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dsMmapStream.h

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/*
 * $Id: dsMmapStream.h,v 1.1 2003/09/11 08:46:41 dsamersoff Exp $
 */
#ifndef dsMmapStream_h
#define dsMmapStream_h

#include <iostream>
#include <stdlib.h>
#include <string.h>
#include <limits.h>

#include <dsMmap.h>

typedef void *(*p_alloc)(size_t);
typedef void (*p_free)(void *);

class dsMmapStreambuf : public std::streambuf 
{
    dsMmap *_map;

    std::streampos _seekoff_p(std::streamoff off, std::ios::seekdir dir);
    std::streampos _seekoff_g(std::streamoff off, std::ios::seekdir dir);

public:

   dsMmapStreambuf(const int fd, const size_t size, std::ios::openmode mode);
   dsMmapStreambuf(const char *fname, std::ios::openmode mode);

    virtual ~dsMmapStreambuf();

    size_t pcount();
    char *str();

    int overflow(int ch);
    int underflow();
    int pbackfail(int c);

    std::streampos seekoff(std::streamoff off, std::ios::seekdir dir, std::ios::openmode mode);
    std::streampos seekpos(std::streamoff off, std::ios::openmode mode){ return seekoff(off, std::ios::beg, mode); }

    void clear();

};

class dsMmapStream :  public std::iostream
{  
   dsMmapStreambuf* _sb;
   
  public:
   dsMmapStream(const int fd, const size_t size, std::ios::openmode mode=std::ios::in | std::ios::out);
   dsMmapStream(const char *fname, std::ios::openmode mode=std::ios::in | std::ios::out);

   virtual ~dsMmapStream();

   dsMmapStreambuf *rdbuf() const;

    size_t pcount(); 
    char *str(); 
         
    void clear();
};  

#endif

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