MappedIOStream.h

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#ifndef MAPPEDIOSTREAM_H_
#define MAPPEDIOSTREAM_H_

#include "IOStream.h"

#include <cstdio>
#include <sys/stat.h>

class MappedIOStream : public IOStream
{
public:

    MappedIOStream( const Str& filename, bool clobber, size_t chunkSize );

    virtual ~MappedIOStream();

    void close();

    virtual IOStream& read( char* buffer, size_t num );

    bool seek( unsigned int location );

    virtual bool eof();

    bool isReadable()
    {
        return NULL != ptr_;
    }

    const char* getName()
    {
        return filename_.cStr();
    }

    const Str& getFilename()
    {
        return filename_;
    }

    const struct stat getStat();

    IOStream& write( const char* buffer, size_t num );

    virtual IOStream& write( const char* buffer )
    {
        return write( buffer, strlen( buffer ) );
    }

    int tell();

    void flush();

    bool open( bool clobber );

    bool isWritable()
    {
        return NULL != ptr_;
    }

protected:

    bool checkSize( size_t num );

    int file_;
    Str filename_;
    size_t chunkSize_;
    size_t size_;
    unsigned char* ptr_;
    size_t pos_; // for ftell and sequential output

private:
    // Note that the copy constructor below is private and not given a body.
    // Any attempt to call it will return a compiler error.
    MappedIOStream( const MappedIOStream& old ); // disallow copy constructor
};

#endif /*MAPPEDIOSTREAM_H_*/