XMemFile.h

// XMemFile.h: interface for the CXFile class.
//
//////////////////////////////////////////////////////////////////////
 
#if !defined(CXMEMFILE_INCLUDE_H)
#define CXMEMFILE_INCLUDE_H
 
#ifdef _MSC_VER
#pragma once
#endif // _MSC_VER
 
#include "XFile.h"
 
BEGIN_MOOTOOLS_NAMESPACE
 
    ////////////////////////////////////////////////////////////////////////////////////////////////
    // CXMemFile class
    //
    class DLL_TOOLSFUNCTION CXMemFile : public CXFile
    {
        DECLARE_DYNAMIC_XOBJECT(CXMemFile)
 
    protected:
        typedef enum
        {
            DefaultGrowSize = 2048,
        } Constants;
 
    public:
        // Constructors
        explicit CXMemFile(unsigned int nGrowBytes = DefaultGrowSize, bool allowException = true);
        CXMemFile(const unsigned char *lpBuffer, fileuint nBufferSize, bool deleteMemory, bool allowException = true);
 
    public:
        virtual ~CXMemFile();
    #ifdef _DEBUG
        virtual void Dump() const;
    #endif
 
        virtual fileuint GetPosition() const;
        virtual fileuint Seek(longint offset, CXFile::SeekPosition nFrom);
        virtual bool SetLength(fileuint dwNewLen);
        virtual unsigned int Read(void* buffer, unsigned int maxByteToRead);
        virtual void Write(const void* buffer, unsigned int byteToWrite);
 
        virtual void Abort();
        virtual void Flush();
        virtual void Close();
 
        virtual fileuint GetLength() const;
 
        // Buffer access
        void Attach(const unsigned char *lpBuffer, fileuint nBufferSize, bool deleteMemory); // The memory is considered as read only if deleteMemory = false
        const unsigned char *GetBuffer() const { return buffer; };
        unsigned char *Detach(); // Detach buffer from the file (which become empty)
 
        static unsigned char *Alloc(SIZET nBytes);
        static void Free(unsigned char *lpMem);
 
    protected:
        SIZET growCount;
        SIZET bufferSize, fileSize, filePosition;
        unsigned char *buffer;
        bool deleteBuffer, sendException;
 
        void InitMemFile();
        virtual SIZET BufferCommand(unsigned int bufferCommand, SIZET nCount = 0, unsigned char **ppBufStart = NULL, unsigned char **ppBufMax = NULL);
 
        // Memory allocation
        unsigned char *Realloc(unsigned char *lpMem, SIZET nBytes);
        unsigned char *Memcpy(unsigned char *lpMemTarget, const unsigned char *lpMemSource, SIZET nBytes);
        void Free();
        
        virtual bool GrowBuffer(SIZET dwNewLen);
    };
 
END_MOOTOOLS_NAMESPACE
 
#endif // !defined(CXMEMFILE_INCLUDE_H)