Function write_content

extern/include/cpp-httplib/httplib.h:3602–3635

template <typename T>
inline bool write_content(Stream &strm, const ContentProvider &content_provider,
                          size_t offset, size_t length, T is_shutting_down,
                          Error &error) {
  size_t end_offset = offset + length;
  auto ok = true;
  DataSink data_sink;

  data_sink.write = [&](const char *d, size_t l) -> bool {
    if (ok) {
      if (write_data(strm, d, l)) {
        offset += l;
      } else {
        ok = false;
      }
    }
    return ok;
  };

  data_sink.is_writable = [&](void) { return ok && strm.is_writable(); };

  while (offset < end_offset && !is_shutting_down()) {
    if (!content_provider(offset, end_offset - offset, data_sink)) {
      error = Error::Canceled;
      return false;
    }
    if (!ok) {
      error = Error::Write;
      return false;
    }
  }

  error = Error::Success;
  return true;
}

template <typename T>
inline bool write_content(Stream &strm, const ContentProvider &content_provider,