the begginning

utils/idbdatafile/UnbufferedFile.h

@@ -0,0 +1,64 @@
+/* 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_ */