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feat(ffi): scalar type mappings + seq[byte] byte-string codec (#99)

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This commit is contained in:
Gabriel Cruz
2026-06-25 17:16:21 -03:00
committed by GitHub
parent 7362bfd212
commit 64a332ca8b
8 changed files with 150 additions and 19 deletions
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examples/echo/cpp_bindings/echo.hpp
+22
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@@ -129,6 +129,14 @@ inline CborError encode_cbor(CborEncoder& e, const std::vector<T>& v) {
return cbor_encoder_close_container(&e, &arr);
}
// `seq[byte]` rides the wire as a CBOR byte string (major type 2), matching
// Nim's cbor_serialization. This non-template overload beats the std::vector<T>
// template in overload resolution, so std::vector<std::uint8_t> fields use it
// automatically.
inline CborError encode_cbor(CborEncoder& e, const std::vector<std::uint8_t>& v) {
return cbor_encode_byte_string(&e, v.data(), v.size());
}
template<typename T>
inline CborError encode_cbor(CborEncoder& e, const std::optional<T>& v) {
if (!v) return cbor_encode_null(&e);
@@ -206,6 +214,20 @@ inline CborError decode_cbor(CborValue& it, std::vector<T>& out) {
return cbor_value_leave_container(&it, &inner);
}
// Counterpart to the byte-string encoder above: decode a CBOR byte string
// (major type 2) back into std::vector<std::uint8_t>.
inline CborError decode_cbor(CborValue& it, std::vector<std::uint8_t>& out) {
if (!cbor_value_is_byte_string(&it)) return CborErrorImproperValue;
size_t len = 0;
CborError err = cbor_value_get_string_length(&it, &len);
if (err) return err;
out.resize(len);
err = cbor_value_copy_byte_string(
&it, out.empty() ? nullptr : out.data(), &len, nullptr);
if (err) return err;
return cbor_value_advance(&it);
}
template<typename T>
inline CborError decode_cbor(CborValue& it, std::optional<T>& out) {
if (cbor_value_is_null(&it)) {