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#ifndef INCLUDED_BOBCAT_IFDSTREAMBUF_
#define INCLUDED_BOBCAT_IFDSTREAMBUF_

#include <streambuf>

namespace FBB
{    

class IFdStreambuf: public std::streambuf
{
    public:
            // Mode defines what to do with the file descriptor at
            // destruction-time or when the default open is
            // called. CLOSE_FD will close the fd, KEEP_FD will leave the
            // fd as-is. When open is called with a Mode argument, then
            // the provided argument is used for the actual fd. The Mode
            // specified at the constructor is therefore only used for the
            // mode-less open() call and for the destructor.
        enum Mode
        {
            CLOSE_FD,
            KEEP_FD,
        };

    private:
        Mode        d_mode;
        int         d_fd;
        size_t      d_n;
        char*       d_buffer;

    public:
        IFdStreambuf();
        explicit IFdStreambuf(Mode mode);
        explicit IFdStreambuf(int fd, size_t n = 1);
        IFdStreambuf(int fd, Mode mode, size_t n = 1);

        IFdStreambuf(IFdStreambuf const &other) = delete;

        ~IFdStreambuf();

        IFdStreambuf &operator=(IFdStreambuf const &other) = delete;

        void close();                                           // .f

        void open(int xfd, Mode mode, size_t n = 1);
        void open(int xfd, size_t n = 1);                       // .f
        
        int fd() const;                                         // .f

    private:
        virtual int underflow();
        virtual std::streamsize xsgetn(char *dest, std::streamsize n);

        void cleanup(Mode mode);
};

inline void IFdStreambuf::open(int xfd, size_t n)
{
    open(xfd, d_mode, n);
}
inline void IFdStreambuf::close()
{
    cleanup(CLOSE_FD);
}
inline int IFdStreambuf::fd() const
{
    return d_fd;
}

} // FBB

#endif