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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. */
/* */
/**************************************************************************/
#ifndef CharCache_H
#define CharCache_H
//
// CharCache is a counterpart of IntCache that is
// optimized for use in compressing text composed
// of 8-bit characters.
//
class CharCache
{
public:
CharCache() : length_(0)
{
}
~CharCache()
{
}
unsigned int getSize() const
{
return (unsigned int) length_;
}
int lookup(unsigned char value, unsigned int &index);
//
// This can be inlined as it is only
// called by decodeCachedValue().
//
unsigned int get(unsigned int index)
{
unsigned char result = buffer_[index];
if (index != 0)
{
unsigned int i = index;
unsigned int target = (i >> 1);
do
{
buffer_[i] = buffer_[i - 1];
i--;
}
while (i > target);
buffer_[target] = result;
}
return (unsigned int) result;
}
void insert(unsigned char value);
private:
unsigned char length_;
unsigned char buffer_[7];
};
#endif /* CharCache_H */
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