explode.hxx

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#ifndef INCLUDED_LOTUSWORDPRO_SOURCE_FILTER_EXPLODE_HXX
#define INCLUDED_LOTUSWORDPRO_SOURCE_FILTER_EXPLODE_HXX
 
#include <sal/types.h>
#include <memory>
 
class SvStream;
 
class HuffmanTreeNode
{
    std::unique_ptr<HuffmanTreeNode> left;
    std::unique_ptr<HuffmanTreeNode> right;
    sal_uInt32 value;
 
public:
    explicit HuffmanTreeNode(sal_uInt32 value = 0xffffffff);
    ~HuffmanTreeNode();
    HuffmanTreeNode* InsertNode(sal_uInt32 nValue, const char* pInCode);
    HuffmanTreeNode* QueryNode(const char* pCode);
    sal_uInt32 QueryValue(const char* pCode);
};
 
#define CHUNK 16384
#define MAXWIN 4096 /* maximum window size */
class Decompression
{
public:
    Decompression(SvStream* pInStream, SvStream* pOutStream);
    sal_Int32 explode();
    sal_uInt32 ReadBits(sal_uInt16 iCount, sal_uInt32& nBits);
    sal_uInt32 Decode(HuffmanTreeNode* pRoot);
 
private:
    SvStream* m_pInStream;
    SvStream* m_pOutStream;
 
    sal_uInt32 m_nCurrent4Byte; // bit buffer
    sal_uInt32 m_nBitsLeft; // number of bits remained in bit buffer
 
    sal_uInt8 m_Buffer[CHUNK]; // input byte buffer
    sal_uInt8* m_pBuffer; // pointer to input buffer
    sal_uInt32 m_nBytesLeft; // number of bytes remained in byte buffer
 
    sal_uInt8 m_Output[MAXWIN]; // output byte buffer
    sal_uInt32 m_nOutputBufferPos; // pointer to output buffer
 
    sal_uInt32 m_iArrayOfM[16];
 
    std::unique_ptr<HuffmanTreeNode> m_Tree1, m_Tree2;
 
    void ConstructTree1();
    void ConstructTree2();
    void fillArray();
    static void ToString(sal_uInt32 nBits, char* pChar, sal_uInt32 nLen);
};
#endif
 
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