input_from_buffer.cpp

Go to the documentation of this file.

/******************************************************************************
 *   Copyright (C) 2013-2014 by Alexander Rykovanov                        *
 *   rykovanov.as@gmail.com                                                   *
 *                                                                            *
 *   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; version 3 of the License.     *
 *                                                                            *
 *   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.,                                          *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.                *
 ******************************************************************************/

#include <opc/ua/protocol/input_from_buffer.h>

#include <stdexcept>
#include <cstring>
#include <algorithm>

namespace OpcUa
{

InputFromBuffer::InputFromBuffer(const char * buf, std::size_t bufSize)
  : Buffer(buf)
  , Size(bufSize)
{
  if (!Buffer) { throw std::invalid_argument("InputFromBuffer: Input buffer cannot be empty."); }

  if (!bufSize) { throw std::invalid_argument("InputFromBuffer: Invalid size of buffer"); }
}

std::size_t InputFromBuffer::Receive(char * data, std::size_t size)
{
  if (Size == 0)
    {
      return 0;
    }

  const std::size_t sizeToRead = std::min(Size, size);
  memcpy(data, Buffer, sizeToRead);
  Size -= sizeToRead;
  Buffer += sizeToRead;
  return sizeToRead;
}

size_t InputFromBuffer::GetRemainSize() const
{
  return Size;
}

}