#pragma once
#include <stdint.h>

class CFileBase
{
public:
    enum OpenFlags
    {
        modeRead = 0x0000,
        modeWrite = 0x0001,
        modeReadWrite = 0x0002,
        shareCompat = 0x0000,
        shareExclusive = 0x0010,
        shareDenyWrite = 0x0020,
        shareDenyRead = 0x0030,
        shareDenyNone = 0x0040,
        modeNoInherit = 0x0080,
        modeCreate = 0x1000,
        modeNoTruncate = 0x2000,
    };

    enum SeekPosition 
	{ 
		begin = 0x0, 
		current = 0x1, 
		end = 0x2 
	};

    virtual bool Open(const char * lpszFileName, uint32_t nOpenFlags ) = 0;

    virtual uint32_t GetPosition() const = 0;
    virtual int32_t Seek(int32_t lOff, SeekPosition nFrom) = 0;
    virtual bool SetLength(uint32_t dwNewLen) = 0;
    virtual uint32_t GetLength() const = 0;

    virtual uint32_t Read(void* lpBuf, uint32_t nCount) = 0;
    virtual bool Write(const void* lpBuf, uint32_t nCount) = 0;

    virtual bool Flush() = 0;
    virtual bool Close() = 0;
    virtual bool IsOpen() const = 0;
    virtual bool SetEndOfFile() = 0;
};

class CFile : public CFileBase
{
    // Attributes
    void *  m_hFile;
    bool    m_bCloseOnDelete;

public:
    // Flag values

    // Constructors
    CFile();
    CFile(void * hFile);
    CFile(const char * lpszFileName, uint32_t nOpenFlags);

    // Deconstructors
    virtual ~CFile();

    // Operations
    virtual bool Open(const char * lpszFileName, uint32_t nOpenFlags );

    uint32_t SeekToEnd   ( void );
    void  SeekToBegin ( void );

    // Overridable
    virtual uint32_t GetPosition() const;
    virtual int32_t Seek(int32_t lOff, SeekPosition nFrom);
    virtual bool SetLength(uint32_t dwNewLen);
    virtual uint32_t GetLength() const;

    virtual uint32_t Read(void* lpBuf, uint32_t nCount);
    virtual bool Write(const void* lpBuf, uint32_t nCount);

    virtual bool Flush();
    virtual bool Close();
    virtual bool IsOpen() const;
    virtual bool SetEndOfFile();

private:
    CFile(const CFile&);
    CFile& operator=(const CFile&);
};