summaryrefslogtreecommitdiff
path: root/TAO/tao/CDR_Encaps_Codec.cpp
blob: 211a9cb1d7c006ea3504cf3d4ca3b07e28052547 (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
// -*- C++ -*-
//
// $Id$

#include "CDR.h"
#include "OctetSeqC.h"
#include "Any.h"
#include "Typecode.h"
#include "Marshal.h"

#include "CDR_Encaps_Codec.h"

ACE_RCSID (TAO_CodecFactory,
           CDR_Encaps_Codec,
           "$Id$")


TAO_CDR_Encaps_Codec::TAO_CDR_Encaps_Codec (CORBA::Octet major,
					    CORBA::Octet minor)
  : major_ (major),
    minor_ (minor)
{
}

TAO_CDR_Encaps_Codec::~TAO_CDR_Encaps_Codec (void)
{
}

CORBA::OctetSeq *
TAO_CDR_Encaps_Codec::encode (const CORBA::Any & data,
			      CORBA::Environment &ACE_TRY_ENV)
  ACE_THROW_SPEC ((CORBA::SystemException,
		   IOP::Codec::InvalidTypeForEncoding))
{
  this->check_type_for_encoding (data,
				 ACE_TRY_ENV);
  ACE_CHECK_RETURN (0);

  // ----------------------------------------------------------------

  TAO_OutputCDR cdr;
  if ((cdr << TAO_OutputCDR::from_boolean (TAO_ENCAP_BYTE_ORDER))
      && (cdr << data))
    {
      CORBA::OctetSeq * octet_seq = 0;

      ACE_NEW_THROW_EX (octet_seq,
                        CORBA::OctetSeq,
                        CORBA::NO_MEMORY (
                          CORBA_SystemException::_tao_minor_code (
                            TAO_DEFAULT_MINOR_CODE,
                            ENOMEM),
                          CORBA::COMPLETED_NO));
      ACE_CHECK_RETURN (0);

      CORBA::OctetSeq_var safe_octet_seq = octet_seq;

      octet_seq->length (cdr.total_length ());
      CORBA::Octet *buf = octet_seq->get_buffer ();

      for (const ACE_Message_Block *i = cdr.begin ();
           i != 0;
           i = i->cont ())
        {
          size_t len = i->length ();
          ACE_OS_String::memcpy (buf, i->rd_ptr (), len);
          buf += len;
        }

      return safe_octet_seq._retn ();
    }

  ACE_THROW_RETURN (CORBA::MARSHAL (), 0);
}

CORBA::Any *
TAO_CDR_Encaps_Codec::decode (const CORBA::OctetSeq & data,
			      CORBA::Environment &ACE_TRY_ENV)
  ACE_THROW_SPEC ((CORBA::SystemException,
		   IOP::Codec::FormatMismatch))
{
  // @todo How do we check for a format mismatch so that we can throw
  //       a IOP::Codec::FormatMismatch exception?
  // @todo Is this the best way to extract the Any from the OctetSeq?

  // Notice that we need to extract the TypeCode and the value from
  // the octet sequence, and place them into the Any.  We can't just
  // insert the octet sequence into the Any.

  TAO_InputCDR cdr (ACE_reinterpret_cast (const char*,
                                          data.get_buffer ()),
                    data.length ());

  CORBA::Boolean byte_order;
  if (cdr >> TAO_InputCDR::to_boolean (byte_order))
    {
      cdr.reset_byte_order (ACE_static_cast (int, byte_order));

      CORBA::Any * any = 0;
      ACE_NEW_THROW_EX (any,
                        CORBA::Any,
                        CORBA::NO_MEMORY (
                          CORBA_SystemException::_tao_minor_code (
                           TAO_DEFAULT_MINOR_CODE,
                           ENOMEM),
                          CORBA::COMPLETED_NO));
      ACE_CHECK_RETURN (0);

      CORBA::Any_var safe_any = any;

      if (cdr >> (*any))
        return safe_any._retn ();
    }

  ACE_THROW_RETURN (IOP::Codec::FormatMismatch (), 0);
}

CORBA::OctetSeq *
TAO_CDR_Encaps_Codec::encode_value (const CORBA::Any & data,
				    CORBA::Environment &ACE_TRY_ENV)
  ACE_THROW_SPEC ((CORBA::SystemException,
		   IOP::Codec::InvalidTypeForEncoding))
{
  this->check_type_for_encoding (data,
				 ACE_TRY_ENV);
  ACE_CHECK_RETURN (0);

  // ----------------------------------------------------------------
  TAO_OutputCDR cdr;

  if ((cdr << TAO_OutputCDR::from_boolean (TAO_ENCAP_BYTE_ORDER)))
    {
      CORBA::TypeCode_var tc = data.type ();

      TAO_InputCDR input (data._tao_get_cdr (),
                          data._tao_byte_order ());

      TAO_Marshal_Object::perform_append (tc.in (),
                                          &input,
                                          &cdr,
                                          ACE_TRY_ENV);
      ACE_CHECK_RETURN (0);

      // TAO extension: replace the contents of the octet sequence with
      // the CDR stream.
      CORBA::OctetSeq * octet_seq = 0;

      ACE_NEW_THROW_EX (octet_seq,
                        CORBA::OctetSeq,
                        CORBA::NO_MEMORY (
                          CORBA_SystemException::_tao_minor_code (
                            TAO_DEFAULT_MINOR_CODE,
                            ENOMEM),
                          CORBA::COMPLETED_NO));
      ACE_CHECK_RETURN (0);

      CORBA::OctetSeq_var safe_octet_seq = octet_seq;

      octet_seq->length (cdr.total_length ());
      CORBA::Octet *buf = octet_seq->get_buffer ();

      for (const ACE_Message_Block *i = cdr.begin ();
           i != 0;
           i = i->cont ())
        {
          size_t len = i->length ();
          ACE_OS_String::memcpy (buf, i->rd_ptr (), len);
          buf += len;
        }

      return safe_octet_seq._retn ();
    }

  ACE_THROW_RETURN (CORBA::MARSHAL (), 0);  
}

CORBA::Any *
TAO_CDR_Encaps_Codec::decode_value (const CORBA::OctetSeq & data,
				    CORBA::TypeCode_ptr tc,
				    CORBA::Environment &ACE_TRY_ENV)
  ACE_THROW_SPEC ((CORBA::SystemException,
		   IOP::Codec::FormatMismatch,
		   IOP::Codec::TypeMismatch))
{
  // @todo How do we check for a type mismatch so that we can
  //       throw a IOP::Codec::TypeMismatch exception?
  //       @@ I added a check below.  See the comment.  I'm not sure
  //          if it is a valid check.
  //             -Ossama

  // @todo Most of this code was copied from
  //         operator>> (TAO_InputCDR &cdr, CORBA::Any &x)
  //       in Any.cpp.  Rather than copy the code, the code should be
  //       refactored to make it possible to use the given TypeCode
  //       rather than attempt to extract it from the CDR
  //       encapsulation.

  CORBA::ULong sequence_length = data.length ();
  TAO_InputCDR cdr (ACE_reinterpret_cast (const char*,
                                          data.get_buffer ()),
                    sequence_length);

  CORBA::Boolean byte_order;
  if (cdr >> TAO_InputCDR::to_boolean (byte_order))
    {
      cdr.reset_byte_order (ACE_static_cast (int, byte_order));

      // @@ (JP) The following code depends on the fact that
      //         TAO_InputCDR does not contain chained message blocks,
      //         otherwise <begin> and <end> could be part of
      //         different buffers!

      // This will be the start of a new message block.
      char *begin = cdr.rd_ptr ();

      // Skip over the next argument.
      CORBA::TypeCode::traverse_status status =
        TAO_Marshal_Object::perform_skip (tc, &cdr, ACE_TRY_ENV);
      ACE_CHECK_RETURN (0);  // @@ Should we throw a
                             //    IOP::Codec::TypeMismatch exception
                             //    here if this fails?

      if (status == CORBA::TypeCode::TRAVERSE_CONTINUE)
        {
          // This will be the end of the new message block.
          char *end = cdr.rd_ptr ();

          size_t size = end - begin;

          // @@ I added the following check, but I'm not sure if it is
          //    a valid check.  Can someone verify this?
          //          -Ossama

          // If the unaligned buffer size is not equal to the octet
          // sequence length (minus the "byte order byte") then the
          // TypeCode does not correspond to the data in the CDR
          // encapsulation.  However, even if they do match it is
          // still uncertain if the TypeCode corresponds to the data
          // in the octet sequence.  With this test, it is only
          // possible to determine if the TypeCode does *not* match
          // the data, not if it does match.
          if (size != sequence_length - 1)
            ACE_THROW_RETURN (IOP::Codec::TypeMismatch (), 0);

          ACE_Message_Block mb (size + ACE_CDR::MAX_ALIGNMENT);
          ACE_CDR::mb_align (&mb);
          ptr_arith_t offset =
            ptr_arith_t (begin) % ACE_CDR::MAX_ALIGNMENT;
          mb.rd_ptr (offset);
          mb.wr_ptr (offset + size);

          ACE_OS::memcpy (mb.rd_ptr (), begin, size);

          CORBA::Any * any = 0;
          ACE_NEW_THROW_EX (any,
                            CORBA::Any,
                            CORBA::NO_MEMORY (
                              CORBA_SystemException::_tao_minor_code (
                                TAO_DEFAULT_MINOR_CODE,
                                ENOMEM),
                              CORBA::COMPLETED_NO));
          ACE_CHECK_RETURN (0);

          CORBA::Any_var safe_any = any;

          // Stick it into the Any.  It gets duplicated there.
          any->_tao_replace (tc,
                             cdr.byte_order (),
                             &mb);

          return safe_any._retn ();
        }
      else
        ACE_THROW_RETURN (IOP::Codec::TypeMismatch (), 0);
    }

  ACE_THROW_RETURN (IOP::Codec::FormatMismatch (), 0);
}

void
TAO_CDR_Encaps_Codec::check_type_for_encoding (
  const CORBA::Any & data,
  CORBA::Environment &ACE_TRY_ENV)
{
  // @@ TODO: Are there any other conditions we need to check?

  CORBA::TypeCode_var typecode = data.type ();
  if (this->major_ == 1
      && this->minor_ == 0
      && typecode->equivalent (CORBA::_tc_wstring))
    ACE_THROW (IOP::Codec::InvalidTypeForEncoding ());
}