gobject-introspection/gmetadata.c

   1 /* GObject introspection: metadata validation, auxiliary functions
   2  * related to the binary metadata format
   3  *
   4  * Copyright (C) 2005 Matthias Clasen
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the
  18  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19  * Boston, MA 02111-1307, USA.
  20  */
  21
  22 #include <stdlib.h>
  23 #include <string.h>
  24
  25 #include <glib.h>
  26
  27 #include "gmetadata.h"
  28
  29
  30 #define ALIGN_VALUE(this, boundary) \
  31   (( ((unsigned long)(this)) + (((unsigned long)(boundary)) -1)) & (~(((unsigned long)(boundary))-1)))
  32
  33
  34 DirEntry *
  35 g_metadata_get_dir_entry (GMetadata *metadata,
  36                           guint16    index)
  37 {
  38   Header *header = (Header *)metadata->data;
  39
  40   return (DirEntry *)&metadata->data[header->directory + (index - 1) * header->entry_blob_size];
  41 }
  42
  43 void
  44 g_metadata_check_sanity (void)
  45 {
  46   /* Check that struct layout is as we expect */
  47   g_assert (sizeof (Header) == 100);
  48   g_assert (sizeof (DirEntry) == 12);
  49   g_assert (sizeof (SimpleTypeBlob) == 4);
  50   g_assert (sizeof (ArgBlob) == 12);
  51   g_assert (sizeof (SignatureBlob) == 8);
  52   g_assert (sizeof (CommonBlob) == 8);
  53   g_assert (sizeof (FunctionBlob) == 16);
  54   g_assert (sizeof (InterfaceTypeBlob) == 4);
  55   g_assert (sizeof (ArrayTypeBlob) == 8);
  56   g_assert (sizeof (ParamTypeBlob) == 4);
  57   g_assert (sizeof (ErrorTypeBlob) == 4);
  58   g_assert (sizeof (ErrorDomainBlob) == 16);
  59   g_assert (sizeof (ValueBlob) == 12);
  60   g_assert (sizeof (FieldBlob) == 12);
  61   g_assert (sizeof (RegisteredTypeBlob) == 16);
  62   g_assert (sizeof (StructBlob) == 20);
  63   g_assert (sizeof (EnumBlob) == 20);
  64   g_assert (sizeof (PropertyBlob) == 12);
  65   g_assert (sizeof (SignalBlob) == 12);
  66   g_assert (sizeof (VFuncBlob) == 16);
  67   g_assert (sizeof (ObjectBlob) == 32);
  68   g_assert (sizeof (InterfaceBlob) == 28);
  69   g_assert (sizeof (ConstantBlob) == 20);
  70   g_assert (sizeof (AnnotationBlob) == 12);
  71   g_assert (sizeof (UnionBlob) == 28);
  72 }
  73
  74
  75 static gboolean
  76 is_aligned (guint32 offset)
  77 {
  78   return offset == ALIGN_VALUE (offset, 4);
  79 }
  80
  81 #define MAX_NAME_LEN 200
  82
  83 static gboolean
  84 is_name (const guchar *data, guint32 offset)
  85 {
  86   gchar *name;
  87
  88   name = (gchar*)&data[offset];
  89
  90   if (!memchr (name, '\0', MAX_NAME_LEN))
  91     return FALSE;
  92
  93   if (strspn (name, G_CSET_a_2_z G_CSET_A_2_Z G_CSET_DIGITS "-_") < strlen (name))
  94     return FALSE;
  95
  96   return TRUE;
  97 }
  98
  99 static gboolean
 100 validate_header (GMetadata  *metadata,
 101                  GError    **error)
 102 {
 103   Header *header;
 104
 105   if (metadata->len < sizeof (Header))
 106     {
 107       g_set_error (error,
 108                    G_METADATA_ERROR,
 109                    G_METADATA_ERROR_INVALID,
 110                    "The buffer is too short");
 111       return FALSE;
 112     }
 113
 114   header = (Header *)metadata->data;
 115
 116   if (strncmp (header->magic, G_IDL_MAGIC, 16) != 0)
 117     {
 118       g_set_error (error,
 119                    G_METADATA_ERROR,
 120                    G_METADATA_ERROR_INVALID_HEADER,
 121                    "Magic string not found");
 122       return FALSE;
 123
 124     }
 125
 126   if (header->major_version != 1 || header->minor_version != 0)
 127     {
 128       g_set_error (error,
 129                    G_METADATA_ERROR,
 130                    G_METADATA_ERROR_INVALID_HEADER,
 131                    "Version mismatch");
 132       return FALSE;
 133
 134     }
 135
 136   if (header->n_entries < header->n_local_entries)
 137     {
 138       g_set_error (error,
 139                    G_METADATA_ERROR,
 140                    G_METADATA_ERROR_INVALID_HEADER,
 141                    "Inconsistent entry counts");
 142       return FALSE;
 143     }
 144
 145   if (header->size != metadata->len)
 146     {
 147       g_set_error (error,
 148                    G_METADATA_ERROR,
 149                    G_METADATA_ERROR_INVALID_HEADER,
 150                    "Metadata size mismatch");
 151       return FALSE;
 152     }
 153
 154   if (header->entry_blob_size != 12 ||
 155       header->function_blob_size != 16 ||
 156       header->callback_blob_size != 12 ||
 157       header->signal_blob_size != 12 ||
 158       header->vfunc_blob_size != 16 ||
 159       header->arg_blob_size != 12 ||
 160       header->property_blob_size != 12 ||
 161       header->field_blob_size != 12 ||
 162       header->value_blob_size != 12 ||
 163       header->constant_blob_size != 20 ||
 164       header->error_domain_blob_size != 16 ||
 165       header->annotation_blob_size != 12 ||
 166       header->signature_blob_size != 8 ||
 167       header->enum_blob_size != 20 ||
 168       header->struct_blob_size != 20 ||
 169       header->object_blob_size != 32 ||
 170       header->interface_blob_size != 28 ||
 171       header->union_blob_size != 28)
 172     {
 173       g_set_error (error,
 174                    G_METADATA_ERROR,
 175                    G_METADATA_ERROR_INVALID_HEADER,
 176                    "Blob size mismatch");
 177       return FALSE;
 178     }
 179
 180   if (!is_aligned (header->directory))
 181     {
 182       g_set_error (error,
 183                    G_METADATA_ERROR,
 184                    G_METADATA_ERROR_INVALID_HEADER,
 185                    "Misaligned directory");
 186       return FALSE;
 187     }
 188
 189   if (!is_aligned (header->annotations))
 190     {
 191       g_set_error (error,
 192                    G_METADATA_ERROR,
 193                    G_METADATA_ERROR_INVALID_HEADER,
 194                    "Misaligned annotations");
 195       return FALSE;
 196     }
 197
 198   if (header->annotations == 0 && header->n_annotations > 0)
 199     {
 200       g_set_error (error,
 201                    G_METADATA_ERROR,
 202                    G_METADATA_ERROR_INVALID_HEADER,
 203                    "Wrong number of annotations");
 204       return FALSE;
 205     }
 206
 207   if (!is_name (metadata->data, header->namespace))
 208     {
 209       g_set_error (error,
 210                    G_METADATA_ERROR,
 211                    G_METADATA_ERROR_INVALID_HEADER,
 212                    "Invalid namespace name");
 213       return FALSE;
 214     }
 215
 216   return TRUE;
 217 }
 218
 219 static gboolean validate_type_blob (GMetadata     *metadata,
 220                                     guint32        offset,
 221                                     guint32        signature_offset,
 222                                     gboolean       return_type,
 223                                     GError       **error);
 224
 225 static gboolean
 226 validate_array_type_blob (GMetadata     *metadata,
 227                           guint32        offset,
 228                           guint32        signature_offset,
 229                           gboolean       return_type,
 230                           GError       **error)
 231 {
 232   ArrayTypeBlob *blob;
 233
 234   blob = (ArrayTypeBlob*)&metadata->data[offset];
 235
 236   if (!blob->pointer)
 237     {
 238       g_set_error (error,
 239                    G_METADATA_ERROR,
 240                    G_METADATA_ERROR_INVALID_BLOB,
 241                    "Pointer type exected for tag %d", blob->tag);
 242       return FALSE;
 243     }
 244
 245   /* FIXME validate length */
 246
 247   if (!validate_type_blob (metadata,
 248                            offset + G_STRUCT_OFFSET (ArrayTypeBlob, type),
 249                            0, FALSE, error))
 250     return FALSE;
 251
 252   return TRUE;
 253 }
 254
 255 static gboolean
 256 validate_iface_type_blob (GMetadata     *metadata,
 257                           guint32        offset,
 258                           guint32        signature_offset,
 259                           gboolean       return_type,
 260                           GError       **error)
 261 {
 262   InterfaceTypeBlob *blob;
 263   Header *header;
 264
 265   header = (Header *)metadata->data;
 266
 267   blob = (InterfaceTypeBlob*)&metadata->data[offset];
 268
 269   if (blob->interface == 0 || blob->interface > header->n_entries)
 270     {
 271       g_set_error (error,
 272                    G_METADATA_ERROR,
 273                    G_METADATA_ERROR_INVALID_BLOB,
 274                    "Invalid directory index %d", blob->interface);
 275       return FALSE;
 276     }
 277
 278   return TRUE;
 279 }
 280
 281 static gboolean
 282 validate_param_type_blob (GMetadata     *metadata,
 283                           guint32        offset,
 284                           guint32        signature_offset,
 285                           gboolean       return_type,
 286                           gint           n_params,
 287                           GError       **error)
 288 {
 289   ParamTypeBlob *blob;
 290   gint i;
 291
 292   blob = (ParamTypeBlob*)&metadata->data[offset];
 293
 294   if (!blob->pointer)
 295     {
 296       g_set_error (error,
 297                    G_METADATA_ERROR,
 298                    G_METADATA_ERROR_INVALID_BLOB,
 299                    "Pointer type exected for tag %d", blob->tag);
 300       return FALSE;
 301     }
 302
 303   if (blob->n_types != n_params)
 304     {
 305       g_set_error (error,
 306                    G_METADATA_ERROR,
 307                    G_METADATA_ERROR_INVALID_BLOB,
 308                    "Parameter type number mismatch");
 309       return FALSE;
 310     }
 311
 312   for (i = 0; i < n_params; i++)
 313     {
 314       if (!validate_type_blob (metadata,
 315                                offset + sizeof (ParamTypeBlob) +
 316                                i * sizeof (SimpleTypeBlob),
 317                                0, FALSE, error))
 318         return FALSE;
 319     }
 320
 321   return TRUE;
 322 }
 323
 324 static gboolean
 325 validate_error_type_blob (GMetadata     *metadata,
 326                           guint32        offset,
 327                           guint32        signature_offset,
 328                           gboolean       return_type,
 329                           GError       **error)
 330 {
 331   ErrorTypeBlob *blob;
 332   Header *header;
 333   gint i;
 334   DirEntry *entry;
 335
 336   blob = (ErrorTypeBlob*)&metadata->data[offset];
 337
 338   header = (Header *)metadata->data;
 339
 340   if (!blob->pointer)
 341     {
 342       g_set_error (error,
 343                    G_METADATA_ERROR,
 344                    G_METADATA_ERROR_INVALID_BLOB,
 345                    "Pointer type exected for tag %d", blob->tag);
 346       return FALSE;
 347     }
 348
 349   for (i = 0; i < blob->n_domains; i++)
 350     {
 351       if (blob->domains[i] == 0 || blob->domains[i] > header->n_entries)
 352         {
 353           g_set_error (error,
 354                        G_METADATA_ERROR,
 355                        G_METADATA_ERROR_INVALID_BLOB,
 356                        "Invalid directory index %d", blob->domains[i]);
 357           return FALSE;
 358         }
 359
 360       entry = g_metadata_get_dir_entry (metadata, blob->domains[i]);
 361
 362       if (entry->blob_type != BLOB_TYPE_ERROR_DOMAIN &&
 363           (entry->local || entry->blob_type != BLOB_TYPE_INVALID))
 364         {
 365           g_set_error (error,
 366                        G_METADATA_ERROR,
 367                        G_METADATA_ERROR_INVALID_BLOB,
 368                        "Wrong blob type");
 369           return FALSE;
 370         }
 371     }
 372
 373   return TRUE;
 374 }
 375
 376 static gboolean
 377 validate_type_blob (GMetadata     *metadata,
 378                     guint32        offset,
 379                     guint32        signature_offset,
 380                     gboolean       return_type,
 381                     GError       **error)
 382 {
 383   SimpleTypeBlob *simple;
 384   InterfaceTypeBlob *iface;
 385
 386   simple = (SimpleTypeBlob *)&metadata->data[offset];
 387
 388   if (simple->reserved == 0 &&
 389       simple->reserved2 == 0)
 390     {
 391       if (simple->tag >= TYPE_TAG_ARRAY)
 392         {
 393           g_set_error (error,
 394                        G_METADATA_ERROR,
 395                        G_METADATA_ERROR_INVALID_BLOB,
 396                        "Wrong tag in simple type");
 397           return FALSE;
 398         }
 399
 400       if (simple->tag >= TYPE_TAG_UTF8 &&
 401           !simple->pointer)
 402         {
 403           g_set_error (error,
 404                        G_METADATA_ERROR,
 405                        G_METADATA_ERROR_INVALID_BLOB,
 406                        "Pointer type exected for tag %d", simple->tag);
 407           return FALSE;
 408         }
 409
 410       return TRUE;
 411     }
 412
 413   iface = (InterfaceTypeBlob*)&metadata->data[simple->offset];
 414
 415   switch (iface->tag)
 416     {
 417     case TYPE_TAG_ARRAY:
 418       if (!validate_array_type_blob (metadata, simple->offset,
 419                                      signature_offset, return_type, error))
 420         return FALSE;
 421       break;
 422     case TYPE_TAG_INTERFACE:
 423       if (!validate_iface_type_blob (metadata, simple->offset,
 424                                      signature_offset, return_type, error))
 425         return FALSE;
 426       break;
 427     case TYPE_TAG_LIST:
 428     case TYPE_TAG_SLIST:
 429       if (!validate_param_type_blob (metadata, simple->offset,
 430                                      signature_offset, return_type, 1, error))
 431         return FALSE;
 432       break;
 433     case TYPE_TAG_HASH:
 434       if (!validate_param_type_blob (metadata, simple->offset,
 435                                      signature_offset, return_type, 2, error))
 436         return FALSE;
 437       break;
 438     case TYPE_TAG_ERROR:
 439       if (!validate_error_type_blob (metadata, simple->offset,
 440                                      signature_offset, return_type, error))
 441         return FALSE;
 442       break;
 443     default:
 444       g_set_error (error,
 445                    G_METADATA_ERROR,
 446                    G_METADATA_ERROR_INVALID_BLOB,
 447                    "Wrong tag in complex type");
 448       return FALSE;
 449     }
 450
 451   return TRUE;
 452 }
 453
 454 static gboolean
 455 validate_arg_blob (GMetadata     *metadata,
 456                    guint32        offset,
 457                    guint32        signature_offset,
 458                    GError       **error)
 459 {
 460   ArgBlob *blob;
 461
 462   if (metadata->len < offset + sizeof (ArgBlob))
 463     {
 464       g_set_error (error,
 465                    G_METADATA_ERROR,
 466                    G_METADATA_ERROR_INVALID,
 467                    "The buffer is too short");
 468       return FALSE;
 469     }
 470
 471   blob = (ArgBlob*) &metadata->data[offset];
 472
 473   if (!is_name (metadata->data, blob->name))
 474     {
 475       g_set_error (error,
 476                    G_METADATA_ERROR,
 477                    G_METADATA_ERROR_INVALID_BLOB,
 478                    "Invalid argument name");
 479       return FALSE;
 480     }
 481
 482   if (!validate_type_blob (metadata,
 483                            offset + G_STRUCT_OFFSET (ArgBlob, arg_type),
 484                            signature_offset, FALSE, error))
 485     return FALSE;
 486
 487   return TRUE;
 488 }
 489
 490 static gboolean
 491 validate_signature_blob (GMetadata     *metadata,
 492                          guint32        offset,
 493                          GError       **error)
 494 {
 495   SignatureBlob *blob;
 496   gint i;
 497
 498   if (metadata->len < offset + sizeof (SignatureBlob))
 499     {
 500       g_set_error (error,
 501                    G_METADATA_ERROR,
 502                    G_METADATA_ERROR_INVALID,
 503                    "The buffer is too short");
 504       return FALSE;
 505     }
 506
 507   blob = (SignatureBlob*) &metadata->data[offset];
 508
 509   if (blob->return_type.offset != 0)
 510     {
 511       if (!validate_type_blob (metadata,
 512                                offset + G_STRUCT_OFFSET (SignatureBlob, return_type),
 513                                offset, TRUE, error))
 514         return FALSE;
 515     }
 516
 517   for (i = 0; i < blob->n_arguments; i++)
 518     {
 519       if (!validate_arg_blob (metadata,
 520                               offset + sizeof (SignatureBlob) +
 521                               i * sizeof (ArgBlob),
 522                               offset,
 523                               error))
 524         return FALSE;
 525     }
 526
 527   /* FIXME check constraints on return_value */
 528   /* FIXME check array-length pairs */
 529   return TRUE;
 530 }
 531
 532 static gboolean
 533 validate_function_blob (GMetadata     *metadata,
 534                         guint32        offset,
 535                         guint16        container_type,
 536                         GError       **error)
 537 {
 538   FunctionBlob *blob;
 539
 540   if (metadata->len < offset + sizeof (FunctionBlob))
 541     {
 542       g_set_error (error,
 543                    G_METADATA_ERROR,
 544                    G_METADATA_ERROR_INVALID,
 545                    "The buffer is too short");
 546       return FALSE;
 547     }
 548
 549   blob = (FunctionBlob*) &metadata->data[offset];
 550
 551   if (blob->blob_type != BLOB_TYPE_FUNCTION)
 552     {
 553       g_set_error (error,
 554                    G_METADATA_ERROR,
 555                    G_METADATA_ERROR_INVALID_BLOB,
 556                    "Wrong blob type");
 557       return FALSE;
 558     }
 559
 560   if (!is_name (metadata->data, blob->name))
 561     {
 562       g_set_error (error,
 563                    G_METADATA_ERROR,
 564                    G_METADATA_ERROR_INVALID_BLOB,
 565                    "Invalid function name");
 566       return FALSE;
 567     }
 568
 569   if (!is_name (metadata->data, blob->symbol))
 570     {
 571       g_set_error (error,
 572                    G_METADATA_ERROR,
 573                    G_METADATA_ERROR_INVALID_BLOB,
 574                    "Invalid function symbol");
 575       return FALSE;
 576     }
 577
 578   if (blob->constructor)
 579     {
 580       switch (container_type)
 581         {
 582         case BLOB_TYPE_BOXED:
 583         case BLOB_TYPE_OBJECT:
 584         case BLOB_TYPE_INTERFACE:
 585           break;
 586         default:
 587           g_set_error (error,
 588                        G_METADATA_ERROR,
 589                        G_METADATA_ERROR_INVALID_BLOB,
 590                        "Constructor not allowed");
 591           return FALSE;
 592         }
 593     }
 594
 595   if (blob->setter || blob->getter || blob->wraps_vfunc)
 596     {
 597       switch (container_type)
 598         {
 599         case BLOB_TYPE_OBJECT:
 600         case BLOB_TYPE_INTERFACE:
 601           break;
 602         default:
 603           g_set_error (error,
 604                        G_METADATA_ERROR,
 605                        G_METADATA_ERROR_INVALID_BLOB,
 606                        "Setter, getter or wrapper not allowed");
 607           return FALSE;
 608         }
 609     }
 610
 611   if (blob->index)
 612     {
 613       if (!(blob->setter || blob->getter || blob->wraps_vfunc))
 614         {
 615           g_set_error (error,
 616                        G_METADATA_ERROR,
 617                        G_METADATA_ERROR_INVALID_BLOB,
 618                        "Must be setter, getter or wrapper");
 619           return FALSE;
 620         }
 621     }
 622
 623   /* FIXME: validate index range */
 624   /* FIXME: validate "this" argument for methods */
 625   /* FIXME: validate return type for constructors */
 626
 627   if (!validate_signature_blob (metadata, blob->signature, error))
 628     return FALSE;
 629
 630   return TRUE;
 631 }
 632
 633 static gboolean
 634 validate_callback_blob (GMetadata     *metadata,
 635                         guint32        offset,
 636                         GError       **error)
 637 {
 638   CallbackBlob *blob;
 639
 640   if (metadata->len < offset + sizeof (CallbackBlob))
 641     {
 642       g_set_error (error,
 643                    G_METADATA_ERROR,
 644                    G_METADATA_ERROR_INVALID,
 645                    "The buffer is too short");
 646       return FALSE;
 647     }
 648
 649   blob = (CallbackBlob*) &metadata->data[offset];
 650
 651   if (blob->blob_type != BLOB_TYPE_CALLBACK)
 652     {
 653       g_set_error (error,
 654                    G_METADATA_ERROR,
 655                    G_METADATA_ERROR_INVALID_BLOB,
 656                    "Wrong blob type");
 657       return FALSE;
 658     }
 659
 660   if (!is_name (metadata->data, blob->name))
 661     {
 662       g_set_error (error,
 663                    G_METADATA_ERROR,
 664                    G_METADATA_ERROR_INVALID_BLOB,
 665                    "Invalid callback name");
 666       return FALSE;
 667     }
 668
 669   if (!validate_signature_blob (metadata, blob->signature, error))
 670     return FALSE;
 671
 672   return TRUE;
 673 }
 674
 675 static gboolean
 676 validate_constant_blob (GMetadata     *metadata,
 677                         guint32        offset,
 678                         GError       **error)
 679 {
 680   gint value_size[] = {
 681     0, 4, 1, 1, 2, 2, 4, 4, 8, 8,
 682     sizeof (gint), sizeof (guint),
 683     sizeof (glong), sizeof (gulong),
 684     sizeof (gssize), sizeof (gsize),
 685     sizeof (gfloat), sizeof (gdouble),
 686     0, 0
 687   };
 688   ConstantBlob *blob;
 689   SimpleTypeBlob *type;
 690
 691   if (metadata->len < offset + sizeof (ConstantBlob))
 692     {
 693       g_set_error (error,
 694                    G_METADATA_ERROR,
 695                    G_METADATA_ERROR_INVALID,
 696                    "The buffer is too short");
 697       return FALSE;
 698     }
 699
 700   blob = (ConstantBlob*) &metadata->data[offset];
 701
 702   if (blob->blob_type != BLOB_TYPE_CONSTANT)
 703     {
 704       g_set_error (error,
 705                    G_METADATA_ERROR,
 706                    G_METADATA_ERROR_INVALID_BLOB,
 707                    "Wrong blob type");
 708       return FALSE;
 709     }
 710
 711   if (!is_name (metadata->data, blob->name))
 712     {
 713       g_set_error (error,
 714                    G_METADATA_ERROR,
 715                    G_METADATA_ERROR_INVALID_BLOB,
 716                    "Invalid constant name");
 717       return FALSE;
 718     }
 719
 720   if (!validate_type_blob (metadata, offset + G_STRUCT_OFFSET (ConstantBlob, type),
 721                            0, FALSE, error))
 722     return FALSE;
 723
 724   if (!is_aligned (blob->offset))
 725     {
 726       g_set_error (error,
 727                    G_METADATA_ERROR,
 728                    G_METADATA_ERROR_INVALID_BLOB,
 729                    "Misaligned constant value");
 730       return FALSE;
 731     }
 732
 733   type = (SimpleTypeBlob *)&metadata->data[offset + G_STRUCT_OFFSET (ConstantBlob, type)];
 734   if (type->reserved == 0)
 735     {
 736       if (type->tag == 0)
 737         {
 738           g_set_error (error,
 739                        G_METADATA_ERROR,
 740                        G_METADATA_ERROR_INVALID_BLOB,
 741                        "Constant value type void");
 742           return FALSE;
 743         }
 744
 745       if (value_size[type->tag] != 0 &&
 746           blob->size != value_size[type->tag])
 747         {
 748           g_set_error (error,
 749                        G_METADATA_ERROR,
 750                        G_METADATA_ERROR_INVALID_BLOB,
 751                        "Constant value size mismatch");
 752           return FALSE;
 753         }
 754       /* FIXME check string values */
 755     }
 756
 757   return TRUE;
 758 }
 759
 760 static gboolean
 761 validate_value_blob (GMetadata     *metadata,
 762                      guint32        offset,
 763                      GError       **error)
 764 {
 765   ValueBlob *blob;
 766
 767   if (metadata->len < offset + sizeof (ValueBlob))
 768     {
 769       g_set_error (error,
 770                    G_METADATA_ERROR,
 771                    G_METADATA_ERROR_INVALID,
 772                    "The buffer is too short");
 773       return FALSE;
 774     }
 775
 776   blob = (ValueBlob*) &metadata->data[offset];
 777
 778   if (!is_name (metadata->data, blob->name))
 779     {
 780       g_set_error (error,
 781                    G_METADATA_ERROR,
 782                    G_METADATA_ERROR_INVALID_BLOB,
 783                    "Invalid value name");
 784       return FALSE;
 785     }
 786
 787   return TRUE;
 788 }
 789
 790 static gboolean
 791 validate_field_blob (GMetadata     *metadata,
 792                      guint32        offset,
 793                      GError       **error)
 794 {
 795   FieldBlob *blob;
 796
 797   if (metadata->len < offset + sizeof (FieldBlob))
 798     {
 799       g_set_error (error,
 800                    G_METADATA_ERROR,
 801                    G_METADATA_ERROR_INVALID,
 802                    "The buffer is too short");
 803       return FALSE;
 804     }
 805
 806   blob = (FieldBlob*) &metadata->data[offset];
 807
 808   if (!is_name (metadata->data, blob->name))
 809     {
 810       g_set_error (error,
 811                    G_METADATA_ERROR,
 812                    G_METADATA_ERROR_INVALID_BLOB,
 813                    "Invalid field name");
 814       return FALSE;
 815     }
 816
 817   if (!validate_type_blob (metadata,
 818                            offset + G_STRUCT_OFFSET (FieldBlob, type),
 819                            0, FALSE, error))
 820     return FALSE;
 821
 822   return TRUE;
 823 }
 824
 825 static gboolean
 826 validate_property_blob (GMetadata     *metadata,
 827                         guint32        offset,
 828                         GError       **error)
 829 {
 830   PropertyBlob *blob;
 831
 832   if (metadata->len < offset + sizeof (PropertyBlob))
 833     {
 834       g_set_error (error,
 835                    G_METADATA_ERROR,
 836                    G_METADATA_ERROR_INVALID,
 837                    "The buffer is too short");
 838       return FALSE;
 839     }
 840
 841   blob = (PropertyBlob*) &metadata->data[offset];
 842
 843   if (!is_name (metadata->data, blob->name))
 844     {
 845       g_set_error (error,
 846                    G_METADATA_ERROR,
 847                    G_METADATA_ERROR_INVALID_BLOB,
 848                    "Invalid property name");
 849       return FALSE;
 850     }
 851
 852   if (!validate_type_blob (metadata,
 853                            offset + G_STRUCT_OFFSET (PropertyBlob, type),
 854                            0, FALSE, error))
 855     return FALSE;
 856
 857   return TRUE;
 858 }
 859
 860 static gboolean
 861 validate_signal_blob (GMetadata     *metadata,
 862                       guint32        offset,
 863                       guint32        container_offset,
 864                       GError       **error)
 865 {
 866   SignalBlob *blob;
 867   gint n_signals;
 868
 869   if (metadata->len < offset + sizeof (SignalBlob))
 870     {
 871       g_set_error (error,
 872                    G_METADATA_ERROR,
 873                    G_METADATA_ERROR_INVALID,
 874                    "The buffer is too short");
 875       return FALSE;
 876     }
 877
 878   blob = (SignalBlob*) &metadata->data[offset];
 879
 880   if (!is_name (metadata->data, blob->name))
 881     {
 882       g_set_error (error,
 883                    G_METADATA_ERROR,
 884                    G_METADATA_ERROR_INVALID_BLOB,
 885                    "Invalid signal name");
 886       return FALSE;
 887     }
 888
 889   if ((blob->run_first != 0) +
 890       (blob->run_last != 0) +
 891       (blob->run_cleanup != 0) != 1)
 892     {
 893       g_set_error (error,
 894                    G_METADATA_ERROR,
 895                    G_METADATA_ERROR_INVALID_BLOB,
 896                    "Invalid signal run flags");
 897       return FALSE;
 898     }
 899
 900   if (blob->has_class_closure)
 901     {
 902       if (((CommonBlob*)&metadata->data[container_offset])->blob_type == BLOB_TYPE_OBJECT)
 903         {
 904           ObjectBlob *object;
 905
 906           object = (ObjectBlob*)&metadata->data[container_offset];
 907
 908           n_signals = object->n_signals;
 909         }
 910       else
 911         {
 912           InterfaceBlob *iface;
 913
 914           iface = (InterfaceBlob*)&metadata->data[container_offset];
 915
 916           n_signals = iface->n_signals;
 917         }
 918
 919       if (blob->class_closure >= n_signals)
 920         {
 921           g_set_error (error,
 922                        G_METADATA_ERROR,
 923                        G_METADATA_ERROR_INVALID_BLOB,
 924                        "Invalid class closure index");
 925           return FALSE;
 926         }
 927     }
 928
 929   if (!validate_signature_blob (metadata, blob->signature, error))
 930     return FALSE;
 931
 932   return TRUE;
 933 }
 934
 935 static gboolean
 936 validate_vfunc_blob (GMetadata     *metadata,
 937                      guint32        offset,
 938                      guint32        container_offset,
 939                      GError       **error)
 940 {
 941   VFuncBlob *blob;
 942   gint n_vfuncs;
 943
 944   if (metadata->len < offset + sizeof (VFuncBlob))
 945     {
 946       g_set_error (error,
 947                    G_METADATA_ERROR,
 948                    G_METADATA_ERROR_INVALID,
 949                    "The buffer is too short");
 950       return FALSE;
 951     }
 952
 953   blob = (VFuncBlob*) &metadata->data[offset];
 954
 955   if (!is_name (metadata->data, blob->name))
 956     {
 957       g_set_error (error,
 958                    G_METADATA_ERROR,
 959                    G_METADATA_ERROR_INVALID_BLOB,
 960                    "Invalid vfunc name");
 961       return FALSE;
 962     }
 963
 964   if (blob->class_closure)
 965     {
 966       if (((CommonBlob*)&metadata->data[container_offset])->blob_type == BLOB_TYPE_OBJECT)
 967         {
 968           ObjectBlob *object;
 969
 970           object = (ObjectBlob*)&metadata->data[container_offset];
 971
 972           n_vfuncs = object->n_vfuncs;
 973         }
 974       else
 975         {
 976           InterfaceBlob *iface;
 977
 978           iface = (InterfaceBlob*)&metadata->data[container_offset];
 979
 980           n_vfuncs = iface->n_vfuncs;
 981         }
 982
 983       if (blob->class_closure >= n_vfuncs)
 984         {
 985           g_set_error (error,
 986                        G_METADATA_ERROR,
 987                        G_METADATA_ERROR_INVALID_BLOB,
 988                        "Invalid class closure index");
 989           return FALSE;
 990         }
 991     }
 992
 993   if (!validate_signature_blob (metadata, blob->signature, error))
 994     return FALSE;
 995
 996   return TRUE;
 997 }
 998
 999 static gboolean
1000 validate_struct_blob (GMetadata     *metadata,
1001                       guint32        offset,
1002                       guint16        blob_type,
1003                       GError       **error)
1004 {
1005   StructBlob *blob;
1006   gint i;
1007
1008   if (metadata->len < offset + sizeof (StructBlob))
1009     {
1010       g_set_error (error,
1011                    G_METADATA_ERROR,
1012                    G_METADATA_ERROR_INVALID,
1013                    "The buffer is too short");
1014       return FALSE;
1015     }
1016
1017   blob = (StructBlob*) &metadata->data[offset];
1018
1019   if (blob->blob_type != blob_type)
1020     {
1021       g_set_error (error,
1022                    G_METADATA_ERROR,
1023                    G_METADATA_ERROR_INVALID_BLOB,
1024                    "Wrong blob type");
1025       return FALSE;
1026     }
1027
1028   if ((blob->blob_type == BLOB_TYPE_BOXED && blob->unregistered) ||
1029       (blob->blob_type == BLOB_TYPE_STRUCT && !blob->unregistered))
1030     {
1031       g_set_error (error,
1032                    G_METADATA_ERROR,
1033                    G_METADATA_ERROR_INVALID_BLOB,
1034                    "Registration/blob type mismatch");
1035       return FALSE;
1036     }
1037
1038   if (!is_name (metadata->data, blob->name))
1039     {
1040       g_set_error (error,
1041                    G_METADATA_ERROR,
1042                    G_METADATA_ERROR_INVALID_BLOB,
1043                    "Invalid struct name");
1044       return FALSE;
1045     }
1046
1047   if (blob_type == BLOB_TYPE_BOXED)
1048     {
1049       if (!is_name (metadata->data, blob->gtype_name))
1050         {
1051           g_set_error (error,
1052                        G_METADATA_ERROR,
1053                        G_METADATA_ERROR_INVALID_BLOB,
1054                        "Invalid boxed type name");
1055           return FALSE;
1056         }
1057
1058       if (!is_name (metadata->data, blob->gtype_init))
1059         {
1060           g_set_error (error,
1061                        G_METADATA_ERROR,
1062                        G_METADATA_ERROR_INVALID_BLOB,
1063                        "Invalid boxed type init");
1064           return FALSE;
1065         }
1066     }
1067   else
1068     {
1069       if (blob->gtype_name || blob->gtype_init)
1070         {
1071           g_set_error (error,
1072                        G_METADATA_ERROR,
1073                        G_METADATA_ERROR_INVALID_BLOB,
1074                        "Gtype data in struct");
1075           return FALSE;
1076         }
1077     }
1078
1079   if (metadata->len < offset + sizeof (StructBlob) +
1080             blob->n_fields * sizeof (FieldBlob) +
1081             blob->n_methods * sizeof (FunctionBlob))
1082     {
1083       g_set_error (error,
1084                    G_METADATA_ERROR,
1085                    G_METADATA_ERROR_INVALID,
1086                    "The buffer is too short");
1087       return FALSE;
1088     }
1089
1090   for (i = 0; i < blob->n_fields; i++)
1091     {
1092       if (!validate_field_blob (metadata,
1093                                 offset + sizeof (StructBlob) +
1094                                 i * sizeof (FieldBlob),
1095                                 error))
1096         return FALSE;
1097     }
1098
1099   for (i = 0; i < blob->n_methods; i++)
1100     {
1101       if (!validate_function_blob (metadata,
1102                                    offset + sizeof (StructBlob) +
1103                                    blob->n_fields * sizeof (FieldBlob) +
1104                                    i * sizeof (FunctionBlob),
1105                                    blob_type,
1106                                    error))
1107         return FALSE;
1108     }
1109
1110   return TRUE;
1111 }
1112
1113 static gboolean
1114 validate_enum_blob (GMetadata     *metadata,
1115                     guint32        offset,
1116                     guint16        blob_type,
1117                     GError       **error)
1118 {
1119   EnumBlob *blob;
1120   ValueBlob *v1, *v2;
1121   gint i, j;
1122
1123   if (metadata->len < offset + sizeof (EnumBlob))
1124     {
1125       g_set_error (error,
1126                    G_METADATA_ERROR,
1127                    G_METADATA_ERROR_INVALID,
1128                    "The buffer is too short");
1129       return FALSE;
1130     }
1131
1132   blob = (EnumBlob*) &metadata->data[offset];
1133
1134   if (blob->blob_type != blob_type)
1135     {
1136       g_set_error (error,
1137                    G_METADATA_ERROR,
1138                    G_METADATA_ERROR_INVALID_BLOB,
1139                    "Wrong blob type");
1140       return FALSE;
1141     }
1142
1143   if (!blob->unregistered)
1144     {
1145       if (!is_name (metadata->data, blob->gtype_name))
1146         {
1147           g_set_error (error,
1148                        G_METADATA_ERROR,
1149                        G_METADATA_ERROR_INVALID_BLOB,
1150                        "Invalid enum type name");
1151           return FALSE;
1152         }
1153
1154       if (!is_name (metadata->data, blob->gtype_init))
1155         {
1156           g_set_error (error,
1157                        G_METADATA_ERROR,
1158                        G_METADATA_ERROR_INVALID_BLOB,
1159                        "Invalid enum type init");
1160           return FALSE;
1161         }
1162     }
1163   else
1164     {
1165       if (blob->gtype_name || blob->gtype_init)
1166         {
1167           g_set_error (error,
1168                        G_METADATA_ERROR,
1169                        G_METADATA_ERROR_INVALID_BLOB,
1170                        "Gtype data in unregistered enum");
1171           return FALSE;
1172         }
1173     }
1174
1175   if (!is_name (metadata->data, blob->name))
1176     {
1177       g_set_error (error,
1178                    G_METADATA_ERROR,
1179                    G_METADATA_ERROR_INVALID_BLOB,
1180                    "Invalid enum name");
1181       return FALSE;
1182     }
1183
1184   if (metadata->len < offset + sizeof (EnumBlob) +
1185       blob->n_values * sizeof (ValueBlob))
1186     {
1187       g_set_error (error,
1188                    G_METADATA_ERROR,
1189                    G_METADATA_ERROR_INVALID,
1190                    "The buffer is too short");
1191       return FALSE;
1192     }
1193
1194   for (i = 0; i < blob->n_values; i++)
1195     {
1196       if (!validate_value_blob (metadata,
1197                                 offset + sizeof (EnumBlob) +
1198                                 i * sizeof (ValueBlob),
1199                                 error))
1200         return FALSE;
1201
1202       v1 = (ValueBlob *)&metadata->data[offset + sizeof (EnumBlob) +
1203                                         i * sizeof (ValueBlob)];
1204       for (j = 0; j < i; j++)
1205         {
1206           v2 = (ValueBlob *)&metadata->data[offset + sizeof (EnumBlob) +
1207                                             j * sizeof (ValueBlob)];
1208
1209           if (v1->value == v2->value)
1210             {
1211               /* FIXME should this be an error ? */
1212               g_set_error (error,
1213                            G_METADATA_ERROR,
1214                            G_METADATA_ERROR_INVALID_BLOB,
1215                            "Duplicate enum value");
1216               return FALSE;
1217             }
1218         }
1219     }
1220
1221   return TRUE;
1222 }
1223
1224 static gboolean
1225 validate_object_blob (GMetadata     *metadata,
1226                       guint32        offset,
1227                       GError       **error)
1228 {
1229   Header *header;
1230   ObjectBlob *blob;
1231   gint i;
1232   guint32 offset2;
1233
1234   header = (Header *)metadata->data;
1235
1236   if (metadata->len < offset + sizeof (ObjectBlob))
1237     {
1238       g_set_error (error,
1239                    G_METADATA_ERROR,
1240                    G_METADATA_ERROR_INVALID,
1241                    "The buffer is too short");
1242       return FALSE;
1243     }
1244
1245   blob = (ObjectBlob*) &metadata->data[offset];
1246
1247   if (blob->blob_type != BLOB_TYPE_OBJECT)
1248     {
1249       g_set_error (error,
1250                    G_METADATA_ERROR,
1251                    G_METADATA_ERROR_INVALID_BLOB,
1252                    "Wrong blob type");
1253       return FALSE;
1254     }
1255
1256   if (!is_name (metadata->data, blob->gtype_name))
1257     {
1258       g_set_error (error,
1259                    G_METADATA_ERROR,
1260                    G_METADATA_ERROR_INVALID_BLOB,
1261                    "Invalid object type name");
1262       return FALSE;
1263     }
1264
1265   if (!is_name (metadata->data, blob->gtype_init))
1266     {
1267       g_set_error (error,
1268                    G_METADATA_ERROR,
1269                    G_METADATA_ERROR_INVALID_BLOB,
1270                    "Invalid object type init");
1271       return FALSE;
1272     }
1273
1274   if (!is_name (metadata->data, blob->name))
1275     {
1276       g_set_error (error,
1277                    G_METADATA_ERROR,
1278                    G_METADATA_ERROR_INVALID_BLOB,
1279                    "Invalid object name");
1280       return FALSE;
1281     }
1282
1283   if (blob->parent > header->n_entries)
1284     {
1285       g_set_error (error,
1286                    G_METADATA_ERROR,
1287                    G_METADATA_ERROR_INVALID_BLOB,
1288                    "Invalid parent index");
1289       return FALSE;
1290     }
1291
1292   if (blob->parent != 0)
1293     {
1294       DirEntry *entry;
1295
1296       entry = g_metadata_get_dir_entry (metadata, blob->parent);
1297       if (entry->blob_type != BLOB_TYPE_OBJECT &&
1298           (entry->local || entry->blob_type != 0))
1299         {
1300           g_set_error (error,
1301                        G_METADATA_ERROR,
1302                        G_METADATA_ERROR_INVALID_BLOB,
1303                        "Parent not object");
1304           return FALSE;
1305         }
1306     }
1307
1308   if (metadata->len < offset + sizeof (ObjectBlob) +
1309             (blob->n_interfaces + blob->n_interfaces % 2) * 2 +
1310             blob->n_fields * sizeof (FieldBlob) +
1311             blob->n_properties * sizeof (PropertyBlob) +
1312             blob->n_methods * sizeof (FunctionBlob) +
1313             blob->n_signals * sizeof (SignalBlob) +
1314             blob->n_vfuncs * sizeof (VFuncBlob) +
1315             blob->n_constants * sizeof (ConstantBlob))
1316
1317     {
1318       g_set_error (error,
1319                    G_METADATA_ERROR,
1320                    G_METADATA_ERROR_INVALID,
1321                    "The buffer is too short");
1322       return FALSE;
1323     }
1324
1325   offset2 = offset + sizeof (ObjectBlob);
1326
1327   for (i = 0; i < blob->n_interfaces; i++, offset2 += 2)
1328     {
1329       guint16 iface;
1330       DirEntry *entry;
1331
1332       iface = *(guint16*)&metadata->data[offset2];
1333       if (iface == 0 || iface > header->n_entries)
1334         {
1335           g_set_error (error,
1336                        G_METADATA_ERROR,
1337                        G_METADATA_ERROR_INVALID_BLOB,
1338                        "Invalid interface index");
1339           return FALSE;
1340         }
1341
1342       entry = g_metadata_get_dir_entry (metadata, iface);
1343
1344       if (entry->blob_type != BLOB_TYPE_INTERFACE &&
1345           (entry->local || entry->blob_type != 0))
1346         {
1347           g_set_error (error,
1348                        G_METADATA_ERROR,
1349                        G_METADATA_ERROR_INVALID_BLOB,
1350                        "Not an interface");
1351           return FALSE;
1352         }
1353     }
1354
1355   offset2 += 2 * (blob->n_interfaces %2);
1356
1357   for (i = 0; i < blob->n_fields; i++, offset2 += sizeof (FieldBlob))
1358     {
1359       if (!validate_field_blob (metadata, offset2, error))
1360         return FALSE;
1361     }
1362
1363   for (i = 0; i < blob->n_properties; i++, offset2 += sizeof (PropertyBlob))
1364     {
1365       if (!validate_property_blob (metadata, offset2, error))
1366         return FALSE;
1367     }
1368
1369   for (i = 0; i < blob->n_methods; i++, offset2 += sizeof (FunctionBlob))
1370     {
1371       if (!validate_function_blob (metadata, offset2, BLOB_TYPE_OBJECT, error))
1372         return FALSE;
1373     }
1374
1375   for (i = 0; i < blob->n_signals; i++, offset2 += sizeof (SignalBlob))
1376     {
1377       if (!validate_signal_blob (metadata, offset2, offset, error))
1378         return FALSE;
1379     }
1380
1381   for (i = 0; i < blob->n_vfuncs; i++, offset2 += sizeof (VFuncBlob))
1382     {
1383       if (!validate_vfunc_blob (metadata, offset2, offset, error))
1384         return FALSE;
1385     }
1386
1387   for (i = 0; i < blob->n_constants; i++, offset2 += sizeof (ConstantBlob))
1388     {
1389       if (!validate_constant_blob (metadata, offset2, error))
1390         return FALSE;
1391     }
1392
1393   return TRUE;
1394 }
1395
1396 static gboolean
1397 validate_interface_blob (GMetadata     *metadata,
1398                          guint32        offset,
1399                          GError       **error)
1400 {
1401   Header *header;
1402   InterfaceBlob *blob;
1403   gint i;
1404   guint32 offset2;
1405
1406   header = (Header *)metadata->data;
1407
1408   if (metadata->len < offset + sizeof (InterfaceBlob))
1409     {
1410       g_set_error (error,
1411                    G_METADATA_ERROR,
1412                    G_METADATA_ERROR_INVALID,
1413                    "The buffer is too short");
1414       return FALSE;
1415     }
1416
1417   blob = (InterfaceBlob*) &metadata->data[offset];
1418
1419   if (blob->blob_type != BLOB_TYPE_INTERFACE)
1420     {
1421       g_set_error (error,
1422                    G_METADATA_ERROR,
1423                    G_METADATA_ERROR_INVALID_BLOB,
1424                    "Wrong blob type");
1425       return FALSE;
1426     }
1427
1428   if (!is_name (metadata->data, blob->gtype_name))
1429     {
1430       g_set_error (error,
1431                    G_METADATA_ERROR,
1432                    G_METADATA_ERROR_INVALID_BLOB,
1433                    "Invalid interface type name");
1434       return FALSE;
1435     }
1436
1437   if (!is_name (metadata->data, blob->gtype_init))
1438     {
1439       g_set_error (error,
1440                    G_METADATA_ERROR,
1441                    G_METADATA_ERROR_INVALID_BLOB,
1442                    "Invalid interface type init");
1443       return FALSE;
1444     }
1445
1446   if (!is_name (metadata->data, blob->name))
1447     {
1448       g_set_error (error,
1449                    G_METADATA_ERROR,
1450                    G_METADATA_ERROR_INVALID_BLOB,
1451                    "Invalid interface name");
1452       return FALSE;
1453     }
1454
1455   if (metadata->len < offset + sizeof (InterfaceBlob) +
1456             (blob->n_prerequisites + blob->n_prerequisites % 2) * 2 +
1457             blob->n_properties * sizeof (PropertyBlob) +
1458             blob->n_methods * sizeof (FunctionBlob) +
1459             blob->n_signals * sizeof (SignalBlob) +
1460             blob->n_vfuncs * sizeof (VFuncBlob) +
1461             blob->n_constants * sizeof (ConstantBlob))
1462
1463     {
1464       g_set_error (error,
1465                    G_METADATA_ERROR,
1466                    G_METADATA_ERROR_INVALID,
1467                    "The buffer is too short");
1468       return FALSE;
1469     }
1470
1471   offset2 = offset + sizeof (InterfaceBlob);
1472
1473   for (i = 0; i < blob->n_prerequisites; i++, offset2 += 2)
1474     {
1475       DirEntry *entry;
1476       guint16 req;
1477
1478       req = *(guint16*)&metadata->data[offset2];
1479       if (req == 0 || req > header->n_entries)
1480         {
1481           g_set_error (error,
1482                        G_METADATA_ERROR,
1483                        G_METADATA_ERROR_INVALID_BLOB,
1484                        "Invalid prerequisite index");
1485           return FALSE;
1486         }
1487
1488       entry = g_metadata_get_dir_entry (metadata, req);
1489       if (entry->blob_type != BLOB_TYPE_INTERFACE &&
1490           entry->blob_type != BLOB_TYPE_OBJECT &&
1491           (entry->local || entry->blob_type != 0))
1492         {
1493           g_set_error (error,
1494                        G_METADATA_ERROR,
1495                        G_METADATA_ERROR_INVALID_BLOB,
1496                        "Not an interface or object");
1497           return FALSE;
1498         }
1499     }
1500
1501   offset2 += 2 * (blob->n_prerequisites % 2);
1502
1503   for (i = 0; i < blob->n_properties; i++, offset2 += sizeof (PropertyBlob))
1504     {
1505       if (!validate_property_blob (metadata, offset2, error))
1506         return FALSE;
1507     }
1508
1509   for (i = 0; i < blob->n_methods; i++, offset2 += sizeof (FunctionBlob))
1510     {
1511       if (!validate_function_blob (metadata, offset2, BLOB_TYPE_INTERFACE, error))
1512         return FALSE;
1513     }
1514
1515   for (i = 0; i < blob->n_signals; i++, offset2 += sizeof (SignalBlob))
1516     {
1517       if (!validate_signal_blob (metadata, offset2, offset, error))
1518         return FALSE;
1519     }
1520
1521   for (i = 0; i < blob->n_vfuncs; i++, offset2 += sizeof (VFuncBlob))
1522     {
1523       if (!validate_vfunc_blob (metadata, offset2, offset, error))
1524         return FALSE;
1525     }
1526
1527   for (i = 0; i < blob->n_constants; i++, offset2 += sizeof (ConstantBlob))
1528     {
1529       if (!validate_constant_blob (metadata, offset2, error))
1530         return FALSE;
1531     }
1532
1533   return TRUE;
1534 }
1535
1536 static gboolean
1537 validate_errordomain_blob (GMetadata     *metadata,
1538                            guint32        offset,
1539                            GError       **error)
1540 {
1541   return TRUE;
1542 }
1543
1544 static gboolean
1545 validate_union_blob (GMetadata     *metadata,
1546                      guint32        offset,
1547                      GError       **error)
1548 {
1549   return TRUE;
1550 }
1551
1552 static gboolean
1553 validate_blob (GMetadata     *metadata,
1554                guint32        offset,
1555                GError       **error)
1556 {
1557   CommonBlob *common;
1558
1559   if (metadata->len < offset + sizeof (CommonBlob))
1560     {
1561       g_set_error (error,
1562                    G_METADATA_ERROR,
1563                    G_METADATA_ERROR_INVALID,
1564                    "The buffer is too short");
1565       return FALSE;
1566     }
1567
1568   common = (CommonBlob*)&metadata->data[offset];
1569
1570   switch (common->blob_type)
1571     {
1572     case BLOB_TYPE_FUNCTION:
1573       if (!validate_function_blob (metadata, offset, 0, error))
1574         return FALSE;
1575       break;
1576     case BLOB_TYPE_CALLBACK:
1577       if (!validate_callback_blob (metadata, offset, error))
1578         return FALSE;
1579       break;
1580     case BLOB_TYPE_STRUCT:
1581     case BLOB_TYPE_BOXED:
1582       if (!validate_struct_blob (metadata, offset, common->blob_type, error))
1583         return FALSE;
1584       break;
1585     case BLOB_TYPE_ENUM:
1586     case BLOB_TYPE_FLAGS:
1587       if (!validate_enum_blob (metadata, offset, common->blob_type, error))
1588         return FALSE;
1589       break;
1590     case BLOB_TYPE_OBJECT:
1591       if (!validate_object_blob (metadata, offset, error))
1592         return FALSE;
1593       break;
1594     case BLOB_TYPE_INTERFACE:
1595       if (!validate_interface_blob (metadata, offset, error))
1596         return FALSE;
1597       break;
1598     case BLOB_TYPE_CONSTANT:
1599       if (!validate_constant_blob (metadata, offset, error))
1600         return FALSE;
1601       break;
1602     case BLOB_TYPE_ERROR_DOMAIN:
1603       if (!validate_errordomain_blob (metadata, offset, error))
1604         return FALSE;
1605       break;
1606     case BLOB_TYPE_UNION:
1607       if (!validate_union_blob (metadata, offset, error))
1608         return FALSE;
1609       break;
1610     default:
1611       g_set_error (error,
1612                    G_METADATA_ERROR,
1613                    G_METADATA_ERROR_INVALID_ENTRY,
1614                    "Invalid blob type");
1615       return FALSE;
1616     }
1617
1618   return TRUE;
1619 }
1620
1621 static gboolean
1622 validate_directory (GMetadata     *metadata,
1623                     GError       **error)
1624 {
1625   Header *header = (Header *)metadata->data;
1626   DirEntry *entry;
1627   gint i;
1628
1629   if (metadata->len < header->directory + header->n_entries * sizeof (DirEntry))
1630     {
1631       g_set_error (error,
1632                    G_METADATA_ERROR,
1633                    G_METADATA_ERROR_INVALID,
1634                    "The buffer is too short");
1635       return FALSE;
1636     }
1637
1638   for (i = 0; i < header->n_entries; i++)
1639     {
1640       entry = g_metadata_get_dir_entry (metadata, i + 1);
1641
1642       if (!is_name (metadata->data, entry->name))
1643         {
1644           g_set_error (error,
1645                        G_METADATA_ERROR,
1646                        G_METADATA_ERROR_INVALID_DIRECTORY,
1647                        "Invalid entry name");
1648           return FALSE;
1649         }
1650
1651       if ((entry->local && entry->blob_type == BLOB_TYPE_INVALID) ||
1652           entry->blob_type > BLOB_TYPE_UNION)
1653         {
1654           g_set_error (error,
1655                        G_METADATA_ERROR,
1656                        G_METADATA_ERROR_INVALID_DIRECTORY,
1657                        "Invalid entry type");
1658           return FALSE;
1659         }
1660
1661       if (i < header->n_local_entries)
1662         {
1663           if (!entry->local)
1664             {
1665               g_set_error (error,
1666                            G_METADATA_ERROR,
1667                            G_METADATA_ERROR_INVALID_DIRECTORY,
1668                            "Too few local directory entries");
1669               return FALSE;
1670             }
1671
1672           if (!is_aligned (entry->offset))
1673             {
1674               g_set_error (error,
1675                            G_METADATA_ERROR,
1676                            G_METADATA_ERROR_INVALID_DIRECTORY,
1677                            "Misaligned entry");
1678               return FALSE;
1679             }
1680
1681           if (!validate_blob (metadata, entry->offset, error))
1682             return FALSE;
1683         }
1684       else
1685         {
1686           if (entry->local)
1687             {
1688               g_set_error (error,
1689                            G_METADATA_ERROR,
1690                            G_METADATA_ERROR_INVALID_DIRECTORY,
1691                            "Too many local directory entries");
1692               return FALSE;
1693             }
1694
1695           if (!is_name (metadata->data, entry->offset))
1696             {
1697               g_set_error (error,
1698                            G_METADATA_ERROR,
1699                            G_METADATA_ERROR_INVALID_DIRECTORY,
1700                            "Invalid namespace name");
1701               return FALSE;
1702             }
1703         }
1704     }
1705
1706   return TRUE;
1707 }
1708
1709 static gboolean
1710 validate_annotations (GMetadata     *metadata,
1711                       GError       **error)
1712 {
1713   Header *header = (Header *)metadata->data;
1714
1715   if (header->size < header->annotations + header->n_annotations * sizeof (AnnotationBlob))
1716     {
1717       g_set_error (error,
1718                    G_METADATA_ERROR,
1719                    G_METADATA_ERROR_INVALID,
1720                    "The buffer is too short");
1721       return FALSE;
1722     }
1723
1724   return TRUE;
1725 }
1726
1727 gboolean
1728 g_metadata_validate (GMetadata     *metadata,
1729                      GError       **error)
1730 {
1731   if (!validate_header (metadata, error))
1732     return FALSE;
1733
1734   if (!validate_directory (metadata, error))
1735     return FALSE;
1736
1737   if (!validate_annotations (metadata, error))
1738     return FALSE;
1739
1740   return TRUE;
1741 }
1742
1743 GQuark
1744 g_metadata_error_quark (void)
1745 {
1746   static GQuark quark = 0;
1747   if (quark == 0)
1748     quark = g_quark_from_static_string ("g-metadata-error-quark");
1749   return quark;
1750 }
1751
1752
1753 static inline void
1754 _g_metadata_init (GMetadata *metadata)
1755 {
1756   Header *header;
1757
1758   header = (Header *) metadata->data;
1759   if (header->shared_library)
1760     {
1761       const gchar *shlib;
1762       shlib = g_metadata_get_string (metadata, header->shared_library);
1763       metadata->module = g_module_open (shlib, G_MODULE_BIND_LAZY|G_MODULE_BIND_LOCAL);
1764       if (metadata->module == NULL)
1765         g_warning ("Failed to load shared library referenced by the metadata: %s",
1766                    g_module_error ());
1767     }
1768 }
1769
1770 /**
1771  * g_metadata_new_from_memory:
1772  * @memory: address of memory chunk containing the metadata
1773  * @len: length of memory chunk containing the metadata
1774  *
1775  * Creates a new #GMetadata from a memory location.  The memory block
1776  * pointed to by @metadata will be automatically g_free()d when the
1777  * repository is destroyed.
1778  *
1779  * Return value: the new #GMetadata
1780  **/
1781 GMetadata *
1782 g_metadata_new_from_memory (guchar *memory, gsize len)
1783 {
1784   GMetadata *meta;
1785
1786   meta = g_new0 (GMetadata, 1);
1787   meta->data = memory;
1788   meta->len = len;
1789   meta->owns_memory = TRUE;
1790   _g_metadata_init (meta);
1791   return meta;
1792 }
1793
1794 /**
1795  * g_metadata_new_from_const_memory:
1796  * @memory: address of memory chunk containing the metadata
1797  * @len: length of memory chunk containing the metadata
1798  *
1799  * Creates a new #GMetadata from a memory location.
1800  *
1801  * Return value: the new #GMetadata
1802  **/
1803 GMetadata *
1804 g_metadata_new_from_const_memory (const guchar *memory, gsize len)
1805 {
1806   GMetadata *meta;
1807
1808   meta = g_new0 (GMetadata, 1);
1809   meta->data = (guchar *) memory;
1810   meta->len = len;
1811   meta->owns_memory = FALSE;
1812   _g_metadata_init (meta);
1813   return meta;
1814 }
1815
1816 /**
1817  * g_metadata_new_from_mapped_file:
1818  * @mfile: a #GMappedFile, that will be free'd when the repository is destroyed
1819  *
1820  * Creates a new #GMetadata from a #GMappedFile.
1821  *
1822  * Return value: the new #GMetadata
1823  **/
1824 GMetadata *
1825 g_metadata_new_from_mapped_file (GMappedFile *mfile)
1826 {
1827   GMetadata *meta;
1828
1829   meta = g_new0 (GMetadata, 1);
1830   meta->mfile = mfile;
1831   meta->owns_memory = FALSE;
1832   meta->data = (guchar *) g_mapped_file_get_contents (mfile);
1833   meta->len = g_mapped_file_get_length (mfile);
1834   _g_metadata_init (meta);
1835   return meta;
1836 }
1837
1838 /**
1839  * g_metadata_free:
1840  * @metadata: a #GMetadata
1841  *
1842  * Free a #GMetadata.
1843  **/
1844 void
1845 g_metadata_free (GMetadata *metadata)
1846 {
1847   if (metadata->mfile)
1848     g_mapped_file_unref (metadata->mfile);
1849   else
1850     if (metadata->owns_memory)
1851       g_free (metadata->data);
1852   if (metadata->module)
1853     g_module_close (metadata->module);
1854   g_free (metadata);
1855 }
1856
1857 /**
1858  * g_metadata_set_module:
1859  * @metadata: a #GMetadata instance
1860  * @module: a #GModule; takes ownership of this module
1861  *
1862  * Sets the target module for all symbols referenced by the metadata.
1863  **/
1864 void
1865 g_metadata_set_module (GMetadata *metadata, GModule *module)
1866 {
1867   if (metadata->module)
1868     g_module_close (metadata->module);
1869   metadata->module = module;
1870 }
1871
1872 const gchar *
1873 g_metadata_get_namespace(GMetadata *metadata)
1874 {
1875   return g_metadata_get_string (metadata, ((Header *) metadata->data)->namespace);
1876 }