->init_from_mark) (reader, mark);
770 #if RECURSIVE_MARSHAL_READ_TRACE
771 _dbus_verbose (" type reader %p init from mark type_pos = %d value_pos = %d remaining sig '%s'\n",
772 reader, reader->type_pos, reader->value_pos,
773 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0));
778 * Like _dbus_type_reader_init() but the iteration is over the
779 * signature, not over values.
781 * @param reader the reader
782 * @param type_str the signature string
783 * @param type_pos location in the signature string
786 _dbus_type_reader_init_types_only (DBusTypeReader *reader,
787 const DBusString *type_str,
790 reader->klass = &body_types_only_reader_class;
792 reader_init (reader, DBUS_COMPILER_BYTE_ORDER /* irrelevant */,
793 type_str, type_pos, NULL, _DBUS_INT_MAX /* crashes if we screw up */);
795 #if RECURSIVE_MARSHAL_READ_TRACE
796 _dbus_verbose (" type reader %p init types only type_pos = %d remaining sig '%s'\n",
797 reader, reader->type_pos,
798 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0));
803 * Like _dbus_type_reader_init_from_mark() but only iterates over
804 * the signature, not the values.
806 * @param reader the reader
807 * @param type_str the signature string
808 * @param mark the mark to decompress from
811 _dbus_type_reader_init_types_only_from_mark (DBusTypeReader *reader,
812 const DBusString *type_str,
813 const DBusTypeMark *mark)
815 reader->klass = all_reader_classes[mark->container_type];
816 _dbus_assert (reader->klass->types_only);
817 _dbus_assert (!mark->type_pos_in_value_str);
819 reader_init (reader, DBUS_COMPILER_BYTE_ORDER, /* irrelevant */
820 type_str, mark->type_pos,
821 NULL, _DBUS_INT_MAX /* crashes if we screw up */);
823 if (reader->klass->init_from_mark)
824 (* reader->klass->init_from_mark) (reader, mark);
826 #if RECURSIVE_MARSHAL_READ_TRACE
827 _dbus_verbose (" type reader %p init types only from mark type_pos = %d remaining sig '%s'\n",
828 reader, reader->type_pos,
829 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0));
834 * Compresses a type reader into a #DBusTypeMark, useful for example
835 * if you want to cache a bunch of positions in a block of values.
837 * @param reader the reader
838 * @param mark the mark to init
841 _dbus_type_reader_save_mark (const DBusTypeReader *reader,
844 mark->type_pos_in_value_str = (reader->type_str == reader->value_str);
845 mark->container_type = reader->klass->id;
846 _dbus_assert (all_reader_classes[reader->klass->id] == reader->klass);
848 mark->type_pos = reader->type_pos;
849 mark->value_pos = reader->value_pos;
851 /* these are just junk if the reader isn't really an array of course */
852 mark->array_len_offset = reader->array_len_offset;
853 mark->array_start_pos = reader->u.array.start_pos;
857 * Gets the type of the value the reader is currently pointing to;
858 * or for a types-only reader gets the type it's currently pointing to.
859 * If the reader is at the end of a block or end of a container such
860 * as an array, returns #DBUS_TYPE_INVALID.
862 * @param reader the reader
865 _dbus_type_reader_get_current_type (const DBusTypeReader *reader)
869 if (reader->finished ||
870 (reader->klass->check_finished &&
871 (* reader->klass->check_finished) (reader)))
872 t = DBUS_TYPE_INVALID;
874 t = _dbus_first_type_in_signature (reader->type_str,
877 _dbus_assert (t != DBUS_STRUCT_END_CHAR);
878 _dbus_assert (t != DBUS_STRUCT_BEGIN_CHAR);
879 _dbus_assert (t != DBUS_DICT_ENTRY_END_CHAR);
880 _dbus_assert (t != DBUS_DICT_ENTRY_BEGIN_CHAR);
883 _dbus_verbose (" type reader %p current type_pos = %d type = %s\n",
884 reader, reader->type_pos,
885 _dbus_type_to_string (t));
892 * Gets the type of an element of the array the reader is currently
893 * pointing to. It's an error to call this if
894 * _dbus_type_reader_get_current_type() doesn't return #DBUS_TYPE_ARRAY
897 * @param reader the reader
900 _dbus_type_reader_get_element_type (const DBusTypeReader *reader)
904 _dbus_assert (_dbus_type_reader_get_current_type (reader) == DBUS_TYPE_ARRAY);
906 element_type = _dbus_first_type_in_signature (reader->type_str,
907 reader->type_pos + 1);
913 * Gets the current position in the value block
914 * @param reader the reader
917 _dbus_type_reader_get_value_pos (const DBusTypeReader *reader)
919 return reader->value_pos;
923 * Get the address of the marshaled value in the data being read. The
924 * address may not be aligned; you have to align it to the type of the
925 * value you want to read. Most of the demarshal routines do this for
928 * @param reader the reader
929 * @param value_location the address of the marshaled value
932 _dbus_type_reader_read_raw (const DBusTypeReader *reader,
933 const unsigned char **value_location)
935 _dbus_assert (!reader->klass->types_only);
937 *value_location = _dbus_string_get_const_data_len (reader->value_str,
943 * Reads a basic-typed value, as with _dbus_marshal_read_basic().
945 * @param reader the reader
946 * @param value the address of the value
949 _dbus_type_reader_read_basic (const DBusTypeReader *reader,
954 _dbus_assert (!reader->klass->types_only);
956 t = _dbus_type_reader_get_current_type (reader);
958 _dbus_marshal_read_basic (reader->value_str,
965 #if RECURSIVE_MARSHAL_READ_TRACE
966 _dbus_verbose (" type reader %p read basic type_pos = %d value_pos = %d remaining sig '%s'\n",
967 reader, reader->type_pos, reader->value_pos,
968 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0));
973 * Reads a block of fixed-length basic values, from the current point
974 * in an array to the end of the array. Does not work for arrays of
975 * string or container types.
977 * This function returns the array in-place; it does not make a copy,
978 * and it does not swap the bytes.
980 * If you ask for #DBUS_TYPE_DOUBLE you will get a "const double*" back
981 * and the "value" argument should be a "const double**" and so on.
983 * @param reader the reader to read from
984 * @param value place to return the array values
985 * @param n_elements place to return number of array elements
988 _dbus_type_reader_read_fixed_multi (const DBusTypeReader *reader,
998 _dbus_assert (!reader->klass->types_only);
999 _dbus_assert (reader->klass == &array_reader_class);
1001 element_type = _dbus_first_type_in_signature (reader->type_str,
1004 _dbus_assert (element_type != DBUS_TYPE_INVALID); /* why we don't use get_current_type() */
1005 _dbus_assert (_dbus_type_is_fixed (element_type));
1007 alignment = _dbus_type_get_alignment (element_type);
1009 _dbus_assert (reader->value_pos >= reader->u.array.start_pos);
1011 total_len = array_reader_get_array_len (reader);
1012 end_pos = reader->u.array.start_pos + total_len;
1013 remaining_len = end_pos - reader->value_pos;
1015 #if RECURSIVE_MARSHAL_READ_TRACE
1016 _dbus_verbose ("end_pos %d total_len %d remaining_len %d value_pos %d\n",
1017 end_pos, total_len, remaining_len, reader->value_pos);
1020 _dbus_assert (remaining_len <= total_len);
1022 if (remaining_len == 0)
1023 *(const DBusBasicValue**) value = NULL;
1025 *(const DBusBasicValue**) value =
1026 (void*) _dbus_string_get_const_data_len (reader->value_str,
1030 *n_elements = remaining_len / alignment;
1031 _dbus_assert ((remaining_len % alignment) == 0);
1033 #if RECURSIVE_MARSHAL_READ_TRACE
1034 _dbus_verbose (" type reader %p read fixed array type_pos = %d value_pos = %d remaining sig '%s'\n",
1035 reader, reader->type_pos, reader->value_pos,
1036 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0));
1041 * Initialize a new reader pointing to the first type and
1042 * corresponding value that's a child of the current container. It's
1043 * an error to call this if the current type is a non-container.
1045 * Note that DBusTypeReader traverses values, not types. So if you
1046 * have an empty array of array of int, you can't recurse into it. You
1047 * can only recurse into each element.
1049 * @param reader the reader
1050 * @param sub a reader to init pointing to the first child
1053 _dbus_type_reader_recurse (DBusTypeReader *reader,
1054 DBusTypeReader *sub)
1058 t = _dbus_first_type_in_signature (reader->type_str, reader->type_pos);
1062 case DBUS_TYPE_STRUCT:
1063 if (reader->klass->types_only)
1064 sub->klass = &struct_types_only_reader_class;
1066 sub->klass = &struct_reader_class;
1068 case DBUS_TYPE_DICT_ENTRY:
1069 if (reader->klass->types_only)
1070 sub->klass = &dict_entry_types_only_reader_class;
1072 sub->klass = &dict_entry_reader_class;
1074 case DBUS_TYPE_ARRAY:
1075 if (reader->klass->types_only)
1076 sub->klass = &array_types_only_reader_class;
1078 sub->klass = &array_reader_class;
1080 case DBUS_TYPE_VARIANT:
1081 if (reader->klass->types_only)
1082 _dbus_assert_not_reached ("can't recurse into variant typecode");
1084 sub->klass = &variant_reader_class;
1087 _dbus_verbose ("recursing into type %s\n", _dbus_type_to_string (t));
1088 #ifndef DBUS_DISABLE_CHECKS
1089 if (t == DBUS_TYPE_INVALID)
1090 _dbus_warn ("You can't recurse into an empty array or off the end of a message body\n");
1091 #endif /* DBUS_DISABLE_CHECKS */
1093 _dbus_assert_not_reached ("don't yet handle recursing into this type");
1096 _dbus_assert (sub->klass == all_reader_classes[sub->klass->id]);
1098 (* sub->klass->recurse) (sub, reader);
1100 #if RECURSIVE_MARSHAL_READ_TRACE
1101 _dbus_verbose (" type reader %p RECURSED type_pos = %d value_pos = %d remaining sig '%s'\n",
1102 sub, sub->type_pos, sub->value_pos,
1103 _dbus_string_get_const_data_len (sub->type_str, sub->type_pos, 0));
1108 * Skip to the next value on this "level". e.g. the next field in a
1109 * struct, the next value in an array. Returns FALSE at the end of the
1110 * current container.
1112 * @param reader the reader
1113 * @returns FALSE if nothing more to read at or below this level
1116 _dbus_type_reader_next (DBusTypeReader *reader)
1120 t = _dbus_type_reader_get_current_type (reader);
1122 #if RECURSIVE_MARSHAL_READ_TRACE
1123 _dbus_verbose (" type reader %p START next() { type_pos = %d value_pos = %d remaining sig '%s' current_type = %s\n",
1124 reader, reader->type_pos, reader->value_pos,
1125 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0),
1126 _dbus_type_to_string (t));
1129 if (t == DBUS_TYPE_INVALID)
1132 (* reader->klass->next) (reader, t);
1134 #if RECURSIVE_MARSHAL_READ_TRACE
1135 _dbus_verbose (" type reader %p END next() type_pos = %d value_pos = %d remaining sig '%s' current_type = %s\n",
1136 reader, reader->type_pos, reader->value_pos,
1137 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0),
1138 _dbus_type_to_string (_dbus_type_reader_get_current_type (reader)));
1141 return _dbus_type_reader_get_current_type (reader) != DBUS_TYPE_INVALID;
1145 * Check whether there's another value on this "level". e.g. the next
1146 * field in a struct, the next value in an array. Returns FALSE at the
1147 * end of the current container.
1149 * You probably don't want to use this; it makes for an awkward for/while
1150 * loop. A nicer one is "while ((current_type = get_current_type()) != INVALID)"
1152 * @param reader the reader
1153 * @returns FALSE if nothing more to read at or below this level
1156 _dbus_type_reader_has_next (const DBusTypeReader *reader)
1158 /* Not efficient but works for now. */
1159 DBusTypeReader copy;
1162 return _dbus_type_reader_next (©);
1166 * Gets the string and range of said string containing the signature
1167 * of the current value. Essentially a more complete version of
1168 * _dbus_type_reader_get_current_type() (returns the full type
1169 * rather than only the outside of the onion).
1171 * Note though that the first byte in a struct signature is
1172 * #DBUS_STRUCT_BEGIN_CHAR while the current type will be
1173 * #DBUS_TYPE_STRUCT so it isn't true that the first byte of the
1174 * signature is always the same as the current type. Another
1175 * difference is that this function will still return a signature when
1176 * inside an empty array; say you recurse into empty array of int32,
1177 * the signature is "i" but the current type will always be
1178 * #DBUS_TYPE_INVALID since there are no elements to be currently
1181 * @param reader the reader
1182 * @param str_p place to return the string with the type in it
1183 * @param start_p place to return start of the type
1184 * @param len_p place to return the length of the type
1187 _dbus_type_reader_get_signature (const DBusTypeReader *reader,
1188 const DBusString **str_p,
1192 *str_p = reader->type_str;
1193 *start_p = reader->type_pos;
1194 *len_p = find_len_of_complete_type (reader->type_str, reader->type_pos);
1199 DBusString replacement;
1204 replacement_block_init (ReplacementBlock *block,
1205 DBusTypeReader *reader)
1207 if (!_dbus_string_init (&block->replacement))
1210 /* % 8 is the padding to have the same align properties in
1211 * our replacement string as we do at the position being replaced
1213 block->padding = reader->value_pos % 8;
1215 if (!_dbus_string_lengthen (&block->replacement, block->padding))
1221 _dbus_string_free (&block->replacement);
1226 replacement_block_replace (ReplacementBlock *block,
1227 DBusTypeReader *reader,
1228 const DBusTypeReader *realign_root)
1230 DBusTypeWriter writer;
1231 DBusTypeReader realign_reader;
1235 _dbus_assert (realign_root != NULL);
1237 orig_len = _dbus_string_get_length (&block->replacement);
1239 realign_reader = *realign_root;
1241 #if RECURSIVE_MARSHAL_WRITE_TRACE
1242 _dbus_verbose ("INITIALIZING replacement block writer %p at value_pos %d\n",
1243 &writer, _dbus_string_get_length (&block->replacement));
1245 _dbus_type_writer_init_values_only (&writer,
1246 realign_reader.byte_order,
1247 realign_reader.type_str,
1248 realign_reader.type_pos,
1249 &block->replacement,
1250 _dbus_string_get_length (&block->replacement));
1252 _dbus_assert (realign_reader.value_pos <= reader->value_pos);
1254 #if RECURSIVE_MARSHAL_WRITE_TRACE
1255 _dbus_verbose ("COPYING from reader at value_pos %d to writer %p starting after value_pos %d\n",
1256 realign_reader.value_pos, &writer, reader->value_pos);
1259 if (!_dbus_type_writer_write_reader_partial (&writer,
1263 _dbus_string_get_length (&block->replacement) - block->padding,
1267 #if RECURSIVE_MARSHAL_WRITE_TRACE
1268 _dbus_verbose ("REPLACEMENT at padding %d len %d\n", block->padding,
1269 _dbus_string_get_length (&block->replacement) - block->padding);
1270 _dbus_verbose_bytes_of_string (&block->replacement, block->padding,
1271 _dbus_string_get_length (&block->replacement) - block->padding);
1272 _dbus_verbose ("TO BE REPLACED at value_pos = %d (align pad %d) len %d realign_reader.value_pos %d\n",
1273 reader->value_pos, reader->value_pos % 8,
1274 realign_reader.value_pos - reader->value_pos,
1275 realign_reader.value_pos);
1276 _dbus_verbose_bytes_of_string (reader->value_str,
1278 realign_reader.value_pos - reader->value_pos);
1281 /* Move the replacement into position
1282 * (realign_reader should now be at the end of the block to be replaced)
1284 if (!_dbus_string_replace_len (&block->replacement, block->padding,
1285 _dbus_string_get_length (&block->replacement) - block->padding,
1286 (DBusString*) reader->value_str,
1288 realign_reader.value_pos - reader->value_pos))
1291 /* Process our fixups now that we can't have an OOM error */
1292 apply_and_free_fixups (&fixups, reader);
1297 _dbus_string_set_length (&block->replacement, orig_len);
1298 free_fixups (&fixups);
1303 replacement_block_free (ReplacementBlock *block)
1305 _dbus_string_free (&block->replacement);
1308 /* In the variable-length case, we have to fix alignment after we insert.
1309 * The strategy is as follows:
1311 * - pad a new string to have the same alignment as the
1312 * start of the current basic value
1313 * - write the new basic value
1314 * - copy from the original reader to the new string,
1315 * which will fix the alignment of types following
1317 * - this copy has to start at realign_root,
1318 * but not really write anything until it
1319 * passes the value being set
1320 * - as an optimization, we can stop copying
1321 * when the source and dest values are both
1322 * on an 8-boundary, since we know all following
1323 * padding and alignment will be identical
1324 * - copy the new string back to the original
1325 * string, replacing the relevant part of the
1327 * - now any arrays in the original string that
1328 * contained the replaced string may have the
1329 * wrong length; so we have to fix that
1332 reader_set_basic_variable_length (DBusTypeReader *reader,
1335 const DBusTypeReader *realign_root)
1338 ReplacementBlock block;
1339 DBusTypeWriter writer;
1341 _dbus_assert (realign_root != NULL);
1345 if (!replacement_block_init (&block, reader))
1348 /* Write the new basic value */
1349 #if RECURSIVE_MARSHAL_WRITE_TRACE
1350 _dbus_verbose ("INITIALIZING writer %p to write basic value at value_pos %d of replacement string\n",
1351 &writer, _dbus_string_get_length (&block.replacement));
1353 _dbus_type_writer_init_values_only (&writer,
1358 _dbus_string_get_length (&block.replacement));
1359 #if RECURSIVE_MARSHAL_WRITE_TRACE
1360 _dbus_verbose ("WRITING basic value to writer %p (replacement string)\n", &writer);
1362 if (!_dbus_type_writer_write_basic (&writer, current_type, value))
1365 if (!replacement_block_replace (&block,
1373 replacement_block_free (&block);
1378 reader_set_basic_fixed_length (DBusTypeReader *reader,
1382 _dbus_marshal_set_basic ((DBusString*) reader->value_str,
1391 * Sets a new value for the basic type value pointed to by the reader,
1392 * leaving the reader valid to continue reading. Any other readers
1393 * will be invalidated if you set a variable-length type such as a
1396 * The provided realign_root is the reader to start from when
1397 * realigning the data that follows the newly-set value. The reader
1398 * parameter must point to a value below the realign_root parameter.
1399 * If the type being set is fixed-length, then realign_root may be
1400 * #NULL. Only values reachable from realign_root will be realigned,
1401 * so if your string contains other values you will need to deal with
1402 * those somehow yourself. It is OK if realign_root is the same
1403 * reader as the reader parameter, though if you aren't setting the
1404 * root it may not be such a good idea.
1406 * @todo DBusTypeReader currently takes "const" versions of the type
1407 * and value strings, and this function modifies those strings by
1408 * casting away the const, which is of course bad if we want to get
1409 * picky. (To be truly clean you'd have an object which contained the
1410 * type and value strings and set_basic would be a method on that
1411 * object... this would also make DBusTypeReader the same thing as
1412 * DBusTypeMark. But since DBusMessage is effectively that object for
1413 * D-BUS it doesn't seem worth creating some random object.)
1415 * @todo optimize this by only rewriting until the old and new values
1416 * are at the same alignment. Frequently this should result in only
1417 * replacing the value that's immediately at hand.
1419 * @param reader reader indicating where to set a new value
1420 * @param value address of the value to set
1421 * @param realign_root realign from here
1422 * @returns #FALSE if not enough memory
1425 _dbus_type_reader_set_basic (DBusTypeReader *reader,
1427 const DBusTypeReader *realign_root)
1431 _dbus_assert (!reader->klass->types_only);
1432 _dbus_assert (reader->value_str == realign_root->value_str);
1433 _dbus_assert (reader->value_pos >= realign_root->value_pos);
1435 current_type = _dbus_type_reader_get_current_type (reader);
1437 #if RECURSIVE_MARSHAL_WRITE_TRACE
1438 _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",
1439 reader, reader->type_pos, reader->value_pos,
1440 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0),
1442 realign_root ? realign_root->value_pos : -1,
1443 _dbus_type_to_string (current_type));
1444 _dbus_verbose_bytes_of_string (realign_root->value_str, realign_root->value_pos,
1445 _dbus_string_get_length (realign_root->value_str) -
1446 realign_root->value_pos);
1449 _dbus_assert (_dbus_type_is_basic (current_type));
1451 if (_dbus_type_is_fixed (current_type))
1453 reader_set_basic_fixed_length (reader, current_type, value);
1458 _dbus_assert (realign_root != NULL);
1459 return reader_set_basic_variable_length (reader, current_type,
1460 value, realign_root);
1465 * Recursively deletes any value pointed to by the reader, leaving the
1466 * reader valid to continue reading. Any other readers will be
1469 * The provided realign_root is the reader to start from when
1470 * realigning the data that follows the newly-set value.
1471 * See _dbus_type_reader_set_basic() for more details on the
1472 * realign_root paramter.
1474 * @todo for now this does not delete the typecodes associated with
1475 * the value, so this function should only be used for array elements.
1477 * @param reader reader indicating where to delete a value
1478 * @param realign_root realign from here
1479 * @returns #FALSE if not enough memory
1482 _dbus_type_reader_delete (DBusTypeReader *reader,
1483 const DBusTypeReader *realign_root)
1486 ReplacementBlock block;
1488 _dbus_assert (realign_root != NULL);
1489 _dbus_assert (reader->klass == &array_reader_class);
1493 if (!replacement_block_init (&block, reader))
1496 if (!replacement_block_replace (&block,
1504 replacement_block_free (&block);
1509 * Compares two readers, which must be iterating over the same value data.
1510 * Returns #TRUE if the first parameter is further along than the second parameter.
1512 * @param lhs left-hand-side (first) parameter
1513 * @param rhs left-hand-side (first) parameter
1514 * @returns whether lhs is greater than rhs
1517 _dbus_type_reader_greater_than (const DBusTypeReader *lhs,
1518 const DBusTypeReader *rhs)
1520 _dbus_assert (lhs->value_str == rhs->value_str);
1522 return lhs->value_pos > rhs->value_pos;
1535 * Initialize a write iterator, which is used to write out values in
1536 * serialized D-BUS format.
1538 * The type_pos passed in is expected to be inside an already-valid,
1539 * though potentially empty, type signature. This means that the byte
1540 * after type_pos must be either #DBUS_TYPE_INVALID (aka nul) or some
1541 * other valid type. #DBusTypeWriter won't enforce that the signature
1542 * is already valid (you can append the nul byte at the end if you
1543 * like), but just be aware that you need the nul byte eventually and
1544 * #DBusTypeWriter isn't going to write it for you.
1546 * @param writer the writer to init
1547 * @param byte_order the byte order to marshal into
1548 * @param type_str the string to write typecodes into
1549 * @param type_pos where to insert typecodes
1550 * @param value_str the string to write values into
1551 * @param value_pos where to insert values
1555 _dbus_type_writer_init (DBusTypeWriter *writer,
1557 DBusString *type_str,
1559 DBusString *value_str,
1562 writer->byte_order = byte_order;
1563 writer->type_str = type_str;
1564 writer->type_pos = type_pos;
1565 writer->value_str = value_str;
1566 writer->value_pos = value_pos;
1567 writer->container_type = DBUS_TYPE_INVALID;
1568 writer->type_pos_is_expectation = FALSE;
1569 writer->enabled = TRUE;
1571 #if RECURSIVE_MARSHAL_WRITE_TRACE
1572 _dbus_verbose ("writer %p init remaining sig '%s'\n", writer,
1574 _dbus_string_get_const_data_len (writer->type_str, writer->type_pos, 0) :
1580 * Initialize a write iterator, with the signature to be provided
1583 * @param writer the writer to init
1584 * @param byte_order the byte order to marshal into
1585 * @param value_str the string to write values into
1586 * @param value_pos where to insert values
1590 _dbus_type_writer_init_types_delayed (DBusTypeWriter *writer,
1592 DBusString *value_str,
1595 _dbus_type_writer_init (writer, byte_order,
1596 NULL, 0, value_str, value_pos);
1600 * Adds type string to the writer, if it had none.
1602 * @param writer the writer to init
1603 * @param type_str type string to add
1604 * @param type_pos type position
1608 _dbus_type_writer_add_types (DBusTypeWriter *writer,
1609 DBusString *type_str,
1612 if (writer->type_str == NULL) /* keeps us from using this as setter */
1614 writer->type_str = type_str;
1615 writer->type_pos = type_pos;
1620 * Removes type string from the writer.
1622 * @param writer the writer to remove from
1625 _dbus_type_writer_remove_types (DBusTypeWriter *writer)
1627 writer->type_str = NULL;
1628 writer->type_pos = -1;
1632 * Like _dbus_type_writer_init(), except the type string
1633 * passed in should correspond to an existing signature that
1634 * matches what you're going to write out. The writer will
1635 * check what you write vs. this existing signature.
1637 * @param writer the writer to init
1638 * @param byte_order the byte order to marshal into
1639 * @param type_str the string with signature
1640 * @param type_pos start of signature
1641 * @param value_str the string to write values into
1642 * @param value_pos where to insert values
1646 _dbus_type_writer_init_values_only (DBusTypeWriter *writer,
1648 const DBusString *type_str,
1650 DBusString *value_str,
1653 _dbus_type_writer_init (writer, byte_order,
1654 (DBusString*)type_str, type_pos,
1655 value_str, value_pos);
1657 writer->type_pos_is_expectation = TRUE;
1661 _dbus_type_writer_write_basic_no_typecode (DBusTypeWriter *writer,
1665 if (writer->enabled)
1666 return _dbus_marshal_write_basic (writer->value_str,
1671 &writer->value_pos);
1676 /* If our parent is an array, things are a little bit complicated.
1678 * The parent must have a complete element type, such as
1679 * "i" or "aai" or "(ii)" or "a(ii)". There can't be
1680 * unclosed parens, or an "a" with no following type.
1682 * To recurse, the only allowed operation is to recurse into the
1683 * first type in the element type. So for "i" you can't recurse, for
1684 * "ai" you can recurse into the array, for "(ii)" you can recurse
1687 * If you recurse into the array for "ai", then you must specify
1688 * "i" for the element type of the array you recurse into.
1690 * While inside an array at any level, we need to avoid writing to
1691 * type_str, since the type only appears once for the whole array,
1692 * it does not appear for each array element.
1694 * While inside an array type_pos points to the expected next
1695 * typecode, rather than the next place we could write a typecode.
1698 writer_recurse_init_and_check (DBusTypeWriter *writer,
1700 DBusTypeWriter *sub)
1702 _dbus_type_writer_init (sub,
1709 sub->container_type = container_type;
1711 if (writer->type_pos_is_expectation ||
1712 (sub->container_type == DBUS_TYPE_ARRAY || sub->container_type == DBUS_TYPE_VARIANT))
1713 sub->type_pos_is_expectation = TRUE;
1715 sub->type_pos_is_expectation = FALSE;
1717 sub->enabled = writer->enabled;
1719 #ifndef DBUS_DISABLE_CHECKS
1720 if (writer->type_pos_is_expectation && writer->type_str)
1724 expected = _dbus_first_type_in_signature (writer->type_str, writer->type_pos);
1726 if (expected != sub->container_type)
1728 _dbus_warn ("Writing an element of type %s, but the expected type here is %s\n",
1729 _dbus_type_to_string (sub->container_type),
1730 _dbus_type_to_string (expected));
1731 _dbus_assert_not_reached ("bad array element or variant content written");
1734 #endif /* DBUS_DISABLE_CHECKS */
1736 #if RECURSIVE_MARSHAL_WRITE_TRACE
1737 _dbus_verbose (" type writer %p recurse parent %s type_pos = %d value_pos = %d is_expectation = %d remaining sig '%s' enabled = %d\n",
1739 _dbus_type_to_string (writer->container_type),
1740 writer->type_pos, writer->value_pos, writer->type_pos_is_expectation,
1742 _dbus_string_get_const_data_len (writer->type_str, writer->type_pos, 0) :
1745 _dbus_verbose (" type writer %p recurse sub %s type_pos = %d value_pos = %d is_expectation = %d enabled = %d\n",
1747 _dbus_type_to_string (sub->container_type),
1748 sub->type_pos, sub->value_pos,
1749 sub->type_pos_is_expectation,
1755 write_or_verify_typecode (DBusTypeWriter *writer,
1758 /* A subwriter inside an array or variant will have type_pos
1759 * pointing to the expected typecode; a writer not inside an array
1760 * or variant has type_pos pointing to the next place to insert a
1763 #if RECURSIVE_MARSHAL_WRITE_TRACE
1764 _dbus_verbose (" type writer %p write_or_verify start type_pos = %d remaining sig '%s' enabled = %d\n",
1765 writer, writer->type_pos,
1767 _dbus_string_get_const_data_len (writer->type_str, writer->type_pos, 0) :
1772 if (writer->type_str == NULL)
1775 if (writer->type_pos_is_expectation)
1777 #ifndef DBUS_DISABLE_CHECKS
1781 expected = _dbus_string_get_byte (writer->type_str, writer->type_pos);
1783 if (expected != typecode)
1785 _dbus_warn ("Array or variant type requires that type %s be written, but %s was written\n",
1786 _dbus_type_to_string (expected), _dbus_type_to_string (typecode));
1787 _dbus_assert_not_reached ("bad type inserted somewhere inside an array or variant");
1790 #endif /* DBUS_DISABLE_CHECKS */
1792 /* if immediately inside an array we'd always be appending an element,
1793 * so the expected type doesn't change; if inside a struct or something
1794 * below an array, we need to move through said struct or something.
1796 if (writer->container_type != DBUS_TYPE_ARRAY)
1797 writer->type_pos += 1;
1801 if (!_dbus_string_insert_byte (writer->type_str,
1806 writer->type_pos += 1;
1809 #if RECURSIVE_MARSHAL_WRITE_TRACE
1810 _dbus_verbose (" type writer %p write_or_verify end type_pos = %d remaining sig '%s'\n",
1811 writer, writer->type_pos,
1812 _dbus_string_get_const_data_len (writer->type_str, writer->type_pos, 0));
1819 writer_recurse_struct_or_dict_entry (DBusTypeWriter *writer,
1821 const DBusString *contained_type,
1822 int contained_type_start,
1823 int contained_type_len,
1824 DBusTypeWriter *sub)
1826 /* FIXME right now contained_type is ignored; we could probably
1827 * almost trivially fix the code so if it's present we
1828 * write it out and then set type_pos_is_expectation
1831 /* Ensure that we'll be able to add alignment padding and the typecode */
1832 if (writer->enabled)
1834 if (!_dbus_string_alloc_space (sub->value_str, 8))
1838 if (!write_or_verify_typecode (sub, begin_char))
1839 _dbus_assert_not_reached ("failed to insert struct typecode after prealloc");
1841 if (writer->enabled)
1843 if (!_dbus_string_insert_bytes (sub->value_str,
1845 _DBUS_ALIGN_VALUE (sub->value_pos, 8) - sub->value_pos,
1847 _dbus_assert_not_reached ("should not have failed to insert alignment padding for struct");
1848 sub->value_pos = _DBUS_ALIGN_VALUE (sub->value_pos, 8);
1856 writer_recurse_array (DBusTypeWriter *writer,
1857 const DBusString *contained_type,
1858 int contained_type_start,
1859 int contained_type_len,
1860 DBusTypeWriter *sub,
1861 dbus_bool_t is_array_append)
1863 dbus_uint32_t value = 0;
1867 #ifndef DBUS_DISABLE_CHECKS
1868 if (writer->container_type == DBUS_TYPE_ARRAY &&
1871 if (!_dbus_string_equal_substring (contained_type,
1872 contained_type_start,
1875 writer->u.array.element_type_pos + 1))
1877 _dbus_warn ("Writing an array of '%s' but this is incompatible with the expected type of elements in the parent array\n",
1878 _dbus_string_get_const_data_len (contained_type,
1879 contained_type_start,
1880 contained_type_len));
1881 _dbus_assert_not_reached ("incompatible type for child array");
1884 #endif /* DBUS_DISABLE_CHECKS */
1886 if (writer->enabled && !is_array_append)
1888 /* 3 pad + 4 bytes for the array length, and 4 bytes possible padding
1889 * before array values
1891 if (!_dbus_string_alloc_space (sub->value_str, 3 + 4 + 4))
1895 if (writer->type_str != NULL)
1897 sub->type_pos += 1; /* move to point to the element type, since type_pos
1898 * should be the expected type for further writes
1900 sub->u.array.element_type_pos = sub->type_pos;
1903 if (!writer->type_pos_is_expectation)
1905 /* sub is a toplevel/outermost array so we need to write the type data */
1907 /* alloc space for array typecode, element signature */
1908 if (!_dbus_string_alloc_space (writer->type_str, 1 + contained_type_len))
1911 if (!_dbus_string_insert_byte (writer->type_str,
1914 _dbus_assert_not_reached ("failed to insert array typecode after prealloc");
1916 if (!_dbus_string_copy_len (contained_type,
1917 contained_type_start, contained_type_len,
1919 sub->u.array.element_type_pos))
1920 _dbus_assert_not_reached ("should not have failed to insert array element typecodes");
1923 if (writer->type_str != NULL)
1925 /* If the parent is an array, we hold type_pos pointing at the array element type;
1926 * otherwise advance it to reflect the array value we just recursed into
1928 if (writer->container_type != DBUS_TYPE_ARRAY)
1929 writer->type_pos += 1 + contained_type_len;
1931 _dbus_assert (writer->type_pos_is_expectation); /* because it's an array */
1934 if (writer->enabled)
1936 /* Write (or jump over, if is_array_append) the length */
1937 sub->u.array.len_pos = _DBUS_ALIGN_VALUE (sub->value_pos, 4);
1939 if (is_array_append)
1941 sub->value_pos += 4;
1945 if (!_dbus_type_writer_write_basic_no_typecode (sub, DBUS_TYPE_UINT32,
1947 _dbus_assert_not_reached ("should not have failed to insert array len");
1950 _dbus_assert (sub->u.array.len_pos == sub->value_pos - 4);
1952 /* Write alignment padding for array elements
1953 * Note that we write the padding *even for empty arrays*
1954 * to avoid wonky special cases
1956 alignment = element_type_get_alignment (contained_type, contained_type_start);
1958 aligned = _DBUS_ALIGN_VALUE (sub->value_pos, alignment);
1959 if (aligned != sub->value_pos)
1961 if (!is_array_append)
1963 if (!_dbus_string_insert_bytes (sub->value_str,
1965 aligned - sub->value_pos,
1967 _dbus_assert_not_reached ("should not have failed to insert alignment padding");
1970 sub->value_pos = aligned;
1973 sub->u.array.start_pos = sub->value_pos;
1975 if (is_array_append)
1979 _dbus_assert (_DBUS_ALIGN_VALUE (sub->u.array.len_pos, 4) ==
1980 (unsigned) sub->u.array.len_pos);
1981 len = _dbus_unpack_uint32 (sub->byte_order,
1982 _dbus_string_get_const_data_len (sub->value_str,
1983 sub->u.array.len_pos,
1986 sub->value_pos += len;
1991 /* not enabled, so we won't write the len_pos; set it to -1 to so indicate */
1992 sub->u.array.len_pos = -1;
1993 sub->u.array.start_pos = sub->value_pos;
1996 _dbus_assert (sub->u.array.len_pos < sub->u.array.start_pos);
1997 _dbus_assert (is_array_append || sub->u.array.start_pos == sub->value_pos);
1999 #if RECURSIVE_MARSHAL_WRITE_TRACE
2000 _dbus_verbose (" type writer %p recurse array done remaining sig '%s' array start_pos = %d len_pos = %d value_pos = %d\n", sub,
2002 _dbus_string_get_const_data_len (sub->type_str, sub->type_pos, 0) :
2004 sub->u.array.start_pos, sub->u.array.len_pos, sub->value_pos);
2010 /* Variant value will normally have:
2011 * 1 byte signature length not including nul
2012 * signature typecodes (nul terminated)
2013 * padding to alignment of contained type
2014 * body according to signature
2016 * The signature string can only have a single type
2017 * in it but that type may be complex/recursive.
2019 * So a typical variant type with the integer 3 will have these
2021 * 0x1 'i' '\0' [1 byte padding to alignment boundary] 0x0 0x0 0x0 0x3
2023 * The main world of hurt for writing out a variant is that the type
2024 * string is the same string as the value string. Which means
2025 * inserting to the type string will move the value_pos; and it means
2026 * that inserting to the type string could break type alignment.
2029 writer_recurse_variant (DBusTypeWriter *writer,
2030 const DBusString *contained_type,
2031 int contained_type_start,
2032 int contained_type_len,
2033 DBusTypeWriter *sub)
2035 int contained_alignment;
2037 if (writer->enabled)
2039 /* Allocate space for the worst case, which is 1 byte sig
2040 * length, nul byte at end of sig, and 7 bytes padding to
2043 if (!_dbus_string_alloc_space (sub->value_str, contained_type_len + 9))
2047 /* write VARIANT typecode to the parent's type string */
2048 if (!write_or_verify_typecode (writer, DBUS_TYPE_VARIANT))
2051 /* If not enabled, mark that we have no type_str anymore ... */
2053 if (!writer->enabled)
2055 sub->type_str = NULL;
2061 /* If we're enabled then continue ... */
2063 if (!_dbus_string_insert_byte (sub->value_str,
2065 contained_type_len))
2066 _dbus_assert_not_reached ("should not have failed to insert variant type sig len");
2068 sub->value_pos += 1;
2070 /* Here we switch over to the expected type sig we're about to write */
2071 sub->type_str = sub->value_str;
2072 sub->type_pos = sub->value_pos;
2074 if (!_dbus_string_copy_len (contained_type, contained_type_start, contained_type_len,
2075 sub->value_str, sub->value_pos))
2076 _dbus_assert_not_reached ("should not have failed to insert variant type sig");
2078 sub->value_pos += contained_type_len;
2080 if (!_dbus_string_insert_byte (sub->value_str,
2083 _dbus_assert_not_reached ("should not have failed to insert variant type nul termination");
2085 sub->value_pos += 1;
2087 contained_alignment = _dbus_type_get_alignment (_dbus_first_type_in_signature (contained_type, contained_type_start));
2089 if (!_dbus_string_insert_bytes (sub->value_str,
2091 _DBUS_ALIGN_VALUE (sub->value_pos, contained_alignment) - sub->value_pos,
2093 _dbus_assert_not_reached ("should not have failed to insert alignment padding for variant body");
2094 sub->value_pos = _DBUS_ALIGN_VALUE (sub->value_pos, contained_alignment);
2100 _dbus_type_writer_recurse_contained_len (DBusTypeWriter *writer,
2102 const DBusString *contained_type,
2103 int contained_type_start,
2104 int contained_type_len,
2105 DBusTypeWriter *sub,
2106 dbus_bool_t is_array_append)
2108 writer_recurse_init_and_check (writer, container_type, sub);
2110 switch (container_type)
2112 case DBUS_TYPE_STRUCT:
2113 return writer_recurse_struct_or_dict_entry (writer,
2114 DBUS_STRUCT_BEGIN_CHAR,
2116 contained_type_start, contained_type_len,
2119 case DBUS_TYPE_DICT_ENTRY:
2120 return writer_recurse_struct_or_dict_entry (writer,
2121 DBUS_DICT_ENTRY_BEGIN_CHAR,
2123 contained_type_start, contained_type_len,
2126 case DBUS_TYPE_ARRAY:
2127 return writer_recurse_array (writer,
2128 contained_type, contained_type_start, contained_type_len,
2129 sub, is_array_append);
2131 case DBUS_TYPE_VARIANT:
2132 return writer_recurse_variant (writer,
2133 contained_type, contained_type_start, contained_type_len,
2137 _dbus_assert_not_reached ("tried to recurse into type that doesn't support that");
2144 * Opens a new container and writes out the initial information for that container.
2146 * @param writer the writer
2147 * @param container_type the type of the container to open
2148 * @param contained_type the array element type or variant content type
2149 * @param contained_type_start position to look for the type
2150 * @param sub the new sub-writer to write container contents
2151 * @returns #FALSE if no memory
2154 _dbus_type_writer_recurse (DBusTypeWriter *writer,
2156 const DBusString *contained_type,
2157 int contained_type_start,
2158 DBusTypeWriter *sub)
2160 int contained_type_len;
2163 contained_type_len = find_len_of_complete_type (contained_type, contained_type_start);
2165 contained_type_len = 0;
2167 return _dbus_type_writer_recurse_contained_len (writer, container_type,
2169 contained_type_start,
2176 * Append to an existing array. Essentially, the writer will read an
2177 * existing length at the write location; jump over that length; and
2178 * write new fields. On unrecurse(), the existing length will be
2181 * @param writer the writer
2182 * @param contained_type element type
2183 * @param contained_type_start position of element type
2184 * @param sub the subwriter to init
2185 * @returns #FALSE if no memory
2188 _dbus_type_writer_append_array (DBusTypeWriter *writer,
2189 const DBusString *contained_type,
2190 int contained_type_start,
2191 DBusTypeWriter *sub)
2193 int contained_type_len;
2196 contained_type_len = find_len_of_complete_type (contained_type, contained_type_start);
2198 contained_type_len = 0;
2200 return _dbus_type_writer_recurse_contained_len (writer, DBUS_TYPE_ARRAY,
2202 contained_type_start,
2209 writer_get_array_len (DBusTypeWriter *writer)
2211 _dbus_assert (writer->container_type == DBUS_TYPE_ARRAY);
2212 return writer->value_pos - writer->u.array.start_pos;
2216 * Closes a container created by _dbus_type_writer_recurse()
2217 * and writes any additional information to the values block.
2219 * @param writer the writer
2220 * @param sub the sub-writer created by _dbus_type_writer_recurse()
2221 * @returns #FALSE if no memory
2224 _dbus_type_writer_unrecurse (DBusTypeWriter *writer,
2225 DBusTypeWriter *sub)
2227 /* type_pos_is_expectation never gets unset once set, or we'd get all hosed */
2228 _dbus_assert (!writer->type_pos_is_expectation ||
2229 (writer->type_pos_is_expectation && sub->type_pos_is_expectation));
2231 #if RECURSIVE_MARSHAL_WRITE_TRACE
2232 _dbus_verbose (" type writer %p unrecurse type_pos = %d value_pos = %d is_expectation = %d container_type = %s\n",
2233 writer, writer->type_pos, writer->value_pos, writer->type_pos_is_expectation,
2234 _dbus_type_to_string (writer->container_type));
2235 _dbus_verbose (" type writer %p unrecurse sub type_pos = %d value_pos = %d is_expectation = %d container_type = %s\n",
2236 sub, sub->type_pos, sub->value_pos,
2237 sub->type_pos_is_expectation,
2238 _dbus_type_to_string (sub->container_type));
2241 if (sub->container_type == DBUS_TYPE_STRUCT)
2243 if (!write_or_verify_typecode (sub, DBUS_STRUCT_END_CHAR))
2246 else if (sub->container_type == DBUS_TYPE_DICT_ENTRY)
2248 if (!write_or_verify_typecode (sub, DBUS_DICT_ENTRY_END_CHAR))
2251 else if (sub->container_type == DBUS_TYPE_ARRAY)
2253 if (sub->u.array.len_pos >= 0) /* len_pos == -1 if we weren't enabled when we passed it */
2257 /* Set the array length */
2258 len = writer_get_array_len (sub);
2259 _dbus_marshal_set_uint32 (sub->value_str,
2260 sub->u.array.len_pos,
2263 #if RECURSIVE_MARSHAL_WRITE_TRACE
2264 _dbus_verbose (" filled in sub array len to %u at len_pos %d\n",
2265 len, sub->u.array.len_pos);
2268 #if RECURSIVE_MARSHAL_WRITE_TRACE
2271 _dbus_verbose (" not filling in sub array len because we were disabled when we passed the len\n");
2276 /* Now get type_pos right for the parent writer. Here are the cases:
2278 * Cases !writer->type_pos_is_expectation:
2279 * (in these cases we want to update to the new insertion point)
2281 * - if we recursed into a STRUCT then we didn't know in advance
2282 * what the types in the struct would be; so we have to fill in
2283 * that information now.
2284 * writer->type_pos = sub->type_pos
2286 * - if we recursed into anything else, we knew the full array
2287 * type, or knew the single typecode marking VARIANT, so
2288 * writer->type_pos is already correct.
2289 * writer->type_pos should remain as-is
2291 * - note that the parent is never an ARRAY or VARIANT, if it were
2292 * then type_pos_is_expectation would be TRUE. The parent
2293 * is thus known to be a toplevel or STRUCT.
2295 * Cases where writer->type_pos_is_expectation:
2296 * (in these cases we want to update to next expected type to write)
2298 * - we recursed from STRUCT into STRUCT and we didn't increment
2299 * type_pos in the parent just to stay consistent with the
2300 * !writer->type_pos_is_expectation case (though we could
2301 * special-case this in recurse_struct instead if we wanted)
2302 * writer->type_pos = sub->type_pos
2304 * - we recursed from STRUCT into ARRAY or VARIANT and type_pos
2305 * for parent should have been incremented already
2306 * writer->type_pos should remain as-is
2308 * - we recursed from ARRAY into a sub-element, so type_pos in the
2309 * parent is the element type and should remain the element type
2310 * for the benefit of the next child element
2311 * writer->type_pos should remain as-is
2313 * - we recursed from VARIANT into its value, so type_pos in the
2314 * parent makes no difference since there's only one value
2315 * and we just finished writing it and won't use type_pos again
2316 * writer->type_pos should remain as-is
2319 * For all these, DICT_ENTRY is the same as STRUCT
2321 if (writer->type_str != NULL)
2323 if ((sub->container_type == DBUS_TYPE_STRUCT ||
2324 sub->container_type == DBUS_TYPE_DICT_ENTRY) &&
2325 (writer->container_type == DBUS_TYPE_STRUCT ||
2326 writer->container_type == DBUS_TYPE_DICT_ENTRY ||
2327 writer->container_type == DBUS_TYPE_INVALID))
2329 /* Advance the parent to the next struct field */
2330 writer->type_pos = sub->type_pos;
2334 writer->value_pos = sub->value_pos;
2336 #if RECURSIVE_MARSHAL_WRITE_TRACE
2337 _dbus_verbose (" type writer %p unrecursed type_pos = %d value_pos = %d remaining sig '%s'\n",
2338 writer, writer->type_pos, writer->value_pos,
2340 _dbus_string_get_const_data_len (writer->type_str, writer->type_pos, 0) :
2348 * Writes out a basic type.
2350 * @param writer the writer
2351 * @param type the type to write
2352 * @param value the address of the value to write
2353 * @returns #FALSE if no memory
2356 _dbus_type_writer_write_basic (DBusTypeWriter *writer,
2362 /* First ensure that our type realloc will succeed */
2363 if (!writer->type_pos_is_expectation && writer->type_str != NULL)
2365 if (!_dbus_string_alloc_space (writer->type_str, 1))
2371 if (!_dbus_type_writer_write_basic_no_typecode (writer, type, value))
2374 if (!write_or_verify_typecode (writer, type))
2375 _dbus_assert_not_reached ("failed to write typecode after prealloc");
2380 #if RECURSIVE_MARSHAL_WRITE_TRACE
2381 _dbus_verbose (" type writer %p basic type_pos = %d value_pos = %d is_expectation = %d enabled = %d\n",
2382 writer, writer->type_pos, writer->value_pos, writer->type_pos_is_expectation,
2390 * Writes a block of fixed-length basic values, i.e. those that are
2391 * both _dbus_type_is_fixed() and _dbus_type_is_basic(). The block
2392 * must be written inside an array.
2394 * The value parameter should be the address of said array of values,
2395 * so e.g. if it's an array of double, pass in "const double**"
2397 * @param writer the writer
2398 * @param element_type type of stuff in the array
2399 * @param value address of the array
2400 * @param n_elements number of elements in the array
2401 * @returns #FALSE if no memory
2404 _dbus_type_writer_write_fixed_multi (DBusTypeWriter *writer,
2409 _dbus_assert (writer->container_type == DBUS_TYPE_ARRAY);
2410 _dbus_assert (_dbus_type_is_fixed (element_type));
2411 _dbus_assert (writer->type_pos_is_expectation);
2412 _dbus_assert (n_elements >= 0);
2414 #if RECURSIVE_MARSHAL_WRITE_TRACE
2415 _dbus_verbose (" type writer %p entering fixed multi type_pos = %d value_pos = %d n_elements %d\n",
2416 writer, writer->type_pos, writer->value_pos, n_elements);
2419 if (!write_or_verify_typecode (writer, element_type))
2420 _dbus_assert_not_reached ("OOM should not happen if only verifying typecode");
2422 if (writer->enabled)
2424 if (!_dbus_marshal_write_fixed_multi (writer->value_str,
2430 &writer->value_pos))
2434 #if RECURSIVE_MARSHAL_WRITE_TRACE
2435 _dbus_verbose (" type writer %p fixed multi written new type_pos = %d new value_pos = %d n_elements %d\n",
2436 writer, writer->type_pos, writer->value_pos, n_elements);
2443 enable_if_after (DBusTypeWriter *writer,
2444 DBusTypeReader *reader,
2445 const DBusTypeReader *start_after)
2449 if (!writer->enabled && _dbus_type_reader_greater_than (reader, start_after))
2451 _dbus_type_writer_set_enabled (writer, TRUE);
2452 #if RECURSIVE_MARSHAL_WRITE_TRACE
2453 _dbus_verbose ("ENABLING writer %p at %d because reader at value_pos %d is after reader at value_pos %d\n",
2454 writer, writer->value_pos, reader->value_pos, start_after->value_pos);
2458 _dbus_assert ((!writer->enabled && !_dbus_type_reader_greater_than (reader, start_after)) ||
2459 (writer->enabled && _dbus_type_reader_greater_than (reader, start_after)));
2464 append_fixup (DBusList **fixups,
2465 const DBusArrayLenFixup *fixup)
2467 DBusArrayLenFixup *f;
2469 f = dbus_new (DBusArrayLenFixup, 1);
2475 if (!_dbus_list_append (fixups, f))
2481 _dbus_assert (f->len_pos_in_reader == fixup->len_pos_in_reader);
2482 _dbus_assert (f->new_len == fixup->new_len);
2487 /* This loop is trivial if you ignore all the start_after nonsense,
2488 * so if you're trying to figure it out, start by ignoring that
2491 writer_write_reader_helper (DBusTypeWriter *writer,
2492 DBusTypeReader *reader,
2493 const DBusTypeReader *start_after,
2494 int start_after_new_pos,
2495 int start_after_new_len,
2497 dbus_bool_t inside_start_after)
2501 while ((current_type = _dbus_type_reader_get_current_type (reader)) != DBUS_TYPE_INVALID)
2503 if (_dbus_type_is_container (current_type))
2505 DBusTypeReader subreader;
2506 DBusTypeWriter subwriter;
2507 const DBusString *sig_str;
2510 dbus_bool_t enabled_at_recurse;
2511 dbus_bool_t past_start_after;
2512 int reader_array_len_pos;
2513 int reader_array_start_pos;
2514 dbus_bool_t this_is_start_after;
2516 /* type_pos is checked since e.g. in a struct the struct
2517 * and its first field have the same value_pos.
2518 * type_str will differ in reader/start_after for variants
2519 * where type_str is inside the value_str
2521 if (!inside_start_after && start_after &&
2522 reader->value_pos == start_after->value_pos &&
2523 reader->type_str == start_after->type_str &&
2524 reader->type_pos == start_after->type_pos)
2525 this_is_start_after = TRUE;
2527 this_is_start_after = FALSE;
2529 _dbus_type_reader_recurse (reader, &subreader);
2531 if (current_type == DBUS_TYPE_ARRAY)
2533 reader_array_len_pos = ARRAY_READER_LEN_POS (&subreader);
2534 reader_array_start_pos = subreader.u.array.start_pos;
2539 reader_array_len_pos = -1;
2540 reader_array_start_pos = -1;
2543 _dbus_type_reader_get_signature (&subreader, &sig_str,
2544 &sig_start, &sig_len);
2546 #if RECURSIVE_MARSHAL_WRITE_TRACE
2547 _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",
2548 _dbus_type_to_string (current_type),
2550 subreader.value_pos,
2552 start_after ? start_after->value_pos : -1,
2553 _dbus_string_get_length (writer->value_str),
2554 inside_start_after, this_is_start_after);
2557 if (!inside_start_after && !this_is_start_after)
2558 enable_if_after (writer, &subreader, start_after);
2559 enabled_at_recurse = writer->enabled;
2560 if (!_dbus_type_writer_recurse_contained_len (writer, current_type,
2561 sig_str, sig_start, sig_len,
2565 #if RECURSIVE_MARSHAL_WRITE_TRACE
2566 _dbus_verbose ("recursed into subwriter at %d write target len %d\n",
2567 subwriter.value_pos,
2568 _dbus_string_get_length (subwriter.value_str));
2571 if (!writer_write_reader_helper (&subwriter, &subreader, start_after,
2572 start_after_new_pos, start_after_new_len,
2574 inside_start_after ||
2575 this_is_start_after))
2578 #if RECURSIVE_MARSHAL_WRITE_TRACE
2579 _dbus_verbose ("about to unrecurse from %s subreader at %d writer at %d subwriter at %d write target len %d\n",
2580 _dbus_type_to_string (current_type),
2581 subreader.value_pos,
2583 subwriter.value_pos,
2584 _dbus_string_get_length (writer->value_str));
2587 if (!inside_start_after && !this_is_start_after)
2588 enable_if_after (writer, &subreader, start_after);
2589 past_start_after = writer->enabled;
2590 if (!_dbus_type_writer_unrecurse (writer, &subwriter))
2593 /* If we weren't enabled when we recursed, we didn't
2594 * write an array len; if we passed start_after
2595 * somewhere inside the array, then we need to generate
2598 if (start_after != NULL &&
2599 !enabled_at_recurse && past_start_after &&
2600 current_type == DBUS_TYPE_ARRAY &&
2603 DBusArrayLenFixup fixup;
2604 int bytes_written_after_start_after;
2605 int bytes_before_start_after;
2608 /* this subwriter access is moderately unkosher since we
2609 * already unrecursed, but it works as long as unrecurse
2610 * doesn't break us on purpose
2612 bytes_written_after_start_after = writer_get_array_len (&subwriter);
2614 bytes_before_start_after =
2615 start_after->value_pos - reader_array_start_pos;
2617 fixup.len_pos_in_reader = reader_array_len_pos;
2619 bytes_before_start_after +
2620 start_after_new_len +
2621 bytes_written_after_start_after;
2623 _dbus_assert (_DBUS_ALIGN_VALUE (fixup.len_pos_in_reader, 4) ==
2624 (unsigned) fixup.len_pos_in_reader);
2626 old_len = _dbus_unpack_uint32 (reader->byte_order,
2627 _dbus_string_get_const_data_len (reader->value_str,
2628 fixup.len_pos_in_reader, 4));
2630 if (old_len != fixup.new_len && !append_fixup (fixups, &fixup))
2633 #if RECURSIVE_MARSHAL_WRITE_TRACE
2634 _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",
2635 fixup.len_pos_in_reader,
2637 reader_array_start_pos,
2638 start_after->value_pos,
2639 bytes_before_start_after,
2640 start_after_new_len,
2641 bytes_written_after_start_after);
2649 _dbus_assert (_dbus_type_is_basic (current_type));
2651 #if RECURSIVE_MARSHAL_WRITE_TRACE
2652 _dbus_verbose ("Reading basic value %s at %d\n",
2653 _dbus_type_to_string (current_type),
2657 _dbus_type_reader_read_basic (reader, &val);
2659 #if RECURSIVE_MARSHAL_WRITE_TRACE
2660 _dbus_verbose ("Writing basic value %s at %d write target len %d inside_start_after = %d\n",
2661 _dbus_type_to_string (current_type),
2663 _dbus_string_get_length (writer->value_str),
2664 inside_start_after);
2666 if (!inside_start_after)
2667 enable_if_after (writer, reader, start_after);
2668 if (!_dbus_type_writer_write_basic (writer, current_type, &val))
2670 #if RECURSIVE_MARSHAL_WRITE_TRACE
2671 _dbus_verbose ("Wrote basic value %s, new value_pos %d write target len %d\n",
2672 _dbus_type_to_string (current_type),
2674 _dbus_string_get_length (writer->value_str));
2678 _dbus_type_reader_next (reader);
2685 apply_and_free_fixups (fixups, NULL); /* NULL for reader to apply to */
2691 * Iterate through all values in the given reader, writing a copy of
2692 * each value to the writer. The reader will be moved forward to its
2695 * If a reader start_after is provided, it should be a reader for the
2696 * same data as the reader to be written. Only values occurring after
2697 * the value pointed to by start_after will be written to the writer.
2699 * If start_after is provided, then the copy of the reader will be
2700 * partial. This means that array lengths will not have been copied.
2701 * The assumption is that you wrote a new version of the value at
2702 * start_after to the writer. You have to pass in the start position
2703 * and length of the new value. (If you are deleting the value
2704 * at start_after, pass in 0 for the length.)
2706 * If the fixups parameter is non-#NULL, then any array length that
2707 * was read but not written due to start_after will be provided
2708 * as a #DBusArrayLenFixup. The fixup contains the position of the
2709 * array length in the source data, and the correct array length
2710 * assuming you combine the source data before start_after with
2711 * the written data at start_after and beyond.
2713 * @param writer the writer to copy to
2714 * @param reader the reader to copy from
2715 * @param start_after #NULL or a reader showing where to start
2716 * @param start_after_new_pos the position of start_after equivalent in the target data
2717 * @param start_after_new_len the length of start_after equivalent in the target data
2718 * @param fixups list to append #DBusArrayLenFixup if the write was partial
2719 * @returns #FALSE if no memory
2722 _dbus_type_writer_write_reader_partial (DBusTypeWriter *writer,
2723 DBusTypeReader *reader,
2724 const DBusTypeReader *start_after,
2725 int start_after_new_pos,
2726 int start_after_new_len,
2729 DBusTypeWriter orig;
2736 orig_type_len = _dbus_string_get_length (writer->type_str);
2737 orig_value_len = _dbus_string_get_length (writer->value_str);
2738 orig_enabled = writer->enabled;
2741 _dbus_type_writer_set_enabled (writer, FALSE);
2743 if (!writer_write_reader_helper (writer, reader, start_after,
2744 start_after_new_pos,
2745 start_after_new_len,
2749 _dbus_type_writer_set_enabled (writer, orig_enabled);
2753 if (!writer->type_pos_is_expectation)
2755 new_bytes = _dbus_string_get_length (writer->type_str) - orig_type_len;
2756 _dbus_string_delete (writer->type_str, orig.type_pos, new_bytes);
2758 new_bytes = _dbus_string_get_length (writer->value_str) - orig_value_len;
2759 _dbus_string_delete (writer->value_str, orig.value_pos, new_bytes);
2767 * Iterate through all values in the given reader, writing a copy of
2768 * each value to the writer. The reader will be moved forward to its
2771 * @param writer the writer to copy to
2772 * @param reader the reader to copy from
2773 * @returns #FALSE if no memory
2776 _dbus_type_writer_write_reader (DBusTypeWriter *writer,
2777 DBusTypeReader *reader)
2779 return _dbus_type_writer_write_reader_partial (writer, reader, NULL, 0, 0, NULL);
2783 * If disabled, a writer can still be iterated forward and recursed/unrecursed
2784 * but won't write any values. Types will still be written unless the
2785 * writer is a "values only" writer, because the writer needs access to
2786 * a valid signature to be able to iterate.
2788 * @param writer the type writer
2789 * @param enabled #TRUE if values should be written
2792 _dbus_type_writer_set_enabled (DBusTypeWriter *writer,
2793 dbus_bool_t enabled)
2795 writer->enabled = enabled != FALSE;
2798 /** @} */ /* end of DBusMarshal group */
2800 /* tests in dbus-marshal-recursive-util.c */