//------------------------------------------------------------------------------
// ioutils.cpp
//------------------------------------------------------------------------------
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
// 02110-1301  USA
//
//------------------------------------------------------------------------------
// Copyright (C) 2012 "Zalewa" <zalewapl@gmail.com>
//------------------------------------------------------------------------------
#include "ioutils.h"

bool IOUtils::copy(QIODevice &src, QIODevice &dst, unsigned long long maxCount, unsigned bufferSize)
{
	if (bufferSize > maxCount)
	{
		bufferSize = maxCount;
	}

	QByteArray buffer = src.read(bufferSize);
	unsigned long long copiedCount = 0;
	while (!buffer.isEmpty() && copiedCount < maxCount)
	{
		if (dst.write(buffer) != buffer.size())
		{
			return false;
		}

		copiedCount += buffer.size();
		if (copiedCount < maxCount)
		{
			unsigned long long nextRead = bufferSize;
			unsigned long long remainingData = maxCount - copiedCount;
			if (nextRead > remainingData)
			{
				nextRead = remainingData;
			}
			buffer = src.read(nextRead);
		}
	}

	return true;
}
