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/**************************************************************************/
/* */
/* Copyright (c) 2001, 2011 NoMachine (http://www.nomachine.com) */
/* Copyright (c) 2008-2017 Oleksandr Shneyder <o.shneyder@phoca-gmbh.de> */
/* Copyright (c) 2014-2022 Ulrich Sibiller <uli42@gmx.de> */
/* Copyright (c) 2014-2019 Mihai Moldovan <ionic@ionic.de> */
/* Copyright (c) 2011-2022 Mike Gabriel <mike.gabriel@das-netzwerkteam.de>*/
/* Copyright (c) 2015-2016 Qindel Group (http://www.qindel.com) */
/* */
/* NXCOMP, NX protocol compression and NX extensions to this software */
/* are copyright of the aforementioned persons and companies. */
/* */
/* Redistribution and use of the present software is allowed according */
/* to terms specified in the file LICENSE.nxcomp which comes in the */
/* source distribution. */
/* */
/* All rights reserved. */
/* */
/* NOTE: This software has received contributions from various other */
/* contributors, only the core maintainers and supporters are listed as */
/* copyright holders. Please contact us, if you feel you should be listed */
/* as copyright holder, as well. */
/* */
/**************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "Misc.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.
//
#if !(defined(__CYGWIN__) || defined(__CYGWIN32__))
for (unsigned int i = 0; i < size_; i++)
delete caches_[i];
delete[]caches_;
#endif /* if !(defined(__CYGWIN__) || defined(__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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