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Overflow detection, span-based signatures, flatten control flow

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This commit is contained in:
Ian Gulliver
2026-04-10 23:02:07 +09:00
parent 8408603390
commit 76c519c17a
7 changed files with 67 additions and 56 deletions
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7
firmware/include/wire.h
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@@ -109,7 +109,7 @@ static constexpr size_t envelope_hdr_len =
static constexpr size_t response_prefix_len = envelope_hdr_len + ext16_header_len;
template <typename T>
inline size_t encode_response_into(span_writer &out, uint32_t message_id, const T &msg) {
inline msgpack::result<size_t> encode_response_into(span_writer &out, uint32_t message_id, const T &msg) {
auto body = out.subspan(response_prefix_len);
msgpack::packer body_p(body);
body_p.pack(msg.as_tuple());
@@ -129,6 +129,8 @@ inline size_t encode_response_into(span_writer &out, uint32_t message_id, const
hdr.pack_uint32_fixed(checksum);
hdr.pack_bin16_header(static_cast<uint16_t>(bin_len));
if (body.overflow() || inner_ext.overflow() || env_hdr.overflow())
return std::unexpected(msgpack::error_code::overflow);
return response_prefix_len + body.size();
}
@@ -176,6 +178,3 @@ inline msgpack::result<T> decode_response(const uint8_t *data, size_t len) {
return out;
}
inline size_t encode_request_into(span_writer &out, uint32_t message_id, const auto &msg) {
return encode_response_into(out, message_id, msg);
}