I am trying to implement a middle layer which serialises some data from a
data structure into a buffer, which is owned by and whose contents are
written on the wire by an outer layer.
Currently, my code looks as follows
----------------------------------------------------------------------------------------------------------------------------------------
constexpr size_t N = 2048;
char arena_buffer[N]{0};
auto arena = arrayPtr(reinterpret_cast<word*>(arena_buffer), N /
sizeof(word));
Encode (some_data_structure, arena, buffer)
{
auto builder = MallocMessageBuilder(arena);
....
// Step 1. set fields from some_data_structure using builder into arena
....
// Step 2. convert to flat array (this allocates another array)
auto message = messageToFlatArray(builder);
auto bytes = message.asBytes();
// Step 3. copy to destination
memcpy(buffer, bytes.begin(), bytes.size());
}
----------------------------------------------------------------------------------------------------------------------------------------
My question is, Can I do better?
My understanding is that the extra allocation in Step 2, is because of the
segment framing protocol ?
Can I bypass it somehow, as I am sure that the arena is big enough for my
message and there'll be only 1 segment ?
And if yes, then may be I can use the buffer as the arena, as in build
directly into the output buffer?
Thanks,
Jitesh
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