Imported nxcomp-3.1.0-4.tar.gznxcomp/3.1.0-4

Summary: Imported nxcomp-3.1.0-4.tar.gz
Keywords:

Imported nxcomp-3.1.0-4.tar.gz
into Git repository

1 files changed, 296 insertions, 0 deletions

diff --git a/nxcomp/ShapeExtension.cpp b/nxcomp/ShapeExtension.cpp
new file mode 100755
index 000000000..f02545caa
--- /dev/null
+++ b/nxcomp/ShapeExtension.cpp
@@ -0,0 +1,296 @@
+/**************************************************************************/
+/*                                                                        */
+/* 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 "ShapeExtension.h"
+
+#include "ClientCache.h"
+
+#include "EncodeBuffer.h"
+#include "DecodeBuffer.h"
+
+#include "WriteBuffer.h"
+
+//
+// Set the verbosity level.
+//
+
+#define PANIC
+#define WARNING
+#undef  TEST
+#undef  DEBUG
+#undef  DUMP
+
+//
+// Constructors and destructors.
+//
+
+ShapeExtensionStore::ShapeExtensionStore(StaticCompressor *compressor)
+
+  : MessageStore(compressor)
+{
+  enableCache    = SHAPEEXTENSION_ENABLE_CACHE;
+  enableData     = SHAPEEXTENSION_ENABLE_DATA;
+  enableSplit    = SHAPEEXTENSION_ENABLE_SPLIT;
+  enableCompress = SHAPEEXTENSION_ENABLE_COMPRESS;
+
+  if (control -> isProtoStep7() == 1)
+  {
+    enableCompress = SHAPEEXTENSION_ENABLE_COMPRESS_IF_PROTO_STEP_7;
+  }
+
+  dataLimit  = SHAPEEXTENSION_DATA_LIMIT;
+  dataOffset = SHAPEEXTENSION_DATA_OFFSET;
+
+  cacheSlots          = SHAPEEXTENSION_CACHE_SLOTS;
+  cacheThreshold      = SHAPEEXTENSION_CACHE_THRESHOLD;
+  cacheLowerThreshold = SHAPEEXTENSION_CACHE_LOWER_THRESHOLD;
+
+  opcode_ = X_NXInternalShapeExtension;
+
+  messages_ -> resize(cacheSlots);
+
+  for (T_messages::iterator i = messages_ -> begin();
+           i < messages_ -> end(); i++)
+  {
+    *i = NULL;
+  }
+
+  temporary_ = NULL;
+}
+
+ShapeExtensionStore::~ShapeExtensionStore()
+{
+  for (T_messages::iterator i = messages_ -> begin();
+           i < messages_ -> end(); i++)
+  {
+    destroy(*i);
+  }
+
+  destroy(temporary_);
+}
+
+//
+// Here are the methods to handle messages' content.
+//
+
+int ShapeExtensionStore::encodeIdentity(EncodeBuffer &encodeBuffer, const unsigned char *buffer,
+                                            const unsigned int size, int bigEndian,
+                                                ChannelCache *channelCache) const
+{
+  //
+  // Handle this extension in a way similar to shape.
+  //
+
+  ClientCache *clientCache = (ClientCache *) channelCache;
+
+  #ifdef DEBUG
+  *logofs << name() << ": Encoding full message identity.\n" << logofs_flush;
+  #endif
+
+  //
+  // We handle all possible requests of this extension
+  // using the same opcode. We give to message a data
+  // offset of 4 (or 16 if proto is >= 3) and handle
+  // the first 16 bytes through an array of caches.
+  //
+
+  encodeBuffer.encodeValue(size >> 2, 16, 10);
+
+  encodeBuffer.encodeCachedValue(*(buffer + 1), 8,
+                     clientCache -> shapeOpcodeCache);
+
+  for (unsigned int i = 0; i < 8 && (i * 2 + 4) < size; i++)
+  {
+    encodeBuffer.encodeCachedValue(GetUINT(buffer + (i * 2) + 4, bigEndian), 16,
+                       *clientCache -> shapeDataCache[i]);
+  }
+
+  #ifdef DEBUG
+  *logofs << name() << ": Encoded full message identity.\n" << logofs_flush;
+  #endif
+
+  return 1;
+}
+
+int ShapeExtensionStore::decodeIdentity(DecodeBuffer &decodeBuffer, unsigned char *&buffer,
+                                            unsigned int &size, int bigEndian, WriteBuffer *writeBuffer,
+                                                ChannelCache *channelCache) const
+{
+  ClientCache *clientCache = (ClientCache *) channelCache;
+
+  #ifdef DEBUG
+  *logofs << name() << ": Decoding full message identity.\n" << logofs_flush;
+  #endif
+
+  decodeBuffer.decodeValue(size, 16, 10);
+
+  size <<= 2;
+
+  buffer = writeBuffer -> addMessage(size);
+
+  decodeBuffer.decodeCachedValue(*(buffer + 1), 8,
+                     clientCache -> shapeOpcodeCache);
+
+  unsigned int value;
+
+  for (unsigned int i = 0; i < 8 && (i * 2 + 4) < size; i++)
+  {
+    decodeBuffer.decodeCachedValue(value, 16,
+                       *clientCache -> shapeDataCache[i]);
+
+    PutUINT(value, buffer + 4 + (i * 2), bigEndian);
+  }
+
+  #ifdef DEBUG
+  *logofs << name() << ": Decoded full message identity.\n" << logofs_flush;
+  #endif
+
+  return 1;
+}
+
+int ShapeExtensionStore::parseIdentity(Message *message, const unsigned char *buffer,
+                                           unsigned int size, int bigEndian) const
+{
+  ShapeExtensionMessage *shapeExtension = (ShapeExtensionMessage *) message;
+
+  shapeExtension -> opcode = *(buffer + 1);
+
+  for (unsigned int i = 0; i < 8; i++)
+  {
+    if ((i * 2 + 4) < size)
+    {
+      shapeExtension -> data[i] = GetUINT(buffer + i * 2 + 4, bigEndian); 
+
+      #ifdef DEBUG
+      *logofs << name() << ": Parsed data[" << i << "].\n"
+              << logofs_flush;
+      #endif
+    }
+    else
+    {
+      shapeExtension -> data[i] = 0;
+    }
+  }
+
+  #ifdef DEBUG
+  *logofs << name() << ": Parsed identity for message at "
+          << this << ".\n" << logofs_flush;
+  #endif
+
+  return 1;
+}
+
+int ShapeExtensionStore::unparseIdentity(const Message *message, unsigned char *buffer,
+                                             unsigned int size, int bigEndian) const
+{
+  ShapeExtensionMessage *shapeExtension = (ShapeExtensionMessage *) message;
+
+  *(buffer + 1) = shapeExtension -> opcode;
+
+  for (unsigned int i = 0; i < 8 && (i * 2 + 4) < size; i++)
+  {
+    PutUINT(shapeExtension -> data[i], buffer + i * 2 + 4, bigEndian);
+  }
+
+  #ifdef DEBUG
+  *logofs << name() << ": Unparsed identity for message at "
+          << this << ".\n" << logofs_flush;
+  #endif
+
+  return 1;
+}
+
+void ShapeExtensionStore::dumpIdentity(const Message *message) const
+{
+  #ifdef DUMP
+
+  ShapeExtensionMessage *shapeExtension = (ShapeExtensionMessage *) message;
+
+  *logofs << name() << ": Identity opcode " << (unsigned) shapeExtension -> opcode;
+
+  for (int i = 0; i < 8; i++)
+  {
+    *logofs << ", data[" << i << "] " << shapeExtension -> data[i];
+  }
+
+  *logofs << ", size " << shapeExtension -> size_ << ".\n" << logofs_flush;
+
+  #endif
+}
+
+void ShapeExtensionStore::identityChecksum(const Message *message, const unsigned char *buffer,
+                                               unsigned int size, int bigEndian) const
+{
+  //
+  // Include minor opcode in the checksum. As data
+  // offset can be beyond the real end of message,
+  // we need to include size or we will match any
+  // message of size less or equal to data offset.
+  //
+
+  md5_append(md5_state_, buffer + 1,  3);
+}
+
+void ShapeExtensionStore::updateIdentity(EncodeBuffer &encodeBuffer, const Message *message,
+                                             const Message *cachedMessage,
+                                                 ChannelCache *channelCache) const
+{
+  //
+  // Encode the variant part.
+  //
+
+  ShapeExtensionMessage *shapeExtension       = (ShapeExtensionMessage *) message;
+  ShapeExtensionMessage *cachedShapeExtension = (ShapeExtensionMessage *) cachedMessage;
+
+  ClientCache *clientCache = (ClientCache *) channelCache;
+
+  for (int i = 0; i < 8 && (i * 2 + 4) < shapeExtension -> size_; i++)
+  {
+    #ifdef TEST
+    *logofs << name() << ": Encoding value " << shapeExtension -> data[i]
+            << " as data[" << i << "] field.\n" << logofs_flush;
+    #endif
+
+    encodeBuffer.encodeCachedValue((unsigned int) shapeExtension -> data[i], 16,
+                 *clientCache -> shapeDataCache[i]);
+
+    cachedShapeExtension -> data[i] = shapeExtension -> data[i];
+  }
+}
+
+void ShapeExtensionStore::updateIdentity(DecodeBuffer &decodeBuffer, const Message *message,
+                                             ChannelCache *channelCache) const
+{
+  ShapeExtensionMessage *shapeExtension = (ShapeExtensionMessage *) message;
+
+  ClientCache *clientCache = (ClientCache *) channelCache;
+
+  unsigned int value;
+
+  for (int i = 0; i < 8 && (i * 2 + 4) < shapeExtension -> size_; i++)
+  {
+    decodeBuffer.decodeCachedValue(value, 16,
+                 *clientCache -> shapeDataCache[i]);
+
+    shapeExtension -> data[i] = (unsigned short) value;
+
+    #ifdef TEST
+    *logofs << name() << ": Decoded value " << shapeExtension -> data[i]
+            << " as data[" << i << "] field.\n" << logofs_flush;
+    #endif
+  }
+}