Take for example:

typedef struct SpiceQUICData {
    uint32_t data_size;
    SpiceChunks *data;
}

With the protocol description:

struct BinaryData {
    uint32 data_size;
    uint8 data[data_size] @nomarshal @chunk;
} @ctype(SpiceQUICData);

Since SpiceChunks* already contains the data size we should not need to store it separately in SpiceQUICData. However, this needs some work in the codegeneration to work.