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 #ifndef DBUS_DISABLE_ASSERT
694 static const DBusTypeReaderClass * const
695 all_reader_classes[] = {
697 &body_types_only_reader_class,
698 &struct_reader_class,
699 &struct_types_only_reader_class,
700 &dict_entry_reader_class,
701 &dict_entry_types_only_reader_class,
703 &array_types_only_reader_class,
704 &variant_reader_class
709 * Initializes a type reader.
711 * @param reader the reader
712 * @param byte_order the byte order of the block to read
713 * @param type_str the signature of the block to read
714 * @param type_pos location of signature
715 * @param value_str the string containing values block
716 * @param value_pos start of values block
719 _dbus_type_reader_init (DBusTypeReader *reader,
721 const DBusString *type_str,
723 const DBusString *value_str,
726 reader->klass = &body_reader_class;
728 reader_init (reader, byte_order, type_str, type_pos,
729 value_str, value_pos);
731 #if RECURSIVE_MARSHAL_READ_TRACE
732 _dbus_verbose (" type reader %p init type_pos = %d value_pos = %d remaining sig '%s'\n",
733 reader, reader->type_pos, reader->value_pos,
734 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0));
739 * Like _dbus_type_reader_init() but the iteration is over the
740 * signature, not over values.
742 * @param reader the reader
743 * @param type_str the signature string
744 * @param type_pos location in the signature string
747 _dbus_type_reader_init_types_only (DBusTypeReader *reader,
748 const DBusString *type_str,
751 reader->klass = &body_types_only_reader_class;
753 reader_init (reader, DBUS_COMPILER_BYTE_ORDER /* irrelevant */,
754 type_str, type_pos, NULL, _DBUS_INT_MAX /* crashes if we screw up */);
756 #if RECURSIVE_MARSHAL_READ_TRACE
757 _dbus_verbose (" type reader %p init types only type_pos = %d remaining sig '%s'\n",
758 reader, reader->type_pos,
759 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0));
764 * Gets the type of the value the reader is currently pointing to;
765 * or for a types-only reader gets the type it's currently pointing to.
766 * If the reader is at the end of a block or end of a container such
767 * as an array, returns #DBUS_TYPE_INVALID.
769 * @param reader the reader
772 _dbus_type_reader_get_current_type (const DBusTypeReader *reader)
776 if (reader->finished ||
777 (reader->klass->check_finished &&
778 (* reader->klass->check_finished) (reader)))
779 t = DBUS_TYPE_INVALID;
781 t = _dbus_first_type_in_signature (reader->type_str,
784 _dbus_assert (t != DBUS_STRUCT_END_CHAR);
785 _dbus_assert (t != DBUS_STRUCT_BEGIN_CHAR);
786 _dbus_assert (t != DBUS_DICT_ENTRY_END_CHAR);
787 _dbus_assert (t != DBUS_DICT_ENTRY_BEGIN_CHAR);
790 _dbus_verbose (" type reader %p current type_pos = %d type = %s\n",
791 reader, reader->type_pos,
792 _dbus_type_to_string (t));
799 * Gets the type of an element of the array the reader is currently
800 * pointing to. It's an error to call this if
801 * _dbus_type_reader_get_current_type() doesn't return #DBUS_TYPE_ARRAY
804 * @param reader the reader
807 _dbus_type_reader_get_element_type (const DBusTypeReader *reader)
811 _dbus_assert (_dbus_type_reader_get_current_type (reader) == DBUS_TYPE_ARRAY);
813 element_type = _dbus_first_type_in_signature (reader->type_str,
814 reader->type_pos + 1);
820 * Gets the current position in the value block
821 * @param reader the reader
824 _dbus_type_reader_get_value_pos (const DBusTypeReader *reader)
826 return reader->value_pos;
830 * Get the address of the marshaled value in the data being read. The
831 * address may not be aligned; you have to align it to the type of the
832 * value you want to read. Most of the demarshal routines do this for
835 * @param reader the reader
836 * @param value_location the address of the marshaled value
839 _dbus_type_reader_read_raw (const DBusTypeReader *reader,
840 const unsigned char **value_location)
842 _dbus_assert (!reader->klass->types_only);
844 *value_location = _dbus_string_get_const_data_len (reader->value_str,
850 * Reads a basic-typed value, as with _dbus_marshal_read_basic().
852 * @param reader the reader
853 * @param value the address of the value
856 _dbus_type_reader_read_basic (const DBusTypeReader *reader,
861 _dbus_assert (!reader->klass->types_only);
863 t = _dbus_type_reader_get_current_type (reader);
865 _dbus_marshal_read_basic (reader->value_str,
872 #if RECURSIVE_MARSHAL_READ_TRACE
873 _dbus_verbose (" type reader %p read basic type_pos = %d value_pos = %d remaining sig '%s'\n",
874 reader, reader->type_pos, reader->value_pos,
875 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0));
880 * Returns the number of bytes in the array.
882 * @param reader the reader to read from
883 * @returns the number of bytes in the array
886 _dbus_type_reader_get_array_length (const DBusTypeReader *reader)
888 _dbus_assert (!reader->klass->types_only);
889 _dbus_assert (reader->klass == &array_reader_class);
891 return array_reader_get_array_len (reader);
895 * Reads a block of fixed-length basic values, from the current point
896 * in an array to the end of the array. Does not work for arrays of
897 * string or container types.
899 * This function returns the array in-place; it does not make a copy,
900 * and it does not swap the bytes.
902 * If you ask for #DBUS_TYPE_DOUBLE you will get a "const double*" back
903 * and the "value" argument should be a "const double**" and so on.
905 * @param reader the reader to read from
906 * @param value place to return the array values
907 * @param n_elements place to return number of array elements
910 _dbus_type_reader_read_fixed_multi (const DBusTypeReader *reader,
920 _dbus_assert (!reader->klass->types_only);
921 _dbus_assert (reader->klass == &array_reader_class);
923 element_type = _dbus_first_type_in_signature (reader->type_str,
926 _dbus_assert (element_type != DBUS_TYPE_INVALID); /* why we don't use get_current_type() */
927 _dbus_assert (dbus_type_is_fixed (element_type));
929 alignment = _dbus_type_get_alignment (element_type);
931 _dbus_assert (reader->value_pos >= reader->u.array.start_pos);
933 total_len = array_reader_get_array_len (reader);
934 end_pos = reader->u.array.start_pos + total_len;
935 remaining_len = end_pos - reader->value_pos;
937 #if RECURSIVE_MARSHAL_READ_TRACE
938 _dbus_verbose ("end_pos %d total_len %d remaining_len %d value_pos %d\n",
939 end_pos, total_len, remaining_len, reader->value_pos);
942 _dbus_assert (remaining_len <= total_len);
944 if (remaining_len == 0)
945 *(const DBusBasicValue**) value = NULL;
947 *(const DBusBasicValue**) value =
948 (void*) _dbus_string_get_const_data_len (reader->value_str,
952 *n_elements = remaining_len / alignment;
953 _dbus_assert ((remaining_len % alignment) == 0);
955 #if RECURSIVE_MARSHAL_READ_TRACE
956 _dbus_verbose (" type reader %p read fixed array type_pos = %d value_pos = %d remaining sig '%s'\n",
957 reader, reader->type_pos, reader->value_pos,
958 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0));
963 * Initialize a new reader pointing to the first type and
964 * corresponding value that's a child of the current container. It's
965 * an error to call this if the current type is a non-container.
967 * Note that DBusTypeReader traverses values, not types. So if you
968 * have an empty array of array of int, you can't recurse into it. You
969 * can only recurse into each element.
971 * @param reader the reader
972 * @param sub a reader to init pointing to the first child
975 _dbus_type_reader_recurse (DBusTypeReader *reader,
980 t = _dbus_first_type_in_signature (reader->type_str, reader->type_pos);
984 case DBUS_TYPE_STRUCT:
985 if (reader->klass->types_only)
986 sub->klass = &struct_types_only_reader_class;
988 sub->klass = &struct_reader_class;
990 case DBUS_TYPE_DICT_ENTRY:
991 if (reader->klass->types_only)
992 sub->klass = &dict_entry_types_only_reader_class;
994 sub->klass = &dict_entry_reader_class;
996 case DBUS_TYPE_ARRAY:
997 if (reader->klass->types_only)
998 sub->klass = &array_types_only_reader_class;
1000 sub->klass = &array_reader_class;
1002 case DBUS_TYPE_VARIANT:
1003 if (reader->klass->types_only)
1004 _dbus_assert_not_reached ("can't recurse into variant typecode");
1006 sub->klass = &variant_reader_class;
1009 _dbus_verbose ("recursing into type %s\n", _dbus_type_to_string (t));
1010 #ifndef DBUS_DISABLE_CHECKS
1011 if (t == DBUS_TYPE_INVALID)
1012 _dbus_warn_check_failed ("You can't recurse into an empty array or off the end of a message body\n");
1013 #endif /* DBUS_DISABLE_CHECKS */
1015 _dbus_assert_not_reached ("don't yet handle recursing into this type");
1018 _dbus_assert (sub->klass == all_reader_classes[sub->klass->id]);
1020 (* sub->klass->recurse) (sub, reader);
1022 #if RECURSIVE_MARSHAL_READ_TRACE
1023 _dbus_verbose (" type reader %p RECURSED type_pos = %d value_pos = %d remaining sig '%s'\n",
1024 sub, sub->type_pos, sub->value_pos,
1025 _dbus_string_get_const_data_len (sub->type_str, sub->type_pos, 0));
1030 * Skip to the next value on this "level". e.g. the next field in a
1031 * struct, the next value in an array. Returns FALSE at the end of the
1032 * current container.
1034 * @param reader the reader
1035 * @returns FALSE if nothing more to read at or below this level
1038 _dbus_type_reader_next (DBusTypeReader *reader)
1042 t = _dbus_type_reader_get_current_type (reader);
1044 #if RECURSIVE_MARSHAL_READ_TRACE
1045 _dbus_verbose (" type reader %p START next() { type_pos = %d value_pos = %d remaining sig '%s' current_type = %s\n",
1046 reader, reader->type_pos, reader->value_pos,
1047 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0),
1048 _dbus_type_to_string (t));
1051 if (t == DBUS_TYPE_INVALID)
1054 (* reader->klass->next) (reader, t);
1056 #if RECURSIVE_MARSHAL_READ_TRACE
1057 _dbus_verbose (" type reader %p END next() type_pos = %d value_pos = %d remaining sig '%s' current_type = %s\n",
1058 reader, reader->type_pos, reader->value_pos,
1059 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0),
1060 _dbus_type_to_string (_dbus_type_reader_get_current_type (reader)));
1063 return _dbus_type_reader_get_current_type (reader) != DBUS_TYPE_INVALID;
1067 * Check whether there's another value on this "level". e.g. the next
1068 * field in a struct, the next value in an array. Returns FALSE at the
1069 * end of the current container.
1071 * You probably don't want to use this; it makes for an awkward for/while
1072 * loop. A nicer one is "while ((current_type = get_current_type()) != INVALID)"
1074 * @param reader the reader
1075 * @returns FALSE if nothing more to read at or below this level
1078 _dbus_type_reader_has_next (const DBusTypeReader *reader)
1080 /* Not efficient but works for now. */
1081 DBusTypeReader copy;
1084 return _dbus_type_reader_next (©);
1088 * Gets the string and range of said string containing the signature
1089 * of the current value. Essentially a more complete version of
1090 * _dbus_type_reader_get_current_type() (returns the full type
1091 * rather than only the outside of the onion).
1093 * Note though that the first byte in a struct signature is
1094 * #DBUS_STRUCT_BEGIN_CHAR while the current type will be
1095 * #DBUS_TYPE_STRUCT so it isn't true that the first byte of the
1096 * signature is always the same as the current type. Another
1097 * difference is that this function will still return a signature when
1098 * inside an empty array; say you recurse into empty array of int32,
1099 * the signature is "i" but the current type will always be
1100 * #DBUS_TYPE_INVALID since there are no elements to be currently
1103 * @param reader the reader
1104 * @param str_p place to return the string with the type in it
1105 * @param start_p place to return start of the type
1106 * @param len_p place to return the length of the type
1109 _dbus_type_reader_get_signature (const DBusTypeReader *reader,
1110 const DBusString **str_p,
1114 *str_p = reader->type_str;
1115 *start_p = reader->type_pos;
1116 *len_p = find_len_of_complete_type (reader->type_str, reader->type_pos);
1121 DBusString replacement; /**< Marshaled value including alignment padding */
1122 int padding; /**< How much of the replacement block is padding */
1126 replacement_block_init (ReplacementBlock *block,
1127 DBusTypeReader *reader)
1129 if (!_dbus_string_init (&block->replacement))
1132 /* % 8 is the padding to have the same align properties in
1133 * our replacement string as we do at the position being replaced
1135 block->padding = reader->value_pos % 8;
1137 if (!_dbus_string_lengthen (&block->replacement, block->padding))
1143 _dbus_string_free (&block->replacement);
1148 replacement_block_replace (ReplacementBlock *block,
1149 DBusTypeReader *reader,
1150 const DBusTypeReader *realign_root)
1152 DBusTypeWriter writer;
1153 DBusTypeReader realign_reader;
1157 _dbus_assert (realign_root != NULL);
1159 orig_len = _dbus_string_get_length (&block->replacement);
1161 realign_reader = *realign_root;
1163 #if RECURSIVE_MARSHAL_WRITE_TRACE
1164 _dbus_verbose ("INITIALIZING replacement block writer %p at value_pos %d\n",
1165 &writer, _dbus_string_get_length (&block->replacement));
1167 _dbus_type_writer_init_values_only (&writer,
1168 realign_reader.byte_order,
1169 realign_reader.type_str,
1170 realign_reader.type_pos,
1171 &block->replacement,
1172 _dbus_string_get_length (&block->replacement));
1174 _dbus_assert (realign_reader.value_pos <= reader->value_pos);
1176 #if RECURSIVE_MARSHAL_WRITE_TRACE
1177 _dbus_verbose ("COPYING from reader at value_pos %d to writer %p starting after value_pos %d\n",
1178 realign_reader.value_pos, &writer, reader->value_pos);
1181 if (!_dbus_type_writer_write_reader_partial (&writer,
1185 _dbus_string_get_length (&block->replacement) - block->padding,
1189 #if RECURSIVE_MARSHAL_WRITE_TRACE
1190 _dbus_verbose ("REPLACEMENT at padding %d len %d\n", block->padding,
1191 _dbus_string_get_length (&block->replacement) - block->padding);
1192 _dbus_verbose_bytes_of_string (&block->replacement, block->padding,
1193 _dbus_string_get_length (&block->replacement) - block->padding);
1194 _dbus_verbose ("TO BE REPLACED at value_pos = %d (align pad %d) len %d realign_reader.value_pos %d\n",
1195 reader->value_pos, reader->value_pos % 8,
1196 realign_reader.value_pos - reader->value_pos,
1197 realign_reader.value_pos);
1198 _dbus_verbose_bytes_of_string (reader->value_str,
1200 realign_reader.value_pos - reader->value_pos);
1203 /* Move the replacement into position
1204 * (realign_reader should now be at the end of the block to be replaced)
1206 if (!_dbus_string_replace_len (&block->replacement, block->padding,
1207 _dbus_string_get_length (&block->replacement) - block->padding,
1208 (DBusString*) reader->value_str,
1210 realign_reader.value_pos - reader->value_pos))
1213 /* Process our fixups now that we can't have an OOM error */
1214 apply_and_free_fixups (&fixups, reader);
1219 _dbus_string_set_length (&block->replacement, orig_len);
1220 free_fixups (&fixups);
1225 replacement_block_free (ReplacementBlock *block)
1227 _dbus_string_free (&block->replacement);
1230 /* In the variable-length case, we have to fix alignment after we insert.
1231 * The strategy is as follows:
1233 * - pad a new string to have the same alignment as the
1234 * start of the current basic value
1235 * - write the new basic value
1236 * - copy from the original reader to the new string,
1237 * which will fix the alignment of types following
1239 * - this copy has to start at realign_root,
1240 * but not really write anything until it
1241 * passes the value being set
1242 * - as an optimization, we can stop copying
1243 * when the source and dest values are both
1244 * on an 8-boundary, since we know all following
1245 * padding and alignment will be identical
1246 * - copy the new string back to the original
1247 * string, replacing the relevant part of the
1249 * - now any arrays in the original string that
1250 * contained the replaced string may have the
1251 * wrong length; so we have to fix that
1254 reader_set_basic_variable_length (DBusTypeReader *reader,
1257 const DBusTypeReader *realign_root)
1260 ReplacementBlock block;
1261 DBusTypeWriter writer;
1263 _dbus_assert (realign_root != NULL);
1267 if (!replacement_block_init (&block, reader))
1270 /* Write the new basic value */
1271 #if RECURSIVE_MARSHAL_WRITE_TRACE
1272 _dbus_verbose ("INITIALIZING writer %p to write basic value at value_pos %d of replacement string\n",
1273 &writer, _dbus_string_get_length (&block.replacement));
1275 _dbus_type_writer_init_values_only (&writer,
1280 _dbus_string_get_length (&block.replacement));
1281 #if RECURSIVE_MARSHAL_WRITE_TRACE
1282 _dbus_verbose ("WRITING basic value to writer %p (replacement string)\n", &writer);
1284 if (!_dbus_type_writer_write_basic (&writer, current_type, value))
1287 if (!replacement_block_replace (&block,
1295 replacement_block_free (&block);
1300 reader_set_basic_fixed_length (DBusTypeReader *reader,
1304 _dbus_marshal_set_basic ((DBusString*) reader->value_str,
1313 * Sets a new value for the basic type value pointed to by the reader,
1314 * leaving the reader valid to continue reading. Any other readers
1315 * will be invalidated if you set a variable-length type such as a
1318 * The provided realign_root is the reader to start from when
1319 * realigning the data that follows the newly-set value. The reader
1320 * parameter must point to a value below the realign_root parameter.
1321 * If the type being set is fixed-length, then realign_root may be
1322 * #NULL. Only values reachable from realign_root will be realigned,
1323 * so if your string contains other values you will need to deal with
1324 * those somehow yourself. It is OK if realign_root is the same
1325 * reader as the reader parameter, though if you aren't setting the
1326 * root it may not be such a good idea.
1328 * @todo DBusTypeReader currently takes "const" versions of the type
1329 * and value strings, and this function modifies those strings by
1330 * casting away the const, which is of course bad if we want to get
1331 * picky. (To be truly clean you'd have an object which contained the
1332 * type and value strings and set_basic would be a method on that
1333 * object... this would also make DBusTypeReader the same thing as
1334 * DBusTypeMark. But since DBusMessage is effectively that object for
1335 * D-Bus it doesn't seem worth creating some random object.)
1337 * @todo optimize this by only rewriting until the old and new values
1338 * are at the same alignment. Frequently this should result in only
1339 * replacing the value that's immediately at hand.
1341 * @param reader reader indicating where to set a new value
1342 * @param value address of the value to set
1343 * @param realign_root realign from here
1344 * @returns #FALSE if not enough memory
1347 _dbus_type_reader_set_basic (DBusTypeReader *reader,
1349 const DBusTypeReader *realign_root)
1353 _dbus_assert (!reader->klass->types_only);
1354 _dbus_assert (reader->value_str == realign_root->value_str);
1355 _dbus_assert (reader->value_pos >= realign_root->value_pos);
1357 current_type = _dbus_type_reader_get_current_type (reader);
1359 #if RECURSIVE_MARSHAL_WRITE_TRACE
1360 _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",
1361 reader, reader->type_pos, reader->value_pos,
1362 _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0),
1364 realign_root ? realign_root->value_pos : -1,
1365 _dbus_type_to_string (current_type));
1366 _dbus_verbose_bytes_of_string (realign_root->value_str, realign_root->value_pos,
1367 _dbus_string_get_length (realign_root->value_str) -
1368 realign_root->value_pos);
1371 _dbus_assert (dbus_type_is_basic (current_type));
1373 if (dbus_type_is_fixed (current_type))
1375 reader_set_basic_fixed_length (reader, current_type, value);
1380 _dbus_assert (realign_root != NULL);
1381 return reader_set_basic_variable_length (reader, current_type,
1382 value, realign_root);
1387 * Recursively deletes any value pointed to by the reader, leaving the
1388 * reader valid to continue reading. Any other readers will be
1391 * The provided realign_root is the reader to start from when
1392 * realigning the data that follows the newly-set value.
1393 * See _dbus_type_reader_set_basic() for more details on the
1394 * realign_root paramter.
1396 * @todo for now this does not delete the typecodes associated with
1397 * the value, so this function should only be used for array elements.
1399 * @param reader reader indicating where to delete a value
1400 * @param realign_root realign from here
1401 * @returns #FALSE if not enough memory
1404 _dbus_type_reader_delete (DBusTypeReader *reader,
1405 const DBusTypeReader *realign_root)
1408 ReplacementBlock block;
1410 _dbus_assert (realign_root != NULL);
1411 _dbus_assert (reader->klass == &array_reader_class);
1415 if (!replacement_block_init (&block, reader))
1418 if (!replacement_block_replace (&block,
1426 replacement_block_free (&block);
1431 * Compares two readers, which must be iterating over the same value data.
1432 * Returns #TRUE if the first parameter is further along than the second parameter.
1434 * @param lhs left-hand-side (first) parameter
1435 * @param rhs left-hand-side (first) parameter
1436 * @returns whether lhs is greater than rhs
1439 _dbus_type_reader_greater_than (const DBusTypeReader *lhs,
1440 const DBusTypeReader *rhs)
1442 _dbus_assert (lhs->value_str == rhs->value_str);
1444 return lhs->value_pos > rhs->value_pos;
1457 * Initialize a write iterator, which is used to write out values in
1458 * serialized D-Bus format.
1460 * The type_pos passed in is expected to be inside an already-valid,
1461 * though potentially empty, type signature. This means that the byte
1462 * after type_pos must be either #DBUS_TYPE_INVALID (aka nul) or some
1463 * other valid type. #DBusTypeWriter won't enforce that the signature
1464 * is already valid (you can append the nul byte at the end if you
1465 * like), but just be aware that you need the nul byte eventually and
1466 * #DBusTypeWriter isn't going to write it for you.
1468 * @param writer the writer to init
1469 * @param byte_order the byte order to marshal into
1470 * @param type_str the string to write typecodes into
1471 * @param type_pos where to insert typecodes
1472 * @param value_str the string to write values into
1473 * @param value_pos where to insert values
1477 _dbus_type_writer_init (DBusTypeWriter *writer,
1479 DBusString *type_str,
1481 DBusString *value_str,
1484 writer->byte_order = byte_order;
1485 writer->type_str = type_str;
1486 writer->type_pos = type_pos;
1487 writer->value_str = value_str;
1488 writer->value_pos = value_pos;
1489 writer->container_type = DBUS_TYPE_INVALID;
1490 writer->type_pos_is_expectation = FALSE;
1491 writer->enabled = TRUE;
1493 #if RECURSIVE_MARSHAL_WRITE_TRACE
1494 _dbus_verbose ("writer %p init remaining sig '%s'\n", writer,
1496 _dbus_string_get_const_data_len (writer->type_str, writer->type_pos, 0) :
1502 * Initialize a write iterator, with the signature to be provided
1505 * @param writer the writer to init
1506 * @param byte_order the byte order to marshal into
1507 * @param value_str the string to write values into
1508 * @param value_pos where to insert values
1512 _dbus_type_writer_init_types_delayed (DBusTypeWriter *writer,
1514 DBusString *value_str,
1517 _dbus_type_writer_init (writer, byte_order,
1518 NULL, 0, value_str, value_pos);
1522 * Adds type string to the writer, if it had none.
1524 * @param writer the writer to init
1525 * @param type_str type string to add
1526 * @param type_pos type position
1530 _dbus_type_writer_add_types (DBusTypeWriter *writer,
1531 DBusString *type_str,
1534 if (writer->type_str == NULL) /* keeps us from using this as setter */
1536 writer->type_str = type_str;
1537 writer->type_pos = type_pos;
1542 * Removes type string from the writer.
1544 * @param writer the writer to remove from
1547 _dbus_type_writer_remove_types (DBusTypeWriter *writer)
1549 writer->type_str = NULL;
1550 writer->type_pos = -1;
1554 * Like _dbus_type_writer_init(), except the type string
1555 * passed in should correspond to an existing signature that
1556 * matches what you're going to write out. The writer will
1557 * check what you write vs. this existing signature.
1559 * @param writer the writer to init
1560 * @param byte_order the byte order to marshal into
1561 * @param type_str the string with signature
1562 * @param type_pos start of signature
1563 * @param value_str the string to write values into
1564 * @param value_pos where to insert values
1568 _dbus_type_writer_init_values_only (DBusTypeWriter *writer,
1570 const DBusString *type_str,
1572 DBusString *value_str,
1575 _dbus_type_writer_init (writer, byte_order,
1576 (DBusString*)type_str, type_pos,
1577 value_str, value_pos);
1579 writer->type_pos_is_expectation = TRUE;
1583 _dbus_type_writer_write_basic_no_typecode (DBusTypeWriter *writer,
1587 if (writer->enabled)
1588 return _dbus_marshal_write_basic (writer->value_str,
1593 &writer->value_pos);
1598 /* If our parent is an array, things are a little bit complicated.
1600 * The parent must have a complete element type, such as
1601 * "i" or "aai" or "(ii)" or "a(ii)". There can't be
1602 * unclosed parens, or an "a" with no following type.
1604 * To recurse, the only allowed operation is to recurse into the
1605 * first type in the element type. So for "i" you can't recurse, for
1606 * "ai" you can recurse into the array, for "(ii)" you can recurse
1609 * If you recurse into the array for "ai", then you must specify
1610 * "i" for the element type of the array you recurse into.
1612 * While inside an array at any level, we need to avoid writing to
1613 * type_str, since the type only appears once for the whole array,
1614 * it does not appear for each array element.
1616 * While inside an array type_pos points to the expected next
1617 * typecode, rather than the next place we could write a typecode.
1620 writer_recurse_init_and_check (DBusTypeWriter *writer,
1622 DBusTypeWriter *sub)
1624 _dbus_type_writer_init (sub,
1631 sub->container_type = container_type;
1633 if (writer->type_pos_is_expectation ||
1634 (sub->container_type == DBUS_TYPE_ARRAY || sub->container_type == DBUS_TYPE_VARIANT))
1635 sub->type_pos_is_expectation = TRUE;
1637 sub->type_pos_is_expectation = FALSE;
1639 sub->enabled = writer->enabled;
1641 #ifndef DBUS_DISABLE_CHECKS
1642 if (writer->type_pos_is_expectation && writer->type_str)
1646 expected = _dbus_first_type_in_signature (writer->type_str, writer->type_pos);
1648 if (expected != sub->container_type)
1650 if (expected != DBUS_TYPE_INVALID)
1651 _dbus_warn_check_failed ("Writing an element of type %s, but the expected type here is %s\n"
1652 "The overall signature expected here was '%s' and we are on byte %d of that signature.\n",
1653 _dbus_type_to_string (sub->container_type),
1654 _dbus_type_to_string (expected),
1655 _dbus_string_get_const_data (writer->type_str), writer->type_pos);
1657 _dbus_warn_check_failed ("Writing an element of type %s, but no value is expected here\n"
1658 "The overall signature expected here was '%s' and we are on byte %d of that signature.\n",
1659 _dbus_type_to_string (sub->container_type),
1660 _dbus_string_get_const_data (writer->type_str), writer->type_pos);
1662 _dbus_assert_not_reached ("bad array element or variant content written");
1665 #endif /* DBUS_DISABLE_CHECKS */
1667 #if RECURSIVE_MARSHAL_WRITE_TRACE
1668 _dbus_verbose (" type writer %p recurse parent %s type_pos = %d value_pos = %d is_expectation = %d remaining sig '%s' enabled = %d\n",
1670 _dbus_type_to_string (writer->container_type),
1671 writer->type_pos, writer->value_pos, writer->type_pos_is_expectation,
1673 _dbus_string_get_const_data_len (writer->type_str, writer->type_pos, 0) :
1676 _dbus_verbose (" type writer %p recurse sub %s type_pos = %d value_pos = %d is_expectation = %d enabled = %d\n",
1678 _dbus_type_to_string (sub->container_type),
1679 sub->type_pos, sub->value_pos,
1680 sub->type_pos_is_expectation,
1686 write_or_verify_typecode (DBusTypeWriter *writer,
1689 /* A subwriter inside an array or variant will have type_pos
1690 * pointing to the expected typecode; a writer not inside an array
1691 * or variant has type_pos pointing to the next place to insert a
1694 #if RECURSIVE_MARSHAL_WRITE_TRACE
1695 _dbus_verbose (" type writer %p write_or_verify start type_pos = %d remaining sig '%s' enabled = %d\n",
1696 writer, writer->type_pos,
1698 _dbus_string_get_const_data_len (writer->type_str, writer->type_pos, 0) :
1703 if (writer->type_str == NULL)
1706 if (writer->type_pos_is_expectation)
1708 #ifndef DBUS_DISABLE_CHECKS
1712 expected = _dbus_string_get_byte (writer->type_str, writer->type_pos);
1714 if (expected != typecode)
1716 if (expected != DBUS_TYPE_INVALID)
1717 _dbus_warn_check_failed ("Array or variant type requires that type %s be written, but %s was written.\n"
1718 "The overall signature expected here was '%s' and we are on byte %d of that signature.\n",
1719 _dbus_type_to_string (expected), _dbus_type_to_string (typecode),
1720 _dbus_string_get_const_data (writer->type_str), writer->type_pos);
1722 _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"
1723 "The overall signature expected here was '%s' and we are on byte %d of that signature.\n",
1724 _dbus_type_to_string (typecode),
1725 _dbus_string_get_const_data (writer->type_str), writer->type_pos);
1726 _dbus_assert_not_reached ("bad type inserted somewhere inside an array or variant");
1729 #endif /* DBUS_DISABLE_CHECKS */
1731 /* if immediately inside an array we'd always be appending an element,
1732 * so the expected type doesn't change; if inside a struct or something
1733 * below an array, we need to move through said struct or something.
1735 if (writer->container_type != DBUS_TYPE_ARRAY)
1736 writer->type_pos += 1;
1740 if (!_dbus_string_insert_byte (writer->type_str,
1745 writer->type_pos += 1;
1748 #if RECURSIVE_MARSHAL_WRITE_TRACE
1749 _dbus_verbose (" type writer %p write_or_verify end type_pos = %d remaining sig '%s'\n",
1750 writer, writer->type_pos,
1751 _dbus_string_get_const_data_len (writer->type_str, writer->type_pos, 0));
1758 writer_recurse_struct_or_dict_entry (DBusTypeWriter *writer,
1760 const DBusString *contained_type,
1761 int contained_type_start,
1762 int contained_type_len,
1763 DBusTypeWriter *sub)
1765 /* FIXME right now contained_type is ignored; we could probably
1766 * almost trivially fix the code so if it's present we
1767 * write it out and then set type_pos_is_expectation
1770 /* Ensure that we'll be able to add alignment padding and the typecode */
1771 if (writer->enabled)
1773 if (!_dbus_string_alloc_space (sub->value_str, 8))
1777 if (!write_or_verify_typecode (sub, begin_char))
1778 _dbus_assert_not_reached ("failed to insert struct typecode after prealloc");
1780 if (writer->enabled)
1782 if (!_dbus_string_insert_bytes (sub->value_str,
1784 _DBUS_ALIGN_VALUE (sub->value_pos, 8) - sub->value_pos,
1786 _dbus_assert_not_reached ("should not have failed to insert alignment padding for struct");
1787 sub->value_pos = _DBUS_ALIGN_VALUE (sub->value_pos, 8);
1795 writer_recurse_array (DBusTypeWriter *writer,
1796 const DBusString *contained_type,
1797 int contained_type_start,
1798 int contained_type_len,
1799 DBusTypeWriter *sub,
1800 dbus_bool_t is_array_append)
1802 dbus_uint32_t value = 0;
1806 #ifndef DBUS_DISABLE_CHECKS
1807 if (writer->container_type == DBUS_TYPE_ARRAY &&
1810 if (!_dbus_string_equal_substring (contained_type,
1811 contained_type_start,
1814 writer->u.array.element_type_pos + 1))
1816 _dbus_warn_check_failed ("Writing an array of '%s' but this is incompatible with the expected type of elements in the parent array\n",
1817 _dbus_string_get_const_data_len (contained_type,
1818 contained_type_start,
1819 contained_type_len));
1820 _dbus_assert_not_reached ("incompatible type for child array");
1823 #endif /* DBUS_DISABLE_CHECKS */
1825 if (writer->enabled && !is_array_append)
1827 /* 3 pad + 4 bytes for the array length, and 4 bytes possible padding
1828 * before array values
1830 if (!_dbus_string_alloc_space (sub->value_str, 3 + 4 + 4))
1834 if (writer->type_str != NULL)
1836 sub->type_pos += 1; /* move to point to the element type, since type_pos
1837 * should be the expected type for further writes
1839 sub->u.array.element_type_pos = sub->type_pos;
1842 if (!writer->type_pos_is_expectation)
1844 /* sub is a toplevel/outermost array so we need to write the type data */
1846 /* alloc space for array typecode, element signature */
1847 if (!_dbus_string_alloc_space (writer->type_str, 1 + contained_type_len))
1850 if (!_dbus_string_insert_byte (writer->type_str,
1853 _dbus_assert_not_reached ("failed to insert array typecode after prealloc");
1855 if (!_dbus_string_copy_len (contained_type,
1856 contained_type_start, contained_type_len,
1858 sub->u.array.element_type_pos))
1859 _dbus_assert_not_reached ("should not have failed to insert array element typecodes");
1862 if (writer->type_str != NULL)
1864 /* If the parent is an array, we hold type_pos pointing at the array element type;
1865 * otherwise advance it to reflect the array value we just recursed into
1867 if (writer->container_type != DBUS_TYPE_ARRAY)
1868 writer->type_pos += 1 + contained_type_len;
1870 _dbus_assert (writer->type_pos_is_expectation); /* because it's an array */
1873 if (writer->enabled)
1875 /* Write (or jump over, if is_array_append) the length */
1876 sub->u.array.len_pos = _DBUS_ALIGN_VALUE (sub->value_pos, 4);
1878 if (is_array_append)
1880 sub->value_pos += 4;
1884 if (!_dbus_type_writer_write_basic_no_typecode (sub, DBUS_TYPE_UINT32,
1886 _dbus_assert_not_reached ("should not have failed to insert array len");
1889 _dbus_assert (sub->u.array.len_pos == sub->value_pos - 4);
1891 /* Write alignment padding for array elements
1892 * Note that we write the padding *even for empty arrays*
1893 * to avoid wonky special cases
1895 alignment = element_type_get_alignment (contained_type, contained_type_start);
1897 aligned = _DBUS_ALIGN_VALUE (sub->value_pos, alignment);
1898 if (aligned != sub->value_pos)
1900 if (!is_array_append)
1902 if (!_dbus_string_insert_bytes (sub->value_str,
1904 aligned - sub->value_pos,
1906 _dbus_assert_not_reached ("should not have failed to insert alignment padding");
1909 sub->value_pos = aligned;
1912 sub->u.array.start_pos = sub->value_pos;
1914 if (is_array_append)
1918 _dbus_assert (_DBUS_ALIGN_VALUE (sub->u.array.len_pos, 4) ==
1919 (unsigned) sub->u.array.len_pos);
1920 len = _dbus_unpack_uint32 (sub->byte_order,
1921 _dbus_string_get_const_data_len (sub->value_str,
1922 sub->u.array.len_pos,
1925 sub->value_pos += len;
1930 /* not enabled, so we won't write the len_pos; set it to -1 to so indicate */
1931 sub->u.array.len_pos = -1;
1932 sub->u.array.start_pos = sub->value_pos;
1935 _dbus_assert (sub->u.array.len_pos < sub->u.array.start_pos);
1936 _dbus_assert (is_array_append || sub->u.array.start_pos == sub->value_pos);
1938 #if RECURSIVE_MARSHAL_WRITE_TRACE
1939 _dbus_verbose (" type writer %p recurse array done remaining sig '%s' array start_pos = %d len_pos = %d value_pos = %d\n", sub,
1941 _dbus_string_get_const_data_len (sub->type_str, sub->type_pos, 0) :
1943 sub->u.array.start_pos, sub->u.array.len_pos, sub->value_pos);
1949 /* Variant value will normally have:
1950 * 1 byte signature length not including nul
1951 * signature typecodes (nul terminated)
1952 * padding to alignment of contained type
1953 * body according to signature
1955 * The signature string can only have a single type
1956 * in it but that type may be complex/recursive.
1958 * So a typical variant type with the integer 3 will have these
1960 * 0x1 'i' '\0' [1 byte padding to alignment boundary] 0x0 0x0 0x0 0x3
1962 * The main world of hurt for writing out a variant is that the type
1963 * string is the same string as the value string. Which means
1964 * inserting to the type string will move the value_pos; and it means
1965 * that inserting to the type string could break type alignment.
1968 writer_recurse_variant (DBusTypeWriter *writer,
1969 const DBusString *contained_type,
1970 int contained_type_start,
1971 int contained_type_len,
1972 DBusTypeWriter *sub)
1974 int contained_alignment;
1976 if (writer->enabled)
1978 /* Allocate space for the worst case, which is 1 byte sig
1979 * length, nul byte at end of sig, and 7 bytes padding to
1982 if (!_dbus_string_alloc_space (sub->value_str, contained_type_len + 9))
1986 /* write VARIANT typecode to the parent's type string */
1987 if (!write_or_verify_typecode (writer, DBUS_TYPE_VARIANT))
1990 /* If not enabled, mark that we have no type_str anymore ... */
1992 if (!writer->enabled)
1994 sub->type_str = NULL;
2000 /* If we're enabled then continue ... */
2002 if (!_dbus_string_insert_byte (sub->value_str,
2004 contained_type_len))
2005 _dbus_assert_not_reached ("should not have failed to insert variant type sig len");
2007 sub->value_pos += 1;
2009 /* Here we switch over to the expected type sig we're about to write */
2010 sub->type_str = sub->value_str;
2011 sub->type_pos = sub->value_pos;
2013 if (!_dbus_string_copy_len (contained_type, contained_type_start, contained_type_len,
2014 sub->value_str, sub->value_pos))
2015 _dbus_assert_not_reached ("should not have failed to insert variant type sig");
2017 sub->value_pos += contained_type_len;
2019 if (!_dbus_string_insert_byte (sub->value_str,
2022 _dbus_assert_not_reached ("should not have failed to insert variant type nul termination");
2024 sub->value_pos += 1;
2026 contained_alignment = _dbus_type_get_alignment (_dbus_first_type_in_signature (contained_type, contained_type_start));
2028 if (!_dbus_string_insert_bytes (sub->value_str,
2030 _DBUS_ALIGN_VALUE (sub->value_pos, contained_alignment) - sub->value_pos,
2032 _dbus_assert_not_reached ("should not have failed to insert alignment padding for variant body");
2033 sub->value_pos = _DBUS_ALIGN_VALUE (sub->value_pos, contained_alignment);
2039 _dbus_type_writer_recurse_contained_len (DBusTypeWriter *writer,
2041 const DBusString *contained_type,
2042 int contained_type_start,
2043 int contained_type_len,
2044 DBusTypeWriter *sub,
2045 dbus_bool_t is_array_append)
2047 writer_recurse_init_and_check (writer, container_type, sub);
2049 switch (container_type)
2051 case DBUS_TYPE_STRUCT:
2052 return writer_recurse_struct_or_dict_entry (writer,
2053 DBUS_STRUCT_BEGIN_CHAR,
2055 contained_type_start, contained_type_len,
2058 case DBUS_TYPE_DICT_ENTRY:
2059 return writer_recurse_struct_or_dict_entry (writer,
2060 DBUS_DICT_ENTRY_BEGIN_CHAR,
2062 contained_type_start, contained_type_len,
2065 case DBUS_TYPE_ARRAY:
2066 return writer_recurse_array (writer,
2067 contained_type, contained_type_start, contained_type_len,
2068 sub, is_array_append);
2070 case DBUS_TYPE_VARIANT:
2071 return writer_recurse_variant (writer,
2072 contained_type, contained_type_start, contained_type_len,
2076 _dbus_assert_not_reached ("tried to recurse into type that doesn't support that");
2083 * Opens a new container and writes out the initial information for that container.
2085 * @param writer the writer
2086 * @param container_type the type of the container to open
2087 * @param contained_type the array element type or variant content type
2088 * @param contained_type_start position to look for the type
2089 * @param sub the new sub-writer to write container contents
2090 * @returns #FALSE if no memory
2093 _dbus_type_writer_recurse (DBusTypeWriter *writer,
2095 const DBusString *contained_type,
2096 int contained_type_start,
2097 DBusTypeWriter *sub)
2099 int contained_type_len;
2102 contained_type_len = find_len_of_complete_type (contained_type, contained_type_start);
2104 contained_type_len = 0;
2106 return _dbus_type_writer_recurse_contained_len (writer, container_type,
2108 contained_type_start,
2115 * Append to an existing array. Essentially, the writer will read an
2116 * existing length at the write location; jump over that length; and
2117 * write new fields. On unrecurse(), the existing length will be
2120 * @param writer the writer
2121 * @param contained_type element type
2122 * @param contained_type_start position of element type
2123 * @param sub the subwriter to init
2124 * @returns #FALSE if no memory
2127 _dbus_type_writer_append_array (DBusTypeWriter *writer,
2128 const DBusString *contained_type,
2129 int contained_type_start,
2130 DBusTypeWriter *sub)
2132 int contained_type_len;
2135 contained_type_len = find_len_of_complete_type (contained_type, contained_type_start);
2137 contained_type_len = 0;
2139 return _dbus_type_writer_recurse_contained_len (writer, DBUS_TYPE_ARRAY,
2141 contained_type_start,
2148 writer_get_array_len (DBusTypeWriter *writer)
2150 _dbus_assert (writer->container_type == DBUS_TYPE_ARRAY);
2151 return writer->value_pos - writer->u.array.start_pos;
2155 * Closes a container created by _dbus_type_writer_recurse()
2156 * and writes any additional information to the values block.
2158 * @param writer the writer
2159 * @param sub the sub-writer created by _dbus_type_writer_recurse()
2160 * @returns #FALSE if no memory
2163 _dbus_type_writer_unrecurse (DBusTypeWriter *writer,
2164 DBusTypeWriter *sub)
2166 /* type_pos_is_expectation never gets unset once set, or we'd get all hosed */
2167 _dbus_assert (!writer->type_pos_is_expectation ||
2168 (writer->type_pos_is_expectation && sub->type_pos_is_expectation));
2170 #if RECURSIVE_MARSHAL_WRITE_TRACE
2171 _dbus_verbose (" type writer %p unrecurse type_pos = %d value_pos = %d is_expectation = %d container_type = %s\n",
2172 writer, writer->type_pos, writer->value_pos, writer->type_pos_is_expectation,
2173 _dbus_type_to_string (writer->container_type));
2174 _dbus_verbose (" type writer %p unrecurse sub type_pos = %d value_pos = %d is_expectation = %d container_type = %s\n",
2175 sub, sub->type_pos, sub->value_pos,
2176 sub->type_pos_is_expectation,
2177 _dbus_type_to_string (sub->container_type));
2180 if (sub->container_type == DBUS_TYPE_STRUCT)
2182 if (!write_or_verify_typecode (sub, DBUS_STRUCT_END_CHAR))
2185 else if (sub->container_type == DBUS_TYPE_DICT_ENTRY)
2187 if (!write_or_verify_typecode (sub, DBUS_DICT_ENTRY_END_CHAR))
2190 else if (sub->container_type == DBUS_TYPE_ARRAY)
2192 if (sub->u.array.len_pos >= 0) /* len_pos == -1 if we weren't enabled when we passed it */
2196 /* Set the array length */
2197 len = writer_get_array_len (sub);
2198 _dbus_marshal_set_uint32 (sub->value_str,
2199 sub->u.array.len_pos,
2202 #if RECURSIVE_MARSHAL_WRITE_TRACE
2203 _dbus_verbose (" filled in sub array len to %u at len_pos %d\n",
2204 len, sub->u.array.len_pos);
2207 #if RECURSIVE_MARSHAL_WRITE_TRACE
2210 _dbus_verbose (" not filling in sub array len because we were disabled when we passed the len\n");
2215 /* Now get type_pos right for the parent writer. Here are the cases:
2217 * Cases !writer->type_pos_is_expectation:
2218 * (in these cases we want to update to the new insertion point)
2220 * - if we recursed into a STRUCT then we didn't know in advance
2221 * what the types in the struct would be; so we have to fill in
2222 * that information now.
2223 * writer->type_pos = sub->type_pos
2225 * - if we recursed into anything else, we knew the full array
2226 * type, or knew the single typecode marking VARIANT, so
2227 * writer->type_pos is already correct.
2228 * writer->type_pos should remain as-is
2230 * - note that the parent is never an ARRAY or VARIANT, if it were
2231 * then type_pos_is_expectation would be TRUE. The parent
2232 * is thus known to be a toplevel or STRUCT.
2234 * Cases where writer->type_pos_is_expectation:
2235 * (in these cases we want to update to next expected type to write)
2237 * - we recursed from STRUCT into STRUCT and we didn't increment
2238 * type_pos in the parent just to stay consistent with the
2239 * !writer->type_pos_is_expectation case (though we could
2240 * special-case this in recurse_struct instead if we wanted)
2241 * writer->type_pos = sub->type_pos
2243 * - we recursed from STRUCT into ARRAY or VARIANT and type_pos
2244 * for parent should have been incremented already
2245 * writer->type_pos should remain as-is
2247 * - we recursed from ARRAY into a sub-element, so type_pos in the
2248 * parent is the element type and should remain the element type
2249 * for the benefit of the next child element
2250 * writer->type_pos should remain as-is
2252 * - we recursed from VARIANT into its value, so type_pos in the
2253 * parent makes no difference since there's only one value
2254 * and we just finished writing it and won't use type_pos again
2255 * writer->type_pos should remain as-is
2258 * For all these, DICT_ENTRY is the same as STRUCT
2260 if (writer->type_str != NULL)
2262 if ((sub->container_type == DBUS_TYPE_STRUCT ||
2263 sub->container_type == DBUS_TYPE_DICT_ENTRY) &&
2264 (writer->container_type == DBUS_TYPE_STRUCT ||
2265 writer->container_type == DBUS_TYPE_DICT_ENTRY ||
2266 writer->container_type == DBUS_TYPE_INVALID))
2268 /* Advance the parent to the next struct field */
2269 writer->type_pos = sub->type_pos;
2273 writer->value_pos = sub->value_pos;
2275 #if RECURSIVE_MARSHAL_WRITE_TRACE
2276 _dbus_verbose (" type writer %p unrecursed type_pos = %d value_pos = %d remaining sig '%s'\n",
2277 writer, writer->type_pos, writer->value_pos,
2279 _dbus_string_get_const_data_len (writer->type_str, writer->type_pos, 0) :
2287 * Writes out a basic type.
2289 * @param writer the writer
2290 * @param type the type to write
2291 * @param value the address of the value to write
2292 * @returns #FALSE if no memory
2295 _dbus_type_writer_write_basic (DBusTypeWriter *writer,
2301 /* First ensure that our type realloc will succeed */
2302 if (!writer->type_pos_is_expectation && writer->type_str != NULL)
2304 if (!_dbus_string_alloc_space (writer->type_str, 1))
2310 if (!_dbus_type_writer_write_basic_no_typecode (writer, type, value))
2313 if (!write_or_verify_typecode (writer, type))
2314 _dbus_assert_not_reached ("failed to write typecode after prealloc");
2319 #if RECURSIVE_MARSHAL_WRITE_TRACE
2320 _dbus_verbose (" type writer %p basic type_pos = %d value_pos = %d is_expectation = %d enabled = %d\n",
2321 writer, writer->type_pos, writer->value_pos, writer->type_pos_is_expectation,
2329 * Writes a block of fixed-length basic values, i.e. those that are
2330 * both dbus_type_is_fixed() and _dbus_type_is_basic(). The block
2331 * must be written inside an array.
2333 * The value parameter should be the address of said array of values,
2334 * so e.g. if it's an array of double, pass in "const double**"
2336 * @param writer the writer
2337 * @param element_type type of stuff in the array
2338 * @param value address of the array
2339 * @param n_elements number of elements in the array
2340 * @returns #FALSE if no memory
2343 _dbus_type_writer_write_fixed_multi (DBusTypeWriter *writer,
2348 _dbus_assert (writer->container_type == DBUS_TYPE_ARRAY);
2349 _dbus_assert (dbus_type_is_fixed (element_type));
2350 _dbus_assert (writer->type_pos_is_expectation);
2351 _dbus_assert (n_elements >= 0);
2353 #if RECURSIVE_MARSHAL_WRITE_TRACE
2354 _dbus_verbose (" type writer %p entering fixed multi type_pos = %d value_pos = %d n_elements %d\n",
2355 writer, writer->type_pos, writer->value_pos, n_elements);
2358 if (!write_or_verify_typecode (writer, element_type))
2359 _dbus_assert_not_reached ("OOM should not happen if only verifying typecode");
2361 if (writer->enabled)
2363 if (!_dbus_marshal_write_fixed_multi (writer->value_str,
2369 &writer->value_pos))
2373 #if RECURSIVE_MARSHAL_WRITE_TRACE
2374 _dbus_verbose (" type writer %p fixed multi written new type_pos = %d new value_pos = %d n_elements %d\n",
2375 writer, writer->type_pos, writer->value_pos, n_elements);
2382 enable_if_after (DBusTypeWriter *writer,
2383 DBusTypeReader *reader,
2384 const DBusTypeReader *start_after)
2388 if (!writer->enabled && _dbus_type_reader_greater_than (reader, start_after))
2390 _dbus_type_writer_set_enabled (writer, TRUE);
2391 #if RECURSIVE_MARSHAL_WRITE_TRACE
2392 _dbus_verbose ("ENABLING writer %p at %d because reader at value_pos %d is after reader at value_pos %d\n",
2393 writer, writer->value_pos, reader->value_pos, start_after->value_pos);
2397 _dbus_assert ((!writer->enabled && !_dbus_type_reader_greater_than (reader, start_after)) ||
2398 (writer->enabled && _dbus_type_reader_greater_than (reader, start_after)));
2403 append_fixup (DBusList **fixups,
2404 const DBusArrayLenFixup *fixup)
2406 DBusArrayLenFixup *f;
2408 f = dbus_new (DBusArrayLenFixup, 1);
2414 if (!_dbus_list_append (fixups, f))
2420 _dbus_assert (f->len_pos_in_reader == fixup->len_pos_in_reader);
2421 _dbus_assert (f->new_len == fixup->new_len);
2426 /* This loop is trivial if you ignore all the start_after nonsense,
2427 * so if you're trying to figure it out, start by ignoring that
2430 writer_write_reader_helper (DBusTypeWriter *writer,
2431 DBusTypeReader *reader,
2432 const DBusTypeReader *start_after,
2433 int start_after_new_pos,
2434 int start_after_new_len,
2436 dbus_bool_t inside_start_after)
2440 while ((current_type = _dbus_type_reader_get_current_type (reader)) != DBUS_TYPE_INVALID)
2442 if (dbus_type_is_container (current_type))
2444 DBusTypeReader subreader;
2445 DBusTypeWriter subwriter;
2446 const DBusString *sig_str;
2449 dbus_bool_t enabled_at_recurse;
2450 dbus_bool_t past_start_after;
2451 int reader_array_len_pos;
2452 int reader_array_start_pos;
2453 dbus_bool_t this_is_start_after;
2455 /* type_pos is checked since e.g. in a struct the struct
2456 * and its first field have the same value_pos.
2457 * type_str will differ in reader/start_after for variants
2458 * where type_str is inside the value_str
2460 if (!inside_start_after && start_after &&
2461 reader->value_pos == start_after->value_pos &&
2462 reader->type_str == start_after->type_str &&
2463 reader->type_pos == start_after->type_pos)
2464 this_is_start_after = TRUE;
2466 this_is_start_after = FALSE;
2468 _dbus_type_reader_recurse (reader, &subreader);
2470 if (current_type == DBUS_TYPE_ARRAY)
2472 reader_array_len_pos = ARRAY_READER_LEN_POS (&subreader);
2473 reader_array_start_pos = subreader.u.array.start_pos;
2478 reader_array_len_pos = -1;
2479 reader_array_start_pos = -1;
2482 _dbus_type_reader_get_signature (&subreader, &sig_str,
2483 &sig_start, &sig_len);
2485 #if RECURSIVE_MARSHAL_WRITE_TRACE
2486 _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",
2487 _dbus_type_to_string (current_type),
2489 subreader.value_pos,
2491 start_after ? start_after->value_pos : -1,
2492 _dbus_string_get_length (writer->value_str),
2493 inside_start_after, this_is_start_after);
2496 if (!inside_start_after && !this_is_start_after)
2497 enable_if_after (writer, &subreader, start_after);
2498 enabled_at_recurse = writer->enabled;
2499 if (!_dbus_type_writer_recurse_contained_len (writer, current_type,
2500 sig_str, sig_start, sig_len,
2504 #if RECURSIVE_MARSHAL_WRITE_TRACE
2505 _dbus_verbose ("recursed into subwriter at %d write target len %d\n",
2506 subwriter.value_pos,
2507 _dbus_string_get_length (subwriter.value_str));
2510 if (!writer_write_reader_helper (&subwriter, &subreader, start_after,
2511 start_after_new_pos, start_after_new_len,
2513 inside_start_after ||
2514 this_is_start_after))
2517 #if RECURSIVE_MARSHAL_WRITE_TRACE
2518 _dbus_verbose ("about to unrecurse from %s subreader at %d writer at %d subwriter at %d write target len %d\n",
2519 _dbus_type_to_string (current_type),
2520 subreader.value_pos,
2522 subwriter.value_pos,
2523 _dbus_string_get_length (writer->value_str));
2526 if (!inside_start_after && !this_is_start_after)
2527 enable_if_after (writer, &subreader, start_after);
2528 past_start_after = writer->enabled;
2529 if (!_dbus_type_writer_unrecurse (writer, &subwriter))
2532 /* If we weren't enabled when we recursed, we didn't
2533 * write an array len; if we passed start_after
2534 * somewhere inside the array, then we need to generate
2537 if (start_after != NULL &&
2538 !enabled_at_recurse && past_start_after &&
2539 current_type == DBUS_TYPE_ARRAY &&
2542 DBusArrayLenFixup fixup;
2543 int bytes_written_after_start_after;
2544 int bytes_before_start_after;
2547 /* this subwriter access is moderately unkosher since we
2548 * already unrecursed, but it works as long as unrecurse
2549 * doesn't break us on purpose
2551 bytes_written_after_start_after = writer_get_array_len (&subwriter);
2553 bytes_before_start_after =
2554 start_after->value_pos - reader_array_start_pos;
2556 fixup.len_pos_in_reader = reader_array_len_pos;
2558 bytes_before_start_after +
2559 start_after_new_len +
2560 bytes_written_after_start_after;
2562 _dbus_assert (_DBUS_ALIGN_VALUE (fixup.len_pos_in_reader, 4) ==
2563 (unsigned) fixup.len_pos_in_reader);
2565 old_len = _dbus_unpack_uint32 (reader->byte_order,
2566 _dbus_string_get_const_data_len (reader->value_str,
2567 fixup.len_pos_in_reader, 4));
2569 if (old_len != fixup.new_len && !append_fixup (fixups, &fixup))
2572 #if RECURSIVE_MARSHAL_WRITE_TRACE
2573 _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",
2574 fixup.len_pos_in_reader,
2576 reader_array_start_pos,
2577 start_after->value_pos,
2578 bytes_before_start_after,
2579 start_after_new_len,
2580 bytes_written_after_start_after);
2588 _dbus_assert (dbus_type_is_basic (current_type));
2590 #if RECURSIVE_MARSHAL_WRITE_TRACE
2591 _dbus_verbose ("Reading basic value %s at %d\n",
2592 _dbus_type_to_string (current_type),
2596 _dbus_type_reader_read_basic (reader, &val);
2598 #if RECURSIVE_MARSHAL_WRITE_TRACE
2599 _dbus_verbose ("Writing basic value %s at %d write target len %d inside_start_after = %d\n",
2600 _dbus_type_to_string (current_type),
2602 _dbus_string_get_length (writer->value_str),
2603 inside_start_after);
2605 if (!inside_start_after)
2606 enable_if_after (writer, reader, start_after);
2607 if (!_dbus_type_writer_write_basic (writer, current_type, &val))
2609 #if RECURSIVE_MARSHAL_WRITE_TRACE
2610 _dbus_verbose ("Wrote basic value %s, new value_pos %d write target len %d\n",
2611 _dbus_type_to_string (current_type),
2613 _dbus_string_get_length (writer->value_str));
2617 _dbus_type_reader_next (reader);
2624 apply_and_free_fixups (fixups, NULL); /* NULL for reader to apply to */
2630 * Iterate through all values in the given reader, writing a copy of
2631 * each value to the writer. The reader will be moved forward to its
2634 * If a reader start_after is provided, it should be a reader for the
2635 * same data as the reader to be written. Only values occurring after
2636 * the value pointed to by start_after will be written to the writer.
2638 * If start_after is provided, then the copy of the reader will be
2639 * partial. This means that array lengths will not have been copied.
2640 * The assumption is that you wrote a new version of the value at
2641 * start_after to the writer. You have to pass in the start position
2642 * and length of the new value. (If you are deleting the value
2643 * at start_after, pass in 0 for the length.)
2645 * If the fixups parameter is non-#NULL, then any array length that
2646 * was read but not written due to start_after will be provided
2647 * as a #DBusArrayLenFixup. The fixup contains the position of the
2648 * array length in the source data, and the correct array length
2649 * assuming you combine the source data before start_after with
2650 * the written data at start_after and beyond.
2652 * @param writer the writer to copy to
2653 * @param reader the reader to copy from
2654 * @param start_after #NULL or a reader showing where to start
2655 * @param start_after_new_pos the position of start_after equivalent in the target data
2656 * @param start_after_new_len the length of start_after equivalent in the target data
2657 * @param fixups list to append #DBusArrayLenFixup if the write was partial
2658 * @returns #FALSE if no memory
2661 _dbus_type_writer_write_reader_partial (DBusTypeWriter *writer,
2662 DBusTypeReader *reader,
2663 const DBusTypeReader *start_after,
2664 int start_after_new_pos,
2665 int start_after_new_len,
2668 DBusTypeWriter orig;
2675 orig_type_len = _dbus_string_get_length (writer->type_str);
2676 orig_value_len = _dbus_string_get_length (writer->value_str);
2677 orig_enabled = writer->enabled;
2680 _dbus_type_writer_set_enabled (writer, FALSE);
2682 if (!writer_write_reader_helper (writer, reader, start_after,
2683 start_after_new_pos,
2684 start_after_new_len,
2688 _dbus_type_writer_set_enabled (writer, orig_enabled);
2692 if (!writer->type_pos_is_expectation)
2694 new_bytes = _dbus_string_get_length (writer->type_str) - orig_type_len;
2695 _dbus_string_delete (writer->type_str, orig.type_pos, new_bytes);
2697 new_bytes = _dbus_string_get_length (writer->value_str) - orig_value_len;
2698 _dbus_string_delete (writer->value_str, orig.value_pos, new_bytes);
2706 * Iterate through all values in the given reader, writing a copy of
2707 * each value to the writer. The reader will be moved forward to its
2710 * @param writer the writer to copy to
2711 * @param reader the reader to copy from
2712 * @returns #FALSE if no memory
2715 _dbus_type_writer_write_reader (DBusTypeWriter *writer,
2716 DBusTypeReader *reader)
2718 return _dbus_type_writer_write_reader_partial (writer, reader, NULL, 0, 0, NULL);
2722 * If disabled, a writer can still be iterated forward and recursed/unrecursed
2723 * but won't write any values. Types will still be written unless the
2724 * writer is a "values only" writer, because the writer needs access to
2725 * a valid signature to be able to iterate.
2727 * @param writer the type writer
2728 * @param enabled #TRUE if values should be written
2731 _dbus_type_writer_set_enabled (DBusTypeWriter *writer,
2732 dbus_bool_t enabled)
2734 writer->enabled = enabled != FALSE;
2737 /** @} */ /* end of DBusMarshal group */
2739 /* tests in dbus-marshal-recursive-util.c */