--- /dev/null
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
+/* dbus-message.c DBusMessage object
+ *
+ * Copyright (C) 2002, 2003, 2004, 2005 Red Hat Inc.
+ * Copyright (C) 2002, 2003 CodeFactory AB
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include "dbus-internals.h"
+#include "dbus-marshal-recursive.h"
+#include "dbus-marshal-validate.h"
+#include "dbus-marshal-byteswap.h"
+#include "dbus-marshal-header.h"
+#include "dbus-signature.h"
+#include "dbus-message-private.h"
+#include "dbus-object-tree.h"
+#include "dbus-memory.h"
+#include "dbus-list.h"
+#include "dbus-threads-internal.h"
+#include <string.h>
+
+static void dbus_message_finalize (DBusMessage *message);
+
+/**
+ * @defgroup DBusMessageInternals DBusMessage implementation details
+ * @ingroup DBusInternals
+ * @brief DBusMessage private implementation details.
+ *
+ * The guts of DBusMessage and its methods.
+ *
+ * @{
+ */
+
+/* Not thread locked, but strictly const/read-only so should be OK
+ */
+/** An static string representing an empty signature */
+_DBUS_STRING_DEFINE_STATIC(_dbus_empty_signature_str, "");
+
+/* these have wacky values to help trap uninitialized iterators;
+ * but has to fit in 3 bits
+ */
+enum {
+ DBUS_MESSAGE_ITER_TYPE_READER = 3,
+ DBUS_MESSAGE_ITER_TYPE_WRITER = 7
+};
+
+/** typedef for internals of message iterator */
+typedef struct DBusMessageRealIter DBusMessageRealIter;
+
+/**
+ * @brief Internals of DBusMessageIter
+ *
+ * Object representing a position in a message. All fields are internal.
+ */
+struct DBusMessageRealIter
+{
+ DBusMessage *message; /**< Message used */
+ dbus_uint32_t changed_stamp : CHANGED_STAMP_BITS; /**< stamp to detect invalid iters */
+ dbus_uint32_t iter_type : 3; /**< whether this is a reader or writer iter */
+ dbus_uint32_t sig_refcount : 8; /**< depth of open_signature() */
+ union
+ {
+ DBusTypeWriter writer; /**< writer */
+ DBusTypeReader reader; /**< reader */
+ } u; /**< the type writer or reader that does all the work */
+};
+
+static void
+get_const_signature (DBusHeader *header,
+ const DBusString **type_str_p,
+ int *type_pos_p)
+{
+ if (_dbus_header_get_field_raw (header,
+ DBUS_HEADER_FIELD_SIGNATURE,
+ type_str_p,
+ type_pos_p))
+ {
+ *type_pos_p += 1; /* skip the signature length which is 1 byte */
+ }
+ else
+ {
+ *type_str_p = &_dbus_empty_signature_str;
+ *type_pos_p = 0;
+ }
+}
+
+/**
+ * Swaps the message to compiler byte order if required
+ *
+ * @param message the message
+ */
+static void
+_dbus_message_byteswap (DBusMessage *message)
+{
+ const DBusString *type_str;
+ int type_pos;
+
+ if (message->byte_order == DBUS_COMPILER_BYTE_ORDER)
+ return;
+
+ _dbus_verbose ("Swapping message into compiler byte order\n");
+
+ get_const_signature (&message->header, &type_str, &type_pos);
+
+ _dbus_marshal_byteswap (type_str, type_pos,
+ message->byte_order,
+ DBUS_COMPILER_BYTE_ORDER,
+ &message->body, 0);
+
+ message->byte_order = DBUS_COMPILER_BYTE_ORDER;
+
+ _dbus_header_byteswap (&message->header, DBUS_COMPILER_BYTE_ORDER);
+}
+
+/** byte-swap the message if it doesn't match our byte order.
+ * Called only when we need the message in our own byte order,
+ * normally when reading arrays of integers or doubles.
+ * Otherwise should not be called since it would do needless
+ * work.
+ */
+#define ensure_byte_order(message) \
+ if (message->byte_order != DBUS_COMPILER_BYTE_ORDER) \
+ _dbus_message_byteswap (message)
+
+/**
+ * Gets the data to be sent over the network for this message.
+ * The header and then the body should be written out.
+ * This function is guaranteed to always return the same
+ * data once a message is locked (with dbus_message_lock()).
+ *
+ * @param message the message.
+ * @param header return location for message header data.
+ * @param body return location for message body data.
+ */
+void
+_dbus_message_get_network_data (DBusMessage *message,
+ const DBusString **header,
+ const DBusString **body)
+{
+ _dbus_assert (message->locked);
+
+ *header = &message->header.data;
+ *body = &message->body;
+}
+
+/**
+ * Sets the serial number of a message.
+ * This can only be done once on a message.
+ *
+ * DBusConnection will automatically set the serial to an appropriate value
+ * when the message is sent; this function is only needed when encapsulating
+ * messages in another protocol, or otherwise bypassing DBusConnection.
+ *
+ * @param message the message
+ * @param serial the serial
+ */
+void
+dbus_message_set_serial (DBusMessage *message,
+ dbus_uint32_t serial)
+{
+ _dbus_return_if_fail (message != NULL);
+ _dbus_return_if_fail (!message->locked);
+
+ _dbus_header_set_serial (&message->header, serial);
+}
+
+/**
+ * Adds a counter to be incremented immediately with the
+ * size of this message, and decremented by the size
+ * of this message when this message if finalized.
+ * The link contains a counter with its refcount already
+ * incremented, but the counter itself not incremented.
+ * Ownership of link and counter refcount is passed to
+ * the message.
+ *
+ * @param message the message
+ * @param link link with counter as data
+ */
+void
+_dbus_message_add_size_counter_link (DBusMessage *message,
+ DBusList *link)
+{
+ /* right now we don't recompute the delta when message
+ * size changes, and that's OK for current purposes
+ * I think, but could be important to change later.
+ * Do recompute it whenever there are no outstanding counters,
+ * since it's basically free.
+ */
+ if (message->size_counters == NULL)
+ {
+ message->size_counter_delta =
+ _dbus_string_get_length (&message->header.data) +
+ _dbus_string_get_length (&message->body);
+
+#if 0
+ _dbus_verbose ("message has size %ld\n",
+ message->size_counter_delta);
+#endif
+ }
+
+ _dbus_list_append_link (&message->size_counters, link);
+
+ _dbus_counter_adjust (link->data, message->size_counter_delta);
+}
+
+/**
+ * Adds a counter to be incremented immediately with the
+ * size of this message, and decremented by the size
+ * of this message when this message if finalized.
+ *
+ * @param message the message
+ * @param counter the counter
+ * @returns #FALSE if no memory
+ */
+dbus_bool_t
+_dbus_message_add_size_counter (DBusMessage *message,
+ DBusCounter *counter)
+{
+ DBusList *link;
+
+ link = _dbus_list_alloc_link (counter);
+ if (link == NULL)
+ return FALSE;
+
+ _dbus_counter_ref (counter);
+ _dbus_message_add_size_counter_link (message, link);
+
+ return TRUE;
+}
+
+/**
+ * Removes a counter tracking the size of this message, and decrements
+ * the counter by the size of this message.
+ *
+ * @param message the message
+ * @param link_return return the link used
+ * @param counter the counter
+ */
+void
+_dbus_message_remove_size_counter (DBusMessage *message,
+ DBusCounter *counter,
+ DBusList **link_return)
+{
+ DBusList *link;
+
+ link = _dbus_list_find_last (&message->size_counters,
+ counter);
+ _dbus_assert (link != NULL);
+
+ _dbus_list_unlink (&message->size_counters,
+ link);
+ if (link_return)
+ *link_return = link;
+ else
+ _dbus_list_free_link (link);
+
+ _dbus_counter_adjust (counter, - message->size_counter_delta);
+
+ _dbus_counter_unref (counter);
+}
+
+/**
+ * Locks a message. Allows checking that applications don't keep a
+ * reference to a message in the outgoing queue and change it
+ * underneath us. Messages are locked when they enter the outgoing
+ * queue (dbus_connection_send_message()), and the library complains
+ * if the message is modified while locked. This function may also
+ * called externally, for applications wrapping D-Bus in another protocol.
+ *
+ * @param message the message to lock.
+ */
+void
+dbus_message_lock (DBusMessage *message)
+{
+ if (!message->locked)
+ {
+ _dbus_header_update_lengths (&message->header,
+ _dbus_string_get_length (&message->body));
+
+ /* must have a signature if you have a body */
+ _dbus_assert (_dbus_string_get_length (&message->body) == 0 ||
+ dbus_message_get_signature (message) != NULL);
+
+ message->locked = TRUE;
+ }
+}
+
+static dbus_bool_t
+set_or_delete_string_field (DBusMessage *message,
+ int field,
+ int typecode,
+ const char *value)
+{
+ if (value == NULL)
+ return _dbus_header_delete_field (&message->header, field);
+ else
+ return _dbus_header_set_field_basic (&message->header,
+ field,
+ typecode,
+ &value);
+}
+
+#if 0
+/* Probably we don't need to use this */
+/**
+ * Sets the signature of the message, i.e. the arguments in the
+ * message payload. The signature includes only "in" arguments for
+ * #DBUS_MESSAGE_TYPE_METHOD_CALL and only "out" arguments for
+ * #DBUS_MESSAGE_TYPE_METHOD_RETURN, so is slightly different from
+ * what you might expect (it does not include the signature of the
+ * entire C++-style method).
+ *
+ * The signature is a string made up of type codes such as
+ * #DBUS_TYPE_INT32. The string is terminated with nul (nul is also
+ * the value of #DBUS_TYPE_INVALID). The macros such as
+ * #DBUS_TYPE_INT32 evaluate to integers; to assemble a signature you
+ * may find it useful to use the string forms, such as
+ * #DBUS_TYPE_INT32_AS_STRING.
+ *
+ * An "unset" or #NULL signature is considered the same as an empty
+ * signature. In fact dbus_message_get_signature() will never return
+ * #NULL.
+ *
+ * @param message the message
+ * @param signature the type signature or #NULL to unset
+ * @returns #FALSE if no memory
+ */
+static dbus_bool_t
+_dbus_message_set_signature (DBusMessage *message,
+ const char *signature)
+{
+ _dbus_return_val_if_fail (message != NULL, FALSE);
+ _dbus_return_val_if_fail (!message->locked, FALSE);
+ _dbus_return_val_if_fail (signature == NULL ||
+ _dbus_check_is_valid_signature (signature));
+ /* can't delete the signature if you have a message body */
+ _dbus_return_val_if_fail (_dbus_string_get_length (&message->body) == 0 ||
+ signature != NULL);
+
+ return set_or_delete_string_field (message,
+ DBUS_HEADER_FIELD_SIGNATURE,
+ DBUS_TYPE_SIGNATURE,
+ signature);
+}
+#endif
+
+/* Message Cache
+ *
+ * We cache some DBusMessage to reduce the overhead of allocating
+ * them. In my profiling this consistently made about an 8%
+ * difference. It avoids the malloc for the message, the malloc for
+ * the slot list, the malloc for the header string and body string,
+ * and the associated free() calls. It does introduce another global
+ * lock which could be a performance issue in certain cases.
+ *
+ * For the echo client/server the round trip time goes from around
+ * .000077 to .000069 with the message cache on my laptop. The sysprof
+ * change is as follows (numbers are cumulative percentage):
+ *
+ * with message cache implemented as array as it is now (0.000069 per):
+ * new_empty_header 1.46
+ * mutex_lock 0.56 # i.e. _DBUS_LOCK(message_cache)
+ * mutex_unlock 0.25
+ * self 0.41
+ * unref 2.24
+ * self 0.68
+ * list_clear 0.43
+ * mutex_lock 0.33 # i.e. _DBUS_LOCK(message_cache)
+ * mutex_unlock 0.25
+ *
+ * with message cache implemented as list (0.000070 per roundtrip):
+ * new_empty_header 2.72
+ * list_pop_first 1.88
+ * unref 3.3
+ * list_prepend 1.63
+ *
+ * without cache (0.000077 per roundtrip):
+ * new_empty_header 6.7
+ * string_init_preallocated 3.43
+ * dbus_malloc 2.43
+ * dbus_malloc0 2.59
+ *
+ * unref 4.02
+ * string_free 1.82
+ * dbus_free 1.63
+ * dbus_free 0.71
+ *
+ * If you implement the message_cache with a list, the primary reason
+ * it's slower is that you add another thread lock (on the DBusList
+ * mempool).
+ */
+
+/** Avoid caching huge messages */
+#define MAX_MESSAGE_SIZE_TO_CACHE 10 * _DBUS_ONE_KILOBYTE
+
+/** Avoid caching too many messages */
+#define MAX_MESSAGE_CACHE_SIZE 5
+
+_DBUS_DEFINE_GLOBAL_LOCK (message_cache);
+static DBusMessage *message_cache[MAX_MESSAGE_CACHE_SIZE];
+static int message_cache_count = 0;
+static dbus_bool_t message_cache_shutdown_registered = FALSE;
+
+static void
+dbus_message_cache_shutdown (void *data)
+{
+ int i;
+
+ _DBUS_LOCK (message_cache);
+
+ i = 0;
+ while (i < MAX_MESSAGE_CACHE_SIZE)
+ {
+ if (message_cache[i])
+ dbus_message_finalize (message_cache[i]);
+
+ ++i;
+ }
+
+ message_cache_count = 0;
+ message_cache_shutdown_registered = FALSE;
+
+ _DBUS_UNLOCK (message_cache);
+}
+
+/**
+ * Tries to get a message from the message cache. The retrieved
+ * message will have junk in it, so it still needs to be cleared out
+ * in dbus_message_new_empty_header()
+ *
+ * @returns the message, or #NULL if none cached
+ */
+static DBusMessage*
+dbus_message_get_cached (void)
+{
+ DBusMessage *message;
+ int i;
+
+ message = NULL;
+
+ _DBUS_LOCK (message_cache);
+
+ _dbus_assert (message_cache_count >= 0);
+
+ if (message_cache_count == 0)
+ {
+ _DBUS_UNLOCK (message_cache);
+ return NULL;
+ }
+
+ /* This is not necessarily true unless count > 0, and
+ * message_cache is uninitialized until the shutdown is
+ * registered
+ */
+ _dbus_assert (message_cache_shutdown_registered);
+
+ i = 0;
+ while (i < MAX_MESSAGE_CACHE_SIZE)
+ {
+ if (message_cache[i])
+ {
+ message = message_cache[i];
+ message_cache[i] = NULL;
+ message_cache_count -= 1;
+ break;
+ }
+ ++i;
+ }
+ _dbus_assert (message_cache_count >= 0);
+ _dbus_assert (i < MAX_MESSAGE_CACHE_SIZE);
+ _dbus_assert (message != NULL);
+
+ _dbus_assert (message->refcount.value == 0);
+ _dbus_assert (message->size_counters == NULL);
+
+ _DBUS_UNLOCK (message_cache);
+
+ return message;
+}
+
+static void
+free_size_counter (void *element,
+ void *data)
+{
+ DBusCounter *counter = element;
+ DBusMessage *message = data;
+
+ _dbus_counter_adjust (counter, - message->size_counter_delta);
+
+ _dbus_counter_unref (counter);
+}
+
+/**
+ * Tries to cache a message, otherwise finalize it.
+ *
+ * @param message the message
+ */
+static void
+dbus_message_cache_or_finalize (DBusMessage *message)
+{
+ dbus_bool_t was_cached;
+ int i;
+
+ _dbus_assert (message->refcount.value == 0);
+
+ /* This calls application code and has to be done first thing
+ * without holding the lock
+ */
+ _dbus_data_slot_list_clear (&message->slot_list);
+
+ _dbus_list_foreach (&message->size_counters,
+ free_size_counter, message);
+ _dbus_list_clear (&message->size_counters);
+
+ was_cached = FALSE;
+
+ _DBUS_LOCK (message_cache);
+
+ if (!message_cache_shutdown_registered)
+ {
+ _dbus_assert (message_cache_count == 0);
+
+ if (!_dbus_register_shutdown_func (dbus_message_cache_shutdown, NULL))
+ goto out;
+
+ i = 0;
+ while (i < MAX_MESSAGE_CACHE_SIZE)
+ {
+ message_cache[i] = NULL;
+ ++i;
+ }
+
+ message_cache_shutdown_registered = TRUE;
+ }
+
+ _dbus_assert (message_cache_count >= 0);
+
+ if ((_dbus_string_get_length (&message->header.data) +
+ _dbus_string_get_length (&message->body)) >
+ MAX_MESSAGE_SIZE_TO_CACHE)
+ goto out;
+
+ if (message_cache_count >= MAX_MESSAGE_CACHE_SIZE)
+ goto out;
+
+ /* Find empty slot */
+ i = 0;
+ while (message_cache[i] != NULL)
+ ++i;
+
+ _dbus_assert (i < MAX_MESSAGE_CACHE_SIZE);
+
+ _dbus_assert (message_cache[i] == NULL);
+ message_cache[i] = message;
+ message_cache_count += 1;
+ was_cached = TRUE;
+#ifndef DBUS_DISABLE_CHECKS
+ message->in_cache = TRUE;
+#endif
+
+ out:
+ _dbus_assert (message->refcount.value == 0);
+
+ _DBUS_UNLOCK (message_cache);
+
+ if (!was_cached)
+ dbus_message_finalize (message);
+}
+
+#ifndef DBUS_DISABLE_CHECKS
+static dbus_bool_t
+_dbus_message_iter_check (DBusMessageRealIter *iter)
+{
+ if (iter == NULL)
+ {
+ _dbus_warn_check_failed ("dbus message iterator is NULL\n");
+ return FALSE;
+ }
+
+ if (iter->iter_type == DBUS_MESSAGE_ITER_TYPE_READER)
+ {
+ if (iter->u.reader.byte_order != iter->message->byte_order)
+ {
+ _dbus_warn_check_failed ("dbus message changed byte order since iterator was created\n");
+ return FALSE;
+ }
+ /* because we swap the message into compiler order when you init an iter */
+ _dbus_assert (iter->u.reader.byte_order == DBUS_COMPILER_BYTE_ORDER);
+ }
+ else if (iter->iter_type == DBUS_MESSAGE_ITER_TYPE_WRITER)
+ {
+ if (iter->u.writer.byte_order != iter->message->byte_order)
+ {
+ _dbus_warn_check_failed ("dbus message changed byte order since append iterator was created\n");
+ return FALSE;
+ }
+ /* because we swap the message into compiler order when you init an iter */
+ _dbus_assert (iter->u.writer.byte_order == DBUS_COMPILER_BYTE_ORDER);
+ }
+ else
+ {
+ _dbus_warn_check_failed ("dbus message iterator looks uninitialized or corrupted\n");
+ return FALSE;
+ }
+
+ if (iter->changed_stamp != iter->message->changed_stamp)
+ {
+ _dbus_warn_check_failed ("dbus message iterator invalid because the message has been modified (or perhaps the iterator is just uninitialized)\n");
+ return FALSE;
+ }
+
+ return TRUE;
+}
+#endif /* DBUS_DISABLE_CHECKS */
+
+/**
+ * Implementation of the varargs arg-getting functions.
+ * dbus_message_get_args() is the place to go for complete
+ * documentation.
+ *
+ * @see dbus_message_get_args
+ * @param iter the message iter
+ * @param error error to be filled in
+ * @param first_arg_type type of the first argument
+ * @param var_args return location for first argument, followed by list of type/location pairs
+ * @returns #FALSE if error was set
+ */
+dbus_bool_t
+_dbus_message_iter_get_args_valist (DBusMessageIter *iter,
+ DBusError *error,
+ int first_arg_type,
+ va_list var_args)
+{
+ DBusMessageRealIter *real = (DBusMessageRealIter *)iter;
+ int spec_type, msg_type, i;
+ dbus_bool_t retval;
+
+ _dbus_assert (_dbus_message_iter_check (real));
+
+ retval = FALSE;
+
+ spec_type = first_arg_type;
+ i = 0;
+
+ while (spec_type != DBUS_TYPE_INVALID)
+ {
+ msg_type = dbus_message_iter_get_arg_type (iter);
+
+ if (msg_type != spec_type)
+ {
+ dbus_set_error (error, DBUS_ERROR_INVALID_ARGS,
+ "Argument %d is specified to be of type \"%s\", but "
+ "is actually of type \"%s\"\n", i,
+ _dbus_type_to_string (spec_type),
+ _dbus_type_to_string (msg_type));
+
+ goto out;
+ }
+
+ if (dbus_type_is_basic (spec_type))
+ {
+ DBusBasicValue *ptr;
+
+ ptr = va_arg (var_args, DBusBasicValue*);
+
+ _dbus_assert (ptr != NULL);
+
+ _dbus_type_reader_read_basic (&real->u.reader,
+ ptr);
+ }
+ else if (spec_type == DBUS_TYPE_ARRAY)
+ {
+ int element_type;
+ int spec_element_type;
+ const DBusBasicValue **ptr;
+ int *n_elements_p;
+ DBusTypeReader array;
+
+ spec_element_type = va_arg (var_args, int);
+ element_type = _dbus_type_reader_get_element_type (&real->u.reader);
+
+ if (spec_element_type != element_type)
+ {
+ dbus_set_error (error, DBUS_ERROR_INVALID_ARGS,
+ "Argument %d is specified to be an array of \"%s\", but "
+ "is actually an array of \"%s\"\n",
+ i,
+ _dbus_type_to_string (spec_element_type),
+ _dbus_type_to_string (element_type));
+
+ goto out;
+ }
+
+ if (dbus_type_is_fixed (spec_element_type))
+ {
+ ptr = va_arg (var_args, const DBusBasicValue**);
+ n_elements_p = va_arg (var_args, int*);
+
+ _dbus_assert (ptr != NULL);
+ _dbus_assert (n_elements_p != NULL);
+
+ _dbus_type_reader_recurse (&real->u.reader, &array);
+
+ _dbus_type_reader_read_fixed_multi (&array,
+ ptr, n_elements_p);
+ }
+ else if (spec_element_type == DBUS_TYPE_STRING ||
+ spec_element_type == DBUS_TYPE_SIGNATURE ||
+ spec_element_type == DBUS_TYPE_OBJECT_PATH)
+ {
+ char ***str_array_p;
+ int n_elements;
+ char **str_array;
+
+ str_array_p = va_arg (var_args, char***);
+ n_elements_p = va_arg (var_args, int*);
+
+ _dbus_assert (str_array_p != NULL);
+ _dbus_assert (n_elements_p != NULL);
+
+ /* Count elements in the array */
+ _dbus_type_reader_recurse (&real->u.reader, &array);
+
+ n_elements = 0;
+ while (_dbus_type_reader_get_current_type (&array) != DBUS_TYPE_INVALID)
+ {
+ ++n_elements;
+ _dbus_type_reader_next (&array);
+ }
+
+ str_array = dbus_new0 (char*, n_elements + 1);
+ if (str_array == NULL)
+ {
+ _DBUS_SET_OOM (error);
+ goto out;
+ }
+
+ /* Now go through and dup each string */
+ _dbus_type_reader_recurse (&real->u.reader, &array);
+
+ i = 0;
+ while (i < n_elements)
+ {
+ const char *s;
+ _dbus_type_reader_read_basic (&array,
+ &s);
+
+ str_array[i] = _dbus_strdup (s);
+ if (str_array[i] == NULL)
+ {
+ dbus_free_string_array (str_array);
+ _DBUS_SET_OOM (error);
+ goto out;
+ }
+
+ ++i;
+
+ if (!_dbus_type_reader_next (&array))
+ _dbus_assert (i == n_elements);
+ }
+
+ _dbus_assert (_dbus_type_reader_get_current_type (&array) == DBUS_TYPE_INVALID);
+ _dbus_assert (i == n_elements);
+ _dbus_assert (str_array[i] == NULL);
+
+ *str_array_p = str_array;
+ *n_elements_p = n_elements;
+ }
+#ifndef DBUS_DISABLE_CHECKS
+ else
+ {
+ _dbus_warn ("you can't read arrays of container types (struct, variant, array) with %s for now\n",
+ _DBUS_FUNCTION_NAME);
+ goto out;
+ }
+#endif
+ }
+#ifndef DBUS_DISABLE_CHECKS
+ else
+ {
+ _dbus_warn ("you can only read arrays and basic types with %s for now\n",
+ _DBUS_FUNCTION_NAME);
+ goto out;
+ }
+#endif
+
+ spec_type = va_arg (var_args, int);
+ if (!_dbus_type_reader_next (&real->u.reader) && spec_type != DBUS_TYPE_INVALID)
+ {
+ dbus_set_error (error, DBUS_ERROR_INVALID_ARGS,
+ "Message has only %d arguments, but more were expected", i);
+ goto out;
+ }
+
+ i++;
+ }
+
+ retval = TRUE;
+
+ out:
+
+ return retval;
+}
+
+/** @} */
+
+/**
+ * @defgroup DBusMessage DBusMessage
+ * @ingroup DBus
+ * @brief Message to be sent or received over a #DBusConnection.
+ *
+ * A DBusMessage is the most basic unit of communication over a
+ * DBusConnection. A DBusConnection represents a stream of messages
+ * received from a remote application, and a stream of messages
+ * sent to a remote application.
+ *
+ * A message has a message type, returned from
+ * dbus_message_get_type(). This indicates whether the message is a
+ * method call, a reply to a method call, a signal, or an error reply.
+ *
+ * A message has header fields such as the sender, destination, method
+ * or signal name, and so forth. DBusMessage has accessor functions for
+ * these, such as dbus_message_get_member().
+ *
+ * Convenience functions dbus_message_is_method_call(), dbus_message_is_signal(),
+ * and dbus_message_is_error() check several header fields at once and are
+ * slightly more efficient than checking the header fields with individual
+ * accessor functions.
+ *
+ * Finally, a message has arguments. The number and types of arguments
+ * are in the message's signature header field (accessed with
+ * dbus_message_get_signature()). Simple argument values are usually
+ * retrieved with dbus_message_get_args() but more complex values such
+ * as structs may require the use of #DBusMessageIter.
+ *
+ * The D-Bus specification goes into some more detail about header fields and
+ * message types.
+ *
+ * @{
+ */
+
+/**
+ * @typedef DBusMessage
+ *
+ * Opaque data type representing a message received from or to be
+ * sent to another application.
+ */
+
+/**
+ * Returns the serial of a message or 0 if none has been specified.
+ * The message's serial number is provided by the application sending
+ * the message and is used to identify replies to this message.
+ *
+ * All messages received on a connection will have a serial provided
+ * by the remote application.
+ *
+ * For messages you're sending, dbus_connection_send() will assign a
+ * serial and return it to you.
+ *
+ * @param message the message
+ * @returns the serial
+ */
+dbus_uint32_t
+dbus_message_get_serial (DBusMessage *message)
+{
+ _dbus_return_val_if_fail (message != NULL, 0);
+
+ return _dbus_header_get_serial (&message->header);
+}
+
+/**
+ * Sets the reply serial of a message (the serial of the message this
+ * is a reply to).
+ *
+ * @param message the message
+ * @param reply_serial the serial we're replying to
+ * @returns #FALSE if not enough memory
+ */
+dbus_bool_t
+dbus_message_set_reply_serial (DBusMessage *message,
+ dbus_uint32_t reply_serial)
+{
+ _dbus_return_val_if_fail (message != NULL, FALSE);
+ _dbus_return_val_if_fail (!message->locked, FALSE);
+ _dbus_return_val_if_fail (reply_serial != 0, FALSE); /* 0 is invalid */
+
+ return _dbus_header_set_field_basic (&message->header,
+ DBUS_HEADER_FIELD_REPLY_SERIAL,
+ DBUS_TYPE_UINT32,
+ &reply_serial);
+}
+
+/**
+ * Returns the serial that the message is a reply to or 0 if none.
+ *
+ * @param message the message
+ * @returns the reply serial
+ */
+dbus_uint32_t
+dbus_message_get_reply_serial (DBusMessage *message)
+{
+ dbus_uint32_t v_UINT32;
+
+ _dbus_return_val_if_fail (message != NULL, 0);
+
+ if (_dbus_header_get_field_basic (&message->header,
+ DBUS_HEADER_FIELD_REPLY_SERIAL,
+ DBUS_TYPE_UINT32,
+ &v_UINT32))
+ return v_UINT32;
+ else
+ return 0;
+}
+
+static void
+dbus_message_finalize (DBusMessage *message)
+{
+ _dbus_assert (message->refcount.value == 0);
+
+ /* This calls application callbacks! */
+ _dbus_data_slot_list_free (&message->slot_list);
+
+ _dbus_list_foreach (&message->size_counters,
+ free_size_counter, message);
+ _dbus_list_clear (&message->size_counters);
+
+ _dbus_header_free (&message->header);
+ _dbus_string_free (&message->body);
+
+ _dbus_assert (message->refcount.value == 0);
+
+ dbus_free (message);
+}
+
+static DBusMessage*
+dbus_message_new_empty_header (void)
+{
+ DBusMessage *message;
+ dbus_bool_t from_cache;
+
+ message = dbus_message_get_cached ();
+
+ if (message != NULL)
+ {
+ from_cache = TRUE;
+ }
+ else
+ {
+ from_cache = FALSE;
+ message = dbus_new (DBusMessage, 1);
+ if (message == NULL)
+ return NULL;
+#ifndef DBUS_DISABLE_CHECKS
+ message->generation = _dbus_current_generation;
+#endif
+ }
+
+ message->refcount.value = 1;
+ message->byte_order = DBUS_COMPILER_BYTE_ORDER;
+ message->locked = FALSE;
+#ifndef DBUS_DISABLE_CHECKS
+ message->in_cache = FALSE;
+#endif
+ message->size_counters = NULL;
+ message->size_counter_delta = 0;
+ message->changed_stamp = 0;
+
+ if (!from_cache)
+ _dbus_data_slot_list_init (&message->slot_list);
+
+ if (from_cache)
+ {
+ _dbus_header_reinit (&message->header, message->byte_order);
+ _dbus_string_set_length (&message->body, 0);
+ }
+ else
+ {
+ if (!_dbus_header_init (&message->header, message->byte_order))
+ {
+ dbus_free (message);
+ return NULL;
+ }
+
+ if (!_dbus_string_init_preallocated (&message->body, 32))
+ {
+ _dbus_header_free (&message->header);
+ dbus_free (message);
+ return NULL;
+ }
+ }
+
+ return message;
+}
+
+/**
+ * Constructs a new message of the given message type.
+ * Types include #DBUS_MESSAGE_TYPE_METHOD_CALL,
+ * #DBUS_MESSAGE_TYPE_SIGNAL, and so forth.
+ *
+ * Usually you want to use dbus_message_new_method_call(),
+ * dbus_message_new_method_return(), dbus_message_new_signal(),
+ * or dbus_message_new_error() instead.
+ *
+ * @param message_type type of message
+ * @returns new message or #NULL if no memory
+ */
+DBusMessage*
+dbus_message_new (int message_type)
+{
+ DBusMessage *message;
+
+ _dbus_return_val_if_fail (message_type != DBUS_MESSAGE_TYPE_INVALID, NULL);
+
+ message = dbus_message_new_empty_header ();
+ if (message == NULL)
+ return NULL;
+
+ if (!_dbus_header_create (&message->header,
+ message_type,
+ NULL, NULL, NULL, NULL, NULL))
+ {
+ dbus_message_unref (message);
+ return NULL;
+ }
+
+ return message;
+}
+
+/**
+ * Constructs a new message to invoke a method on a remote
+ * object. Returns #NULL if memory can't be allocated for the
+ * message. The destination may be #NULL in which case no destination
+ * is set; this is appropriate when using D-Bus in a peer-to-peer
+ * context (no message bus). The interface may be #NULL, which means
+ * that if multiple methods with the given name exist it is undefined
+ * which one will be invoked.
+ *
+ * The path and method names may not be #NULL.
+ *
+ * Destination, path, interface, and method name can't contain
+ * any invalid characters (see the D-Bus specification).
+ *
+ * @param destination name that the message should be sent to or #NULL
+ * @param path object path the message should be sent to
+ * @param interface interface to invoke method on, or #NULL
+ * @param method method to invoke
+ *
+ * @returns a new DBusMessage, free with dbus_message_unref()
+ */
+DBusMessage*
+dbus_message_new_method_call (const char *destination,
+ const char *path,
+ const char *interface,
+ const char *method)
+{
+ DBusMessage *message;
+
+ _dbus_return_val_if_fail (path != NULL, NULL);
+ _dbus_return_val_if_fail (method != NULL, NULL);
+ _dbus_return_val_if_fail (destination == NULL ||
+ _dbus_check_is_valid_bus_name (destination), NULL);
+ _dbus_return_val_if_fail (_dbus_check_is_valid_path (path), NULL);
+ _dbus_return_val_if_fail (interface == NULL ||
+ _dbus_check_is_valid_interface (interface), NULL);
+ _dbus_return_val_if_fail (_dbus_check_is_valid_member (method), NULL);
+
+ message = dbus_message_new_empty_header ();
+ if (message == NULL)
+ return NULL;
+
+ if (!_dbus_header_create (&message->header,
+ DBUS_MESSAGE_TYPE_METHOD_CALL,
+ destination, path, interface, method, NULL))
+ {
+ dbus_message_unref (message);
+ return NULL;
+ }
+
+ return message;
+}
+
+/**
+ * Constructs a message that is a reply to a method call. Returns
+ * #NULL if memory can't be allocated for the message.
+ *
+ * @param method_call the message being replied to
+ * @returns a new DBusMessage, free with dbus_message_unref()
+ */
+DBusMessage*
+dbus_message_new_method_return (DBusMessage *method_call)
+{
+ DBusMessage *message;
+ const char *sender;
+
+ _dbus_return_val_if_fail (method_call != NULL, NULL);
+
+ sender = dbus_message_get_sender (method_call);
+
+ /* sender is allowed to be null here in peer-to-peer case */
+
+ message = dbus_message_new_empty_header ();
+ if (message == NULL)
+ return NULL;
+
+ if (!_dbus_header_create (&message->header,
+ DBUS_MESSAGE_TYPE_METHOD_RETURN,
+ sender, NULL, NULL, NULL, NULL))
+ {
+ dbus_message_unref (message);
+ return NULL;
+ }
+
+ dbus_message_set_no_reply (message, TRUE);
+
+ if (!dbus_message_set_reply_serial (message,
+ dbus_message_get_serial (method_call)))
+ {
+ dbus_message_unref (message);
+ return NULL;
+ }
+
+ return message;
+}
+
+/**
+ * Constructs a new message representing a signal emission. Returns
+ * #NULL if memory can't be allocated for the message. A signal is
+ * identified by its originating object path, interface, and the name
+ * of the signal.
+ *
+ * Path, interface, and signal name must all be valid (the D-Bus
+ * specification defines the syntax of these fields).
+ *
+ * @param path the path to the object emitting the signal
+ * @param interface the interface the signal is emitted from
+ * @param name name of the signal
+ * @returns a new DBusMessage, free with dbus_message_unref()
+ */
+DBusMessage*
+dbus_message_new_signal (const char *path,
+ const char *interface,
+ const char *name)
+{
+ DBusMessage *message;
+
+ _dbus_return_val_if_fail (path != NULL, NULL);
+ _dbus_return_val_if_fail (interface != NULL, NULL);
+ _dbus_return_val_if_fail (name != NULL, NULL);
+ _dbus_return_val_if_fail (_dbus_check_is_valid_path (path), NULL);
+ _dbus_return_val_if_fail (_dbus_check_is_valid_interface (interface), NULL);
+ _dbus_return_val_if_fail (_dbus_check_is_valid_member (name), NULL);
+
+ message = dbus_message_new_empty_header ();
+ if (message == NULL)
+ return NULL;
+
+ if (!_dbus_header_create (&message->header,
+ DBUS_MESSAGE_TYPE_SIGNAL,
+ NULL, path, interface, name, NULL))
+ {
+ dbus_message_unref (message);
+ return NULL;
+ }
+
+ dbus_message_set_no_reply (message, TRUE);
+
+ return message;
+}
+
+/**
+ * Creates a new message that is an error reply to another message.
+ * Error replies are most common in response to method calls, but
+ * can be returned in reply to any message.
+ *
+ * The error name must be a valid error name according to the syntax
+ * given in the D-Bus specification. If you don't want to make
+ * up an error name just use #DBUS_ERROR_FAILED.
+ *
+ * @param reply_to the message we're replying to
+ * @param error_name the error name
+ * @param error_message the error message string (or #NULL for none, but please give a message)
+ * @returns a new error message object, free with dbus_message_unref()
+ */
+DBusMessage*
+dbus_message_new_error (DBusMessage *reply_to,
+ const char *error_name,
+ const char *error_message)
+{
+ DBusMessage *message;
+ const char *sender;
+ DBusMessageIter iter;
+
+ _dbus_return_val_if_fail (reply_to != NULL, NULL);
+ _dbus_return_val_if_fail (error_name != NULL, NULL);
+ _dbus_return_val_if_fail (_dbus_check_is_valid_error_name (error_name), NULL);
+
+ sender = dbus_message_get_sender (reply_to);
+
+ /* sender may be NULL for non-message-bus case or
+ * when the message bus is dealing with an unregistered
+ * connection.
+ */
+ message = dbus_message_new_empty_header ();
+ if (message == NULL)
+ return NULL;
+
+ if (!_dbus_header_create (&message->header,
+ DBUS_MESSAGE_TYPE_ERROR,
+ sender, NULL, NULL, NULL, error_name))
+ {
+ dbus_message_unref (message);
+ return NULL;
+ }
+
+ dbus_message_set_no_reply (message, TRUE);
+
+ if (!dbus_message_set_reply_serial (message,
+ dbus_message_get_serial (reply_to)))
+ {
+ dbus_message_unref (message);
+ return NULL;
+ }
+
+ if (error_message != NULL)
+ {
+ dbus_message_iter_init_append (message, &iter);
+ if (!dbus_message_iter_append_basic (&iter,
+ DBUS_TYPE_STRING,
+ &error_message))
+ {
+ dbus_message_unref (message);
+ return NULL;
+ }
+ }
+
+ return message;
+}
+
+/**
+ * Creates a new message that is an error reply to another message, allowing
+ * you to use printf formatting.
+ *
+ * See dbus_message_new_error() for details - this function is the same
+ * aside from the printf formatting.
+ *
+ * @todo add _DBUS_GNUC_PRINTF to this (requires moving _DBUS_GNUC_PRINTF to
+ * public header, see DBUS_DEPRECATED for an example)
+ *
+ * @param reply_to the original message
+ * @param error_name the error name
+ * @param error_format the error message format as with printf
+ * @param ... format string arguments
+ * @returns a new error message
+ */
+DBusMessage*
+dbus_message_new_error_printf (DBusMessage *reply_to,
+ const char *error_name,
+ const char *error_format,
+ ...)
+{
+ va_list args;
+ DBusString str;
+ DBusMessage *message;
+
+ _dbus_return_val_if_fail (reply_to != NULL, NULL);
+ _dbus_return_val_if_fail (error_name != NULL, NULL);
+ _dbus_return_val_if_fail (_dbus_check_is_valid_error_name (error_name), NULL);
+
+ if (!_dbus_string_init (&str))
+ return NULL;
+
+ va_start (args, error_format);
+
+ if (_dbus_string_append_printf_valist (&str, error_format, args))
+ message = dbus_message_new_error (reply_to, error_name,
+ _dbus_string_get_const_data (&str));
+ else
+ message = NULL;
+
+ _dbus_string_free (&str);
+
+ va_end (args);
+
+ return message;
+}
+
+
+/**
+ * Creates a new message that is an exact replica of the message
+ * specified, except that its refcount is set to 1, its message serial
+ * is reset to 0, and if the original message was "locked" (in the
+ * outgoing message queue and thus not modifiable) the new message
+ * will not be locked.
+ *
+ * @param message the message
+ * @returns the new message.or #NULL if not enough memory
+ */
+DBusMessage *
+dbus_message_copy (const DBusMessage *message)
+{
+ DBusMessage *retval;
+
+ _dbus_return_val_if_fail (message != NULL, NULL);
+
+ retval = dbus_new0 (DBusMessage, 1);
+ if (retval == NULL)
+ return NULL;
+
+ retval->refcount.value = 1;
+ retval->byte_order = message->byte_order;
+ retval->locked = FALSE;
+#ifndef DBUS_DISABLE_CHECKS
+ retval->generation = message->generation;
+#endif
+
+ if (!_dbus_header_copy (&message->header, &retval->header))
+ {
+ dbus_free (retval);
+ return NULL;
+ }
+
+ if (!_dbus_string_init_preallocated (&retval->body,
+ _dbus_string_get_length (&message->body)))
+ {
+ _dbus_header_free (&retval->header);
+ dbus_free (retval);
+ return NULL;
+ }
+
+ if (!_dbus_string_copy (&message->body, 0,
+ &retval->body, 0))
+ goto failed_copy;
+
+ return retval;
+
+ failed_copy:
+ _dbus_header_free (&retval->header);
+ _dbus_string_free (&retval->body);
+ dbus_free (retval);
+
+ return NULL;
+}
+
+
+/**
+ * Increments the reference count of a DBusMessage.
+ *
+ * @param message the message
+ * @returns the message
+ * @see dbus_message_unref
+ */
+DBusMessage *
+dbus_message_ref (DBusMessage *message)
+{
+ dbus_int32_t old_refcount;
+
+ _dbus_return_val_if_fail (message != NULL, NULL);
+ _dbus_return_val_if_fail (message->generation == _dbus_current_generation, NULL);
+ _dbus_return_val_if_fail (!message->in_cache, NULL);
+
+ old_refcount = _dbus_atomic_inc (&message->refcount);
+ _dbus_assert (old_refcount >= 1);
+
+ return message;
+}
+
+/**
+ * Decrements the reference count of a DBusMessage, freeing the
+ * message if the count reaches 0.
+ *
+ * @param message the message
+ * @see dbus_message_ref
+ */
+void
+dbus_message_unref (DBusMessage *message)
+{
+ dbus_int32_t old_refcount;
+
+ _dbus_return_if_fail (message != NULL);
+ _dbus_return_if_fail (message->generation == _dbus_current_generation);
+ _dbus_return_if_fail (!message->in_cache);
+
+ old_refcount = _dbus_atomic_dec (&message->refcount);
+
+ _dbus_assert (old_refcount >= 0);
+
+ if (old_refcount == 1)
+ {
+ /* Calls application callbacks! */
+ dbus_message_cache_or_finalize (message);
+ }
+}
+
+/**
+ * Gets the type of a message. Types include
+ * #DBUS_MESSAGE_TYPE_METHOD_CALL, #DBUS_MESSAGE_TYPE_METHOD_RETURN,
+ * #DBUS_MESSAGE_TYPE_ERROR, #DBUS_MESSAGE_TYPE_SIGNAL, but other
+ * types are allowed and all code must silently ignore messages of
+ * unknown type. #DBUS_MESSAGE_TYPE_INVALID will never be returned.
+ *
+ * @param message the message
+ * @returns the type of the message
+ */
+int
+dbus_message_get_type (DBusMessage *message)
+{
+ _dbus_return_val_if_fail (message != NULL, DBUS_MESSAGE_TYPE_INVALID);
+
+ return _dbus_header_get_message_type (&message->header);
+}
+
+/**
+ * Appends fields to a message given a variable argument list. The
+ * variable argument list should contain the type of each argument
+ * followed by the value to append. Appendable types are basic types,
+ * and arrays of fixed-length basic types. To append variable-length
+ * basic types, or any more complex value, you have to use an iterator
+ * rather than this function.
+ *
+ * To append a basic type, specify its type code followed by the
+ * address of the value. For example:
+ *
+ * @code
+ *
+ * dbus_int32_t v_INT32 = 42;
+ * const char *v_STRING = "Hello World";
+ * dbus_message_append_args (message,
+ * DBUS_TYPE_INT32, &v_INT32,
+ * DBUS_TYPE_STRING, &v_STRING,
+ * DBUS_TYPE_INVALID);
+ * @endcode
+ *
+ * To append an array of fixed-length basic types, pass in the
+ * DBUS_TYPE_ARRAY typecode, the element typecode, the address of
+ * the array pointer, and a 32-bit integer giving the number of
+ * elements in the array. So for example:
+ * @code
+ * const dbus_int32_t array[] = { 1, 2, 3 };
+ * const dbus_int32_t *v_ARRAY = array;
+ * dbus_message_append_args (message,
+ * DBUS_TYPE_ARRAY, DBUS_TYPE_INT32, &v_ARRAY, 3,
+ * DBUS_TYPE_INVALID);
+ * @endcode
+ *
+ * @warning in C, given "int array[]", "&array == array" (the
+ * comp.lang.c FAQ says otherwise, but gcc and the FAQ don't agree).
+ * So if you're using an array instead of a pointer you have to create
+ * a pointer variable, assign the array to it, then take the address
+ * of the pointer variable. For strings it works to write
+ * const char *array = "Hello" and then use &array though.
+ *
+ * The last argument to this function must be #DBUS_TYPE_INVALID,
+ * marking the end of the argument list. If you don't do this
+ * then libdbus won't know to stop and will read invalid memory.
+ *
+ * String/signature/path arrays should be passed in as "const char***
+ * address_of_array" and "int n_elements"
+ *
+ * @todo support DBUS_TYPE_STRUCT and DBUS_TYPE_VARIANT and complex arrays
+ *
+ * @todo If this fails due to lack of memory, the message is hosed and
+ * you have to start over building the whole message.
+ *
+ * @param message the message
+ * @param first_arg_type type of the first argument
+ * @param ... value of first argument, list of additional type-value pairs
+ * @returns #TRUE on success
+ */
+dbus_bool_t
+dbus_message_append_args (DBusMessage *message,
+ int first_arg_type,
+ ...)
+{
+ dbus_bool_t retval;
+ va_list var_args;
+
+ _dbus_return_val_if_fail (message != NULL, FALSE);
+
+ va_start (var_args, first_arg_type);
+ retval = dbus_message_append_args_valist (message,
+ first_arg_type,
+ var_args);
+ va_end (var_args);
+
+ return retval;
+}
+
+/**
+ * Like dbus_message_append_args() but takes a va_list for use by language bindings.
+ *
+ * @todo for now, if this function fails due to OOM it will leave
+ * the message half-written and you have to discard the message
+ * and start over.
+ *
+ * @see dbus_message_append_args.
+ * @param message the message
+ * @param first_arg_type type of first argument
+ * @param var_args value of first argument, then list of type/value pairs
+ * @returns #TRUE on success
+ */
+dbus_bool_t
+dbus_message_append_args_valist (DBusMessage *message,
+ int first_arg_type,
+ va_list var_args)
+{
+ int type;
+ DBusMessageIter iter;
+
+ _dbus_return_val_if_fail (message != NULL, FALSE);
+
+ type = first_arg_type;
+
+ dbus_message_iter_init_append (message, &iter);
+
+ while (type != DBUS_TYPE_INVALID)
+ {
+ if (dbus_type_is_basic (type))
+ {
+ const DBusBasicValue *value;
+ value = va_arg (var_args, const DBusBasicValue*);
+
+ if (!dbus_message_iter_append_basic (&iter,
+ type,
+ value))
+ goto failed;
+ }
+ else if (type == DBUS_TYPE_ARRAY)
+ {
+ int element_type;
+ DBusMessageIter array;
+ char buf[2];
+
+ element_type = va_arg (var_args, int);
+
+ buf[0] = element_type;
+ buf[1] = '\0';
+ if (!dbus_message_iter_open_container (&iter,
+ DBUS_TYPE_ARRAY,
+ buf,
+ &array))
+ goto failed;
+
+ if (dbus_type_is_fixed (element_type))
+ {
+ const DBusBasicValue **value;
+ int n_elements;
+
+ value = va_arg (var_args, const DBusBasicValue**);
+ n_elements = va_arg (var_args, int);
+
+ if (!dbus_message_iter_append_fixed_array (&array,
+ element_type,
+ value,
+ n_elements))
+ goto failed;
+ }
+ else if (element_type == DBUS_TYPE_STRING ||
+ element_type == DBUS_TYPE_SIGNATURE ||
+ element_type == DBUS_TYPE_OBJECT_PATH)
+ {
+ const char ***value_p;
+ const char **value;
+ int n_elements;
+ int i;
+
+ value_p = va_arg (var_args, const char***);
+ n_elements = va_arg (var_args, int);
+
+ value = *value_p;
+
+ i = 0;
+ while (i < n_elements)
+ {
+ if (!dbus_message_iter_append_basic (&array,
+ element_type,
+ &value[i]))
+ goto failed;
+ ++i;
+ }
+ }
+ else
+ {
+ _dbus_warn ("arrays of %s can't be appended with %s for now\n",
+ _dbus_type_to_string (element_type),
+ _DBUS_FUNCTION_NAME);
+ goto failed;
+ }
+
+ if (!dbus_message_iter_close_container (&iter, &array))
+ goto failed;
+ }
+#ifndef DBUS_DISABLE_CHECKS
+ else
+ {
+ _dbus_warn ("type %s isn't supported yet in %s\n",
+ _dbus_type_to_string (type), _DBUS_FUNCTION_NAME);
+ goto failed;
+ }
+#endif
+
+ type = va_arg (var_args, int);
+ }
+
+ return TRUE;
+
+ failed:
+ return FALSE;
+}
+
+/**
+ * Gets arguments from a message given a variable argument list. The
+ * supported types include those supported by
+ * dbus_message_append_args(); that is, basic types and arrays of
+ * fixed-length basic types. The arguments are the same as they would
+ * be for dbus_message_iter_get_basic() or
+ * dbus_message_iter_get_fixed_array().
+ *
+ * In addition to those types, arrays of string, object path, and
+ * signature are supported; but these are returned as allocated memory
+ * and must be freed with dbus_free_string_array(), while the other
+ * types are returned as const references. To get a string array
+ * pass in "char ***array_location" and "int *n_elements"
+ *
+ * The variable argument list should contain the type of the argument
+ * followed by a pointer to where the value should be stored. The list
+ * is terminated with #DBUS_TYPE_INVALID.
+ *
+ * Except for string arrays, the returned values are constant; do not
+ * free them. They point into the #DBusMessage.
+ *
+ * If the requested arguments are not present, or do not have the
+ * requested types, then an error will be set.
+ *
+ * If more arguments than requested are present, the requested
+ * arguments are returned and the extra arguments are ignored.
+ *
+ * @todo support DBUS_TYPE_STRUCT and DBUS_TYPE_VARIANT and complex arrays
+ *
+ * @param message the message
+ * @param error error to be filled in on failure
+ * @param first_arg_type the first argument type
+ * @param ... location for first argument value, then list of type-location pairs
+ * @returns #FALSE if the error was set
+ */
+dbus_bool_t
+dbus_message_get_args (DBusMessage *message,
+ DBusError *error,
+ int first_arg_type,
+ ...)
+{
+ dbus_bool_t retval;
+ va_list var_args;
+
+ _dbus_return_val_if_fail (message != NULL, FALSE);
+ _dbus_return_val_if_error_is_set (error, FALSE);
+
+ va_start (var_args, first_arg_type);
+ retval = dbus_message_get_args_valist (message, error, first_arg_type, var_args);
+ va_end (var_args);
+
+ return retval;
+}
+
+/**
+ * Like dbus_message_get_args but takes a va_list for use by language bindings.
+ *
+ * @see dbus_message_get_args
+ * @param message the message
+ * @param error error to be filled in
+ * @param first_arg_type type of the first argument
+ * @param var_args return location for first argument, followed by list of type/location pairs
+ * @returns #FALSE if error was set
+ */
+dbus_bool_t
+dbus_message_get_args_valist (DBusMessage *message,
+ DBusError *error,
+ int first_arg_type,
+ va_list var_args)
+{
+ DBusMessageIter iter;
+
+ _dbus_return_val_if_fail (message != NULL, FALSE);
+ _dbus_return_val_if_error_is_set (error, FALSE);
+
+ dbus_message_iter_init (message, &iter);
+ return _dbus_message_iter_get_args_valist (&iter, error, first_arg_type, var_args);
+}
+
+static void
+_dbus_message_iter_init_common (DBusMessage *message,
+ DBusMessageRealIter *real,
+ int iter_type)
+{
+ _dbus_assert (sizeof (DBusMessageRealIter) <= sizeof (DBusMessageIter));
+
+ /* Since the iterator will read or write who-knows-what from the
+ * message, we need to get in the right byte order
+ */
+ ensure_byte_order (message);
+
+ real->message = message;
+ real->changed_stamp = message->changed_stamp;
+ real->iter_type = iter_type;
+ real->sig_refcount = 0;
+}
+
+/**
+ * Initializes a #DBusMessageIter for reading the arguments of the
+ * message passed in.
+ *
+ * When possible, dbus_message_get_args() is much more convenient.
+ * Some types of argument can only be read with #DBusMessageIter
+ * however.
+ *
+ * The easiest way to iterate is like this:
+ * @code
+ * dbus_message_iter_init (message, &iter);
+ * while ((current_type = dbus_message_iter_get_arg_type (&iter)) != DBUS_TYPE_INVALID)
+ * dbus_message_iter_next (&iter);
+ * @endcode
+ *
+ * #DBusMessageIter contains no allocated memory; it need not be
+ * freed, and can be copied by assignment or memcpy().
+ *
+ * @param message the message
+ * @param iter pointer to an iterator to initialize
+ * @returns #FALSE if the message has no arguments
+ */
+dbus_bool_t
+dbus_message_iter_init (DBusMessage *message,
+ DBusMessageIter *iter)
+{
+ DBusMessageRealIter *real = (DBusMessageRealIter *)iter;
+ const DBusString *type_str;
+ int type_pos;
+
+ _dbus_return_val_if_fail (message != NULL, FALSE);
+ _dbus_return_val_if_fail (iter != NULL, FALSE);
+
+ get_const_signature (&message->header, &type_str, &type_pos);
+
+ _dbus_message_iter_init_common (message, real,
+ DBUS_MESSAGE_ITER_TYPE_READER);
+
+ _dbus_type_reader_init (&real->u.reader,
+ message->byte_order,
+ type_str, type_pos,
+ &message->body,
+ 0);
+
+ return _dbus_type_reader_get_current_type (&real->u.reader) != DBUS_TYPE_INVALID;
+}
+
+/**
+ * Checks if an iterator has any more fields.
+ *
+ * @param iter the message iter
+ * @returns #TRUE if there are more fields following
+ */
+dbus_bool_t
+dbus_message_iter_has_next (DBusMessageIter *iter)
+{
+ DBusMessageRealIter *real = (DBusMessageRealIter *)iter;
+
+ _dbus_return_val_if_fail (_dbus_message_iter_check (real), FALSE);
+ _dbus_return_val_if_fail (real->iter_type == DBUS_MESSAGE_ITER_TYPE_READER, FALSE);
+
+ return _dbus_type_reader_has_next (&real->u.reader);
+}
+
+/**
+ * Moves the iterator to the next field, if any. If there's no next
+ * field, returns #FALSE. If the iterator moves forward, returns
+ * #TRUE.
+ *
+ * @param iter the message iter
+ * @returns #TRUE if the iterator was moved to the next field
+ */
+dbus_bool_t
+dbus_message_iter_next (DBusMessageIter *iter)
+{
+ DBusMessageRealIter *real = (DBusMessageRealIter *)iter;
+
+ _dbus_return_val_if_fail (_dbus_message_iter_check (real), FALSE);
+ _dbus_return_val_if_fail (real->iter_type == DBUS_MESSAGE_ITER_TYPE_READER, FALSE);
+
+ return _dbus_type_reader_next (&real->u.reader);
+}
+
+/**
+ * Returns the argument type of the argument that the message iterator
+ * points to. If the iterator is at the end of the message, returns
+ * #DBUS_TYPE_INVALID. You can thus write a loop as follows:
+ *
+ * @code
+ * dbus_message_iter_init (&iter);
+ * while ((current_type = dbus_message_iter_get_arg_type (&iter)) != DBUS_TYPE_INVALID)
+ * dbus_message_iter_next (&iter);
+ * @endcode
+ *
+ * @param iter the message iter
+ * @returns the argument type
+ */
+int
+dbus_message_iter_get_arg_type (DBusMessageIter *iter)
+{
+ DBusMessageRealIter *real = (DBusMessageRealIter *)iter;
+
+ _dbus_return_val_if_fail (_dbus_message_iter_check (real), DBUS_TYPE_INVALID);
+ _dbus_return_val_if_fail (real->iter_type == DBUS_MESSAGE_ITER_TYPE_READER, FALSE);
+
+ return _dbus_type_reader_get_current_type (&real->u.reader);
+}
+
+/**
+ * Returns the element type of the array that the message iterator
+ * points to. Note that you need to check that the iterator points to
+ * an array prior to using this function.
+ *
+ * @param iter the message iter
+ * @returns the array element type
+ */
+int
+dbus_message_iter_get_element_type (DBusMessageIter *iter)
+{
+ DBusMessageRealIter *real = (DBusMessageRealIter *)iter;
+
+ _dbus_return_val_if_fail (_dbus_message_iter_check (real), DBUS_TYPE_INVALID);
+ _dbus_return_val_if_fail (real->iter_type == DBUS_MESSAGE_ITER_TYPE_READER, DBUS_TYPE_INVALID);
+ _dbus_return_val_if_fail (dbus_message_iter_get_arg_type (iter) == DBUS_TYPE_ARRAY, DBUS_TYPE_INVALID);
+
+ return _dbus_type_reader_get_element_type (&real->u.reader);
+}
+
+/**
+ * Recurses into a container value when reading values from a message,
+ * initializing a sub-iterator to use for traversing the child values
+ * of the container.
+ *
+ * Note that this recurses into a value, not a type, so you can only
+ * recurse if the value exists. The main implication of this is that
+ * if you have for example an empty array of array of int32, you can
+ * recurse into the outermost array, but it will have no values, so
+ * you won't be able to recurse further. There's no array of int32 to
+ * recurse into.
+ *
+ * If a container is an array of fixed-length types, it is much more
+ * efficient to use dbus_message_iter_get_fixed_array() to get the
+ * whole array in one shot, rather than individually walking over the
+ * array elements.
+ *
+ * Be sure you have somehow checked that
+ * dbus_message_iter_get_arg_type() matches the type you are expecting
+ * to recurse into. Results of this function are undefined if there is
+ * no container to recurse into at the current iterator position.
+ *
+ * @param iter the message iterator
+ * @param sub the sub-iterator to initialize
+ */
+void
+dbus_message_iter_recurse (DBusMessageIter *iter,
+ DBusMessageIter *sub)
+{
+ DBusMessageRealIter *real = (DBusMessageRealIter *)iter;
+ DBusMessageRealIter *real_sub = (DBusMessageRealIter *)sub;
+
+ _dbus_return_if_fail (_dbus_message_iter_check (real));
+ _dbus_return_if_fail (sub != NULL);
+
+ *real_sub = *real;
+ _dbus_type_reader_recurse (&real->u.reader, &real_sub->u.reader);
+}
+
+/**
+ * Returns the current signature of a message iterator. This
+ * is useful primarily for dealing with variants; one can
+ * recurse into a variant and determine the signature of
+ * the variant's value.
+ *
+ * The returned string must be freed with dbus_free().
+ *
+ * @param iter the message iterator
+ * @returns the contained signature, or NULL if out of memory
+ */
+char *
+dbus_message_iter_get_signature (DBusMessageIter *iter)
+{
+ const DBusString *sig;
+ DBusString retstr;
+ char *ret;
+ int start, len;
+ DBusMessageRealIter *real = (DBusMessageRealIter *)iter;
+
+ _dbus_return_val_if_fail (_dbus_message_iter_check (real), NULL);
+
+ if (!_dbus_string_init (&retstr))
+ return NULL;
+
+ _dbus_type_reader_get_signature (&real->u.reader, &sig,
+ &start, &len);
+ if (!_dbus_string_append_len (&retstr,
+ _dbus_string_get_const_data (sig) + start,
+ len))
+ return NULL;
+ if (!_dbus_string_steal_data (&retstr, &ret))
+ return NULL;
+ _dbus_string_free (&retstr);
+ return ret;
+}
+
+/**
+ * Reads a basic-typed value from the message iterator.
+ * Basic types are the non-containers such as integer and string.
+ *
+ * The value argument should be the address of a location to store
+ * the returned value. So for int32 it should be a "dbus_int32_t*"
+ * and for string a "const char**". The returned value is
+ * by reference and should not be freed.
+ *
+ * Be sure you have somehow checked that
+ * dbus_message_iter_get_arg_type() matches the type you are
+ * expecting, or you'll crash when you try to use an integer as a
+ * string or something.
+ *
+ * To read any container type (array, struct, dict) you will need
+ * to recurse into the container with dbus_message_iter_recurse().
+ * If the container is an array of fixed-length values, you can
+ * get all the array elements at once with
+ * dbus_message_iter_get_fixed_array(). Otherwise, you have to
+ * iterate over the container's contents one value at a time.
+ *
+ * All basic-typed values are guaranteed to fit in 8 bytes. So you can
+ * write code like this:
+ *
+ * @code
+ * dbus_uint64_t value;
+ * int type;
+ * dbus_message_iter_get_basic (&read_iter, &value);
+ * type = dbus_message_iter_get_arg_type (&read_iter);
+ * dbus_message_iter_append_basic (&write_iter, type, &value);
+ * @endcode
+ *
+ * On some really obscure platforms dbus_uint64_t might not exist, if
+ * you need to worry about this you will know. dbus_uint64_t is just
+ * one example of a type that's large enough to hold any possible
+ * value, you could use a struct or char[8] instead if you like.
+ *
+ * @param iter the iterator
+ * @param value location to store the value
+ */
+void
+dbus_message_iter_get_basic (DBusMessageIter *iter,
+ void *value)
+{
+ DBusMessageRealIter *real = (DBusMessageRealIter *)iter;
+
+ _dbus_return_if_fail (_dbus_message_iter_check (real));
+ _dbus_return_if_fail (value != NULL);
+
+ _dbus_type_reader_read_basic (&real->u.reader,
+ value);
+}
+
+/**
+ * Returns the number of bytes in the array as marshaled in the wire
+ * protocol. The iterator must currently be inside an array-typed
+ * value.
+ *
+ * This function is deprecated on the grounds that it is stupid. Why
+ * would you want to know how many bytes are in the array as marshaled
+ * in the wire protocol? For now, use the n_elements returned from
+ * dbus_message_iter_get_fixed_array() instead, or iterate over the
+ * array values and count them.
+ *
+ * @todo introduce a variant of this get_n_elements that returns
+ * the number of elements, though with a non-fixed array it will not
+ * be very efficient, so maybe it's not good.
+ *
+ * @param iter the iterator
+ * @returns the number of bytes in the array
+ */
+int
+dbus_message_iter_get_array_len (DBusMessageIter *iter)
+{
+ DBusMessageRealIter *real = (DBusMessageRealIter *)iter;
+
+ _dbus_return_val_if_fail (_dbus_message_iter_check (real), 0);
+
+ return _dbus_type_reader_get_array_length (&real->u.reader);
+}
+
+/**
+ * Reads a block of fixed-length values from the message iterator.
+ * Fixed-length values are those basic types that are not string-like,
+ * such as integers, bool, double. The returned block will be from the
+ * current position in the array until the end of the array.
+ *
+ * The message iter should be "in" the array (that is, you recurse into the
+ * array, and then you call dbus_message_iter_get_fixed_array() on the
+ * "sub-iterator" created by dbus_message_iter_recurse()).
+ *
+ * The value argument should be the address of a location to store the
+ * returned array. So for int32 it should be a "const dbus_int32_t**"
+ * The returned value is by reference and should not be freed.
+ *
+ * This function should only be used if dbus_type_is_fixed() returns
+ * #TRUE for the element type.
+ *
+ * If an array's elements are not fixed in size, you have to recurse
+ * into the array with dbus_message_iter_recurse() and read the
+ * elements one by one.
+ *
+ * Because the array is not copied, this function runs in constant
+ * time and is fast; it's much preferred over walking the entire array
+ * with an iterator. (However, you can always use
+ * dbus_message_iter_recurse(), even for fixed-length types;
+ * dbus_message_iter_get_fixed_array() is just an optimization.)
+ *
+ * @param iter the iterator
+ * @param value location to store the block
+ * @param n_elements number of elements in the block
+ */
+void
+dbus_message_iter_get_fixed_array (DBusMessageIter *iter,
+ void *value,
+ int *n_elements)
+{
+ DBusMessageRealIter *real = (DBusMessageRealIter *)iter;
+ int subtype = _dbus_type_reader_get_current_type(&real->u.reader);
+
+ _dbus_return_if_fail (_dbus_message_iter_check (real));
+ _dbus_return_if_fail (value != NULL);
+ _dbus_return_if_fail ((subtype == DBUS_TYPE_INVALID) ||
+ dbus_type_is_fixed (subtype));
+
+ _dbus_type_reader_read_fixed_multi (&real->u.reader,
+ value, n_elements);
+}
+
+/**
+ * Initializes a #DBusMessageIter for appending arguments to the end
+ * of a message.
+ *
+ * @todo If appending any of the arguments fails due to lack of
+ * memory, the message is hosed and you have to start over building
+ * the whole message.
+ *
+ * @param message the message
+ * @param iter pointer to an iterator to initialize
+ */
+void
+dbus_message_iter_init_append (DBusMessage *message,
+ DBusMessageIter *iter)
+{
+ DBusMessageRealIter *real = (DBusMessageRealIter *)iter;
+
+ _dbus_return_if_fail (message != NULL);
+ _dbus_return_if_fail (iter != NULL);
+
+ _dbus_message_iter_init_common (message, real,
+ DBUS_MESSAGE_ITER_TYPE_WRITER);
+
+ /* We create the signature string and point iterators at it "on demand"
+ * when a value is actually appended. That means that init() never fails
+ * due to OOM.
+ */
+ _dbus_type_writer_init_types_delayed (&real->u.writer,
+ message->byte_order,
+ &message->body,
+ _dbus_string_get_length (&message->body));
+}
+
+/**
+ * Creates a temporary signature string containing the current
+ * signature, stores it in the iterator, and points the iterator to
+ * the end of it. Used any time we write to the message.
+ *
+ * @param real an iterator without a type_str
+ * @returns #FALSE if no memory
+ */
+static dbus_bool_t
+_dbus_message_iter_open_signature (DBusMessageRealIter *real)
+{
+ DBusString *str;
+ const DBusString *current_sig;
+ int current_sig_pos;
+
+ _dbus_assert (real->iter_type == DBUS_MESSAGE_ITER_TYPE_WRITER);
+
+ if (real->u.writer.type_str != NULL)
+ {
+ _dbus_assert (real->sig_refcount > 0);
+ real->sig_refcount += 1;
+ return TRUE;
+ }
+
+ str = dbus_new (DBusString, 1);
+ if (str == NULL)
+ return FALSE;
+
+ if (!_dbus_header_get_field_raw (&real->message->header,
+ DBUS_HEADER_FIELD_SIGNATURE,
+ ¤t_sig, ¤t_sig_pos))
+ current_sig = NULL;
+
+ if (current_sig)
+ {
+ int current_len;
+
+ current_len = _dbus_string_get_byte (current_sig, current_sig_pos);
+ current_sig_pos += 1; /* move on to sig data */
+
+ if (!_dbus_string_init_preallocated (str, current_len + 4))
+ {
+ dbus_free (str);
+ return FALSE;
+ }
+
+ if (!_dbus_string_copy_len (current_sig, current_sig_pos, current_len,
+ str, 0))
+ {
+ _dbus_string_free (str);
+ dbus_free (str);
+ return FALSE;
+ }
+ }
+ else
+ {
+ if (!_dbus_string_init_preallocated (str, 4))
+ {
+ dbus_free (str);
+ return FALSE;
+ }
+ }
+
+ real->sig_refcount = 1;
+
+ _dbus_type_writer_add_types (&real->u.writer,
+ str, _dbus_string_get_length (str));
+ return TRUE;
+}
+
+/**
+ * Sets the new signature as the message signature, frees the
+ * signature string, and marks the iterator as not having a type_str
+ * anymore. Frees the signature even if it fails, so you can't
+ * really recover from failure. Kinda busted.
+ *
+ * @param real an iterator without a type_str
+ * @returns #FALSE if no memory
+ */
+static dbus_bool_t
+_dbus_message_iter_close_signature (DBusMessageRealIter *real)
+{
+ DBusString *str;
+ const char *v_STRING;
+ dbus_bool_t retval;
+
+ _dbus_assert (real->iter_type == DBUS_MESSAGE_ITER_TYPE_WRITER);
+ _dbus_assert (real->u.writer.type_str != NULL);
+ _dbus_assert (real->sig_refcount > 0);
+
+ real->sig_refcount -= 1;
+
+ if (real->sig_refcount > 0)
+ return TRUE;
+ _dbus_assert (real->sig_refcount == 0);
+
+ retval = TRUE;
+
+ str = real->u.writer.type_str;
+
+ v_STRING = _dbus_string_get_const_data (str);
+ if (!_dbus_header_set_field_basic (&real->message->header,
+ DBUS_HEADER_FIELD_SIGNATURE,
+ DBUS_TYPE_SIGNATURE,
+ &v_STRING))
+ retval = FALSE;
+
+ _dbus_type_writer_remove_types (&real->u.writer);
+ _dbus_string_free (str);
+ dbus_free (str);
+
+ return retval;
+}
+
+#ifndef DBUS_DISABLE_CHECKS
+static dbus_bool_t
+_dbus_message_iter_append_check (DBusMessageRealIter *iter)
+{
+ if (!_dbus_message_iter_check (iter))
+ return FALSE;
+
+ if (iter->message->locked)
+ {
+ _dbus_warn_check_failed ("dbus append iterator can't be used: message is locked (has already been sent)\n");
+ return FALSE;
+ }
+
+ return TRUE;
+}
+#endif /* DBUS_DISABLE_CHECKS */
+
+/**
+ * Appends a basic-typed value to the message. The basic types are the
+ * non-container types such as integer and string.
+ *
+ * The "value" argument should be the address of a basic-typed value.
+ * So for string, const char**. For integer, dbus_int32_t*.
+ *
+ * @todo If this fails due to lack of memory, the message is hosed and
+ * you have to start over building the whole message.
+ *
+ * @param iter the append iterator
+ * @param type the type of the value
+ * @param value the address of the value
+ * @returns #FALSE if not enough memory
+ */
+dbus_bool_t
+dbus_message_iter_append_basic (DBusMessageIter *iter,
+ int type,
+ const void *value)
+{
+ DBusMessageRealIter *real = (DBusMessageRealIter *)iter;
+ dbus_bool_t ret;
+
+ _dbus_return_val_if_fail (_dbus_message_iter_append_check (real), FALSE);
+ _dbus_return_val_if_fail (real->iter_type == DBUS_MESSAGE_ITER_TYPE_WRITER, FALSE);
+ _dbus_return_val_if_fail (dbus_type_is_basic (type), FALSE);
+ _dbus_return_val_if_fail (value != NULL, FALSE);
+
+ if (!_dbus_message_iter_open_signature (real))
+ return FALSE;
+
+ ret = _dbus_type_writer_write_basic (&real->u.writer, type, value);
+
+ if (!_dbus_message_iter_close_signature (real))
+ ret = FALSE;
+
+ return ret;
+}
+
+/**
+ * Appends a block of fixed-length values to an array. The
+ * fixed-length types are all basic types that are not string-like. So
+ * int32, double, bool, etc. You must call
+ * dbus_message_iter_open_container() to open an array of values
+ * before calling this function. You may call this function multiple
+ * times (and intermixed with calls to
+ * dbus_message_iter_append_basic()) for the same array.
+ *
+ * The "value" argument should be the address of the array. So for
+ * integer, "dbus_int32_t**" is expected for example.
+ *
+ * @warning in C, given "int array[]", "&array == array" (the
+ * comp.lang.c FAQ says otherwise, but gcc and the FAQ don't agree).
+ * So if you're using an array instead of a pointer you have to create
+ * a pointer variable, assign the array to it, then take the address
+ * of the pointer variable.
+ * @code
+ * const dbus_int32_t array[] = { 1, 2, 3 };
+ * const dbus_int32_t *v_ARRAY = array;
+ * if (!dbus_message_iter_append_fixed_array (&iter, DBUS_TYPE_INT32, &v_ARRAY, 3))
+ * fprintf (stderr, "No memory!\n");
+ * @endcode
+ * For strings it works to write const char *array = "Hello" and then
+ * use &array though.
+ *
+ * @todo If this fails due to lack of memory, the message is hosed and
+ * you have to start over building the whole message.
+ *
+ * @param iter the append iterator
+ * @param element_type the type of the array elements
+ * @param value the address of the array
+ * @param n_elements the number of elements to append
+ * @returns #FALSE if not enough memory
+ */
+dbus_bool_t
+dbus_message_iter_append_fixed_array (DBusMessageIter *iter,
+ int element_type,
+ const void *value,
+ int n_elements)
+{
+ DBusMessageRealIter *real = (DBusMessageRealIter *)iter;
+ dbus_bool_t ret;
+
+ _dbus_return_val_if_fail (_dbus_message_iter_append_check (real), FALSE);
+ _dbus_return_val_if_fail (real->iter_type == DBUS_MESSAGE_ITER_TYPE_WRITER, FALSE);
+ _dbus_return_val_if_fail (dbus_type_is_fixed (element_type), FALSE);
+ _dbus_return_val_if_fail (real->u.writer.container_type == DBUS_TYPE_ARRAY, FALSE);
+ _dbus_return_val_if_fail (value != NULL, FALSE);
+ _dbus_return_val_if_fail (n_elements >= 0, FALSE);
+ _dbus_return_val_if_fail (n_elements <=
+ DBUS_MAXIMUM_ARRAY_LENGTH / _dbus_type_get_alignment (element_type),
+ FALSE);
+
+ ret = _dbus_type_writer_write_fixed_multi (&real->u.writer, element_type, value, n_elements);
+
+ return ret;
+}
+
+/**
+ * Appends a container-typed value to the message; you are required to
+ * append the contents of the container using the returned
+ * sub-iterator, and then call
+ * dbus_message_iter_close_container(). Container types are for
+ * example struct, variant, and array. For variants, the
+ * contained_signature should be the type of the single value inside
+ * the variant. For structs and dict entries, contained_signature
+ * should be #NULL; it will be set to whatever types you write into
+ * the struct. For arrays, contained_signature should be the type of
+ * the array elements.
+ *
+ * @todo If this fails due to lack of memory, the message is hosed and
+ * you have to start over building the whole message.
+ *
+ * @param iter the append iterator
+ * @param type the type of the value
+ * @param contained_signature the type of container contents
+ * @param sub sub-iterator to initialize
+ * @returns #FALSE if not enough memory
+ */
+dbus_bool_t
+dbus_message_iter_open_container (DBusMessageIter *iter,
+ int type,
+ const char *contained_signature,
+ DBusMessageIter *sub)
+{
+ DBusMessageRealIter *real = (DBusMessageRealIter *)iter;
+ DBusMessageRealIter *real_sub = (DBusMessageRealIter *)sub;
+ DBusString contained_str;
+
+ _dbus_return_val_if_fail (_dbus_message_iter_append_check (real), FALSE);
+ _dbus_return_val_if_fail (real->iter_type == DBUS_MESSAGE_ITER_TYPE_WRITER, FALSE);
+ _dbus_return_val_if_fail (dbus_type_is_container (type), FALSE);
+ _dbus_return_val_if_fail (sub != NULL, FALSE);
+ _dbus_return_val_if_fail ((type == DBUS_TYPE_STRUCT &&
+ contained_signature == NULL) ||
+ (type == DBUS_TYPE_DICT_ENTRY &&
+ contained_signature == NULL) ||
+ (type == DBUS_TYPE_VARIANT &&
+ contained_signature != NULL) ||
+ (type == DBUS_TYPE_ARRAY &&
+ contained_signature != NULL), FALSE);
+
+ /* this would fail if the contained_signature is a dict entry, since
+ * dict entries are invalid signatures standalone (they must be in
+ * an array)
+ */
+ _dbus_return_val_if_fail ((type == DBUS_TYPE_ARRAY && contained_signature && *contained_signature == DBUS_DICT_ENTRY_BEGIN_CHAR) ||
+ (contained_signature == NULL ||
+ _dbus_check_is_valid_signature (contained_signature)),
+ FALSE);
+
+ if (!_dbus_message_iter_open_signature (real))
+ return FALSE;
+
+ *real_sub = *real;
+
+ if (contained_signature != NULL)
+ {
+ _dbus_string_init_const (&contained_str, contained_signature);
+
+ return _dbus_type_writer_recurse (&real->u.writer,
+ type,
+ &contained_str, 0,
+ &real_sub->u.writer);
+ }
+ else
+ {
+ return _dbus_type_writer_recurse (&real->u.writer,
+ type,
+ NULL, 0,
+ &real_sub->u.writer);
+ }
+}
+
+
+/**
+ * Closes a container-typed value appended to the message; may write
+ * out more information to the message known only after the entire
+ * container is written, and may free resources created by
+ * dbus_message_iter_open_container().
+ *
+ * @todo If this fails due to lack of memory, the message is hosed and
+ * you have to start over building the whole message.
+ *
+ * @param iter the append iterator
+ * @param sub sub-iterator to close
+ * @returns #FALSE if not enough memory
+ */
+dbus_bool_t
+dbus_message_iter_close_container (DBusMessageIter *iter,
+ DBusMessageIter *sub)
+{
+ DBusMessageRealIter *real = (DBusMessageRealIter *)iter;
+ DBusMessageRealIter *real_sub = (DBusMessageRealIter *)sub;
+ dbus_bool_t ret;
+
+ _dbus_return_val_if_fail (_dbus_message_iter_append_check (real), FALSE);
+ _dbus_return_val_if_fail (real->iter_type == DBUS_MESSAGE_ITER_TYPE_WRITER, FALSE);
+ _dbus_return_val_if_fail (_dbus_message_iter_append_check (real_sub), FALSE);
+ _dbus_return_val_if_fail (real_sub->iter_type == DBUS_MESSAGE_ITER_TYPE_WRITER, FALSE);
+
+ ret = _dbus_type_writer_unrecurse (&real->u.writer,
+ &real_sub->u.writer);
+
+ if (!_dbus_message_iter_close_signature (real))
+ ret = FALSE;
+
+ return ret;
+}
+
+/**
+ * Sets a flag indicating that the message does not want a reply; if
+ * this flag is set, the other end of the connection may (but is not
+ * required to) optimize by not sending method return or error
+ * replies. If this flag is set, there is no way to know whether the
+ * message successfully arrived at the remote end. Normally you know a
+ * message was received when you receive the reply to it.
+ *
+ * The flag is #FALSE by default, that is by default the other end is
+ * required to reply.
+ *
+ * On the protocol level this toggles #DBUS_HEADER_FLAG_NO_REPLY_EXPECTED
+ *
+ * @param message the message
+ * @param no_reply #TRUE if no reply is desired
+ */
+void
+dbus_message_set_no_reply (DBusMessage *message,
+ dbus_bool_t no_reply)
+{
+ _dbus_return_if_fail (message != NULL);
+ _dbus_return_if_fail (!message->locked);
+
+ _dbus_header_toggle_flag (&message->header,
+ DBUS_HEADER_FLAG_NO_REPLY_EXPECTED,
+ no_reply);
+}
+
+/**
+ * Returns #TRUE if the message does not expect
+ * a reply.
+ *
+ * @param message the message
+ * @returns #TRUE if the message sender isn't waiting for a reply
+ */
+dbus_bool_t
+dbus_message_get_no_reply (DBusMessage *message)
+{
+ _dbus_return_val_if_fail (message != NULL, FALSE);
+
+ return _dbus_header_get_flag (&message->header,
+ DBUS_HEADER_FLAG_NO_REPLY_EXPECTED);
+}
+
+/**
+ * Sets a flag indicating that an owner for the destination name will
+ * be automatically started before the message is delivered. When this
+ * flag is set, the message is held until a name owner finishes
+ * starting up, or fails to start up. In case of failure, the reply
+ * will be an error.
+ *
+ * The flag is set to #TRUE by default, i.e. auto starting is the default.
+ *
+ * On the protocol level this toggles #DBUS_HEADER_FLAG_NO_AUTO_START
+ *
+ * @param message the message
+ * @param auto_start #TRUE if auto-starting is desired
+ */
+void
+dbus_message_set_auto_start (DBusMessage *message,
+ dbus_bool_t auto_start)
+{
+ _dbus_return_if_fail (message != NULL);
+ _dbus_return_if_fail (!message->locked);
+
+ _dbus_header_toggle_flag (&message->header,
+ DBUS_HEADER_FLAG_NO_AUTO_START,
+ !auto_start);
+}
+
+/**
+ * Returns #TRUE if the message will cause an owner for
+ * destination name to be auto-started.
+ *
+ * @param message the message
+ * @returns #TRUE if the message will use auto-start
+ */
+dbus_bool_t
+dbus_message_get_auto_start (DBusMessage *message)
+{
+ _dbus_return_val_if_fail (message != NULL, FALSE);
+
+ return !_dbus_header_get_flag (&message->header,
+ DBUS_HEADER_FLAG_NO_AUTO_START);
+}
+
+
+/**
+ * Sets the object path this message is being sent to (for
+ * DBUS_MESSAGE_TYPE_METHOD_CALL) or the one a signal is being
+ * emitted from (for DBUS_MESSAGE_TYPE_SIGNAL).
+ *
+ * The path must contain only valid characters as defined
+ * in the D-Bus specification.
+ *
+ * @param message the message
+ * @param object_path the path or #NULL to unset
+ * @returns #FALSE if not enough memory
+ */
+dbus_bool_t
+dbus_message_set_path (DBusMessage *message,
+ const char *object_path)
+{
+ _dbus_return_val_if_fail (message != NULL, FALSE);
+ _dbus_return_val_if_fail (!message->locked, FALSE);
+ _dbus_return_val_if_fail (object_path == NULL ||
+ _dbus_check_is_valid_path (object_path),
+ FALSE);
+
+ return set_or_delete_string_field (message,
+ DBUS_HEADER_FIELD_PATH,
+ DBUS_TYPE_OBJECT_PATH,
+ object_path);
+}
+
+/**
+ * Gets the object path this message is being sent to (for
+ * DBUS_MESSAGE_TYPE_METHOD_CALL) or being emitted from (for
+ * DBUS_MESSAGE_TYPE_SIGNAL). Returns #NULL if none.
+ *
+ * See also dbus_message_get_path_decomposed().
+ *
+ * The returned string becomes invalid if the message is
+ * modified, since it points into the wire-marshaled message data.
+ *
+ * @param message the message
+ * @returns the path (should not be freed) or #NULL
+ */
+const char*
+dbus_message_get_path (DBusMessage *message)
+{
+ const char *v;
+
+ _dbus_return_val_if_fail (message != NULL, NULL);
+
+ v = NULL; /* in case field doesn't exist */
+ _dbus_header_get_field_basic (&message->header,
+ DBUS_HEADER_FIELD_PATH,
+ DBUS_TYPE_OBJECT_PATH,
+ &v);
+ return v;
+}
+
+/**
+ * Checks if the message has a particular object path. The object
+ * path is the destination object for a method call or the emitting
+ * object for a signal.
+ *
+ * @param message the message
+ * @param path the path name
+ * @returns #TRUE if there is a path field in the header
+ */
+dbus_bool_t
+dbus_message_has_path (DBusMessage *message,
+ const char *path)
+{
+ const char *msg_path;
+ msg_path = dbus_message_get_path (message);
+
+ if (msg_path == NULL)
+ {
+ if (path == NULL)
+ return TRUE;
+ else
+ return FALSE;
+ }
+
+ if (path == NULL)
+ return FALSE;
+
+ if (strcmp (msg_path, path) == 0)
+ return TRUE;
+
+ return FALSE;
+}
+
+/**
+ * Gets the object path this message is being sent to
+ * (for DBUS_MESSAGE_TYPE_METHOD_CALL) or being emitted
+ * from (for DBUS_MESSAGE_TYPE_SIGNAL) in a decomposed
+ * format (one array element per path component).
+ * Free the returned array with dbus_free_string_array().
+ *
+ * An empty but non-NULL path array means the path "/".
+ * So the path "/foo/bar" becomes { "foo", "bar", NULL }
+ * and the path "/" becomes { NULL }.
+ *
+ * See also dbus_message_get_path().
+ *
+ * @todo this could be optimized by using the len from the message
+ * instead of calling strlen() again
+ *
+ * @param message the message
+ * @param path place to store allocated array of path components; #NULL set here if no path field exists
+ * @returns #FALSE if no memory to allocate the array
+ */
+dbus_bool_t
+dbus_message_get_path_decomposed (DBusMessage *message,
+ char ***path)
+{
+ const char *v;
+
+ _dbus_return_val_if_fail (message != NULL, FALSE);
+ _dbus_return_val_if_fail (path != NULL, FALSE);
+
+ *path = NULL;
+
+ v = dbus_message_get_path (message);
+ if (v != NULL)
+ {
+ if (!_dbus_decompose_path (v, strlen (v),
+ path, NULL))
+ return FALSE;
+ }
+ return TRUE;
+}
+
+/**
+ * Sets the interface this message is being sent to
+ * (for DBUS_MESSAGE_TYPE_METHOD_CALL) or
+ * the interface a signal is being emitted from
+ * (for DBUS_MESSAGE_TYPE_SIGNAL).
+ *
+ * The interface name must contain only valid characters as defined
+ * in the D-Bus specification.
+ *
+ * @param message the message
+ * @param interface the interface or #NULL to unset
+ * @returns #FALSE if not enough memory
+ */
+dbus_bool_t
+dbus_message_set_interface (DBusMessage *message,
+ const char *interface)
+{
+ _dbus_return_val_if_fail (message != NULL, FALSE);
+ _dbus_return_val_if_fail (!message->locked, FALSE);
+ _dbus_return_val_if_fail (interface == NULL ||
+ _dbus_check_is_valid_interface (interface),
+ FALSE);
+
+ return set_or_delete_string_field (message,
+ DBUS_HEADER_FIELD_INTERFACE,
+ DBUS_TYPE_STRING,
+ interface);
+}
+
+/**
+ * Gets the interface this message is being sent to
+ * (for DBUS_MESSAGE_TYPE_METHOD_CALL) or being emitted
+ * from (for DBUS_MESSAGE_TYPE_SIGNAL).
+ * The interface name is fully-qualified (namespaced).
+ * Returns #NULL if none.
+ *
+ * The returned string becomes invalid if the message is
+ * modified, since it points into the wire-marshaled message data.
+ *
+ * @param message the message
+ * @returns the message interface (should not be freed) or #NULL
+ */
+const char*
+dbus_message_get_interface (DBusMessage *message)
+{
+ const char *v;
+
+ _dbus_return_val_if_fail (message != NULL, NULL);
+
+ v = NULL; /* in case field doesn't exist */
+ _dbus_header_get_field_basic (&message->header,
+ DBUS_HEADER_FIELD_INTERFACE,
+ DBUS_TYPE_STRING,
+ &v);
+ return v;
+}
+
+/**
+ * Checks if the message has an interface
+ *
+ * @param message the message
+ * @param interface the interface name
+ * @returns #TRUE if the interface field in the header matches
+ */
+dbus_bool_t
+dbus_message_has_interface (DBusMessage *message,
+ const char *interface)
+{
+ const char *msg_interface;
+ msg_interface = dbus_message_get_interface (message);
+
+ if (msg_interface == NULL)
+ {
+ if (interface == NULL)
+ return TRUE;
+ else
+ return FALSE;
+ }
+
+ if (interface == NULL)
+ return FALSE;
+
+ if (strcmp (msg_interface, interface) == 0)
+ return TRUE;
+
+ return FALSE;
+
+}
+
+/**
+ * Sets the interface member being invoked
+ * (DBUS_MESSAGE_TYPE_METHOD_CALL) or emitted
+ * (DBUS_MESSAGE_TYPE_SIGNAL).
+ *
+ * The member name must contain only valid characters as defined
+ * in the D-Bus specification.
+ *
+ * @param message the message
+ * @param member the member or #NULL to unset
+ * @returns #FALSE if not enough memory
+ */
+dbus_bool_t
+dbus_message_set_member (DBusMessage *message,
+ const char *member)
+{
+ _dbus_return_val_if_fail (message != NULL, FALSE);
+ _dbus_return_val_if_fail (!message->locked, FALSE);
+ _dbus_return_val_if_fail (member == NULL ||
+ _dbus_check_is_valid_member (member),
+ FALSE);
+
+ return set_or_delete_string_field (message,
+ DBUS_HEADER_FIELD_MEMBER,
+ DBUS_TYPE_STRING,
+ member);
+}
+
+/**
+ * Gets the interface member being invoked
+ * (DBUS_MESSAGE_TYPE_METHOD_CALL) or emitted
+ * (DBUS_MESSAGE_TYPE_SIGNAL). Returns #NULL if none.
+ *
+ * The returned string becomes invalid if the message is
+ * modified, since it points into the wire-marshaled message data.
+ *
+ * @param message the message
+ * @returns the member name (should not be freed) or #NULL
+ */
+const char*
+dbus_message_get_member (DBusMessage *message)
+{
+ const char *v;
+
+ _dbus_return_val_if_fail (message != NULL, NULL);
+
+ v = NULL; /* in case field doesn't exist */
+ _dbus_header_get_field_basic (&message->header,
+ DBUS_HEADER_FIELD_MEMBER,
+ DBUS_TYPE_STRING,
+ &v);
+ return v;
+}
+
+/**
+ * Checks if the message has an interface member
+ *
+ * @param message the message
+ * @param member the member name
+ * @returns #TRUE if there is a member field in the header
+ */
+dbus_bool_t
+dbus_message_has_member (DBusMessage *message,
+ const char *member)
+{
+ const char *msg_member;
+ msg_member = dbus_message_get_member (message);
+
+ if (msg_member == NULL)
+ {
+ if (member == NULL)
+ return TRUE;
+ else
+ return FALSE;
+ }
+
+ if (member == NULL)
+ return FALSE;
+
+ if (strcmp (msg_member, member) == 0)
+ return TRUE;
+
+ return FALSE;
+
+}
+
+/**
+ * Sets the name of the error (DBUS_MESSAGE_TYPE_ERROR).
+ * The name is fully-qualified (namespaced).
+ *
+ * The error name must contain only valid characters as defined
+ * in the D-Bus specification.
+ *
+ * @param message the message
+ * @param error_name the name or #NULL to unset
+ * @returns #FALSE if not enough memory
+ */
+dbus_bool_t
+dbus_message_set_error_name (DBusMessage *message,
+ const char *error_name)
+{
+ _dbus_return_val_if_fail (message != NULL, FALSE);
+ _dbus_return_val_if_fail (!message->locked, FALSE);
+ _dbus_return_val_if_fail (error_name == NULL ||
+ _dbus_check_is_valid_error_name (error_name),
+ FALSE);
+
+ return set_or_delete_string_field (message,
+ DBUS_HEADER_FIELD_ERROR_NAME,
+ DBUS_TYPE_STRING,
+ error_name);
+}
+
+/**
+ * Gets the error name (DBUS_MESSAGE_TYPE_ERROR only)
+ * or #NULL if none.
+ *
+ * The returned string becomes invalid if the message is
+ * modified, since it points into the wire-marshaled message data.
+ *
+ * @param message the message
+ * @returns the error name (should not be freed) or #NULL
+ */
+const char*
+dbus_message_get_error_name (DBusMessage *message)
+{
+ const char *v;
+
+ _dbus_return_val_if_fail (message != NULL, NULL);
+
+ v = NULL; /* in case field doesn't exist */
+ _dbus_header_get_field_basic (&message->header,
+ DBUS_HEADER_FIELD_ERROR_NAME,
+ DBUS_TYPE_STRING,
+ &v);
+ return v;
+}
+
+/**
+ * Sets the message's destination. The destination is the name of
+ * another connection on the bus and may be either the unique name
+ * assigned by the bus to each connection, or a well-known name
+ * specified in advance.
+ *
+ * The destination name must contain only valid characters as defined
+ * in the D-Bus specification.
+ *
+ * @param message the message
+ * @param destination the destination name or #NULL to unset
+ * @returns #FALSE if not enough memory
+ */
+dbus_bool_t
+dbus_message_set_destination (DBusMessage *message,
+ const char *destination)
+{
+ _dbus_return_val_if_fail (message != NULL, FALSE);
+ _dbus_return_val_if_fail (!message->locked, FALSE);
+ _dbus_return_val_if_fail (destination == NULL ||
+ _dbus_check_is_valid_bus_name (destination),
+ FALSE);
+
+ return set_or_delete_string_field (message,
+ DBUS_HEADER_FIELD_DESTINATION,
+ DBUS_TYPE_STRING,
+ destination);
+}
+
+/**
+ * Gets the destination of a message or #NULL if there is none set.
+ *
+ * The returned string becomes invalid if the message is
+ * modified, since it points into the wire-marshaled message data.
+ *
+ * @param message the message
+ * @returns the message destination (should not be freed) or #NULL
+ */
+const char*
+dbus_message_get_destination (DBusMessage *message)
+{
+ const char *v;
+
+ _dbus_return_val_if_fail (message != NULL, NULL);
+
+ v = NULL; /* in case field doesn't exist */
+ _dbus_header_get_field_basic (&message->header,
+ DBUS_HEADER_FIELD_DESTINATION,
+ DBUS_TYPE_STRING,
+ &v);
+ return v;
+}
+
+/**
+ * Sets the message sender.
+ *
+ * The sender must be a valid bus name as defined in the D-Bus
+ * specification.
+ *
+ * Usually you don't want to call this. The message bus daemon will
+ * call it to set the origin of each message. If you aren't implementing
+ * a message bus daemon you shouldn't need to set the sender.
+ *
+ * @param message the message
+ * @param sender the sender or #NULL to unset
+ * @returns #FALSE if not enough memory
+ */
+dbus_bool_t
+dbus_message_set_sender (DBusMessage *message,
+ const char *sender)
+{
+ _dbus_return_val_if_fail (message != NULL, FALSE);
+ _dbus_return_val_if_fail (!message->locked, FALSE);
+ _dbus_return_val_if_fail (sender == NULL ||
+ _dbus_check_is_valid_bus_name (sender),
+ FALSE);
+
+ return set_or_delete_string_field (message,
+ DBUS_HEADER_FIELD_SENDER,
+ DBUS_TYPE_STRING,
+ sender);
+}
+
+/**
+ * Gets the unique name of the connection which originated this
+ * message, or #NULL if unknown or inapplicable. The sender is filled
+ * in by the message bus.
+ *
+ * Note, the returned sender is always the unique bus name.
+ * Connections may own multiple other bus names, but those
+ * are not found in the sender field.
+ *
+ * The returned string becomes invalid if the message is
+ * modified, since it points into the wire-marshaled message data.
+ *
+ * @param message the message
+ * @returns the unique name of the sender or #NULL
+ */
+const char*
+dbus_message_get_sender (DBusMessage *message)
+{
+ const char *v;
+
+ _dbus_return_val_if_fail (message != NULL, NULL);
+
+ v = NULL; /* in case field doesn't exist */
+ _dbus_header_get_field_basic (&message->header,
+ DBUS_HEADER_FIELD_SENDER,
+ DBUS_TYPE_STRING,
+ &v);
+ return v;
+}
+
+/**
+ * Gets the type signature of the message, i.e. the arguments in the
+ * message payload. The signature includes only "in" arguments for
+ * #DBUS_MESSAGE_TYPE_METHOD_CALL and only "out" arguments for
+ * #DBUS_MESSAGE_TYPE_METHOD_RETURN, so is slightly different from
+ * what you might expect (that is, it does not include the signature of the
+ * entire C++-style method).
+ *
+ * The signature is a string made up of type codes such as
+ * #DBUS_TYPE_INT32. The string is terminated with nul (nul is also
+ * the value of #DBUS_TYPE_INVALID).
+ *
+ * The returned string becomes invalid if the message is
+ * modified, since it points into the wire-marshaled message data.
+ *
+ * @param message the message
+ * @returns the type signature
+ */
+const char*
+dbus_message_get_signature (DBusMessage *message)
+{
+ const DBusString *type_str;
+ int type_pos;
+
+ _dbus_return_val_if_fail (message != NULL, NULL);
+
+ get_const_signature (&message->header, &type_str, &type_pos);
+
+ return _dbus_string_get_const_data_len (type_str, type_pos, 0);
+}
+
+static dbus_bool_t
+_dbus_message_has_type_interface_member (DBusMessage *message,
+ int type,
+ const char *interface,
+ const char *member)
+{
+ const char *n;
+
+ _dbus_assert (message != NULL);
+ _dbus_assert (interface != NULL);
+ _dbus_assert (member != NULL);
+
+ if (dbus_message_get_type (message) != type)
+ return FALSE;
+
+ /* Optimize by checking the short member name first
+ * instead of the longer interface name
+ */
+
+ n = dbus_message_get_member (message);
+
+ if (n && strcmp (n, member) == 0)
+ {
+ n = dbus_message_get_interface (message);
+
+ if (n == NULL || strcmp (n, interface) == 0)
+ return TRUE;
+ }
+
+ return FALSE;
+}
+
+/**
+ * Checks whether the message is a method call with the given
+ * interface and member fields. If the message is not
+ * #DBUS_MESSAGE_TYPE_METHOD_CALL, or has a different interface or
+ * member field, returns #FALSE. If the interface field is missing,
+ * then it will be assumed equal to the provided interface. The D-Bus
+ * protocol allows method callers to leave out the interface name.
+ *
+ * @param message the message
+ * @param interface the name to check (must not be #NULL)
+ * @param method the name to check (must not be #NULL)
+ *
+ * @returns #TRUE if the message is the specified method call
+ */
+dbus_bool_t
+dbus_message_is_method_call (DBusMessage *message,
+ const char *interface,
+ const char *method)
+{
+ _dbus_return_val_if_fail (message != NULL, FALSE);
+ _dbus_return_val_if_fail (interface != NULL, FALSE);
+ _dbus_return_val_if_fail (method != NULL, FALSE);
+ /* don't check that interface/method are valid since it would be
+ * expensive, and not catch many common errors
+ */
+
+ return _dbus_message_has_type_interface_member (message,
+ DBUS_MESSAGE_TYPE_METHOD_CALL,
+ interface, method);
+}
+
+/**
+ * Checks whether the message is a signal with the given interface and
+ * member fields. If the message is not #DBUS_MESSAGE_TYPE_SIGNAL, or
+ * has a different interface or member field, returns #FALSE.
+ *
+ * @param message the message
+ * @param interface the name to check (must not be #NULL)
+ * @param signal_name the name to check (must not be #NULL)
+ *
+ * @returns #TRUE if the message is the specified signal
+ */
+dbus_bool_t
+dbus_message_is_signal (DBusMessage *message,
+ const char *interface,
+ const char *signal_name)
+{
+ _dbus_return_val_if_fail (message != NULL, FALSE);
+ _dbus_return_val_if_fail (interface != NULL, FALSE);
+ _dbus_return_val_if_fail (signal_name != NULL, FALSE);
+ /* don't check that interface/name are valid since it would be
+ * expensive, and not catch many common errors
+ */
+
+ return _dbus_message_has_type_interface_member (message,
+ DBUS_MESSAGE_TYPE_SIGNAL,
+ interface, signal_name);
+}
+
+/**
+ * Checks whether the message is an error reply with the given error
+ * name. If the message is not #DBUS_MESSAGE_TYPE_ERROR, or has a
+ * different name, returns #FALSE.
+ *
+ * @param message the message
+ * @param error_name the name to check (must not be #NULL)
+ *
+ * @returns #TRUE if the message is the specified error
+ */
+dbus_bool_t
+dbus_message_is_error (DBusMessage *message,
+ const char *error_name)
+{
+ const char *n;
+
+ _dbus_return_val_if_fail (message != NULL, FALSE);
+ _dbus_return_val_if_fail (error_name != NULL, FALSE);
+ /* don't check that error_name is valid since it would be expensive,
+ * and not catch many common errors
+ */
+
+ if (dbus_message_get_type (message) != DBUS_MESSAGE_TYPE_ERROR)
+ return FALSE;
+
+ n = dbus_message_get_error_name (message);
+
+ if (n && strcmp (n, error_name) == 0)
+ return TRUE;
+ else
+ return FALSE;
+}
+
+/**
+ * Checks whether the message was sent to the given name. If the
+ * message has no destination specified or has a different
+ * destination, returns #FALSE.
+ *
+ * @param message the message
+ * @param name the name to check (must not be #NULL)
+ *
+ * @returns #TRUE if the message has the given destination name
+ */
+dbus_bool_t
+dbus_message_has_destination (DBusMessage *message,
+ const char *name)
+{
+ const char *s;
+
+ _dbus_return_val_if_fail (message != NULL, FALSE);
+ _dbus_return_val_if_fail (name != NULL, FALSE);
+ /* don't check that name is valid since it would be expensive, and
+ * not catch many common errors
+ */
+
+ s = dbus_message_get_destination (message);
+
+ if (s && strcmp (s, name) == 0)
+ return TRUE;
+ else
+ return FALSE;
+}
+
+/**
+ * Checks whether the message has the given unique name as its sender.
+ * If the message has no sender specified or has a different sender,
+ * returns #FALSE. Note that a peer application will always have the
+ * unique name of the connection as the sender. So you can't use this
+ * function to see whether a sender owned a well-known name.
+ *
+ * Messages from the bus itself will have #DBUS_SERVICE_DBUS
+ * as the sender.
+ *
+ * @param message the message
+ * @param name the name to check (must not be #NULL)
+ *
+ * @returns #TRUE if the message has the given sender
+ */
+dbus_bool_t
+dbus_message_has_sender (DBusMessage *message,
+ const char *name)
+{
+ const char *s;
+
+ _dbus_return_val_if_fail (message != NULL, FALSE);
+ _dbus_return_val_if_fail (name != NULL, FALSE);
+ /* don't check that name is valid since it would be expensive, and
+ * not catch many common errors
+ */
+
+ s = dbus_message_get_sender (message);
+
+ if (s && strcmp (s, name) == 0)
+ return TRUE;
+ else
+ return FALSE;
+}
+
+/**
+ * Checks whether the message has the given signature; see
+ * dbus_message_get_signature() for more details on what the signature
+ * looks like.
+ *
+ * @param message the message
+ * @param signature typecode array
+ * @returns #TRUE if message has the given signature
+*/
+dbus_bool_t
+dbus_message_has_signature (DBusMessage *message,
+ const char *signature)
+{
+ const char *s;
+
+ _dbus_return_val_if_fail (message != NULL, FALSE);
+ _dbus_return_val_if_fail (signature != NULL, FALSE);
+ /* don't check that signature is valid since it would be expensive,
+ * and not catch many common errors
+ */
+
+ s = dbus_message_get_signature (message);
+
+ if (s && strcmp (s, signature) == 0)
+ return TRUE;
+ else
+ return FALSE;
+}
+
+/**
+ * Sets a #DBusError based on the contents of the given
+ * message. The error is only set if the message
+ * is an error message, as in #DBUS_MESSAGE_TYPE_ERROR.
+ * The name of the error is set to the name of the message,
+ * and the error message is set to the first argument
+ * if the argument exists and is a string.
+ *
+ * The return value indicates whether the error was set (the error is
+ * set if and only if the message is an error message). So you can
+ * check for an error reply and convert it to DBusError in one go:
+ * @code
+ * if (dbus_set_error_from_message (error, reply))
+ * return error;
+ * else
+ * process reply;
+ * @endcode
+ *
+ * @param error the error to set
+ * @param message the message to set it from
+ * @returns #TRUE if the message had type #DBUS_MESSAGE_TYPE_ERROR
+ */
+dbus_bool_t
+dbus_set_error_from_message (DBusError *error,
+ DBusMessage *message)
+{
+ const char *str;
+
+ _dbus_return_val_if_fail (message != NULL, FALSE);
+ _dbus_return_val_if_error_is_set (error, FALSE);
+
+ if (dbus_message_get_type (message) != DBUS_MESSAGE_TYPE_ERROR)
+ return FALSE;
+
+ str = NULL;
+ dbus_message_get_args (message, NULL,
+ DBUS_TYPE_STRING, &str,
+ DBUS_TYPE_INVALID);
+
+ dbus_set_error (error, dbus_message_get_error_name (message),
+ str ? "%s" : NULL, str);
+
+ return TRUE;
+}
+
+/** @} */
+
+/**
+ * @addtogroup DBusMessageInternals
+ *
+ * @{
+ */
+
+/**
+ * The initial buffer size of the message loader.
+ *
+ * @todo this should be based on min header size plus some average
+ * body size, or something. Or rather, the min header size only, if we
+ * want to try to read only the header, store that in a DBusMessage,
+ * then read only the body and store that, etc., depends on
+ * how we optimize _dbus_message_loader_get_buffer() and what
+ * the exact message format is.
+ */
+#define INITIAL_LOADER_DATA_LEN 32
+
+/**
+ * Creates a new message loader. Returns #NULL if memory can't
+ * be allocated.
+ *
+ * @returns new loader, or #NULL.
+ */
+DBusMessageLoader*
+_dbus_message_loader_new (void)
+{
+ DBusMessageLoader *loader;
+
+ loader = dbus_new0 (DBusMessageLoader, 1);
+ if (loader == NULL)
+ return NULL;
+
+ loader->refcount = 1;
+
+ loader->corrupted = FALSE;
+ loader->corruption_reason = DBUS_VALID;
+
+ /* this can be configured by the app, but defaults to the protocol max */
+ loader->max_message_size = DBUS_MAXIMUM_MESSAGE_LENGTH;
+
+ if (!_dbus_string_init (&loader->data))
+ {
+ dbus_free (loader);
+ return NULL;
+ }
+
+ /* preallocate the buffer for speed, ignore failure */
+ _dbus_string_set_length (&loader->data, INITIAL_LOADER_DATA_LEN);
+ _dbus_string_set_length (&loader->data, 0);
+
+ return loader;
+}
+
+/**
+ * Increments the reference count of the loader.
+ *
+ * @param loader the loader.
+ * @returns the loader
+ */
+DBusMessageLoader *
+_dbus_message_loader_ref (DBusMessageLoader *loader)
+{
+ loader->refcount += 1;
+
+ return loader;
+}
+
+/**
+ * Decrements the reference count of the loader and finalizes the
+ * loader when the count reaches zero.
+ *
+ * @param loader the loader.
+ */
+void
+_dbus_message_loader_unref (DBusMessageLoader *loader)
+{
+ loader->refcount -= 1;
+ if (loader->refcount == 0)
+ {
+ _dbus_list_foreach (&loader->messages,
+ (DBusForeachFunction) dbus_message_unref,
+ NULL);
+ _dbus_list_clear (&loader->messages);
+ _dbus_string_free (&loader->data);
+ dbus_free (loader);
+ }
+}
+
+/**
+ * Gets the buffer to use for reading data from the network. Network
+ * data is read directly into an allocated buffer, which is then used
+ * in the DBusMessage, to avoid as many extra memcpy's as possible.
+ * The buffer must always be returned immediately using
+ * _dbus_message_loader_return_buffer(), even if no bytes are
+ * successfully read.
+ *
+ * @todo this function can be a lot more clever. For example
+ * it can probably always return a buffer size to read exactly
+ * the body of the next message, thus avoiding any memory wastage
+ * or reallocs.
+ *
+ * @todo we need to enforce a max length on strings in header fields.
+ *
+ * @param loader the message loader.
+ * @param buffer the buffer
+ */
+void
+_dbus_message_loader_get_buffer (DBusMessageLoader *loader,
+ DBusString **buffer)
+{
+ _dbus_assert (!loader->buffer_outstanding);
+
+ *buffer = &loader->data;
+
+ loader->buffer_outstanding = TRUE;
+}
+
+/**
+ * Returns a buffer obtained from _dbus_message_loader_get_buffer(),
+ * indicating to the loader how many bytes of the buffer were filled
+ * in. This function must always be called, even if no bytes were
+ * successfully read.
+ *
+ * @param loader the loader.
+ * @param buffer the buffer.
+ * @param bytes_read number of bytes that were read into the buffer.
+ */
+void
+_dbus_message_loader_return_buffer (DBusMessageLoader *loader,
+ DBusString *buffer,
+ int bytes_read)
+{
+ _dbus_assert (loader->buffer_outstanding);
+ _dbus_assert (buffer == &loader->data);
+
+ loader->buffer_outstanding = FALSE;
+}
+
+/*
+ * FIXME when we move the header out of the buffer, that memmoves all
+ * buffered messages. Kind of crappy.
+ *
+ * Also we copy the header and body, which is kind of crappy. To
+ * avoid this, we have to allow header and body to be in a single
+ * memory block, which is good for messages we read and bad for
+ * messages we are creating. But we could move_len() the buffer into
+ * this single memory block, and move_len() will just swap the buffers
+ * if you're moving the entire buffer replacing the dest string.
+ *
+ * We could also have the message loader tell the transport how many
+ * bytes to read; so it would first ask for some arbitrary number like
+ * 256, then if the message was incomplete it would use the
+ * header/body len to ask for exactly the size of the message (or
+ * blocks the size of a typical kernel buffer for the socket). That
+ * way we don't get trailing bytes in the buffer that have to be
+ * memmoved. Though I suppose we also don't have a chance of reading a
+ * bunch of small messages at once, so the optimization may be stupid.
+ *
+ * Another approach would be to keep a "start" index into
+ * loader->data and only delete it occasionally, instead of after
+ * each message is loaded.
+ *
+ * load_message() returns FALSE if not enough memory OR the loader was corrupted
+ */
+static dbus_bool_t
+load_message (DBusMessageLoader *loader,
+ DBusMessage *message,
+ int byte_order,
+ int fields_array_len,
+ int header_len,
+ int body_len)
+{
+ dbus_bool_t oom;
+ DBusValidity validity;
+ const DBusString *type_str;
+ int type_pos;
+ DBusValidationMode mode;
+
+ mode = DBUS_VALIDATION_MODE_DATA_IS_UNTRUSTED;
+
+ oom = FALSE;
+
+#if 0
+ _dbus_verbose_bytes_of_string (&loader->data, 0, header_len /* + body_len */);
+#endif
+
+ /* 1. VALIDATE AND COPY OVER HEADER */
+ _dbus_assert (_dbus_string_get_length (&message->header.data) == 0);
+ _dbus_assert ((header_len + body_len) <= _dbus_string_get_length (&loader->data));
+
+ if (!_dbus_header_load (&message->header,
+ mode,
+ &validity,
+ byte_order,
+ fields_array_len,
+ header_len,
+ body_len,
+ &loader->data, 0,
+ _dbus_string_get_length (&loader->data)))
+ {
+ _dbus_verbose ("Failed to load header for new message code %d\n", validity);
+
+ /* assert here so we can catch any code that still uses DBUS_VALID to indicate
+ oom errors. They should use DBUS_VALIDITY_UNKNOWN_OOM_ERROR instead */
+ _dbus_assert (validity != DBUS_VALID);
+
+ if (validity == DBUS_VALIDITY_UNKNOWN_OOM_ERROR)
+ oom = TRUE;
+ else
+ {
+ loader->corrupted = TRUE;
+ loader->corruption_reason = validity;
+ }
+ goto failed;
+ }
+
+ _dbus_assert (validity == DBUS_VALID);
+
+ message->byte_order = byte_order;
+
+ /* 2. VALIDATE BODY */
+ if (mode != DBUS_VALIDATION_MODE_WE_TRUST_THIS_DATA_ABSOLUTELY)
+ {
+ get_const_signature (&message->header, &type_str, &type_pos);
+
+ /* Because the bytes_remaining arg is NULL, this validates that the
+ * body is the right length
+ */
+ validity = _dbus_validate_body_with_reason (type_str,
+ type_pos,
+ byte_order,
+ NULL,
+ &loader->data,
+ header_len,
+ body_len);
+ if (validity != DBUS_VALID)
+ {
+ _dbus_verbose ("Failed to validate message body code %d\n", validity);
+
+ loader->corrupted = TRUE;
+ loader->corruption_reason = validity;
+
+ goto failed;
+ }
+ }
+
+ /* 3. COPY OVER BODY AND QUEUE MESSAGE */
+
+ if (!_dbus_list_append (&loader->messages, message))
+ {
+ _dbus_verbose ("Failed to append new message to loader queue\n");
+ oom = TRUE;
+ goto failed;
+ }
+
+ _dbus_assert (_dbus_string_get_length (&message->body) == 0);
+ _dbus_assert (_dbus_string_get_length (&loader->data) >=
+ (header_len + body_len));
+
+ if (!_dbus_string_copy_len (&loader->data, header_len, body_len, &message->body, 0))
+ {
+ _dbus_verbose ("Failed to move body into new message\n");
+ oom = TRUE;
+ goto failed;
+ }
+
+ _dbus_string_delete (&loader->data, 0, header_len + body_len);
+
+ /* don't waste more than 2k of memory */
+ _dbus_string_compact (&loader->data, 2048);
+
+ _dbus_assert (_dbus_string_get_length (&message->header.data) == header_len);
+ _dbus_assert (_dbus_string_get_length (&message->body) == body_len);
+
+ _dbus_verbose ("Loaded message %p\n", message);
+
+ _dbus_assert (!oom);
+ _dbus_assert (!loader->corrupted);
+ _dbus_assert (loader->messages != NULL);
+ _dbus_assert (_dbus_list_find_last (&loader->messages, message) != NULL);
+
+ return TRUE;
+
+ failed:
+
+ /* Clean up */
+
+ /* does nothing if the message isn't in the list */
+ _dbus_list_remove_last (&loader->messages, message);
+
+ if (oom)
+ _dbus_assert (!loader->corrupted);
+ else
+ _dbus_assert (loader->corrupted);
+
+ _dbus_verbose_bytes_of_string (&loader->data, 0, _dbus_string_get_length (&loader->data));
+
+ return FALSE;
+}
+
+/**
+ * Converts buffered data into messages, if we have enough data. If
+ * we don't have enough data, does nothing.
+ *
+ * @todo we need to check that the proper named header fields exist
+ * for each message type.
+ *
+ * @todo If a message has unknown type, we should probably eat it
+ * right here rather than passing it out to applications. However
+ * it's not an error to see messages of unknown type.
+ *
+ * @param loader the loader.
+ * @returns #TRUE if we had enough memory to finish.
+ */
+dbus_bool_t
+_dbus_message_loader_queue_messages (DBusMessageLoader *loader)
+{
+ while (!loader->corrupted &&
+ _dbus_string_get_length (&loader->data) >= DBUS_MINIMUM_HEADER_SIZE)
+ {
+ DBusValidity validity;
+ int byte_order, fields_array_len, header_len, body_len;
+
+ if (_dbus_header_have_message_untrusted (loader->max_message_size,
+ &validity,
+ &byte_order,
+ &fields_array_len,
+ &header_len,
+ &body_len,
+ &loader->data, 0,
+ _dbus_string_get_length (&loader->data)))
+ {
+ DBusMessage *message;
+
+ _dbus_assert (validity == DBUS_VALID);
+
+ message = dbus_message_new_empty_header ();
+ if (message == NULL)
+ return FALSE;
+
+ if (!load_message (loader, message,
+ byte_order, fields_array_len,
+ header_len, body_len))
+ {
+ dbus_message_unref (message);
+ /* load_message() returns false if corrupted or OOM; if
+ * corrupted then return TRUE for not OOM
+ */
+ return loader->corrupted;
+ }
+
+ _dbus_assert (loader->messages != NULL);
+ _dbus_assert (_dbus_list_find_last (&loader->messages, message) != NULL);
+ }
+ else
+ {
+ _dbus_verbose ("Initial peek at header says we don't have a whole message yet, or data broken with invalid code %d\n",
+ validity);
+ if (validity != DBUS_VALID)
+ {
+ loader->corrupted = TRUE;
+ loader->corruption_reason = validity;
+ }
+ return TRUE;
+ }
+ }
+
+ return TRUE;
+}
+
+/**
+ * Peeks at first loaded message, returns #NULL if no messages have
+ * been queued.
+ *
+ * @param loader the loader.
+ * @returns the next message, or #NULL if none.
+ */
+DBusMessage*
+_dbus_message_loader_peek_message (DBusMessageLoader *loader)
+{
+ if (loader->messages)
+ return loader->messages->data;
+ else
+ return NULL;
+}
+
+/**
+ * Pops a loaded message (passing ownership of the message
+ * to the caller). Returns #NULL if no messages have been
+ * queued.
+ *
+ * @param loader the loader.
+ * @returns the next message, or #NULL if none.
+ */
+DBusMessage*
+_dbus_message_loader_pop_message (DBusMessageLoader *loader)
+{
+ return _dbus_list_pop_first (&loader->messages);
+}
+
+/**
+ * Pops a loaded message inside a list link (passing ownership of the
+ * message and link to the caller). Returns #NULL if no messages have
+ * been loaded.
+ *
+ * @param loader the loader.
+ * @returns the next message link, or #NULL if none.
+ */
+DBusList*
+_dbus_message_loader_pop_message_link (DBusMessageLoader *loader)
+{
+ return _dbus_list_pop_first_link (&loader->messages);
+}
+
+/**
+ * Returns a popped message link, used to undo a pop.
+ *
+ * @param loader the loader
+ * @param link the link with a message in it
+ */
+void
+_dbus_message_loader_putback_message_link (DBusMessageLoader *loader,
+ DBusList *link)
+{
+ _dbus_list_prepend_link (&loader->messages, link);
+}
+
+/**
+ * Checks whether the loader is confused due to bad data.
+ * If messages are received that are invalid, the
+ * loader gets confused and gives up permanently.
+ * This state is called "corrupted."
+ *
+ * @param loader the loader
+ * @returns #TRUE if the loader is hosed.
+ */
+dbus_bool_t
+_dbus_message_loader_get_is_corrupted (DBusMessageLoader *loader)
+{
+ _dbus_assert ((loader->corrupted && loader->corruption_reason != DBUS_VALID) ||
+ (!loader->corrupted && loader->corruption_reason == DBUS_VALID));
+ return loader->corrupted;
+}
+
+/**
+ * Sets the maximum size message we allow.
+ *
+ * @param loader the loader
+ * @param size the max message size in bytes
+ */
+void
+_dbus_message_loader_set_max_message_size (DBusMessageLoader *loader,
+ long size)
+{
+ if (size > DBUS_MAXIMUM_MESSAGE_LENGTH)
+ {
+ _dbus_verbose ("clamping requested max message size %ld to %d\n",
+ size, DBUS_MAXIMUM_MESSAGE_LENGTH);
+ size = DBUS_MAXIMUM_MESSAGE_LENGTH;
+ }
+ loader->max_message_size = size;
+}
+
+/**
+ * Gets the maximum allowed message size in bytes.
+ *
+ * @param loader the loader
+ * @returns max size in bytes
+ */
+long
+_dbus_message_loader_get_max_message_size (DBusMessageLoader *loader)
+{
+ return loader->max_message_size;
+}
+
+static DBusDataSlotAllocator slot_allocator;
+_DBUS_DEFINE_GLOBAL_LOCK (message_slots);
+
+/**
+ * Allocates an integer ID to be used for storing application-specific
+ * data on any DBusMessage. The allocated ID may then be used
+ * with dbus_message_set_data() and dbus_message_get_data().
+ * The passed-in slot must be initialized to -1, and is filled in
+ * with the slot ID. If the passed-in slot is not -1, it's assumed
+ * to be already allocated, and its refcount is incremented.
+ *
+ * The allocated slot is global, i.e. all DBusMessage objects will
+ * have a slot with the given integer ID reserved.
+ *
+ * @param slot_p address of a global variable storing the slot
+ * @returns #FALSE on failure (no memory)
+ */
+dbus_bool_t
+dbus_message_allocate_data_slot (dbus_int32_t *slot_p)
+{
+ return _dbus_data_slot_allocator_alloc (&slot_allocator,
+ &_DBUS_LOCK_NAME (message_slots),
+ slot_p);
+}
+
+/**
+ * Deallocates a global ID for message data slots.
+ * dbus_message_get_data() and dbus_message_set_data() may no
+ * longer be used with this slot. Existing data stored on existing
+ * DBusMessage objects will be freed when the message is
+ * finalized, but may not be retrieved (and may only be replaced if
+ * someone else reallocates the slot). When the refcount on the
+ * passed-in slot reaches 0, it is set to -1.
+ *
+ * @param slot_p address storing the slot to deallocate
+ */
+void
+dbus_message_free_data_slot (dbus_int32_t *slot_p)
+{
+ _dbus_return_if_fail (*slot_p >= 0);
+
+ _dbus_data_slot_allocator_free (&slot_allocator, slot_p);
+}
+
+/**
+ * Stores a pointer on a DBusMessage, along
+ * with an optional function to be used for freeing
+ * the data when the data is set again, or when
+ * the message is finalized. The slot number
+ * must have been allocated with dbus_message_allocate_data_slot().
+ *
+ * @param message the message
+ * @param slot the slot number
+ * @param data the data to store
+ * @param free_data_func finalizer function for the data
+ * @returns #TRUE if there was enough memory to store the data
+ */
+dbus_bool_t
+dbus_message_set_data (DBusMessage *message,
+ dbus_int32_t slot,
+ void *data,
+ DBusFreeFunction free_data_func)
+{
+ DBusFreeFunction old_free_func;
+ void *old_data;
+ dbus_bool_t retval;
+
+ _dbus_return_val_if_fail (message != NULL, FALSE);
+ _dbus_return_val_if_fail (slot >= 0, FALSE);
+
+ retval = _dbus_data_slot_list_set (&slot_allocator,
+ &message->slot_list,
+ slot, data, free_data_func,
+ &old_free_func, &old_data);
+
+ if (retval)
+ {
+ /* Do the actual free outside the message lock */
+ if (old_free_func)
+ (* old_free_func) (old_data);
+ }
+
+ return retval;
+}
+
+/**
+ * Retrieves data previously set with dbus_message_set_data().
+ * The slot must still be allocated (must not have been freed).
+ *
+ * @param message the message
+ * @param slot the slot to get data from
+ * @returns the data, or #NULL if not found
+ */
+void*
+dbus_message_get_data (DBusMessage *message,
+ dbus_int32_t slot)
+{
+ void *res;
+
+ _dbus_return_val_if_fail (message != NULL, NULL);
+
+ res = _dbus_data_slot_list_get (&slot_allocator,
+ &message->slot_list,
+ slot);
+
+ return res;
+}
+
+/**
+ * Utility function to convert a machine-readable (not translated)
+ * string into a D-Bus message type.
+ *
+ * @code
+ * "method_call" -> DBUS_MESSAGE_TYPE_METHOD_CALL
+ * "method_return" -> DBUS_MESSAGE_TYPE_METHOD_RETURN
+ * "signal" -> DBUS_MESSAGE_TYPE_SIGNAL
+ * "error" -> DBUS_MESSAGE_TYPE_ERROR
+ * anything else -> DBUS_MESSAGE_TYPE_INVALID
+ * @endcode
+ *
+ */
+int
+dbus_message_type_from_string (const char *type_str)
+{
+ if (strcmp (type_str, "method_call") == 0)
+ return DBUS_MESSAGE_TYPE_METHOD_CALL;
+ if (strcmp (type_str, "method_return") == 0)
+ return DBUS_MESSAGE_TYPE_METHOD_RETURN;
+ else if (strcmp (type_str, "signal") == 0)
+ return DBUS_MESSAGE_TYPE_SIGNAL;
+ else if (strcmp (type_str, "error") == 0)
+ return DBUS_MESSAGE_TYPE_ERROR;
+ else
+ return DBUS_MESSAGE_TYPE_INVALID;
+}
+
+/**
+ * Utility function to convert a D-Bus message type into a
+ * machine-readable string (not translated).
+ *
+ * @code
+ * DBUS_MESSAGE_TYPE_METHOD_CALL -> "method_call"
+ * DBUS_MESSAGE_TYPE_METHOD_RETURN -> "method_return"
+ * DBUS_MESSAGE_TYPE_SIGNAL -> "signal"
+ * DBUS_MESSAGE_TYPE_ERROR -> "error"
+ * DBUS_MESSAGE_TYPE_INVALID -> "invalid"
+ * @endcode
+ *
+ */
+const char *
+dbus_message_type_to_string (int type)
+{
+ switch (type)
+ {
+ case DBUS_MESSAGE_TYPE_METHOD_CALL:
+ return "method_call";
+ case DBUS_MESSAGE_TYPE_METHOD_RETURN:
+ return "method_return";
+ case DBUS_MESSAGE_TYPE_SIGNAL:
+ return "signal";
+ case DBUS_MESSAGE_TYPE_ERROR:
+ return "error";
+ default:
+ return "invalid";
+ }
+}
+
+/**
+ * Turn a DBusMessage into the marshalled form as described in the D-Bus
+ * specification.
+ *
+ * Generally, this function is only useful for encapsulating D-Bus messages in
+ * a different protocol.
+ *
+ * @param msg the DBusMessage
+ * @param marshalled_data_p the location to save the marshalled form to
+ * @param len_p the location to save the length of the marshalled form to
+ * @returns #FALSE if there was not enough memory
+ */
+dbus_bool_t
+dbus_message_marshal (DBusMessage *msg,
+ char **marshalled_data_p,
+ int *len_p)
+{
+ DBusString tmp;
+
+ _dbus_return_val_if_fail (msg != NULL, FALSE);
+ _dbus_return_val_if_fail (marshalled_data_p != NULL, FALSE);
+ _dbus_return_val_if_fail (len_p != NULL, FALSE);
+
+ if (!_dbus_string_init (&tmp))
+ return FALSE;
+
+ if (!_dbus_string_copy (&(msg->header.data), 0, &tmp, 0))
+ goto fail;
+
+ *len_p = _dbus_string_get_length (&tmp);
+
+ if (!_dbus_string_copy (&(msg->body), 0, &tmp, *len_p))
+ goto fail;
+
+ *len_p = _dbus_string_get_length (&tmp);
+
+ if (!_dbus_string_steal_data (&tmp, marshalled_data_p))
+ goto fail;
+
+ _dbus_string_free (&tmp);
+ return TRUE;
+
+ fail:
+ _dbus_string_free (&tmp);
+ return FALSE;
+}
+
+/**
+ * Demarshal a D-Bus message from the format described in the D-Bus
+ * specification.
+ *
+ * Generally, this function is only useful for encapsulating D-Bus messages in
+ * a different protocol.
+ *
+ * @param str the marshalled DBusMessage
+ * @param len the length of str
+ * @param error the location to save errors to
+ * @returns #NULL if there was an error
+ */
+DBusMessage *
+dbus_message_demarshal (const char *str,
+ int len,
+ DBusError *error)
+{
+ DBusMessageLoader *loader;
+ DBusString *buffer;
+ DBusMessage *msg;
+
+ _dbus_return_val_if_fail (str != NULL, NULL);
+
+ loader = _dbus_message_loader_new ();
+
+ if (loader == NULL)
+ return NULL;
+
+ _dbus_message_loader_get_buffer (loader, &buffer);
+ _dbus_string_append_len (buffer, str, len);
+ _dbus_message_loader_return_buffer (loader, buffer, len);
+
+ if (!_dbus_message_loader_queue_messages (loader))
+ goto fail_oom;
+
+ if (_dbus_message_loader_get_is_corrupted (loader))
+ goto fail_corrupt;
+
+ msg = _dbus_message_loader_pop_message (loader);
+
+ if (!msg)
+ goto fail_oom;
+
+ _dbus_message_loader_unref (loader);
+ return msg;
+
+ fail_corrupt:
+ dbus_set_error (error, DBUS_ERROR_INVALID_ARGS, "Message is corrupted");
+ _dbus_message_loader_unref (loader);
+ return NULL;
+
+ fail_oom:
+ _DBUS_SET_OOM (error);
+ _dbus_message_loader_unref (loader);
+ return NULL;
+}
+
+/**
+ * Returns the number of bytes required to be in the buffer to demarshal a
+ * D-Bus message.
+ *
+ * Generally, this function is only useful for encapsulating D-Bus messages in
+ * a different protocol.
+ *
+ * @param str data to be marshalled
+ * @param len the length of str
+ * @param error the location to save errors to
+ * @returns -1 if there was no valid data to be demarshalled, 0 if there wasn't enough data to determine how much should be demarshalled. Otherwise returns the number of bytes to be demarshalled
+ *
+ */
+int
+dbus_message_demarshal_bytes_needed(const char *buf,
+ int len)
+{
+ DBusString str;
+ int byte_order, fields_array_len, header_len, body_len;
+ DBusValidity validity = DBUS_VALID;
+ int have_message;
+
+ if (!buf || len < DBUS_MINIMUM_HEADER_SIZE)
+ return 0;
+
+ if (len > DBUS_MAXIMUM_MESSAGE_LENGTH)
+ len = DBUS_MAXIMUM_MESSAGE_LENGTH;
+ _dbus_string_init_const_len (&str, buf, len);
+
+ validity = DBUS_VALID;
+ have_message
+ = _dbus_header_have_message_untrusted(DBUS_MAXIMUM_MESSAGE_LENGTH,
+ &validity, &byte_order,
+ &fields_array_len,
+ &header_len,
+ &body_len,
+ &str, 0,
+ len);
+ _dbus_string_free (&str);
+
+ if (validity == DBUS_VALID)
+ {
+ _dbus_assert(have_message);
+ return header_len + body_len;
+ }
+ else
+ {
+ return -1; /* broken! */
+ }
+}
+
+/** @} */
+
+/* tests in dbus-message-util.c */
projects / monky / blobdiff