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diff --git a/src/3rdparty/libdbus/dbus/dbus-string-private.h b/src/3rdparty/libdbus/dbus/dbus-string-private.h
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+++ b/src/3rdparty/libdbus/dbus/dbus-string-private.h
@@ -0,0 +1,135 @@
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
+/* dbus-string-private.h String utility class (internal to D-Bus implementation)
+ *
+ * Copyright (C) 2002, 2003  Red Hat, Inc.
+ *
+ * SPDX-License-Identifier: AFL-2.1 OR GPL-2.0-or-later
+ *
+ * Licensed under the Academic Free License version 2.1
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#ifndef DBUS_STRING_PRIVATE_H
+#define DBUS_STRING_PRIVATE_H
+
+#include <dbus/dbus-internals.h>
+#include <dbus/dbus-memory.h>
+#include <dbus/dbus-types.h>
+
+#ifndef DBUS_CAN_USE_DBUS_STRING_PRIVATE
+#error "Don't go including dbus-string-private.h for no good reason"
+#endif
+
+DBUS_BEGIN_DECLS
+
+/**
+ * @brief Internals of DBusString.
+ * 
+ * DBusString internals. DBusString is an opaque objects, it must be
+ * used via accessor functions.
+ */
+typedef struct
+{
+  unsigned char *str;            /**< String data, plus nul termination */
+  int            len;            /**< Length without nul */
+  int            allocated;      /**< Allocated size of data */
+  unsigned int   constant : 1;   /**< String data is not owned by DBusString */
+  unsigned int   locked : 1;     /**< DBusString has been locked and can't be changed */
+  unsigned int   valid : 1;      /**< DBusString is valid (initialized and not freed) */
+  unsigned int   align_offset : 3; /**< str - align_offset is the actual malloc block */
+} DBusRealString;
+
+_DBUS_STATIC_ASSERT (sizeof (DBusRealString) == sizeof (DBusString));
+
+/**
+ * @defgroup DBusStringInternals DBusString implementation details
+ * @ingroup  DBusInternals
+ * @brief DBusString implementation details
+ *
+ * The guts of DBusString.
+ *
+ * @{
+ */
+
+/**
+ * The maximum length of a DBusString
+ */
+#define _DBUS_STRING_MAX_LENGTH (_DBUS_INT32_MAX - _DBUS_STRING_ALLOCATION_PADDING)
+
+/**
+ * Checks a bunch of assertions about a string object
+ *
+ * @param real the DBusRealString
+ */
+#define DBUS_GENERIC_STRING_PREAMBLE(real) \
+  do { \
+      (void) real; /* might be unused unless asserting */ \
+      _dbus_assert ((real) != NULL); \
+      _dbus_assert ((real)->valid); \
+      _dbus_assert ((real)->len >= 0); \
+      _dbus_assert ((real)->allocated >= 0); \
+      _dbus_assert ((real)->len <= ((real)->allocated - _DBUS_STRING_ALLOCATION_PADDING)); \
+      _dbus_assert ((real)->len <= _DBUS_STRING_MAX_LENGTH); \
+  } while (0)
+
+/**
+ * Checks assertions about a string object that needs to be
+ * modifiable - may not be locked or const. Also declares
+ * the "real" variable pointing to DBusRealString. 
+ * @param str the string
+ */
+#define DBUS_STRING_PREAMBLE(str) DBusRealString *real = (DBusRealString*) str; \
+  DBUS_GENERIC_STRING_PREAMBLE (real);                                          \
+  _dbus_assert (!(real)->constant);                                             \
+  _dbus_assert (!(real)->locked)
+
+/**
+ * Checks assertions about a string object that may be locked but
+ * can't be const. i.e. a string object that we can free.  Also
+ * declares the "real" variable pointing to DBusRealString.
+ *
+ * @param str the string
+ */
+#define DBUS_LOCKED_STRING_PREAMBLE(str) DBusRealString *real = (DBusRealString*) str; \
+  DBUS_GENERIC_STRING_PREAMBLE (real);                                                 \
+  _dbus_assert (!(real)->constant)
+
+/**
+ * Checks assertions about a string that may be const or locked.  Also
+ * declares the "real" variable pointing to DBusRealString.
+ * @param str the string.
+ */
+#define DBUS_CONST_STRING_PREAMBLE(str) const DBusRealString *real = (DBusRealString*) str; \
+  DBUS_GENERIC_STRING_PREAMBLE (real)
+
+/**
+ * Checks for ASCII blank byte
+ * @param c the byte
+ */
+#define DBUS_IS_ASCII_BLANK(c) ((c) == ' ' || (c) == '\t')
+
+/**
+ * Checks for ASCII whitespace byte
+ * @param c the byte
+ */
+#define DBUS_IS_ASCII_WHITE(c) ((c) == ' ' || (c) == '\t' || (c) == '\n' || (c) == '\r')
+
+/** @} */
+
+DBUS_END_DECLS
+
+#endif /* DBUS_STRING_PRIVATE_H */