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Zero-copy TX: span_writer packer, static buffers, no vector returns

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Ian Gulliver
2026-04-10 22:18:44 +09:00
parent 94895fd2fe
commit e2a5d97dae
10 changed files with 173 additions and 133 deletions
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32
firmware/include/wire.h
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@@ -1,6 +1,7 @@
#pragma once
#include <array>
#include <cstdint>
#include <span>
#include <string>
#include <tuple>
#include <vector>
@@ -96,18 +97,27 @@ struct DecodedMessage {
std::vector<uint8_t> payload;
};
inline std::vector<uint8_t> pack_envelope(uint32_t message_id, const std::vector<uint8_t> &payload) {
uint32_t checksum = halfsiphash::hash32(payload.data(), payload.size(), hash_key);
msgpack::packer p;
p.pack(Envelope{message_id, checksum, payload});
return p.get_payload();
inline size_t pack_envelope_into(span_writer &out, uint32_t message_id, const uint8_t *payload, size_t payload_len) {
uint32_t checksum = halfsiphash::hash32(payload, payload_len, hash_key);
uint8_t env_buf[512];
span_writer env_body(env_buf, sizeof(env_buf));
msgpack::packer env_p(env_body);
env_p.pack_array(3);
env_p.pack(message_id);
env_p.pack(checksum);
env_p.pack_bin(std::span<const uint8_t>{payload, payload_len});
msgpack::packer outer(out);
outer.pack_ext(Envelope::ext_id, env_body);
return out.size();
}
template <typename T>
inline std::vector<uint8_t> encode_response(uint32_t message_id, const T &msg) {
msgpack::packer inner;
inline size_t encode_response_into(span_writer &out, uint32_t message_id, const T &msg) {
uint8_t inner_buf[256];
msgpack::packer inner(inner_buf, sizeof(inner_buf));
inner.pack(msg);
return pack_envelope(message_id, inner.get_payload());
auto &pl = inner.get_payload();
return pack_envelope_into(out, message_id, pl.data(), pl.size());
}
inline msgpack::result<DecodedMessage> try_decode(const uint8_t *data, size_t len) {
@@ -154,8 +164,6 @@ inline msgpack::result<T> decode_response(const uint8_t *data, size_t len) {
return out;
}
inline std::vector<uint8_t> encode_request(uint32_t message_id, const auto &msg) {
msgpack::packer inner;
inner.pack(msg);
return pack_envelope(message_id, inner.get_payload());
inline size_t encode_request_into(span_writer &out, uint32_t message_id, const auto &msg) {
return encode_response_into(out, message_id, msg);
}