I am implementing a way to transfer a set of data to a programmable dongle. The dongle is based on a smart card technology and can execute an arbitrary code inside. The input and output data is passed as a binary blocks that can be accessed via input and output pointers.

I would like to use an associative array to simplify the data processing code. Everything should work this way:

First the host application:

    // Host application in C++
    in_data[&quot;method&quot;] = &quot;calc_r&quot;;
    in_data[&quot;id&quot;] = 12;
    in_data[&quot;loc_a&quot;] = 56.19;
    in_data[&quot;loc_l&quot;] = 44.02;
    processor-&gt;send(in_data);

Next the code inside the dongle:

    // Some dongle function in C
    char* method_name = assoc_get_string(in_data, &quot;method&quot;);
    int id = assoc_get_int(in_data, &quot;id&quot;);
    float loc_a = assoc_get_float(in_data, &quot;loc_a&quot;);
    float loc_l = assoc_get_float(in_data, &quot;loc_l&quot;);

So my question is about the dongle part functionality. Is there C code or library to implement such an associative array behavior like the above?

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Associative arrays in C