athena/include/LZ77/LZBase.hpp

#pragma once

#include <string>
#include "LZ77/LZLookupTable.hpp"

class LZBase
{
public:
    explicit LZBase(atInt32 minimumOffset = 1, atInt32 slidingWindow = 4096, atInt32 minimumMatch = 3, atInt32 blockSize = 8);
    virtual ~LZBase() {}

    virtual atUint32 compress(const atUint8* src, atUint8** dest, atUint32 srcLength) = 0;
    virtual atUint32 decompress(const atUint8* src, atUint8** dest, atUint32 srcLength) = 0;

    void setSlidingWindow(atInt32 SlidingWindow);
    atInt32 slidingWindow();
    void setReadAheadBuffer(atInt32 ReadAheadBuffer);
    atInt32 readAheadBuffer();
    void setMinMatch(atInt32 minimumMatch);
    atInt32 minMatch();
    void setBlockSize(atInt32 BlockSize);
    atInt32 blockSize();
    void setMinimumOffset(atUint32 minimumOffset);
    atUint32 minimumOffset();


private:

    atInt32 subMatch(const atUint8* str1, const uint8_t* str2, const atInt32 len);
    LZLengthOffset windowSearch(atUint8* beginSearchPtr, atUint8* searchPosPtr, atUint8* endLABufferPtr, atUint8* startLBPtr);
protected:
    LZLengthOffset search(atUint8* posPtr, atUint8* dataBegin, atUint8* dataEnd);

    atInt32 m_slidingWindow;
    atInt32 m_readAheadBuffer;
    atInt32 m_minMatch;//Minimum number of bytes that have to matched to go through with compression
    atInt32 m_blockSize;
    atUint32 m_minOffset;
    LZLookupTable m_lookupTable;

};