Source

pyobjc / Modules / objc / objc_support.m

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
/* Copyright (c) 1996,97,98 by Lele Gaifax.  All Rights Reserved
 * Copyright (c) 2002, 2003 Ronald Oussoren
 *
 * This software may be used and distributed freely for any purpose
 * provided that this notice is included unchanged on any and all
 * copies. The author does not warrant or guarantee this software in
 * any way.
 *
 * This file is part of the PyObjC package.
 *
 * RCSfile: objc_support.m,v
 * Revision: 1.24
 * Date: 1998/08/18 15:35:58
 *
 * Created Tue Sep 10 14:16:02 1996.
 */

#include "pyobjc.h"
#include <objc/Protocol.h>

#include <unistd.h>


#ifdef MACOSX
/* OSX 10.1 doesn't define LLONG_MIN, LLONG_MAX and ULLONG_MAX */
#ifndef LLONG_MIN
#error "Mac OS X 10.1 not supported"
#endif
#endif

#import <Foundation/NSInvocation.h>
#import <Foundation/NSData.h> 
#import <Foundation/NSValue.h> 
#import <Foundation/NSDecimalNumber.h> 

#ifdef MACOSX
#include <CoreFoundation/CFNumber.h>
#endif /* MACOSX */

/*
 * Category on NSObject to make sure that every object supports 
 * the method  __pyobjc_PythonObject__, this helps to simplify
 * pythonify_c_value.
 */
@interface NSObject (PyObjCSupport)
-(PyObject*)__pyobjc_PythonObject__;
+(PyObject*)__pyobjc_PythonObject__;
@end /* PyObjCSupport */

@implementation NSObject (PyObjCSupport)

-(PyObject*)__pyobjc_PythonObject__
{
	PyObject *rval;

	rval = PyObjC_FindPythonProxy(self);
	if (rval == NULL) {
		rval = (PyObject *)PyObjCObject_New(self);
		PyObjC_RegisterPythonProxy(self, rval);
	}

	return rval;
}

+(PyObject*)__pyobjc_PythonObject__
{
	PyObject *rval;

	//rval = PyObjC_FindPythonProxy(self);
	rval = NULL;
	if (rval == NULL) {
		rval = (PyObject *)PyObjCClass_New(self);
		//PyObjC_RegisterPythonProxy(self, rval);
	}

	return rval;
}

@end /* PyObjCSupport */

@interface NSProxy (PyObjCSupport)
-(PyObject*)__pyobjc_PythonObject__;
+(PyObject*)__pyobjc_PythonObject__;
@end /* PyObjCSupport */

@implementation NSProxy (PyObjCSupport)

-(PyObject*)__pyobjc_PythonObject__
{
	PyObject *rval;

	rval = PyObjC_FindPythonProxy(self);
	if (rval == NULL) {
		rval = (PyObject *)PyObjCObject_New(self);
		PyObjC_RegisterPythonProxy(self, rval);
	}
	return rval;
}

+(PyObject*)__pyobjc_PythonObject__
{
	PyObject *rval;

	rval = NULL;
	//rval = PyObjC_FindPythonProxy(self);
	if (rval == NULL) {
		rval = (PyObject *)PyObjCClass_New(self);
		//PyObjC_RegisterPythonProxy(self, rval);
	}
	return rval;
}

@end /* PyObjCSupport */

@interface Protocol (PyObjCSupport)
-(PyObject*)__pyobjc_PythonObject__;
@end /* PyObjCSupport */

@implementation Protocol (PyObjCSupport)

-(PyObject*)__pyobjc_PythonObject__
{
	PyObject *rval;

	rval = PyObjC_FindPythonProxy(self);
	if (rval == NULL) {
		rval = PyObjCFormalProtocol_ForProtocol(self);
	}
	return rval;
}

@end /* PyObjCSupport */

@interface Object (PyObjCSupport)
-(PyObject*)__pyobjc_PythonObject__;
@end /* PyObjCSupport */

@implementation Object (PyObjCSupport)

-(PyObject*)__pyobjc_PythonObject__
{
	PyObject *rval;

	rval = PyObjC_FindPythonProxy(self);
	if (rval == NULL) {
		rval = (PyObject *)PyObjCObject_NewClassic(self);
		PyObjC_RegisterPythonProxy(self, rval);
	}
	return rval;
}

@end /* PyObjCSupport */

@interface NSString (PyObjCSupport)
-(PyObject*)__pyobjc_PythonObject__;
@end /* NSString (PyObjCSupport) */

@implementation NSString (PyObjCSupport)

-(PyObject*)__pyobjc_PythonObject__
{
	/* Don't register the proxy, see XXX */
	PyObject *rval = (PyObject *)PyObjCUnicode_New(self);
	return rval;
}

@end /* NSString (PyObjCSupport) */

@interface NSNumber (PyObjCSupport)
-(PyObject*)__pyobjc_PythonObject__;
@end /* NSNumber (PyObjCSupport) */

@implementation NSNumber (PyObjCSupport)
-(PyObject*)__pyobjc_PythonObject__
{
	/* FIXME: rewrite PyObjC_NSNumberWrapper in C */
	PyObject *rval;


#ifdef MACOSX
	/* shortcut for booleans */
	if (kCFBooleanTrue == (CFBooleanRef)self) {
		return PyBool_FromLong(1);
	} else if (kCFBooleanFalse == (CFBooleanRef)self) {
		return PyBool_FromLong(0);
	}
#endif
	
	rval = PyObjC_FindPythonProxy(self);
	if (rval == NULL) {
		rval= PyObjCObject_New(self);

		if (PyObjC_NSNumberWrapper && rval) {
			PyObject *val = rval;
			rval = PyObject_CallFunctionObjArgs(
					PyObjC_NSNumberWrapper, val, NULL);
			Py_DECREF(val);
		}
	}
	return rval;
}
@end

@interface NSDecimalNumber (PyObjCSupport)
-(PyObject*)__pyobjc_PythonObject__;
@end /* NSDecimalNumber (PyObjCSupport) */

@implementation NSDecimalNumber (PyObjCSupport)
-(PyObject*)__pyobjc_PythonObject__
{
	PyObject *rval;

	rval = PyObjC_FindPythonProxy(self);
	if (rval == NULL) {
		rval = (PyObject *)PyObjCObject_New(self);
		PyObjC_RegisterPythonProxy(self, rval);
	}

	return rval;
}
@end

#ifndef MAX
static inline int
MAX(int x, int y)
{
	return x > y ? x : y;
}
#endif

#if 0
static inline int
ROUND(int v, int a)
{
	return a * ((v+a-1)/a);
}
#else
static inline int 
ROUND(int v, int a)
{
	if (v % a == 0) {
		return v;
	} else {
		return v + a - (v % a);
	}
}
#endif


static inline const char*
PyObjCRT_SkipTypeQualifiers (const char* type)
{
	while (
			*type == _C_CONST ||
			*type == _C_IN ||
			*type == _C_INOUT ||
			*type == _C_OUT ||
			*type == _C_BYCOPY ||
			*type == _C_ONEWAY) {
		type++;
	}
	while (*type && isdigit(*type)) type++;
	return type;
}


const char * 
PyObjCRT_SkipTypeSpec (const char *type)
{
	type = PyObjCRT_SkipTypeQualifiers (type);

	switch (*type) {
	/* The following are one character type codes */
	case _C_UNDEF:
	case _C_ID:
	case _C_CLASS:
	case _C_SEL:
	case _C_CHR:
	case _C_UCHR:
	case _C_CHARPTR:
#ifdef _C_ATOM
	case _C_ATOM:
#endif
#ifdef _C_BOOL
	case _C_BOOL:
#endif
	case _C_SHT:
	case _C_USHT:
	case _C_INT:
	case _C_UINT:
	case _C_LNG:
	case _C_ULNG:
	case _C_FLT:
	case _C_DBL:
	case _C_VOID:
	case _C_LNGLNG:
	case _C_ULNGLNG:
	case _C_BFLD: /* Not really 1 character, but close enough  */
		++type;
		break;

	case _C_ARY_B:
		/* skip digits, typespec and closing ']' */

		while (isdigit (*++type));
		type = PyObjCRT_SkipTypeSpec (type);
		assert (type == NULL || *type == _C_ARY_E);
		if (type) type++;
		break;
  
	case _C_STRUCT_B:
		/* skip name, and elements until closing '}'  */
		while (*type != _C_STRUCT_E && *type++ != '='); 
		while (type && *type != _C_STRUCT_E)
			type = PyObjCRT_SkipTypeSpec (type);
		if (type) type++;
		break;

	case _C_UNION_B:
		/* skip name, and elements until closing ')'  */
		while (*type != _C_UNION_E && *type++ != '='); 
		while (type && *type != _C_UNION_E) { 
			type = PyObjCRT_SkipTypeSpec (type); 
		}
		if (type) type++;
		break;
  
	case _C_PTR:
	case _C_CONST:
	case _C_IN:
	case _C_INOUT:
	case _C_OUT:
	case _C_BYCOPY:
	case _C_ONEWAY:

		/* Just skip the following typespec */
		type = PyObjCRT_SkipTypeSpec (type+1);
		break;


	default:
		PyErr_Format(PyObjCExc_InternalError,
			"PyObjCRT_SkipTypeSpec: Unhandled type '%#x'", *type); 
		return NULL;
	}

	/* The compiler inserts a number after the actual signature, 
	 * this number may or may not be usefull depending on the compiler
	 * version. We never use it.
	 */
	while (type && *type && isdigit(*type)) type++;
	return type;
}

/*
Return the alignment of an object specified by type 
*/

/*
*  On MacOS X, the elements of a struct are aligned differently inside the
*  struct than outside. That is, the maximum alignment of any struct field
*  (except the first) is 4, doubles outside of a struct have an alignment of
*  8.
*
*  Other platform don't seem to have this inconsistency.
*  
*  XXX: sizeof_struct, alignof_struct and {de,}pythonify_c_struct should
*  probably be moved to platform dependend files. As long as this is the
*  only platform dependent code this isn't worth the effort.
*/
#ifdef MACOSX

static inline int
PyObjC_EmbeddedAlignOfType (const char*  type)
{
	int align = PyObjCRT_AlignOfType(type);

	if (align < 4) {
		return align;
	} else {
		return 4;
	}
}

#else

static inline int
PyObjC_EmbeddedAlignOfType (const char*  type)
{
	int align =  PyObjCRT_AlignOfType(type);

	/* GNUstep/ix86 seems to behave like this: */
	if (align < 4) {
		return align;
	} else {
		return 4;
	}
}

#endif

int
PyObjCRT_AlignOfType (const char *type)
{
	switch (*type) {
	case _C_ID:    return __alignof__ (id);
	case _C_CLASS: return __alignof__ (Class);
	case _C_SEL:   return __alignof__ (SEL);
	case _C_CHR:   return __alignof__ (char);
	case _C_UCHR:  return __alignof__ (unsigned char);
	case _C_SHT:   return __alignof__ (short);
	case _C_USHT:  return __alignof__ (unsigned short);
#ifdef _C_BOOL
	case _C_BOOL:   return __alignof__ (bool);
#endif
	case _C_INT:   return __alignof__ (int);
	case _C_UINT:  return __alignof__ (unsigned int);
	case _C_LNG:   return __alignof__ (long);
	case _C_ULNG:  return __alignof__ (unsigned long);
	case _C_FLT:   return __alignof__ (float);
	case _C_DBL:   return __alignof__ (double);
	case _C_CHARPTR: return __alignof__ (char *);
#ifdef _C_ATOM
	case _C_ATOM: return __alignof__ (char *);
#endif
	case _C_PTR:   return __alignof__ (void *);
	case _C_LNGLNG: return __alignof__(long long);
	case _C_ULNGLNG: return __alignof__(unsigned long long);

	case _C_ARY_B:
		while (isdigit(*++type)) /* do nothing */;
		return PyObjCRT_AlignOfType (type);
  
	case _C_STRUCT_B:
	{
		/* The alignment of a struct is the alignment of it's first
		 * member
		 */

		struct { int x; double y; } fooalign;
		while(*type != _C_STRUCT_E && *type++ != '=') /* do nothing */;
		if (*type != _C_STRUCT_E) {
			int have_align = 0;
			int align = 0;

			while (type != NULL && *type != _C_STRUCT_E) {
				if (have_align) {
					align = MAX(align, 
					   PyObjC_EmbeddedAlignOfType(type));
				} else {
					align = PyObjCRT_AlignOfType(type);
					have_align = 1;
				}
				type = PyObjCRT_SkipTypeSpec(type);
			}
			if (type == NULL) return -1;
			return align;
		} else {
			return __alignof__ (fooalign);
		}
	}

	case _C_UNION_B:
	{
		int maxalign = 0;
		type++;
		while (*type != _C_UNION_E)
		{
			int item_align = PyObjCRT_AlignOfType(type);
			if (item_align == -1) return -1;
			maxalign = MAX (maxalign, item_align);
			type = PyObjCRT_SkipTypeSpec (type);
		}
		return maxalign;
	}

	case _C_CONST:
	case _C_IN:
	case _C_INOUT:
	case _C_OUT:
	case _C_BYCOPY:
	case _C_ONEWAY:
		return PyObjCRT_AlignOfType(type+1);

	default:
		PyErr_Format(PyObjCExc_InternalError, 
			"PyObjCRT_AlignOfType: Unhandled type '%#x'", *type);
		return -1;
	}
}

/*
The aligned size if the size rounded up to the nearest alignment.
*/

static int
PyObjCRT_AlignedSize (const char *type)
{
	int size = PyObjCRT_SizeOfType (type);
	int align = PyObjCRT_AlignOfType (type);

	if (size == -1 || align == -1) return -1;
	return ROUND (size, align);
}

/*
return the size of an object specified by type 
*/

int
PyObjCRT_SizeOfType (const char *type)
{
	int itemSize;
	switch (*type) {
	case _C_VOID:    return 0;
	case _C_ID:      return sizeof(id);
	case _C_CLASS:   return sizeof(Class);
	case _C_SEL:     return sizeof(SEL);
	case _C_CHR:     return sizeof(char);
	case _C_UCHR:    return sizeof(unsigned char);
	case _C_SHT:     return sizeof(short);
	case _C_USHT:    return sizeof(unsigned short);
#ifdef _C_BOOL
	case _C_BOOL:    return sizeof(bool);
#endif
	case _C_INT:     return sizeof(int);
	case _C_UINT:    return sizeof(unsigned int);
	case _C_LNG:     return sizeof(long);
	case _C_ULNG:    return sizeof(unsigned long);
	case _C_FLT:     return sizeof(float);
	case _C_DBL:     return sizeof(double);
	case _C_LNGLNG:  return sizeof(long long);
	case _C_ULNGLNG: return sizeof(unsigned long long);

	case _C_PTR:
	case _C_CHARPTR:
#ifdef _C_ATOM
	case _C_ATOM:
#endif
		return sizeof(char*);
  
	case _C_ARY_B:
	{
		int len = atoi(type+1);
		int item_align;
		while (isdigit(*++type))
			;
		item_align = PyObjCRT_AlignedSize(type);
		if (item_align == -1) return -1;
		return len*item_align;
	}
	break; 

	case _C_STRUCT_B:
	{
		int acc_size = 0;
		int have_align =  0;
		int align;
		int max_align = 0;

		while (*type != _C_STRUCT_E && *type++ != '=')
			; /* skip "<name>=" */
		while (*type != _C_STRUCT_E) {
			if (have_align) {
				align = PyObjC_EmbeddedAlignOfType(type);
				if (align == -1) return -1;
			} else {
				align = PyObjCRT_AlignOfType(type);
				if (align == -1) return -1;
				have_align = 1;
			}
			max_align = MAX(align, max_align);
			acc_size = ROUND (acc_size, align);

			itemSize = PyObjCRT_SizeOfType (type); 
			if (itemSize == -1) return -1;
			acc_size += itemSize;
			type = PyObjCRT_SkipTypeSpec (type);
		}
		if (max_align) {
			acc_size = ROUND(acc_size, max_align);
		}
		return acc_size;
	}

	case _C_UNION_B:
	{
		int max_size = 0;
		type++;
		while (*type != _C_UNION_E) {
			itemSize = PyObjCRT_SizeOfType (type);
			if (itemSize == -1) return -1;
			max_size = MAX (max_size, itemSize);
			type = PyObjCRT_SkipTypeSpec (type);
		}
		return max_size;
	}

	case _C_CONST:
	case _C_IN:
	case _C_INOUT:
	case _C_OUT:
	case _C_BYCOPY:
	case _C_ONEWAY:
		return PyObjCRT_SizeOfType(type+1);

	default:
		PyErr_Format(PyObjCExc_InternalError, 
			"PyObjCRT_SizeOfType: Unhandled type '%#x", *type);
		return -1;
	}
}


/*#F Returns a tuple of objects representing the content of a C array
of type @var{type} pointed by @var{datum}. */
static PyObject *
pythonify_c_array (const char *type, void *datum)
{
	PyObject *ret;
	int nitems, itemidx, sizeofitem;
	unsigned char* curdatum;

	nitems = atoi (type+1);
	while (isdigit (*++type))
		;
	sizeofitem = PyObjCRT_SizeOfType (type);
	if (sizeofitem == -1) return NULL;

	ret = PyTuple_New (nitems);
	if (!ret) return NULL;

	curdatum = datum;
	for (itemidx=0; itemidx < nitems; itemidx++) {
		PyObject *pyitem = NULL;

		pyitem = pythonify_c_value (type, curdatum);

		if (pyitem) {
			PyTuple_SET_ITEM (ret, itemidx, pyitem);
		} else {
			Py_DECREF(ret);
			return NULL;
		}

		curdatum += sizeofitem;
	}

	return ret;
}

/*#F Returns a tuple of objects representing the content of a C structure
of type @var{type} pointed by @var{datum}. */
static PyObject *
pythonify_c_struct (const char *type, void *datum)
{
	PyObject *ret;
	PyObject *converted;
	unsigned int offset, itemidx;
	const char *item;
	int have_align = 0, align;
	int haveTuple;
	const char* type_start = type;
	const char* type_end = PyObjCRT_SkipTypeSpec(type);

	const char* type_real_start = type;
	int type_real_length = type_end - type_start;

	/* The compiler adds useless digits at the end of the signature */
	while (type_end != type_start+1 && type_end[-1] != _C_STRUCT_E) {
		type_end--;
	}

	while (*type != _C_STRUCT_E && *type++ != '=') {
		/* skip "<name>=" */
	}

	haveTuple = 0;
	ret = PyObjC_CreateRegisteredStruct(type_start, type_end-type_start);
	if (ret == NULL) {
		int nitems;

		for (item=type, nitems=0; 
				*item != _C_STRUCT_E; 
				item = PyObjCRT_SkipTypeSpec (item)){
			nitems++;
		}

		haveTuple = 1;
		ret = PyTuple_New (nitems);
		if (!ret) return NULL;
	}

	for (item=type, offset=itemidx=0; 
			*item != _C_STRUCT_E; 
			item = PyObjCRT_SkipTypeSpec (item)) {
		PyObject *pyitem;

		if (!have_align) {
			align = PyObjCRT_AlignOfType(item);
			have_align = 1;
		} else {
			align = PyObjC_EmbeddedAlignOfType(item);
		}

		offset = ROUND(offset, align);

		pyitem = pythonify_c_value (item, ((char*)datum)+offset);

		if (pyitem) {
			if (haveTuple) {
				PyTuple_SET_ITEM (ret, itemidx, pyitem);
			} else {
				int r;
				r = PySequence_SetItem(ret, itemidx, pyitem);
				Py_DECREF(pyitem);
				if (r == -1) {
					Py_DECREF(ret);
					return NULL;
				}
			}
		} else {
			Py_DECREF(ret);
			return NULL;
		}

		itemidx++;
		offset += PyObjCRT_SizeOfType (item);
	}

	converted = [OC_PythonObject __pythonifyStruct:ret withType:type_real_start length:type_real_length];
	Py_DECREF(ret);
	return converted;
}

/*#F Extracts the elements from the tuple @var{arg} and fills a C array
of type @var{type} pointed by @var{datum}. Returns an error message, or
NULL on success. */
static int
depythonify_c_array (const char *type, PyObject *arg, void *datum)
{
	int nitems, itemidx, sizeofitem;
	unsigned char* curdatum;
	PyObject* seq;

	nitems = atoi (type+1);
	while (isdigit (*++type))
		;
	sizeofitem = PyObjCRT_AlignedSize (type);
	if (sizeofitem == -1) {
		PyErr_Format(PyExc_ValueError, 
			"cannot depythonify array of unknown type");
		return -1;
	}

	seq = PySequence_Fast(arg, "depythonifying array, got no sequence");
	if (seq == NULL) {
		return -1;
	}

	if (nitems != PySequence_Fast_GET_SIZE(seq)) {
		Py_DECREF(seq);
		PyErr_Format(PyExc_ValueError,
			"depythonifying array of %d items, got one of %d",
			nitems, PyTuple_Size(arg));
		return -1;
	}

	curdatum = datum;
	for (itemidx=0; itemidx < nitems; itemidx++) {
		PyObject *pyarg = PySequence_Fast_GET_ITEM(seq, itemidx);
		int err;

		err = depythonify_c_value (type, pyarg, curdatum);
		if (err == -1) {
			Py_DECREF(seq);
			return err;
		}
	  
		curdatum += sizeofitem;
	}

	Py_DECREF(seq);
	return 0;
}

/*#F Extracts the elements from the tuple @var{arg} and fills a C structure
of type @var{type} pointed by @var{datum}. Returns an error message, or
NULL on success. */
static int
depythonify_c_struct(const char *types, PyObject *arg, void *datum)
{
	int nitems, offset, itemidx;
	int have_align = 0, align;
	const char *type;
	PyObject* seq;

	while (*types != _C_STRUCT_E && *types++ != '='); /* skip "<name>=" */
	for (type=types, nitems=0; 
		*type != _C_STRUCT_E; 
		type = PyObjCRT_SkipTypeSpec (type)){

		nitems++;
	}

	seq = PySequence_Fast(arg, "depythonifying struct, got no sequence");
	if (seq == NULL) {
		return -1;
	}

	if (nitems != PySequence_Fast_GET_SIZE(seq)) {
		Py_DECREF(seq);
		PyErr_Format(PyExc_ValueError,
			"depythonifying struct of %d members, got tuple of %d",
			nitems, PyTuple_Size (arg));
		return -1;
	}

	for (type=types, offset=itemidx=0; 
		*type != _C_STRUCT_E; 
		type = PyObjCRT_SkipTypeSpec (type)){

		PyObject *argument = PySequence_Fast_GET_ITEM(seq, itemidx);
		int error;
		if (!have_align) {
			align = PyObjCRT_AlignOfType(type);
			have_align = 1;
		} else {
			align = PyObjC_EmbeddedAlignOfType(type);
		}

		offset = ROUND(offset, align);

		error = depythonify_c_value(type, argument, 
				((char*)datum)+offset);
		if (error == -1) {
			Py_DECREF(seq);
			return error;
		}
  
		itemidx++;
		offset += PyObjCRT_SizeOfType (type);
	}
	Py_DECREF(seq);
	return 0;
}

PyObject *
pythonify_c_value (const char *type, void *datum)
{
	PyObject *retobject = NULL;

	type = PyObjCRT_SkipTypeQualifiers (type);

	switch (*type) {
	case _C_CHR:
		/* 
		 * We don't return a string because BOOL is an alias for
		 * char (at least on MacOS X)
		 */
		retobject = (PyObject*)PyInt_FromLong ((int)(*(char*)datum));
		break;

	case _C_UCHR:
		retobject = (PyObject*)PyInt_FromLong (
			(long)(*(unsigned char*)datum));
		break;

	case _C_CHARPTR: 
#ifdef _C_ATOM
	case _C_ATOM:
#endif
	{
		char *cp = *(char **) datum;

		if (cp == NULL) {
			Py_INCREF(Py_None);
			retobject = Py_None;
		} else {
			retobject = (PyObject*)PyString_FromString(cp);
		}
		break;
	}

#ifdef _C_BOOL
	case _C_BOOL:
		retobject = (PyObject *) PyInt_FromLong (*(bool*) datum);
		break;
#endif

	case _C_INT:
		retobject = (PyObject *) PyInt_FromLong (*(int*) datum);
		break;

	case _C_UINT:
		if (*(unsigned int*)datum > LONG_MAX) {
			retobject = (PyObject*)PyLong_FromUnsignedLongLong(
				*(unsigned int*)datum);
		} else {
			retobject = (PyObject*)PyInt_FromLong (
				*(unsigned int *) datum);
		}
		break;

	case _C_SHT:
		retobject = (PyObject *) PyInt_FromLong (*(short *) datum);
		break;

	case _C_USHT:
		retobject = (PyObject *) PyInt_FromLong (
			*(unsigned short *) datum);
		break;

	case _C_LNG:
		retobject = (PyObject *) PyInt_FromLong (*(long *) datum);
		break;

	case _C_ULNG:
		if (*(unsigned long*)datum > LONG_MAX) {
			retobject = (PyObject*)PyLong_FromUnsignedLongLong(
				*(unsigned long*)datum);
		} else {
			retobject = (PyObject*)PyInt_FromLong (
				*(unsigned long*) datum);
		}
		break;

	case _C_ULNGLNG:
		retobject = (PyObject*)PyLong_FromUnsignedLongLong(
			*(unsigned long long*)datum);
		break;

	case _C_LNGLNG: 
		retobject = (PyObject*)PyLong_FromLongLong(*(long long*)datum);
		break;

	case _C_FLT:
		retobject = (PyObject *) PyFloat_FromDouble (*(float*) datum);
		break;

	case _C_DBL:
		retobject = (PyObject *) PyFloat_FromDouble (*(double*) datum);
		break;
  
	case _C_ID:
	{
		id obj = *(id *) datum;

#if 1
		/* In theory this is a no-op, in practice this gives us EOF 4.5 
		 * support.
		 *
		 * EOF can return references to 'to-be-restored' objects, 
		 * calling any method on them fully restores them, 'self' is
		 * the safest method to call.
		 */
		obj = [obj self];
#endif

		if (obj == nil) {
			retobject = Py_None;
			Py_INCREF (retobject);
		} else {
			retobject = [obj  __pyobjc_PythonObject__];
		}
		break;
	}

	case _C_SEL:
		if (*(SEL*)datum == NULL) {
			retobject = Py_None;
			Py_INCREF(retobject);
		} else {
			retobject = PyString_FromString(PyObjCRT_SELName(*(SEL*)datum)); 
		}
		break;

	case _C_CLASS:
	{
		Class c = *(Class *) datum;

		if (c == Nil) {
			retobject = Py_None;
			Py_INCREF (retobject);
		} else {
			retobject = (PyObject *) PyObjCClass_New(c);
		}
		break;
	}

	case _C_PTR:
		if (*(void**)datum == NULL) {
			retobject = Py_None;
			Py_INCREF(retobject);
		} else {
			retobject = PyObjCPointerWrapper_ToPython(type, datum);
			if (retobject == NULL && !PyErr_Occurred()) {
				retobject = (PyObject*)PyObjCPointer_New(
					*(void**) datum, type+1);
			}
		}
		break;
  
	case _C_UNION_B:
	{
		int size = PyObjCRT_SizeOfType (type);
		if (size == -1) return NULL;
		retobject = PyString_FromStringAndSize ((void*)datum, size);
		break;
	}

	case _C_STRUCT_B:
		retobject = pythonify_c_struct (type, datum);
		break;

	case _C_ARY_B:
		retobject = pythonify_c_array (type, datum);
		break;

	case _C_VOID:
		retobject = Py_None;
		Py_INCREF (retobject);
		break;

	default:
		PyErr_Format(PyObjCExc_Error, 
			"pythonify_c_value: unhandled value type (%c|%d|%s)",
			*type, *type, type);
		break;
	}

	return retobject;
}


int PyObjCRT_SizeOfReturnType(const char* type)
{
	switch(*type) {
	case _C_CHR:
	case _C_UCHR:
	case _C_SHT:
	case _C_USHT:
		return sizeof(int);
	default:
		return PyObjCRT_SizeOfType(type);
	}
}

/*
* Convert a python value to a basic C unsigned integer value.
*/
static int
depythonify_unsigned_int_value(
		PyObject* argument, char* descr,
		unsigned long long* out, unsigned long long max)
{
	if (PyInt_Check (argument)) {
		long temp = PyInt_AsLong(argument);
		if (temp < 0) {
			PyErr_Format(PyExc_ValueError,
				"depythonifying '%s', got negative '%s'",
					descr,
					argument->ob_type->tp_name);
			return -1;

		} else if ((unsigned long long)temp > max) {
			PyErr_Format(PyExc_ValueError,
				"depythonifying '%s', got '%s' of "
				"wrong magnitude", descr,
					argument->ob_type->tp_name);
			return -1;
		}
		*out = temp;
		return 0;

	} else if (PyLong_Check(argument)) {
		*out = PyLong_AsUnsignedLongLong(argument);
		if (PyErr_Occurred()) {
			PyErr_Format(PyExc_ValueError,
				"depythonifying '%s', got '%s' of "
				"wrong magnitude", descr,
					argument->ob_type->tp_name);
			return -1;
		}

		if (*out > max) {
			PyErr_Format(PyExc_ValueError,
				"depythonifying '%s', got '%s' of "
				"wrong magnitude", descr,
					argument->ob_type->tp_name);
			return -1;
		}
		return 0;

	} else {
		PyObject* tmp;

		if (PyString_Check(argument) || PyUnicode_Check(argument)) {
			PyErr_Format(PyExc_ValueError,
				"depythonifying '%s', got '%s'",
					descr,
					argument->ob_type->tp_name);
			return -1;
		}

		tmp = PyNumber_Long(argument);
		if (tmp != NULL) {
			*out = PyLong_AsUnsignedLongLong(tmp);
			Py_DECREF(tmp);

			if (*out <= max) {
				return 0;
			}
		}

		PyErr_Format(PyExc_ValueError,
			"depythonifying '%s', got '%s'",
				descr,
				argument->ob_type->tp_name);
		return -1;
	}
}

/*
* Convert a python value to a basic C signed integer value.
*/
static int
depythonify_signed_int_value(
		PyObject* argument, char* descr,
		long long* out, long long min, long long max)
{
	if (PyInt_Check (argument)) {
		*out = (long long)PyInt_AsLong(argument);
		if (*out < min || *out > max) {
			PyErr_Format(PyExc_ValueError,
				"depythonifying '%s', got '%s' of "
				"wrong magnitude", descr,
					argument->ob_type->tp_name);
			return -1;
		}
		return 0;

	} else if (PyLong_Check(argument)) {
		*out = PyLong_AsLongLong(argument);
		if (PyErr_Occurred()) {
			PyErr_Format(PyExc_ValueError,
				"depythonifying '%s', got '%s' of "
				"wrong magnitude", descr,
					argument->ob_type->tp_name);
			return -1;
		}

		if (*out < min || *out > max) {
			PyErr_Format(PyExc_ValueError,
				"depythonifying '%s', got '%s' of "
				"wrong magnitude", descr,
					argument->ob_type->tp_name);
			return -1;
		}
		return 0;

	} else {
		PyObject* tmp;

		if (PyString_Check(argument) || PyUnicode_Check(argument)) {
			PyErr_Format(PyExc_ValueError,
				"depythonifying '%s', got '%s' of %d",
					descr,
					argument->ob_type->tp_name,
					PyString_Size(argument));
			return -1;
		}

		
		tmp = PyNumber_Long(argument);
		if (tmp != NULL) {
			*out = PyLong_AsLongLong(tmp);
			Py_DECREF(tmp);

			if (*out >= min && *out <= max) {
				return 0;
			}
		}

		PyErr_Format(PyExc_ValueError,
			"depythonifying '%s', got '%s'",
				descr,
				argument->ob_type->tp_name);
		return -1;
	}
}

int depythonify_c_return_value(
const char* type, PyObject* argument, void* datum)
{
	long long temp;
	unsigned long long utemp;
	int       r;

	switch (*type) {
	case _C_CHR: 
		if (PyString_Check(argument) && PyString_Size(argument) == 1) {
			*(int*) datum = PyString_AsString (argument)[0];
			return 0;
		}

		r = depythonify_signed_int_value(argument, "char",
			&temp, CHAR_MIN, CHAR_MAX);
		if (r == 0) {
			*(int*)datum = temp;
		}
		return r;

	case _C_UCHR:
		if (PyString_Check(argument) && PyString_Size(argument) == 1) {
			*(unsigned int*) datum = 
				PyString_AsString (argument)[0];
			return 0;
		}
		r = depythonify_unsigned_int_value(argument, "unsigned short",
			&utemp, UCHAR_MAX);
		if (r == 0) {
			*(unsigned int*)datum = utemp;
		}
		return r;

	case _C_SHT:
		r = depythonify_signed_int_value(argument, "short",
			&temp, SHRT_MIN, SHRT_MAX);
		if (r == 0) {
			*(int*)datum = temp;
		}
		return r;

	case _C_USHT:
		r = depythonify_unsigned_int_value(argument, "unsigned short",
			&utemp, USHRT_MAX);
		if (r == 0) {
			*(unsigned int*)datum = utemp;
		}
		return r;

	default:
		return depythonify_c_value(type, argument, datum);
	}
}

PyObject *
pythonify_c_return_value (const char *type, void *datum)
{
	static  const char intType[] = { _C_INT, 0 };
	static  const char uintType[] = { _C_UINT, 0 };

	switch(*type) {
	case _C_CHR: 
	case _C_SHT:
		return pythonify_c_value(intType, datum);
	case _C_UCHR: case _C_USHT:
		return pythonify_c_value(uintType, datum);

	default:
		return pythonify_c_value(type, datum);
	}
}


int
depythonify_c_value (const char *type, PyObject *argument, void *datum)
{
	/* Pass by reference output arguments are sometimes passed a NULL 
	 * pointer, this surpresses a core dump.
	 */
	long long temp;
	unsigned long long utemp;
	int       r;

	if (!datum) return 0;

	type = PyObjCRT_SkipTypeQualifiers (type);

	switch (*type) {
#ifdef _C_ATOM
	case _C_ATOM:
#endif
	case _C_CHARPTR:
		if (!PyString_Check (argument) && argument != Py_None) {
			PyErr_Format(PyExc_ValueError,
				"depythonifying 'charptr', got '%s'",
					argument->ob_type->tp_name);
			return -1;
		} else if (argument == Py_None) {
			*(char **) datum = NULL;
		} else {
			*(char **) datum = PyString_AS_STRING(
				(PyStringObject*)argument);
		}
		break;

	case _C_CHR:
		if (PyString_Check(argument) && PyString_Size(argument) == 1) {
			*(char*) datum = PyString_AsString (argument)[0];
			return 0;
		}

		r = depythonify_signed_int_value(argument, "char",
			&temp, CHAR_MIN, CHAR_MAX);
		if (r == 0) {
			*(char*)datum = temp;
		}
		return r;

	case _C_UCHR:
		if (PyString_Check(argument) && PyString_Size(argument) == 1) {
			*(unsigned char*) datum = 
				PyString_AsString (argument)[0];
			return 0;
		}
		r = depythonify_unsigned_int_value(argument, "unsigned short",
			&utemp, UCHAR_MAX);
		if (r == 0) {
			*(unsigned char*)datum = utemp;
		}
		return r;

	case _C_SHT:
		r = depythonify_signed_int_value(argument, "short",
			&temp, SHRT_MIN, SHRT_MAX);
		if (r == 0) {
			*(short*)datum = temp;
		}
		return r;

	case _C_USHT:
		r = depythonify_unsigned_int_value(argument, "unsigned short",
			&utemp, USHRT_MAX);
		if (r == 0) {
			*(unsigned short*)datum = utemp;
		}
		return r;

#ifdef _C_BOOL
	case _C_BOOL:
		*(bool*)datum = PyObject_IsTrue(argument);
		return 0;
#endif

	case _C_INT:
		r = depythonify_signed_int_value(argument, "int",
			&temp, INT_MIN, INT_MAX);
		if (r == 0) {
			*(int*)datum = temp;
		}
		return r;

	case _C_UINT:
		r = depythonify_unsigned_int_value(argument, "unsigned int",
			&utemp, UINT_MAX);
		if (r == 0) {
			*(unsigned int*)datum = utemp;
		}
		return r;

	case _C_LNG:
		r = depythonify_signed_int_value(argument, "long",
			&temp, LONG_MIN, LONG_MAX);
		if (r == 0) {
			*(long*)datum = temp;
		}
		return r;

	case _C_ULNG:
		r = depythonify_unsigned_int_value(argument, "unsigned long",
			&utemp, ULONG_MAX);
		if (r == 0) {
			*(unsigned long*)datum = utemp;
		}
		return r;

	case _C_LNGLNG:
		r = depythonify_signed_int_value(argument, "long long",
			&temp, LLONG_MIN, LLONG_MAX);
		if (r == 0) {
			*(long long*)datum = temp;
		}
		return r;

	case _C_ULNGLNG:
		r = depythonify_unsigned_int_value(argument, 
			"unsigned long long", &utemp, ULLONG_MAX);
		if (r == 0) {
			*(unsigned long long*)datum = utemp;
		}
		return r;

	case _C_ID:
		/*
			XXX
			
			This should, for values other than Py_None, always return the same id
			for the same PyObject for as long as that id lives.  I think that the
			implementation of this should be moved to OC_PythonObject,
			which would itself have a map of PyObject->id.  The dealloc
			of each of these custom objects should notify OC_PythonObject
			to remove map entry.  We need to significantly change how immutable types
			are bridged, and create OC_PythonString, OC_PythonBool, etc. which are 
			subclasses of what they should be from the the Objective C side.

			If we don't do this, we break binary plist serialization, and likely
			other things, which assume that foo[bar] is foo[bar] for the duration of
			the serialization process.  I would imagine that other things also
			assume this kind of invariant, so we should do it here rather than in every
			container object.
		*/
				

		return [OC_PythonObject wrapPyObject:argument toId:(id *)datum];

	case _C_CLASS:
		if (PyObjCClass_Check(argument))  {
			*(Class*) datum = PyObjCClass_GetClass(argument);
		} else if (argument == Py_None) {
			*(Class*) datum = nil;
		} else {
			PyErr_Format(PyExc_ValueError,
				"depythonifying 'Class', got '%s'",
					argument->ob_type->tp_name);
			return -1;
		}
		break;

	case _C_SEL:
		if (argument == Py_None) {
			*(SEL*)datum = NULL;
		} else if (PyObjCSelector_Check (argument)) {
			*(SEL *) datum = PyObjCSelector_GetSelector(argument); 
		} else if (PyString_Check(argument)) {
			char *selname = PyString_AsString (argument);
			SEL sel;

			if (*selname == '\0') {
				*(SEL*)datum = NULL;
			} else {
				sel = PyObjCRT_SELUID (selname);

				if (sel)  {
					*(SEL*) datum = sel;
				} else {
					PyErr_Format(PyExc_ValueError,
						"depythonifying 'SEL', cannot "
						"register string with runtime");
					return -1;
				}
			}
		} else {
			PyErr_Format(PyExc_ValueError,
				"depythonifying 'SEL', got '%s'",
					argument->ob_type->tp_name);
			return -1;
		}
		break;


	case _C_PTR:
		if (argument == Py_None) {
			*(void**)datum = NULL;
			return 0;
		} 
		r = PyObjCPointerWrapper_FromPython(type, argument, datum);
		if (r == -1) {
			if (PyErr_Occurred()) {
				return -1;
			} else if (PyObjCPointer_Check (argument)) {
				*(void **) datum = PyObjCPointer_Ptr(argument);
			} else {
				PyErr_Format(PyExc_ValueError,
					"depythonifying 'pointer', got '%s'",
						argument->ob_type->tp_name);
				return -1;
			}
		}
		break;

	case _C_FLT:
		if (PyFloat_Check (argument)) {
			*(float *) datum = (float)PyFloat_AsDouble (argument);
		} else if (PyInt_Check (argument)) {
			*(float *) datum = (float) PyInt_AsLong (argument);
		} else if (PyString_Check(argument) || PyUnicode_Check(argument)) {
			PyErr_Format(PyExc_ValueError,
				"depythonifying 'float', got '%s'",
					argument->ob_type->tp_name);
			return -1;
		} else {
			PyObject* tmp = PyNumber_Float(argument);
			if (tmp != NULL) {
				double dblval = PyFloat_AsDouble(tmp);
				Py_DECREF(tmp);
				*(float*) datum = dblval;
				return 0;
			}

			PyErr_Format(PyExc_ValueError,
				"depythonifying 'float', got '%s'",
					argument->ob_type->tp_name);
			return -1;
		}
		break;

	case _C_DBL:
		if (PyFloat_Check (argument)) {
			*(double *) datum = PyFloat_AsDouble (argument);
		} else if (PyInt_Check (argument)) {
			*(double *) datum = (double) PyInt_AsLong (argument);
		} else if (PyString_Check(argument) || PyUnicode_Check(argument)) {
			PyErr_Format(PyExc_ValueError,
				"depythonifying 'float', got '%s'",
					argument->ob_type->tp_name);
			return -1;
		} else {
			PyObject* tmp = PyNumber_Float(argument);
			if (tmp != NULL) {
				double dblval = PyFloat_AsDouble(tmp);
				Py_DECREF(tmp);
				*(double*) datum = dblval;
				return 0;
			}

			PyErr_Format(PyExc_ValueError,
				"depythonifying 'double', got '%s'",
					argument->ob_type->tp_name);
			return -1;
		}
		break;

	case _C_UNION_B:
		if (PyString_Check (argument)) {
			int expected_size = PyObjCRT_SizeOfType (type);

			if (expected_size == -1) {
				PyErr_Format(PyExc_ValueError,
					"depythonifying 'union' of "
					"unknown size");
				return -1;
			} else if (expected_size != PyString_Size (argument)) {
				PyErr_Format(PyExc_ValueError,
					"depythonifying 'union' of size %d, "
					"got string of %d",
						   expected_size, 
						   PyString_Size (argument));
				return -1;
			} else {
				memcpy ((void *) datum, 
					PyString_AS_STRING (argument), 
				expected_size);
			}
		} else {
			PyErr_Format(PyExc_ValueError,
				"depythonifying 'union', got '%s'",
					argument->ob_type->tp_name);
			return -1;
		}
		break;

	case _C_STRUCT_B:
		return depythonify_c_struct (type, argument, datum);

	case _C_ARY_B:
		return depythonify_c_array (type, argument, datum);

	default:
		PyErr_Format(PyExc_ValueError,
			"depythonifying unknown typespec %#x", *type);
		return -1;
	}
	return 0;
}