UnbufferedFile.h

/* Copyright (C) 2014 InfiniDB, Inc.

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License
   as published by the Free Software Foundation; version 2 of
   the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
   MA 02110-1301, USA. */

#ifndef UNBUFFEREDFILE_H_
#define UNBUFFEREDFILE_H_

#include <stdexcept>
#include <unistd.h>
#include <boost/utility.hpp>

#include "IDBDataFile.h"

namespace idbdatafile
{

/**
 * UnbufferedFile implements the IDBDataFile for I/O to a standand kernel
 * fd (via open, write, read, etc.).  See IDBDataFile.h for more documentation
 * on member functions.
 */
class UnbufferedFile : public IDBDataFile, boost::noncopyable
{
public:
	UnbufferedFile(const char* fname, const char* mode, unsigned opts);
	/* virtual */ ~UnbufferedFile();

	/* virtual */ ssize_t pread(void *ptr, off64_t offset, size_t count);
	/* virtual */ ssize_t read(void *ptr, size_t count);
	/* virtual */ ssize_t write(const void *ptr, size_t count);
	/* virtual */ int seek(off64_t offset, int whence);
	/* virtual */ int truncate(off64_t length);
	/* virtual */ off64_t size();
	/* virtual */ off64_t tell();
	/* virtual */ int flush();
	/* virtual */ time_t mtime();

protected:
	/* virtual */ int close();

private:
#ifdef _MSC_VER
	HANDLE m_fd;
#else
	int	m_fd;
#endif
};

}

#endif /* UNBUFFEREDFILE_H_ */