gio/gdbusintrospection.c

   1 /* GDBus - GLib D-Bus Library
   2  *
   3  * Copyright (C) 2008-2010 Red Hat, Inc.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General
  16  * Public License along with this library; if not, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  *
  20  * Author: David Zeuthen <davidz@redhat.com>
  21  */
  22
  23 #include "config.h"
  24
  25 #include <stdlib.h>
  26 #include <string.h>
  27
  28 #include "gdbusintrospection.h"
  29
  30 #include "glibintl.h"
  31
  32 /**
  33  * SECTION:gdbusintrospection
  34  * @title: D-Bus Introspection Data
  35  * @short_description: Node and interface description data structures
  36  * @include: gio/gio.h
  37  *
  38  * Various data structures and convenience routines to parse and
  39  * generate D-Bus introspection XML. Introspection information is
  40  * used when registering objects with g_dbus_connection_register_object().
  41  *
  42  * The format of D-Bus introspection XML is specified in the
  43  * <ulink url="http://dbus.freedesktop.org/doc/dbus-specification.html#introspection-format">D-Bus specification</ulink>.
  44  */
  45
  46 /* ---------------------------------------------------------------------------------------------------- */
  47
  48 #define _MY_DEFINE_BOXED_TYPE(TypeName, type_name) \
  49   G_DEFINE_BOXED_TYPE (TypeName, type_name, type_name##_ref, type_name##_unref)
  50
  51 _MY_DEFINE_BOXED_TYPE (GDBusNodeInfo,       g_dbus_node_info);
  52 _MY_DEFINE_BOXED_TYPE (GDBusInterfaceInfo,  g_dbus_interface_info);
  53 _MY_DEFINE_BOXED_TYPE (GDBusMethodInfo,     g_dbus_method_info);
  54 _MY_DEFINE_BOXED_TYPE (GDBusSignalInfo,     g_dbus_signal_info);
  55 _MY_DEFINE_BOXED_TYPE (GDBusPropertyInfo,   g_dbus_property_info);
  56 _MY_DEFINE_BOXED_TYPE (GDBusArgInfo,        g_dbus_arg_info);
  57 _MY_DEFINE_BOXED_TYPE (GDBusAnnotationInfo, g_dbus_annotation_info);
  58
  59 /* ---------------------------------------------------------------------------------------------------- */
  60
  61 typedef struct
  62 {
  63   /* stuff we are currently collecting */
  64   GPtrArray *args;
  65   GPtrArray *out_args;
  66   GPtrArray *methods;
  67   GPtrArray *signals;
  68   GPtrArray *properties;
  69   GPtrArray *interfaces;
  70   GPtrArray *nodes;
  71   GPtrArray *annotations;
  72
  73   /* A list of GPtrArray's containing annotations */
  74   GSList *annotations_stack;
  75
  76   /* A list of GPtrArray's containing interfaces */
  77   GSList *interfaces_stack;
  78
  79   /* A list of GPtrArray's containing nodes */
  80   GSList *nodes_stack;
  81
  82   /* Whether the direction was "in" for last parsed arg */
  83   gboolean last_arg_was_in;
  84
  85   /* Number of args currently being collected; used for assigning
  86    * names to args without a "name" attribute
  87    */
  88   guint num_args;
  89
  90 } ParseData;
  91
  92 /* ---------------------------------------------------------------------------------------------------- */
  93
  94 /**
  95  * g_dbus_node_info_ref:
  96  * @info: A #GDBusNodeInfo
  97  *
  98  * If @info is statically allocated does nothing. Otherwise increases
  99  * the reference count.
 100  *
 101  * Returns: The same @info.
 102  *
 103  * Since: 2.26
 104  */
 105 GDBusNodeInfo *
 106 g_dbus_node_info_ref (GDBusNodeInfo *info)
 107 {
 108   if (info->ref_count == -1)
 109     return info;
 110   g_atomic_int_inc (&info->ref_count);
 111   return info;
 112 }
 113
 114 /**
 115  * g_dbus_interface_info_ref:
 116  * @info: A #GDBusInterfaceInfo
 117  *
 118  * If @info is statically allocated does nothing. Otherwise increases
 119  * the reference count.
 120  *
 121  * Returns: The same @info.
 122  *
 123  * Since: 2.26
 124  */
 125 GDBusInterfaceInfo *
 126 g_dbus_interface_info_ref (GDBusInterfaceInfo *info)
 127 {
 128   if (info->ref_count == -1)
 129     return info;
 130   g_atomic_int_inc (&info->ref_count);
 131   return info;
 132 }
 133
 134 /**
 135  * g_dbus_method_info_ref:
 136  * @info: A #GDBusMethodInfo
 137  *
 138  * If @info is statically allocated does nothing. Otherwise increases
 139  * the reference count.
 140  *
 141  * Returns: The same @info.
 142  *
 143  * Since: 2.26
 144  */
 145 GDBusMethodInfo *
 146 g_dbus_method_info_ref (GDBusMethodInfo *info)
 147 {
 148   if (info->ref_count == -1)
 149     return info;
 150   g_atomic_int_inc (&info->ref_count);
 151   return info;
 152 }
 153
 154 /**
 155  * g_dbus_signal_info_ref:
 156  * @info: A #GDBusSignalInfo
 157  *
 158  * If @info is statically allocated does nothing. Otherwise increases
 159  * the reference count.
 160  *
 161  * Returns: The same @info.
 162  *
 163  * Since: 2.26
 164  */
 165 GDBusSignalInfo *
 166 g_dbus_signal_info_ref (GDBusSignalInfo *info)
 167 {
 168   if (info->ref_count == -1)
 169     return info;
 170   g_atomic_int_inc (&info->ref_count);
 171   return info;
 172 }
 173
 174 /**
 175  * g_dbus_property_info_ref:
 176  * @info: A #GDBusPropertyInfo
 177  *
 178  * If @info is statically allocated does nothing. Otherwise increases
 179  * the reference count.
 180  *
 181  * Returns: The same @info.
 182  *
 183  * Since: 2.26
 184  */
 185 GDBusPropertyInfo *
 186 g_dbus_property_info_ref (GDBusPropertyInfo *info)
 187 {
 188   if (info->ref_count == -1)
 189     return info;
 190   g_atomic_int_inc (&info->ref_count);
 191   return info;
 192 }
 193
 194 /**
 195  * g_dbus_arg_info_ref:
 196  * @info: A #GDBusArgInfo
 197  *
 198  * If @info is statically allocated does nothing. Otherwise increases
 199  * the reference count.
 200  *
 201  * Returns: The same @info.
 202  *
 203  * Since: 2.26
 204  */
 205 GDBusArgInfo *
 206 g_dbus_arg_info_ref (GDBusArgInfo *info)
 207 {
 208   if (info->ref_count == -1)
 209     return info;
 210   g_atomic_int_inc (&info->ref_count);
 211   return info;
 212 }
 213
 214 /**
 215  * g_dbus_annotation_info_ref:
 216  * @info: A #GDBusNodeInfo
 217  *
 218  * If @info is statically allocated does nothing. Otherwise increases
 219  * the reference count.
 220  *
 221  * Returns: The same @info.
 222  *
 223  * Since: 2.26
 224  */
 225 GDBusAnnotationInfo *
 226 g_dbus_annotation_info_ref (GDBusAnnotationInfo *info)
 227 {
 228   if (info->ref_count == -1)
 229     return info;
 230   g_atomic_int_inc (&info->ref_count);
 231   return info;
 232 }
 233
 234 /* ---------------------------------------------------------------------------------------------------- */
 235
 236 static void
 237 free_null_terminated_array (gpointer array, GDestroyNotify unref_func)
 238 {
 239   guint n;
 240   gpointer *p = array;
 241   if (p == NULL)
 242     return;
 243   for (n = 0; p[n] != NULL; n++)
 244     unref_func (p[n]);
 245   g_free (p);
 246 }
 247
 248 /**
 249  * g_dbus_annotation_info_unref:
 250  * @info: A #GDBusAnnotationInfo.
 251  *
 252  * If @info is statically allocated, does nothing. Otherwise decreases
 253  * the reference count of @info. When its reference count drops to 0,
 254  * the memory used is freed.
 255  *
 256  * Since: 2.26
 257  */
 258 void
 259 g_dbus_annotation_info_unref (GDBusAnnotationInfo *info)
 260 {
 261   if (info->ref_count == -1)
 262     return;
 263   if (g_atomic_int_dec_and_test (&info->ref_count))
 264     {
 265       g_free (info->key);
 266       g_free (info->value);
 267       free_null_terminated_array (info->annotations, (GDestroyNotify) g_dbus_annotation_info_unref);
 268       g_free (info);
 269     }
 270 }
 271
 272 /**
 273  * g_dbus_arg_info_unref:
 274  * @info: A #GDBusArgInfo.
 275  *
 276  * If @info is statically allocated, does nothing. Otherwise decreases
 277  * the reference count of @info. When its reference count drops to 0,
 278  * the memory used is freed.
 279  *
 280  * Since: 2.26
 281  */
 282 void
 283 g_dbus_arg_info_unref (GDBusArgInfo *info)
 284 {
 285   if (info->ref_count == -1)
 286     return;
 287   if (g_atomic_int_dec_and_test (&info->ref_count))
 288     {
 289       g_free (info->name);
 290       g_free (info->signature);
 291       free_null_terminated_array (info->annotations, (GDestroyNotify) g_dbus_annotation_info_unref);
 292       g_free (info);
 293     }
 294 }
 295
 296 /**
 297  * g_dbus_method_info_unref:
 298  * @info: A #GDBusMethodInfo.
 299  *
 300  * If @info is statically allocated, does nothing. Otherwise decreases
 301  * the reference count of @info. When its reference count drops to 0,
 302  * the memory used is freed.
 303  *
 304  * Since: 2.26
 305  */
 306 void
 307 g_dbus_method_info_unref (GDBusMethodInfo *info)
 308 {
 309   if (info->ref_count == -1)
 310     return;
 311   if (g_atomic_int_dec_and_test (&info->ref_count))
 312     {
 313       g_free (info->name);
 314       free_null_terminated_array (info->in_args, (GDestroyNotify) g_dbus_arg_info_unref);
 315       free_null_terminated_array (info->out_args, (GDestroyNotify) g_dbus_arg_info_unref);
 316       free_null_terminated_array (info->annotations, (GDestroyNotify) g_dbus_annotation_info_unref);
 317       g_free (info);
 318     }
 319 }
 320
 321 /**
 322  * g_dbus_signal_info_unref:
 323  * @info: A #GDBusSignalInfo.
 324  *
 325  * If @info is statically allocated, does nothing. Otherwise decreases
 326  * the reference count of @info. When its reference count drops to 0,
 327  * the memory used is freed.
 328  *
 329  * Since: 2.26
 330  */
 331 void
 332 g_dbus_signal_info_unref (GDBusSignalInfo *info)
 333 {
 334   if (info->ref_count == -1)
 335     return;
 336   if (g_atomic_int_dec_and_test (&info->ref_count))
 337     {
 338       g_free (info->name);
 339       free_null_terminated_array (info->args, (GDestroyNotify) g_dbus_arg_info_unref);
 340       free_null_terminated_array (info->annotations, (GDestroyNotify) g_dbus_annotation_info_unref);
 341       g_free (info);
 342     }
 343 }
 344
 345 /**
 346  * g_dbus_property_info_unref:
 347  * @info: A #GDBusPropertyInfo.
 348  *
 349  * If @info is statically allocated, does nothing. Otherwise decreases
 350  * the reference count of @info. When its reference count drops to 0,
 351  * the memory used is freed.
 352  *
 353  * Since: 2.26
 354  */
 355 void
 356 g_dbus_property_info_unref (GDBusPropertyInfo *info)
 357 {
 358   if (info->ref_count == -1)
 359     return;
 360   if (g_atomic_int_dec_and_test (&info->ref_count))
 361     {
 362       g_free (info->name);
 363       g_free (info->signature);
 364       free_null_terminated_array (info->annotations, (GDestroyNotify) g_dbus_annotation_info_unref);
 365       g_free (info);
 366     }
 367 }
 368
 369 /**
 370  * g_dbus_interface_info_unref:
 371  * @info: A #GDBusInterfaceInfo.
 372  *
 373  * If @info is statically allocated, does nothing. Otherwise decreases
 374  * the reference count of @info. When its reference count drops to 0,
 375  * the memory used is freed.
 376  *
 377  * Since: 2.26
 378  */
 379 void
 380 g_dbus_interface_info_unref (GDBusInterfaceInfo *info)
 381 {
 382   if (info->ref_count == -1)
 383     return;
 384   if (g_atomic_int_dec_and_test (&info->ref_count))
 385     {
 386       g_free (info->name);
 387       free_null_terminated_array (info->methods, (GDestroyNotify) g_dbus_method_info_unref);
 388       free_null_terminated_array (info->signals, (GDestroyNotify) g_dbus_signal_info_unref);
 389       free_null_terminated_array (info->properties, (GDestroyNotify) g_dbus_property_info_unref);
 390       free_null_terminated_array (info->annotations, (GDestroyNotify) g_dbus_annotation_info_unref);
 391       g_free (info);
 392     }
 393 }
 394
 395 /**
 396  * g_dbus_node_info_unref:
 397  * @info: A #GDBusNodeInfo.
 398  *
 399  * If @info is statically allocated, does nothing. Otherwise decreases
 400  * the reference count of @info. When its reference count drops to 0,
 401  * the memory used is freed.
 402  *
 403  * Since: 2.26
 404  */
 405 void
 406 g_dbus_node_info_unref (GDBusNodeInfo *info)
 407 {
 408   if (info->ref_count == -1)
 409     return;
 410   if (g_atomic_int_dec_and_test (&info->ref_count))
 411     {
 412       g_free (info->path);
 413       free_null_terminated_array (info->interfaces, (GDestroyNotify) g_dbus_interface_info_unref);
 414       free_null_terminated_array (info->nodes, (GDestroyNotify) g_dbus_node_info_unref);
 415       free_null_terminated_array (info->annotations, (GDestroyNotify) g_dbus_annotation_info_unref);
 416       g_free (info);
 417     }
 418 }
 419
 420 /* ---------------------------------------------------------------------------------------------------- */
 421
 422 static void
 423 g_dbus_annotation_info_set (ParseData            *data,
 424                             GDBusAnnotationInfo  *info,
 425                             const gchar          *key,
 426                             const gchar          *value,
 427                             GDBusAnnotationInfo **embedded_annotations)
 428 {
 429   info->ref_count = 1;
 430
 431   if (key != NULL)
 432     info->key = g_strdup (key);
 433
 434   if (value != NULL)
 435     info->value = g_strdup (value);
 436
 437   if (embedded_annotations != NULL)
 438     info->annotations = embedded_annotations;
 439 }
 440
 441 static void
 442 g_dbus_arg_info_set (ParseData            *data,
 443                      GDBusArgInfo         *info,
 444                      const gchar          *name,
 445                      const gchar          *signature,
 446                      GDBusAnnotationInfo **annotations)
 447 {
 448   info->ref_count = 1;
 449
 450   /* name may be NULL - TODO: compute name? */
 451   if (name != NULL)
 452     info->name = g_strdup (name);
 453
 454   if (signature != NULL)
 455     info->signature = g_strdup (signature);
 456
 457   if (annotations != NULL)
 458     info->annotations = annotations;
 459 }
 460
 461 static void
 462 g_dbus_method_info_set (ParseData            *data,
 463                         GDBusMethodInfo      *info,
 464                         const gchar          *name,
 465                         GDBusArgInfo        **in_args,
 466                         GDBusArgInfo        **out_args,
 467                         GDBusAnnotationInfo **annotations)
 468 {
 469   info->ref_count = 1;
 470
 471   if (name != NULL)
 472     info->name = g_strdup (name);
 473
 474   if (in_args != NULL)
 475     info->in_args = in_args;
 476
 477   if (out_args != NULL)
 478     info->out_args = out_args;
 479
 480   if (annotations != NULL)
 481     info->annotations = annotations;
 482 }
 483
 484 static void
 485 g_dbus_signal_info_set (ParseData            *data,
 486                         GDBusSignalInfo      *info,
 487                         const gchar          *name,
 488                         GDBusArgInfo        **args,
 489                         GDBusAnnotationInfo **annotations)
 490 {
 491   info->ref_count = 1;
 492
 493   if (name != NULL)
 494     info->name = g_strdup (name);
 495
 496   if (args != NULL)
 497     info->args = args;
 498
 499   if (annotations != NULL)
 500     info->annotations = annotations;
 501 }
 502
 503 static void
 504 g_dbus_property_info_set (ParseData               *data,
 505                           GDBusPropertyInfo       *info,
 506                           const gchar             *name,
 507                           const gchar             *signature,
 508                           GDBusPropertyInfoFlags   flags,
 509                           GDBusAnnotationInfo    **annotations)
 510 {
 511   info->ref_count = 1;
 512
 513   if (name != NULL)
 514     info->name = g_strdup (name);
 515
 516   if (flags != G_DBUS_PROPERTY_INFO_FLAGS_NONE)
 517     info->flags = flags;
 518
 519   if (signature != NULL)
 520     info->signature = g_strdup (signature);
 521
 522   if (annotations != NULL)
 523     info->annotations = annotations;
 524 }
 525
 526 static void
 527 g_dbus_interface_info_set (ParseData            *data,
 528                            GDBusInterfaceInfo   *info,
 529                            const gchar          *name,
 530                            GDBusMethodInfo     **methods,
 531                            GDBusSignalInfo     **signals,
 532                            GDBusPropertyInfo   **properties,
 533                            GDBusAnnotationInfo **annotations)
 534 {
 535   info->ref_count = 1;
 536
 537   if (name != NULL)
 538     info->name = g_strdup (name);
 539
 540   if (methods != NULL)
 541     info->methods = methods;
 542
 543   if (signals != NULL)
 544     info->signals = signals;
 545
 546   if (properties != NULL)
 547     info->properties = properties;
 548
 549   if (annotations != NULL)
 550     info->annotations = annotations;
 551 }
 552
 553 static void
 554 g_dbus_node_info_set (ParseData            *data,
 555                       GDBusNodeInfo        *info,
 556                       const gchar          *path,
 557                       GDBusInterfaceInfo  **interfaces,
 558                       GDBusNodeInfo       **nodes,
 559                       GDBusAnnotationInfo **annotations)
 560 {
 561   info->ref_count = 1;
 562
 563   if (path != NULL)
 564     {
 565       info->path = g_strdup (path);
 566       /* TODO: relative / absolute path snafu */
 567     }
 568
 569   if (interfaces != NULL)
 570     info->interfaces = interfaces;
 571
 572   if (nodes != NULL)
 573     info->nodes = nodes;
 574
 575   if (annotations != NULL)
 576     info->annotations = annotations;
 577 }
 578
 579 /* ---------------------------------------------------------------------------------------------------- */
 580
 581 static void
 582 g_dbus_annotation_info_generate_xml (GDBusAnnotationInfo *info,
 583                                      guint                indent,
 584                                      GString             *string_builder)
 585 {
 586   guint n;
 587
 588   g_string_append_printf (string_builder, "%*s<annotation name=\"%s\" value=\"%s\"",
 589                           indent, "",
 590                           info->key,
 591                           info->value);
 592
 593   if (info->annotations == NULL)
 594     {
 595       g_string_append (string_builder, "/>\n");
 596     }
 597   else
 598     {
 599       g_string_append (string_builder, ">\n");
 600
 601       for (n = 0; info->annotations != NULL && info->annotations[n] != NULL; n++)
 602         g_dbus_annotation_info_generate_xml (info->annotations[n],
 603                                              indent + 2,
 604                                              string_builder);
 605
 606       g_string_append_printf (string_builder, "%*s</annotation>\n",
 607                               indent, "");
 608     }
 609
 610 }
 611
 612 static void
 613 g_dbus_arg_info_generate_xml (GDBusArgInfo *info,
 614                               guint         indent,
 615                               const gchar  *extra_attributes,
 616                               GString      *string_builder)
 617 {
 618   guint n;
 619
 620   g_string_append_printf (string_builder, "%*s<arg type=\"%s\"",
 621                           indent, "",
 622                           info->signature);
 623
 624   if (info->name != NULL)
 625     g_string_append_printf (string_builder, " name=\"%s\"", info->name);
 626
 627   if (extra_attributes != NULL)
 628     g_string_append_printf (string_builder, " %s", extra_attributes);
 629
 630   if (info->annotations == NULL)
 631     {
 632       g_string_append (string_builder, "/>\n");
 633     }
 634   else
 635     {
 636       g_string_append (string_builder, ">\n");
 637
 638       for (n = 0; info->annotations != NULL && info->annotations[n] != NULL; n++)
 639         g_dbus_annotation_info_generate_xml (info->annotations[n],
 640                                              indent + 2,
 641                                              string_builder);
 642
 643       g_string_append_printf (string_builder, "%*s</arg>\n", indent, "");
 644     }
 645
 646 }
 647
 648 static void
 649 g_dbus_method_info_generate_xml (GDBusMethodInfo *info,
 650                                  guint            indent,
 651                                  GString         *string_builder)
 652 {
 653   guint n;
 654
 655   g_string_append_printf (string_builder, "%*s<method name=\"%s\"",
 656                           indent, "",
 657                           info->name);
 658
 659   if (info->annotations == NULL && info->in_args == NULL && info->out_args == NULL)
 660     {
 661       g_string_append (string_builder, "/>\n");
 662     }
 663   else
 664     {
 665       g_string_append (string_builder, ">\n");
 666
 667       for (n = 0; info->annotations != NULL && info->annotations[n] != NULL; n++)
 668         g_dbus_annotation_info_generate_xml (info->annotations[n],
 669                                              indent + 2,
 670                                              string_builder);
 671
 672       for (n = 0; info->in_args != NULL && info->in_args[n] != NULL; n++)
 673         g_dbus_arg_info_generate_xml (info->in_args[n],
 674                                       indent + 2,
 675                                       "direction=\"in\"",
 676                                       string_builder);
 677
 678       for (n = 0; info->out_args != NULL && info->out_args[n] != NULL; n++)
 679         g_dbus_arg_info_generate_xml (info->out_args[n],
 680                                       indent + 2,
 681                                       "direction=\"out\"",
 682                                       string_builder);
 683
 684       g_string_append_printf (string_builder, "%*s</method>\n", indent, "");
 685     }
 686 }
 687
 688 static void
 689 g_dbus_signal_info_generate_xml (GDBusSignalInfo *info,
 690                                  guint            indent,
 691                                  GString         *string_builder)
 692 {
 693   guint n;
 694
 695   g_string_append_printf (string_builder, "%*s<signal name=\"%s\"",
 696                           indent, "",
 697                           info->name);
 698
 699   if (info->annotations == NULL && info->args == NULL)
 700     {
 701       g_string_append (string_builder, "/>\n");
 702     }
 703   else
 704     {
 705       g_string_append (string_builder, ">\n");
 706
 707       for (n = 0; info->annotations != NULL && info->annotations[n] != NULL; n++)
 708         g_dbus_annotation_info_generate_xml (info->annotations[n],
 709                                              indent + 2,
 710                                              string_builder);
 711
 712       for (n = 0; info->args != NULL && info->args[n] != NULL; n++)
 713         g_dbus_arg_info_generate_xml (info->args[n],
 714                                       indent + 2,
 715                                       NULL,
 716                                       string_builder);
 717
 718       g_string_append_printf (string_builder, "%*s</signal>\n", indent, "");
 719     }
 720 }
 721
 722 static void
 723 g_dbus_property_info_generate_xml (GDBusPropertyInfo *info,
 724                                    guint              indent,
 725                                    GString           *string_builder)
 726 {
 727   guint n;
 728   const gchar *access_string;
 729
 730   if ((info->flags & G_DBUS_PROPERTY_INFO_FLAGS_READABLE) &&
 731       (info->flags & G_DBUS_PROPERTY_INFO_FLAGS_WRITABLE))
 732     {
 733       access_string = "readwrite";
 734     }
 735   else if (info->flags & G_DBUS_PROPERTY_INFO_FLAGS_READABLE)
 736     {
 737       access_string = "read";
 738     }
 739   else if (info->flags & G_DBUS_PROPERTY_INFO_FLAGS_WRITABLE)
 740     {
 741       access_string = "write";
 742     }
 743   else
 744     {
 745       g_assert_not_reached ();
 746     }
 747
 748   g_string_append_printf (string_builder, "%*s<property type=\"%s\" name=\"%s\" access=\"%s\"",
 749                           indent, "",
 750                           info->signature,
 751                           info->name,
 752                           access_string);
 753
 754   if (info->annotations == NULL)
 755     {
 756       g_string_append (string_builder, "/>\n");
 757     }
 758   else
 759     {
 760       g_string_append (string_builder, ">\n");
 761
 762       for (n = 0; info->annotations != NULL && info->annotations[n] != NULL; n++)
 763         g_dbus_annotation_info_generate_xml (info->annotations[n],
 764                                                indent + 2,
 765                                                string_builder);
 766
 767       g_string_append_printf (string_builder, "%*s</property>\n", indent, "");
 768     }
 769
 770 }
 771
 772 /**
 773  * g_dbus_interface_info_generate_xml:
 774  * @info: A #GDBusNodeInfo
 775  * @indent: Indentation level.
 776  * @string_builder: (out): A #GString to to append XML data to.
 777  *
 778  * Appends an XML representation of @info (and its children) to @string_builder.
 779  *
 780  * This function is typically used for generating introspection XML
 781  * documents at run-time for handling the
 782  * <literal>org.freedesktop.DBus.Introspectable.Introspect</literal>
 783  * method.
 784  *
 785  * Since: 2.26
 786  */
 787 void
 788 g_dbus_interface_info_generate_xml (GDBusInterfaceInfo *info,
 789                                     guint               indent,
 790                                     GString            *string_builder)
 791 {
 792   guint n;
 793
 794   g_string_append_printf (string_builder, "%*s<interface name=\"%s\">\n",
 795                           indent, "",
 796                           info->name);
 797
 798   for (n = 0; info->annotations != NULL && info->annotations[n] != NULL; n++)
 799     g_dbus_annotation_info_generate_xml (info->annotations[n],
 800                                          indent + 2,
 801                                          string_builder);
 802
 803   for (n = 0; info->methods != NULL && info->methods[n] != NULL; n++)
 804     g_dbus_method_info_generate_xml (info->methods[n],
 805                                      indent + 2,
 806                                      string_builder);
 807
 808   for (n = 0; info->signals != NULL && info->signals[n] != NULL; n++)
 809     g_dbus_signal_info_generate_xml (info->signals[n],
 810                                      indent + 2,
 811                                      string_builder);
 812
 813   for (n = 0; info->properties != NULL && info->properties[n] != NULL; n++)
 814     g_dbus_property_info_generate_xml (info->properties[n],
 815                                        indent + 2,
 816                                        string_builder);
 817
 818   g_string_append_printf (string_builder, "%*s</interface>\n", indent, "");
 819 }
 820
 821 /**
 822  * g_dbus_node_info_generate_xml:
 823  * @info: A #GDBusNodeInfo.
 824  * @indent: Indentation level.
 825  * @string_builder: (out): A #GString to to append XML data to.
 826  *
 827  * Appends an XML representation of @info (and its children) to @string_builder.
 828  *
 829  * This function is typically used for generating introspection XML documents at run-time for
 830  * handling the <literal>org.freedesktop.DBus.Introspectable.Introspect</literal> method.
 831  *
 832  * Since: 2.26
 833  */
 834 void
 835 g_dbus_node_info_generate_xml (GDBusNodeInfo *info,
 836                                guint          indent,
 837                                GString       *string_builder)
 838 {
 839   guint n;
 840
 841   g_string_append_printf (string_builder, "%*s<node", indent, "");
 842   if (info->path != NULL)
 843     g_string_append_printf (string_builder, " name=\"%s\"", info->path);
 844
 845   if (info->interfaces == NULL && info->nodes == NULL && info->annotations == NULL)
 846     {
 847       g_string_append (string_builder, "/>\n");
 848     }
 849   else
 850     {
 851       g_string_append (string_builder, ">\n");
 852
 853       for (n = 0; info->annotations != NULL && info->annotations[n] != NULL; n++)
 854         g_dbus_annotation_info_generate_xml (info->annotations[n],
 855                                              indent + 2,
 856                                              string_builder);
 857
 858       for (n = 0; info->interfaces != NULL && info->interfaces[n] != NULL; n++)
 859         g_dbus_interface_info_generate_xml (info->interfaces[n],
 860                                             indent + 2,
 861                                             string_builder);
 862
 863       for (n = 0; info->nodes != NULL && info->nodes[n] != NULL; n++)
 864         g_dbus_node_info_generate_xml (info->nodes[n],
 865                                        indent + 2,
 866                                        string_builder);
 867
 868       g_string_append_printf (string_builder, "%*s</node>\n", indent, "");
 869     }
 870 }
 871
 872 /* ---------------------------------------------------------------------------------------------------- */
 873
 874 static GDBusAnnotationInfo **
 875 parse_data_steal_annotations (ParseData *data,
 876                               guint     *out_num_elements)
 877 {
 878   GDBusAnnotationInfo **ret;
 879   if (out_num_elements != NULL)
 880     *out_num_elements = data->annotations->len;
 881   if (data->annotations == NULL)
 882     ret = NULL;
 883   else
 884     {
 885       g_ptr_array_add (data->annotations, NULL);
 886       ret = (GDBusAnnotationInfo **) g_ptr_array_free (data->annotations, FALSE);
 887     }
 888   data->annotations = g_ptr_array_new ();
 889   return ret;
 890 }
 891
 892 static GDBusArgInfo **
 893 parse_data_steal_args (ParseData *data,
 894                        guint     *out_num_elements)
 895 {
 896   GDBusArgInfo **ret;
 897   if (out_num_elements != NULL)
 898     *out_num_elements = data->args->len;
 899   if (data->args == NULL)
 900     ret = NULL;
 901   else
 902     {
 903       g_ptr_array_add (data->args, NULL);
 904       ret = (GDBusArgInfo **) g_ptr_array_free (data->args, FALSE);
 905     }
 906   data->args = g_ptr_array_new ();
 907   return ret;
 908 }
 909
 910 static GDBusArgInfo **
 911 parse_data_steal_out_args (ParseData *data,
 912                            guint     *out_num_elements)
 913 {
 914   GDBusArgInfo **ret;
 915   if (out_num_elements != NULL)
 916     *out_num_elements = data->out_args->len;
 917   if (data->out_args == NULL)
 918     ret = NULL;
 919   else
 920     {
 921       g_ptr_array_add (data->out_args, NULL);
 922       ret = (GDBusArgInfo **) g_ptr_array_free (data->out_args, FALSE);
 923     }
 924   data->out_args = g_ptr_array_new ();
 925   return ret;
 926 }
 927
 928 static GDBusMethodInfo **
 929 parse_data_steal_methods (ParseData *data,
 930                           guint     *out_num_elements)
 931 {
 932   GDBusMethodInfo **ret;
 933   if (out_num_elements != NULL)
 934     *out_num_elements = data->methods->len;
 935   if (data->methods == NULL)
 936     ret = NULL;
 937   else
 938     {
 939       g_ptr_array_add (data->methods, NULL);
 940       ret = (GDBusMethodInfo **) g_ptr_array_free (data->methods, FALSE);
 941     }
 942   data->methods = g_ptr_array_new ();
 943   return ret;
 944 }
 945
 946 static GDBusSignalInfo **
 947 parse_data_steal_signals (ParseData *data,
 948                           guint     *out_num_elements)
 949 {
 950   GDBusSignalInfo **ret;
 951   if (out_num_elements != NULL)
 952     *out_num_elements = data->signals->len;
 953   if (data->signals == NULL)
 954     ret = NULL;
 955   else
 956     {
 957       g_ptr_array_add (data->signals, NULL);
 958       ret = (GDBusSignalInfo **) g_ptr_array_free (data->signals, FALSE);
 959     }
 960   data->signals = g_ptr_array_new ();
 961   return ret;
 962 }
 963
 964 static GDBusPropertyInfo **
 965 parse_data_steal_properties (ParseData *data,
 966                              guint     *out_num_elements)
 967 {
 968   GDBusPropertyInfo **ret;
 969   if (out_num_elements != NULL)
 970     *out_num_elements = data->properties->len;
 971   if (data->properties == NULL)
 972     ret = NULL;
 973   else
 974     {
 975       g_ptr_array_add (data->properties, NULL);
 976       ret = (GDBusPropertyInfo **) g_ptr_array_free (data->properties, FALSE);
 977     }
 978   data->properties = g_ptr_array_new ();
 979   return ret;
 980 }
 981
 982 static GDBusInterfaceInfo **
 983 parse_data_steal_interfaces (ParseData *data,
 984                              guint     *out_num_elements)
 985 {
 986   GDBusInterfaceInfo **ret;
 987   if (out_num_elements != NULL)
 988     *out_num_elements = data->interfaces->len;
 989   if (data->interfaces == NULL)
 990     ret = NULL;
 991   else
 992     {
 993       g_ptr_array_add (data->interfaces, NULL);
 994       ret = (GDBusInterfaceInfo **) g_ptr_array_free (data->interfaces, FALSE);
 995     }
 996   data->interfaces = g_ptr_array_new ();
 997   return ret;
 998 }
 999
1000 static GDBusNodeInfo **
1001 parse_data_steal_nodes (ParseData *data,
1002                         guint     *out_num_elements)
1003 {
1004   GDBusNodeInfo **ret;
1005   if (out_num_elements != NULL)
1006     *out_num_elements = data->nodes->len;
1007   if (data->nodes == NULL)
1008     ret = NULL;
1009   else
1010     {
1011       g_ptr_array_add (data->nodes, NULL);
1012       ret = (GDBusNodeInfo **) g_ptr_array_free (data->nodes, FALSE);
1013     }
1014   data->nodes = g_ptr_array_new ();
1015   return ret;
1016 }
1017
1018 /* ---------------------------------------------------------------------------------------------------- */
1019
1020 static void
1021 parse_data_free_annotations (ParseData *data)
1022 {
1023   if (data->annotations == NULL)
1024     return;
1025   g_ptr_array_foreach (data->annotations, (GFunc) g_dbus_annotation_info_unref, NULL);
1026   g_ptr_array_free (data->annotations, TRUE);
1027   data->annotations = NULL;
1028 }
1029
1030 static void
1031 parse_data_free_args (ParseData *data)
1032 {
1033   if (data->args == NULL)
1034     return;
1035   g_ptr_array_foreach (data->args, (GFunc) g_dbus_arg_info_unref, NULL);
1036   g_ptr_array_free (data->args, TRUE);
1037   data->args = NULL;
1038 }
1039
1040 static void
1041 parse_data_free_out_args (ParseData *data)
1042 {
1043   if (data->out_args == NULL)
1044     return;
1045   g_ptr_array_foreach (data->out_args, (GFunc) g_dbus_arg_info_unref, NULL);
1046   g_ptr_array_free (data->out_args, TRUE);
1047   data->out_args = NULL;
1048 }
1049
1050 static void
1051 parse_data_free_methods (ParseData *data)
1052 {
1053   if (data->methods == NULL)
1054     return;
1055   g_ptr_array_foreach (data->methods, (GFunc) g_dbus_method_info_unref, NULL);
1056   g_ptr_array_free (data->methods, TRUE);
1057   data->methods = NULL;
1058 }
1059
1060 static void
1061 parse_data_free_signals (ParseData *data)
1062 {
1063   if (data->signals == NULL)
1064     return;
1065   g_ptr_array_foreach (data->signals, (GFunc) g_dbus_signal_info_unref, NULL);
1066   g_ptr_array_free (data->signals, TRUE);
1067   data->signals = NULL;
1068 }
1069
1070 static void
1071 parse_data_free_properties (ParseData *data)
1072 {
1073   if (data->properties == NULL)
1074     return;
1075   g_ptr_array_foreach (data->properties, (GFunc) g_dbus_property_info_unref, NULL);
1076   g_ptr_array_free (data->properties, TRUE);
1077   data->properties = NULL;
1078 }
1079
1080 static void
1081 parse_data_free_interfaces (ParseData *data)
1082 {
1083   if (data->interfaces == NULL)
1084     return;
1085   g_ptr_array_foreach (data->interfaces, (GFunc) g_dbus_interface_info_unref, NULL);
1086   g_ptr_array_free (data->interfaces, TRUE);
1087   data->interfaces = NULL;
1088 }
1089
1090 static void
1091 parse_data_free_nodes (ParseData *data)
1092 {
1093   if (data->nodes == NULL)
1094     return;
1095   g_ptr_array_foreach (data->nodes, (GFunc) g_dbus_node_info_unref, NULL);
1096   g_ptr_array_free (data->nodes, TRUE);
1097   data->nodes = NULL;
1098 }
1099
1100 /* ---------------------------------------------------------------------------------------------------- */
1101
1102 static GDBusAnnotationInfo *
1103 parse_data_get_annotation (ParseData *data,
1104                            gboolean   create_new)
1105 {
1106   if (create_new)
1107     g_ptr_array_add (data->annotations, g_new0 (GDBusAnnotationInfo, 1));
1108   return data->annotations->pdata[data->annotations->len - 1];
1109 }
1110
1111 static GDBusArgInfo *
1112 parse_data_get_arg (ParseData *data,
1113                     gboolean   create_new)
1114 {
1115   if (create_new)
1116     g_ptr_array_add (data->args, g_new0 (GDBusArgInfo, 1));
1117   return data->args->pdata[data->args->len - 1];
1118 }
1119
1120 static GDBusArgInfo *
1121 parse_data_get_out_arg (ParseData *data,
1122                         gboolean   create_new)
1123 {
1124   if (create_new)
1125     g_ptr_array_add (data->out_args, g_new0 (GDBusArgInfo, 1));
1126   return data->out_args->pdata[data->out_args->len - 1];
1127 }
1128
1129 static GDBusMethodInfo *
1130 parse_data_get_method (ParseData *data,
1131                        gboolean   create_new)
1132 {
1133   if (create_new)
1134     g_ptr_array_add (data->methods, g_new0 (GDBusMethodInfo, 1));
1135   return data->methods->pdata[data->methods->len - 1];
1136 }
1137
1138 static GDBusSignalInfo *
1139 parse_data_get_signal (ParseData *data,
1140                        gboolean   create_new)
1141 {
1142   if (create_new)
1143     g_ptr_array_add (data->signals, g_new0 (GDBusSignalInfo, 1));
1144   return data->signals->pdata[data->signals->len - 1];
1145 }
1146
1147 static GDBusPropertyInfo *
1148 parse_data_get_property (ParseData *data,
1149                          gboolean   create_new)
1150 {
1151   if (create_new)
1152     g_ptr_array_add (data->properties, g_new0 (GDBusPropertyInfo, 1));
1153   return data->properties->pdata[data->properties->len - 1];
1154 }
1155
1156 static GDBusInterfaceInfo *
1157 parse_data_get_interface (ParseData *data,
1158                           gboolean   create_new)
1159 {
1160   if (create_new)
1161     g_ptr_array_add (data->interfaces, g_new0 (GDBusInterfaceInfo, 1));
1162   return data->interfaces->pdata[data->interfaces->len - 1];
1163 }
1164
1165 static GDBusNodeInfo *
1166 parse_data_get_node (ParseData *data,
1167                      gboolean   create_new)
1168 {
1169   if (create_new)
1170     g_ptr_array_add (data->nodes, g_new0 (GDBusNodeInfo, 1));
1171   return data->nodes->pdata[data->nodes->len - 1];
1172 }
1173
1174 /* ---------------------------------------------------------------------------------------------------- */
1175
1176 static ParseData *
1177 parse_data_new (void)
1178 {
1179   ParseData *data;
1180
1181   data = g_new0 (ParseData, 1);
1182
1183   /* initialize arrays */
1184   parse_data_steal_annotations (data, NULL);
1185   parse_data_steal_args (data, NULL);
1186   parse_data_steal_out_args (data, NULL);
1187   parse_data_steal_methods (data, NULL);
1188   parse_data_steal_signals (data, NULL);
1189   parse_data_steal_properties (data, NULL);
1190   parse_data_steal_interfaces (data, NULL);
1191   parse_data_steal_nodes (data, NULL);
1192
1193   return data;
1194 }
1195
1196 static void
1197 parse_data_free (ParseData *data)
1198 {
1199   GSList *l;
1200
1201   /* free stack of annotation arrays */
1202   for (l = data->annotations_stack; l != NULL; l = l->next)
1203     {
1204       GPtrArray *annotations = l->data;
1205       g_ptr_array_foreach (annotations, (GFunc) g_dbus_annotation_info_unref, NULL);
1206       g_ptr_array_free (annotations, TRUE);
1207     }
1208   g_slist_free (data->annotations_stack);
1209
1210   /* free stack of interface arrays */
1211   for (l = data->interfaces_stack; l != NULL; l = l->next)
1212     {
1213       GPtrArray *interfaces = l->data;
1214       g_ptr_array_foreach (interfaces, (GFunc) g_dbus_interface_info_unref, NULL);
1215       g_ptr_array_free (interfaces, TRUE);
1216     }
1217   g_slist_free (data->interfaces_stack);
1218
1219   /* free stack of node arrays */
1220   for (l = data->nodes_stack; l != NULL; l = l->next)
1221     {
1222       GPtrArray *nodes = l->data;
1223       g_ptr_array_foreach (nodes, (GFunc) g_dbus_node_info_unref, NULL);
1224       g_ptr_array_free (nodes, TRUE);
1225     }
1226   g_slist_free (data->nodes_stack);
1227
1228   /* free arrays (data->annotations, data->interfaces and data->nodes have been freed above) */
1229   parse_data_free_args (data);
1230   parse_data_free_out_args (data);
1231   parse_data_free_methods (data);
1232   parse_data_free_signals (data);
1233   parse_data_free_properties (data);
1234   parse_data_free_interfaces (data);
1235   parse_data_free_annotations (data);
1236   parse_data_free_nodes (data);
1237
1238   g_free (data);
1239 }
1240
1241 /* ---------------------------------------------------------------------------------------------------- */
1242
1243 static void
1244 parser_start_element (GMarkupParseContext  *context,
1245                       const gchar          *element_name,
1246                       const gchar         **attribute_names,
1247                       const gchar         **attribute_values,
1248                       gpointer              user_data,
1249                       GError              **error)
1250 {
1251   ParseData *data = user_data;
1252   GSList *stack;
1253   const gchar *name;
1254   const gchar *type;
1255   const gchar *access;
1256   const gchar *direction;
1257   const gchar *value;
1258
1259   name = NULL;
1260   type = NULL;
1261   access = NULL;
1262   direction = NULL;
1263   value = NULL;
1264
1265   stack = (GSList *) g_markup_parse_context_get_element_stack (context);
1266
1267   /* ---------------------------------------------------------------------------------------------------- */
1268   if (strcmp (element_name, "node") == 0)
1269     {
1270       if (!(g_slist_length (stack) >= 1 || strcmp (stack->next->data, "node") != 0))
1271         {
1272           g_set_error_literal (error,
1273                                G_MARKUP_ERROR,
1274                                G_MARKUP_ERROR_INVALID_CONTENT,
1275                                "<node> elements can only be top-level or embedded in other <node> elements");
1276           goto out;
1277         }
1278
1279       if (!g_markup_collect_known_attributes (element_name,
1280                                               attribute_names,
1281                                               attribute_values,
1282                                               error,
1283                                               G_MARKUP_COLLECT_STRING | G_MARKUP_COLLECT_OPTIONAL, "name", &name,
1284                                               G_MARKUP_COLLECT_INVALID))
1285         goto out;
1286
1287       g_dbus_node_info_set (data,
1288                             parse_data_get_node (data, TRUE),
1289                             name,
1290                             NULL,
1291                             NULL,
1292                             NULL);
1293
1294       /* push the currently retrieved interfaces and nodes on the stack and prepare new arrays */
1295       data->interfaces_stack = g_slist_prepend (data->interfaces_stack, data->interfaces);
1296       data->interfaces = NULL;
1297       parse_data_steal_interfaces (data, NULL);
1298
1299       data->nodes_stack = g_slist_prepend (data->nodes_stack, data->nodes);
1300       data->nodes = NULL;
1301       parse_data_steal_nodes (data, NULL);
1302
1303     }
1304   /* ---------------------------------------------------------------------------------------------------- */
1305   else if (strcmp (element_name, "interface") == 0)
1306     {
1307       if (g_slist_length (stack) < 2 || strcmp (stack->next->data, "node") != 0)
1308         {
1309           g_set_error_literal (error,
1310                                G_MARKUP_ERROR,
1311                                G_MARKUP_ERROR_INVALID_CONTENT,
1312                                "<interface> elements can only be embedded in <node> elements");
1313           goto out;
1314         }
1315
1316       if (!g_markup_collect_known_attributes (element_name,
1317                                               attribute_names,
1318                                               attribute_values,
1319                                               error,
1320                                               G_MARKUP_COLLECT_STRING, "name", &name,
1321                                               G_MARKUP_COLLECT_INVALID))
1322         goto out;
1323
1324       g_dbus_interface_info_set (data,
1325                                  parse_data_get_interface (data, TRUE),
1326                                  name,
1327                                  NULL,
1328                                  NULL,
1329                                  NULL,
1330                                  NULL);
1331
1332     }
1333   /* ---------------------------------------------------------------------------------------------------- */
1334   else if (strcmp (element_name, "method") == 0)
1335     {
1336       if (g_slist_length (stack) < 2 || strcmp (stack->next->data, "interface") != 0)
1337         {
1338           g_set_error_literal (error,
1339                                G_MARKUP_ERROR,
1340                                G_MARKUP_ERROR_INVALID_CONTENT,
1341                                "<method> elements can only be embedded in <interface> elements");
1342           goto out;
1343         }
1344
1345       if (!g_markup_collect_known_attributes (element_name,
1346                                               attribute_names,
1347                                               attribute_values,
1348                                               error,
1349                                               G_MARKUP_COLLECT_STRING, "name", &name,
1350                                               G_MARKUP_COLLECT_INVALID))
1351         goto out;
1352
1353       g_dbus_method_info_set (data,
1354                               parse_data_get_method (data, TRUE),
1355                               name,
1356                               NULL,
1357                               NULL,
1358                               NULL);
1359
1360       data->num_args = 0;
1361
1362     }
1363   /* ---------------------------------------------------------------------------------------------------- */
1364   else if (strcmp (element_name, "signal") == 0)
1365     {
1366       if (g_slist_length (stack) < 2 || strcmp (stack->next->data, "interface") != 0)
1367         {
1368           g_set_error_literal (error,
1369                                G_MARKUP_ERROR,
1370                                G_MARKUP_ERROR_INVALID_CONTENT,
1371                                "<signal> elements can only be embedded in <interface> elements");
1372           goto out;
1373         }
1374
1375       if (!g_markup_collect_known_attributes (element_name,
1376                                               attribute_names,
1377                                               attribute_values,
1378                                               error,
1379                                               G_MARKUP_COLLECT_STRING, "name", &name,
1380                                               G_MARKUP_COLLECT_INVALID))
1381         goto out;
1382
1383       g_dbus_signal_info_set (data,
1384                               parse_data_get_signal (data, TRUE),
1385                               name,
1386                               NULL,
1387                               NULL);
1388
1389       data->num_args = 0;
1390
1391     }
1392   /* ---------------------------------------------------------------------------------------------------- */
1393   else if (strcmp (element_name, "property") == 0)
1394     {
1395       GDBusPropertyInfoFlags flags;
1396
1397       if (g_slist_length (stack) < 2 || strcmp (stack->next->data, "interface") != 0)
1398         {
1399           g_set_error_literal (error,
1400                                G_MARKUP_ERROR,
1401                                G_MARKUP_ERROR_INVALID_CONTENT,
1402                                "<property> elements can only be embedded in <interface> elements");
1403           goto out;
1404         }
1405
1406       if (!g_markup_collect_known_attributes (element_name,
1407                                               attribute_names,
1408                                               attribute_values,
1409                                               error,
1410                                               G_MARKUP_COLLECT_STRING, "name", &name,
1411                                               G_MARKUP_COLLECT_STRING, "type", &type,
1412                                               G_MARKUP_COLLECT_STRING, "access", &access,
1413                                               G_MARKUP_COLLECT_INVALID))
1414         goto out;
1415
1416       if (strcmp (access, "read") == 0)
1417         flags = G_DBUS_PROPERTY_INFO_FLAGS_READABLE;
1418       else if (strcmp (access, "write") == 0)
1419         flags = G_DBUS_PROPERTY_INFO_FLAGS_WRITABLE;
1420       else if (strcmp (access, "readwrite") == 0)
1421         flags = G_DBUS_PROPERTY_INFO_FLAGS_READABLE | G_DBUS_PROPERTY_INFO_FLAGS_WRITABLE;
1422       else
1423         {
1424           g_set_error (error,
1425                        G_MARKUP_ERROR,
1426                        G_MARKUP_ERROR_INVALID_CONTENT,
1427                        "Unknown value '%s' of access attribute for element <property>",
1428                        access);
1429           goto out;
1430         }
1431
1432       g_dbus_property_info_set (data,
1433                                 parse_data_get_property (data, TRUE),
1434                                 name,
1435                                 type,
1436                                 flags,
1437                                 NULL);
1438
1439     }
1440   /* ---------------------------------------------------------------------------------------------------- */
1441   else if (strcmp (element_name, "arg") == 0)
1442     {
1443       gboolean is_in;
1444       gchar *name_to_use;
1445
1446       if (g_slist_length (stack) < 2 ||
1447           (strcmp (stack->next->data, "method") != 0 &&
1448            strcmp (stack->next->data, "signal") != 0))
1449         {
1450           g_set_error_literal (error,
1451                                G_MARKUP_ERROR,
1452                                G_MARKUP_ERROR_INVALID_CONTENT,
1453                                "<arg> elements can only be embedded in <method> or <signal> elements");
1454           goto out;
1455         }
1456
1457       if (!g_markup_collect_known_attributes (element_name,
1458                                               attribute_names,
1459                                               attribute_values,
1460                                               error,
1461                                               G_MARKUP_COLLECT_STRING | G_MARKUP_COLLECT_OPTIONAL, "name", &name,
1462                                               G_MARKUP_COLLECT_STRING | G_MARKUP_COLLECT_OPTIONAL, "direction", &direction,
1463                                               G_MARKUP_COLLECT_STRING, "type", &type,
1464                                               G_MARKUP_COLLECT_INVALID))
1465         goto out;
1466
1467       if (strcmp (stack->next->data, "method") == 0)
1468         is_in = TRUE;
1469       else
1470         is_in = FALSE;
1471       if (direction != NULL)
1472         {
1473           if (strcmp (direction, "in") == 0)
1474             is_in = TRUE;
1475           else if (strcmp (direction, "out") == 0)
1476             is_in = FALSE;
1477           else
1478             {
1479               g_set_error (error,
1480                            G_MARKUP_ERROR,
1481                            G_MARKUP_ERROR_INVALID_CONTENT,
1482                            "Unknown value '%s' of direction attribute",
1483                            direction);
1484               goto out;
1485             }
1486         }
1487
1488       if (is_in && strcmp (stack->next->data, "signal") == 0)
1489         {
1490           g_set_error_literal (error,
1491                                G_MARKUP_ERROR,
1492                                G_MARKUP_ERROR_INVALID_CONTENT,
1493                                "Only direction 'out' is allowed for <arg> elements embedded in <signal>");
1494           goto out;
1495         }
1496
1497       if (name == NULL)
1498         name_to_use = g_strdup_printf ("arg_%d", data->num_args);
1499       else
1500         name_to_use = g_strdup (name);
1501       data->num_args++;
1502
1503       if (is_in)
1504         {
1505           g_dbus_arg_info_set (data,
1506                                parse_data_get_arg (data, TRUE),
1507                                name_to_use,
1508                                type,
1509                                NULL);
1510           data->last_arg_was_in = TRUE;
1511         }
1512       else
1513         {
1514           g_dbus_arg_info_set (data,
1515                                parse_data_get_out_arg (data, TRUE),
1516                                name_to_use,
1517                                type,
1518                                NULL);
1519           data->last_arg_was_in = FALSE;
1520
1521         }
1522
1523       g_free (name_to_use);
1524     }
1525   /* ---------------------------------------------------------------------------------------------------- */
1526   else if (strcmp (element_name, "annotation") == 0)
1527     {
1528       if (g_slist_length (stack) < 2 ||
1529           (strcmp (stack->next->data, "node") != 0 &&
1530            strcmp (stack->next->data, "interface") != 0 &&
1531            strcmp (stack->next->data, "signal") != 0 &&
1532            strcmp (stack->next->data, "method") != 0 &&
1533            strcmp (stack->next->data, "property") != 0 &&
1534            strcmp (stack->next->data, "arg") != 0 &&
1535            strcmp (stack->next->data, "annotation") != 0))
1536         {
1537           g_set_error_literal (error,
1538                                G_MARKUP_ERROR,
1539                                G_MARKUP_ERROR_INVALID_CONTENT,
1540                                "<annotation> elements can only be embedded in <node>, <interface>, <signal>, <method>, <property>, <arg> or <annotation> elements");
1541           goto out;
1542         }
1543
1544       if (!g_markup_collect_known_attributes (element_name,
1545                                               attribute_names,
1546                                               attribute_values,
1547                                               error,
1548                                               G_MARKUP_COLLECT_STRING, "name", &name,
1549                                               G_MARKUP_COLLECT_STRING, "value", &value,
1550                                               G_MARKUP_COLLECT_INVALID))
1551         goto out;
1552
1553       g_dbus_annotation_info_set (data,
1554                                   parse_data_get_annotation (data, TRUE),
1555                                   name,
1556                                   value,
1557                                   NULL);
1558     }
1559   /* ---------------------------------------------------------------------------------------------------- */
1560   else
1561     {
1562       /* don't bail on unknown elements; just ignore them */
1563     }
1564   /* ---------------------------------------------------------------------------------------------------- */
1565
1566   /* push the currently retrieved annotations on the stack and prepare a new one */
1567   data->annotations_stack = g_slist_prepend (data->annotations_stack, data->annotations);
1568   data->annotations = NULL;
1569   parse_data_steal_annotations (data, NULL);
1570
1571  out:
1572   ;
1573 }
1574
1575 /* ---------------------------------------------------------------------------------------------------- */
1576
1577 static GDBusAnnotationInfo **
1578 steal_annotations (ParseData *data)
1579 {
1580   return parse_data_steal_annotations (data, NULL);
1581 }
1582
1583
1584 static void
1585 parser_end_element (GMarkupParseContext  *context,
1586                     const gchar          *element_name,
1587                     gpointer              user_data,
1588                     GError              **error)
1589 {
1590   ParseData *data = user_data;
1591   gboolean have_popped_annotations;
1592
1593   have_popped_annotations = FALSE;
1594
1595   if (strcmp (element_name, "node") == 0)
1596     {
1597       guint num_nodes;
1598       guint num_interfaces;
1599       GDBusNodeInfo **nodes;
1600       GDBusInterfaceInfo **interfaces;
1601
1602       nodes = parse_data_steal_nodes (data, &num_nodes);
1603       interfaces = parse_data_steal_interfaces (data, &num_interfaces);
1604
1605       /* destroy the nodes, interfaces for scope we're exiting and and pop the nodes, interfaces from the
1606        * scope we're reentering
1607        */
1608       parse_data_free_interfaces (data);
1609       data->interfaces = (GPtrArray *) data->interfaces_stack->data;
1610       data->interfaces_stack = g_slist_remove (data->interfaces_stack, data->interfaces_stack->data);
1611
1612       parse_data_free_nodes (data);
1613       data->nodes = (GPtrArray *) data->nodes_stack->data;
1614       data->nodes_stack = g_slist_remove (data->nodes_stack, data->nodes_stack->data);
1615
1616       g_dbus_node_info_set (data,
1617                             parse_data_get_node (data, FALSE),
1618                             NULL,
1619                             interfaces,
1620                             nodes,
1621                             steal_annotations (data));
1622
1623     }
1624   else if (strcmp (element_name, "interface") == 0)
1625     {
1626       guint num_methods;
1627       guint num_signals;
1628       guint num_properties;
1629       GDBusMethodInfo **methods;
1630       GDBusSignalInfo **signals;
1631       GDBusPropertyInfo **properties;
1632
1633       methods    = parse_data_steal_methods    (data, &num_methods);
1634       signals    = parse_data_steal_signals    (data, &num_signals);
1635       properties = parse_data_steal_properties (data, &num_properties);
1636
1637       g_dbus_interface_info_set (data,
1638                                  parse_data_get_interface (data, FALSE),
1639                                  NULL,
1640                                  methods,
1641                                  signals,
1642                                  properties,
1643                                  steal_annotations (data));
1644
1645     }
1646   else if (strcmp (element_name, "method") == 0)
1647     {
1648       guint in_num_args;
1649       guint out_num_args;
1650       GDBusArgInfo **in_args;
1651       GDBusArgInfo **out_args;
1652
1653       in_args  = parse_data_steal_args     (data, &in_num_args);
1654       out_args = parse_data_steal_out_args (data, &out_num_args);
1655
1656       g_dbus_method_info_set (data,
1657                               parse_data_get_method (data, FALSE),
1658                               NULL,
1659                               in_args,
1660                               out_args,
1661                               steal_annotations (data));
1662     }
1663   else if (strcmp (element_name, "signal") == 0)
1664     {
1665       guint num_args;
1666       GDBusArgInfo **args;
1667
1668       args = parse_data_steal_out_args (data, &num_args);
1669
1670       g_dbus_signal_info_set (data,
1671                               parse_data_get_signal (data, FALSE),
1672                               NULL,
1673                               args,
1674                               steal_annotations (data));
1675     }
1676   else if (strcmp (element_name, "property") == 0)
1677     {
1678       g_dbus_property_info_set (data,
1679                                 parse_data_get_property (data, FALSE),
1680                                 NULL,
1681                                 NULL,
1682                                 G_DBUS_PROPERTY_INFO_FLAGS_NONE,
1683                                 steal_annotations (data));
1684     }
1685   else if (strcmp (element_name, "arg") == 0)
1686     {
1687       g_dbus_arg_info_set (data,
1688                            data->last_arg_was_in ? parse_data_get_arg (data, FALSE) : parse_data_get_out_arg (data, FALSE),
1689                            NULL,
1690                            NULL,
1691                            steal_annotations (data));
1692     }
1693   else if (strcmp (element_name, "annotation") == 0)
1694     {
1695       GDBusAnnotationInfo **embedded_annotations;
1696
1697       embedded_annotations = steal_annotations (data);
1698
1699       /* destroy the annotations for scope we're exiting and and pop the annotations from the scope we're reentering */
1700       parse_data_free_annotations (data);
1701       data->annotations = (GPtrArray *) data->annotations_stack->data;
1702       data->annotations_stack = g_slist_remove (data->annotations_stack, data->annotations_stack->data);
1703
1704       have_popped_annotations = TRUE;
1705
1706       g_dbus_annotation_info_set (data,
1707                                   parse_data_get_annotation (data, FALSE),
1708                                   NULL,
1709                                   NULL,
1710                                   embedded_annotations);
1711     }
1712   else
1713     {
1714       /* don't bail on unknown elements; just ignore them */
1715     }
1716
1717   if (!have_popped_annotations)
1718     {
1719       /* destroy the annotations for scope we're exiting and and pop the annotations from the scope we're reentering */
1720       parse_data_free_annotations (data);
1721       data->annotations = (GPtrArray *) data->annotations_stack->data;
1722       data->annotations_stack = g_slist_remove (data->annotations_stack, data->annotations_stack->data);
1723     }
1724 }
1725
1726 /* ---------------------------------------------------------------------------------------------------- */
1727
1728 static void
1729 parser_error (GMarkupParseContext *context,
1730               GError              *error,
1731               gpointer             user_data)
1732 {
1733   gint line_number;
1734   gint char_number;
1735
1736   g_markup_parse_context_get_position (context, &line_number, &char_number);
1737
1738   g_prefix_error (&error, "%d:%d: ",
1739                   line_number,
1740                   char_number);
1741 }
1742
1743 /* ---------------------------------------------------------------------------------------------------- */
1744
1745 /**
1746  * g_dbus_node_info_new_for_xml:
1747  * @xml_data: Valid D-Bus introspection XML.
1748  * @error: Return location for error.
1749  *
1750  * Parses @xml_data and returns a #GDBusNodeInfo representing the data.
1751  *
1752  * The introspection XML must contain exactly one top-level
1753  * <tag class="starttag">node</tag> element.
1754  *
1755  * Note that this routine is using a
1756  * <link linkend="glib-Simple-XML-Subset-Parser.description">GMarkup</link>-based
1757  * parser that only accepts a subset of valid XML documents.
1758  *
1759  * Returns: A #GDBusNodeInfo structure or %NULL if @error is set. Free
1760  * with g_dbus_node_info_unref().
1761  *
1762  * Since: 2.26
1763  */
1764 GDBusNodeInfo *
1765 g_dbus_node_info_new_for_xml (const gchar  *xml_data,
1766                               GError      **error)
1767 {
1768   GDBusNodeInfo *ret;
1769   GMarkupParseContext *context;
1770   GMarkupParser *parser;
1771   guint num_nodes;
1772   ParseData *data;
1773   GDBusNodeInfo **ughret;
1774
1775   ret = NULL;
1776   parser = NULL;
1777   context = NULL;
1778
1779   parser = g_new0 (GMarkupParser, 1);
1780   parser->start_element = parser_start_element;
1781   parser->end_element   = parser_end_element;
1782   parser->error         = parser_error;
1783
1784   data = parse_data_new ();
1785   context = g_markup_parse_context_new (parser,
1786                                         0,
1787                                         data,
1788                                         (GDestroyNotify) parse_data_free);
1789
1790   if (!g_markup_parse_context_parse (context,
1791                                      xml_data,
1792                                      strlen (xml_data),
1793                                      error))
1794     goto out;
1795
1796   if (!g_markup_parse_context_end_parse (context, error))
1797     goto out;
1798
1799   ughret = parse_data_steal_nodes (data, &num_nodes);
1800
1801   if (num_nodes != 1)
1802     {
1803       guint n;
1804
1805       g_set_error (error,
1806                    G_MARKUP_ERROR,
1807                    G_MARKUP_ERROR_INVALID_CONTENT,
1808                    "Expected a single node in introspection XML, found %d",
1809                    num_nodes);
1810
1811       /* clean up */
1812       for (n = 0; n < num_nodes; n++)
1813         {
1814           g_dbus_node_info_unref (ughret[n]);
1815           ughret[n] = NULL;
1816         }
1817     }
1818
1819   ret = ughret[0];
1820   g_free (ughret);
1821
1822  out:
1823   if (parser != NULL)
1824     g_free (parser);
1825   if (context != NULL)
1826     g_markup_parse_context_free (context);
1827
1828   return ret;
1829 }
1830
1831 /* ---------------------------------------------------------------------------------------------------- */
1832
1833 /**
1834  * g_dbus_annotation_info_lookup:
1835  * @annotations: (array zero-terminated=1) (allow-none): A %NULL-terminated array of annotations or %NULL.
1836  * @name: The name of the annotation to look up.
1837  *
1838  * Looks up the value of an annotation.
1839  *
1840  * This cost of this function is O(n) in number of annotations.
1841  *
1842  * Returns: The value or %NULL if not found. Do not free, it is owned by @annotations.
1843  *
1844  * Since: 2.26
1845  */
1846 const gchar *
1847 g_dbus_annotation_info_lookup (GDBusAnnotationInfo **annotations,
1848                                const gchar          *name)
1849 {
1850   guint n;
1851   const gchar *ret;
1852
1853   ret = NULL;
1854   for (n = 0; annotations != NULL && annotations[n] != NULL; n++)
1855     {
1856       if (g_strcmp0 (annotations[n]->key, name) == 0)
1857         {
1858           ret = annotations[n]->value;
1859           goto out;
1860         }
1861     }
1862
1863  out:
1864   return ret;
1865 }
1866
1867 /* ---------------------------------------------------------------------------------------------------- */
1868
1869 G_LOCK_DEFINE_STATIC (info_cache_lock);
1870
1871 typedef struct
1872 {
1873   gint use_count;
1874
1875   /* gchar* -> GDBusMethodInfo* */
1876   GHashTable *method_name_to_data;
1877
1878   /* gchar* -> GDBusMethodInfo* */
1879   GHashTable *signal_name_to_data;
1880
1881   /* gchar* -> GDBusMethodInfo* */
1882   GHashTable *property_name_to_data;
1883 } InfoCacheEntry;
1884
1885 static void
1886 info_cache_free (InfoCacheEntry *cache)
1887 {
1888   g_assert (cache->use_count == 0);
1889   g_hash_table_unref (cache->method_name_to_data);
1890   g_hash_table_unref (cache->signal_name_to_data);
1891   g_hash_table_unref (cache->property_name_to_data);
1892   g_slice_free (InfoCacheEntry, cache);
1893 }
1894
1895 /* maps from GDBusInterfaceInfo* to InfoCacheEntry* */
1896 static GHashTable *info_cache = NULL;
1897
1898 /* ---------------------------------------------------------------------------------------------------- */
1899
1900 /**
1901  * g_dbus_interface_info_lookup_method:
1902  * @info: A #GDBusInterfaceInfo.
1903  * @name: A D-Bus method name (typically in CamelCase)
1904  *
1905  * Looks up information about a method.
1906  *
1907  * This cost of this function is O(n) in number of methods unless
1908  * g_dbus_interface_info_cache_build() has been used on @info.
1909  *
1910  * Returns: (transfer none): A #GDBusMethodInfo or %NULL if not found. Do not free, it is owned by @info.
1911  *
1912  * Since: 2.26
1913  */
1914 GDBusMethodInfo *
1915 g_dbus_interface_info_lookup_method (GDBusInterfaceInfo *info,
1916                                      const gchar        *name)
1917 {
1918   guint n;
1919   GDBusMethodInfo *result;
1920
1921   G_LOCK (info_cache_lock);
1922   if (G_LIKELY (info_cache != NULL))
1923     {
1924       InfoCacheEntry *cache;
1925       cache = g_hash_table_lookup (info_cache, info);
1926       if (G_LIKELY (cache != NULL))
1927         {
1928           result = g_hash_table_lookup (cache->method_name_to_data, name);
1929           G_UNLOCK (info_cache_lock);
1930           goto out;
1931         }
1932     }
1933   G_UNLOCK (info_cache_lock);
1934
1935   for (n = 0; info->methods != NULL && info->methods[n] != NULL; n++)
1936     {
1937       GDBusMethodInfo *i = info->methods[n];
1938
1939       if (g_strcmp0 (i->name, name) == 0)
1940         {
1941           result = i;
1942           goto out;
1943         }
1944     }
1945
1946   result = NULL;
1947
1948  out:
1949   return result;
1950 }
1951
1952 /* ---------------------------------------------------------------------------------------------------- */
1953
1954 /**
1955  * g_dbus_interface_info_lookup_signal:
1956  * @info: A #GDBusInterfaceInfo.
1957  * @name: A D-Bus signal name (typically in CamelCase)
1958  *
1959  * Looks up information about a signal.
1960  *
1961  * This cost of this function is O(n) in number of signals unless
1962  * g_dbus_interface_info_cache_build() has been used on @info.
1963  *
1964  * Returns: (transfer none): A #GDBusSignalInfo or %NULL if not found. Do not free, it is owned by @info.
1965  *
1966  * Since: 2.26
1967  */
1968 GDBusSignalInfo *
1969 g_dbus_interface_info_lookup_signal (GDBusInterfaceInfo *info,
1970                                      const gchar        *name)
1971 {
1972   guint n;
1973   GDBusSignalInfo *result;
1974
1975   G_LOCK (info_cache_lock);
1976   if (G_LIKELY (info_cache != NULL))
1977     {
1978       InfoCacheEntry *cache;
1979       cache = g_hash_table_lookup (info_cache, info);
1980       if (G_LIKELY (cache != NULL))
1981         {
1982           result = g_hash_table_lookup (cache->signal_name_to_data, name);
1983           G_UNLOCK (info_cache_lock);
1984           goto out;
1985         }
1986     }
1987   G_UNLOCK (info_cache_lock);
1988
1989   for (n = 0; info->signals != NULL && info->signals[n] != NULL; n++)
1990     {
1991       GDBusSignalInfo *i = info->signals[n];
1992
1993       if (g_strcmp0 (i->name, name) == 0)
1994         {
1995           result = i;
1996           goto out;
1997         }
1998     }
1999
2000   result = NULL;
2001
2002  out:
2003   return result;
2004 }
2005
2006 /* ---------------------------------------------------------------------------------------------------- */
2007
2008 /**
2009  * g_dbus_interface_info_lookup_property:
2010  * @info: A #GDBusInterfaceInfo.
2011  * @name: A D-Bus property name (typically in CamelCase).
2012  *
2013  * Looks up information about a property.
2014  *
2015  * This cost of this function is O(n) in number of properties unless
2016  * g_dbus_interface_info_cache_build() has been used on @info.
2017  *
2018  * Returns: (transfer none): A #GDBusPropertyInfo or %NULL if not found. Do not free, it is owned by @info.
2019  *
2020  * Since: 2.26
2021  */
2022 GDBusPropertyInfo *
2023 g_dbus_interface_info_lookup_property (GDBusInterfaceInfo *info,
2024                                        const gchar        *name)
2025 {
2026   guint n;
2027   GDBusPropertyInfo *result;
2028
2029   G_LOCK (info_cache_lock);
2030   if (G_LIKELY (info_cache != NULL))
2031     {
2032       InfoCacheEntry *cache;
2033       cache = g_hash_table_lookup (info_cache, info);
2034       if (G_LIKELY (cache != NULL))
2035         {
2036           result = g_hash_table_lookup (cache->property_name_to_data, name);
2037           G_UNLOCK (info_cache_lock);
2038           goto out;
2039         }
2040     }
2041   G_UNLOCK (info_cache_lock);
2042
2043   for (n = 0; info->properties != NULL && info->properties[n] != NULL; n++)
2044     {
2045       GDBusPropertyInfo *i = info->properties[n];
2046
2047       if (g_strcmp0 (i->name, name) == 0)
2048         {
2049           result = i;
2050           goto out;
2051         }
2052     }
2053
2054   result = NULL;
2055
2056  out:
2057   return result;
2058 }
2059
2060 /* ---------------------------------------------------------------------------------------------------- */
2061
2062 /**
2063  * g_dbus_interface_info_cache_build:
2064  * @info: A #GDBusInterfaceInfo.
2065  *
2066  * Builds a lookup-cache to speed up
2067  * g_dbus_interface_info_lookup_method(),
2068  * g_dbus_interface_info_lookup_signal() and
2069  * g_dbus_interface_info_lookup_property().
2070  *
2071  * If this has already been called with @info, the existing cache is
2072  * used and its use count is increased.
2073  *
2074  * Note that @info cannot be modified until
2075  * g_dbus_interface_info_cache_release() is called.
2076  *
2077  * Since: 2.30
2078  */
2079 void
2080 g_dbus_interface_info_cache_build (GDBusInterfaceInfo *info)
2081 {
2082   InfoCacheEntry *cache;
2083   guint n;
2084
2085   G_LOCK (info_cache_lock);
2086   if (info_cache == NULL)
2087     info_cache = g_hash_table_new_full (g_direct_hash, g_direct_equal, NULL, (GDestroyNotify) info_cache_free);
2088   cache = g_hash_table_lookup (info_cache, info);
2089   if (cache != NULL)
2090     {
2091       cache->use_count += 1;
2092       goto out;
2093     }
2094   cache = g_slice_new0 (InfoCacheEntry);
2095   cache->use_count = 1;
2096   cache->method_name_to_data = g_hash_table_new (g_str_hash, g_str_equal);
2097   cache->signal_name_to_data = g_hash_table_new (g_str_hash, g_str_equal);
2098   cache->property_name_to_data = g_hash_table_new (g_str_hash, g_str_equal);
2099   for (n = 0; info->methods != NULL && info->methods[n] != NULL; n++)
2100     g_hash_table_insert (cache->method_name_to_data, info->methods[n]->name, info->methods[n]);
2101   for (n = 0; info->signals != NULL && info->signals[n] != NULL; n++)
2102     g_hash_table_insert (cache->signal_name_to_data, info->signals[n]->name, info->signals[n]);
2103   for (n = 0; info->properties != NULL && info->properties[n] != NULL; n++)
2104     g_hash_table_insert (cache->property_name_to_data, info->properties[n]->name, info->properties[n]);
2105   g_hash_table_insert (info_cache, info, cache);
2106  out:
2107   G_UNLOCK (info_cache_lock);
2108 }
2109
2110 /**
2111  * g_dbus_interface_info_cache_release:
2112  * @info: A GDBusInterfaceInfo
2113  *
2114  * Decrements the usage count for the cache for @info built by
2115  * g_dbus_interface_info_cache_build() (if any) and frees the
2116  * resources used by the cache if the usage count drops to zero.
2117  *
2118  * Since: 2.30
2119  */
2120 void
2121 g_dbus_interface_info_cache_release (GDBusInterfaceInfo *info)
2122 {
2123   InfoCacheEntry *cache;
2124
2125   G_LOCK (info_cache_lock);
2126   if (G_UNLIKELY (info_cache == NULL))
2127     {
2128       g_warning ("%s called for interface %s but there is no cache", info->name, G_STRFUNC);
2129       goto out;
2130     }
2131
2132   cache = g_hash_table_lookup (info_cache, info);
2133   if (G_UNLIKELY (cache == NULL))
2134     {
2135       g_warning ("%s called for interface %s but there is no cache entry", info->name, G_STRFUNC);
2136       goto out;
2137     }
2138   cache->use_count -= 1;
2139   if (cache->use_count == 0)
2140     {
2141       g_hash_table_remove (info_cache, info);
2142       /* could nuke info_cache itself if empty */
2143     }
2144  out:
2145   G_UNLOCK (info_cache_lock);
2146 }
2147
2148
2149 /* ---------------------------------------------------------------------------------------------------- */
2150
2151 /**
2152  * g_dbus_node_info_lookup_interface:
2153  * @info: A #GDBusNodeInfo.
2154  * @name: A D-Bus interface name.
2155  *
2156  * Looks up information about an interface.
2157  *
2158  * This cost of this function is O(n) in number of interfaces.
2159  *
2160  * Returns: (transfer none): A #GDBusInterfaceInfo or %NULL if not found. Do not free, it is owned by @info.
2161  *
2162  * Since: 2.26
2163  */
2164 GDBusInterfaceInfo *
2165 g_dbus_node_info_lookup_interface (GDBusNodeInfo *info,
2166                                    const gchar   *name)
2167 {
2168   guint n;
2169   GDBusInterfaceInfo *result;
2170
2171   for (n = 0; info->interfaces != NULL && info->interfaces[n] != NULL; n++)
2172     {
2173       GDBusInterfaceInfo *i = info->interfaces[n];
2174
2175       if (g_strcmp0 (i->name, name) == 0)
2176         {
2177           result = i;
2178           goto out;
2179         }
2180     }
2181
2182   result = NULL;
2183
2184  out:
2185   return result;
2186 }