blobPubSubTypes.cpp

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// License: Apache 2.0. See LICENSE file in root directory.
// Copyright(c) 2023 Intel Corporation. All Rights Reserved.
 
#include <fastcdr/FastBuffer.h>
#include <fastcdr/Cdr.h>
 
#include <realdds/topics/blob/blobPubSubTypes.h>
 
using SerializedPayload_t = eprosima::fastrtps::rtps::SerializedPayload_t;
using InstanceHandle_t = eprosima::fastrtps::rtps::InstanceHandle_t;
 
namespace udds {
    blobPubSubType::blobPubSubType()
    {
        setName("udds::blob");
        auto type_size = blob::getMaxCdrSerializedSize();
        type_size += eprosima::fastcdr::Cdr::alignment(type_size, 4); /* possible submessage alignment */
        m_typeSize = static_cast<uint32_t>(type_size) + 4; /*encapsulation*/
        m_isGetKeyDefined = blob::isKeyDefined();
        size_t keyLength = blob::getKeyMaxCdrSerializedSize() > 16 ?
                blob::getKeyMaxCdrSerializedSize() : 16;
        m_keyBuffer = reinterpret_cast<unsigned char*>(malloc(keyLength));
        memset(m_keyBuffer, 0, keyLength);
    }
 
    blobPubSubType::~blobPubSubType()
    {
        if (m_keyBuffer != nullptr)
        {
            free(m_keyBuffer);
        }
    }
 
    bool blobPubSubType::serialize(
            void* data,
            SerializedPayload_t* payload)
    {
        blob* p_type = static_cast<blob*>(data);
 
        // Object that manages the raw buffer.
        eprosima::fastcdr::FastBuffer fastbuffer(reinterpret_cast<char*>(payload->data), payload->max_size);
        // Object that serializes the data.
        eprosima::fastcdr::Cdr ser(fastbuffer, eprosima::fastcdr::Cdr::DEFAULT_ENDIAN, eprosima::fastcdr::Cdr::DDS_CDR);
        payload->encapsulation = ser.endianness() == eprosima::fastcdr::Cdr::BIG_ENDIANNESS ? CDR_BE : CDR_LE;
        // Serialize encapsulation
        ser.serialize_encapsulation();
 
        try
        {
            // Serialize the object.
            p_type->serialize(ser);
        }
        catch (eprosima::fastcdr::exception::NotEnoughMemoryException& /*exception*/)
        {
            return false;
        }
 
        // Get the serialized length
        payload->length = static_cast<uint32_t>(ser.getSerializedDataLength());
        return true;
    }
 
    bool blobPubSubType::deserialize(
            SerializedPayload_t* payload,
            void* data)
    {
        try
        {
            //Convert DATA to pointer of your type
            blob* p_type = static_cast<blob*>(data);
 
            // Object that manages the raw buffer.
            eprosima::fastcdr::FastBuffer fastbuffer(reinterpret_cast<char*>(payload->data), payload->length);
 
            // Object that deserializes the data.
            eprosima::fastcdr::Cdr deser(fastbuffer, eprosima::fastcdr::Cdr::DEFAULT_ENDIAN, eprosima::fastcdr::Cdr::DDS_CDR);
 
            // Deserialize encapsulation.
            deser.read_encapsulation();
            payload->encapsulation = deser.endianness() == eprosima::fastcdr::Cdr::BIG_ENDIANNESS ? CDR_BE : CDR_LE;
 
            // Deserialize the object.
            p_type->deserialize(deser);
        }
        catch (eprosima::fastcdr::exception::NotEnoughMemoryException& /*exception*/)
        {
            return false;
        }
 
        return true;
    }
 
    std::function<uint32_t()> blobPubSubType::getSerializedSizeProvider(
            void* data)
    {
        return [data]() -> uint32_t
               {
                   return static_cast<uint32_t>(type::getCdrSerializedSize(*static_cast<blob*>(data))) +
                          4u /*encapsulation*/;
               };
    }
 
    void* blobPubSubType::createData()
    {
        return reinterpret_cast<void*>(new blob());
    }
 
    void blobPubSubType::deleteData(
            void* data)
    {
        delete(reinterpret_cast<blob*>(data));
    }
 
    bool blobPubSubType::getKey(
            void* data,
            InstanceHandle_t* handle,
            bool force_md5)
    {
        if (!m_isGetKeyDefined)
        {
            return false;
        }
 
        blob* p_type = static_cast<blob*>(data);
 
        // Object that manages the raw buffer.
        eprosima::fastcdr::FastBuffer fastbuffer(reinterpret_cast<char*>(m_keyBuffer),
                blob::getKeyMaxCdrSerializedSize());
 
        // Object that serializes the data.
        eprosima::fastcdr::Cdr ser(fastbuffer, eprosima::fastcdr::Cdr::BIG_ENDIANNESS);
        p_type->serializeKey(ser);
        if (force_md5 || blob::getKeyMaxCdrSerializedSize() > 16)
        {
            m_md5.init();
            m_md5.update(m_keyBuffer, static_cast<unsigned int>(ser.getSerializedDataLength()));
            m_md5.finalize();
            for (uint8_t i = 0; i < 16; ++i)
            {
                handle->value[i] = m_md5.digest[i];
            }
        }
        else
        {
            for (uint8_t i = 0; i < 16; ++i)
            {
                handle->value[i] = m_keyBuffer[i];
            }
        }
        return true;
    }
 
 
} //End of namespace udds