Method check_buffers

test/write_at.cpp:64–84

  template <typename Iterator>
  bool check_buffers(boost::asio::uint64_t offset,
      Iterator begin, Iterator end, size_t length)
  {
    if (offset + length > max_length)
      return false;

    Iterator iter = begin;
    size_t checked_length = 0;
    for (; iter != end && checked_length < length; ++iter)
    {
      size_t buffer_length = boost::asio::buffer_size(*iter);
      if (buffer_length > length - checked_length)
        buffer_length = length - checked_length;
      if (memcmp(data_ + offset + checked_length,
            iter->data(), buffer_length) != 0)
        return false;
      checked_length += buffer_length;
    }

    return true;
  }

  template <typename Const_Buffers>
  bool check_buffers(boost::asio::uint64_t offset,