OW_BaseStreamBuffer.hpp

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#ifndef OW_BASESTREAMBUFFER_HPP_INCLUDE_GUARD_
#define OW_BASESTREAMBUFFER_HPP_INCLUDE_GUARD_
#include "OW_config.h"

#ifdef OW_HAVE_STREAMBUF
#include <streambuf>
#else
#include <streambuf.h>
#endif

// The classes and functions defined in this file are not meant for general
// use, they are internal implementation details.  They may change at any time.

namespace OW_NAMESPACE
{

const size_t BASE_BUF_SIZE = 256;
const size_t HTTP_BUF_SIZE = 4096;
class OW_COMMON_API BaseStreamBuffer : public std::streambuf
{
public:
   BaseStreamBuffer(size_t bufSize = BASE_BUF_SIZE,
         const char* direction = "io");
   ~BaseStreamBuffer();
protected:
   // for input
   int underflow();
   //int pbackfail(int c);
   // for output
   std::streamsize xsputn(const char* s, std::streamsize n);
   virtual int overflow(int c);
   virtual int sync();
   virtual void initBuffers();
   virtual void initGetBuffer();
   virtual void initPutBuffer();
   // meant to be overwritten (at least one of them)
   virtual int buffer_to_device(const char* c, int n);
   
   virtual int buffer_from_device(char* c, int n);
private:
   std::streamsize m_bufSize;
   char* m_inputBuffer;
   char* m_outputBuffer;
   int buffer_in();
   int buffer_out();
   // prohibit copying and assigning
   // NO IMPLEMENTATION
   BaseStreamBuffer(const BaseStreamBuffer& arg);
   BaseStreamBuffer& operator=(const BaseStreamBuffer& arg);
};

} // end namespace OW_NAMESPACE

#endif

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