booster/streambuf.h

#ifndef BOOSTER_STREAMBUF_H
#define BOOSTER_STREAMBUF_H

#include <booster/config.h>
#include <streambuf>
#include <stdio.h>
#include <booster/hold_ptr.h>
#include <memory>
#include <vector>

namespace booster {


        class io_device {
        public:
                typedef enum {
                        set, 
                        cur, 
                        end  
                } pos_type;

                virtual size_t read(char * /*pos*/,size_t /*length*/)
                {
                        return 0;
                }
                virtual size_t write(char const * /*pos*/,size_t /*length*/)
                {
                        return 0;
                }
                virtual long long seek(long long /*position*/,pos_type /*pos*/ = set)
                {
                        return -1;
                }
                virtual ~io_device()
                {
                }
        };

        class BOOSTER_API streambuf : public std::streambuf {
        public:

                streambuf();
                ~streambuf();
                
                void device(std::auto_ptr<io_device> d);
                void device(io_device &d);

                void reset_device();

                io_device &device();
                void set_buffer_size(size_t n);

        protected:

                // Seek

                virtual std::streampos seekoff( std::streamoff off,
                                                std::ios_base::seekdir way,
                                                std::ios_base::openmode m = std::ios_base::in | std::ios_base::out);
                virtual std::streampos seekpos( std::streampos pos,
                                                std::ios_base::openmode m = std::ios_base::in | std::ios_base::out);
                
                // Get
                
                virtual int underflow();
                virtual int pbackfail(int c = EOF);

                // Put
                
                virtual int overflow(int c = EOF);
                virtual int sync();
                
        private:

                std::vector<char> buffer_out_;
                std::vector<char> buffer_in_;

                size_t buffer_size_;

                struct _data;
                hold_ptr<_data> d; // for future use

                std::auto_ptr<io_device> device_auto_ptr_;
                io_device *device_;

        };
} // booster


#endif