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/*=========================================================================
*
* Copyright Insight Software Consortium
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#ifndef GDCMBASEPDU_H
#define GDCMBASEPDU_H
#include "gdcmTypes.h"
namespace gdcm
{
namespace network
{
/**
* \brief BasePDU
* \details base class for PDUs
*
* all PDUs start with the first ten bytes as specified:
* 01 PDU type
* 02 reserved
* 3-6 PDU Length (unsigned)
* 7-10 variable
*
* on some, 7-10 are split (7-8 as protocol version in Associate-RQ, for instance,
* while associate-rj splits those four bytes differently).
*
* Also common to all the PDUs is their ability to read and write to a stream.
*
* So, let's just get them all bunched together into one (abstract) class, shall we?
*
* Why?
* 1) so that the ULEvent can have the PDU stored in it, since the event takes PDUs and not
* other class structures (other class structures get converted into PDUs)
* 2) to make reading PDUs in the event loop cleaner
*/
class BasePDU
{
public:
virtual ~BasePDU() = default;
virtual std::istream &Read(std::istream &is) = 0;
virtual const std::ostream &Write(std::ostream &os) const = 0;
virtual size_t Size() const = 0;
virtual void Print(std::ostream &os) const = 0;
virtual bool IsLastFragment() const = 0;
};
} // end namespace network
} // end namespace gdcm
#endif // GDCMBASEPDU_H
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