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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 DecodeBuffer_H
#define DecodeBuffer_H
#include <string.h>
#include "IntCache.h"
#include "CharCache.h"
#include "XidCache.h"
#include "FreeCache.h"
#include "OpcodeCache.h"
#include "ActionCache.h"
#include "ActionCacheCompat.h"
#include "PositionCacheCompat.h"
#define DECODE_BUFFER_OVERFLOW_SIZE 4194304
#define DECODE_BUFFER_POSTFIX_SIZE 1
class DecodeBuffer
{
public:
DecodeBuffer(const unsigned char *data, unsigned int length);
~DecodeBuffer()
{
}
int decodeValue(unsigned int &value, unsigned int numBits,
unsigned int blockSize = 0, int endOkay = 0);
int decodeCachedValue(unsigned int &value, unsigned int numBits,
IntCache &cache, unsigned int blockSize = 0,
int endOkay = 0);
int decodeCachedValue(unsigned char &value, unsigned int numBits,
CharCache &cache, unsigned int blockSize = 0,
int endOkay = 0);
void decodeDiffCachedValue(unsigned int &value, unsigned int &previous,
unsigned int numBits, IntCache &cache,
unsigned int blockSize = 0)
{
decodeCachedValue(value, numBits, cache, blockSize);
previous += (value + 1);
previous &= (0xffffffff >> (32 - numBits));
value = previous;
}
void decodeBoolValue(unsigned int &value)
{
decodeValue(value, 1);
}
int decodeOpcodeValue(unsigned char &value, OpcodeCache &cache, int endOkay = 0)
{
int result = decodeCachedValue(value, 8, cache.base_[cache.slot_], 8, endOkay);
if (result == 1)
{
cache.slot_ = value;
}
return result;
}
void decodeActionValue(unsigned char &value, unsigned short &position,
ActionCache &cache);
void decodeNewXidValue(unsigned int &value, unsigned int &lastId,
IntCache &lastIdCache, IntCache &cache,
FreeCache &freeCache);
void decodeNewXidValue(unsigned int &value, unsigned int &lastId,
IntCache &lastIdCache, XidCache &cache,
FreeCache &freeCache);
void decodeXidValue(unsigned int &value, XidCache &cache);
void decodeFreeXidValue(unsigned int &value, FreeCache &cache);
void decodeActionValueCompat(unsigned char &value, ActionCacheCompat &cache)
{
decodeCachedValue(value, 2, cache.base_[cache.slot_]);
cache.slot_ = value;
}
void decodePositionValueCompat(short int &value, PositionCacheCompat &cache);
void decodeTextData(unsigned char *buffer, unsigned int numBytes)
{
decodeMemory(buffer, numBytes);
}
void decodeIntData(unsigned char *buffer, unsigned int numBytes)
{
decodeMemory(buffer, numBytes);
}
void decodeLongData(unsigned char *buffer, unsigned int numBytes)
{
decodeMemory(buffer, numBytes);
}
const unsigned char *decodeMemory(unsigned int numBytes);
void decodeMemory(unsigned char *buffer, unsigned int numBytes)
{
memcpy(buffer, decodeMemory(numBytes), numBytes);
}
private:
const unsigned char *buffer_;
const unsigned char *end_;
const unsigned char *nextSrc_;
unsigned char srcMask_;
};
#endif /* DecodeBuffer_H */
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