MemoryMappedFile.h

// $Id: MemoryMappedFile.h 21 2010-09-05 04:18:17Z cschwarz1 $

#ifndef BASE_MEMORYMAPPEDFILE_H
#define BASE_MEMORYMAPPEDFILE_H

#include "File.h"

namespace base {

    class PPBASE_EXPORT MemoryMappedFile {
    public:
        MemoryMappedFile();


        MemoryMappedFile(const File &file, bool writeable = false, bool privt = false);

        ~MemoryMappedFile();


        unsigned getLength() const;


        char *getStart() const;


        char *map(const File &file, bool writeable = false, bool privt = false);


        char *map(const File &file, u_longlong_t offset, unsigned length, bool writeable = false, bool privt = false);

        void unmap();

    private:
    #ifdef _WIN32
        HANDLE    _handle;  
    #else
        int       _fd;      
    #endif
        String    _fname;   
        unsigned  _length;  
        void     *_start;   

        DISALLOW_COPY_CONSTRUCTOR_AND_ASSIGNMENT(MemoryMappedFile);
    };
}

#endif