GxZlib.h

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//===========================================================================
//===========================================================================
#pragma once
 
GX_CORE_NAMESPACE_BEGIN()
 
//===========================================================================
//===========================================================================
class GxZlib
{
    //-------------------------------
    //-------------------------------
public:
    static constexpr u32 DECODE_BUFFER_SIZE   = GxMath::VALUE_64K;
    static constexpr u32 ENCODE_LEVEL_DEFAULT = 7;
    static constexpr u32 ENCODE_LEVEL_MAX     = 9;
    static constexpr u32 FOURCC_CODE_ZLIB     = GX_FOURCC('Z','L','I','B');
 
    enum class RESULT
    {
        CANCELED    = -2,   
        ERROR_      = -1,   
        OK          = 0     
    };
 
    struct GxEncodeHeader
    {
        u32                 _fourCC;                                
        u32                 _decodeSize;                            
        u32                 _encodeSize;                            
        u32                 _encodeLevel;                           
    };
 
    //-------------------------------
    //-------------------------------
public:
    GxZlib(void);
    ~GxZlib(void);
 
    //-------------------------------
    //-------------------------------
public:
    RESULT decode(GxStreamReader& reader, void* pOutput, u32 outputSize);
    RESULT decode(GxStreamReader& reader, GxMemoryStream* pOutput, b32 isAppend = false);
    RESULT encode(GxStreamWriter& writer, void* pInput, u32 inputSize, u32 level = ENCODE_LEVEL_DEFAULT);
    RESULT encode(GxStreamWriter& writer, GxMemoryStream* pInput, u32 level = ENCODE_LEVEL_DEFAULT);
    void   cancel(void);
    void   clear(void);
 
    //-------------------------------
    //-------------------------------
public:
    static b32 getEncodeHeader(GxEncodeHeader& dst, const void* pSrc);
    static b32 getEncodeHeader(GxEncodeHeader& dst, const GxStreamReader& reader);
 
    static b32 readHeader(GxEncodeHeader& dst, GxStreamReader* pStreamReader);
    static void* createDecoderHandle(u32 chunkSizeByte);
    static b32 decodeByHandle(void* pHandle, GxStreamReader* pStreamReader, void* pOutput, u32 outputSize, u32& encodeSize);
    static b32 deleteDecoderHandle(void* pHandle);
 
    //-------------------------------
    //-------------------------------
private:
    b32                     _isRequestCancel;                       
 
};
 
GX_CORE_NAMESPACE_END()