1 files changed, 131 insertions, 0 deletions
diff --git a/nxcomp/ChangeGCCompat.cpp b/nxcomp/ChangeGCCompat.cpp
new file mode 100755
index 000000000..532202d41
--- /dev/null
+++ b/nxcomp/ChangeGCCompat.cpp
@@ -0,0 +1,131 @@
+/**************************************************************************/
+/*                                                                        */
+/* 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 "ChangeGCCompat.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 ChangeGCCompatStore::parseIdentity(Message *message, const unsigned char *buffer,
+                                           unsigned int size, int bigEndian) const
+{
+  ChangeGCCompatMessage *changeGC = (ChangeGCCompatMessage *) message;
+
+  //
+  // Here is the fingerprint.
+  //
+
+  changeGC -> gcontext   = GetULONG(buffer + 4, bigEndian);
+  changeGC -> value_mask = GetULONG(buffer + 8, 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
+
+    changeGC -> value_mask &= (1 << 23) - 1;
+
+    unsigned int mask = 0x1;
+    unsigned char *source = (unsigned char *) buffer + CHANGEGC_DATA_OFFSET;
+    unsigned long value = 0;
+
+    for (unsigned int i = 0; i < 23; i++)
+    {
+      if (changeGC -> 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 ChangeGCCompatStore::unparseIdentity(const Message *message, unsigned char *buffer,
+                                             unsigned int size, int bigEndian) const
+{
+  ChangeGCCompatMessage *changeGC = (ChangeGCCompatMessage *) message;
+
+  //
+  // Fill all the message's fields.
+  //
+
+  PutULONG(changeGC -> gcontext,   buffer + 4, bigEndian);
+  PutULONG(changeGC -> value_mask, buffer + 8, bigEndian);
+
+  #ifdef DEBUG
+  *logofs << name() << ": Unparsed identity for message at "
+          << this << ".\n" << logofs_flush;
+  #endif
+
+  return 1;
+}
+
+void ChangeGCCompatStore::dumpIdentity(const Message *message) const
+{
+  #ifdef DUMP
+
+  ChangeGCCompatMessage *changeGC = (ChangeGCCompatMessage *) message;
+
+  *logofs << name() << ": Identity gcontext " << changeGC -> gcontext 
+                    << ", mask " << changeGC -> value_mask << ", size "
+                    << changeGC -> size_ << ".\n" << logofs_flush;
+  #endif
+}
+
+void ChangeGCCompatStore::identityChecksum(const Message *message, const unsigned char *buffer,
+                                               unsigned int size, int bigEndian) const
+{
+  md5_append(md5_state_, buffer + 4, 8);
+}