Class DecodedBuffer

cpp/QuickBase64Impl.cpp:15–24

Owns a decoded std::string. JSI holds the shared_ptr alive for the ArrayBuffer's lifetime — no memcpy needed.

// Owns a decoded std::string. JSI holds the shared_ptr alive for the
// ArrayBuffer's lifetime — no memcpy needed.
class DecodedBuffer final : public jsi::MutableBuffer {
public:
  explicit DecodedBuffer(std::string&& s) noexcept : data_(std::move(s)) {}
  size_t size() const override { return data_.size(); }
  uint8_t* data() override {
    return reinterpret_cast<uint8_t*>(data_.data());
  }
private:
  std::string data_;
};

// Mirrors V8's Uint8Array.fromBase64 (TC39-aligned):
// - last_chunk_handling_options::loose accepts inputs without '=' padding