Method Write

lib/mdflib/mdflib/src/cg4block.cpp:194–271

}

uint64_t Cg4Block::Write(std::streambuf& buffer) {
  const bool update = FilePosition() > 0;  // True if already written to file
  const auto master = (flags_ & CgFlag::RemoteMaster) != 0;
  const auto vlsd = (flags_ & CgFlag::VlsdChannel) != 0;
  if (!update) {
    block_type_ = "##CG";
    block_length_ = 24 + (6 * 8) + 8 + 8 + 2 + 2 + 4 + 4 + 4;
    if (master) {
      block_length_ += 8;  // Add one more link for master
    }
    link_list_.resize(master ? 7 : 6, 0);
  }


  WriteLink4List(buffer, cn_list_, kIndexCn,
                 UpdateOption::DoNotUpdateWrittenBlock);
  WriteTx4(buffer, kIndexName, acquisition_name_);
  WriteBlock4(buffer, si_block_, kIndexSi);
  WriteLink4List(buffer, sr_list_, kIndexSr,
                 UpdateOption::DoNotUpdateWrittenBlock);
  WriteMdComment(buffer, kIndexMd);
  // ToDo: Remote master handling

  uint64_t bytes = update ? MdfBlock::Update(buffer) : MdfBlock::Write(buffer);
  if (update) {
    // Update number of samples
    if (nof_samples_position_ > 0) {
      SetFilePosition(buffer, nof_samples_position_);
      WriteNumber(buffer, nof_samples_);
    }
    // Update VLSD size (which is a 64-bit value, low 32-bit)
    if (nof_data_position_ > 0) {
      SetFilePosition(buffer, nof_data_position_);
      WriteNumber(buffer, nof_data_bytes_);
    }
    // Update VLSD size (which is a 64-bit value, high 32-bit)
    if (nof_invalid_position_ > 0) {
      SetFilePosition(buffer, nof_invalid_position_);
      WriteNumber(buffer, nof_invalid_bytes_);
    }
    bytes = block_length_;
  } else {
    bytes += WriteNumber(buffer, record_id_);
    nof_samples_position_ = GetFilePosition(buffer);
    bytes += WriteNumber(buffer, nof_samples_);
    bytes += WriteNumber(buffer, flags_);
    bytes += WriteNumber(buffer, path_separator_);
    bytes += WriteBytes(buffer, 4);
    // Save the nof data and invalid bytes in case of a VLSD group.
    // Number data bytes is the lower 32-bit and number invalid bytes is the
    // 32-bit higher value.
    if (vlsd) {
      nof_data_position_ = GetFilePosition(buffer);
    }
    bytes += WriteNumber(buffer, nof_data_bytes_);
    if (vlsd) {
      nof_invalid_position_ = GetFilePosition(buffer);
    }