diff options
Diffstat (limited to 'src/3rd_party/dbus-1.7.8/dbus/dbus-marshal-recursive.c')
| -rw-r--r-- | src/3rd_party/dbus-1.7.8/dbus/dbus-marshal-recursive.c | 2752 |
1 files changed, 0 insertions, 2752 deletions
diff --git a/src/3rd_party/dbus-1.7.8/dbus/dbus-marshal-recursive.c b/src/3rd_party/dbus-1.7.8/dbus/dbus-marshal-recursive.c deleted file mode 100644 index 4adfd2e9f3..0000000000 --- a/src/3rd_party/dbus-1.7.8/dbus/dbus-marshal-recursive.c +++ /dev/null @@ -1,2752 +0,0 @@ -/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */ -/* dbus-marshal-recursive.c Marshalling routines for recursive types - * - * Copyright (C) 2004, 2005 Red Hat, Inc. - * - * Licensed under the Academic Free License version 2.1 - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - * - */ - -#include <config.h> -#include "dbus-marshal-recursive.h" -#include "dbus-marshal-basic.h" -#include "dbus-signature.h" -#include "dbus-internals.h" - -/** - * @addtogroup DBusMarshal - * @{ - */ - -static dbus_bool_t _dbus_type_reader_greater_than (const DBusTypeReader *lhs, - const DBusTypeReader *rhs); - -static void _dbus_type_writer_set_enabled (DBusTypeWriter *writer, - dbus_bool_t enabled); -static dbus_bool_t _dbus_type_writer_write_reader_partial (DBusTypeWriter *writer, - DBusTypeReader *reader, - const DBusTypeReader *start_after, - int start_after_new_pos, - int start_after_new_len, - DBusList **fixups); - -/** turn this on to get deluged in TypeReader verbose spam */ -#define RECURSIVE_MARSHAL_READ_TRACE 0 - -/** turn this on to get deluged in TypeWriter verbose spam */ -#define RECURSIVE_MARSHAL_WRITE_TRACE 0 - -static void -free_fixups (DBusList **fixups) -{ - DBusList *link; - - link = _dbus_list_get_first_link (fixups); - while (link != NULL) - { - DBusList *next; - - next = _dbus_list_get_next_link (fixups, link); - - dbus_free (link->data); - _dbus_list_free_link (link); - - link = next; - } - - *fixups = NULL; -} - -static void -apply_and_free_fixups (DBusList **fixups, - DBusTypeReader *reader) -{ - DBusList *link; - -#if RECURSIVE_MARSHAL_WRITE_TRACE - if (*fixups) - _dbus_verbose (" %d FIXUPS to apply\n", - _dbus_list_get_length (fixups)); -#endif - - link = _dbus_list_get_first_link (fixups); - while (link != NULL) - { - DBusList *next; - - next = _dbus_list_get_next_link (fixups, link); - - if (reader) - { - DBusArrayLenFixup *f; - - f = link->data; - -#if RECURSIVE_MARSHAL_WRITE_TRACE - _dbus_verbose (" applying FIXUP to reader %p at pos %d new_len = %d old len %d\n", - reader, f->len_pos_in_reader, f->new_len, - _dbus_marshal_read_uint32 (reader->value_str, - f->len_pos_in_reader, - reader->byte_order, NULL)); -#endif - - _dbus_marshal_set_uint32 ((DBusString*) reader->value_str, - f->len_pos_in_reader, - f->new_len, - reader->byte_order); - } - - dbus_free (link->data); - _dbus_list_free_link (link); - - link = next; - } - - *fixups = NULL; -} - -/** - * Virtual table for a type reader. - */ -struct DBusTypeReaderClass -{ - const char *name; /**< name for debugging */ - int id; /**< index in all_reader_classes */ - dbus_bool_t types_only; /**< only iterates over types, not values */ - void (* recurse) (DBusTypeReader *sub, - DBusTypeReader *parent); /**< recurse with this reader as sub */ - dbus_bool_t (* check_finished) (const DBusTypeReader *reader); /**< check whether reader is at the end */ - void (* next) (DBusTypeReader *reader, - int current_type); /**< go to the next value */ -}; - -static int -element_type_get_alignment (const DBusString *str, - int pos) -{ - return _dbus_type_get_alignment (_dbus_first_type_in_signature (str, pos)); -} - -static void -reader_init (DBusTypeReader *reader, - int byte_order, - const DBusString *type_str, - int type_pos, - const DBusString *value_str, - int value_pos) -{ - reader->byte_order = byte_order; - reader->finished = FALSE; - reader->type_str = type_str; - reader->type_pos = type_pos; - reader->value_str = value_str; - reader->value_pos = value_pos; -} - -static void -base_reader_recurse (DBusTypeReader *sub, - DBusTypeReader *parent) -{ - /* point subreader at the same place as parent */ - reader_init (sub, - parent->byte_order, - parent->type_str, - parent->type_pos, - parent->value_str, - parent->value_pos); -} - -static void -struct_or_dict_entry_types_only_reader_recurse (DBusTypeReader *sub, - DBusTypeReader *parent) -{ - base_reader_recurse (sub, parent); - - _dbus_assert (_dbus_string_get_byte (sub->type_str, - sub->type_pos) == DBUS_STRUCT_BEGIN_CHAR || - _dbus_string_get_byte (sub->type_str, - sub->type_pos) == DBUS_DICT_ENTRY_BEGIN_CHAR); - - sub->type_pos += 1; -} - -static void -struct_or_dict_entry_reader_recurse (DBusTypeReader *sub, - DBusTypeReader *parent) -{ - struct_or_dict_entry_types_only_reader_recurse (sub, parent); - - /* struct and dict entry have 8 byte alignment */ - sub->value_pos = _DBUS_ALIGN_VALUE (sub->value_pos, 8); -} - -static void -array_types_only_reader_recurse (DBusTypeReader *sub, - DBusTypeReader *parent) -{ - base_reader_recurse (sub, parent); - - /* point type_pos at the array element type */ - sub->type_pos += 1; - - /* Init with values likely to crash things if misused */ - sub->u.array.start_pos = _DBUS_INT_MAX; - sub->array_len_offset = 7; -} - -/** compute position of array length given array_len_offset, which is - the offset back from start_pos to end of the len */ -#define ARRAY_READER_LEN_POS(reader) \ - ((reader)->u.array.start_pos - ((int)(reader)->array_len_offset) - 4) - -static int -array_reader_get_array_len (const DBusTypeReader *reader) -{ - dbus_uint32_t array_len; - int len_pos; - - len_pos = ARRAY_READER_LEN_POS (reader); - - _dbus_assert (_DBUS_ALIGN_VALUE (len_pos, 4) == (unsigned) len_pos); - array_len = _dbus_unpack_uint32 (reader->byte_order, - _dbus_string_get_const_data_len (reader->value_str, len_pos, 4)); - -#if RECURSIVE_MARSHAL_READ_TRACE - _dbus_verbose (" reader %p len_pos %d array len %u len_offset %d\n", - reader, len_pos, array_len, reader->array_len_offset); -#endif - - _dbus_assert (reader->u.array.start_pos - len_pos - 4 < 8); - - return array_len; -} - -static void -array_reader_recurse (DBusTypeReader *sub, - DBusTypeReader *parent) -{ - int alignment; - int len_pos; - - array_types_only_reader_recurse (sub, parent); - - sub->value_pos = _DBUS_ALIGN_VALUE (sub->value_pos, 4); - - len_pos = sub->value_pos; - - sub->value_pos += 4; /* for the length */ - - alignment = element_type_get_alignment (sub->type_str, - sub->type_pos); - - sub->value_pos = _DBUS_ALIGN_VALUE (sub->value_pos, alignment); - - sub->u.array.start_pos = sub->value_pos; - _dbus_assert ((sub->u.array.start_pos - (len_pos + 4)) < 8); /* only 3 bits in array_len_offset */ - sub->array_len_offset = sub->u.array.start_pos - (len_pos + 4); - -#if RECURSIVE_MARSHAL_READ_TRACE - _dbus_verbose (" type reader %p array start = %d len_offset = %d array len = %d array element type = %s\n", - sub, - sub->u.array.start_pos, - sub->array_len_offset, - array_reader_get_array_len (sub), - _dbus_type_to_string (_dbus_first_type_in_signature (sub->type_str, - sub->type_pos))); -#endif -} - -static void -variant_reader_recurse (DBusTypeReader *sub, - DBusTypeReader *parent) -{ - int sig_len; - int contained_alignment; - - base_reader_recurse (sub, parent); - - /* Variant is 1 byte sig length (without nul), signature with nul, - * padding to 8-boundary, then values - */ - - sig_len = _dbus_string_get_byte (sub->value_str, sub->value_pos); - - sub->type_str = sub->value_str; - sub->type_pos = sub->value_pos + 1; - - sub->value_pos = sub->type_pos + sig_len + 1; - - contained_alignment = _dbus_type_get_alignment (_dbus_first_type_in_signature (sub->type_str, - sub->type_pos)); - - sub->value_pos = _DBUS_ALIGN_VALUE (sub->value_pos, contained_alignment); - -#if RECURSIVE_MARSHAL_READ_TRACE - _dbus_verbose (" type reader %p variant containing '%s'\n", - sub, - _dbus_string_get_const_data_len (sub->type_str, - sub->type_pos, 0)); -#endif -} - -static dbus_bool_t -array_reader_check_finished (const DBusTypeReader *reader) -{ - int end_pos; - - /* return the array element type if elements remain, and - * TYPE_INVALID otherwise - */ - - end_pos = reader->u.array.start_pos + array_reader_get_array_len (reader); - - _dbus_assert (reader->value_pos <= end_pos); - _dbus_assert (reader->value_pos >= reader->u.array.start_pos); - - return reader->value_pos == end_pos; -} - -static void -skip_one_complete_type (const DBusString *type_str, - int *type_pos) -{ - _dbus_type_signature_next (_dbus_string_get_const_data (type_str), - type_pos); -} - -/** - * Skips to the next "complete" type inside a type signature. - * The signature is read starting at type_pos, and the next - * type position is stored in the same variable. - * - * @param type_str a type signature (must be valid) - * @param type_pos an integer position in the type signature (in and out) - */ -void -_dbus_type_signature_next (const char *type_str, - int *type_pos) -{ - const unsigned char *p; - const unsigned char *start; - - _dbus_assert (type_str != NULL); - _dbus_assert (type_pos != NULL); - - start = type_str; - p = start + *type_pos; - - _dbus_assert (*p != DBUS_STRUCT_END_CHAR); - _dbus_assert (*p != DBUS_DICT_ENTRY_END_CHAR); - - while (*p == DBUS_TYPE_ARRAY) - ++p; - - _dbus_assert (*p != DBUS_STRUCT_END_CHAR); - _dbus_assert (*p != DBUS_DICT_ENTRY_END_CHAR); - - if (*p == DBUS_STRUCT_BEGIN_CHAR) - { - int depth; - - depth = 1; - - while (TRUE) - { - _dbus_assert (*p != DBUS_TYPE_INVALID); - - ++p; - - _dbus_assert (*p != DBUS_TYPE_INVALID); - - if (*p == DBUS_STRUCT_BEGIN_CHAR) - depth += 1; - else if (*p == DBUS_STRUCT_END_CHAR) - { - depth -= 1; - if (depth == 0) - { - ++p; - break; - } - } - } - } - else if (*p == DBUS_DICT_ENTRY_BEGIN_CHAR) - { - int depth; - - depth = 1; - - while (TRUE) - { - _dbus_assert (*p != DBUS_TYPE_INVALID); - - ++p; - - _dbus_assert (*p != DBUS_TYPE_INVALID); - - if (*p == DBUS_DICT_ENTRY_BEGIN_CHAR) - depth += 1; - else if (*p == DBUS_DICT_ENTRY_END_CHAR) - { - depth -= 1; - if (depth == 0) - { - ++p; - break; - } - } - } - } - else - { - ++p; - } - - *type_pos = (int) (p - start); -} - -static int -find_len_of_complete_type (const DBusString *type_str, - int type_pos) -{ - int end; - - end = type_pos; - - skip_one_complete_type (type_str, &end); - - return end - type_pos; -} - -static void -base_reader_next (DBusTypeReader *reader, - int current_type) -{ - switch (current_type) - { - case DBUS_TYPE_DICT_ENTRY: - case DBUS_TYPE_STRUCT: - case DBUS_TYPE_VARIANT: - /* Scan forward over the entire container contents */ - { - DBusTypeReader sub; - - if (reader->klass->types_only && current_type == DBUS_TYPE_VARIANT) - ; - else - { - /* Recurse into the struct or variant */ - _dbus_type_reader_recurse (reader, &sub); - - /* Skip everything in this subreader */ - while (_dbus_type_reader_next (&sub)) - { - /* nothing */; - } - } - if (!reader->klass->types_only) - reader->value_pos = sub.value_pos; - - /* Now we are at the end of this container; for variants, the - * subreader's type_pos is totally inapplicable (it's in the - * value string) but we know that we increment by one past the - * DBUS_TYPE_VARIANT - */ - if (current_type == DBUS_TYPE_VARIANT) - reader->type_pos += 1; - else - reader->type_pos = sub.type_pos; - } - break; - - case DBUS_TYPE_ARRAY: - { - if (!reader->klass->types_only) - _dbus_marshal_skip_array (reader->value_str, - _dbus_first_type_in_signature (reader->type_str, - reader->type_pos + 1), - reader->byte_order, - &reader->value_pos); - - skip_one_complete_type (reader->type_str, &reader->type_pos); - } - break; - - default: - if (!reader->klass->types_only) - _dbus_marshal_skip_basic (reader->value_str, - current_type, reader->byte_order, - &reader->value_pos); - - reader->type_pos += 1; - break; - } -} - -static void -struct_reader_next (DBusTypeReader *reader, - int current_type) -{ - int t; - - base_reader_next (reader, current_type); - - /* for STRUCT containers we return FALSE at the end of the struct, - * for INVALID we return FALSE at the end of the signature. - * In both cases we arrange for get_current_type() to return INVALID - * which is defined to happen iff we're at the end (no more next()) - */ - t = _dbus_string_get_byte (reader->type_str, reader->type_pos); - if (t == DBUS_STRUCT_END_CHAR) - { - reader->type_pos += 1; - reader->finished = TRUE; - } -} - -static void -dict_entry_reader_next (DBusTypeReader *reader, - int current_type) -{ - int t; - - base_reader_next (reader, current_type); - - /* for STRUCT containers we return FALSE at the end of the struct, - * for INVALID we return FALSE at the end of the signature. - * In both cases we arrange for get_current_type() to return INVALID - * which is defined to happen iff we're at the end (no more next()) - */ - t = _dbus_string_get_byte (reader->type_str, reader->type_pos); - if (t == DBUS_DICT_ENTRY_END_CHAR) - { - reader->type_pos += 1; - reader->finished = TRUE; - } -} - -static void -array_types_only_reader_next (DBusTypeReader *reader, - int current_type) -{ - /* We have one "element" to be iterated over - * in each array, which is its element type. - * So the finished flag indicates whether we've - * iterated over it yet or not. - */ - reader->finished = TRUE; -} - -static void -array_reader_next (DBusTypeReader *reader, - int current_type) -{ - /* Skip one array element */ - int end_pos; - - end_pos = reader->u.array.start_pos + array_reader_get_array_len (reader); - -#if RECURSIVE_MARSHAL_READ_TRACE - _dbus_verbose (" reader %p array next START start_pos = %d end_pos = %d value_pos = %d current_type = %s\n", - reader, - reader->u.array.start_pos, - end_pos, reader->value_pos, - _dbus_type_to_string (current_type)); -#endif - - _dbus_assert (reader->value_pos < end_pos); - _dbus_assert (reader->value_pos >= reader->u.array.start_pos); - - switch (_dbus_first_type_in_signature (reader->type_str, - reader->type_pos)) - { - case DBUS_TYPE_DICT_ENTRY: - case DBUS_TYPE_STRUCT: - case DBUS_TYPE_VARIANT: - { - DBusTypeReader sub; - - /* Recurse into the struct or variant */ - _dbus_type_reader_recurse (reader, &sub); - - /* Skip everything in this element */ - while (_dbus_type_reader_next (&sub)) - { - /* nothing */; - } - - /* Now we are at the end of this element */ - reader->value_pos = sub.value_pos; - } - break; - - case DBUS_TYPE_ARRAY: - { - _dbus_marshal_skip_array (reader->value_str, - _dbus_first_type_in_signature (reader->type_str, - reader->type_pos + 1), - reader->byte_order, - &reader->value_pos); - } - break; - - default: - { - _dbus_marshal_skip_basic (reader->value_str, - current_type, reader->byte_order, - &reader->value_pos); - } - break; - } - -#if RECURSIVE_MARSHAL_READ_TRACE - _dbus_verbose (" reader %p array next END start_pos = %d end_pos = %d value_pos = %d current_type = %s\n", - reader, - reader->u.array.start_pos, - end_pos, reader->value_pos, - _dbus_type_to_string (current_type)); -#endif - - _dbus_assert (reader->value_pos <= end_pos); - - if (reader->value_pos == end_pos) - { - skip_one_complete_type (reader->type_str, - &reader->type_pos); - } -} - -static const DBusTypeReaderClass body_reader_class = { - "body", 0, - FALSE, - NULL, /* body is always toplevel, so doesn't get recursed into */ - NULL, - base_reader_next -}; - -static const DBusTypeReaderClass body_types_only_reader_class = { - "body types", 1, - TRUE, - NULL, /* body is always toplevel, so doesn't get recursed into */ - NULL, - base_reader_next -}; - -static const DBusTypeReaderClass struct_reader_class = { - "struct", 2, - FALSE, - struct_or_dict_entry_reader_recurse, - NULL, - struct_reader_next -}; - -static const DBusTypeReaderClass struct_types_only_reader_class = { - "struct types", 3, - TRUE, - struct_or_dict_entry_types_only_reader_recurse, - NULL, - struct_reader_next -}; - -static const DBusTypeReaderClass dict_entry_reader_class = { - "dict_entry", 4, - FALSE, - struct_or_dict_entry_reader_recurse, - NULL, - dict_entry_reader_next -}; - -static const DBusTypeReaderClass dict_entry_types_only_reader_class = { - "dict_entry types", 5, - TRUE, - struct_or_dict_entry_types_only_reader_recurse, - NULL, - dict_entry_reader_next -}; - -static const DBusTypeReaderClass array_reader_class = { - "array", 6, - FALSE, - array_reader_recurse, - array_reader_check_finished, - array_reader_next -}; - -static const DBusTypeReaderClass array_types_only_reader_class = { - "array types", 7, - TRUE, - array_types_only_reader_recurse, - NULL, - array_types_only_reader_next -}; - -static const DBusTypeReaderClass variant_reader_class = { - "variant", 8, - FALSE, - variant_reader_recurse, - NULL, - base_reader_next -}; - -#ifndef DBUS_DISABLE_ASSERT -static const DBusTypeReaderClass * const -all_reader_classes[] = { - &body_reader_class, - &body_types_only_reader_class, - &struct_reader_class, - &struct_types_only_reader_class, - &dict_entry_reader_class, - &dict_entry_types_only_reader_class, - &array_reader_class, - &array_types_only_reader_class, - &variant_reader_class -}; -#endif - -/** - * Initializes a type reader. - * - * @param reader the reader - * @param byte_order the byte order of the block to read - * @param type_str the signature of the block to read - * @param type_pos location of signature - * @param value_str the string containing values block - * @param value_pos start of values block - */ -void -_dbus_type_reader_init (DBusTypeReader *reader, - int byte_order, - const DBusString *type_str, - int type_pos, - const DBusString *value_str, - int value_pos) -{ - reader->klass = &body_reader_class; - - reader_init (reader, byte_order, type_str, type_pos, - value_str, value_pos); - -#if RECURSIVE_MARSHAL_READ_TRACE - _dbus_verbose (" type reader %p init type_pos = %d value_pos = %d remaining sig '%s'\n", - reader, reader->type_pos, reader->value_pos, - _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0)); -#endif -} - -/** - * Like _dbus_type_reader_init() but the iteration is over the - * signature, not over values. - * - * @param reader the reader - * @param type_str the signature string - * @param type_pos location in the signature string - */ -void -_dbus_type_reader_init_types_only (DBusTypeReader *reader, - const DBusString *type_str, - int type_pos) -{ - reader->klass = &body_types_only_reader_class; - - reader_init (reader, DBUS_COMPILER_BYTE_ORDER /* irrelevant */, - type_str, type_pos, NULL, _DBUS_INT_MAX /* crashes if we screw up */); - -#if RECURSIVE_MARSHAL_READ_TRACE - _dbus_verbose (" type reader %p init types only type_pos = %d remaining sig '%s'\n", - reader, reader->type_pos, - _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0)); -#endif -} - -/** - * Gets the type of the value the reader is currently pointing to; - * or for a types-only reader gets the type it's currently pointing to. - * If the reader is at the end of a block or end of a container such - * as an array, returns #DBUS_TYPE_INVALID. - * - * @param reader the reader - */ -int -_dbus_type_reader_get_current_type (const DBusTypeReader *reader) -{ - int t; - - if (reader->finished || - (reader->klass->check_finished && - (* reader->klass->check_finished) (reader))) - t = DBUS_TYPE_INVALID; - else - t = _dbus_first_type_in_signature (reader->type_str, - reader->type_pos); - - _dbus_assert (t != DBUS_STRUCT_END_CHAR); - _dbus_assert (t != DBUS_STRUCT_BEGIN_CHAR); - _dbus_assert (t != DBUS_DICT_ENTRY_END_CHAR); - _dbus_assert (t != DBUS_DICT_ENTRY_BEGIN_CHAR); - -#if 0 - _dbus_verbose (" type reader %p current type_pos = %d type = %s\n", - reader, reader->type_pos, - _dbus_type_to_string (t)); -#endif - - return t; -} - -/** - * Gets the type of an element of the array the reader is currently - * pointing to. It's an error to call this if - * _dbus_type_reader_get_current_type() doesn't return #DBUS_TYPE_ARRAY - * for this reader. - * - * @param reader the reader - */ -int -_dbus_type_reader_get_element_type (const DBusTypeReader *reader) -{ - int element_type; - - _dbus_assert (_dbus_type_reader_get_current_type (reader) == DBUS_TYPE_ARRAY); - - element_type = _dbus_first_type_in_signature (reader->type_str, - reader->type_pos + 1); - - return element_type; -} - -/** - * Gets the current position in the value block - * @param reader the reader - */ -int -_dbus_type_reader_get_value_pos (const DBusTypeReader *reader) -{ - return reader->value_pos; -} - -/** - * Get the address of the marshaled value in the data being read. The - * address may not be aligned; you have to align it to the type of the - * value you want to read. Most of the demarshal routines do this for - * you. - * - * @param reader the reader - * @param value_location the address of the marshaled value - */ -void -_dbus_type_reader_read_raw (const DBusTypeReader *reader, - const unsigned char **value_location) -{ - _dbus_assert (!reader->klass->types_only); - - *value_location = _dbus_string_get_const_data_len (reader->value_str, - reader->value_pos, - 0); -} - -/** - * Reads a basic-typed value, as with _dbus_marshal_read_basic(). - * - * @param reader the reader - * @param value the address of the value - */ -void -_dbus_type_reader_read_basic (const DBusTypeReader *reader, - void *value) -{ - int t; - - _dbus_assert (!reader->klass->types_only); - - t = _dbus_type_reader_get_current_type (reader); - - _dbus_marshal_read_basic (reader->value_str, - reader->value_pos, - t, value, - reader->byte_order, - NULL); - - -#if RECURSIVE_MARSHAL_READ_TRACE - _dbus_verbose (" type reader %p read basic type_pos = %d value_pos = %d remaining sig '%s'\n", - reader, reader->type_pos, reader->value_pos, - _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0)); -#endif -} - -/** - * Returns the number of bytes in the array. - * - * @param reader the reader to read from - * @returns the number of bytes in the array - */ -int -_dbus_type_reader_get_array_length (const DBusTypeReader *reader) -{ - _dbus_assert (!reader->klass->types_only); - _dbus_assert (reader->klass == &array_reader_class); - - return array_reader_get_array_len (reader); -} - -/** - * Reads a block of fixed-length basic values, from the current point - * in an array to the end of the array. Does not work for arrays of - * string or container types. - * - * This function returns the array in-place; it does not make a copy, - * and it does not swap the bytes. - * - * If you ask for #DBUS_TYPE_DOUBLE you will get a "const double*" back - * and the "value" argument should be a "const double**" and so on. - * - * @param reader the reader to read from - * @param value place to return the array values - * @param n_elements place to return number of array elements - */ -void -_dbus_type_reader_read_fixed_multi (const DBusTypeReader *reader, - void *value, - int *n_elements) -{ - int element_type; - int end_pos; - int remaining_len; - int alignment; - int total_len; - - _dbus_assert (!reader->klass->types_only); - _dbus_assert (reader->klass == &array_reader_class); - - element_type = _dbus_first_type_in_signature (reader->type_str, - reader->type_pos); - - _dbus_assert (element_type != DBUS_TYPE_INVALID); /* why we don't use get_current_type() */ - _dbus_assert (dbus_type_is_fixed (element_type)); - - alignment = _dbus_type_get_alignment (element_type); - - _dbus_assert (reader->value_pos >= reader->u.array.start_pos); - - total_len = array_reader_get_array_len (reader); - end_pos = reader->u.array.start_pos + total_len; - remaining_len = end_pos - reader->value_pos; - -#if RECURSIVE_MARSHAL_READ_TRACE - _dbus_verbose ("end_pos %d total_len %d remaining_len %d value_pos %d\n", - end_pos, total_len, remaining_len, reader->value_pos); -#endif - - _dbus_assert (remaining_len <= total_len); - - if (remaining_len == 0) - *(const DBusBasicValue**) value = NULL; - else - *(const DBusBasicValue**) value = - (void*) _dbus_string_get_const_data_len (reader->value_str, - reader->value_pos, - remaining_len); - - *n_elements = remaining_len / alignment; - _dbus_assert ((remaining_len % alignment) == 0); - -#if RECURSIVE_MARSHAL_READ_TRACE - _dbus_verbose (" type reader %p read fixed array type_pos = %d value_pos = %d remaining sig '%s'\n", - reader, reader->type_pos, reader->value_pos, - _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0)); -#endif -} - -/** - * Initialize a new reader pointing to the first type and - * corresponding value that's a child of the current container. It's - * an error to call this if the current type is a non-container. - * - * Note that DBusTypeReader traverses values, not types. So if you - * have an empty array of array of int, you can't recurse into it. You - * can only recurse into each element. - * - * @param reader the reader - * @param sub a reader to init pointing to the first child - */ -void -_dbus_type_reader_recurse (DBusTypeReader *reader, - DBusTypeReader *sub) -{ - int t; - - t = _dbus_first_type_in_signature (reader->type_str, reader->type_pos); - - switch (t) - { - case DBUS_TYPE_STRUCT: - if (reader->klass->types_only) - sub->klass = &struct_types_only_reader_class; - else - sub->klass = &struct_reader_class; - break; - case DBUS_TYPE_DICT_ENTRY: - if (reader->klass->types_only) - sub->klass = &dict_entry_types_only_reader_class; - else - sub->klass = &dict_entry_reader_class; - break; - case DBUS_TYPE_ARRAY: - if (reader->klass->types_only) - sub->klass = &array_types_only_reader_class; - else - sub->klass = &array_reader_class; - break; - case DBUS_TYPE_VARIANT: - if (reader->klass->types_only) - _dbus_assert_not_reached ("can't recurse into variant typecode"); - else - sub->klass = &variant_reader_class; - break; - default: - _dbus_verbose ("recursing into type %s\n", _dbus_type_to_string (t)); -#ifndef DBUS_DISABLE_CHECKS - if (t == DBUS_TYPE_INVALID) - _dbus_warn_check_failed ("You can't recurse into an empty array or off the end of a message body\n"); -#endif /* DBUS_DISABLE_CHECKS */ - - _dbus_assert_not_reached ("don't yet handle recursing into this type"); - } - - _dbus_assert (sub->klass == all_reader_classes[sub->klass->id]); - - (* sub->klass->recurse) (sub, reader); - -#if RECURSIVE_MARSHAL_READ_TRACE - _dbus_verbose (" type reader %p RECURSED type_pos = %d value_pos = %d remaining sig '%s'\n", - sub, sub->type_pos, sub->value_pos, - _dbus_string_get_const_data_len (sub->type_str, sub->type_pos, 0)); -#endif -} - -/** - * Skip to the next value on this "level". e.g. the next field in a - * struct, the next value in an array. Returns FALSE at the end of the - * current container. - * - * @param reader the reader - * @returns FALSE if nothing more to read at or below this level - */ -dbus_bool_t -_dbus_type_reader_next (DBusTypeReader *reader) -{ - int t; - - t = _dbus_type_reader_get_current_type (reader); - -#if RECURSIVE_MARSHAL_READ_TRACE - _dbus_verbose (" type reader %p START next() { type_pos = %d value_pos = %d remaining sig '%s' current_type = %s\n", - reader, reader->type_pos, reader->value_pos, - _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0), - _dbus_type_to_string (t)); -#endif - - if (t == DBUS_TYPE_INVALID) - return FALSE; - - (* reader->klass->next) (reader, t); - -#if RECURSIVE_MARSHAL_READ_TRACE - _dbus_verbose (" type reader %p END next() type_pos = %d value_pos = %d remaining sig '%s' current_type = %s\n", - reader, reader->type_pos, reader->value_pos, - _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0), - _dbus_type_to_string (_dbus_type_reader_get_current_type (reader))); -#endif - - return _dbus_type_reader_get_current_type (reader) != DBUS_TYPE_INVALID; -} - -/** - * Check whether there's another value on this "level". e.g. the next - * field in a struct, the next value in an array. Returns FALSE at the - * end of the current container. - * - * You probably don't want to use this; it makes for an awkward for/while - * loop. A nicer one is "while ((current_type = get_current_type()) != INVALID)" - * - * @param reader the reader - * @returns FALSE if nothing more to read at or below this level - */ -dbus_bool_t -_dbus_type_reader_has_next (const DBusTypeReader *reader) -{ - /* Not efficient but works for now. */ - DBusTypeReader copy; - - copy = *reader; - return _dbus_type_reader_next (©); -} - -/** - * Gets the string and range of said string containing the signature - * of the current value. Essentially a more complete version of - * _dbus_type_reader_get_current_type() (returns the full type - * rather than only the outside of the onion). - * - * Note though that the first byte in a struct signature is - * #DBUS_STRUCT_BEGIN_CHAR while the current type will be - * #DBUS_TYPE_STRUCT so it isn't true that the first byte of the - * signature is always the same as the current type. Another - * difference is that this function will still return a signature when - * inside an empty array; say you recurse into empty array of int32, - * the signature is "i" but the current type will always be - * #DBUS_TYPE_INVALID since there are no elements to be currently - * pointing to. - * - * @param reader the reader - * @param str_p place to return the string with the type in it - * @param start_p place to return start of the type - * @param len_p place to return the length of the type - */ -void -_dbus_type_reader_get_signature (const DBusTypeReader *reader, - const DBusString **str_p, - int *start_p, - int *len_p) -{ - *str_p = reader->type_str; - *start_p = reader->type_pos; - *len_p = find_len_of_complete_type (reader->type_str, reader->type_pos); -} - -typedef struct -{ - DBusString replacement; /**< Marshaled value including alignment padding */ - int padding; /**< How much of the replacement block is padding */ -} ReplacementBlock; - -static dbus_bool_t -replacement_block_init (ReplacementBlock *block, - DBusTypeReader *reader) -{ - if (!_dbus_string_init (&block->replacement)) - return FALSE; - - /* % 8 is the padding to have the same align properties in - * our replacement string as we do at the position being replaced - */ - block->padding = reader->value_pos % 8; - - if (!_dbus_string_lengthen (&block->replacement, block->padding)) - goto oom; - - return TRUE; - - oom: - _dbus_string_free (&block->replacement); - return FALSE; -} - -static dbus_bool_t -replacement_block_replace (ReplacementBlock *block, - DBusTypeReader *reader, - const DBusTypeReader *realign_root) -{ - DBusTypeWriter writer; - DBusTypeReader realign_reader; - DBusList *fixups; - int orig_len; - - _dbus_assert (realign_root != NULL); - - orig_len = _dbus_string_get_length (&block->replacement); - - realign_reader = *realign_root; - -#if RECURSIVE_MARSHAL_WRITE_TRACE - _dbus_verbose ("INITIALIZING replacement block writer %p at value_pos %d\n", - &writer, _dbus_string_get_length (&block->replacement)); -#endif - _dbus_type_writer_init_values_only (&writer, - realign_reader.byte_order, - realign_reader.type_str, - realign_reader.type_pos, - &block->replacement, - _dbus_string_get_length (&block->replacement)); - - _dbus_assert (realign_reader.value_pos <= reader->value_pos); - -#if RECURSIVE_MARSHAL_WRITE_TRACE - _dbus_verbose ("COPYING from reader at value_pos %d to writer %p starting after value_pos %d\n", - realign_reader.value_pos, &writer, reader->value_pos); -#endif - fixups = NULL; - if (!_dbus_type_writer_write_reader_partial (&writer, - &realign_reader, - reader, - block->padding, - _dbus_string_get_length (&block->replacement) - block->padding, - &fixups)) - goto oom; - -#if RECURSIVE_MARSHAL_WRITE_TRACE - _dbus_verbose ("REPLACEMENT at padding %d len %d\n", block->padding, - _dbus_string_get_length (&block->replacement) - block->padding); - _dbus_verbose_bytes_of_string (&block->replacement, block->padding, - _dbus_string_get_length (&block->replacement) - block->padding); - _dbus_verbose ("TO BE REPLACED at value_pos = %d (align pad %d) len %d realign_reader.value_pos %d\n", - reader->value_pos, reader->value_pos % 8, - realign_reader.value_pos - reader->value_pos, - realign_reader.value_pos); - _dbus_verbose_bytes_of_string (reader->value_str, - reader->value_pos, - realign_reader.value_pos - reader->value_pos); -#endif - - /* Move the replacement into position - * (realign_reader should now be at the end of the block to be replaced) - */ - if (!_dbus_string_replace_len (&block->replacement, block->padding, - _dbus_string_get_length (&block->replacement) - block->padding, - (DBusString*) reader->value_str, - reader->value_pos, - realign_reader.value_pos - reader->value_pos)) - goto oom; - - /* Process our fixups now that we can't have an OOM error */ - apply_and_free_fixups (&fixups, reader); - - return TRUE; - - oom: - _dbus_string_set_length (&block->replacement, orig_len); - free_fixups (&fixups); - return FALSE; -} - -static void -replacement_block_free (ReplacementBlock *block) -{ - _dbus_string_free (&block->replacement); -} - -/* In the variable-length case, we have to fix alignment after we insert. - * The strategy is as follows: - * - * - pad a new string to have the same alignment as the - * start of the current basic value - * - write the new basic value - * - copy from the original reader to the new string, - * which will fix the alignment of types following - * the new value - * - this copy has to start at realign_root, - * but not really write anything until it - * passes the value being set - * - as an optimization, we can stop copying - * when the source and dest values are both - * on an 8-boundary, since we know all following - * padding and alignment will be identical - * - copy the new string back to the original - * string, replacing the relevant part of the - * original string - * - now any arrays in the original string that - * contained the replaced string may have the - * wrong length; so we have to fix that - */ -static dbus_bool_t -reader_set_basic_variable_length (DBusTypeReader *reader, - int current_type, - const void *value, - const DBusTypeReader *realign_root) -{ - dbus_bool_t retval; - ReplacementBlock block; - DBusTypeWriter writer; - - _dbus_assert (realign_root != NULL); - - retval = FALSE; - - if (!replacement_block_init (&block, reader)) - return FALSE; - - /* Write the new basic value */ -#if RECURSIVE_MARSHAL_WRITE_TRACE - _dbus_verbose ("INITIALIZING writer %p to write basic value at value_pos %d of replacement string\n", - &writer, _dbus_string_get_length (&block.replacement)); -#endif - _dbus_type_writer_init_values_only (&writer, - reader->byte_order, - reader->type_str, - reader->type_pos, - &block.replacement, - _dbus_string_get_length (&block.replacement)); -#if RECURSIVE_MARSHAL_WRITE_TRACE - _dbus_verbose ("WRITING basic value to writer %p (replacement string)\n", &writer); -#endif - if (!_dbus_type_writer_write_basic (&writer, current_type, value)) - goto out; - - if (!replacement_block_replace (&block, - reader, - realign_root)) - goto out; - - retval = TRUE; - - out: - replacement_block_free (&block); - return retval; -} - -static void -reader_set_basic_fixed_length (DBusTypeReader *reader, - int current_type, - const void *value) -{ - _dbus_marshal_set_basic ((DBusString*) reader->value_str, - reader->value_pos, - current_type, - value, - reader->byte_order, - NULL, NULL); -} - -/** - * Sets a new value for the basic type value pointed to by the reader, - * leaving the reader valid to continue reading. Any other readers - * will be invalidated if you set a variable-length type such as a - * string. - * - * The provided realign_root is the reader to start from when - * realigning the data that follows the newly-set value. The reader - * parameter must point to a value below the realign_root parameter. - * If the type being set is fixed-length, then realign_root may be - * #NULL. Only values reachable from realign_root will be realigned, - * so if your string contains other values you will need to deal with - * those somehow yourself. It is OK if realign_root is the same - * reader as the reader parameter, though if you aren't setting the - * root it may not be such a good idea. - * - * @todo DBusTypeReader currently takes "const" versions of the type - * and value strings, and this function modifies those strings by - * casting away the const, which is of course bad if we want to get - * picky. (To be truly clean you'd have an object which contained the - * type and value strings and set_basic would be a method on that - * object... this would also make DBusTypeReader the same thing as - * DBusTypeMark. But since DBusMessage is effectively that object for - * D-Bus it doesn't seem worth creating some random object.) - * - * @todo optimize this by only rewriting until the old and new values - * are at the same alignment. Frequently this should result in only - * replacing the value that's immediately at hand. - * - * @param reader reader indicating where to set a new value - * @param value address of the value to set - * @param realign_root realign from here - * @returns #FALSE if not enough memory - */ -dbus_bool_t -_dbus_type_reader_set_basic (DBusTypeReader *reader, - const void *value, - const DBusTypeReader *realign_root) -{ - int current_type; - - _dbus_assert (!reader->klass->types_only); - _dbus_assert (reader->value_str == realign_root->value_str); - _dbus_assert (reader->value_pos >= realign_root->value_pos); - - current_type = _dbus_type_reader_get_current_type (reader); - -#if RECURSIVE_MARSHAL_WRITE_TRACE - _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", - reader, reader->type_pos, reader->value_pos, - _dbus_string_get_const_data_len (reader->type_str, reader->type_pos, 0), - realign_root, - realign_root ? realign_root->value_pos : -1, - _dbus_type_to_string (current_type)); - _dbus_verbose_bytes_of_string (realign_root->value_str, realign_root->value_pos, - _dbus_string_get_length (realign_root->value_str) - - realign_root->value_pos); -#endif - - _dbus_assert (dbus_type_is_basic (current_type)); - - if (dbus_type_is_fixed (current_type)) - { - reader_set_basic_fixed_length (reader, current_type, value); - return TRUE; - } - else - { - _dbus_assert (realign_root != NULL); - return reader_set_basic_variable_length (reader, current_type, - value, realign_root); - } -} - -/** - * Recursively deletes any value pointed to by the reader, leaving the - * reader valid to continue reading. Any other readers will be - * invalidated. - * - * The provided realign_root is the reader to start from when - * realigning the data that follows the newly-set value. - * See _dbus_type_reader_set_basic() for more details on the - * realign_root paramter. - * - * @todo for now this does not delete the typecodes associated with - * the value, so this function should only be used for array elements. - * - * @param reader reader indicating where to delete a value - * @param realign_root realign from here - * @returns #FALSE if not enough memory - */ -dbus_bool_t -_dbus_type_reader_delete (DBusTypeReader *reader, - const DBusTypeReader *realign_root) -{ - dbus_bool_t retval; - ReplacementBlock block; - - _dbus_assert (realign_root != NULL); - _dbus_assert (reader->klass == &array_reader_class); - - retval = FALSE; - - if (!replacement_block_init (&block, reader)) - return FALSE; - - if (!replacement_block_replace (&block, - reader, - realign_root)) - goto out; - - retval = TRUE; - - out: - replacement_block_free (&block); - return retval; -} - -/* - * Compares two readers, which must be iterating over the same value data. - * Returns #TRUE if the first parameter is further along than the second parameter. - * - * @param lhs left-hand-side (first) parameter - * @param rhs left-hand-side (first) parameter - * @returns whether lhs is greater than rhs - */ -static dbus_bool_t -_dbus_type_reader_greater_than (const DBusTypeReader *lhs, - const DBusTypeReader *rhs) -{ - _dbus_assert (lhs->value_str == rhs->value_str); - - return lhs->value_pos > rhs->value_pos; -} - -/* - * - * - * DBusTypeWriter - * - * - * - */ - -/** - * Initialize a write iterator, which is used to write out values in - * serialized D-Bus format. - * - * The type_pos passed in is expected to be inside an already-valid, - * though potentially empty, type signature. This means that the byte - * after type_pos must be either #DBUS_TYPE_INVALID (aka nul) or some - * other valid type. #DBusTypeWriter won't enforce that the signature - * is already valid (you can append the nul byte at the end if you - * like), but just be aware that you need the nul byte eventually and - * #DBusTypeWriter isn't going to write it for you. - * - * @param writer the writer to init - * @param byte_order the byte order to marshal into - * @param type_str the string to write typecodes into - * @param type_pos where to insert typecodes - * @param value_str the string to write values into - * @param value_pos where to insert values - * - */ -void -_dbus_type_writer_init (DBusTypeWriter *writer, - int byte_order, - DBusString *type_str, - int type_pos, - DBusString *value_str, - int value_pos) -{ - writer->byte_order = byte_order; - writer->type_str = type_str; - writer->type_pos = type_pos; - writer->value_str = value_str; - writer->value_pos = value_pos; - writer->container_type = DBUS_TYPE_INVALID; - writer->type_pos_is_expectation = FALSE; - writer->enabled = TRUE; - -#if RECURSIVE_MARSHAL_WRITE_TRACE - _dbus_verbose ("writer %p init remaining sig '%s'\n", writer, - writer->type_str ? - _dbus_string_get_const_data_len (writer->type_str, writer->type_pos, 0) : - "unknown"); -#endif -} - -/** - * Initialize a write iterator, with the signature to be provided - * later. - * - * @param writer the writer to init - * @param byte_order the byte order to marshal into - * @param value_str the string to write values into - * @param value_pos where to insert values - * - */ -void -_dbus_type_writer_init_types_delayed (DBusTypeWriter *writer, - int byte_order, - DBusString *value_str, - int value_pos) -{ - _dbus_type_writer_init (writer, byte_order, - NULL, 0, value_str, value_pos); -} - -/** - * Adds type string to the writer, if it had none. - * - * @param writer the writer to init - * @param type_str type string to add - * @param type_pos type position - * - */ -void -_dbus_type_writer_add_types (DBusTypeWriter *writer, - DBusString *type_str, - int type_pos) -{ - if (writer->type_str == NULL) /* keeps us from using this as setter */ - { - writer->type_str = type_str; - writer->type_pos = type_pos; - } -} - -/** - * Removes type string from the writer. - * - * @param writer the writer to remove from - */ -void -_dbus_type_writer_remove_types (DBusTypeWriter *writer) -{ - writer->type_str = NULL; - writer->type_pos = -1; -} - -/** - * Like _dbus_type_writer_init(), except the type string - * passed in should correspond to an existing signature that - * matches what you're going to write out. The writer will - * check what you write vs. this existing signature. - * - * @param writer the writer to init - * @param byte_order the byte order to marshal into - * @param type_str the string with signature - * @param type_pos start of signature - * @param value_str the string to write values into - * @param value_pos where to insert values - * - */ -void -_dbus_type_writer_init_values_only (DBusTypeWriter *writer, - int byte_order, - const DBusString *type_str, - int type_pos, - DBusString *value_str, - int value_pos) -{ - _dbus_type_writer_init (writer, byte_order, - (DBusString*)type_str, type_pos, - value_str, value_pos); - - writer->type_pos_is_expectation = TRUE; -} - -static dbus_bool_t -_dbus_type_writer_write_basic_no_typecode (DBusTypeWriter *writer, - int type, - const void *value) -{ - if (writer->enabled) - return _dbus_marshal_write_basic (writer->value_str, - writer->value_pos, - type, - value, - writer->byte_order, - &writer->value_pos); - else - return TRUE; -} - -/* If our parent is an array, things are a little bit complicated. - * - * The parent must have a complete element type, such as - * "i" or "aai" or "(ii)" or "a(ii)". There can't be - * unclosed parens, or an "a" with no following type. - * - * To recurse, the only allowed operation is to recurse into the - * first type in the element type. So for "i" you can't recurse, for - * "ai" you can recurse into the array, for "(ii)" you can recurse - * into the struct. - * - * If you recurse into the array for "ai", then you must specify - * "i" for the element type of the array you recurse into. - * - * While inside an array at any level, we need to avoid writing to - * type_str, since the type only appears once for the whole array, - * it does not appear for each array element. - * - * While inside an array type_pos points to the expected next - * typecode, rather than the next place we could write a typecode. - */ -static void -writer_recurse_init_and_check (DBusTypeWriter *writer, - int container_type, - DBusTypeWriter *sub) -{ - _dbus_type_writer_init (sub, - writer->byte_order, - writer->type_str, - writer->type_pos, - writer->value_str, - writer->value_pos); - - sub->container_type = container_type; - - if (writer->type_pos_is_expectation || - (sub->container_type == DBUS_TYPE_ARRAY || sub->container_type == DBUS_TYPE_VARIANT)) - sub->type_pos_is_expectation = TRUE; - else - sub->type_pos_is_expectation = FALSE; - - sub->enabled = writer->enabled; - -#ifndef DBUS_DISABLE_CHECKS - if (writer->type_pos_is_expectation && writer->type_str) - { - int expected; - - expected = _dbus_first_type_in_signature (writer->type_str, writer->type_pos); - - if (expected != sub->container_type) - { - if (expected != DBUS_TYPE_INVALID) - _dbus_warn_check_failed ("Writing an element of type %s, but the expected type here is %s\n" - "The overall signature expected here was '%s' and we are on byte %d of that signature.\n", - _dbus_type_to_string (sub->container_type), - _dbus_type_to_string (expected), - _dbus_string_get_const_data (writer->type_str), writer->type_pos); - else - _dbus_warn_check_failed ("Writing an element of type %s, but no value is expected here\n" - "The overall signature expected here was '%s' and we are on byte %d of that signature.\n", - _dbus_type_to_string (sub->container_type), - _dbus_string_get_const_data (writer->type_str), writer->type_pos); - - _dbus_assert_not_reached ("bad array element or variant content written"); - } - } -#endif /* DBUS_DISABLE_CHECKS */ - -#if RECURSIVE_MARSHAL_WRITE_TRACE - _dbus_verbose (" type writer %p recurse parent %s type_pos = %d value_pos = %d is_expectation = %d remaining sig '%s' enabled = %d\n", - writer, - _dbus_type_to_string (writer->container_type), - writer->type_pos, writer->value_pos, writer->type_pos_is_expectation, - writer->type_str ? - _dbus_string_get_const_data_len (writer->type_str, writer->type_pos, 0) : - "unknown", - writer->enabled); - _dbus_verbose (" type writer %p recurse sub %s type_pos = %d value_pos = %d is_expectation = %d enabled = %d\n", - sub, - _dbus_type_to_string (sub->container_type), - sub->type_pos, sub->value_pos, - sub->type_pos_is_expectation, - sub->enabled); -#endif -} - -static dbus_bool_t -write_or_verify_typecode (DBusTypeWriter *writer, - int typecode) -{ - /* A subwriter inside an array or variant will have type_pos - * pointing to the expected typecode; a writer not inside an array - * or variant has type_pos pointing to the next place to insert a - * typecode. - */ -#if RECURSIVE_MARSHAL_WRITE_TRACE - _dbus_verbose (" type writer %p write_or_verify start type_pos = %d remaining sig '%s' enabled = %d\n", - writer, writer->type_pos, - writer->type_str ? - _dbus_string_get_const_data_len (writer->type_str, writer->type_pos, 0) : - "unknown", - writer->enabled); -#endif - - if (writer->type_str == NULL) - return TRUE; - - if (writer->type_pos_is_expectation) - { -#ifndef DBUS_DISABLE_CHECKS - { - int expected; - - expected = _dbus_string_get_byte (writer->type_str, writer->type_pos); - - if (expected != typecode) - { - if (expected != DBUS_TYPE_INVALID) - _dbus_warn_check_failed ("Array or variant type requires that type %s be written, but %s was written.\n" - "The overall signature expected here was '%s' and we are on byte %d of that signature.\n", - _dbus_type_to_string (expected), _dbus_type_to_string (typecode), - _dbus_string_get_const_data (writer->type_str), writer->type_pos); - else - _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" - "The overall signature expected here was '%s' and we are on byte %d of that signature.\n", - _dbus_type_to_string (typecode), - _dbus_string_get_const_data (writer->type_str), writer->type_pos); - _dbus_assert_not_reached ("bad type inserted somewhere inside an array or variant"); - } - } -#endif /* DBUS_DISABLE_CHECKS */ - - /* if immediately inside an array we'd always be appending an element, - * so the expected type doesn't change; if inside a struct or something - * below an array, we need to move through said struct or something. - */ - if (writer->container_type != DBUS_TYPE_ARRAY) - writer->type_pos += 1; - } - else - { - if (!_dbus_string_insert_byte (writer->type_str, - writer->type_pos, - typecode)) - return FALSE; - - writer->type_pos += 1; - } - -#if RECURSIVE_MARSHAL_WRITE_TRACE - _dbus_verbose (" type writer %p write_or_verify end type_pos = %d remaining sig '%s'\n", - writer, writer->type_pos, - _dbus_string_get_const_data_len (writer->type_str, writer->type_pos, 0)); -#endif - - return TRUE; -} - -static dbus_bool_t -writer_recurse_struct_or_dict_entry (DBusTypeWriter *writer, - int begin_char, - const DBusString *contained_type, - int contained_type_start, - int contained_type_len, - DBusTypeWriter *sub) -{ - /* FIXME right now contained_type is ignored; we could probably - * almost trivially fix the code so if it's present we - * write it out and then set type_pos_is_expectation - */ - - /* Ensure that we'll be able to add alignment padding and the typecode */ - if (writer->enabled) - { - if (!_dbus_string_alloc_space (sub->value_str, 8)) - return FALSE; - } - - if (!write_or_verify_typecode (sub, begin_char)) - _dbus_assert_not_reached ("failed to insert struct typecode after prealloc"); - - if (writer->enabled) - { - if (!_dbus_string_insert_bytes (sub->value_str, - sub->value_pos, - _DBUS_ALIGN_VALUE (sub->value_pos, 8) - sub->value_pos, - '\0')) - _dbus_assert_not_reached ("should not have failed to insert alignment padding for struct"); - sub->value_pos = _DBUS_ALIGN_VALUE (sub->value_pos, 8); - } - - return TRUE; -} - - -static dbus_bool_t -writer_recurse_array (DBusTypeWriter *writer, - const DBusString *contained_type, - int contained_type_start, - int contained_type_len, - DBusTypeWriter *sub, - dbus_bool_t is_array_append) -{ - dbus_uint32_t value = 0; - int alignment; - int aligned; - -#ifndef DBUS_DISABLE_CHECKS - if (writer->container_type == DBUS_TYPE_ARRAY && - writer->type_str) - { - if (!_dbus_string_equal_substring (contained_type, - contained_type_start, - contained_type_len, - writer->type_str, - writer->u.array.element_type_pos + 1)) - { - _dbus_warn_check_failed ("Writing an array of '%s' but this is incompatible with the expected type of elements in the parent array\n", - _dbus_string_get_const_data_len (contained_type, - contained_type_start, - contained_type_len)); - _dbus_assert_not_reached ("incompatible type for child array"); - } - } -#endif /* DBUS_DISABLE_CHECKS */ - - if (writer->enabled && !is_array_append) - { - /* 3 pad + 4 bytes for the array length, and 4 bytes possible padding - * before array values - */ - if (!_dbus_string_alloc_space (sub->value_str, 3 + 4 + 4)) - return FALSE; - } - - if (writer->type_str != NULL) - { - sub->type_pos += 1; /* move to point to the element type, since type_pos - * should be the expected type for further writes - */ - sub->u.array.element_type_pos = sub->type_pos; - } - - if (!writer->type_pos_is_expectation) - { - /* sub is a toplevel/outermost array so we need to write the type data */ - - /* alloc space for array typecode, element signature */ - if (!_dbus_string_alloc_space (writer->type_str, 1 + contained_type_len)) - return FALSE; - - if (!_dbus_string_insert_byte (writer->type_str, - writer->type_pos, - DBUS_TYPE_ARRAY)) - _dbus_assert_not_reached ("failed to insert array typecode after prealloc"); - - if (!_dbus_string_copy_len (contained_type, - contained_type_start, contained_type_len, - sub->type_str, - sub->u.array.element_type_pos)) - _dbus_assert_not_reached ("should not have failed to insert array element typecodes"); - } - - if (writer->type_str != NULL) - { - /* If the parent is an array, we hold type_pos pointing at the array element type; - * otherwise advance it to reflect the array value we just recursed into - */ - if (writer->container_type != DBUS_TYPE_ARRAY) - writer->type_pos += 1 + contained_type_len; - else - _dbus_assert (writer->type_pos_is_expectation); /* because it's an array */ - } - - if (writer->enabled) - { - /* Write (or jump over, if is_array_append) the length */ - sub->u.array.len_pos = _DBUS_ALIGN_VALUE (sub->value_pos, 4); - - if (is_array_append) - { - sub->value_pos += 4; - } - else - { - if (!_dbus_type_writer_write_basic_no_typecode (sub, DBUS_TYPE_UINT32, - &value)) - _dbus_assert_not_reached ("should not have failed to insert array len"); - } - - _dbus_assert (sub->u.array.len_pos == sub->value_pos - 4); - - /* Write alignment padding for array elements - * Note that we write the padding *even for empty arrays* - * to avoid wonky special cases - */ - alignment = element_type_get_alignment (contained_type, contained_type_start); - - aligned = _DBUS_ALIGN_VALUE (sub->value_pos, alignment); - if (aligned != sub->value_pos) - { - if (!is_array_append) - { - if (!_dbus_string_insert_bytes (sub->value_str, - sub->value_pos, - aligned - sub->value_pos, - '\0')) - _dbus_assert_not_reached ("should not have failed to insert alignment padding"); - } - - sub->value_pos = aligned; - } - - sub->u.array.start_pos = sub->value_pos; - - if (is_array_append) - { - dbus_uint32_t len; - - _dbus_assert (_DBUS_ALIGN_VALUE (sub->u.array.len_pos, 4) == - (unsigned) sub->u.array.len_pos); - len = _dbus_unpack_uint32 (sub->byte_order, - _dbus_string_get_const_data_len (sub->value_str, - sub->u.array.len_pos, - 4)); - - sub->value_pos += len; - } - } - else - { - /* not enabled, so we won't write the len_pos; set it to -1 to so indicate */ - sub->u.array.len_pos = -1; - sub->u.array.start_pos = sub->value_pos; - } - - _dbus_assert (sub->u.array.len_pos < sub->u.array.start_pos); - _dbus_assert (is_array_append || sub->u.array.start_pos == sub->value_pos); - -#if RECURSIVE_MARSHAL_WRITE_TRACE - _dbus_verbose (" type writer %p recurse array done remaining sig '%s' array start_pos = %d len_pos = %d value_pos = %d\n", sub, - sub->type_str ? - _dbus_string_get_const_data_len (sub->type_str, sub->type_pos, 0) : - "unknown", - sub->u.array.start_pos, sub->u.array.len_pos, sub->value_pos); -#endif - - return TRUE; -} - -/* Variant value will normally have: - * 1 byte signature length not including nul - * signature typecodes (nul terminated) - * padding to alignment of contained type - * body according to signature - * - * The signature string can only have a single type - * in it but that type may be complex/recursive. - * - * So a typical variant type with the integer 3 will have these - * octets: - * 0x1 'i' '\0' [1 byte padding to alignment boundary] 0x0 0x0 0x0 0x3 - * - * The main world of hurt for writing out a variant is that the type - * string is the same string as the value string. Which means - * inserting to the type string will move the value_pos; and it means - * that inserting to the type string could break type alignment. - */ -static dbus_bool_t -writer_recurse_variant (DBusTypeWriter *writer, - const DBusString *contained_type, - int contained_type_start, - int contained_type_len, - DBusTypeWriter *sub) -{ - int contained_alignment; - - if (writer->enabled) - { - /* Allocate space for the worst case, which is 1 byte sig - * length, nul byte at end of sig, and 7 bytes padding to - * 8-boundary. - */ - if (!_dbus_string_alloc_space (sub->value_str, contained_type_len + 9)) - return FALSE; - } - - /* write VARIANT typecode to the parent's type string */ - if (!write_or_verify_typecode (writer, DBUS_TYPE_VARIANT)) - return FALSE; - - /* If not enabled, mark that we have no type_str anymore ... */ - - if (!writer->enabled) - { - sub->type_str = NULL; - sub->type_pos = -1; - - return TRUE; - } - - /* If we're enabled then continue ... */ - - if (!_dbus_string_insert_byte (sub->value_str, - sub->value_pos, - contained_type_len)) - _dbus_assert_not_reached ("should not have failed to insert variant type sig len"); - - sub->value_pos += 1; - - /* Here we switch over to the expected type sig we're about to write */ - sub->type_str = sub->value_str; - sub->type_pos = sub->value_pos; - - if (!_dbus_string_copy_len (contained_type, contained_type_start, contained_type_len, - sub->value_str, sub->value_pos)) - _dbus_assert_not_reached ("should not have failed to insert variant type sig"); - - sub->value_pos += contained_type_len; - - if (!_dbus_string_insert_byte (sub->value_str, - sub->value_pos, - DBUS_TYPE_INVALID)) - _dbus_assert_not_reached ("should not have failed to insert variant type nul termination"); - - sub->value_pos += 1; - - contained_alignment = _dbus_type_get_alignment (_dbus_first_type_in_signature (contained_type, contained_type_start)); - - if (!_dbus_string_insert_bytes (sub->value_str, - sub->value_pos, - _DBUS_ALIGN_VALUE (sub->value_pos, contained_alignment) - sub->value_pos, - '\0')) - _dbus_assert_not_reached ("should not have failed to insert alignment padding for variant body"); - sub->value_pos = _DBUS_ALIGN_VALUE (sub->value_pos, contained_alignment); - - return TRUE; -} - -static dbus_bool_t -_dbus_type_writer_recurse_contained_len (DBusTypeWriter *writer, - int container_type, - const DBusString *contained_type, - int contained_type_start, - int contained_type_len, - DBusTypeWriter *sub, - dbus_bool_t is_array_append) -{ - writer_recurse_init_and_check (writer, container_type, sub); - - switch (container_type) - { - case DBUS_TYPE_STRUCT: - return writer_recurse_struct_or_dict_entry (writer, - DBUS_STRUCT_BEGIN_CHAR, - contained_type, - contained_type_start, contained_type_len, - sub); - break; - case DBUS_TYPE_DICT_ENTRY: - return writer_recurse_struct_or_dict_entry (writer, - DBUS_DICT_ENTRY_BEGIN_CHAR, - contained_type, - contained_type_start, contained_type_len, - sub); - break; - case DBUS_TYPE_ARRAY: - return writer_recurse_array (writer, - contained_type, contained_type_start, contained_type_len, - sub, is_array_append); - break; - case DBUS_TYPE_VARIANT: - return writer_recurse_variant (writer, - contained_type, contained_type_start, contained_type_len, - sub); - break; - default: - _dbus_assert_not_reached ("tried to recurse into type that doesn't support that"); - return FALSE; - break; - } -} - -/** - * Opens a new container and writes out the initial information for that container. - * - * @param writer the writer - * @param container_type the type of the container to open - * @param contained_type the array element type or variant content type - * @param contained_type_start position to look for the type - * @param sub the new sub-writer to write container contents - * @returns #FALSE if no memory - */ -dbus_bool_t -_dbus_type_writer_recurse (DBusTypeWriter *writer, - int container_type, - const DBusString *contained_type, - int contained_type_start, - DBusTypeWriter *sub) -{ - int contained_type_len; - - if (contained_type) - contained_type_len = find_len_of_complete_type (contained_type, contained_type_start); - else - contained_type_len = 0; - - return _dbus_type_writer_recurse_contained_len (writer, container_type, - contained_type, - contained_type_start, - contained_type_len, - sub, - FALSE); -} - -/** - * Append to an existing array. Essentially, the writer will read an - * existing length at the write location; jump over that length; and - * write new fields. On unrecurse(), the existing length will be - * updated. - * - * @param writer the writer - * @param contained_type element type - * @param contained_type_start position of element type - * @param sub the subwriter to init - * @returns #FALSE if no memory - */ -dbus_bool_t -_dbus_type_writer_append_array (DBusTypeWriter *writer, - const DBusString *contained_type, - int contained_type_start, - DBusTypeWriter *sub) -{ - int contained_type_len; - - if (contained_type) - contained_type_len = find_len_of_complete_type (contained_type, contained_type_start); - else - contained_type_len = 0; - - return _dbus_type_writer_recurse_contained_len (writer, DBUS_TYPE_ARRAY, - contained_type, - contained_type_start, - contained_type_len, - sub, - TRUE); -} - -static int -writer_get_array_len (DBusTypeWriter *writer) -{ - _dbus_assert (writer->container_type == DBUS_TYPE_ARRAY); - return writer->value_pos - writer->u.array.start_pos; -} - -/** - * Closes a container created by _dbus_type_writer_recurse() - * and writes any additional information to the values block. - * - * @param writer the writer - * @param sub the sub-writer created by _dbus_type_writer_recurse() - * @returns #FALSE if no memory - */ -dbus_bool_t -_dbus_type_writer_unrecurse (DBusTypeWriter *writer, - DBusTypeWriter *sub) -{ - /* type_pos_is_expectation never gets unset once set, or we'd get all hosed */ - _dbus_assert (!writer->type_pos_is_expectation || - (writer->type_pos_is_expectation && sub->type_pos_is_expectation)); - -#if RECURSIVE_MARSHAL_WRITE_TRACE - _dbus_verbose (" type writer %p unrecurse type_pos = %d value_pos = %d is_expectation = %d container_type = %s\n", - writer, writer->type_pos, writer->value_pos, writer->type_pos_is_expectation, - _dbus_type_to_string (writer->container_type)); - _dbus_verbose (" type writer %p unrecurse sub type_pos = %d value_pos = %d is_expectation = %d container_type = %s\n", - sub, sub->type_pos, sub->value_pos, - sub->type_pos_is_expectation, - _dbus_type_to_string (sub->container_type)); -#endif - - if (sub->container_type == DBUS_TYPE_STRUCT) - { - if (!write_or_verify_typecode (sub, DBUS_STRUCT_END_CHAR)) - return FALSE; - } - else if (sub->container_type == DBUS_TYPE_DICT_ENTRY) - { - if (!write_or_verify_typecode (sub, DBUS_DICT_ENTRY_END_CHAR)) - return FALSE; - } - else if (sub->container_type == DBUS_TYPE_ARRAY) - { - if (sub->u.array.len_pos >= 0) /* len_pos == -1 if we weren't enabled when we passed it */ - { - dbus_uint32_t len; - - /* Set the array length */ - len = writer_get_array_len (sub); - _dbus_marshal_set_uint32 (sub->value_str, - sub->u.array.len_pos, - len, - sub->byte_order); -#if RECURSIVE_MARSHAL_WRITE_TRACE - _dbus_verbose (" filled in sub array len to %u at len_pos %d\n", - len, sub->u.array.len_pos); -#endif - } -#if RECURSIVE_MARSHAL_WRITE_TRACE - else - { - _dbus_verbose (" not filling in sub array len because we were disabled when we passed the len\n"); - } -#endif - } - - /* Now get type_pos right for the parent writer. Here are the cases: - * - * Cases !writer->type_pos_is_expectation: - * (in these cases we want to update to the new insertion point) - * - * - if we recursed into a STRUCT then we didn't know in advance - * what the types in the struct would be; so we have to fill in - * that information now. - * writer->type_pos = sub->type_pos - * - * - if we recursed into anything else, we knew the full array - * type, or knew the single typecode marking VARIANT, so - * writer->type_pos is already correct. - * writer->type_pos should remain as-is - * - * - note that the parent is never an ARRAY or VARIANT, if it were - * then type_pos_is_expectation would be TRUE. The parent - * is thus known to be a toplevel or STRUCT. - * - * Cases where writer->type_pos_is_expectation: - * (in these cases we want to update to next expected type to write) - * - * - we recursed from STRUCT into STRUCT and we didn't increment - * type_pos in the parent just to stay consistent with the - * !writer->type_pos_is_expectation case (though we could - * special-case this in recurse_struct instead if we wanted) - * writer->type_pos = sub->type_pos - * - * - we recursed from STRUCT into ARRAY or VARIANT and type_pos - * for parent should have been incremented already - * writer->type_pos should remain as-is - * - * - we recursed from ARRAY into a sub-element, so type_pos in the - * parent is the element type and should remain the element type - * for the benefit of the next child element - * writer->type_pos should remain as-is - * - * - we recursed from VARIANT into its value, so type_pos in the - * parent makes no difference since there's only one value - * and we just finished writing it and won't use type_pos again - * writer->type_pos should remain as-is - * - * - * For all these, DICT_ENTRY is the same as STRUCT - */ - if (writer->type_str != NULL) - { - if ((sub->container_type == DBUS_TYPE_STRUCT || - sub->container_type == DBUS_TYPE_DICT_ENTRY) && - (writer->container_type == DBUS_TYPE_STRUCT || - writer->container_type == DBUS_TYPE_DICT_ENTRY || - writer->container_type == DBUS_TYPE_INVALID)) - { - /* Advance the parent to the next struct field */ - writer->type_pos = sub->type_pos; - } - } - - writer->value_pos = sub->value_pos; - -#if RECURSIVE_MARSHAL_WRITE_TRACE - _dbus_verbose (" type writer %p unrecursed type_pos = %d value_pos = %d remaining sig '%s'\n", - writer, writer->type_pos, writer->value_pos, - writer->type_str ? - _dbus_string_get_const_data_len (writer->type_str, writer->type_pos, 0) : - "unknown"); -#endif - - return TRUE; -} - -/** - * Writes out a basic type. - * - * @param writer the writer - * @param type the type to write - * @param value the address of the value to write - * @returns #FALSE if no memory - */ -dbus_bool_t -_dbus_type_writer_write_basic (DBusTypeWriter *writer, - int type, - const void *value) -{ - dbus_bool_t retval; - - /* First ensure that our type realloc will succeed */ - if (!writer->type_pos_is_expectation && writer->type_str != NULL) - { - if (!_dbus_string_alloc_space (writer->type_str, 1)) - return FALSE; - } - - retval = FALSE; - - if (!_dbus_type_writer_write_basic_no_typecode (writer, type, value)) - goto out; - - if (!write_or_verify_typecode (writer, type)) - _dbus_assert_not_reached ("failed to write typecode after prealloc"); - - retval = TRUE; - - out: -#if RECURSIVE_MARSHAL_WRITE_TRACE - _dbus_verbose (" type writer %p basic type_pos = %d value_pos = %d is_expectation = %d enabled = %d\n", - writer, writer->type_pos, writer->value_pos, writer->type_pos_is_expectation, - writer->enabled); -#endif - - return retval; -} - -/** - * Writes a block of fixed-length basic values, i.e. those that are - * both dbus_type_is_fixed() and _dbus_type_is_basic(). The block - * must be written inside an array. - * - * The value parameter should be the address of said array of values, - * so e.g. if it's an array of double, pass in "const double**" - * - * @param writer the writer - * @param element_type type of stuff in the array - * @param value address of the array - * @param n_elements number of elements in the array - * @returns #FALSE if no memory - */ -dbus_bool_t -_dbus_type_writer_write_fixed_multi (DBusTypeWriter *writer, - int element_type, - const void *value, - int n_elements) -{ - _dbus_assert (writer->container_type == DBUS_TYPE_ARRAY); - _dbus_assert (dbus_type_is_fixed (element_type)); - _dbus_assert (writer->type_pos_is_expectation); - _dbus_assert (n_elements >= 0); - -#if RECURSIVE_MARSHAL_WRITE_TRACE - _dbus_verbose (" type writer %p entering fixed multi type_pos = %d value_pos = %d n_elements %d\n", - writer, writer->type_pos, writer->value_pos, n_elements); -#endif - - if (!write_or_verify_typecode (writer, element_type)) - _dbus_assert_not_reached ("OOM should not happen if only verifying typecode"); - - if (writer->enabled) - { - if (!_dbus_marshal_write_fixed_multi (writer->value_str, - writer->value_pos, - element_type, - value, - n_elements, - writer->byte_order, - &writer->value_pos)) - return FALSE; - } - -#if RECURSIVE_MARSHAL_WRITE_TRACE - _dbus_verbose (" type writer %p fixed multi written new type_pos = %d new value_pos = %d n_elements %d\n", - writer, writer->type_pos, writer->value_pos, n_elements); -#endif - - return TRUE; -} - -static void -enable_if_after (DBusTypeWriter *writer, - DBusTypeReader *reader, - const DBusTypeReader *start_after) -{ - if (start_after) - { - if (!writer->enabled && _dbus_type_reader_greater_than (reader, start_after)) - { - _dbus_type_writer_set_enabled (writer, TRUE); -#if RECURSIVE_MARSHAL_WRITE_TRACE - _dbus_verbose ("ENABLING writer %p at %d because reader at value_pos %d is after reader at value_pos %d\n", - writer, writer->value_pos, reader->value_pos, start_after->value_pos); -#endif - } - - _dbus_assert ((!writer->enabled && !_dbus_type_reader_greater_than (reader, start_after)) || - (writer->enabled && _dbus_type_reader_greater_than (reader, start_after))); - } -} - -static dbus_bool_t -append_fixup (DBusList **fixups, - const DBusArrayLenFixup *fixup) -{ - DBusArrayLenFixup *f; - - f = dbus_new (DBusArrayLenFixup, 1); - if (f == NULL) - return FALSE; - - *f = *fixup; - - if (!_dbus_list_append (fixups, f)) - { - dbus_free (f); - return FALSE; - } - - _dbus_assert (f->len_pos_in_reader == fixup->len_pos_in_reader); - _dbus_assert (f->new_len == fixup->new_len); - - return TRUE; -} - -/* This loop is trivial if you ignore all the start_after nonsense, - * so if you're trying to figure it out, start by ignoring that - */ -static dbus_bool_t -writer_write_reader_helper (DBusTypeWriter *writer, - DBusTypeReader *reader, - const DBusTypeReader *start_after, - int start_after_new_pos, - int start_after_new_len, - DBusList **fixups, - dbus_bool_t inside_start_after) -{ - int current_type; - - while ((current_type = _dbus_type_reader_get_current_type (reader)) != DBUS_TYPE_INVALID) - { - if (dbus_type_is_container (current_type)) - { - DBusTypeReader subreader; - DBusTypeWriter subwriter; - const DBusString *sig_str; - int sig_start; - int sig_len; - dbus_bool_t enabled_at_recurse; - dbus_bool_t past_start_after; - int reader_array_len_pos; - int reader_array_start_pos; - dbus_bool_t this_is_start_after; - - /* type_pos is checked since e.g. in a struct the struct - * and its first field have the same value_pos. - * type_str will differ in reader/start_after for variants - * where type_str is inside the value_str - */ - if (!inside_start_after && start_after && - reader->value_pos == start_after->value_pos && - reader->type_str == start_after->type_str && - reader->type_pos == start_after->type_pos) - this_is_start_after = TRUE; - else - this_is_start_after = FALSE; - - _dbus_type_reader_recurse (reader, &subreader); - - if (current_type == DBUS_TYPE_ARRAY) - { - reader_array_len_pos = ARRAY_READER_LEN_POS (&subreader); - reader_array_start_pos = subreader.u.array.start_pos; - } - else - { - /* quiet gcc */ - reader_array_len_pos = -1; - reader_array_start_pos = -1; - } - - _dbus_type_reader_get_signature (&subreader, &sig_str, - &sig_start, &sig_len); - -#if RECURSIVE_MARSHAL_WRITE_TRACE - _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", - _dbus_type_to_string (current_type), - reader->value_pos, - subreader.value_pos, - writer->value_pos, - start_after ? start_after->value_pos : -1, - _dbus_string_get_length (writer->value_str), - inside_start_after, this_is_start_after); -#endif - - if (!inside_start_after && !this_is_start_after) - enable_if_after (writer, &subreader, start_after); - enabled_at_recurse = writer->enabled; - if (!_dbus_type_writer_recurse_contained_len (writer, current_type, - sig_str, sig_start, sig_len, - &subwriter, FALSE)) - goto oom; - -#if RECURSIVE_MARSHAL_WRITE_TRACE - _dbus_verbose ("recursed into subwriter at %d write target len %d\n", - subwriter.value_pos, - _dbus_string_get_length (subwriter.value_str)); -#endif - - if (!writer_write_reader_helper (&subwriter, &subreader, start_after, - start_after_new_pos, start_after_new_len, - fixups, - inside_start_after || - this_is_start_after)) - goto oom; - -#if RECURSIVE_MARSHAL_WRITE_TRACE - _dbus_verbose ("about to unrecurse from %s subreader at %d writer at %d subwriter at %d write target len %d\n", - _dbus_type_to_string (current_type), - subreader.value_pos, - writer->value_pos, - subwriter.value_pos, - _dbus_string_get_length (writer->value_str)); -#endif - - if (!inside_start_after && !this_is_start_after) - enable_if_after (writer, &subreader, start_after); - past_start_after = writer->enabled; - if (!_dbus_type_writer_unrecurse (writer, &subwriter)) - goto oom; - - /* If we weren't enabled when we recursed, we didn't - * write an array len; if we passed start_after - * somewhere inside the array, then we need to generate - * a fixup. - */ - if (start_after != NULL && - !enabled_at_recurse && past_start_after && - current_type == DBUS_TYPE_ARRAY && - fixups != NULL) - { - DBusArrayLenFixup fixup; - int bytes_written_after_start_after; - int bytes_before_start_after; - int old_len; - - /* this subwriter access is moderately unkosher since we - * already unrecursed, but it works as long as unrecurse - * doesn't break us on purpose - */ - bytes_written_after_start_after = writer_get_array_len (&subwriter); - - bytes_before_start_after = - start_after->value_pos - reader_array_start_pos; - - fixup.len_pos_in_reader = reader_array_len_pos; - fixup.new_len = - bytes_before_start_after + - start_after_new_len + - bytes_written_after_start_after; - - _dbus_assert (_DBUS_ALIGN_VALUE (fixup.len_pos_in_reader, 4) == - (unsigned) fixup.len_pos_in_reader); - - old_len = _dbus_unpack_uint32 (reader->byte_order, - _dbus_string_get_const_data_len (reader->value_str, - fixup.len_pos_in_reader, 4)); - - if (old_len != fixup.new_len && !append_fixup (fixups, &fixup)) - goto oom; - -#if RECURSIVE_MARSHAL_WRITE_TRACE - _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", - fixup.len_pos_in_reader, - fixup.new_len, - reader_array_start_pos, - start_after->value_pos, - bytes_before_start_after, - start_after_new_len, - bytes_written_after_start_after); -#endif - } - } - else - { - DBusBasicValue val; - - _dbus_assert (dbus_type_is_basic (current_type)); - -#if RECURSIVE_MARSHAL_WRITE_TRACE - _dbus_verbose ("Reading basic value %s at %d\n", - _dbus_type_to_string (current_type), - reader->value_pos); -#endif - - _dbus_type_reader_read_basic (reader, &val); - -#if RECURSIVE_MARSHAL_WRITE_TRACE - _dbus_verbose ("Writing basic value %s at %d write target len %d inside_start_after = %d\n", - _dbus_type_to_string (current_type), - writer->value_pos, - _dbus_string_get_length (writer->value_str), - inside_start_after); -#endif - if (!inside_start_after) - enable_if_after (writer, reader, start_after); - if (!_dbus_type_writer_write_basic (writer, current_type, &val)) - goto oom; -#if RECURSIVE_MARSHAL_WRITE_TRACE - _dbus_verbose ("Wrote basic value %s, new value_pos %d write target len %d\n", - _dbus_type_to_string (current_type), - writer->value_pos, - _dbus_string_get_length (writer->value_str)); -#endif - } - - _dbus_type_reader_next (reader); - } - - return TRUE; - - oom: - if (fixups) - apply_and_free_fixups (fixups, NULL); /* NULL for reader to apply to */ - - return FALSE; -} - -/* - * Iterate through all values in the given reader, writing a copy of - * each value to the writer. The reader will be moved forward to its - * end position. - * - * If a reader start_after is provided, it should be a reader for the - * same data as the reader to be written. Only values occurring after - * the value pointed to by start_after will be written to the writer. - * - * If start_after is provided, then the copy of the reader will be - * partial. This means that array lengths will not have been copied. - * The assumption is that you wrote a new version of the value at - * start_after to the writer. You have to pass in the start position - * and length of the new value. (If you are deleting the value - * at start_after, pass in 0 for the length.) - * - * If the fixups parameter is non-#NULL, then any array length that - * was read but not written due to start_after will be provided - * as a #DBusArrayLenFixup. The fixup contains the position of the - * array length in the source data, and the correct array length - * assuming you combine the source data before start_after with - * the written data at start_after and beyond. - * - * @param writer the writer to copy to - * @param reader the reader to copy from - * @param start_after #NULL or a reader showing where to start - * @param start_after_new_pos the position of start_after equivalent in the target data - * @param start_after_new_len the length of start_after equivalent in the target data - * @param fixups list to append #DBusArrayLenFixup if the write was partial - * @returns #FALSE if no memory - */ -static dbus_bool_t -_dbus_type_writer_write_reader_partial (DBusTypeWriter *writer, - DBusTypeReader *reader, - const DBusTypeReader *start_after, - int start_after_new_pos, - int start_after_new_len, - DBusList **fixups) -{ - DBusTypeWriter orig; - int orig_type_len; - int orig_value_len; - int new_bytes; - int orig_enabled; - - orig = *writer; - orig_type_len = _dbus_string_get_length (writer->type_str); - orig_value_len = _dbus_string_get_length (writer->value_str); - orig_enabled = writer->enabled; - - if (start_after) - _dbus_type_writer_set_enabled (writer, FALSE); - - if (!writer_write_reader_helper (writer, reader, start_after, - start_after_new_pos, - start_after_new_len, - fixups, FALSE)) - goto oom; - - _dbus_type_writer_set_enabled (writer, orig_enabled); - return TRUE; - - oom: - if (!writer->type_pos_is_expectation) - { - new_bytes = _dbus_string_get_length (writer->type_str) - orig_type_len; - _dbus_string_delete (writer->type_str, orig.type_pos, new_bytes); - } - new_bytes = _dbus_string_get_length (writer->value_str) - orig_value_len; - _dbus_string_delete (writer->value_str, orig.value_pos, new_bytes); - - *writer = orig; - - return FALSE; -} - -/** - * Iterate through all values in the given reader, writing a copy of - * each value to the writer. The reader will be moved forward to its - * end position. - * - * @param writer the writer to copy to - * @param reader the reader to copy from - * @returns #FALSE if no memory - */ -dbus_bool_t -_dbus_type_writer_write_reader (DBusTypeWriter *writer, - DBusTypeReader *reader) -{ - return _dbus_type_writer_write_reader_partial (writer, reader, NULL, 0, 0, NULL); -} - -/* - * If disabled, a writer can still be iterated forward and recursed/unrecursed - * but won't write any values. Types will still be written unless the - * writer is a "values only" writer, because the writer needs access to - * a valid signature to be able to iterate. - * - * @param writer the type writer - * @param enabled #TRUE if values should be written - */ -static void -_dbus_type_writer_set_enabled (DBusTypeWriter *writer, - dbus_bool_t enabled) -{ - writer->enabled = enabled != FALSE; -} - -/** @} */ /* end of DBusMarshal group */ - -/* tests in dbus-marshal-recursive-util.c */ |