From 3e924126b56c4d421e8263d25f6b14aa4ceed047 Mon Sep 17 00:00:00 2001
From: Reinhard Tartler <siretart@tauware.de>
Date: Sun, 13 Nov 2011 09:27:51 +0100
Subject: Imported nxcomp-3.1.0-4.tar.gz

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

Imported nxcomp-3.1.0-4.tar.gz
into Git repository
---
 nxcomp/BlockCacheSet.cpp | 135 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 135 insertions(+)
 create mode 100755 nxcomp/BlockCacheSet.cpp

(limited to 'nxcomp/BlockCacheSet.cpp')

diff --git a/nxcomp/BlockCacheSet.cpp b/nxcomp/BlockCacheSet.cpp
new file mode 100755
index 000000000..f6591d596
--- /dev/null
+++ b/nxcomp/BlockCacheSet.cpp
@@ -0,0 +1,135 @@
+/**************************************************************************/
+/*                                                                        */
+/* 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 <iostream.h>
+#include "BlockCacheSet.h"
+
+
+BlockCacheSet::BlockCacheSet(unsigned int numCaches):
+  caches_(new BlockCache *[numCaches]), size_(numCaches), 
+  length_(0)
+{
+  for (unsigned int i = 0; i < numCaches; i++)
+    caches_[i] = new BlockCache();
+}
+
+
+BlockCacheSet::~BlockCacheSet()
+{
+  //
+  // TODO: There is still a strange segfault occurring
+  // at random time under Cygwin, when proxy is being
+  // shutdown. Problem appeared just after upgrading
+  // to the latest version of the Cygwin DLL. A stack
+  // trace, obtained at the last minute, reveals that
+  // failure happens in this destructor.
+  //
+
+  #ifndef __CYGWIN32__
+
+  for (unsigned int i = 0; i < size_; i++)
+    delete caches_[i];
+  delete[]caches_;
+
+  #endif /* ifdef __CYGWIN32__ */
+}
+
+
+int
+BlockCacheSet::lookup(unsigned int dataLength, const unsigned char *data,
+		      unsigned int &index)
+{
+  unsigned int checksum = BlockCache::checksum(dataLength, data);
+  for (unsigned int i = 0; i < length_; i++)
+    if ((caches_[i]->getChecksum() == checksum) &&
+	(caches_[i]->compare(dataLength, data, 0)))
+    {
+      // match
+      index = i;
+      if (i)
+      {
+	BlockCache *save = caches_[i];
+	unsigned int target = (i >> 1);
+	do
+	{
+	  caches_[i] = caches_[i - 1];
+	  i--;
+	}
+	while (i > target);
+	caches_[target] = save;
+      }
+      return 1;
+    }
+  // no match
+  unsigned int insertionPoint = (length_ >> 1);
+  unsigned int start;
+  if (length_ >= size_)
+    start = size_ - 1;
+  else
+  {
+    start = length_;
+    length_++;
+  }
+  BlockCache *save = caches_[start];
+  for (unsigned int k = start; k > insertionPoint; k--)
+    caches_[k] = caches_[k - 1];
+  caches_[insertionPoint] = save;
+  save->set(dataLength, data);
+  return 0;
+}
+
+
+void
+BlockCacheSet::get(unsigned index, unsigned int &size,
+		   const unsigned char *&data)
+{
+  size = caches_[index]->getLength();
+  data = caches_[index]->getData();
+  if (index)
+  {
+    BlockCache *save = caches_[index];
+    unsigned int target = (index >> 1);
+    do
+    {
+      caches_[index] = caches_[index - 1];
+      index--;
+    }
+    while (index > target);
+    caches_[target] = save;
+  }
+}
+
+
+
+void
+BlockCacheSet::set(unsigned int dataLength, const unsigned char *data)
+{
+  unsigned int insertionPoint = (length_ >> 1);
+  unsigned int start;
+  if (length_ >= size_)
+    start = size_ - 1;
+  else
+  {
+    start = length_;
+    length_++;
+  }
+  BlockCache *save = caches_[start];
+  for (unsigned int k = start; k > insertionPoint; k--)
+    caches_[k] = caches_[k - 1];
+  caches_[insertionPoint] = save;
+  save->set(dataLength, data);
+}
-- 
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