/*

 * Copyright 2013-2022 Step Function I/O, LLC

 *

 * Licensed to Green Energy Corp (www.greenenergycorp.com) and Step Function I/O

 * LLC (https://stepfunc.io) under one or more contributor license agreements.

 * See the NOTICE file distributed with this work for additional information

 * regarding copyright ownership. Green Energy Corp and Step Function I/O LLC license

 * this file to you 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

 *

 * 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.

 */

#include "HeaderWriter.h"

#include <ser4cpp/serialization/LittleEndian.h>

#include <cassert>

namespace opendnp3

{

HeaderWriter::HeaderWriter(ser4cpp::wseq_t* position_) : position(position_) {}

size_t HeaderWriter::Remaining() const

{

    return position->length();

}

void HeaderWriter::Mark()

{

    mark.set(*position);

}

bool HeaderWriter::Rollback()

{

    if (mark.is_set())

    {

        *position = mark.get();

        mark.clear();

        return true;

    }

    return false;

}

bool HeaderWriter::WriteHeader(GroupVariationID id, QualifierCode qc)

{

    if (position->length() < 3)

    {

        return false;

    }

    ser4cpp::UInt8::write_to(*position, id.group);

    ser4cpp::UInt8::write_to(*position, id.variation);

    ser4cpp::UInt8::write_to(*position, QualifierCodeSpec::to_type(qc));

    return true;

}

bool HeaderWriter::WriteHeaderWithReserve(GroupVariationID id, QualifierCode qc, size_t reserve)

{

    return (position->length() < (3 + reserve)) ? false : WriteHeader(id, qc);

}

} // namespace opendnp3