Program Listing for File SerializedPayload.h

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// Copyright 2016 Proyectos y Sistemas de Mantenimiento SL (eProsima).
//
// 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
//
// 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 _FASTDDS_RTPS_SERIALIZEDPAYLOAD_H_
#define _FASTDDS_RTPS_SERIALIZEDPAYLOAD_H_
#include <fastrtps/fastrtps_dll.h>
#include <fastdds/rtps/common/Types.h>
#include <cstring>
#include <new>
#include <stdexcept>
#include <stdint.h>
#include <stdlib.h>

namespace eprosima {
namespace fastrtps {
namespace rtps {

//Pre define data encapsulation schemes
#define CDR_BE 0x0000
#define CDR_LE 0x0001
#define PL_CDR_BE 0x0002
#define PL_CDR_LE 0x0003

#if FASTDDS_IS_BIG_ENDIAN_TARGET
#define DEFAULT_ENCAPSULATION CDR_LE
#define PL_DEFAULT_ENCAPSULATION PL_CDR_BE
#else
#define DEFAULT_ENCAPSULATION CDR_LE
#define PL_DEFAULT_ENCAPSULATION PL_CDR_LE
#endif  // FASTDDS_IS_BIG_ENDIAN_TARGET

struct RTPS_DllAPI SerializedPayload_t
{
    static constexpr size_t representation_header_size = 4u;

    uint16_t encapsulation;
    uint32_t length;
    octet* data;
    uint32_t max_size;
    uint32_t pos;

    SerializedPayload_t()
        : encapsulation(CDR_BE)
        , length(0)
        , data(nullptr)
        , max_size(0)
        , pos(0)
    {
    }

    explicit SerializedPayload_t(
            uint32_t len)
        : SerializedPayload_t()
    {
        this->reserve(len);
    }

    ~SerializedPayload_t()
    {
        this->empty();
    }

    bool operator == (
            const SerializedPayload_t& other) const
    {
        return ((encapsulation == other.encapsulation) &&
               (length == other.length) &&
               (0 == memcmp(data, other.data, length)));
    }

    bool copy(
            const SerializedPayload_t* serData,
            bool with_limit = true)
    {
        length = serData->length;

        if (serData->length > max_size)
        {
            if (with_limit)
            {
                return false;
            }
            else
            {
                this->reserve(serData->length);
            }
        }
        encapsulation = serData->encapsulation;
        if (length == 0)
        {
            return true;
        }
        memcpy(data, serData->data, length);
        return true;
    }

    bool reserve_fragmented(
            SerializedPayload_t* serData)
    {
        length = serData->length;
        max_size = serData->length;
        encapsulation = serData->encapsulation;
        data = (octet*)calloc(length, sizeof(octet));
        return true;
    }

    void empty()
    {
        length = 0;
        encapsulation = CDR_BE;
        max_size = 0;
        if (data != nullptr)
        {
            free(data);
        }
        data = nullptr;
    }

    void reserve(
            uint32_t new_size)
    {
        if (new_size <= this->max_size)
        {
            return;
        }
        if (data == nullptr)
        {
            data = (octet*)calloc(new_size, sizeof(octet));
            if (!data)
            {
                throw std::bad_alloc();
            }
        }
        else
        {
            void* old_data = data;
            data = (octet*)realloc(data, new_size);
            if (!data)
            {
                free(old_data);
                throw std::bad_alloc();
            }
            memset(data + max_size, 0, (new_size - max_size) * sizeof(octet));
        }
        max_size = new_size;
    }

};

} /* namespace rtps */
} /* namespace fastrtps */
} /* namespace eprosima */

#endif /* _FASTDDS_RTPS_SERIALIZEDPAYLOAD_H_ */