summaryrefslogtreecommitdiff
path: root/ace/CDR_Stream.h
blob: 43924328cc4c849e4b07e9e7f9b468a3e726346d (plain)
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
// -*- C++ -*-

//=============================================================================
/**
 *  @file   CDR_Stream.h
 *
 *  $Id$
 *
 * ACE Common Data Representation (CDR) marshaling and demarshaling
 * classes.
 *
 * This implementation was inspired in the CDR class in SunSoft's
 * IIOP engine, but has a completely different implementation and a
 * different interface too.
 *
 * The current implementation assumes that the host has 1-byte,
 * 2-byte and 4-byte integral types, and that it has single
 * precision and double precision IEEE floats.
 * Those assumptions are pretty good these days, with Crays beign
 * the only known exception.
 *
 *  @author TAO version by Aniruddha Gokhale <gokhale@cs.wustl.edu>
 *  @author Carlos O'Ryan <coryan@cs.wustl.edu>
 *  @author ACE version by Jeff Parsons <parsons@cs.wustl.edu>
 *  @author Istvan Buki <istvan.buki@euronet.be>
 *  @author Codeset translation by Jim Rogers <jrogers@viasoft.com>
 */
//=============================================================================

#ifndef ACE_CDR_STREAM_H
#define ACE_CDR_STREAM_H

#include /**/ "ace/pre.h"

#include "ace/CDR_Base.h"

#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */

#include "ace/SStringfwd.h"
#include "ace/Message_Block.h"


// Stuff used by the ACE CDR classes.
#if defined ACE_LITTLE_ENDIAN
#  define ACE_CDR_BYTE_ORDER 1
// little endian encapsulation byte order has value = 1
#else  /* ! ACE_LITTLE_ENDIAN */
#  define ACE_CDR_BYTE_ORDER 0
// big endian encapsulation byte order has value = 0
#endif /* ! ACE_LITTLE_ENDIAN */


class ACE_Char_Codeset_Translator;
class ACE_WChar_Codeset_Translator;

class ACE_InputCDR;

/**
 * @class ACE_OutputCDR
 *
 * @brief A CDR stream for writing, i.e. for marshalling.
 *
 * This class is based on the the CORBA spec for Java (98-02-29),
 * java class omg.org.CORBA.portable.OutputStream.  It diverts in
 * a few ways:
 * + Operations taking arrays don't have offsets, because in C++
 *   it is easier to describe an array starting from x+offset.
 * + Operations return an error status, because exceptions are
 *   not widely available in C++ (yet).
 */
class ACE_Export ACE_OutputCDR
{
public:
  /**
   * The Codeset translators need access to some private members to
   * efficiently marshal arrays
   * For reading from an output CDR stream.
   */
  friend class ACE_Char_Codeset_Translator;
  friend class ACE_WChar_Codeset_Translator;
  friend class ACE_InputCDR;

  /// Default constructor, allocates <size> bytes in the internal
  /// buffer, if <size> == 0 it allocates the default size.
  ACE_OutputCDR (size_t size = 0,
                 int byte_order = ACE_CDR_BYTE_ORDER,
                 ACE_Allocator* buffer_allocator = 0,
                 ACE_Allocator* data_block_allocator = 0,
                 ACE_Allocator* message_block_allocator = 0,
                 size_t memcpy_tradeoff =
                 ACE_DEFAULT_CDR_MEMCPY_TRADEOFF,
                 ACE_CDR::Octet major_version =
                 ACE_CDR_GIOP_MAJOR_VERSION,
                 ACE_CDR::Octet minor_version =
                 ACE_CDR_GIOP_MINOR_VERSION);

  /// Build a CDR stream with an initial buffer, it will *not* remove
  /// <data>, since it did not allocated it.  It's important to be careful
  /// with the alignment of <data>.
  /**
   * Create an output stream from an arbitrary buffer, care must be
   * exercised with alignment, because this contructor will align if
   * needed.  In this case <data> will not point to the start off the
   * output stream. begin()->rd_prt() points to the start off the
   * output stream.  See ACE_ptr_align_binary() to properly align a
   * pointer and use ACE_CDR::MAX_ALIGNMENT for the correct alignment.
   */
  ACE_OutputCDR (char *data,
                 size_t size,
                 int byte_order = ACE_CDR_BYTE_ORDER,
                 ACE_Allocator* buffer_allocator = 0,
                 ACE_Allocator* data_block_allocator = 0,
                 ACE_Allocator* message_block_allocator = 0,
                 size_t memcpy_tradeoff=
                 ACE_DEFAULT_CDR_MEMCPY_TRADEOFF,
                 ACE_CDR::Octet giop_major_version =
                 ACE_CDR_GIOP_MAJOR_VERSION,
                 ACE_CDR::Octet giop_minor_version =
                 ACE_CDR_GIOP_MINOR_VERSION);

  /// Build a CDR stream with an initial Message_Block chain, it will
  /// *not* remove <data>, since it did not allocate it.
  ACE_OutputCDR (ACE_Message_Block *data,
                 int byte_order = ACE_CDR_BYTE_ORDER,
                 size_t memcpy_tradeoff=
                 ACE_DEFAULT_CDR_MEMCPY_TRADEOFF,
                 ACE_CDR::Octet giop_major_version =
                 ACE_CDR_GIOP_MAJOR_VERSION,
                 ACE_CDR::Octet giop_minor_version =
                 ACE_CDR_GIOP_MINOR_VERSION);

  /// destructor
  ~ACE_OutputCDR (void);

  /**
   * Disambiguate overload when inserting booleans, octets, chars, and
   * bounded strings.
   */
  //@{ @name Helper classes

  struct ACE_Export from_boolean
  {
    explicit from_boolean (ACE_CDR::Boolean b);
    ACE_CDR::Boolean val_;
  };

  struct ACE_Export from_octet
  {
    explicit from_octet (ACE_CDR::Octet o);
    ACE_CDR::Octet val_;
  };

  struct ACE_Export from_char
  {
    explicit from_char (ACE_CDR::Char c);
    ACE_CDR::Char val_;
  };

  struct ACE_Export from_wchar
  {
    explicit from_wchar (ACE_CDR::WChar wc);
    ACE_CDR::WChar val_;
  };

  struct ACE_Export from_string
  {
    from_string (ACE_CDR::Char* s,
                 ACE_CDR::ULong b,
                 ACE_CDR::Boolean nocopy = 0);
    from_string (const ACE_CDR::Char* s,
                 ACE_CDR::ULong b,
                 ACE_CDR::Boolean nocopy = 0);
    ACE_CDR::Char *val_;
    ACE_CDR::ULong bound_;
    ACE_CDR::Boolean nocopy_;
  };

  struct ACE_Export from_wstring
  {
    from_wstring (ACE_CDR::WChar* ws,
                  ACE_CDR::ULong b,
                  ACE_CDR::Boolean nocopy = 0);
    from_wstring (const ACE_CDR::WChar* ws,
                  ACE_CDR::ULong b,
                  ACE_CDR::Boolean nocopy = 0);
    ACE_CDR::WChar *val_;
    ACE_CDR::ULong bound_;
    ACE_CDR::Boolean nocopy_;
  };
  //@}

  // Return 0 on failure and 1 on success.
  //@{ @name Write operations
  ACE_CDR::Boolean write_boolean (ACE_CDR::Boolean x);
  ACE_CDR::Boolean write_char (ACE_CDR::Char x);
  ACE_CDR::Boolean write_wchar (ACE_CDR::WChar x);
  ACE_CDR::Boolean write_octet (ACE_CDR::Octet x);
  ACE_CDR::Boolean write_short (ACE_CDR::Short x);
  ACE_CDR::Boolean write_ushort (ACE_CDR::UShort x);
  ACE_CDR::Boolean write_long (ACE_CDR::Long x);
  ACE_CDR::Boolean write_ulong (ACE_CDR::ULong x);
  ACE_CDR::Boolean write_longlong (const ACE_CDR::LongLong &x);
  ACE_CDR::Boolean write_ulonglong (const ACE_CDR::ULongLong &x);
  ACE_CDR::Boolean write_float (ACE_CDR::Float x);
  ACE_CDR::Boolean write_double (const ACE_CDR::Double &x);
  ACE_CDR::Boolean write_longdouble (const ACE_CDR::LongDouble &x);

  /// For string we offer methods that accept a precomputed length.
  ACE_CDR::Boolean write_string (const ACE_CDR::Char *x);
  ACE_CDR::Boolean write_string (ACE_CDR::ULong len,
                                 const ACE_CDR::Char *x);
  ACE_CDR::Boolean write_string (const ACE_CString &x);
  ACE_CDR::Boolean write_wstring (const ACE_CDR::WChar *x);
  ACE_CDR::Boolean write_wstring (ACE_CDR::ULong length,
                                  const ACE_CDR::WChar *x);
  //@}

  /// Note: the portion written starts at <x> and ends
  ///    at <x + length>.
  /// The length is *NOT* stored into the CDR stream.
  //@{ @name Array write operations
  ACE_CDR::Boolean write_boolean_array (const ACE_CDR::Boolean *x,
                                        ACE_CDR::ULong length);
  ACE_CDR::Boolean write_char_array (const ACE_CDR::Char *x,
                                     ACE_CDR::ULong length);
  ACE_CDR::Boolean write_wchar_array (const ACE_CDR::WChar* x,
                                      ACE_CDR::ULong length);
  ACE_CDR::Boolean write_octet_array (const ACE_CDR::Octet* x,
                                      ACE_CDR::ULong length);
  ACE_CDR::Boolean write_short_array (const ACE_CDR::Short *x,
                                      ACE_CDR::ULong length);
  ACE_CDR::Boolean write_ushort_array (const ACE_CDR::UShort *x,
                                       ACE_CDR::ULong length);
  ACE_CDR::Boolean write_long_array (const ACE_CDR::Long *x,
                                     ACE_CDR::ULong length);
  ACE_CDR::Boolean write_ulong_array (const ACE_CDR::ULong *x,
                                      ACE_CDR::ULong length);
  ACE_CDR::Boolean write_longlong_array (const ACE_CDR::LongLong* x,
                                         ACE_CDR::ULong length);
  ACE_CDR::Boolean write_ulonglong_array (const ACE_CDR::ULongLong *x,
                                          ACE_CDR::ULong length);
  ACE_CDR::Boolean write_float_array (const ACE_CDR::Float *x,
                                      ACE_CDR::ULong length);
  ACE_CDR::Boolean write_double_array (const ACE_CDR::Double *x,
                                       ACE_CDR::ULong length);
  ACE_CDR::Boolean write_longdouble_array (const ACE_CDR::LongDouble* x,
                                           ACE_CDR::ULong length);

  /// Write an octet array contained inside a MB, this can be optimized
  /// to minimize copies.
  ACE_CDR::Boolean write_octet_array_mb (const ACE_Message_Block* mb);
  //@}

  /**
   * Return 0 on failure and 1 on success.
   */
  //@{ @name Append contents of own CDR stream to another
  ACE_CDR::Boolean append_boolean (ACE_InputCDR &);
  ACE_CDR::Boolean append_char (ACE_InputCDR &);
  ACE_CDR::Boolean append_wchar (ACE_InputCDR &);
  ACE_CDR::Boolean append_octet (ACE_InputCDR &);
  ACE_CDR::Boolean append_short (ACE_InputCDR &);
  ACE_CDR::Boolean append_ushort (ACE_InputCDR &);
  ACE_CDR::Boolean append_long (ACE_InputCDR &);
  ACE_CDR::Boolean append_ulong (ACE_InputCDR &);
  ACE_CDR::Boolean append_longlong (ACE_InputCDR &);
  ACE_CDR::Boolean append_ulonglong (ACE_InputCDR &);
  ACE_CDR::Boolean append_float (ACE_InputCDR &);
  ACE_CDR::Boolean append_double (ACE_InputCDR &);
  ACE_CDR::Boolean append_longdouble (ACE_InputCDR &);

  ACE_CDR::Boolean append_wstring (ACE_InputCDR &);
  ACE_CDR::Boolean append_string (ACE_InputCDR &);
  //@}

  /// Returns @c false if an error has ocurred.
  /**
   * @note The only expected error is to run out of memory.
   */
  bool good_bit (void) const;

  /// Reuse the CDR stream to write on the old buffer.
  void reset (void);

  /// Add the length of each message block in the chain.
  size_t total_length (void) const;

  /**
   * Return the start of the message block chain for this CDR stream.
   * NOTE: The complete CDR stream is represented by a chain of
   * message blocks.
   */
  const ACE_Message_Block *begin (void) const;

  /// Return the last message in the chain that is is use.
  const ACE_Message_Block *end (void) const;

  /// Return the <current_> message block in chain.
  const ACE_Message_Block *current (void) const;

  /**
   * Access the underlying buffer (read only).  NOTE: This
   * method only returns a pointer to the first block in the
   * chain.
   */
  const char *buffer (void) const;

  /**
   * Return the start and size of the internal buffer.NOTE: This
   * method only returns information about the first block in the
   * chain.
   */
  size_t length (void) const;

  /**
   * Utility function to allow the user more flexibility.
   * Pads the stream up to the nearest <alignment>-byte boundary.
   * Argument MUST be a power of 2.
   * Returns 0 on success and -1 on failure.
   */
  int align_write_ptr (size_t alignment);

  /// Access the codeset translators. They can be null!
  ACE_Char_Codeset_Translator *char_translator (void) const;
  ACE_WChar_Codeset_Translator *wchar_translator (void) const;

  /// Set the char codeset translator.
  void char_translator (ACE_Char_Codeset_Translator *);
  /// Set the wchar codeset translator.
  void wchar_translator (ACE_WChar_Codeset_Translator *);

  /// set the global size of serialized wchars. This may be different
  /// than the size of a wchar_t.
  static void wchar_maxbytes (int );

  /// access the serialized size of wchars.
  static int wchar_maxbytes (void);

  /**
   * Return alignment of the wr_ptr(), with respect to the start of
   * the CDR stream.  This is not the same as the alignment of
   * current->wr_ptr()!
   */
  size_t current_alignment (void) const;

  /**
   * Returns (in <buf>) the next position in the buffer aligned to
   * <size>, it advances the Message_Block wr_ptr past the data
   * (i.e., <buf> + <size>). If necessary it grows the Message_Block
   * buffer.  Sets the good_bit to 0 and returns a -1 on failure.
   */
  int adjust (size_t size,
              char *&buf);

  /// As above, but now the size and alignment requirements may be
  /// different.
  int adjust (size_t size,
              size_t align,
              char *&buf);

  /// If non-zero then this stream is writing in non-native byte order,
  /// this is only meaningful if ACE_ENABLE_SWAP_ON_WRITE is defined.
  bool do_byte_swap (void) const;

  /// If <do_byte_swap> returns 0, this returns ACE_CDR_BYTE_ORDER else
  /// it returns !ACE_CDR_BYTE_ORDER.
  int byte_order (void) const;

  /// For use by a gateway, which creates the output stream for the
  /// reply to the client in its native byte order, but which must
  /// send the reply in the byte order of the target's reply to the
  /// gateway.
  void reset_byte_order (int byte_order);

  /// set GIOP version info
  int set_version (ACE_CDR::Octet major,
                   ACE_CDR::Octet minor);

  /// Set the underlying GIOP version..
  int get_version (ACE_CDR::Octet &major,
                   ACE_CDR::Octet &minor);
private:
  /// disallow copying...
  ACE_OutputCDR (const ACE_OutputCDR& rhs);
  ACE_OutputCDR& operator= (const ACE_OutputCDR& rhs);

  ACE_CDR::Boolean write_1 (const ACE_CDR::Octet *x);
  ACE_CDR::Boolean write_2 (const ACE_CDR::UShort *x);
  ACE_CDR::Boolean write_4 (const ACE_CDR::ULong *x);
  ACE_CDR::Boolean write_8 (const ACE_CDR::ULongLong *x);
  ACE_CDR::Boolean write_16 (const ACE_CDR::LongDouble *x);

  /**
   * write an array of <length> elements, each of <size> bytes and the
   * start aligned at a multiple of <align>. The elements are assumed
   * to be packed with the right alignment restrictions.  It is mostly
   * designed for buffers of the basic types.
   *
   * This operation uses <memcpy>; as explained above it is expected
   * that using assignment is faster that <memcpy> for one element,
   * but for several elements <memcpy> should be more efficient, it
   * could be interesting to find the break even point and optimize
   * for that case, but that would be too platform dependent.
   */
  ACE_CDR::Boolean write_array (const void *x,
                                size_t size,
                                size_t align,
                                ACE_CDR::ULong length);


  ACE_CDR::Boolean write_wchar_array_i (const ACE_CDR::WChar* x,
                                        ACE_CDR::ULong length);


  /**
   * Grow the CDR stream. When it returns <buf> contains a pointer to
   * memory in the CDR stream, with at least <size> bytes ahead of it
   * and aligned to an <align> boundary. It moved the <wr_ptr> to <buf
   * + size>.
   */
  int grow_and_adjust (size_t size,
                       size_t align,
                       char *&buf);

private:
  /// The start of the chain of message blocks.
  ACE_Message_Block start_;

  /// The current block in the chain were we are writing.
  ACE_Message_Block *current_;

  /**
   * The current alignment as measured from the start of the buffer.
   * Usually this coincides with the alignment of the buffer in
   * memory, but, when we chain another buffer this "quasi invariant"
   * is broken.
   * The current_alignment is used to readjust the buffer following
   * the stolen message block.
   */
  size_t current_alignment_;

  /**
   * Is the current block writable.  When we steal a buffer from the
   * user and just chain it into the message block we are not supposed
   * to write on it, even if it is past the start and end of the
   * buffer.
   */
  bool current_is_writable_;

  /**
   * If not zero swap bytes at writing so the created CDR stream byte
   * order does *not* match the machine byte order.  The motivation
   * for such a beast is that in some setting a few (fast) machines
   * can be serving hundreds of slow machines with the opposite byte
   * order, so it makes sense (as a load balancing device) to put the
   * responsibility in the writers.  THIS IS NOT A STANDARD IN CORBA,
   * USE AT YOUR OWN RISK
   */
  bool do_byte_swap_;

  /// Set to 0 when an error ocurrs.
  bool good_bit_;

  /// Break-even point for copying.
  size_t memcpy_tradeoff_;

protected:
  /// GIOP version information
  ACE_CDR::Octet major_version_;
  ACE_CDR::Octet minor_version_;

  /// If not nil, invoke for translation of character and string data.
  ACE_Char_Codeset_Translator *char_translator_;
  ACE_WChar_Codeset_Translator *wchar_translator_;

  /**
   * Some wide char codesets may be defined with a maximum number
   * of bytes that is smaller than the size of a wchar_t. This means
   * that the CDR cannot simply memcpy a block of wchars to and from
   * the stream, but must instead realign the bytes appropriately.
   * In cases when wchar i/o is not allowed, such as with GIOP 1.0,
   * or not having a native wchar codeset defined, the maxbytes is
   * set to zero, indicating no wchar data is allowed.
   */
  static int wchar_maxbytes_;
};

// ****************************************************************

/**
 * @class ACE_InputCDR
 *
 * @brief A CDR stream for reading, i.e. for demarshalling.
 *
 * This class is based on the the CORBA spec for Java (98-02-29),
 * java class omg.org.CORBA.portable.InputStream.  It diverts in a
 * few ways:
 * + Operations to retrieve basic types take parameters by
 * reference.
 * + Operations taking arrays don't have offsets, because in C++
 * it is easier to describe an array starting from x+offset.
 * + Operations return an error status, because exceptions are
 * not widely available in C++ (yet).
 */
class ACE_Export ACE_InputCDR
{
public:
  /// The translator need privileged access to efficiently demarshal
  /// arrays and the such
  friend class ACE_Char_Codeset_Translator;
  friend class ACE_WChar_Codeset_Translator;

  /**
   * Create an input stream from an arbitrary buffer.  The buffer must
   * be properly aligned because this contructor will *not* work if
   * the buffer is aligned unproperly.See ACE_ptr_align_binary() for
   * instructions on how to align a pointer properly and use
   * ACE_CDR::MAX_ALIGNMENT for the correct alignment.
   */
  ACE_InputCDR (const char *buf,
                size_t bufsiz,
                int byte_order = ACE_CDR_BYTE_ORDER,
                ACE_CDR::Octet major_version =
                ACE_CDR_GIOP_MAJOR_VERSION,
                ACE_CDR::Octet minor_version =
                ACE_CDR_GIOP_MINOR_VERSION);

  /// Create an empty input stream. The caller is responsible for
  /// putting the right data and providing the right alignment.
  ACE_InputCDR (size_t bufsiz,
                int byte_order = ACE_CDR_BYTE_ORDER,
                ACE_CDR::Octet major_version =
                ACE_CDR_GIOP_MAJOR_VERSION,
                ACE_CDR::Octet minor_version =
                ACE_CDR_GIOP_MINOR_VERSION);

  /// Create an input stream from an ACE_Message_Block
  /**
   * The alignment of the @arg data block is carried into the new
   * ACE_InputCDR object. This constructor either increments the
   * @arg data reference count, or copies the data (if it's a compound
   * message block) so the caller can release the block immediately
   * upon return.
   */
  ACE_InputCDR (const ACE_Message_Block *data,
                int byte_order = ACE_CDR_BYTE_ORDER,
                ACE_CDR::Octet major_version =
                ACE_CDR_GIOP_MAJOR_VERSION,
                ACE_CDR::Octet minor_version =
                ACE_CDR_GIOP_MINOR_VERSION);

  /// Create an input stream from an ACE_Data_Block. The <flag>
  /// indicates whether the <data> can be deleted by the CDR stream
  /// or not
  ACE_InputCDR (ACE_Data_Block *data,
                ACE_Message_Block::Message_Flags flag = 0,
                int byte_order = ACE_CDR_BYTE_ORDER,
                ACE_CDR::Octet major_version =
                ACE_CDR_GIOP_MAJOR_VERSION,
                ACE_CDR::Octet minor_version =
                ACE_CDR_GIOP_MINOR_VERSION);

  /// Create an input stream from an ACE_Data_Block. It also sets the
  /// read and write pointers at the desired positions. This would be
  /// helpful if the applications desires to create a new CDR stream
  /// from a semi-processed datablock.
  ACE_InputCDR (ACE_Data_Block *data,
                ACE_Message_Block::Message_Flags flag,
                size_t read_pointer_position,
                size_t write_pointer_position,
                int byte_order = ACE_CDR_BYTE_ORDER,
                ACE_CDR::Octet major_version =
                ACE_CDR_GIOP_MAJOR_VERSION,
                ACE_CDR::Octet minor_version =
                ACE_CDR_GIOP_MINOR_VERSION);

  /**
   * These make a copy of the current stream state, but do not copy
   * the internal buffer, so the same stream can be read multiple
   * times efficiently.
   */
  ACE_InputCDR (const ACE_InputCDR& rhs);

  ACE_InputCDR& operator= (const ACE_InputCDR& rhs);

  /// When interpreting indirected TypeCodes it is useful to make a
  /// "copy" of the stream starting in the new position.
  ACE_InputCDR (const ACE_InputCDR& rhs,
                size_t size,
                ACE_CDR::Long offset);

  /// This creates an encapsulated stream, the first byte must be (per
  /// the spec) the byte order of the encapsulation.
  ACE_InputCDR (const ACE_InputCDR& rhs,
                size_t size);

  /// Create an input CDR from an output CDR.
  ACE_InputCDR (const ACE_OutputCDR& rhs,
                ACE_Allocator* buffer_allocator = 0,
                ACE_Allocator* data_block_allocator = 0,
                ACE_Allocator* message_block_allocator = 0);

  /// Helper class to transfer the contents from one input CDR to
  /// another without requiring any extra memory allocations, data
  /// copies or too many temporaries.
  struct ACE_Export Transfer_Contents
  {
    Transfer_Contents (ACE_InputCDR &rhs);

    ACE_InputCDR &rhs_;
  };
  /// Transfer the contents from <rhs> to a new CDR
  ACE_InputCDR (Transfer_Contents rhs);

  /// Destructor
  ~ACE_InputCDR (void);

  /// Disambiguate overloading when extracting octets, chars,
  /// booleans, and bounded strings
  //@{ @name Helper classes

  struct ACE_Export to_boolean
  {
    explicit to_boolean (ACE_CDR::Boolean &b);
    ACE_CDR::Boolean &ref_;
  };

  struct ACE_Export to_char
  {
    explicit to_char (ACE_CDR::Char &c);
    ACE_CDR::Char &ref_;
  };

  struct ACE_Export to_wchar
  {
    explicit to_wchar (ACE_CDR::WChar &wc);
    ACE_CDR::WChar &ref_;
  };

  struct ACE_Export to_octet
  {
    explicit to_octet (ACE_CDR::Octet &o);
    ACE_CDR::Octet &ref_;
  };

  struct ACE_Export to_string
  {
    /**
     * @deprecated The constructor taking a non-const string is now
     *             deprecated (C++ mapping 00-01-02), but we keep it
     *             around for backward compatibility.
     */
    to_string (ACE_CDR::Char *&s,
               ACE_CDR::ULong b);
    to_string (const ACE_CDR::Char *&s,
               ACE_CDR::ULong b);
    const ACE_CDR::Char *&val_;
    ACE_CDR::ULong bound_;
  };

  struct ACE_Export to_wstring
  {
    /// The constructor taking a non-const wstring is
    /// now deprecated (C++ mapping 00-01-02), but we
    /// keep it around for backward compatibility.
    to_wstring (ACE_CDR::WChar *&ws,
                ACE_CDR::ULong b);
    to_wstring (const ACE_CDR::WChar *&ws,
                ACE_CDR::ULong b);
    const ACE_CDR::WChar *&val_;
    ACE_CDR::ULong bound_;
  };
  //@}

  /**
   * Return @c false on failure and @c true on success.
   */
  //@{ @name Read basic IDL types
  ACE_CDR::Boolean read_boolean (ACE_CDR::Boolean& x);
  ACE_CDR::Boolean read_char (ACE_CDR::Char &x);
  ACE_CDR::Boolean read_wchar (ACE_CDR::WChar& x);
  ACE_CDR::Boolean read_octet (ACE_CDR::Octet& x);
  ACE_CDR::Boolean read_short (ACE_CDR::Short &x);
  ACE_CDR::Boolean read_ushort (ACE_CDR::UShort &x);
  ACE_CDR::Boolean read_long (ACE_CDR::Long &x);
  ACE_CDR::Boolean read_ulong (ACE_CDR::ULong &x);
  ACE_CDR::Boolean read_longlong (ACE_CDR::LongLong& x);
  ACE_CDR::Boolean read_ulonglong (ACE_CDR::ULongLong& x);
  ACE_CDR::Boolean read_float (ACE_CDR::Float &x);
  ACE_CDR::Boolean read_double (ACE_CDR::Double &x);
  ACE_CDR::Boolean read_longdouble (ACE_CDR::LongDouble &x);

  ACE_CDR::Boolean read_string (ACE_CDR::Char *&x);
  ACE_CDR::Boolean read_string (ACE_CString &x);
  ACE_CDR::Boolean read_wstring (ACE_CDR::WChar*& x);
  //@}

  /**
   * The buffer @a x must be large enough to contain @a length
   * elements.
   * Return @c false on failure and @c true on success.
   */
  //@{ @name Read basic IDL types arrays
  ACE_CDR::Boolean read_boolean_array (ACE_CDR::Boolean* x,
                                       ACE_CDR::ULong length);
  ACE_CDR::Boolean read_char_array (ACE_CDR::Char *x,
                                    ACE_CDR::ULong length);
  ACE_CDR::Boolean read_wchar_array (ACE_CDR::WChar* x,
                                     ACE_CDR::ULong length);
  ACE_CDR::Boolean read_octet_array (ACE_CDR::Octet* x,
                                     ACE_CDR::ULong length);
  ACE_CDR::Boolean read_short_array (ACE_CDR::Short *x,
                                     ACE_CDR::ULong length);
  ACE_CDR::Boolean read_ushort_array (ACE_CDR::UShort *x,
                                      ACE_CDR::ULong length);
  ACE_CDR::Boolean read_long_array (ACE_CDR::Long *x,
                                    ACE_CDR::ULong length);
  ACE_CDR::Boolean read_ulong_array (ACE_CDR::ULong *x,
                                     ACE_CDR::ULong length);
  ACE_CDR::Boolean read_longlong_array (ACE_CDR::LongLong* x,
                                        ACE_CDR::ULong length);
  ACE_CDR::Boolean read_ulonglong_array (ACE_CDR::ULongLong* x,
                                         ACE_CDR::ULong length);
  ACE_CDR::Boolean read_float_array (ACE_CDR::Float *x,
                                     ACE_CDR::ULong length);
  ACE_CDR::Boolean read_double_array (ACE_CDR::Double *x,
                                      ACE_CDR::ULong length);
  ACE_CDR::Boolean read_longdouble_array (ACE_CDR::LongDouble* x,
                                          ACE_CDR::ULong length);
  //@}

  /**
   * Return @c false on failure and @c true on success.
   */
  //@{ @name Skip elements
  ACE_CDR::Boolean skip_boolean (void);
  ACE_CDR::Boolean skip_char (void);
  ACE_CDR::Boolean skip_wchar (void);
  ACE_CDR::Boolean skip_octet (void);
  ACE_CDR::Boolean skip_short (void);
  ACE_CDR::Boolean skip_ushort (void);
  ACE_CDR::Boolean skip_long (void);
  ACE_CDR::Boolean skip_ulong (void);
  ACE_CDR::Boolean skip_longlong (void);
  ACE_CDR::Boolean skip_ulonglong (void);
  ACE_CDR::Boolean skip_float (void);
  ACE_CDR::Boolean skip_double (void);
  ACE_CDR::Boolean skip_longdouble (void);
  //@}

  /**
   * The next field must be a string, this method skips it. It is
   * useful in parsing a TypeCode.
   * @return @c false on failure and @c true on success.
   */
  ACE_CDR::Boolean skip_wstring (void);
  ACE_CDR::Boolean skip_string (void);

  /// Skip @a n bytes in the CDR stream.
  /**
   * @return @c false on failure and @c true on success.
   */
  ACE_CDR::Boolean skip_bytes (size_t n);

  /// returns @c false if a problem has been detected.
  bool good_bit (void) const;

  /**
   * @return The start of the message block chain for this CDR
   *         stream.
   *
   * @note In the current implementation the chain has length 1, but
   *       we are planning to change that.
   */
  const ACE_Message_Block* start (void) const;

  // = The following functions are useful to read the contents of the
  //   CDR stream from a socket or file.

  /**
   * Grow the internal buffer, reset @c rd_ptr to the first byte in
   * the new buffer that is properly aligned, and set @c wr_ptr to @c
   * rd_ptr @c + @c newsize
   */
  int grow (size_t newsize);

  /**
   * After reading and partially parsing the contents the user can
   * detect a change in the byte order, this method will let him/her
   * change it.
   */
  void reset_byte_order (int byte_order);

  /// Re-initialize the CDR stream, copying the contents of the chain
  /// of message_blocks starting from @a data.
  void reset (const ACE_Message_Block *data,
              int byte_order);

  /// Steal the contents from the current CDR.
  ACE_Message_Block *steal_contents (void);

  /// Steal the contents of @a cdr and make a shallow copy into this
  /// stream.
  void steal_from (ACE_InputCDR &cdr);

  /// Exchange data blocks with the caller of this method. The read
  /// and write pointers are also exchanged.
  /**
   * @note We now do only with the start_ message block.
   */
  void exchange_data_blocks (ACE_InputCDR &cdr);

  /// Copy the data portion from the @c cdr to this cdr and return the
  /// data content (ie. the ACE_Data_Block) from this CDR to the
  /// caller.
  /**
   * @note The caller is responsible for managing the memory of the
   *       returned ACE_Data_Block.
   */
  ACE_Data_Block* clone_from (ACE_InputCDR &cdr);

  /// Re-initialize the CDR stream, forgetting about the old contents
  /// of the stream and allocating a new buffer (from the allocators).
  void reset_contents (void);

  /// Returns the current position for the @c rd_ptr.
  char* rd_ptr (void);

  /// Returns the current position for the @c wr_ptr.
  char* wr_ptr (void);

  /// Return how many bytes are left in the stream.
  size_t length (void) const;

  /**
   * Utility function to allow the user more flexibility.
   * Skips up to the nearest @a alignment-byte boundary.
   * Argument MUST be a power of 2.
   *
   * @return 0 on success and -1 on failure.
   */
  int align_read_ptr (size_t alignment);

  /// If @c true then this stream is writing in non-native byte order.
  /// This is only meaningful if ACE_ENABLE_SWAP_ON_WRITE is defined.
  bool do_byte_swap (void) const;

  /// If @c do_byte_swap() returns @c false, this returns
  /// ACE_CDR_BYTE_ORDER else it returns !ACE_CDR_BYTE_ORDER.
  int byte_order (void) const;

  /// Access the codeset translators. They can be nil!
  ACE_Char_Codeset_Translator *char_translator (void) const;
  ACE_WChar_Codeset_Translator *wchar_translator (void) const;

  /// Set the codeset translators.
  void char_translator (ACE_Char_Codeset_Translator *);
  void wchar_translator (ACE_WChar_Codeset_Translator *);

  /**
   * Returns (in @a buf) the next position in the buffer aligned to
   * @a size.  It advances the Message_Block @c rd_ptr past the data
   * (i.e., @c buf @c + @c size).  Sets the good_bit to @c false and
   * returns a -1 on failure.
   */
  int adjust (size_t size,
              char *&buf);

  /// As above, but now the size and alignment requirements may be
  /// different.
  int adjust (size_t size,
              size_t align,
              char *&buf);

  /// Set the underlying GIOP version..
  int set_version (ACE_CDR::Octet major,
                   ACE_CDR::Octet minor);

  /// Set the underlying GIOP version..
  int get_version (ACE_CDR::Octet &major,
                   ACE_CDR::Octet &minor);

protected:

  /// The start of the chain of message blocks, even though in the
  /// current version the chain always has length 1.
  ACE_Message_Block start_;

  /// The CDR stream byte order does not match the one on the machine,
  /// swapping is needed while reading.
  bool do_byte_swap_;

  /// set to @c false when an error occurs.
  bool good_bit_;

  /// The GIOP versions for this stream
  ACE_CDR::Octet major_version_;
  ACE_CDR::Octet minor_version_;

  /// If not nil, invoke for translation of character and string data.
  ACE_Char_Codeset_Translator *char_translator_;
  ACE_WChar_Codeset_Translator *wchar_translator_;

private:

  ACE_CDR::Boolean read_1 (ACE_CDR::Octet *x);
  ACE_CDR::Boolean read_2 (ACE_CDR::UShort *x);
  ACE_CDR::Boolean read_4 (ACE_CDR::ULong *x);
  ACE_CDR::Boolean read_8 (ACE_CDR::ULongLong *x);
  ACE_CDR::Boolean read_16 (ACE_CDR::LongDouble *x);

  // Several types can be read using the same routines, since TAO
  // tries to use native types with known size for each CORBA type.
  // We could use void* or char* to make the interface more
  // consistent, but using native types let us exploit the strict
  // alignment requirements of CDR streams and implement the
  // operations using asignment.

  /**
   * Read an array of <length> elements, each of <size> bytes and the
   * start aligned at a multiple of <align>. The elements are assumed
   * to be packed with the right alignment restrictions.  It is mostly
   * designed for buffers of the basic types.
   *
   * This operation uses <memcpy>; as explained above it is expected
   * that using assignment is faster that <memcpy> for one element,
   * but for several elements <memcpy> should be more efficient, it
   * could be interesting to find the break even point and optimize
   * for that case, but that would be too platform dependent.
   */
  ACE_CDR::Boolean read_array (void* x,
                               size_t size,
                               size_t align,
                               ACE_CDR::ULong length);

  /**
   * On those occasions when the native codeset for wchar is smaller than
   * the size of a wchar_t, such as using UTF-16 with a 4-byte wchar_t, a
   * special form of reading the array is needed. Actually, this should be
   * a default translator.
   */
  ACE_CDR::Boolean read_wchar_array_i (ACE_CDR::WChar * x,
                                       ACE_CDR::ULong length);

  /// Move the rd_ptr ahead by <offset> bytes.
  void rd_ptr (size_t offset);

  /// Points to the continuation field of the current message block.
  char* end (void);
};

// ****************************************************************

/**
 * @class ACE_Char_Codeset_Translator
 *
 * @brief Codeset translation routines common to both Output and Input
 * CDR streams.
 *
 * This class is a base class for defining codeset translation
 * routines to handle the character set translations required by
 * both CDR Input streams and CDR Output streams.
 *
 * Translators are reference counted. This allows for stateful as well
 * as stateless translators. Stateless translators will be allocated
 * once whereas CDR Streams own their own copy of a stateful translator.
 */
class ACE_Export ACE_Char_Codeset_Translator
{
public:
  virtual ~ACE_Char_Codeset_Translator () {};

  /// Read a single character from the stream, converting from the
  /// stream codeset to the native codeset
  virtual ACE_CDR::Boolean read_char (ACE_InputCDR&,
                                      ACE_CDR::Char&) = 0;

  /// Read a string from the stream, including the length, converting
  /// the characters from the stream codeset to the native codeset
  virtual ACE_CDR::Boolean read_string (ACE_InputCDR&,
                                        ACE_CDR::Char *&) = 0;

  /// Read an array of characters from the stream, converting the
  /// characters from the stream codeset to the native codeset.
  virtual ACE_CDR::Boolean read_char_array (ACE_InputCDR&,
                                            ACE_CDR::Char*,
                                            ACE_CDR::ULong) = 0;

  /// Write a single character to the stream, converting from the
  /// native codeset to the stream codeset
  virtual ACE_CDR::Boolean write_char (ACE_OutputCDR&,
                                       ACE_CDR::Char) = 0;

  /// Write a string to the stream, including the length, converting
  /// from the native codeset to the stream codeset
  virtual ACE_CDR::Boolean write_string (ACE_OutputCDR&,
                                         ACE_CDR::ULong,
                                         const ACE_CDR::Char*) = 0;

  /// Write an array of characters to the stream, converting from the
  /// native codeset to the stream codeset
  virtual ACE_CDR::Boolean write_char_array (ACE_OutputCDR&,
                                             const ACE_CDR::Char*,
                                             ACE_CDR::ULong) = 0;

  virtual ACE_CDR::ULong ncs () = 0;
  virtual ACE_CDR::ULong tcs () = 0;
protected:
  /// Children have access to low-level routines because they cannot
  /// use read_char or something similar (it would recurse).
  ACE_CDR::Boolean read_1 (ACE_InputCDR& input,
                           ACE_CDR::Octet *x);
  ACE_CDR::Boolean write_1 (ACE_OutputCDR& output,
                            const ACE_CDR::Octet *x);

  /// Efficiently read <length> elements of size <size> each from
  /// <input> into <x>; the data must be aligned to <align>.
  ACE_CDR::Boolean read_array (ACE_InputCDR& input,
                               void* x,
                               size_t size,
                               size_t align,
                               ACE_CDR::ULong length);

  /**
   * Efficiently write <length> elements of size <size> from <x> into
   * <output>. Before inserting the elements enough padding is added
   * to ensure that the elements will be aligned to <align> in the
   * stream.
   */
  ACE_CDR::Boolean write_array (ACE_OutputCDR& output,
                                const void *x,
                                size_t size,
                                size_t align,
                                ACE_CDR::ULong length);

  /**
   * Exposes the stream implementation of <adjust>, this is useful in
   * many cases to minimize memory allocations during marshaling.
   * On success <buf> will contain a contiguous area in the CDR stream
   * that can hold <size> bytes aligned to <align>.
   * Results
   */
  int adjust (ACE_OutputCDR& out,
              size_t size,
              size_t align,
              char *&buf);

  /// Used by derived classes to set errors in the CDR stream.
  void good_bit (ACE_OutputCDR& out, bool bit);

  /// Obtain the CDR Stream's major & minor version values.
  ACE_CDR::Octet major_version (ACE_InputCDR& input);
  ACE_CDR::Octet minor_version (ACE_InputCDR& input);
  ACE_CDR::Octet major_version (ACE_OutputCDR& output);
  ACE_CDR::Octet minor_version (ACE_OutputCDR& output);
};

// ****************************************************************

/**
 * @class ACE_WChar_Codeset_Translator
 *
 * @brief Codeset translation routines common to both Output and Input
 * CDR streams.
 *
 * This class is a base class for defining codeset translation
 * routines to handle the character set translations required by
 * both CDR Input streams and CDR Output streams.
 */
class ACE_Export ACE_WChar_Codeset_Translator
{
public:
  virtual ~ACE_WChar_Codeset_Translator () {}

  virtual ACE_CDR::Boolean read_wchar (ACE_InputCDR&,
                                       ACE_CDR::WChar&) = 0;
  virtual ACE_CDR::Boolean read_wstring (ACE_InputCDR&,
                                         ACE_CDR::WChar *&) = 0;
  virtual ACE_CDR::Boolean read_wchar_array (ACE_InputCDR&,
                                             ACE_CDR::WChar*,
                                             ACE_CDR::ULong) = 0;
  virtual ACE_CDR::Boolean write_wchar (ACE_OutputCDR&,
                                        ACE_CDR::WChar) = 0;
  virtual ACE_CDR::Boolean write_wstring (ACE_OutputCDR&,
                                          ACE_CDR::ULong,
                                          const ACE_CDR::WChar*) = 0;
  virtual ACE_CDR::Boolean write_wchar_array (ACE_OutputCDR&,
                                              const ACE_CDR::WChar*,
                                              ACE_CDR::ULong) = 0;

  virtual ACE_CDR::ULong ncs () = 0;
  virtual ACE_CDR::ULong tcs () = 0;
protected:
  /// Children have access to low-level routines because they cannot
  /// use read_char or something similar (it would recurse).
  ACE_CDR::Boolean read_1 (ACE_InputCDR& input,
                           ACE_CDR::Octet *x);
  ACE_CDR::Boolean read_2 (ACE_InputCDR& input,
                           ACE_CDR::UShort *x);
  ACE_CDR::Boolean read_4 (ACE_InputCDR& input,
                           ACE_CDR::ULong *x);
  ACE_CDR::Boolean write_1 (ACE_OutputCDR& output,
                            const ACE_CDR::Octet *x);
  ACE_CDR::Boolean write_2 (ACE_OutputCDR& output,
                            const ACE_CDR::UShort *x);
  ACE_CDR::Boolean write_4 (ACE_OutputCDR& output,
                            const ACE_CDR::ULong *x);

  /// Efficiently read <length> elements of size <size> each from
  /// <input> into <x>; the data must be aligned to <align>.
  ACE_CDR::Boolean read_array (ACE_InputCDR& input,
                               void* x,
                               size_t size,
                               size_t align,
                               ACE_CDR::ULong length);

  /**
   * Efficiently write <length> elements of size <size> from <x> into
   * <output>. Before inserting the elements enough padding is added
   * to ensure that the elements will be aligned to <align> in the
   * stream.
   */
  ACE_CDR::Boolean write_array (ACE_OutputCDR& output,
                                const void *x,
                                size_t size,
                                size_t align,
                                ACE_CDR::ULong length);

  /**
   * Exposes the stream implementation of <adjust>, this is useful in
   * many cases to minimize memory allocations during marshaling.
   * On success <buf> will contain a contiguous area in the CDR stream
   * that can hold <size> bytes aligned to <align>.
   * Results
   */
  int adjust (ACE_OutputCDR& out,
              size_t size,
              size_t align,
              char *&buf);

  /// Used by derived classes to set errors in the CDR stream.
  void good_bit (ACE_OutputCDR& out, bool bit);

  /// Obtain the CDR Stream's major & minor version values.
  ACE_CDR::Octet major_version (ACE_InputCDR& input);
  ACE_CDR::Octet minor_version (ACE_InputCDR& input);
  ACE_CDR::Octet major_version (ACE_OutputCDR& output);
  ACE_CDR::Octet minor_version (ACE_OutputCDR& output);

};

// @@ These operators should not be inlined since they force SString.h
//    to be included in this header.
extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os,
                                               const ACE_CString &x);

extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is,
                                               ACE_CString &x);


#if defined (__ACE_INLINE__)
# include "ace/CDR_Stream.inl"
#else /* __ACE_INLINE__ */

// Not used by CORBA or TAO
extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os,
                                               ACE_CDR::Char x);
// CDR output operators for primitive types

extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os,
                                               ACE_CDR::Short x);
extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os,
                                               ACE_CDR::UShort x);
extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os,
                                               ACE_CDR::Long x);
extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os,
                                               ACE_CDR::ULong x);
extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os,
                                               ACE_CDR::LongLong x);
extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os,
                                               ACE_CDR::ULongLong x);
extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR& os,
                                               ACE_CDR::LongDouble x);
extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os,
                                               ACE_CDR::Float x);
extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os,
                                               ACE_CDR::Double x);

// CDR output operator from helper classes

extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os,
                                               ACE_OutputCDR::from_boolean x);
extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os,
                                               ACE_OutputCDR::from_char x);
extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os,
                                               ACE_OutputCDR::from_wchar x);
extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os,
                                               ACE_OutputCDR::from_octet x);
extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os,
                                               ACE_OutputCDR::from_string x);
extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os,
                                               ACE_OutputCDR::from_wstring x);
extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os,
                                               const ACE_CDR::Char* x);
extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os,
                                               const ACE_CDR::WChar* x);

// Not used by CORBA or TAO
extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is,
                                               ACE_CDR::Char &x);
// CDR input operators for primitive types

extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is,
                                               ACE_CDR::Short &x);
extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is,
                                               ACE_CDR::UShort &x);
extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is,
                                               ACE_CDR::Long &x);
extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is,
                                               ACE_CDR::ULong &x);
extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is,
                                               ACE_CDR::LongLong &x);
extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is,
                                               ACE_CDR::ULongLong &x);
extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is,
                                               ACE_CDR::LongDouble &x);
extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is,
                                               ACE_CDR::Float &x);
extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is,
                                               ACE_CDR::Double &x);

// CDR input operator from helper classes

extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is,
                                               ACE_InputCDR::to_boolean x);
extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is,
                                               ACE_InputCDR::to_char x);
extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is,
                                               ACE_InputCDR::to_wchar x);
extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is,
                                               ACE_InputCDR::to_octet x);
extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is,
                                               ACE_InputCDR::to_string x);
extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is,
                                               ACE_InputCDR::to_wstring x);
extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is,
                                               ACE_CDR::Char*& x);
extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is,
                                               ACE_CDR::WChar*& x);

#endif /* __ACE_INLINE__ */

#include /**/ "ace/post.h"

#endif /* ACE_CDR_STREAM_H */