[protobuf] Reading and writing multiple messages to a file

[rodrigo benenson]

Hello all !
I am trying to save multiple Protocol Buffer messages into a file and then 
reading them back.
All messages (except the first) have the same type.

My code now works. But I had to use a workaround instead. The code looks as 
follows.

    boost::uint64_t size;
    const bool read_size_success = 
input_coded_stream_p->ReadLittleEndian64(&size);

    bool read_data_success = false;

    const bool use_zero_copy_stream = false;
    if(use_zero_copy_stream)
    {
        read_data_success =
                    
data.ParseFromBoundedZeroCopyStream(input_stream_p.get(), 
static_cast<int>(size));
    }
    else
    { // work around
        std::string buffer;
        input_coded_stream_p->ReadString(&buffer, size);
        read_data_success = data.ParseFromString(buffer);
    }

    if (read_size_success == false or read_data_success == false)
    {
        throw std::runtime_error("Failed to read a data message during 
DataSequence<DataType>::read");
    }


The code above works fine when using  use_zero_copy_stream == false however 
when I set use_zero_copy_stream to true then the read fails (read_data_success 
== false).

Obviously input_coded_stream_p was constructed using input_stream_p.

Why is ParseFromBoundedZeroCopyStream not working as expected ? What is the 
proper way of using it ?

Thanks for your answers.
Best regards,
rodrigob.



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