OW_TmpFile.hpp

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#ifndef OW_TMPFILE_HPP_INCLUDE_GUARD_
#define OW_TMPFILE_HPP_INCLUDE_GUARD_
#include "OW_config.h"
#include "OW_IntrusiveReference.hpp"
#include "OW_IntrusiveCountableBase.hpp"
#include "OW_String.hpp"
#ifdef OW_HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef OW_WIN32
#include <io.h>
#endif

namespace OW_NAMESPACE
{

class OW_COMMON_API TmpFileImpl : public IntrusiveCountableBase
{
public:
   TmpFileImpl();
   TmpFileImpl(String const& filename);
   ~TmpFileImpl();
   size_t read(void* bfr, size_t numberOfBytes, long offset=-1L);
   size_t write(const void* bfr, size_t numberOfBytes, long offset=-1L);

#ifdef OW_WIN32
   int seek(long offset, int whence=SEEK_SET);
   long tell();
   void rewind();
   int flush();
#else
   int seek(long offset, int whence=SEEK_SET)
      { return ::lseek(m_hdl, offset, whence); }
   long tell() { return ::lseek(m_hdl, 0, SEEK_CUR); }
   void rewind() { ::lseek(m_hdl, 0, SEEK_SET); }
   int flush() { return 0; }
#endif

   void newFile() { open(); }
   long getSize();
   String releaseFile();
private:
   void open();
   int close();
   TmpFileImpl(const TmpFileImpl& arg);   // Not implemented
   TmpFileImpl& operator= (const TmpFileImpl& arg);   // Not implemented
   char* m_filename;
#ifndef OW_WIN32
   int m_hdl;
#else
   HANDLE m_hdl;
#endif
};

class OW_COMMON_API TmpFile
{
public:
   TmpFile() :
      m_impl(new TmpFileImpl) {  }
   TmpFile(String const& filename)
      : m_impl(new TmpFileImpl(filename))
   {}
   TmpFile(const TmpFile& arg) :
      m_impl(arg.m_impl) {}
   TmpFile& operator= (const TmpFile& arg)
   {
      m_impl = arg.m_impl;
      return *this;
   }
   ~TmpFile()  {  }
   size_t read(void* bfr, size_t numberOfBytes, long offset=-1L)
   {
      return m_impl->read(bfr, numberOfBytes, offset);
   }
   size_t write(const void* bfr, size_t numberOfBytes, long offset=-1L)
   {
      return m_impl->write(bfr, numberOfBytes, offset);
   }
   int seek(long offset, int whence=SEEK_SET)
      { return m_impl->seek(offset, whence); }
   long tell() { return m_impl->tell(); }
   void rewind() { m_impl->rewind(); }
   int flush() { return m_impl->flush(); }
   void newFile() { m_impl->newFile(); }
   long getSize() { return m_impl->getSize(); }
   String releaseFile() { return m_impl->releaseFile(); }
private:

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

   IntrusiveReference<TmpFileImpl> m_impl;

#ifdef OW_WIN32
#pragma warning (pop)
#endif

};

} // end namespace OW_NAMESPACE

#endif

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