aboutsummaryrefslogtreecommitdiff
path: root/nxcomp/CreateGC.cpp
blob: 92ad73f6aec99bd5de9c23a69fd65f3b049bbc51 (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
/**************************************************************************/
/*                                                                        */
/* Copyright (c) 2001, 2007 NoMachine, http://www.nomachine.com/.         */
/*                                                                        */
/* NXCOMP, NX protocol compression and NX extensions to this software     */
/* are copyright of NoMachine. Redistribution and use of the present      */
/* software is allowed according to terms specified in the file LICENSE   */
/* which comes in the source distribution.                                */
/*                                                                        */
/* Check http://www.nomachine.com/licensing.html for applicability.       */
/*                                                                        */
/* NX and NoMachine are trademarks of NoMachine S.r.l.                    */
/*                                                                        */
/* All rights reserved.                                                   */
/*                                                                        */
/**************************************************************************/

#include "CreateGC.h"

#include "ClientCache.h"

#include "EncodeBuffer.h"
#include "DecodeBuffer.h"

//
// Set the verbosity level.
//

#define PANIC
#define WARNING
#undef  TEST
#undef  DEBUG
#undef  DUMP

//
// Here are the methods to handle messages' content.
//

int CreateGCStore::parseIdentity(Message *message, const unsigned char *buffer,
                                     unsigned int size, int bigEndian) const
{
  CreateGCMessage *createGC = (CreateGCMessage *) message;

  //
  // Here is the fingerprint.
  //

  createGC -> gcontext   = GetULONG(buffer + 4, bigEndian);
  createGC -> drawable   = GetULONG(buffer + 8, bigEndian);
  createGC -> value_mask = GetULONG(buffer + 12, bigEndian);

  //
  // Clear the unused bytes carried in the
  // payload to increase the effectiveness
  // of the caching algorithm.
  //

  if ((int) size > dataOffset)
  {
    #ifdef DEBUG
    *logofs << name() << ": Removing unused bytes from the "
            << "data payload.\n" << logofs_flush;
    #endif

    createGC -> value_mask &= (1 << 23) - 1;

    unsigned int mask = 0x1;
    unsigned char *source = (unsigned char *) buffer + CREATEGC_DATA_OFFSET;
    unsigned long value = 0;

    for (unsigned int i = 0; i < 23; i++)
    {
      if (createGC -> value_mask & mask)
      {
        value = GetULONG(source, bigEndian);

        value &= (0xffffffff >> (32 - CREATEGC_FIELD_WIDTH[i]));

        PutULONG(value, source, bigEndian);

        source += 4;
      }

      mask <<= 1;
    }
  }

  #ifdef DEBUG
  *logofs << name() << ": Parsed identity for message at "
          << this << ".\n" << logofs_flush;
  #endif

  return 1;
}

int CreateGCStore::unparseIdentity(const Message *message, unsigned char *buffer,
                                       unsigned int size, int bigEndian) const
{
  CreateGCMessage *createGC = (CreateGCMessage *) message;

  //
  // Fill all the message's fields.
  //

  PutULONG(createGC -> gcontext,   buffer + 4, bigEndian);
  PutULONG(createGC -> drawable,   buffer + 8, bigEndian);
  PutULONG(createGC -> value_mask, buffer + 12, bigEndian);

  #ifdef DEBUG
  *logofs << name() << ": Unparsed identity for message at "
          << this << ".\n" << logofs_flush;
  #endif

  return 1;
}

void CreateGCStore::dumpIdentity(const Message *message) const
{
  #ifdef DUMP

  CreateGCMessage *createGC = (CreateGCMessage *) message;

  *logofs << name() << ": Identity gcontext " << createGC -> gcontext << ", drawable "
                    << createGC -> drawable << ", value_mask " << createGC -> value_mask
                    << ", size " << createGC -> size_ << ".\n" << logofs_flush;
  #endif
}

void CreateGCStore::identityChecksum(const Message *message, const unsigned char *buffer,
                                         unsigned int size, int bigEndian) const
{
  //
  // This didn't include the drawable
  // in previous versions.
  //

  md5_append(md5_state_, buffer + 8, 8);
}

void CreateGCStore::updateIdentity(EncodeBuffer &encodeBuffer, const Message *message,
                                       const Message *cachedMessage,
                                           ChannelCache *channelCache) const
{
  CreateGCMessage *createGC       = (CreateGCMessage *) message;
  CreateGCMessage *cachedCreateGC = (CreateGCMessage *) cachedMessage;

  ClientCache *clientCache = (ClientCache *) channelCache;

  if (control -> isProtoStep7() == 1)
  {
    #ifdef TEST
    *logofs << name() << ": Encoding value " << createGC -> gcontext
            << " as gcontext field.\n" << logofs_flush;
    #endif

    encodeBuffer.encodeNewXidValue(createGC -> gcontext, clientCache -> lastId,
                       clientCache -> lastIdCache, clientCache -> gcCache,
                           clientCache -> freeGCCache);

    cachedCreateGC -> gcontext = createGC -> gcontext;
  }
  else
  {
    #ifdef TEST
    *logofs << name() << ": Encoding value " << createGC -> drawable
            << " as drawable field.\n" << logofs_flush;
    #endif

    encodeBuffer.encodeXidValue(createGC -> drawable, clientCache -> drawableCache);

    cachedCreateGC -> drawable = createGC -> drawable;

    #ifdef TEST
    *logofs << name() << ": Encoding value " << createGC -> gcontext
            << " as gcontext field.\n" << logofs_flush;
    #endif

    encodeBuffer.encodeXidValue(createGC -> gcontext, clientCache -> gcCache);

    cachedCreateGC -> gcontext = createGC -> gcontext;
  }
}

void CreateGCStore::updateIdentity(DecodeBuffer &decodeBuffer, const Message *message,
                                       ChannelCache *channelCache) const
{
  CreateGCMessage *createGC = (CreateGCMessage *) message;

  ClientCache *clientCache = (ClientCache *) channelCache;

  unsigned int value;

  if (control -> isProtoStep7() == 1)
  {
    decodeBuffer.decodeNewXidValue(value, clientCache -> lastId,
                       clientCache -> lastIdCache, clientCache -> gcCache,
                           clientCache -> freeGCCache);

    createGC -> gcontext = value;

    #ifdef TEST
    *logofs << name() << ": Decoded value " << createGC -> gcontext
            << " as gcontext field.\n" << logofs_flush;
    #endif
  }
  else
  {
    decodeBuffer.decodeXidValue(value, clientCache -> drawableCache);

    createGC -> drawable = value;

    #ifdef TEST
    *logofs << name() << ": Decoded value " << createGC -> drawable
            << " as drawable field.\n" << logofs_flush;
    #endif

    decodeBuffer.decodeXidValue(value, clientCache -> gcCache);

    createGC -> gcontext = value;

    #ifdef TEST
    *logofs << name() << ": Decoded value " << createGC -> gcontext
            << " as gcontext field.\n" << logofs_flush;
    #endif
  }
}