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Zero-copy decode: span-based Envelope and DecodedMessage, defer usb_rx_buf clear

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This commit is contained in:
Ian Gulliver
2026-04-10 23:08:51 +09:00
parent 76c519c17a
commit 7264611f99
3 changed files with 12 additions and 7 deletions
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7
firmware/include/msgpack.h
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@@ -773,6 +773,13 @@ inline result<parser> unpack(const parser &p, std::vector<uint8_t> &out) {
return p.next();
}
inline result<parser> unpack(const parser &p, std::span<const uint8_t> &out) {
auto v = p.get_binary_view();
if (!v) return std::unexpected(v.error());
out = std::span<const uint8_t>(reinterpret_cast<const uint8_t*>(v->data()), v->size());
return p.next();
}
template <typename T>
requires (!std::is_same_v<T, uint8_t>)
result<parser> unpack(const parser &p, std::vector<T> &out) {

7
firmware/include/wire.h
View File

@@ -13,7 +13,7 @@ struct Envelope {
static constexpr int8_t ext_id = 0;
uint32_t message_id;
uint32_t checksum;
std::vector<uint8_t> payload;
std::span<const uint8_t> payload;
auto as_tuple() const { return std::tie(message_id, checksum, payload); }
auto as_tuple() { return std::tie(message_id, checksum, payload); }
};
@@ -94,7 +94,7 @@ static constexpr uint8_t hash_key[8] = {};
struct DecodedMessage {
uint32_t message_id;
int8_t type_id;
std::vector<uint8_t> payload;
std::span<const uint8_t> payload;
};
static constexpr size_t ext16_header_len = 4;
@@ -151,8 +151,7 @@ inline msgpack::result<DecodedMessage> try_decode(const uint8_t *data, size_t le
auto& [type_id, ext_data] = *ext;
return DecodedMessage{env.message_id, type_id,
std::vector<uint8_t>(reinterpret_cast<const uint8_t*>(ext_data.data()),
reinterpret_cast<const uint8_t*>(ext_data.data()) + ext_data.size())};
std::span<const uint8_t>(reinterpret_cast<const uint8_t*>(ext_data.data()), ext_data.size())};
}
template <size_t N>