OW_TempFileStream.hpp

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#ifndef OW_TEMPFILESTREAM_HPP_INCLUDE_GUARD_
#define OW_TEMPFILESTREAM_HPP_INCLUDE_GUARD_
#include "OW_config.h"
#include "OW_Types.hpp"
#include "OW_String.hpp"
#include "OW_AutoPtr.hpp"
#include "OW_CommonFwd.hpp"

#if defined(OW_HAVE_STREAMBUF)
#include <streambuf>
#elif defined(OW_HAVE_STREAMBUF_H)
#include <streambuf.h>
#endif

#if defined(OW_HAVE_ISTREAM) && defined(OW_HAVE_OSTREAM)
#include <istream>
#include <ostream>
#else
#include <iostream>
#endif

namespace OW_NAMESPACE
{

class OW_COMMON_API TempFileBuffer : public std::streambuf
{
public:
   TempFileBuffer(size_t bufSize);
   TempFileBuffer(String const& filename, size_t bufSize);
   ~TempFileBuffer();
   std::streamsize getSize();
   void rewind();
   void reset();
   String releaseFile();
   bool usingTempFile() const;
protected:
   // for input
   int underflow();
   // for output
   std::streamsize xsputn(const char* s, std::streamsize n);
   virtual int overflow(int c);
   //virtual int sync();
   void initBuffers();
   void initGetBuffer();
   void initPutBuffer();
   int buffer_to_device(const char* c, int n);
   int buffer_from_device(char* c, int n);
private:
   size_t m_bufSize;
   char* m_buffer;
   TmpFile* m_tempFile;
   std::streamsize m_readPos;
   std::streamsize m_writePos;
   bool m_isEOF;
   int buffer_in();
   int buffer_out();
   // prohibit copying and assigning
   TempFileBuffer(const TempFileBuffer& arg);
   TempFileBuffer& operator=(const TempFileBuffer& arg);
};
class OW_COMMON_API TempFileStream : public std::iostream
{
public:
   TempFileStream(size_t bufSize = 4096);
   TempFileStream(String const& filename, size_t bufSize = 4096);
   std::streamsize getSize() { return m_buffer->getSize(); }
   void rewind();
   void reset();
   String releaseFile();
   bool usingTempFile() const;
private:

#ifdef OW_WIN32
#pragma warning (push)
#pragma warning (disable: 4251)
#endif

   AutoPtr<TempFileBuffer> m_buffer;

#ifdef OW_WIN32
#pragma warning (pop)
#endif

   // disallow copying and assigning
   TempFileStream(const TempFileStream&);
   TempFileStream& operator=(const TempFileStream&);
};

} // end namespace OW_NAMESPACE

#endif

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