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/**************************************************************************/
/* */
/* Copyright (c) 2001, 2009 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 Medialogic S.p.A. */
/* */
/* All rights reserved. */
/* */
/**************************************************************************/
#ifndef IntCache_H
#define IntCache_H
class IntCache
{
public:
IntCache(unsigned int size);
~IntCache()
{
delete [] buffer_;
}
unsigned int getSize() const
{
return length_;
}
int lookup(unsigned int &value, unsigned int &index,
unsigned int mask, unsigned int &sameDiff);
//
// This can be inlined as it is only
// called by decodeCachedValue().
//
unsigned int get(unsigned int index)
{
unsigned int result = buffer_[index];
if (index != 0)
{
//
// Using a memmove() appears to be slower.
//
// unsigned int target = index >> 1;
//
// memmove((char *) &buffer_[target + 1], (char *) &buffer_[target],
// sizeof(unsigned int) * (index - target));
//
// buffer_[target] = result;
//
unsigned int i = index;
unsigned int target = (i >> 1);
do
{
buffer_[i] = buffer_[i - 1];
i--;
}
while (i > target);
buffer_[target] = result;
}
return result;
}
void insert(unsigned int &value, unsigned int mask);
void push(unsigned int &value, unsigned int mask);
void dump();
unsigned int getLastDiff(unsigned int mask) const
{
return lastDiff_;
}
unsigned int getBlockSize(unsigned int bits) const
{
if (bits > 0)
{
return (predictedBlockSize_ < bits ? predictedBlockSize_ : bits);
}
return predictedBlockSize_;
}
private:
unsigned int size_;
unsigned int length_;
unsigned int *buffer_;
unsigned int lastDiff_;
unsigned int lastValueInserted_;
unsigned int predictedBlockSize_;
};
#endif /* IntCache_H */
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