1 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
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-signature.h"
27 #include "dbus-internals.h"
30 * @addtogroup DBusMarshal
34 /** turn this on to get deluged in TypeReader verbose spam */
35 #define RECURSIVE_MARSHAL_READ_TRACE 0
37 /** turn this on to get deluged in TypeWriter verbose spam */
38 #define RECURSIVE_MARSHAL_WRITE_TRACE 0
41 free_fixups (DBusList **fixups)
45 link = _dbus_list_get_first_link (fixups);
50 next = _dbus_list_get_next_link (fixups, link);
52 dbus_free (link->data);
53 _dbus_list_free_link (link);
62 apply_and_free_fixups (DBusList **fixups,
63 DBusTypeReader *reader)
67 #if RECURSIVE_MARSHAL_WRITE_TRACE
69 _dbus_verbose (" %d FIXUPS to apply\n",
70 _dbus_list_get_length (fixups));
73 link = _dbus_list_get_first_link (fixups);
78 next = _dbus_list_get_next_link (fixups, link);
86 #if RECURSIVE_MARSHAL_WRITE_TRACE
87 _dbus_verbose (" applying FIXUP to reader %p at pos %d new_len = %d old len %d\n",
88 reader, f->len_pos_in_reader, f->new_len,
89 _dbus_marshal_read_uint32 (reader->value_str,
91 reader->byte_order, NULL));
94 _dbus_marshal_set_uint32 ((DBusString*) reader->value_str,
100 dbus_free (link->data);
101 _dbus_list_free_link (link);
110 * Virtual table for a type reader.
112 struct DBusTypeReaderClass
114 const char *name; /**< name for debugging */
115 int id; /**< index in all_reader_classes */
116 dbus_bool_t types_only; /**< only iterates over types, not values */
117 void (* recurse) (DBusTypeReader *sub,
118 DBusTypeReader *parent); /**< recurse with this reader as sub */
119 dbus_bool_t (* check_finished) (const DBusTypeReader *reader); /**< check whether reader is at the end */
120 void (* next) (DBusTypeReader *reader,
121 int current_type); /**< go to the next value */
125 element_type_get_alignment (const DBusString *str,
128 return _dbus_type_get_alignment (_dbus_first_type_in_signature (str, pos));
132 reader_init (DBusTypeReader *reader,
134 const DBusString *type_str,
136 const DBusString *value_str,
139 reader->byte_order = byte_order;
140 reader->finished = FALSE;
141 reader->type_str = type_str;
142 reader->type_pos = type_pos;
143 reader->value_str = value_str;
144 reader->value_pos = value_pos;
148 base_reader_recurse (DBusTypeReader *sub,
149 DBusTypeReader *parent)
151 /* point subreader at the same place as parent */
161 struct_or_dict_entry_types_only_reader_recurse (DBusTypeReader *sub,
162 DBusTypeReader *parent)
164 base_reader_recurse (sub, parent);
166 _dbus_assert (_dbus_string_get_byte (sub->type_str,
167 sub->type_pos) == DBUS_STRUCT_BEGIN_CHAR ||
168 _dbus_string_get_byte (sub->type_str,
169 sub->type_pos) == DBUS_DICT_ENTRY_BEGIN_CHAR);
175 struct_or_dict_entry_reader_recurse (DBusTypeReader *sub,
176 DBusTypeReader *parent)
178 struct_or_dict_entry_types_only_reader_recurse (sub, parent);
180 /* struct and dict entry have 8 byte alignment */
181 sub->value_pos = _DBUS_ALIGN_VALUE (sub->value_pos, 8);
185 array_types_only_reader_recurse (DBusTypeReader *sub,
186 DBusTypeReader *parent)
188 base_reader_recurse (sub, parent);
190 /* point type_pos at the array element type */
193 /* Init with values likely to crash things if misused */
194 sub->u.array.start_pos = _DBUS_INT_MAX;
195 sub->array_len_offset = 7;
198 /** compute position of array length given array_len_offset, which is
199 the offset back from start_pos to end of the len */
200 #define ARRAY_READER_LEN_POS(reader) \
201 ((reader)->u.array.start_pos - ((int)(reader)->array_len_offset) - 4)
204 array_reader_get_array_len (const DBusTypeReader *reader)
206 dbus_uint32_t array_len;
209 len_pos = ARRAY_READER_LEN_POS (reader);
211 _dbus_assert (_DBUS_ALIGN_VALUE (len_pos, 4) == (unsigned) len_pos);
212 array_len = _dbus_unpack_uint32 (reader->byte_order,
213 _dbus_string_get_const_data_len (reader->value_str, len_pos, 4));
215 #if RECURSIVE_MARSHAL_READ_TRACE
216 _dbus_verbose (" reader %p len_pos %d array len %u len_offset %d\n",
217 reader, len_pos, array_len, reader->array_len_offset);
220 _dbus_assert (reader->u.array.start_pos - len_pos - 4 < 8);
226 array_reader_recurse (DBusTypeReader *sub,
227 DBusTypeReader *parent)
232 array_types_only_reader_recurse (sub, parent);
234 sub->value_pos = _DBUS_ALIGN_VALUE (sub->value_pos, 4);
236 len_pos = sub->value_pos;
238 sub->value_pos += 4; /* for the length */
240 alignment = element_type_get_alignment (sub->type_str,
243 sub->value_pos = _DBUS_ALIGN_VALUE (sub->value_pos, alignment);
245 sub->u.array.start_pos = sub->value_pos;
246 _dbus_assert ((sub->u.array.start_pos - (len_pos + 4)) < 8); /* only 3 bits in array_len_offset */
247 sub->array_len_offset = sub->u.array.start_pos - (len_pos + 4);
249 #if RECURSIVE_MARSHAL_READ_TRACE
250 _dbus_verbose (" type reader %p array start = %d len_offset = %d array len = %d array element type = %s\n",
252 sub->u.array.start_pos,
253 sub->array_len_offset,
254 array_reader_get_array_len (sub),
255 _dbus_type_to_string (_dbus_first_type_in_signature (sub->type_str,
261 variant_reader_recurse (DBusTypeReader *sub,
262 DBusTypeReader *parent)
265 int contained_alignment;
267 base_reader_recurse (sub, parent);
269 /* Variant is 1 byte sig length (without nul), signature with nul,
270 * padding to 8-boundary, then values
273 sig_len = _dbus_string_get_byte (sub->value_str, sub->value_pos);
275 sub->type_str = sub->value_str;
276 sub->type_pos = sub->value_pos + 1;
278 sub->value_pos = sub->type_pos + sig_len + 1;
280 contained_alignment = _dbus_type_get_alignment (_dbus_first_type_in_signature (sub->type_str,
283 sub->value_pos = _DBUS_ALIGN_VALUE (sub->value_pos, contained_alignment);
285 #if RECURSIVE_MARSHAL_READ_TRACE
286 _dbus_verbose (" type reader %p variant containing '%s'\n",
288 _dbus_string_get_const_data_len (sub->type_str,
294 array_reader_check_finished (const DBusTypeReader *reader)
298 /* return the array element type if elements remain, and
299 * TYPE_INVALID otherwise
302 end_pos = reader->u.array.start_pos + array_reader_get_array_len (reader);
304 _dbus_assert (reader->value_pos <= end_pos);
305 _dbus_assert (reader->value_pos >= reader->u.array.start_pos);
307 return reader->value_pos == end_pos;
311 skip_one_complete_type (const DBusString *type_str,
314 _dbus_type_signature_next (_dbus_string_get_const_data (type_str),
319 * Skips to the next "complete" type inside a type signature.
320 * The signature is read starting at type_pos, and the next
321 * type position is stored in the same variable.
323 * @param type_str a type signature (must be valid)
324 * @param type_pos an integer position in the type signature (in and out)
327 _dbus_type_signature_next (const char *type_str,
330 const unsigned char *p;
331 const unsigned char *start;
333 _dbus_assert (type_str != NULL);
334 _dbus_assert (type_pos != NULL);
337 p = start + *type_pos;
339 _dbus_assert (*p != DBUS_STRUCT_END_CHAR);
340 _dbus_assert (*p != DBUS_DICT_ENTRY_END_CHAR);
342 while (*p == DBUS_TYPE_ARRAY)
345 _dbus_assert (*p != DBUS_STRUCT_END_CHAR);
346 _dbus_assert (*p != DBUS_DICT_ENTRY_END_CHAR);
348 if (*p == DBUS_STRUCT_BEGIN_CHAR)
356 _dbus_assert (*p != DBUS_TYPE_INVALID);
360 _dbus_assert (*p != DBUS_TYPE_INVALID);
362 if (*p == DBUS_STRUCT_BEGIN_CHAR)
364 else if (*p == DBUS_STRUCT_END_CHAR)
375 else if (*p == DBUS_DICT_ENTRY_BEGIN_CHAR)
383 _dbus_assert (*p != DBUS_TYPE_INVALID);
387 _dbus_assert (*p != DBUS_TYPE_INVALID);
389 if (*p == DBUS_DICT_ENTRY_BEGIN_CHAR)
391 else if (*p == DBUS_DICT_ENTRY_END_CHAR)
407 *type_pos = (int) (p - start);
411 find_len_of_complete_type (const DBusString *type_str,
418 skip_one_complete_type (type_str, &end);
420 return end - type_pos;
424 base_reader_next (DBusTypeReader *reader,
427 switch (current_type)
429 case DBUS_TYPE_DICT_ENTRY:
430 case DBUS_TYPE_STRUCT:
431 case DBUS_TYPE_VARIANT:
432 /* Scan forward over the entire container contents */
436 if (reader->klass->types_only && current_type == DBUS_TYPE_VARIANT)
440 /* Recurse into the struct or variant */
441 _dbus_type_reader_recurse (reader, &sub);
443 /* Skip everything in this subreader */
444 while (_dbus_type_reader_next (&sub))
449 if (!reader->klass->types_only)
450 reader->value_pos = sub.value_pos;
452 /* Now we are at the end of this container; for variants, the
453 * subreader's type_pos is totally inapplicable (it's in the
454 * value string) but we know that we increment by one past the
457 if (current_type == DBUS_TYPE_VARIANT)
458 reader->type_pos += 1;
460 reader->type_pos = sub.type_pos;
464 case DBUS_TYPE_ARRAY:
466 if (!reader->klass->types_only)
467 _dbus_marshal_skip_array (reader->value_str,
468 _dbus_first_type_in_signature (reader->type_str,
469 reader->type_pos + 1),
473 skip_one_complete_type (reader->type_str, &reader->type_pos);
478 if (!reader->klass->types_only)
479 _dbus_marshal_skip_basic (reader->value_str,
480 current_type, reader->byte_order,
483 reader->type_pos += 1;
489 struct_reader_next (DBusTypeReader *reader,
494 base_reader_next (reader, current_type);
496 /* for STRUCT containers we return FALSE at the end of the struct,
497 * for INVALID we return FALSE at the end of the signature.
498 * In both cases we arrange for get_current_type() to return INVALID
499 * which is defined to happen iff we're at the end (no more next())
501 t = _dbus_string_get_byte (reader->type_str, reader->type_pos);
502 if (t == DBUS_STRUCT_END_CHAR)
504 reader->type_pos += 1;
505 reader->finished = TRUE;
510 dict_entry_reader_next (DBusTypeReader *reader,
515 base_reader_next (reader, current_type);
517 /* for STRUCT containers we return FALSE at the end of the struct,
518 * for INVALID we return FALSE at the end of the signature.
519 * In both cases we arrange for get_current_type() to return INVALID
520 * which is defined to happen iff we're at the end (no more next())
522 t = _dbus_string_get_byte (reader->type_str, reader->type_pos);
523 if (t == DBUS_DICT_ENTRY_END_CHAR)
525 reader->type_pos += 1;
526 reader->finished = TRUE;
531 array_types_only_reader_next (DBusTypeReader *reader,
534 /* We have one "element" to be iterated over
535 * in each array, which is its element type.
536 * So the finished flag indicates whether we've
537 * iterated over it yet or not.
539 reader->finished = TRUE;
543 array_reader_next (DBusTypeReader *reader,
546 /* Skip one array element */
549 end_pos = reader->u.array.start_pos + array_reader_get_array_len (reader);
551 #if RECURSIVE_MARSHAL_READ_TRACE
552 _dbus_verbose (" reader %p array next START start_pos = %d end_pos = %d value_pos = %d current_type = %s\n",
554 reader->u.array.start_pos,
555 end_pos, reader->value_pos,
556 _dbus_type_to_string (current_type));
559 _dbus_assert (reader->value_pos < end_pos);
560 _dbus_assert (reader->value_pos >= reader->u.array.start_pos);
562 switch (_dbus_first_type_in_signature (reader->type_str,
565 case DBUS_TYPE_DICT_ENTRY:
566 case DBUS_TYPE_STRUCT:
567 case DBUS_TYPE_VARIANT:
571 /* Recurse into the struct or variant */
572 _dbus_type_reader_recurse (reader, &sub);
574 /* Skip everything in this element */
575 while (_dbus_type_reader_next (&sub))
580 /* Now we are at the end of this element */
581 reader->value_pos = sub.value_pos;
585 case DBUS_TYPE_ARRAY:
587 _dbus_marshal_skip_array (reader->value_str,
588 _dbus_first_type_in_signature (reader->type_str,
589 reader->type_pos + 1),
597 _dbus_marshal_skip_basic (reader->value_str,
598 current_type, reader->byte_order,
604 #if RECURSIVE_MARSHAL_READ_TRACE
605 _dbus_verbose (" reader %p array next END start_pos = %d end_pos = %d value_pos = %d current_type = %s\n",
607 reader->u.array.start_pos,
608 end_pos, reader->value_pos,
609 _dbus_type_to_string (current_type));
612 _dbus_assert (reader->value_pos <= end_pos);
614 if (reader->value_pos == end_pos)
616 skip_one_complete_type (reader->type_str,
621 static const DBusTypeReaderClass body_reader_class = {
624 NULL, /* body is always toplevel, so doesn't get recursed into */
629 static const DBusTypeReaderClass body_types_only_reader_class = {
632 NULL, /* body is always toplevel, so doesn't get recursed into */
637 static const DBusTypeReaderClass struct_reader_class = {
640 struct_or_dict_entry_reader_recurse,
645 static const DBusTypeReaderClass struct_types_only_reader_class = {
648 struct_or_dict_entry_types_only_reader_recurse,
653 static const DBusTypeReaderClass dict_entry_reader_class = {
656 struct_or_dict_entry_reader_recurse,
658 dict_entry_reader_next
661 static const DBusTypeReaderClass dict_entry_types_only_reader_class = {
662 "dict_entry types", 5,
664 struct_or_dict_entry_types_only_reader_recurse,
666 dict_entry_reader_next
669 static const DBusTypeReaderClass array_reader_class = {
672 array_reader_recurse,
673 array_reader_check_finished,
677 static const DBusTypeReaderClass array_types_only_reader_class = {
680 array_types_only_reader_recurse,
682 array_types_only_reader_next
685 static const DBusTypeReaderClass variant_reader_class = {
688 variant_reader_recurse,
693 static const DBusTypeReaderClass * const
694 all_reader_classes[] = {
696 &body_types_only_reader_class,
697 &struct_reader_class,
698 &struct_types_only_reader_class,
699 &dict_entry_reader_class,
700 &dict_entry_types_only_reader_class,
702 &array_types_only_reader_class,
703 &variant_reader_class
707 * Initializes a type reader.
709 * @param reader the reader
710 * @param byte_order the byte order of the block to read
711 * @param type_str the signature of the block to read
712 * @param type_pos location of signature
713 * @param value_str the string containing values block
714 * @param value_pos start of values block
717 _dbus_type_reader_init (DBusTypeReader *reader,
719 const DBusString *type_str,
721 const DBusString *value_str,
724 reader->klass = &body_reader_class;
726 reader_init (reader, byte_order, type_str, type_pos,
727 value_str, value_pos);
729 #if RECURSIVE_MARSHAL_READ_TRACE
730 _dbus_verbose (" type reader %p init type_pos = %d value_pos = %d remaining sig '%s'\n",
731 reader, reader->type_pos, reader->value_pos,
732 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0));
737 * Like _dbus_type_reader_init() but the iteration is over the
738 * signature, not over values.
740 * @param reader the reader
741 * @param type_str the signature string
742 * @param type_pos location in the signature string
745 _dbus_type_reader_init_types_only (DBusTypeReader *reader,
746 const DBusString *type_str,
749 reader->klass = &body_types_only_reader_class;
751 reader_init (reader, DBUS_COMPILER_BYTE_ORDER /* irrelevant */,
752 type_str, type_pos, NULL, _DBUS_INT_MAX /* crashes if we screw up */);
754 #if RECURSIVE_MARSHAL_READ_TRACE
755 _dbus_verbose (" type reader %p init types only type_pos = %d remaining sig '%s'\n",
756 reader, reader->type_pos,
757 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0));
762 * Gets the type of the value the reader is currently pointing to;
763 * or for a types-only reader gets the type it's currently pointing to.
764 * If the reader is at the end of a block or end of a container such
765 * as an array, returns #DBUS_TYPE_INVALID.
767 * @param reader the reader
770 _dbus_type_reader_get_current_type (const DBusTypeReader *reader)
774 if (reader->finished ||
775 (reader->klass->check_finished &&
776 (* reader->klass->check_finished) (reader)))
777 t = DBUS_TYPE_INVALID;
779 t = _dbus_first_type_in_signature (reader->type_str,
782 _dbus_assert (t != DBUS_STRUCT_END_CHAR);
783 _dbus_assert (t != DBUS_STRUCT_BEGIN_CHAR);
784 _dbus_assert (t != DBUS_DICT_ENTRY_END_CHAR);
785 _dbus_assert (t != DBUS_DICT_ENTRY_BEGIN_CHAR);
788 _dbus_verbose (" type reader %p current type_pos = %d type = %s\n",
789 reader, reader->type_pos,
790 _dbus_type_to_string (t));
797 * Gets the type of an element of the array the reader is currently
798 * pointing to. It's an error to call this if
799 * _dbus_type_reader_get_current_type() doesn't return #DBUS_TYPE_ARRAY
802 * @param reader the reader
805 _dbus_type_reader_get_element_type (const DBusTypeReader *reader)
809 _dbus_assert (_dbus_type_reader_get_current_type (reader) == DBUS_TYPE_ARRAY);
811 element_type = _dbus_first_type_in_signature (reader->type_str,
812 reader->type_pos + 1);
818 * Gets the current position in the value block
819 * @param reader the reader
822 _dbus_type_reader_get_value_pos (const DBusTypeReader *reader)
824 return reader->value_pos;
828 * Get the address of the marshaled value in the data being read. The
829 * address may not be aligned; you have to align it to the type of the
830 * value you want to read. Most of the demarshal routines do this for
833 * @param reader the reader
834 * @param value_location the address of the marshaled value
837 _dbus_type_reader_read_raw (const DBusTypeReader *reader,
838 const unsigned char **value_location)
840 _dbus_assert (!reader->klass->types_only);
842 *value_location = _dbus_string_get_const_data_len (reader->value_str,
848 * Reads a basic-typed value, as with _dbus_marshal_read_basic().
850 * @param reader the reader
851 * @param value the address of the value
854 _dbus_type_reader_read_basic (const DBusTypeReader *reader,
859 _dbus_assert (!reader->klass->types_only);
861 t = _dbus_type_reader_get_current_type (reader);
863 _dbus_marshal_read_basic (reader->value_str,
870 #if RECURSIVE_MARSHAL_READ_TRACE
871 _dbus_verbose (" type reader %p read basic type_pos = %d value_pos = %d remaining sig '%s'\n",
872 reader, reader->type_pos, reader->value_pos,
873 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0));
878 * Returns the number of bytes in the array.
880 * @param reader the reader to read from
881 * @returns the number of bytes in the array
884 _dbus_type_reader_get_array_length (const DBusTypeReader *reader)
886 _dbus_assert (!reader->klass->types_only);
887 _dbus_assert (reader->klass == &array_reader_class);
889 return array_reader_get_array_len (reader);
893 * Reads a block of fixed-length basic values, from the current point
894 * in an array to the end of the array. Does not work for arrays of
895 * string or container types.
897 * This function returns the array in-place; it does not make a copy,
898 * and it does not swap the bytes.
900 * If you ask for #DBUS_TYPE_DOUBLE you will get a "const double*" back
901 * and the "value" argument should be a "const double**" and so on.
903 * @param reader the reader to read from
904 * @param value place to return the array values
905 * @param n_elements place to return number of array elements
908 _dbus_type_reader_read_fixed_multi (const DBusTypeReader *reader,
918 _dbus_assert (!reader->klass->types_only);
919 _dbus_assert (reader->klass == &array_reader_class);
921 element_type = _dbus_first_type_in_signature (reader->type_str,
924 _dbus_assert (element_type != DBUS_TYPE_INVALID); /* why we don't use get_current_type() */
925 _dbus_assert (dbus_type_is_fixed (element_type));
927 alignment = _dbus_type_get_alignment (element_type);
929 _dbus_assert (reader->value_pos >= reader->u.array.start_pos);
931 total_len = array_reader_get_array_len (reader);
932 end_pos = reader->u.array.start_pos + total_len;
933 remaining_len = end_pos - reader->value_pos;
935 #if RECURSIVE_MARSHAL_READ_TRACE
936 _dbus_verbose ("end_pos %d total_len %d remaining_len %d value_pos %d\n",
937 end_pos, total_len, remaining_len, reader->value_pos);
940 _dbus_assert (remaining_len <= total_len);
942 if (remaining_len == 0)
943 *(const DBusBasicValue**) value = NULL;
945 *(const DBusBasicValue**) value =
946 (void*) _dbus_string_get_const_data_len (reader->value_str,
950 *n_elements = remaining_len / alignment;
951 _dbus_assert ((remaining_len % alignment) == 0);
953 #if RECURSIVE_MARSHAL_READ_TRACE
954 _dbus_verbose (" type reader %p read fixed array type_pos = %d value_pos = %d remaining sig '%s'\n",
955 reader, reader->type_pos, reader->value_pos,
956 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0));
961 * Initialize a new reader pointing to the first type and
962 * corresponding value that's a child of the current container. It's
963 * an error to call this if the current type is a non-container.
965 * Note that DBusTypeReader traverses values, not types. So if you
966 * have an empty array of array of int, you can't recurse into it. You
967 * can only recurse into each element.
969 * @param reader the reader
970 * @param sub a reader to init pointing to the first child
973 _dbus_type_reader_recurse (DBusTypeReader *reader,
978 t = _dbus_first_type_in_signature (reader->type_str, reader->type_pos);
982 case DBUS_TYPE_STRUCT:
983 if (reader->klass->types_only)
984 sub->klass = &struct_types_only_reader_class;
986 sub->klass = &struct_reader_class;
988 case DBUS_TYPE_DICT_ENTRY:
989 if (reader->klass->types_only)
990 sub->klass = &dict_entry_types_only_reader_class;
992 sub->klass = &dict_entry_reader_class;
994 case DBUS_TYPE_ARRAY:
995 if (reader->klass->types_only)
996 sub->klass = &array_types_only_reader_class;
998 sub->klass = &array_reader_class;
1000 case DBUS_TYPE_VARIANT:
1001 if (reader->klass->types_only)
1002 _dbus_assert_not_reached ("can't recurse into variant typecode");
1004 sub->klass = &variant_reader_class;
1007 _dbus_verbose ("recursing into type %s\n", _dbus_type_to_string (t));
1008 #ifndef DBUS_DISABLE_CHECKS
1009 if (t == DBUS_TYPE_INVALID)
1010 _dbus_warn_check_failed ("You can't recurse into an empty array or off the end of a message body\n");
1011 #endif /* DBUS_DISABLE_CHECKS */
1013 _dbus_assert_not_reached ("don't yet handle recursing into this type");
1016 _dbus_assert (sub->klass == all_reader_classes[sub->klass->id]);
1018 (* sub->klass->recurse) (sub, reader);
1020 #if RECURSIVE_MARSHAL_READ_TRACE
1021 _dbus_verbose (" type reader %p RECURSED type_pos = %d value_pos = %d remaining sig '%s'\n",
1022 sub, sub->type_pos, sub->value_pos,
1023 _dbus_string_get_const_data_len (sub->type_str, sub->type_pos, 0));
1028 * Skip to the next value on this "level". e.g. the next field in a
1029 * struct, the next value in an array. Returns FALSE at the end of the
1030 * current container.
1032 * @param reader the reader
1033 * @returns FALSE if nothing more to read at or below this level
1036 _dbus_type_reader_next (DBusTypeReader *reader)
1040 t = _dbus_type_reader_get_current_type (reader);
1042 #if RECURSIVE_MARSHAL_READ_TRACE
1043 _dbus_verbose (" type reader %p START next() { type_pos = %d value_pos = %d remaining sig '%s' current_type = %s\n",
1044 reader, reader->type_pos, reader->value_pos,
1045 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0),
1046 _dbus_type_to_string (t));
1049 if (t == DBUS_TYPE_INVALID)
1052 (* reader->klass->next) (reader, t);
1054 #if RECURSIVE_MARSHAL_READ_TRACE
1055 _dbus_verbose (" type reader %p END next() type_pos = %d value_pos = %d remaining sig '%s' current_type = %s\n",
1056 reader, reader->type_pos, reader->value_pos,
1057 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0),
1058 _dbus_type_to_string (_dbus_type_reader_get_current_type (reader)));
1061 return _dbus_type_reader_get_current_type (reader) != DBUS_TYPE_INVALID;
1065 * Check whether there's another value on this "level". e.g. the next
1066 * field in a struct, the next value in an array. Returns FALSE at the
1067 * end of the current container.
1069 * You probably don't want to use this; it makes for an awkward for/while
1070 * loop. A nicer one is "while ((current_type = get_current_type()) != INVALID)"
1072 * @param reader the reader
1073 * @returns FALSE if nothing more to read at or below this level
1076 _dbus_type_reader_has_next (const DBusTypeReader *reader)
1078 /* Not efficient but works for now. */
1079 DBusTypeReader copy;
1082 return _dbus_type_reader_next (©);
1086 * Gets the string and range of said string containing the signature
1087 * of the current value. Essentially a more complete version of
1088 * _dbus_type_reader_get_current_type() (returns the full type
1089 * rather than only the outside of the onion).
1091 * Note though that the first byte in a struct signature is
1092 * #DBUS_STRUCT_BEGIN_CHAR while the current type will be
1093 * #DBUS_TYPE_STRUCT so it isn't true that the first byte of the
1094 * signature is always the same as the current type. Another
1095 * difference is that this function will still return a signature when
1096 * inside an empty array; say you recurse into empty array of int32,
1097 * the signature is "i" but the current type will always be
1098 * #DBUS_TYPE_INVALID since there are no elements to be currently
1101 * @param reader the reader
1102 * @param str_p place to return the string with the type in it
1103 * @param start_p place to return start of the type
1104 * @param len_p place to return the length of the type
1107 _dbus_type_reader_get_signature (const DBusTypeReader *reader,
1108 const DBusString **str_p,
1112 *str_p = reader->type_str;
1113 *start_p = reader->type_pos;
1114 *len_p = find_len_of_complete_type (reader->type_str, reader->type_pos);
1119 DBusString replacement; /**< Marshaled value including alignment padding */
1120 int padding; /**< How much of the replacement block is padding */
1124 replacement_block_init (ReplacementBlock *block,
1125 DBusTypeReader *reader)
1127 if (!_dbus_string_init (&block->replacement))
1130 /* % 8 is the padding to have the same align properties in
1131 * our replacement string as we do at the position being replaced
1133 block->padding = reader->value_pos % 8;
1135 if (!_dbus_string_lengthen (&block->replacement, block->padding))
1141 _dbus_string_free (&block->replacement);
1146 replacement_block_replace (ReplacementBlock *block,
1147 DBusTypeReader *reader,
1148 const DBusTypeReader *realign_root)
1150 DBusTypeWriter writer;
1151 DBusTypeReader realign_reader;
1155 _dbus_assert (realign_root != NULL);
1157 orig_len = _dbus_string_get_length (&block->replacement);
1159 realign_reader = *realign_root;
1161 #if RECURSIVE_MARSHAL_WRITE_TRACE
1162 _dbus_verbose ("INITIALIZING replacement block writer %p at value_pos %d\n",
1163 &writer, _dbus_string_get_length (&block->replacement));
1165 _dbus_type_writer_init_values_only (&writer,
1166 realign_reader.byte_order,
1167 realign_reader.type_str,
1168 realign_reader.type_pos,
1169 &block->replacement,
1170 _dbus_string_get_length (&block->replacement));
1172 _dbus_assert (realign_reader.value_pos <= reader->value_pos);
1174 #if RECURSIVE_MARSHAL_WRITE_TRACE
1175 _dbus_verbose ("COPYING from reader at value_pos %d to writer %p starting after value_pos %d\n",
1176 realign_reader.value_pos, &writer, reader->value_pos);
1179 if (!_dbus_type_writer_write_reader_partial (&writer,
1183 _dbus_string_get_length (&block->replacement) - block->padding,
1187 #if RECURSIVE_MARSHAL_WRITE_TRACE
1188 _dbus_verbose ("REPLACEMENT at padding %d len %d\n", block->padding,
1189 _dbus_string_get_length (&block->replacement) - block->padding);
1190 _dbus_verbose_bytes_of_string (&block->replacement, block->padding,
1191 _dbus_string_get_length (&block->replacement) - block->padding);
1192 _dbus_verbose ("TO BE REPLACED at value_pos = %d (align pad %d) len %d realign_reader.value_pos %d\n",
1193 reader->value_pos, reader->value_pos % 8,
1194 realign_reader.value_pos - reader->value_pos,
1195 realign_reader.value_pos);
1196 _dbus_verbose_bytes_of_string (reader->value_str,
1198 realign_reader.value_pos - reader->value_pos);
1201 /* Move the replacement into position
1202 * (realign_reader should now be at the end of the block to be replaced)
1204 if (!_dbus_string_replace_len (&block->replacement, block->padding,
1205 _dbus_string_get_length (&block->replacement) - block->padding,
1206 (DBusString*) reader->value_str,
1208 realign_reader.value_pos - reader->value_pos))
1211 /* Process our fixups now that we can't have an OOM error */
1212 apply_and_free_fixups (&fixups, reader);
1217 _dbus_string_set_length (&block->replacement, orig_len);
1218 free_fixups (&fixups);
1223 replacement_block_free (ReplacementBlock *block)
1225 _dbus_string_free (&block->replacement);
1228 /* In the variable-length case, we have to fix alignment after we insert.
1229 * The strategy is as follows:
1231 * - pad a new string to have the same alignment as the
1232 * start of the current basic value
1233 * - write the new basic value
1234 * - copy from the original reader to the new string,
1235 * which will fix the alignment of types following
1237 * - this copy has to start at realign_root,
1238 * but not really write anything until it
1239 * passes the value being set
1240 * - as an optimization, we can stop copying
1241 * when the source and dest values are both
1242 * on an 8-boundary, since we know all following
1243 * padding and alignment will be identical
1244 * - copy the new string back to the original
1245 * string, replacing the relevant part of the
1247 * - now any arrays in the original string that
1248 * contained the replaced string may have the
1249 * wrong length; so we have to fix that
1252 reader_set_basic_variable_length (DBusTypeReader *reader,
1255 const DBusTypeReader *realign_root)
1258 ReplacementBlock block;
1259 DBusTypeWriter writer;
1261 _dbus_assert (realign_root != NULL);
1265 if (!replacement_block_init (&block, reader))
1268 /* Write the new basic value */
1269 #if RECURSIVE_MARSHAL_WRITE_TRACE
1270 _dbus_verbose ("INITIALIZING writer %p to write basic value at value_pos %d of replacement string\n",
1271 &writer, _dbus_string_get_length (&block.replacement));
1273 _dbus_type_writer_init_values_only (&writer,
1278 _dbus_string_get_length (&block.replacement));
1279 #if RECURSIVE_MARSHAL_WRITE_TRACE
1280 _dbus_verbose ("WRITING basic value to writer %p (replacement string)\n", &writer);
1282 if (!_dbus_type_writer_write_basic (&writer, current_type, value))
1285 if (!replacement_block_replace (&block,
1293 replacement_block_free (&block);
1298 reader_set_basic_fixed_length (DBusTypeReader *reader,
1302 _dbus_marshal_set_basic ((DBusString*) reader->value_str,
1311 * Sets a new value for the basic type value pointed to by the reader,
1312 * leaving the reader valid to continue reading. Any other readers
1313 * will be invalidated if you set a variable-length type such as a
1316 * The provided realign_root is the reader to start from when
1317 * realigning the data that follows the newly-set value. The reader
1318 * parameter must point to a value below the realign_root parameter.
1319 * If the type being set is fixed-length, then realign_root may be
1320 * #NULL. Only values reachable from realign_root will be realigned,
1321 * so if your string contains other values you will need to deal with
1322 * those somehow yourself. It is OK if realign_root is the same
1323 * reader as the reader parameter, though if you aren't setting the
1324 * root it may not be such a good idea.
1326 * @todo DBusTypeReader currently takes "const" versions of the type
1327 * and value strings, and this function modifies those strings by
1328 * casting away the const, which is of course bad if we want to get
1329 * picky. (To be truly clean you'd have an object which contained the
1330 * type and value strings and set_basic would be a method on that
1331 * object... this would also make DBusTypeReader the same thing as
1332 * DBusTypeMark. But since DBusMessage is effectively that object for
1333 * D-Bus it doesn't seem worth creating some random object.)
1335 * @todo optimize this by only rewriting until the old and new values
1336 * are at the same alignment. Frequently this should result in only
1337 * replacing the value that's immediately at hand.
1339 * @param reader reader indicating where to set a new value
1340 * @param value address of the value to set
1341 * @param realign_root realign from here
1342 * @returns #FALSE if not enough memory
1345 _dbus_type_reader_set_basic (DBusTypeReader *reader,
1347 const DBusTypeReader *realign_root)
1351 _dbus_assert (!reader->klass->types_only);
1352 _dbus_assert (reader->value_str == realign_root->value_str);
1353 _dbus_assert (reader->value_pos >= realign_root->value_pos);
1355 current_type = _dbus_type_reader_get_current_type (reader);
1357 #if RECURSIVE_MARSHAL_WRITE_TRACE
1358 _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",
1359 reader, reader->type_pos, reader->value_pos,
1360 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0),
1362 realign_root ? realign_root->value_pos : -1,
1363 _dbus_type_to_string (current_type));
1364 _dbus_verbose_bytes_of_string (realign_root->value_str, realign_root->value_pos,
1365 _dbus_string_get_length (realign_root->value_str) -
1366 realign_root->value_pos);
1369 _dbus_assert (dbus_type_is_basic (current_type));
1371 if (dbus_type_is_fixed (current_type))
1373 reader_set_basic_fixed_length (reader, current_type, value);
1378 _dbus_assert (realign_root != NULL);
1379 return reader_set_basic_variable_length (reader, current_type,
1380 value, realign_root);
1385 * Recursively deletes any value pointed to by the reader, leaving the
1386 * reader valid to continue reading. Any other readers will be
1389 * The provided realign_root is the reader to start from when
1390 * realigning the data that follows the newly-set value.
1391 * See _dbus_type_reader_set_basic() for more details on the
1392 * realign_root paramter.
1394 * @todo for now this does not delete the typecodes associated with
1395 * the value, so this function should only be used for array elements.
1397 * @param reader reader indicating where to delete a value
1398 * @param realign_root realign from here
1399 * @returns #FALSE if not enough memory
1402 _dbus_type_reader_delete (DBusTypeReader *reader,
1403 const DBusTypeReader *realign_root)
1406 ReplacementBlock block;
1408 _dbus_assert (realign_root != NULL);
1409 _dbus_assert (reader->klass == &array_reader_class);
1413 if (!replacement_block_init (&block, reader))
1416 if (!replacement_block_replace (&block,
1424 replacement_block_free (&block);
1429 * Compares two readers, which must be iterating over the same value data.
1430 * Returns #TRUE if the first parameter is further along than the second parameter.
1432 * @param lhs left-hand-side (first) parameter
1433 * @param rhs left-hand-side (first) parameter
1434 * @returns whether lhs is greater than rhs
1437 _dbus_type_reader_greater_than (const DBusTypeReader *lhs,
1438 const DBusTypeReader *rhs)
1440 _dbus_assert (lhs->value_str == rhs->value_str);
1442 return lhs->value_pos > rhs->value_pos;
1455 * Initialize a write iterator, which is used to write out values in
1456 * serialized D-Bus format.
1458 * The type_pos passed in is expected to be inside an already-valid,
1459 * though potentially empty, type signature. This means that the byte
1460 * after type_pos must be either #DBUS_TYPE_INVALID (aka nul) or some
1461 * other valid type. #DBusTypeWriter won't enforce that the signature
1462 * is already valid (you can append the nul byte at the end if you
1463 * like), but just be aware that you need the nul byte eventually and
1464 * #DBusTypeWriter isn't going to write it for you.
1466 * @param writer the writer to init
1467 * @param byte_order the byte order to marshal into
1468 * @param type_str the string to write typecodes into
1469 * @param type_pos where to insert typecodes
1470 * @param value_str the string to write values into
1471 * @param value_pos where to insert values
1475 _dbus_type_writer_init (DBusTypeWriter *writer,
1477 DBusString *type_str,
1479 DBusString *value_str,
1482 writer->byte_order = byte_order;
1483 writer->type_str = type_str;
1484 writer->type_pos = type_pos;
1485 writer->value_str = value_str;
1486 writer->value_pos = value_pos;
1487 writer->container_type = DBUS_TYPE_INVALID;
1488 writer->type_pos_is_expectation = FALSE;
1489 writer->enabled = TRUE;
1491 #if RECURSIVE_MARSHAL_WRITE_TRACE
1492 _dbus_verbose ("writer %p init remaining sig '%s'\n", writer,
1494 _dbus_string_get_const_data_len (writer->type_str, writer->type_pos, 0) :
1500 * Initialize a write iterator, with the signature to be provided
1503 * @param writer the writer to init
1504 * @param byte_order the byte order to marshal into
1505 * @param value_str the string to write values into
1506 * @param value_pos where to insert values
1510 _dbus_type_writer_init_types_delayed (DBusTypeWriter *writer,
1512 DBusString *value_str,
1515 _dbus_type_writer_init (writer, byte_order,
1516 NULL, 0, value_str, value_pos);
1520 * Adds type string to the writer, if it had none.
1522 * @param writer the writer to init
1523 * @param type_str type string to add
1524 * @param type_pos type position
1528 _dbus_type_writer_add_types (DBusTypeWriter *writer,
1529 DBusString *type_str,
1532 if (writer->type_str == NULL) /* keeps us from using this as setter */
1534 writer->type_str = type_str;
1535 writer->type_pos = type_pos;
1540 * Removes type string from the writer.
1542 * @param writer the writer to remove from
1545 _dbus_type_writer_remove_types (DBusTypeWriter *writer)
1547 writer->type_str = NULL;
1548 writer->type_pos = -1;
1552 * Like _dbus_type_writer_init(), except the type string
1553 * passed in should correspond to an existing signature that
1554 * matches what you're going to write out. The writer will
1555 * check what you write vs. this existing signature.
1557 * @param writer the writer to init
1558 * @param byte_order the byte order to marshal into
1559 * @param type_str the string with signature
1560 * @param type_pos start of signature
1561 * @param value_str the string to write values into
1562 * @param value_pos where to insert values
1566 _dbus_type_writer_init_values_only (DBusTypeWriter *writer,
1568 const DBusString *type_str,
1570 DBusString *value_str,
1573 _dbus_type_writer_init (writer, byte_order,
1574 (DBusString*)type_str, type_pos,
1575 value_str, value_pos);
1577 writer->type_pos_is_expectation = TRUE;
1581 _dbus_type_writer_write_basic_no_typecode (DBusTypeWriter *writer,
1585 if (writer->enabled)
1586 return _dbus_marshal_write_basic (writer->value_str,
1591 &writer->value_pos);
1596 /* If our parent is an array, things are a little bit complicated.
1598 * The parent must have a complete element type, such as
1599 * "i" or "aai" or "(ii)" or "a(ii)". There can't be
1600 * unclosed parens, or an "a" with no following type.
1602 * To recurse, the only allowed operation is to recurse into the
1603 * first type in the element type. So for "i" you can't recurse, for
1604 * "ai" you can recurse into the array, for "(ii)" you can recurse
1607 * If you recurse into the array for "ai", then you must specify
1608 * "i" for the element type of the array you recurse into.
1610 * While inside an array at any level, we need to avoid writing to
1611 * type_str, since the type only appears once for the whole array,
1612 * it does not appear for each array element.
1614 * While inside an array type_pos points to the expected next
1615 * typecode, rather than the next place we could write a typecode.
1618 writer_recurse_init_and_check (DBusTypeWriter *writer,
1620 DBusTypeWriter *sub)
1622 _dbus_type_writer_init (sub,
1629 sub->container_type = container_type;
1631 if (writer->type_pos_is_expectation ||
1632 (sub->container_type == DBUS_TYPE_ARRAY || sub->container_type == DBUS_TYPE_VARIANT))
1633 sub->type_pos_is_expectation = TRUE;
1635 sub->type_pos_is_expectation = FALSE;
1637 sub->enabled = writer->enabled;
1639 #ifndef DBUS_DISABLE_CHECKS
1640 if (writer->type_pos_is_expectation && writer->type_str)
1644 expected = _dbus_first_type_in_signature (writer->type_str, writer->type_pos);
1646 if (expected != sub->container_type)
1648 if (expected != DBUS_TYPE_INVALID)
1649 _dbus_warn_check_failed ("Writing an element of type %s, but the expected type here is %s\n"
1650 "The overall signature expected here was '%s' and we are on byte %d of that signature.\n",
1651 _dbus_type_to_string (sub->container_type),
1652 _dbus_type_to_string (expected),
1653 _dbus_string_get_const_data (writer->type_str), writer->type_pos);
1655 _dbus_warn_check_failed ("Writing an element of type %s, but no value is expected here\n",
1656 "The overall signature expected here was '%s' and we are on byte %d of that signature.\n",
1657 _dbus_type_to_string (sub->container_type),
1658 _dbus_string_get_const_data (writer->type_str), writer->type_pos);
1660 _dbus_assert_not_reached ("bad array element or variant content written");
1663 #endif /* DBUS_DISABLE_CHECKS */
1665 #if RECURSIVE_MARSHAL_WRITE_TRACE
1666 _dbus_verbose (" type writer %p recurse parent %s type_pos = %d value_pos = %d is_expectation = %d remaining sig '%s' enabled = %d\n",
1668 _dbus_type_to_string (writer->container_type),
1669 writer->type_pos, writer->value_pos, writer->type_pos_is_expectation,
1671 _dbus_string_get_const_data_len (writer->type_str, writer->type_pos, 0) :
1674 _dbus_verbose (" type writer %p recurse sub %s type_pos = %d value_pos = %d is_expectation = %d enabled = %d\n",
1676 _dbus_type_to_string (sub->container_type),
1677 sub->type_pos, sub->value_pos,
1678 sub->type_pos_is_expectation,
1684 write_or_verify_typecode (DBusTypeWriter *writer,
1687 /* A subwriter inside an array or variant will have type_pos
1688 * pointing to the expected typecode; a writer not inside an array
1689 * or variant has type_pos pointing to the next place to insert a
1692 #if RECURSIVE_MARSHAL_WRITE_TRACE
1693 _dbus_verbose (" type writer %p write_or_verify start type_pos = %d remaining sig '%s' enabled = %d\n",
1694 writer, writer->type_pos,
1696 _dbus_string_get_const_data_len (writer->type_str, writer->type_pos, 0) :
1701 if (writer->type_str == NULL)
1704 if (writer->type_pos_is_expectation)
1706 #ifndef DBUS_DISABLE_CHECKS
1710 expected = _dbus_string_get_byte (writer->type_str, writer->type_pos);
1712 if (expected != typecode)
1714 if (expected != DBUS_TYPE_INVALID)
1715 _dbus_warn_check_failed ("Array or variant type requires that type %s be written, but %s was written.\n"
1716 "The overall signature expected here was '%s' and we are on byte %d of that signature.\n",
1717 _dbus_type_to_string (expected), _dbus_type_to_string (typecode),
1718 _dbus_string_get_const_data (writer->type_str), writer->type_pos);
1720 _dbus_warn_check_failed ("Array or variant type wasn't expecting any more values to be written into it, but a value %s was written.\n"
1721 "The overall signature expected here was '%s' and we are on byte %d of that signature.\n",
1722 _dbus_type_to_string (typecode),
1723 _dbus_string_get_const_data (writer->type_str), writer->type_pos);
1724 _dbus_assert_not_reached ("bad type inserted somewhere inside an array or variant");
1727 #endif /* DBUS_DISABLE_CHECKS */
1729 /* if immediately inside an array we'd always be appending an element,
1730 * so the expected type doesn't change; if inside a struct or something
1731 * below an array, we need to move through said struct or something.
1733 if (writer->container_type != DBUS_TYPE_ARRAY)
1734 writer->type_pos += 1;
1738 if (!_dbus_string_insert_byte (writer->type_str,
1743 writer->type_pos += 1;
1746 #if RECURSIVE_MARSHAL_WRITE_TRACE
1747 _dbus_verbose (" type writer %p write_or_verify end type_pos = %d remaining sig '%s'\n",
1748 writer, writer->type_pos,
1749 _dbus_string_get_const_data_len (writer->type_str, writer->type_pos, 0));
1756 writer_recurse_struct_or_dict_entry (DBusTypeWriter *writer,
1758 const DBusString *contained_type,
1759 int contained_type_start,
1760 int contained_type_len,
1761 DBusTypeWriter *sub)
1763 /* FIXME right now contained_type is ignored; we could probably
1764 * almost trivially fix the code so if it's present we
1765 * write it out and then set type_pos_is_expectation
1768 /* Ensure that we'll be able to add alignment padding and the typecode */
1769 if (writer->enabled)
1771 if (!_dbus_string_alloc_space (sub->value_str, 8))
1775 if (!write_or_verify_typecode (sub, begin_char))
1776 _dbus_assert_not_reached ("failed to insert struct typecode after prealloc");
1778 if (writer->enabled)
1780 if (!_dbus_string_insert_bytes (sub->value_str,
1782 _DBUS_ALIGN_VALUE (sub->value_pos, 8) - sub->value_pos,
1784 _dbus_assert_not_reached ("should not have failed to insert alignment padding for struct");
1785 sub->value_pos = _DBUS_ALIGN_VALUE (sub->value_pos, 8);
1793 writer_recurse_array (DBusTypeWriter *writer,
1794 const DBusString *contained_type,
1795 int contained_type_start,
1796 int contained_type_len,
1797 DBusTypeWriter *sub,
1798 dbus_bool_t is_array_append)
1800 dbus_uint32_t value = 0;
1804 #ifndef DBUS_DISABLE_CHECKS
1805 if (writer->container_type == DBUS_TYPE_ARRAY &&
1808 if (!_dbus_string_equal_substring (contained_type,
1809 contained_type_start,
1812 writer->u.array.element_type_pos + 1))
1814 _dbus_warn_check_failed ("Writing an array of '%s' but this is incompatible with the expected type of elements in the parent array\n",
1815 _dbus_string_get_const_data_len (contained_type,
1816 contained_type_start,
1817 contained_type_len));
1818 _dbus_assert_not_reached ("incompatible type for child array");
1821 #endif /* DBUS_DISABLE_CHECKS */
1823 if (writer->enabled && !is_array_append)
1825 /* 3 pad + 4 bytes for the array length, and 4 bytes possible padding
1826 * before array values
1828 if (!_dbus_string_alloc_space (sub->value_str, 3 + 4 + 4))
1832 if (writer->type_str != NULL)
1834 sub->type_pos += 1; /* move to point to the element type, since type_pos
1835 * should be the expected type for further writes
1837 sub->u.array.element_type_pos = sub->type_pos;
1840 if (!writer->type_pos_is_expectation)
1842 /* sub is a toplevel/outermost array so we need to write the type data */
1844 /* alloc space for array typecode, element signature */
1845 if (!_dbus_string_alloc_space (writer->type_str, 1 + contained_type_len))
1848 if (!_dbus_string_insert_byte (writer->type_str,
1851 _dbus_assert_not_reached ("failed to insert array typecode after prealloc");
1853 if (!_dbus_string_copy_len (contained_type,
1854 contained_type_start, contained_type_len,
1856 sub->u.array.element_type_pos))
1857 _dbus_assert_not_reached ("should not have failed to insert array element typecodes");
1860 if (writer->type_str != NULL)
1862 /* If the parent is an array, we hold type_pos pointing at the array element type;
1863 * otherwise advance it to reflect the array value we just recursed into
1865 if (writer->container_type != DBUS_TYPE_ARRAY)
1866 writer->type_pos += 1 + contained_type_len;
1868 _dbus_assert (writer->type_pos_is_expectation); /* because it's an array */
1871 if (writer->enabled)
1873 /* Write (or jump over, if is_array_append) the length */
1874 sub->u.array.len_pos = _DBUS_ALIGN_VALUE (sub->value_pos, 4);
1876 if (is_array_append)
1878 sub->value_pos += 4;
1882 if (!_dbus_type_writer_write_basic_no_typecode (sub, DBUS_TYPE_UINT32,
1884 _dbus_assert_not_reached ("should not have failed to insert array len");
1887 _dbus_assert (sub->u.array.len_pos == sub->value_pos - 4);
1889 /* Write alignment padding for array elements
1890 * Note that we write the padding *even for empty arrays*
1891 * to avoid wonky special cases
1893 alignment = element_type_get_alignment (contained_type, contained_type_start);
1895 aligned = _DBUS_ALIGN_VALUE (sub->value_pos, alignment);
1896 if (aligned != sub->value_pos)
1898 if (!is_array_append)
1900 if (!_dbus_string_insert_bytes (sub->value_str,
1902 aligned - sub->value_pos,
1904 _dbus_assert_not_reached ("should not have failed to insert alignment padding");
1907 sub->value_pos = aligned;
1910 sub->u.array.start_pos = sub->value_pos;
1912 if (is_array_append)
1916 _dbus_assert (_DBUS_ALIGN_VALUE (sub->u.array.len_pos, 4) ==
1917 (unsigned) sub->u.array.len_pos);
1918 len = _dbus_unpack_uint32 (sub->byte_order,
1919 _dbus_string_get_const_data_len (sub->value_str,
1920 sub->u.array.len_pos,
1923 sub->value_pos += len;
1928 /* not enabled, so we won't write the len_pos; set it to -1 to so indicate */
1929 sub->u.array.len_pos = -1;
1930 sub->u.array.start_pos = sub->value_pos;
1933 _dbus_assert (sub->u.array.len_pos < sub->u.array.start_pos);
1934 _dbus_assert (is_array_append || sub->u.array.start_pos == sub->value_pos);
1936 #if RECURSIVE_MARSHAL_WRITE_TRACE
1937 _dbus_verbose (" type writer %p recurse array done remaining sig '%s' array start_pos = %d len_pos = %d value_pos = %d\n", sub,
1939 _dbus_string_get_const_data_len (sub->type_str, sub->type_pos, 0) :
1941 sub->u.array.start_pos, sub->u.array.len_pos, sub->value_pos);
1947 /* Variant value will normally have:
1948 * 1 byte signature length not including nul
1949 * signature typecodes (nul terminated)
1950 * padding to alignment of contained type
1951 * body according to signature
1953 * The signature string can only have a single type
1954 * in it but that type may be complex/recursive.
1956 * So a typical variant type with the integer 3 will have these
1958 * 0x1 'i' '\0' [1 byte padding to alignment boundary] 0x0 0x0 0x0 0x3
1960 * The main world of hurt for writing out a variant is that the type
1961 * string is the same string as the value string. Which means
1962 * inserting to the type string will move the value_pos; and it means
1963 * that inserting to the type string could break type alignment.
1966 writer_recurse_variant (DBusTypeWriter *writer,
1967 const DBusString *contained_type,
1968 int contained_type_start,
1969 int contained_type_len,
1970 DBusTypeWriter *sub)
1972 int contained_alignment;
1974 if (writer->enabled)
1976 /* Allocate space for the worst case, which is 1 byte sig
1977 * length, nul byte at end of sig, and 7 bytes padding to
1980 if (!_dbus_string_alloc_space (sub->value_str, contained_type_len + 9))
1984 /* write VARIANT typecode to the parent's type string */
1985 if (!write_or_verify_typecode (writer, DBUS_TYPE_VARIANT))
1988 /* If not enabled, mark that we have no type_str anymore ... */
1990 if (!writer->enabled)
1992 sub->type_str = NULL;
1998 /* If we're enabled then continue ... */
2000 if (!_dbus_string_insert_byte (sub->value_str,
2002 contained_type_len))
2003 _dbus_assert_not_reached ("should not have failed to insert variant type sig len");
2005 sub->value_pos += 1;
2007 /* Here we switch over to the expected type sig we're about to write */
2008 sub->type_str = sub->value_str;
2009 sub->type_pos = sub->value_pos;
2011 if (!_dbus_string_copy_len (contained_type, contained_type_start, contained_type_len,
2012 sub->value_str, sub->value_pos))
2013 _dbus_assert_not_reached ("should not have failed to insert variant type sig");
2015 sub->value_pos += contained_type_len;
2017 if (!_dbus_string_insert_byte (sub->value_str,
2020 _dbus_assert_not_reached ("should not have failed to insert variant type nul termination");
2022 sub->value_pos += 1;
2024 contained_alignment = _dbus_type_get_alignment (_dbus_first_type_in_signature (contained_type, contained_type_start));
2026 if (!_dbus_string_insert_bytes (sub->value_str,
2028 _DBUS_ALIGN_VALUE (sub->value_pos, contained_alignment) - sub->value_pos,
2030 _dbus_assert_not_reached ("should not have failed to insert alignment padding for variant body");
2031 sub->value_pos = _DBUS_ALIGN_VALUE (sub->value_pos, contained_alignment);
2037 _dbus_type_writer_recurse_contained_len (DBusTypeWriter *writer,
2039 const DBusString *contained_type,
2040 int contained_type_start,
2041 int contained_type_len,
2042 DBusTypeWriter *sub,
2043 dbus_bool_t is_array_append)
2045 writer_recurse_init_and_check (writer, container_type, sub);
2047 switch (container_type)
2049 case DBUS_TYPE_STRUCT:
2050 return writer_recurse_struct_or_dict_entry (writer,
2051 DBUS_STRUCT_BEGIN_CHAR,
2053 contained_type_start, contained_type_len,
2056 case DBUS_TYPE_DICT_ENTRY:
2057 return writer_recurse_struct_or_dict_entry (writer,
2058 DBUS_DICT_ENTRY_BEGIN_CHAR,
2060 contained_type_start, contained_type_len,
2063 case DBUS_TYPE_ARRAY:
2064 return writer_recurse_array (writer,
2065 contained_type, contained_type_start, contained_type_len,
2066 sub, is_array_append);
2068 case DBUS_TYPE_VARIANT:
2069 return writer_recurse_variant (writer,
2070 contained_type, contained_type_start, contained_type_len,
2074 _dbus_assert_not_reached ("tried to recurse into type that doesn't support that");
2081 * Opens a new container and writes out the initial information for that container.
2083 * @param writer the writer
2084 * @param container_type the type of the container to open
2085 * @param contained_type the array element type or variant content type
2086 * @param contained_type_start position to look for the type
2087 * @param sub the new sub-writer to write container contents
2088 * @returns #FALSE if no memory
2091 _dbus_type_writer_recurse (DBusTypeWriter *writer,
2093 const DBusString *contained_type,
2094 int contained_type_start,
2095 DBusTypeWriter *sub)
2097 int contained_type_len;
2100 contained_type_len = find_len_of_complete_type (contained_type, contained_type_start);
2102 contained_type_len = 0;
2104 return _dbus_type_writer_recurse_contained_len (writer, container_type,
2106 contained_type_start,
2113 * Append to an existing array. Essentially, the writer will read an
2114 * existing length at the write location; jump over that length; and
2115 * write new fields. On unrecurse(), the existing length will be
2118 * @param writer the writer
2119 * @param contained_type element type
2120 * @param contained_type_start position of element type
2121 * @param sub the subwriter to init
2122 * @returns #FALSE if no memory
2125 _dbus_type_writer_append_array (DBusTypeWriter *writer,
2126 const DBusString *contained_type,
2127 int contained_type_start,
2128 DBusTypeWriter *sub)
2130 int contained_type_len;
2133 contained_type_len = find_len_of_complete_type (contained_type, contained_type_start);
2135 contained_type_len = 0;
2137 return _dbus_type_writer_recurse_contained_len (writer, DBUS_TYPE_ARRAY,
2139 contained_type_start,
2146 writer_get_array_len (DBusTypeWriter *writer)
2148 _dbus_assert (writer->container_type == DBUS_TYPE_ARRAY);
2149 return writer->value_pos - writer->u.array.start_pos;
2153 * Closes a container created by _dbus_type_writer_recurse()
2154 * and writes any additional information to the values block.
2156 * @param writer the writer
2157 * @param sub the sub-writer created by _dbus_type_writer_recurse()
2158 * @returns #FALSE if no memory
2161 _dbus_type_writer_unrecurse (DBusTypeWriter *writer,
2162 DBusTypeWriter *sub)
2164 /* type_pos_is_expectation never gets unset once set, or we'd get all hosed */
2165 _dbus_assert (!writer->type_pos_is_expectation ||
2166 (writer->type_pos_is_expectation && sub->type_pos_is_expectation));
2168 #if RECURSIVE_MARSHAL_WRITE_TRACE
2169 _dbus_verbose (" type writer %p unrecurse type_pos = %d value_pos = %d is_expectation = %d container_type = %s\n",
2170 writer, writer->type_pos, writer->value_pos, writer->type_pos_is_expectation,
2171 _dbus_type_to_string (writer->container_type));
2172 _dbus_verbose (" type writer %p unrecurse sub type_pos = %d value_pos = %d is_expectation = %d container_type = %s\n",
2173 sub, sub->type_pos, sub->value_pos,
2174 sub->type_pos_is_expectation,
2175 _dbus_type_to_string (sub->container_type));
2178 if (sub->container_type == DBUS_TYPE_STRUCT)
2180 if (!write_or_verify_typecode (sub, DBUS_STRUCT_END_CHAR))
2183 else if (sub->container_type == DBUS_TYPE_DICT_ENTRY)
2185 if (!write_or_verify_typecode (sub, DBUS_DICT_ENTRY_END_CHAR))
2188 else if (sub->container_type == DBUS_TYPE_ARRAY)
2190 if (sub->u.array.len_pos >= 0) /* len_pos == -1 if we weren't enabled when we passed it */
2194 /* Set the array length */
2195 len = writer_get_array_len (sub);
2196 _dbus_marshal_set_uint32 (sub->value_str,
2197 sub->u.array.len_pos,
2200 #if RECURSIVE_MARSHAL_WRITE_TRACE
2201 _dbus_verbose (" filled in sub array len to %u at len_pos %d\n",
2202 len, sub->u.array.len_pos);
2205 #if RECURSIVE_MARSHAL_WRITE_TRACE
2208 _dbus_verbose (" not filling in sub array len because we were disabled when we passed the len\n");
2213 /* Now get type_pos right for the parent writer. Here are the cases:
2215 * Cases !writer->type_pos_is_expectation:
2216 * (in these cases we want to update to the new insertion point)
2218 * - if we recursed into a STRUCT then we didn't know in advance
2219 * what the types in the struct would be; so we have to fill in
2220 * that information now.
2221 * writer->type_pos = sub->type_pos
2223 * - if we recursed into anything else, we knew the full array
2224 * type, or knew the single typecode marking VARIANT, so
2225 * writer->type_pos is already correct.
2226 * writer->type_pos should remain as-is
2228 * - note that the parent is never an ARRAY or VARIANT, if it were
2229 * then type_pos_is_expectation would be TRUE. The parent
2230 * is thus known to be a toplevel or STRUCT.
2232 * Cases where writer->type_pos_is_expectation:
2233 * (in these cases we want to update to next expected type to write)
2235 * - we recursed from STRUCT into STRUCT and we didn't increment
2236 * type_pos in the parent just to stay consistent with the
2237 * !writer->type_pos_is_expectation case (though we could
2238 * special-case this in recurse_struct instead if we wanted)
2239 * writer->type_pos = sub->type_pos
2241 * - we recursed from STRUCT into ARRAY or VARIANT and type_pos
2242 * for parent should have been incremented already
2243 * writer->type_pos should remain as-is
2245 * - we recursed from ARRAY into a sub-element, so type_pos in the
2246 * parent is the element type and should remain the element type
2247 * for the benefit of the next child element
2248 * writer->type_pos should remain as-is
2250 * - we recursed from VARIANT into its value, so type_pos in the
2251 * parent makes no difference since there's only one value
2252 * and we just finished writing it and won't use type_pos again
2253 * writer->type_pos should remain as-is
2256 * For all these, DICT_ENTRY is the same as STRUCT
2258 if (writer->type_str != NULL)
2260 if ((sub->container_type == DBUS_TYPE_STRUCT ||
2261 sub->container_type == DBUS_TYPE_DICT_ENTRY) &&
2262 (writer->container_type == DBUS_TYPE_STRUCT ||
2263 writer->container_type == DBUS_TYPE_DICT_ENTRY ||
2264 writer->container_type == DBUS_TYPE_INVALID))
2266 /* Advance the parent to the next struct field */
2267 writer->type_pos = sub->type_pos;
2271 writer->value_pos = sub->value_pos;
2273 #if RECURSIVE_MARSHAL_WRITE_TRACE
2274 _dbus_verbose (" type writer %p unrecursed type_pos = %d value_pos = %d remaining sig '%s'\n",
2275 writer, writer->type_pos, writer->value_pos,
2277 _dbus_string_get_const_data_len (writer->type_str, writer->type_pos, 0) :
2285 * Writes out a basic type.
2287 * @param writer the writer
2288 * @param type the type to write
2289 * @param value the address of the value to write
2290 * @returns #FALSE if no memory
2293 _dbus_type_writer_write_basic (DBusTypeWriter *writer,
2299 /* First ensure that our type realloc will succeed */
2300 if (!writer->type_pos_is_expectation && writer->type_str != NULL)
2302 if (!_dbus_string_alloc_space (writer->type_str, 1))
2308 if (!_dbus_type_writer_write_basic_no_typecode (writer, type, value))
2311 if (!write_or_verify_typecode (writer, type))
2312 _dbus_assert_not_reached ("failed to write typecode after prealloc");
2317 #if RECURSIVE_MARSHAL_WRITE_TRACE
2318 _dbus_verbose (" type writer %p basic type_pos = %d value_pos = %d is_expectation = %d enabled = %d\n",
2319 writer, writer->type_pos, writer->value_pos, writer->type_pos_is_expectation,
2327 * Writes a block of fixed-length basic values, i.e. those that are
2328 * both dbus_type_is_fixed() and _dbus_type_is_basic(). The block
2329 * must be written inside an array.
2331 * The value parameter should be the address of said array of values,
2332 * so e.g. if it's an array of double, pass in "const double**"
2334 * @param writer the writer
2335 * @param element_type type of stuff in the array
2336 * @param value address of the array
2337 * @param n_elements number of elements in the array
2338 * @returns #FALSE if no memory
2341 _dbus_type_writer_write_fixed_multi (DBusTypeWriter *writer,
2346 _dbus_assert (writer->container_type == DBUS_TYPE_ARRAY);
2347 _dbus_assert (dbus_type_is_fixed (element_type));
2348 _dbus_assert (writer->type_pos_is_expectation);
2349 _dbus_assert (n_elements >= 0);
2351 #if RECURSIVE_MARSHAL_WRITE_TRACE
2352 _dbus_verbose (" type writer %p entering fixed multi type_pos = %d value_pos = %d n_elements %d\n",
2353 writer, writer->type_pos, writer->value_pos, n_elements);
2356 if (!write_or_verify_typecode (writer, element_type))
2357 _dbus_assert_not_reached ("OOM should not happen if only verifying typecode");
2359 if (writer->enabled)
2361 if (!_dbus_marshal_write_fixed_multi (writer->value_str,
2367 &writer->value_pos))
2371 #if RECURSIVE_MARSHAL_WRITE_TRACE
2372 _dbus_verbose (" type writer %p fixed multi written new type_pos = %d new value_pos = %d n_elements %d\n",
2373 writer, writer->type_pos, writer->value_pos, n_elements);
2380 enable_if_after (DBusTypeWriter *writer,
2381 DBusTypeReader *reader,
2382 const DBusTypeReader *start_after)
2386 if (!writer->enabled && _dbus_type_reader_greater_than (reader, start_after))
2388 _dbus_type_writer_set_enabled (writer, TRUE);
2389 #if RECURSIVE_MARSHAL_WRITE_TRACE
2390 _dbus_verbose ("ENABLING writer %p at %d because reader at value_pos %d is after reader at value_pos %d\n",
2391 writer, writer->value_pos, reader->value_pos, start_after->value_pos);
2395 _dbus_assert ((!writer->enabled && !_dbus_type_reader_greater_than (reader, start_after)) ||
2396 (writer->enabled && _dbus_type_reader_greater_than (reader, start_after)));
2401 append_fixup (DBusList **fixups,
2402 const DBusArrayLenFixup *fixup)
2404 DBusArrayLenFixup *f;
2406 f = dbus_new (DBusArrayLenFixup, 1);
2412 if (!_dbus_list_append (fixups, f))
2418 _dbus_assert (f->len_pos_in_reader == fixup->len_pos_in_reader);
2419 _dbus_assert (f->new_len == fixup->new_len);
2424 /* This loop is trivial if you ignore all the start_after nonsense,
2425 * so if you're trying to figure it out, start by ignoring that
2428 writer_write_reader_helper (DBusTypeWriter *writer,
2429 DBusTypeReader *reader,
2430 const DBusTypeReader *start_after,
2431 int start_after_new_pos,
2432 int start_after_new_len,
2434 dbus_bool_t inside_start_after)
2438 while ((current_type = _dbus_type_reader_get_current_type (reader)) != DBUS_TYPE_INVALID)
2440 if (dbus_type_is_container (current_type))
2442 DBusTypeReader subreader;
2443 DBusTypeWriter subwriter;
2444 const DBusString *sig_str;
2447 dbus_bool_t enabled_at_recurse;
2448 dbus_bool_t past_start_after;
2449 int reader_array_len_pos;
2450 int reader_array_start_pos;
2451 dbus_bool_t this_is_start_after;
2453 /* type_pos is checked since e.g. in a struct the struct
2454 * and its first field have the same value_pos.
2455 * type_str will differ in reader/start_after for variants
2456 * where type_str is inside the value_str
2458 if (!inside_start_after && start_after &&
2459 reader->value_pos == start_after->value_pos &&
2460 reader->type_str == start_after->type_str &&
2461 reader->type_pos == start_after->type_pos)
2462 this_is_start_after = TRUE;
2464 this_is_start_after = FALSE;
2466 _dbus_type_reader_recurse (reader, &subreader);
2468 if (current_type == DBUS_TYPE_ARRAY)
2470 reader_array_len_pos = ARRAY_READER_LEN_POS (&subreader);
2471 reader_array_start_pos = subreader.u.array.start_pos;
2476 reader_array_len_pos = -1;
2477 reader_array_start_pos = -1;
2480 _dbus_type_reader_get_signature (&subreader, &sig_str,
2481 &sig_start, &sig_len);
2483 #if RECURSIVE_MARSHAL_WRITE_TRACE
2484 _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",
2485 _dbus_type_to_string (current_type),
2487 subreader.value_pos,
2489 start_after ? start_after->value_pos : -1,
2490 _dbus_string_get_length (writer->value_str),
2491 inside_start_after, this_is_start_after);
2494 if (!inside_start_after && !this_is_start_after)
2495 enable_if_after (writer, &subreader, start_after);
2496 enabled_at_recurse = writer->enabled;
2497 if (!_dbus_type_writer_recurse_contained_len (writer, current_type,
2498 sig_str, sig_start, sig_len,
2502 #if RECURSIVE_MARSHAL_WRITE_TRACE
2503 _dbus_verbose ("recursed into subwriter at %d write target len %d\n",
2504 subwriter.value_pos,
2505 _dbus_string_get_length (subwriter.value_str));
2508 if (!writer_write_reader_helper (&subwriter, &subreader, start_after,
2509 start_after_new_pos, start_after_new_len,
2511 inside_start_after ||
2512 this_is_start_after))
2515 #if RECURSIVE_MARSHAL_WRITE_TRACE
2516 _dbus_verbose ("about to unrecurse from %s subreader at %d writer at %d subwriter at %d write target len %d\n",
2517 _dbus_type_to_string (current_type),
2518 subreader.value_pos,
2520 subwriter.value_pos,
2521 _dbus_string_get_length (writer->value_str));
2524 if (!inside_start_after && !this_is_start_after)
2525 enable_if_after (writer, &subreader, start_after);
2526 past_start_after = writer->enabled;
2527 if (!_dbus_type_writer_unrecurse (writer, &subwriter))
2530 /* If we weren't enabled when we recursed, we didn't
2531 * write an array len; if we passed start_after
2532 * somewhere inside the array, then we need to generate
2535 if (start_after != NULL &&
2536 !enabled_at_recurse && past_start_after &&
2537 current_type == DBUS_TYPE_ARRAY &&
2540 DBusArrayLenFixup fixup;
2541 int bytes_written_after_start_after;
2542 int bytes_before_start_after;
2545 /* this subwriter access is moderately unkosher since we
2546 * already unrecursed, but it works as long as unrecurse
2547 * doesn't break us on purpose
2549 bytes_written_after_start_after = writer_get_array_len (&subwriter);
2551 bytes_before_start_after =
2552 start_after->value_pos - reader_array_start_pos;
2554 fixup.len_pos_in_reader = reader_array_len_pos;
2556 bytes_before_start_after +
2557 start_after_new_len +
2558 bytes_written_after_start_after;
2560 _dbus_assert (_DBUS_ALIGN_VALUE (fixup.len_pos_in_reader, 4) ==
2561 (unsigned) fixup.len_pos_in_reader);
2563 old_len = _dbus_unpack_uint32 (reader->byte_order,
2564 _dbus_string_get_const_data_len (reader->value_str,
2565 fixup.len_pos_in_reader, 4));
2567 if (old_len != fixup.new_len && !append_fixup (fixups, &fixup))
2570 #if RECURSIVE_MARSHAL_WRITE_TRACE
2571 _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",
2572 fixup.len_pos_in_reader,
2574 reader_array_start_pos,
2575 start_after->value_pos,
2576 bytes_before_start_after,
2577 start_after_new_len,
2578 bytes_written_after_start_after);
2586 _dbus_assert (dbus_type_is_basic (current_type));
2588 #if RECURSIVE_MARSHAL_WRITE_TRACE
2589 _dbus_verbose ("Reading basic value %s at %d\n",
2590 _dbus_type_to_string (current_type),
2594 _dbus_type_reader_read_basic (reader, &val);
2596 #if RECURSIVE_MARSHAL_WRITE_TRACE
2597 _dbus_verbose ("Writing basic value %s at %d write target len %d inside_start_after = %d\n",
2598 _dbus_type_to_string (current_type),
2600 _dbus_string_get_length (writer->value_str),
2601 inside_start_after);
2603 if (!inside_start_after)
2604 enable_if_after (writer, reader, start_after);
2605 if (!_dbus_type_writer_write_basic (writer, current_type, &val))
2607 #if RECURSIVE_MARSHAL_WRITE_TRACE
2608 _dbus_verbose ("Wrote basic value %s, new value_pos %d write target len %d\n",
2609 _dbus_type_to_string (current_type),
2611 _dbus_string_get_length (writer->value_str));
2615 _dbus_type_reader_next (reader);
2622 apply_and_free_fixups (fixups, NULL); /* NULL for reader to apply to */
2628 * Iterate through all values in the given reader, writing a copy of
2629 * each value to the writer. The reader will be moved forward to its
2632 * If a reader start_after is provided, it should be a reader for the
2633 * same data as the reader to be written. Only values occurring after
2634 * the value pointed to by start_after will be written to the writer.
2636 * If start_after is provided, then the copy of the reader will be
2637 * partial. This means that array lengths will not have been copied.
2638 * The assumption is that you wrote a new version of the value at
2639 * start_after to the writer. You have to pass in the start position
2640 * and length of the new value. (If you are deleting the value
2641 * at start_after, pass in 0 for the length.)
2643 * If the fixups parameter is non-#NULL, then any array length that
2644 * was read but not written due to start_after will be provided
2645 * as a #DBusArrayLenFixup. The fixup contains the position of the
2646 * array length in the source data, and the correct array length
2647 * assuming you combine the source data before start_after with
2648 * the written data at start_after and beyond.
2650 * @param writer the writer to copy to
2651 * @param reader the reader to copy from
2652 * @param start_after #NULL or a reader showing where to start
2653 * @param start_after_new_pos the position of start_after equivalent in the target data
2654 * @param start_after_new_len the length of start_after equivalent in the target data
2655 * @param fixups list to append #DBusArrayLenFixup if the write was partial
2656 * @returns #FALSE if no memory
2659 _dbus_type_writer_write_reader_partial (DBusTypeWriter *writer,
2660 DBusTypeReader *reader,
2661 const DBusTypeReader *start_after,
2662 int start_after_new_pos,
2663 int start_after_new_len,
2666 DBusTypeWriter orig;
2673 orig_type_len = _dbus_string_get_length (writer->type_str);
2674 orig_value_len = _dbus_string_get_length (writer->value_str);
2675 orig_enabled = writer->enabled;
2678 _dbus_type_writer_set_enabled (writer, FALSE);
2680 if (!writer_write_reader_helper (writer, reader, start_after,
2681 start_after_new_pos,
2682 start_after_new_len,
2686 _dbus_type_writer_set_enabled (writer, orig_enabled);
2690 if (!writer->type_pos_is_expectation)
2692 new_bytes = _dbus_string_get_length (writer->type_str) - orig_type_len;
2693 _dbus_string_delete (writer->type_str, orig.type_pos, new_bytes);
2695 new_bytes = _dbus_string_get_length (writer->value_str) - orig_value_len;
2696 _dbus_string_delete (writer->value_str, orig.value_pos, new_bytes);
2704 * Iterate through all values in the given reader, writing a copy of
2705 * each value to the writer. The reader will be moved forward to its
2708 * @param writer the writer to copy to
2709 * @param reader the reader to copy from
2710 * @returns #FALSE if no memory
2713 _dbus_type_writer_write_reader (DBusTypeWriter *writer,
2714 DBusTypeReader *reader)
2716 return _dbus_type_writer_write_reader_partial (writer, reader, NULL, 0, 0, NULL);
2720 * If disabled, a writer can still be iterated forward and recursed/unrecursed
2721 * but won't write any values. Types will still be written unless the
2722 * writer is a "values only" writer, because the writer needs access to
2723 * a valid signature to be able to iterate.
2725 * @param writer the type writer
2726 * @param enabled #TRUE if values should be written
2729 _dbus_type_writer_set_enabled (DBusTypeWriter *writer,
2730 dbus_bool_t enabled)
2732 writer->enabled = enabled != FALSE;
2735 /** @} */ /* end of DBusMarshal group */
2737 /* tests in dbus-marshal-recursive-util.c */