MemReadFile.h

#pragma once
#include "IFile.h"

namespace ParaEngine
{
    class CMemReadFile :
        public IReadFile
    {
    public:
        CMemReadFile(void);
        CMemReadFile(const char * filename);
        CMemReadFile(IReadFile* pFile, DWORD nSize);
        /* zip buffer
        * @param buffer: 
        * @param nSize: size in byte of the buffer
        * @param bDeleteBuffer: true if the zip file will take the ownership of the buffer and will delete it on exit.
        */
        CMemReadFile(byte* buffer, DWORD nSize, bool bDeleteBuffer=true);

        virtual ~CMemReadFile(void);

        virtual DWORD read(void* buffer, DWORD sizeToRead);

        virtual bool seek(DWORD finalPos, bool relativeMovement = false);

        virtual DWORD getSize(){return m_CacheEndPos - m_CacheStartPos;};

        virtual bool isOpen(){return m_CacheData!=0;};

        virtual DWORD getPos(){return m_curPos;};

        virtual const char* getFileName(){return "MemReadFile";};

        virtual void Release(){delete this;};

        byte* getBuffer();
    private:
        DWORD   m_CacheStartPos;
        DWORD   m_CacheEndPos;
        DWORD   m_curPos;
        byte*   m_CacheData;
        bool    m_bOwnBuffer;

        void Unload();
    };

}