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/**************************************************************************/
/* */
/* 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. */
/* */
/**************************************************************************/
#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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