Make QtDBus compile without libdbus-1 headers, if dlopening

Most of QtDBus already needs very little from libdus-1, so create an
extra header containing the minimum API we actually need.

One large advantage of this solution is that now QtDBus can always be
enabled, even if the system doesn't have libdbus-1 installed. This is
interesting on OS X, where libdbus-1 is often installed by Homebrew or
MacPorts, which may include extra libraries we don't want in our
packaging.

Change-Id: I1b397121ec12eeca333ef778cf8e1c7b64d6b223
Reviewed-by: Lars Knoll <lars.knoll@digia.com>

1 files changed, 275 insertions, 0 deletions

diff --git a/src/dbus/dbus_minimal_p.h b/src/dbus/dbus_minimal_p.h
new file mode 100644
index 0000000000..862e8201a1
--- /dev/null
+++ b/src/dbus/dbus_minimal_p.h
@@ -0,0 +1,275 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Intel Corporation
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the QtDBus module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia. For licensing terms and
+** conditions see http://qt.digia.com/licensing. For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights. These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef DBUS_MINIMAL_P_H
+#define DBUS_MINIMAL_P_H
+
+extern "C" {
+
+// Equivalent to dbus-arch-deps.h
+typedef qint64 dbus_int64_t;
+typedef quint64 dbus_uint64_t;
+typedef qint32 dbus_int32_t;
+typedef quint32 dbus_uint32_t;
+typedef qint16 dbus_int16_t;
+typedef quint16 dbus_uint16_t;
+
+// simulate minimum version we support
+#define DBUS_MAJOR_VERSION 1
+#define DBUS_MINOR_VERSION 2
+#define DBUS_VERSION ((1 << 16) | (2 << 8))
+
+// forward declaration to opaque types we use
+struct DBusConnection;
+struct DBusMessage;
+struct DBusPendingCall;
+struct DBusServer;
+struct DBusTimeout;
+struct DBusWatch;
+
+// This file contains constants and typedefs from libdbus-1 headers,
+// which carry the following copyright:
+/*
+ * Copyright (C) 2002, 2003  CodeFactory AB
+ * Copyright (C) 2004, 2005 Red Hat, Inc.
+ *
+ * Licensed under the Academic Free License version 2.1
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+/* dbus-types.h */
+typedef dbus_uint32_t  dbus_unichar_t;
+typedef dbus_uint32_t  dbus_bool_t;
+
+/* dbus-shared.h */
+#define DBUS_SERVICE_DBUS      "org.freedesktop.DBus"
+#define DBUS_PATH_DBUS  "/org/freedesktop/DBus"
+#define DBUS_INTERFACE_DBUS           "org.freedesktop.DBus"
+#define DBUS_INTERFACE_INTROSPECTABLE "org.freedesktop.DBus.Introspectable"
+#define DBUS_INTERFACE_PROPERTIES     "org.freedesktop.DBus.Properties"
+
+#define DBUS_NAME_FLAG_ALLOW_REPLACEMENT 0x1 /**< Allow another service to become the primary owner if requested */
+#define DBUS_NAME_FLAG_REPLACE_EXISTING  0x2 /**< Request to replace the current primary owner */
+#define DBUS_NAME_FLAG_DO_NOT_QUEUE      0x4 /**< If we can not become the primary owner do not place us in the queue */
+
+#define DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER  1 /**< Service has become the primary owner of the requested name */
+#define DBUS_REQUEST_NAME_REPLY_IN_QUEUE       2 /**< Service could not become the primary owner and has been placed in the queue */
+#define DBUS_REQUEST_NAME_REPLY_EXISTS         3 /**< Service is already in the queue */
+#define DBUS_REQUEST_NAME_REPLY_ALREADY_OWNER  4 /**< Service is already the primary owner */
+
+#define DBUS_RELEASE_NAME_REPLY_RELEASED        1 /**< Service was released from the given name */
+#define DBUS_RELEASE_NAME_REPLY_NON_EXISTENT    2 /**< The given name does not exist on the bus */
+#define DBUS_RELEASE_NAME_REPLY_NOT_OWNER       3 /**< Service is not an owner of the given name */
+
+typedef enum
+{
+  DBUS_BUS_SESSION,    /**< The login session bus */
+  DBUS_BUS_SYSTEM,     /**< The systemwide bus */
+  DBUS_BUS_STARTER     /**< The bus that started us, if any */
+} DBusBusType;
+
+typedef enum
+{
+  DBUS_HANDLER_RESULT_HANDLED,         /**< Message has had its effect - no need to run more handlers. */
+  DBUS_HANDLER_RESULT_NOT_YET_HANDLED, /**< Message has not had any effect - see if other handlers want it. */
+  DBUS_HANDLER_RESULT_NEED_MEMORY      /**< Need more memory in order to return #DBUS_HANDLER_RESULT_HANDLED or #DBUS_HANDLER_RESULT_NOT_YET_HANDLED. Please try again later with more memory. */
+} DBusHandlerResult;
+
+/* dbus-memory.h */
+typedef void (* DBusFreeFunction) (void *memory);
+
+/* dbus-connection.h */
+typedef enum
+{
+  DBUS_WATCH_READABLE = 1 << 0, /**< As in POLLIN */
+  DBUS_WATCH_WRITABLE = 1 << 1, /**< As in POLLOUT */
+  DBUS_WATCH_ERROR    = 1 << 2, /**< As in POLLERR (can't watch for
+                                 *   this, but can be present in
+                                 *   current state passed to
+                                 *   dbus_watch_handle()).
+                                 */
+  DBUS_WATCH_HANGUP   = 1 << 3  /**< As in POLLHUP (can't watch for
+                                 *   it, but can be present in current
+                                 *   state passed to
+                                 *   dbus_watch_handle()).
+                                 */
+  /* Internal to libdbus, there is also _DBUS_WATCH_NVAL in dbus-watch.h */
+} DBusWatchFlags;
+
+typedef enum
+{
+  DBUS_DISPATCH_DATA_REMAINS,  /**< There is more data to potentially convert to messages. */
+  DBUS_DISPATCH_COMPLETE,      /**< All currently available data has been processed. */
+  DBUS_DISPATCH_NEED_MEMORY    /**< More memory is needed to continue. */
+} DBusDispatchStatus;
+
+typedef dbus_bool_t (* DBusAddWatchFunction)       (DBusWatch      *watch,
+                                                    void           *data);
+typedef void        (* DBusWatchToggledFunction)   (DBusWatch      *watch,
+                                                    void           *data);
+typedef void        (* DBusRemoveWatchFunction)    (DBusWatch      *watch,
+                                                    void           *data);
+typedef dbus_bool_t (* DBusAddTimeoutFunction)     (DBusTimeout    *timeout,
+                                                    void           *data);
+typedef void        (* DBusTimeoutToggledFunction) (DBusTimeout    *timeout,
+                                                    void           *data);
+typedef void        (* DBusRemoveTimeoutFunction)  (DBusTimeout    *timeout,
+                                                    void           *data);
+typedef void        (* DBusDispatchStatusFunction) (DBusConnection *connection,
+                                                    DBusDispatchStatus new_status,
+                                                    void           *data);
+typedef void        (* DBusWakeupMainFunction)     (void           *data);
+typedef void (* DBusPendingCallNotifyFunction) (DBusPendingCall *pending,
+                                                void            *user_data);
+typedef DBusHandlerResult (* DBusHandleMessageFunction) (DBusConnection     *connection,
+                                                         DBusMessage        *message,
+                                                         void               *user_data);
+
+/* dbus-errors.h */
+struct DBusError
+{
+  const char *name;    /**< public error name field */
+  const char *message; /**< public error message field */
+
+  unsigned int dummy1 : 1; /**< placeholder */
+  unsigned int dummy2 : 1; /**< placeholder */
+  unsigned int dummy3 : 1; /**< placeholder */
+  unsigned int dummy4 : 1; /**< placeholder */
+  unsigned int dummy5 : 1; /**< placeholder */
+
+  void *padding1; /**< placeholder */
+};
+
+/* dbus-message.h */
+struct DBusMessageIter
+{
+  void *dummy1;         /**< Don't use this */
+  void *dummy2;         /**< Don't use this */
+  dbus_uint32_t dummy3; /**< Don't use this */
+  int dummy4;           /**< Don't use this */
+  int dummy5;           /**< Don't use this */
+  int dummy6;           /**< Don't use this */
+  int dummy7;           /**< Don't use this */
+  int dummy8;           /**< Don't use this */
+  int dummy9;           /**< Don't use this */
+  int dummy10;          /**< Don't use this */
+  int dummy11;          /**< Don't use this */
+  int pad1;             /**< Don't use this */
+  int pad2;             /**< Don't use this */
+  void *pad3;           /**< Don't use this */
+};
+
+/* dbus-protocol.h */
+#define DBUS_TYPE_INVALID       ((int) '\0')
+#define DBUS_TYPE_INVALID_AS_STRING        "\0"
+#define DBUS_TYPE_BYTE          ((int) 'y')
+#define DBUS_TYPE_BYTE_AS_STRING           "y"
+#define DBUS_TYPE_BOOLEAN       ((int) 'b')
+#define DBUS_TYPE_BOOLEAN_AS_STRING        "b"
+#define DBUS_TYPE_INT16         ((int) 'n')
+#define DBUS_TYPE_INT16_AS_STRING          "n"
+#define DBUS_TYPE_UINT16        ((int) 'q')
+#define DBUS_TYPE_UINT16_AS_STRING         "q"
+#define DBUS_TYPE_INT32         ((int) 'i')
+#define DBUS_TYPE_INT32_AS_STRING          "i"
+#define DBUS_TYPE_UINT32        ((int) 'u')
+#define DBUS_TYPE_UINT32_AS_STRING         "u"
+#define DBUS_TYPE_INT64         ((int) 'x')
+#define DBUS_TYPE_INT64_AS_STRING          "x"
+#define DBUS_TYPE_UINT64        ((int) 't')
+#define DBUS_TYPE_UINT64_AS_STRING         "t"
+#define DBUS_TYPE_DOUBLE        ((int) 'd')
+#define DBUS_TYPE_DOUBLE_AS_STRING         "d"
+#define DBUS_TYPE_STRING        ((int) 's')
+#define DBUS_TYPE_STRING_AS_STRING         "s"
+#define DBUS_TYPE_OBJECT_PATH   ((int) 'o')
+#define DBUS_TYPE_OBJECT_PATH_AS_STRING    "o"
+#define DBUS_TYPE_SIGNATURE     ((int) 'g')
+#define DBUS_TYPE_SIGNATURE_AS_STRING      "g"
+#define DBUS_TYPE_UNIX_FD      ((int) 'h')
+#define DBUS_TYPE_UNIX_FD_AS_STRING        "h"
+#define DBUS_TYPE_ARRAY         ((int) 'a')
+#define DBUS_TYPE_ARRAY_AS_STRING          "a"
+#define DBUS_TYPE_VARIANT       ((int) 'v')
+#define DBUS_TYPE_VARIANT_AS_STRING        "v"
+
+#define DBUS_TYPE_STRUCT        ((int) 'r')
+#define DBUS_TYPE_STRUCT_AS_STRING         "r"
+#define DBUS_TYPE_DICT_ENTRY    ((int) 'e')
+#define DBUS_TYPE_DICT_ENTRY_AS_STRING     "e"
+
+#define DBUS_STRUCT_BEGIN_CHAR   ((int) '(')
+#define DBUS_STRUCT_BEGIN_CHAR_AS_STRING   "("
+#define DBUS_STRUCT_END_CHAR     ((int) ')')
+#define DBUS_STRUCT_END_CHAR_AS_STRING     ")"
+#define DBUS_DICT_ENTRY_BEGIN_CHAR   ((int) '{')
+#define DBUS_DICT_ENTRY_BEGIN_CHAR_AS_STRING   "{"
+#define DBUS_DICT_ENTRY_END_CHAR     ((int) '}')
+#define DBUS_DICT_ENTRY_END_CHAR_AS_STRING     "}"
+
+#define DBUS_MESSAGE_TYPE_INVALID       0
+#define DBUS_MESSAGE_TYPE_METHOD_CALL   1
+#define DBUS_MESSAGE_TYPE_METHOD_RETURN 2
+#define DBUS_MESSAGE_TYPE_ERROR         3
+#define DBUS_MESSAGE_TYPE_SIGNAL        4
+
+#define DBUS_MAXIMUM_NAME_LENGTH 255
+
+#define DBUS_INTROSPECT_1_0_XML_NAMESPACE         "http://www.freedesktop.org/standards/dbus"
+#define DBUS_INTROSPECT_1_0_XML_PUBLIC_IDENTIFIER "-//freedesktop//DTD D-BUS Object Introspection 1.0//EN"
+#define DBUS_INTROSPECT_1_0_XML_SYSTEM_IDENTIFIER "http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd"
+#define DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE "<!DOCTYPE node PUBLIC \"" DBUS_INTROSPECT_1_0_XML_PUBLIC_IDENTIFIER "\"\n\"" DBUS_INTROSPECT_1_0_XML_SYSTEM_IDENTIFIER "\">\n"
+
+/* dbus-server.h */
+typedef void (* DBusNewConnectionFunction) (DBusServer     *server,
+                                            DBusConnection *new_connection,
+                                            void           *data);
+
+} // extern "C"
+
+#endif // DBUS_MINIMAL_P_H
+