Method DoReadAt

cpp/src/arrow/io/memory.cc:323–332

}

Result<int64_t> BufferReader::DoReadAt(int64_t position, int64_t nbytes, void* buffer) {
  RETURN_NOT_OK(CheckClosed());

  ARROW_ASSIGN_OR_RAISE(nbytes, internal::ValidateReadRange(position, nbytes, size_));
  DCHECK_GE(nbytes, 0);
  if (nbytes) {
    memcpy(buffer, data_ + position, nbytes);
  }
  return nbytes;
}

Result<std::shared_ptr<Buffer>> BufferReader::DoReadAt(int64_t position, int64_t nbytes) {
  RETURN_NOT_OK(CheckClosed());